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code.illumos.org / illumos-gate / ab618543cc6fc4bc273c077ef5d247961cdb29d4 / . / usr / src / uts / common / sys / dtrace.h
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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright 2018 Joyent, Inc.
* Copyright (c) 2013 by Delphix. All rights reserved.
*/
#ifndef _SYS_DTRACE_H
#define _SYS_DTRACE_H
#ifdef __cplusplus
extern "C" {
#endif
/*
* DTrace Dynamic Tracing Software: Kernel Interfaces
*
* Note: The contents of this file are private to the implementation of the
* Solaris system and DTrace subsystem and are subject to change at any time
* without notice. Applications and drivers using these interfaces will fail
* to run on future releases. These interfaces should not be used for any
* purpose except those expressly outlined in dtrace(7D) and libdtrace(3LIB).
* Please refer to the "Solaris Dynamic Tracing Guide" for more information.
*/
#ifndef _ASM
#include <sys/types.h>
#include <sys/modctl.h>
#include <sys/processor.h>
#include <sys/systm.h>
#include <sys/ctf_api.h>
#include <sys/cyclic.h>
#include <sys/int_limits.h>
/*
* DTrace Universal Constants and Typedefs
*/
#define DTRACE_CPUALL -1 /* all CPUs */
#define DTRACE_IDNONE 0 /* invalid probe identifier */
#define DTRACE_EPIDNONE 0 /* invalid enabled probe identifier */
#define DTRACE_AGGIDNONE 0 /* invalid aggregation identifier */
#define DTRACE_AGGVARIDNONE 0 /* invalid aggregation variable ID */
#define DTRACE_CACHEIDNONE 0 /* invalid predicate cache */
#define DTRACE_PROVNONE 0 /* invalid provider identifier */
#define DTRACE_METAPROVNONE 0 /* invalid meta-provider identifier */
#define DTRACE_ARGNONE -1 /* invalid argument index */
#define DTRACE_PROVNAMELEN 64
#define DTRACE_MODNAMELEN 64
#define DTRACE_FUNCNAMELEN 128
#define DTRACE_NAMELEN 64
#define DTRACE_FULLNAMELEN (DTRACE_PROVNAMELEN + DTRACE_MODNAMELEN + \
DTRACE_FUNCNAMELEN + DTRACE_NAMELEN + 4)
#define DTRACE_ARGTYPELEN 128
typedef uint32_t dtrace_id_t; /* probe identifier */
typedef uint32_t dtrace_epid_t; /* enabled probe identifier */
typedef uint32_t dtrace_aggid_t; /* aggregation identifier */
typedef int64_t dtrace_aggvarid_t; /* aggregation variable identifier */
typedef uint16_t dtrace_actkind_t; /* action kind */
typedef int64_t dtrace_optval_t; /* option value */
typedef uint32_t dtrace_cacheid_t; /* predicate cache identifier */
typedef enum dtrace_probespec {
DTRACE_PROBESPEC_NONE = -1,
DTRACE_PROBESPEC_PROVIDER = 0,
DTRACE_PROBESPEC_MOD,
DTRACE_PROBESPEC_FUNC,
DTRACE_PROBESPEC_NAME
} dtrace_probespec_t;
/*
* DTrace Intermediate Format (DIF)
*
* The following definitions describe the DTrace Intermediate Format (DIF), a
* a RISC-like instruction set and program encoding used to represent
* predicates and actions that can be bound to DTrace probes. The constants
* below defining the number of available registers are suggested minimums; the
* compiler should use DTRACEIOC_CONF to dynamically obtain the number of
* registers provided by the current DTrace implementation.
*/
#define DIF_VERSION_1 1 /* DIF version 1: Solaris 10 Beta */
#define DIF_VERSION_2 2 /* DIF version 2: Solaris 10 FCS */
#define DIF_VERSION DIF_VERSION_2 /* latest DIF instruction set version */
#define DIF_DIR_NREGS 8 /* number of DIF integer registers */
#define DIF_DTR_NREGS 8 /* number of DIF tuple registers */
#define DIF_OP_OR 1 /* or r1, r2, rd */
#define DIF_OP_XOR 2 /* xor r1, r2, rd */
#define DIF_OP_AND 3 /* and r1, r2, rd */
#define DIF_OP_SLL 4 /* sll r1, r2, rd */
#define DIF_OP_SRL 5 /* srl r1, r2, rd */
#define DIF_OP_SUB 6 /* sub r1, r2, rd */
#define DIF_OP_ADD 7 /* add r1, r2, rd */
#define DIF_OP_MUL 8 /* mul r1, r2, rd */
#define DIF_OP_SDIV 9 /* sdiv r1, r2, rd */
#define DIF_OP_UDIV 10 /* udiv r1, r2, rd */
#define DIF_OP_SREM 11 /* srem r1, r2, rd */
#define DIF_OP_UREM 12 /* urem r1, r2, rd */
#define DIF_OP_NOT 13 /* not r1, rd */
#define DIF_OP_MOV 14 /* mov r1, rd */
#define DIF_OP_CMP 15 /* cmp r1, r2 */
#define DIF_OP_TST 16 /* tst r1 */
#define DIF_OP_BA 17 /* ba label */
#define DIF_OP_BE 18 /* be label */
#define DIF_OP_BNE 19 /* bne label */
#define DIF_OP_BG 20 /* bg label */
#define DIF_OP_BGU 21 /* bgu label */
#define DIF_OP_BGE 22 /* bge label */
#define DIF_OP_BGEU 23 /* bgeu label */
#define DIF_OP_BL 24 /* bl label */
#define DIF_OP_BLU 25 /* blu label */
#define DIF_OP_BLE 26 /* ble label */
#define DIF_OP_BLEU 27 /* bleu label */
#define DIF_OP_LDSB 28 /* ldsb [r1], rd */
#define DIF_OP_LDSH 29 /* ldsh [r1], rd */
#define DIF_OP_LDSW 30 /* ldsw [r1], rd */
#define DIF_OP_LDUB 31 /* ldub [r1], rd */
#define DIF_OP_LDUH 32 /* lduh [r1], rd */
#define DIF_OP_LDUW 33 /* lduw [r1], rd */
#define DIF_OP_LDX 34 /* ldx [r1], rd */
#define DIF_OP_RET 35 /* ret rd */
#define DIF_OP_NOP 36 /* nop */
#define DIF_OP_SETX 37 /* setx intindex, rd */
#define DIF_OP_SETS 38 /* sets strindex, rd */
#define DIF_OP_SCMP 39 /* scmp r1, r2 */
#define DIF_OP_LDGA 40 /* ldga var, ri, rd */
#define DIF_OP_LDGS 41 /* ldgs var, rd */
#define DIF_OP_STGS 42 /* stgs var, rs */
#define DIF_OP_LDTA 43 /* ldta var, ri, rd */
#define DIF_OP_LDTS 44 /* ldts var, rd */
#define DIF_OP_STTS 45 /* stts var, rs */
#define DIF_OP_SRA 46 /* sra r1, r2, rd */
#define DIF_OP_CALL 47 /* call subr, rd */
#define DIF_OP_PUSHTR 48 /* pushtr type, rs, rr */
#define DIF_OP_PUSHTV 49 /* pushtv type, rs, rv */
#define DIF_OP_POPTS 50 /* popts */
#define DIF_OP_FLUSHTS 51 /* flushts */
#define DIF_OP_LDGAA 52 /* ldgaa var, rd */
#define DIF_OP_LDTAA 53 /* ldtaa var, rd */
#define DIF_OP_STGAA 54 /* stgaa var, rs */
#define DIF_OP_STTAA 55 /* sttaa var, rs */
#define DIF_OP_LDLS 56 /* ldls var, rd */
#define DIF_OP_STLS 57 /* stls var, rs */
#define DIF_OP_ALLOCS 58 /* allocs r1, rd */
#define DIF_OP_COPYS 59 /* copys r1, r2, rd */
#define DIF_OP_STB 60 /* stb r1, [rd] */
#define DIF_OP_STH 61 /* sth r1, [rd] */
#define DIF_OP_STW 62 /* stw r1, [rd] */
#define DIF_OP_STX 63 /* stx r1, [rd] */
#define DIF_OP_ULDSB 64 /* uldsb [r1], rd */
#define DIF_OP_ULDSH 65 /* uldsh [r1], rd */
#define DIF_OP_ULDSW 66 /* uldsw [r1], rd */
#define DIF_OP_ULDUB 67 /* uldub [r1], rd */
#define DIF_OP_ULDUH 68 /* ulduh [r1], rd */
#define DIF_OP_ULDUW 69 /* ulduw [r1], rd */
#define DIF_OP_ULDX 70 /* uldx [r1], rd */
#define DIF_OP_RLDSB 71 /* rldsb [r1], rd */
#define DIF_OP_RLDSH 72 /* rldsh [r1], rd */
#define DIF_OP_RLDSW 73 /* rldsw [r1], rd */
#define DIF_OP_RLDUB 74 /* rldub [r1], rd */
#define DIF_OP_RLDUH 75 /* rlduh [r1], rd */
#define DIF_OP_RLDUW 76 /* rlduw [r1], rd */
#define DIF_OP_RLDX 77 /* rldx [r1], rd */
#define DIF_OP_XLATE 78 /* xlate xlrindex, rd */
#define DIF_OP_XLARG 79 /* xlarg xlrindex, rd */
#define DIF_OP_STGA 80 /* stga var, ri, rd */
#define DIF_INTOFF_MAX 0xffff /* highest integer table offset */
#define DIF_STROFF_MAX 0xffff /* highest string table offset */
#define DIF_REGISTER_MAX 0xff /* highest register number */
#define DIF_VARIABLE_MAX 0xffff /* highest variable identifier */
#define DIF_SUBROUTINE_MAX 0xffff /* highest subroutine code */
#define DIF_VAR_ARRAY_MIN 0x0000 /* lowest numbered array variable */
#define DIF_VAR_ARRAY_UBASE 0x0080 /* lowest user-defined array */
#define DIF_VAR_ARRAY_MAX 0x00ff /* highest numbered array variable */
#define DIF_VAR_OTHER_MIN 0x0100 /* lowest numbered scalar or assc */
#define DIF_VAR_OTHER_UBASE 0x0500 /* lowest user-defined scalar or assc */
#define DIF_VAR_OTHER_MAX 0xffff /* highest numbered scalar or assc */
#define DIF_VAR_ARGS 0x0000 /* arguments array */
#define DIF_VAR_REGS 0x0001 /* registers array */
#define DIF_VAR_UREGS 0x0002 /* user registers array */
#define DIF_VAR_VMREGS 0x0003 /* virtual machine registers array */
#define DIF_VAR_CURTHREAD 0x0100 /* thread pointer */
#define DIF_VAR_TIMESTAMP 0x0101 /* timestamp */
#define DIF_VAR_VTIMESTAMP 0x0102 /* virtual timestamp */
#define DIF_VAR_IPL 0x0103 /* interrupt priority level */
#define DIF_VAR_EPID 0x0104 /* enabled probe ID */
#define DIF_VAR_ID 0x0105 /* probe ID */
#define DIF_VAR_ARG0 0x0106 /* first argument */
#define DIF_VAR_ARG1 0x0107 /* second argument */
#define DIF_VAR_ARG2 0x0108 /* third argument */
#define DIF_VAR_ARG3 0x0109 /* fourth argument */
#define DIF_VAR_ARG4 0x010a /* fifth argument */
#define DIF_VAR_ARG5 0x010b /* sixth argument */
#define DIF_VAR_ARG6 0x010c /* seventh argument */
#define DIF_VAR_ARG7 0x010d /* eighth argument */
#define DIF_VAR_ARG8 0x010e /* ninth argument */
#define DIF_VAR_ARG9 0x010f /* tenth argument */
#define DIF_VAR_STACKDEPTH 0x0110 /* stack depth */
#define DIF_VAR_CALLER 0x0111 /* caller */
#define DIF_VAR_PROBEPROV 0x0112 /* probe provider */
#define DIF_VAR_PROBEMOD 0x0113 /* probe module */
#define DIF_VAR_PROBEFUNC 0x0114 /* probe function */
#define DIF_VAR_PROBENAME 0x0115 /* probe name */
#define DIF_VAR_PID 0x0116 /* process ID */
#define DIF_VAR_TID 0x0117 /* (per-process) thread ID */
#define DIF_VAR_EXECNAME 0x0118 /* name of executable */
#define DIF_VAR_ZONENAME 0x0119 /* zone name associated with process */
#define DIF_VAR_WALLTIMESTAMP 0x011a /* wall-clock timestamp */
#define DIF_VAR_USTACKDEPTH 0x011b /* user-land stack depth */
#define DIF_VAR_UCALLER 0x011c /* user-level caller */
#define DIF_VAR_PPID 0x011d /* parent process ID */
#define DIF_VAR_UID 0x011e /* process user ID */
#define DIF_VAR_GID 0x011f /* process group ID */
#define DIF_VAR_ERRNO 0x0120 /* thread errno */
#define DIF_VAR_THREADNAME 0x0121 /* thread name */
#define DIF_SUBR_RAND 0
#define DIF_SUBR_MUTEX_OWNED 1
#define DIF_SUBR_MUTEX_OWNER 2
#define DIF_SUBR_MUTEX_TYPE_ADAPTIVE 3
#define DIF_SUBR_MUTEX_TYPE_SPIN 4
#define DIF_SUBR_RW_READ_HELD 5
#define DIF_SUBR_RW_WRITE_HELD 6
#define DIF_SUBR_RW_ISWRITER 7
#define DIF_SUBR_COPYIN 8
#define DIF_SUBR_COPYINSTR 9
#define DIF_SUBR_SPECULATION 10
#define DIF_SUBR_PROGENYOF 11
#define DIF_SUBR_STRLEN 12
#define DIF_SUBR_COPYOUT 13
#define DIF_SUBR_COPYOUTSTR 14
#define DIF_SUBR_ALLOCA 15
#define DIF_SUBR_BCOPY 16
#define DIF_SUBR_COPYINTO 17
#define DIF_SUBR_MSGDSIZE 18
#define DIF_SUBR_MSGSIZE 19
#define DIF_SUBR_GETMAJOR 20
#define DIF_SUBR_GETMINOR 21
#define DIF_SUBR_DDI_PATHNAME 22
#define DIF_SUBR_STRJOIN 23
#define DIF_SUBR_LLTOSTR 24
#define DIF_SUBR_BASENAME 25
#define DIF_SUBR_DIRNAME 26
#define DIF_SUBR_CLEANPATH 27
#define DIF_SUBR_STRCHR 28
#define DIF_SUBR_STRRCHR 29
#define DIF_SUBR_STRSTR 30
#define DIF_SUBR_STRTOK 31
#define DIF_SUBR_SUBSTR 32
#define DIF_SUBR_INDEX 33
#define DIF_SUBR_RINDEX 34
#define DIF_SUBR_HTONS 35
#define DIF_SUBR_HTONL 36
#define DIF_SUBR_HTONLL 37
#define DIF_SUBR_NTOHS 38
#define DIF_SUBR_NTOHL 39
#define DIF_SUBR_NTOHLL 40
#define DIF_SUBR_INET_NTOP 41
#define DIF_SUBR_INET_NTOA 42
#define DIF_SUBR_INET_NTOA6 43
#define DIF_SUBR_TOUPPER 44
#define DIF_SUBR_TOLOWER 45
#define DIF_SUBR_GETF 46
#define DIF_SUBR_JSON 47
#define DIF_SUBR_STRTOLL 48
#define DIF_SUBR_MAX 48 /* max subroutine value */
typedef uint32_t dif_instr_t;
#define DIF_INSTR_OP(i) (((i) >> 24) & 0xff)
#define DIF_INSTR_R1(i) (((i) >> 16) & 0xff)
#define DIF_INSTR_R2(i) (((i) >> 8) & 0xff)
#define DIF_INSTR_RD(i) ((i) & 0xff)
#define DIF_INSTR_RS(i) ((i) & 0xff)
#define DIF_INSTR_LABEL(i) ((i) & 0xffffff)
#define DIF_INSTR_VAR(i) (((i) >> 8) & 0xffff)
#define DIF_INSTR_INTEGER(i) (((i) >> 8) & 0xffff)
#define DIF_INSTR_STRING(i) (((i) >> 8) & 0xffff)
#define DIF_INSTR_SUBR(i) (((i) >> 8) & 0xffff)
#define DIF_INSTR_TYPE(i) (((i) >> 16) & 0xff)
#define DIF_INSTR_XLREF(i) (((i) >> 8) & 0xffff)
#define DIF_INSTR_FMT(op, r1, r2, d) \
(((op) << 24) | ((r1) << 16) | ((r2) << 8) | (d))
#define DIF_INSTR_NOT(r1, d) (DIF_INSTR_FMT(DIF_OP_NOT, r1, 0, d))
#define DIF_INSTR_MOV(r1, d) (DIF_INSTR_FMT(DIF_OP_MOV, r1, 0, d))
#define DIF_INSTR_CMP(op, r1, r2) (DIF_INSTR_FMT(op, r1, r2, 0))
#define DIF_INSTR_TST(r1) (DIF_INSTR_FMT(DIF_OP_TST, r1, 0, 0))
#define DIF_INSTR_BRANCH(op, label) (((op) << 24) | (label))
#define DIF_INSTR_LOAD(op, r1, d) (DIF_INSTR_FMT(op, r1, 0, d))
#define DIF_INSTR_STORE(op, r1, d) (DIF_INSTR_FMT(op, r1, 0, d))
#define DIF_INSTR_SETX(i, d) ((DIF_OP_SETX << 24) | ((i) << 8) | (d))
#define DIF_INSTR_SETS(s, d) ((DIF_OP_SETS << 24) | ((s) << 8) | (d))
#define DIF_INSTR_RET(d) (DIF_INSTR_FMT(DIF_OP_RET, 0, 0, d))
#define DIF_INSTR_NOP (DIF_OP_NOP << 24)
#define DIF_INSTR_LDA(op, v, r, d) (DIF_INSTR_FMT(op, v, r, d))
#define DIF_INSTR_LDV(op, v, d) (((op) << 24) | ((v) << 8) | (d))
#define DIF_INSTR_STV(op, v, rs) (((op) << 24) | ((v) << 8) | (rs))
#define DIF_INSTR_CALL(s, d) ((DIF_OP_CALL << 24) | ((s) << 8) | (d))
#define DIF_INSTR_PUSHTS(op, t, r2, rs) (DIF_INSTR_FMT(op, t, r2, rs))
#define DIF_INSTR_POPTS (DIF_OP_POPTS << 24)
#define DIF_INSTR_FLUSHTS (DIF_OP_FLUSHTS << 24)
#define DIF_INSTR_ALLOCS(r1, d) (DIF_INSTR_FMT(DIF_OP_ALLOCS, r1, 0, d))
#define DIF_INSTR_COPYS(r1, r2, d) (DIF_INSTR_FMT(DIF_OP_COPYS, r1, r2, d))
#define DIF_INSTR_XLATE(op, r, d) (((op) << 24) | ((r) << 8) | (d))
#define DIF_REG_R0 0 /* %r0 is always set to zero */
/*
* A DTrace Intermediate Format Type (DIF Type) is used to represent the types
* of variables, function and associative array arguments, and the return type
* for each DIF object (shown below). It contains a description of the type,
* its size in bytes, and a module identifier.
*/
typedef struct dtrace_diftype {
uint8_t dtdt_kind; /* type kind (see below) */
uint8_t dtdt_ckind; /* type kind in CTF */
uint8_t dtdt_flags; /* type flags (see below) */
uint8_t dtdt_pad; /* reserved for future use */
uint32_t dtdt_size; /* type size in bytes (unless string) */
} dtrace_diftype_t;
#define DIF_TYPE_CTF 0 /* type is a CTF type */
#define DIF_TYPE_STRING 1 /* type is a D string */
#define DIF_TF_BYREF 0x1 /* type is passed by reference */
#define DIF_TF_BYUREF 0x2 /* user type is passed by reference */
/*
* A DTrace Intermediate Format variable record is used to describe each of the
* variables referenced by a given DIF object. It contains an integer variable
* identifier along with variable scope and properties, as shown below. The
* size of this structure must be sizeof (int) aligned.
*/
typedef struct dtrace_difv {
uint32_t dtdv_name; /* variable name index in dtdo_strtab */
uint32_t dtdv_id; /* variable reference identifier */
uint8_t dtdv_kind; /* variable kind (see below) */
uint8_t dtdv_scope; /* variable scope (see below) */
uint16_t dtdv_flags; /* variable flags (see below) */
dtrace_diftype_t dtdv_type; /* variable type (see above) */
} dtrace_difv_t;
#define DIFV_KIND_ARRAY 0 /* variable is an array of quantities */
#define DIFV_KIND_SCALAR 1 /* variable is a scalar quantity */
#define DIFV_SCOPE_GLOBAL 0 /* variable has global scope */
#define DIFV_SCOPE_THREAD 1 /* variable has thread scope */
#define DIFV_SCOPE_LOCAL 2 /* variable has local scope */
#define DIFV_F_REF 0x1 /* variable is referenced by DIFO */
#define DIFV_F_MOD 0x2 /* variable is written by DIFO */
/*
* DTrace Actions
*
* The upper byte determines the class of the action; the low bytes determines
* the specific action within that class. The classes of actions are as
* follows:
*
* [ no class ] <= May record process- or kernel-related data
* DTRACEACT_PROC <= Only records process-related data
* DTRACEACT_PROC_DESTRUCTIVE <= Potentially destructive to processes
* DTRACEACT_KERNEL <= Only records kernel-related data
* DTRACEACT_KERNEL_DESTRUCTIVE <= Potentially destructive to the kernel
* DTRACEACT_SPECULATIVE <= Speculation-related action
* DTRACEACT_AGGREGATION <= Aggregating action
*/
#define DTRACEACT_NONE 0 /* no action */
#define DTRACEACT_DIFEXPR 1 /* action is DIF expression */
#define DTRACEACT_EXIT 2 /* exit() action */
#define DTRACEACT_PRINTF 3 /* printf() action */
#define DTRACEACT_PRINTA 4 /* printa() action */
#define DTRACEACT_LIBACT 5 /* library-controlled action */
#define DTRACEACT_TRACEMEM 6 /* tracemem() action */
#define DTRACEACT_TRACEMEM_DYNSIZE 7 /* dynamic tracemem() size */
#define DTRACEACT_PROC 0x0100
#define DTRACEACT_USTACK (DTRACEACT_PROC + 1)
#define DTRACEACT_JSTACK (DTRACEACT_PROC + 2)
#define DTRACEACT_USYM (DTRACEACT_PROC + 3)
#define DTRACEACT_UMOD (DTRACEACT_PROC + 4)
#define DTRACEACT_UADDR (DTRACEACT_PROC + 5)
#define DTRACEACT_PROC_DESTRUCTIVE 0x0200
#define DTRACEACT_STOP (DTRACEACT_PROC_DESTRUCTIVE + 1)
#define DTRACEACT_RAISE (DTRACEACT_PROC_DESTRUCTIVE + 2)
#define DTRACEACT_SYSTEM (DTRACEACT_PROC_DESTRUCTIVE + 3)
#define DTRACEACT_FREOPEN (DTRACEACT_PROC_DESTRUCTIVE + 4)
#define DTRACEACT_PROC_CONTROL 0x0300
#define DTRACEACT_KERNEL 0x0400
#define DTRACEACT_STACK (DTRACEACT_KERNEL + 1)
#define DTRACEACT_SYM (DTRACEACT_KERNEL + 2)
#define DTRACEACT_MOD (DTRACEACT_KERNEL + 3)
#define DTRACEACT_KERNEL_DESTRUCTIVE 0x0500
#define DTRACEACT_BREAKPOINT (DTRACEACT_KERNEL_DESTRUCTIVE + 1)
#define DTRACEACT_PANIC (DTRACEACT_KERNEL_DESTRUCTIVE + 2)
#define DTRACEACT_CHILL (DTRACEACT_KERNEL_DESTRUCTIVE + 3)
#define DTRACEACT_SPECULATIVE 0x0600
#define DTRACEACT_SPECULATE (DTRACEACT_SPECULATIVE + 1)
#define DTRACEACT_COMMIT (DTRACEACT_SPECULATIVE + 2)
#define DTRACEACT_DISCARD (DTRACEACT_SPECULATIVE + 3)
#define DTRACEACT_CLASS(x) ((x) & 0xff00)
#define DTRACEACT_ISDESTRUCTIVE(x) \
(DTRACEACT_CLASS(x) == DTRACEACT_PROC_DESTRUCTIVE || \
DTRACEACT_CLASS(x) == DTRACEACT_KERNEL_DESTRUCTIVE)
#define DTRACEACT_ISSPECULATIVE(x) \
(DTRACEACT_CLASS(x) == DTRACEACT_SPECULATIVE)
#define DTRACEACT_ISPRINTFLIKE(x) \
((x) == DTRACEACT_PRINTF || (x) == DTRACEACT_PRINTA || \
(x) == DTRACEACT_SYSTEM || (x) == DTRACEACT_FREOPEN)
/*
* DTrace Aggregating Actions
*
* These are functions f(x) for which the following is true:
*
* f(f(x_0) U f(x_1) U ... U f(x_n)) = f(x_0 U x_1 U ... U x_n)
*
* where x_n is a set of arbitrary data. Aggregating actions are in their own
* DTrace action class, DTTRACEACT_AGGREGATION. The macros provided here allow
* for easier processing of the aggregation argument and data payload for a few
* aggregating actions (notably: quantize(), lquantize(), and ustack()).
*/
#define DTRACEACT_AGGREGATION 0x0700
#define DTRACEAGG_COUNT (DTRACEACT_AGGREGATION + 1)
#define DTRACEAGG_MIN (DTRACEACT_AGGREGATION + 2)
#define DTRACEAGG_MAX (DTRACEACT_AGGREGATION + 3)
#define DTRACEAGG_AVG (DTRACEACT_AGGREGATION + 4)
#define DTRACEAGG_SUM (DTRACEACT_AGGREGATION + 5)
#define DTRACEAGG_STDDEV (DTRACEACT_AGGREGATION + 6)
#define DTRACEAGG_QUANTIZE (DTRACEACT_AGGREGATION + 7)
#define DTRACEAGG_LQUANTIZE (DTRACEACT_AGGREGATION + 8)
#define DTRACEAGG_LLQUANTIZE (DTRACEACT_AGGREGATION + 9)
#define DTRACEACT_ISAGG(x) \
(DTRACEACT_CLASS(x) == DTRACEACT_AGGREGATION)
#define DTRACE_QUANTIZE_NBUCKETS \
(((sizeof (uint64_t) * NBBY) - 1) * 2 + 1)
#define DTRACE_QUANTIZE_ZEROBUCKET ((sizeof (uint64_t) * NBBY) - 1)
#define DTRACE_QUANTIZE_BUCKETVAL(buck) \
(int64_t)((buck) < DTRACE_QUANTIZE_ZEROBUCKET ? \
-(1LL << (DTRACE_QUANTIZE_ZEROBUCKET - 1 - (buck))) : \
(buck) == DTRACE_QUANTIZE_ZEROBUCKET ? 0 : \
1LL << ((buck) - DTRACE_QUANTIZE_ZEROBUCKET - 1))
#define DTRACE_LQUANTIZE_STEPSHIFT 48
#define DTRACE_LQUANTIZE_STEPMASK ((uint64_t)UINT16_MAX << 48)
#define DTRACE_LQUANTIZE_LEVELSHIFT 32
#define DTRACE_LQUANTIZE_LEVELMASK ((uint64_t)UINT16_MAX << 32)
#define DTRACE_LQUANTIZE_BASESHIFT 0
#define DTRACE_LQUANTIZE_BASEMASK UINT32_MAX
#define DTRACE_LQUANTIZE_STEP(x) \
(uint16_t)(((x) & DTRACE_LQUANTIZE_STEPMASK) >> \
DTRACE_LQUANTIZE_STEPSHIFT)
#define DTRACE_LQUANTIZE_LEVELS(x) \
(uint16_t)(((x) & DTRACE_LQUANTIZE_LEVELMASK) >> \
DTRACE_LQUANTIZE_LEVELSHIFT)
#define DTRACE_LQUANTIZE_BASE(x) \
(int32_t)(((x) & DTRACE_LQUANTIZE_BASEMASK) >> \
DTRACE_LQUANTIZE_BASESHIFT)
#define DTRACE_LLQUANTIZE_FACTORSHIFT 48
#define DTRACE_LLQUANTIZE_FACTORMASK ((uint64_t)UINT16_MAX << 48)
#define DTRACE_LLQUANTIZE_LOWSHIFT 32
#define DTRACE_LLQUANTIZE_LOWMASK ((uint64_t)UINT16_MAX << 32)
#define DTRACE_LLQUANTIZE_HIGHSHIFT 16
#define DTRACE_LLQUANTIZE_HIGHMASK ((uint64_t)UINT16_MAX << 16)
#define DTRACE_LLQUANTIZE_NSTEPSHIFT 0
#define DTRACE_LLQUANTIZE_NSTEPMASK UINT16_MAX
#define DTRACE_LLQUANTIZE_FACTOR(x) \
(uint16_t)(((x) & DTRACE_LLQUANTIZE_FACTORMASK) >> \
DTRACE_LLQUANTIZE_FACTORSHIFT)
#define DTRACE_LLQUANTIZE_LOW(x) \
(uint16_t)(((x) & DTRACE_LLQUANTIZE_LOWMASK) >> \
DTRACE_LLQUANTIZE_LOWSHIFT)
#define DTRACE_LLQUANTIZE_HIGH(x) \
(uint16_t)(((x) & DTRACE_LLQUANTIZE_HIGHMASK) >> \
DTRACE_LLQUANTIZE_HIGHSHIFT)
#define DTRACE_LLQUANTIZE_NSTEP(x) \
(uint16_t)(((x) & DTRACE_LLQUANTIZE_NSTEPMASK) >> \
DTRACE_LLQUANTIZE_NSTEPSHIFT)
#define DTRACE_USTACK_NFRAMES(x) (uint32_t)((x) & UINT32_MAX)
#define DTRACE_USTACK_STRSIZE(x) (uint32_t)((x) >> 32)
#define DTRACE_USTACK_ARG(x, y) \
((((uint64_t)(y)) << 32) | ((x) & UINT32_MAX))
#ifndef _LP64
#ifndef _LITTLE_ENDIAN
#define DTRACE_PTR(type, name) uint32_t name##pad; type *name
#else
#define DTRACE_PTR(type, name) type *name; uint32_t name##pad
#endif
#else
#define DTRACE_PTR(type, name) type *name
#endif
/*
* DTrace Object Format (DOF)
*
* DTrace programs can be persistently encoded in the DOF format so that they
* may be embedded in other programs (for example, in an ELF file) or in the
* dtrace driver configuration file for use in anonymous tracing. The DOF
* format is versioned and extensible so that it can be revised and so that
* internal data structures can be modified or extended compatibly. All DOF
* structures use fixed-size types, so the 32-bit and 64-bit representations
* are identical and consumers can use either data model transparently.
*
* The file layout is structured as follows:
*
* +---------------+-------------------+----- ... ----+---- ... ------+
* | dof_hdr_t | dof_sec_t[ ... ] | loadable | non-loadable |
* | (file header) | (section headers) | section data | section data |
* +---------------+-------------------+----- ... ----+---- ... ------+
* |<------------ dof_hdr.dofh_loadsz --------------->| |
* |<------------ dof_hdr.dofh_filesz ------------------------------->|
*
* The file header stores meta-data including a magic number, data model for
* the instrumentation, data encoding, and properties of the DIF code within.
* The header describes its own size and the size of the section headers. By
* convention, an array of section headers follows the file header, and then
* the data for all loadable sections and unloadable sections. This permits
* consumer code to easily download the headers and all loadable data into the
* DTrace driver in one contiguous chunk, omitting other extraneous sections.
*
* The section headers describe the size, offset, alignment, and section type
* for each section. Sections are described using a set of #defines that tell
* the consumer what kind of data is expected. Sections can contain links to
* other sections by storing a dof_secidx_t, an index into the section header
* array, inside of the section data structures. The section header includes
* an entry size so that sections with data arrays can grow their structures.
*
* The DOF data itself can contain many snippets of DIF (i.e. >1 DIFOs), which
* are represented themselves as a collection of related DOF sections. This
* permits us to change the set of sections associated with a DIFO over time,
* and also permits us to encode DIFOs that contain different sets of sections.
* When a DOF section wants to refer to a DIFO, it stores the dof_secidx_t of a
* section of type DOF_SECT_DIFOHDR. This section's data is then an array of
* dof_secidx_t's which in turn denote the sections associated with this DIFO.
*
* This loose coupling of the file structure (header and sections) to the
* structure of the DTrace program itself (ECB descriptions, action
* descriptions, and DIFOs) permits activities such as relocation processing
* to occur in a single pass without having to understand D program structure.
*
* Finally, strings are always stored in ELF-style string tables along with a
* string table section index and string table offset. Therefore strings in
* DOF are always arbitrary-length and not bound to the current implementation.
*/
#define DOF_ID_SIZE 16 /* total size of dofh_ident[] in bytes */
typedef struct dof_hdr {
uint8_t dofh_ident[DOF_ID_SIZE]; /* identification bytes (see below) */
uint32_t dofh_flags; /* file attribute flags (if any) */
uint32_t dofh_hdrsize; /* size of file header in bytes */
uint32_t dofh_secsize; /* size of section header in bytes */
uint32_t dofh_secnum; /* number of section headers */
uint64_t dofh_secoff; /* file offset of section headers */
uint64_t dofh_loadsz; /* file size of loadable portion */
uint64_t dofh_filesz; /* file size of entire DOF file */
uint64_t dofh_pad; /* reserved for future use */
} dof_hdr_t;
#define DOF_ID_MAG0 0 /* first byte of magic number */
#define DOF_ID_MAG1 1 /* second byte of magic number */
#define DOF_ID_MAG2 2 /* third byte of magic number */
#define DOF_ID_MAG3 3 /* fourth byte of magic number */
#define DOF_ID_MODEL 4 /* DOF data model (see below) */
#define DOF_ID_ENCODING 5 /* DOF data encoding (see below) */
#define DOF_ID_VERSION 6 /* DOF file format major version (see below) */
#define DOF_ID_DIFVERS 7 /* DIF instruction set version */
#define DOF_ID_DIFIREG 8 /* DIF integer registers used by compiler */
#define DOF_ID_DIFTREG 9 /* DIF tuple registers used by compiler */
#define DOF_ID_PAD 10 /* start of padding bytes (all zeroes) */
#define DOF_MAG_MAG0 0x7F /* DOF_ID_MAG[0-3] */
#define DOF_MAG_MAG1 'D'
#define DOF_MAG_MAG2 'O'
#define DOF_MAG_MAG3 'F'
#define DOF_MAG_STRING "\177DOF"
#define DOF_MAG_STRLEN 4
#define DOF_MODEL_NONE 0 /* DOF_ID_MODEL */
#define DOF_MODEL_ILP32 1
#define DOF_MODEL_LP64 2
#ifdef _LP64
#define DOF_MODEL_NATIVE DOF_MODEL_LP64
#else
#define DOF_MODEL_NATIVE DOF_MODEL_ILP32
#endif
#define DOF_ENCODE_NONE 0 /* DOF_ID_ENCODING */
#define DOF_ENCODE_LSB 1
#define DOF_ENCODE_MSB 2
#ifdef _BIG_ENDIAN
#define DOF_ENCODE_NATIVE DOF_ENCODE_MSB
#else
#define DOF_ENCODE_NATIVE DOF_ENCODE_LSB
#endif
#define DOF_VERSION_1 1 /* DOF version 1: Solaris 10 FCS */
#define DOF_VERSION_2 2 /* DOF version 2: Solaris Express 6/06 */
#define DOF_VERSION DOF_VERSION_2 /* Latest DOF version */
#define DOF_FL_VALID 0 /* mask of all valid dofh_flags bits */
typedef uint32_t dof_secidx_t; /* section header table index type */
typedef uint32_t dof_stridx_t; /* string table index type */
#define DOF_SECIDX_NONE (-1U) /* null value for section indices */
#define DOF_STRIDX_NONE (-1U) /* null value for string indices */
typedef struct dof_sec {
uint32_t dofs_type; /* section type (see below) */
uint32_t dofs_align; /* section data memory alignment */
uint32_t dofs_flags; /* section flags (if any) */
uint32_t dofs_entsize; /* size of section entry (if table) */
uint64_t dofs_offset; /* offset of section data within file */
uint64_t dofs_size; /* size of section data in bytes */
} dof_sec_t;
#define DOF_SECT_NONE 0 /* null section */
#define DOF_SECT_COMMENTS 1 /* compiler comments */
#define DOF_SECT_SOURCE 2 /* D program source code */
#define DOF_SECT_ECBDESC 3 /* dof_ecbdesc_t */
#define DOF_SECT_PROBEDESC 4 /* dof_probedesc_t */
#define DOF_SECT_ACTDESC 5 /* dof_actdesc_t array */
#define DOF_SECT_DIFOHDR 6 /* dof_difohdr_t (variable length) */
#define DOF_SECT_DIF 7 /* uint32_t array of byte code */
#define DOF_SECT_STRTAB 8 /* string table */
#define DOF_SECT_VARTAB 9 /* dtrace_difv_t array */
#define DOF_SECT_RELTAB 10 /* dof_relodesc_t array */
#define DOF_SECT_TYPTAB 11 /* dtrace_diftype_t array */
#define DOF_SECT_URELHDR 12 /* dof_relohdr_t (user relocations) */
#define DOF_SECT_KRELHDR 13 /* dof_relohdr_t (kernel relocations) */
#define DOF_SECT_OPTDESC 14 /* dof_optdesc_t array */
#define DOF_SECT_PROVIDER 15 /* dof_provider_t */
#define DOF_SECT_PROBES 16 /* dof_probe_t array */
#define DOF_SECT_PRARGS 17 /* uint8_t array (probe arg mappings) */
#define DOF_SECT_PROFFS 18 /* uint32_t array (probe arg offsets) */
#define DOF_SECT_INTTAB 19 /* uint64_t array */
#define DOF_SECT_UTSNAME 20 /* struct utsname */
#define DOF_SECT_XLTAB 21 /* dof_xlref_t array */
#define DOF_SECT_XLMEMBERS 22 /* dof_xlmember_t array */
#define DOF_SECT_XLIMPORT 23 /* dof_xlator_t */
#define DOF_SECT_XLEXPORT 24 /* dof_xlator_t */
#define DOF_SECT_PREXPORT 25 /* dof_secidx_t array (exported objs) */
#define DOF_SECT_PRENOFFS 26 /* uint32_t array (enabled offsets) */
#define DOF_SECF_LOAD 1 /* section should be loaded */
#define DOF_SEC_ISLOADABLE(x) \
(((x) == DOF_SECT_ECBDESC) || ((x) == DOF_SECT_PROBEDESC) || \
((x) == DOF_SECT_ACTDESC) || ((x) == DOF_SECT_DIFOHDR) || \
((x) == DOF_SECT_DIF) || ((x) == DOF_SECT_STRTAB) || \
((x) == DOF_SECT_VARTAB) || ((x) == DOF_SECT_RELTAB) || \
((x) == DOF_SECT_TYPTAB) || ((x) == DOF_SECT_URELHDR) || \
((x) == DOF_SECT_KRELHDR) || ((x) == DOF_SECT_OPTDESC) || \
((x) == DOF_SECT_PROVIDER) || ((x) == DOF_SECT_PROBES) || \
((x) == DOF_SECT_PRARGS) || ((x) == DOF_SECT_PROFFS) || \
((x) == DOF_SECT_INTTAB) || ((x) == DOF_SECT_XLTAB) || \
((x) == DOF_SECT_XLMEMBERS) || ((x) == DOF_SECT_XLIMPORT) || \
((x) == DOF_SECT_XLIMPORT) || ((x) == DOF_SECT_XLEXPORT) || \
((x) == DOF_SECT_PREXPORT) || ((x) == DOF_SECT_PRENOFFS))
typedef struct dof_ecbdesc {
dof_secidx_t dofe_probes; /* link to DOF_SECT_PROBEDESC */
dof_secidx_t dofe_pred; /* link to DOF_SECT_DIFOHDR */
dof_secidx_t dofe_actions; /* link to DOF_SECT_ACTDESC */
uint32_t dofe_pad; /* reserved for future use */
uint64_t dofe_uarg; /* user-supplied library argument */
} dof_ecbdesc_t;
typedef struct dof_probedesc {
dof_secidx_t dofp_strtab; /* link to DOF_SECT_STRTAB section */
dof_stridx_t dofp_provider; /* provider string */
dof_stridx_t dofp_mod; /* module string */
dof_stridx_t dofp_func; /* function string */
dof_stridx_t dofp_name; /* name string */
uint32_t dofp_id; /* probe identifier (or zero) */
} dof_probedesc_t;
typedef struct dof_actdesc {
dof_secidx_t dofa_difo; /* link to DOF_SECT_DIFOHDR */
dof_secidx_t dofa_strtab; /* link to DOF_SECT_STRTAB section */
uint32_t dofa_kind; /* action kind (DTRACEACT_* constant) */
uint32_t dofa_ntuple; /* number of subsequent tuple actions */
uint64_t dofa_arg; /* kind-specific argument */
uint64_t dofa_uarg; /* user-supplied argument */
} dof_actdesc_t;
typedef struct dof_difohdr {
dtrace_diftype_t dofd_rtype; /* return type for this fragment */
dof_secidx_t dofd_links[1]; /* variable length array of indices */
} dof_difohdr_t;
typedef struct dof_relohdr {
dof_secidx_t dofr_strtab; /* link to DOF_SECT_STRTAB for names */
dof_secidx_t dofr_relsec; /* link to DOF_SECT_RELTAB for relos */
dof_secidx_t dofr_tgtsec; /* link to section we are relocating */
} dof_relohdr_t;
typedef struct dof_relodesc {
dof_stridx_t dofr_name; /* string name of relocation symbol */
uint32_t dofr_type; /* relo type (DOF_RELO_* constant) */
uint64_t dofr_offset; /* byte offset for relocation */
uint64_t dofr_data; /* additional type-specific data */
} dof_relodesc_t;
#define DOF_RELO_NONE 0 /* empty relocation entry */
#define DOF_RELO_SETX 1 /* relocate setx value */
typedef struct dof_optdesc {
uint32_t dofo_option; /* option identifier */
dof_secidx_t dofo_strtab; /* string table, if string option */
uint64_t dofo_value; /* option value or string index */
} dof_optdesc_t;
typedef uint32_t dof_attr_t; /* encoded stability attributes */
#define DOF_ATTR(n, d, c) (((n) << 24) | ((d) << 16) | ((c) << 8))
#define DOF_ATTR_NAME(a) (((a) >> 24) & 0xff)
#define DOF_ATTR_DATA(a) (((a) >> 16) & 0xff)
#define DOF_ATTR_CLASS(a) (((a) >> 8) & 0xff)
typedef struct dof_provider {
dof_secidx_t dofpv_strtab; /* link to DOF_SECT_STRTAB section */
dof_secidx_t dofpv_probes; /* link to DOF_SECT_PROBES section */
dof_secidx_t dofpv_prargs; /* link to DOF_SECT_PRARGS section */
dof_secidx_t dofpv_proffs; /* link to DOF_SECT_PROFFS section */
dof_stridx_t dofpv_name; /* provider name string */
dof_attr_t dofpv_provattr; /* provider attributes */
dof_attr_t dofpv_modattr; /* module attributes */
dof_attr_t dofpv_funcattr; /* function attributes */
dof_attr_t dofpv_nameattr; /* name attributes */
dof_attr_t dofpv_argsattr; /* args attributes */
dof_secidx_t dofpv_prenoffs; /* link to DOF_SECT_PRENOFFS section */
} dof_provider_t;
typedef struct dof_probe {
uint64_t dofpr_addr; /* probe base address or offset */
dof_stridx_t dofpr_func; /* probe function string */
dof_stridx_t dofpr_name; /* probe name string */
dof_stridx_t dofpr_nargv; /* native argument type strings */
dof_stridx_t dofpr_xargv; /* translated argument type strings */
uint32_t dofpr_argidx; /* index of first argument mapping */
uint32_t dofpr_offidx; /* index of first offset entry */
uint8_t dofpr_nargc; /* native argument count */
uint8_t dofpr_xargc; /* translated argument count */
uint16_t dofpr_noffs; /* number of offset entries for probe */
uint32_t dofpr_enoffidx; /* index of first is-enabled offset */
uint16_t dofpr_nenoffs; /* number of is-enabled offsets */
uint16_t dofpr_pad1; /* reserved for future use */
uint32_t dofpr_pad2; /* reserved for future use */
} dof_probe_t;
typedef struct dof_xlator {
dof_secidx_t dofxl_members; /* link to DOF_SECT_XLMEMBERS section */
dof_secidx_t dofxl_strtab; /* link to DOF_SECT_STRTAB section */
dof_stridx_t dofxl_argv; /* input parameter type strings */
uint32_t dofxl_argc; /* input parameter list length */
dof_stridx_t dofxl_type; /* output type string name */
dof_attr_t dofxl_attr; /* output stability attributes */
} dof_xlator_t;
typedef struct dof_xlmember {
dof_secidx_t dofxm_difo; /* member link to DOF_SECT_DIFOHDR */
dof_stridx_t dofxm_name; /* member name */
dtrace_diftype_t dofxm_type; /* member type */
} dof_xlmember_t;
typedef struct dof_xlref {
dof_secidx_t dofxr_xlator; /* link to DOF_SECT_XLATORS section */
uint32_t dofxr_member; /* index of referenced dof_xlmember */
uint32_t dofxr_argn; /* index of argument for DIF_OP_XLARG */
} dof_xlref_t;
/*
* DTrace Intermediate Format Object (DIFO)
*
* A DIFO is used to store the compiled DIF for a D expression, its return
* type, and its string and variable tables. The string table is a single
* buffer of character data into which sets instructions and variable
* references can reference strings using a byte offset. The variable table
* is an array of dtrace_difv_t structures that describe the name and type of
* each variable and the id used in the DIF code. This structure is described
* above in the DIF section of this header file. The DIFO is used at both
* user-level (in the library) and in the kernel, but the structure is never
* passed between the two: the DOF structures form the only interface. As a
* result, the definition can change depending on the presence of _KERNEL.
*/
typedef struct dtrace_difo {
dif_instr_t *dtdo_buf; /* instruction buffer */
uint64_t *dtdo_inttab; /* integer table (optional) */
char *dtdo_strtab; /* string table (optional) */
dtrace_difv_t *dtdo_vartab; /* variable table (optional) */
uint_t dtdo_len; /* length of instruction buffer */
uint_t dtdo_intlen; /* length of integer table */
uint_t dtdo_strlen; /* length of string table */
uint_t dtdo_varlen; /* length of variable table */
dtrace_diftype_t dtdo_rtype; /* return type */
uint_t dtdo_refcnt; /* owner reference count */
uint_t dtdo_destructive; /* invokes destructive subroutines */
#ifndef _KERNEL
dof_relodesc_t *dtdo_kreltab; /* kernel relocations */
dof_relodesc_t *dtdo_ureltab; /* user relocations */
struct dt_node **dtdo_xlmtab; /* translator references */
uint_t dtdo_krelen; /* length of krelo table */
uint_t dtdo_urelen; /* length of urelo table */
uint_t dtdo_xlmlen; /* length of translator table */
#endif
} dtrace_difo_t;
/*
* DTrace Enabling Description Structures
*
* When DTrace is tracking the description of a DTrace enabling entity (probe,
* predicate, action, ECB, record, etc.), it does so in a description
* structure. These structures all end in "desc", and are used at both
* user-level and in the kernel -- but (with the exception of
* dtrace_probedesc_t) they are never passed between them. Typically,
* user-level will use the description structures when assembling an enabling.
* It will then distill those description structures into a DOF object (see
* above), and send it into the kernel. The kernel will again use the
* description structures to create a description of the enabling as it reads
* the DOF. When the description is complete, the enabling will be actually
* created -- turning it into the structures that represent the enabling
* instead of merely describing it. Not surprisingly, the description
* structures bear a strong resemblance to the DOF structures that act as their
* conduit.
*/
struct dtrace_predicate;
typedef struct dtrace_probedesc {
dtrace_id_t dtpd_id; /* probe identifier */
char dtpd_provider[DTRACE_PROVNAMELEN]; /* probe provider name */
char dtpd_mod[DTRACE_MODNAMELEN]; /* probe module name */
char dtpd_func[DTRACE_FUNCNAMELEN]; /* probe function name */
char dtpd_name[DTRACE_NAMELEN]; /* probe name */
} dtrace_probedesc_t;
typedef struct dtrace_repldesc {
dtrace_probedesc_t dtrpd_match; /* probe descr. to match */
dtrace_probedesc_t dtrpd_create; /* probe descr. to create */
} dtrace_repldesc_t;
typedef struct dtrace_preddesc {
dtrace_difo_t *dtpdd_difo; /* pointer to DIF object */
struct dtrace_predicate *dtpdd_predicate; /* pointer to predicate */
} dtrace_preddesc_t;
typedef struct dtrace_actdesc {
dtrace_difo_t *dtad_difo; /* pointer to DIF object */
struct dtrace_actdesc *dtad_next; /* next action */
dtrace_actkind_t dtad_kind; /* kind of action */
uint32_t dtad_ntuple; /* number in tuple */
uint64_t dtad_arg; /* action argument */
uint64_t dtad_uarg; /* user argument */
int dtad_refcnt; /* reference count */
} dtrace_actdesc_t;
typedef struct dtrace_ecbdesc {
dtrace_actdesc_t *dted_action; /* action description(s) */
dtrace_preddesc_t dted_pred; /* predicate description */
dtrace_probedesc_t dted_probe; /* probe description */
uint64_t dted_uarg; /* library argument */
int dted_refcnt; /* reference count */
} dtrace_ecbdesc_t;
/*
* DTrace Metadata Description Structures
*
* DTrace separates the trace data stream from the metadata stream. The only
* metadata tokens placed in the data stream are the dtrace_rechdr_t (EPID +
* timestamp) or (in the case of aggregations) aggregation identifiers. To
* determine the structure of the data, DTrace consumers pass the token to the
* kernel, and receive in return a corresponding description of the enabled
* probe (via the dtrace_eprobedesc structure) or the aggregation (via the
* dtrace_aggdesc structure). Both of these structures are expressed in terms
* of record descriptions (via the dtrace_recdesc structure) that describe the
* exact structure of the data. Some record descriptions may also contain a
* format identifier; this additional bit of metadata can be retrieved from the
* kernel, for which a format description is returned via the dtrace_fmtdesc
* structure. Note that all four of these structures must be bitness-neutral
* to allow for a 32-bit DTrace consumer on a 64-bit kernel.
*/
typedef struct dtrace_recdesc {
dtrace_actkind_t dtrd_action; /* kind of action */
uint32_t dtrd_size; /* size of record */
uint32_t dtrd_offset; /* offset in ECB's data */
uint16_t dtrd_alignment; /* required alignment */
uint16_t dtrd_format; /* format, if any */
uint64_t dtrd_arg; /* action argument */
uint64_t dtrd_uarg; /* user argument */
} dtrace_recdesc_t;
typedef struct dtrace_eprobedesc {
dtrace_epid_t dtepd_epid; /* enabled probe ID */
dtrace_id_t dtepd_probeid; /* probe ID */
uint64_t dtepd_uarg; /* library argument */
uint32_t dtepd_size; /* total size */
int dtepd_nrecs; /* number of records */
dtrace_recdesc_t dtepd_rec[1]; /* records themselves */
} dtrace_eprobedesc_t;
typedef struct dtrace_aggdesc {
DTRACE_PTR(char, dtagd_name); /* not filled in by kernel */
dtrace_aggvarid_t dtagd_varid; /* not filled in by kernel */
int dtagd_flags; /* not filled in by kernel */
dtrace_aggid_t dtagd_id; /* aggregation ID */
dtrace_epid_t dtagd_epid; /* enabled probe ID */
uint32_t dtagd_size; /* size in bytes */
int dtagd_nrecs; /* number of records */
uint32_t dtagd_pad; /* explicit padding */
dtrace_recdesc_t dtagd_rec[1]; /* record descriptions */
} dtrace_aggdesc_t;
typedef struct dtrace_fmtdesc {
DTRACE_PTR(char, dtfd_string); /* format string */
int dtfd_length; /* length of format string */
uint16_t dtfd_format; /* format identifier */
} dtrace_fmtdesc_t;
#define DTRACE_SIZEOF_EPROBEDESC(desc) \
(sizeof (dtrace_eprobedesc_t) + ((desc)->dtepd_nrecs ? \
(((desc)->dtepd_nrecs - 1) * sizeof (dtrace_recdesc_t)) : 0))
#define DTRACE_SIZEOF_AGGDESC(desc) \
(sizeof (dtrace_aggdesc_t) + ((desc)->dtagd_nrecs ? \
(((desc)->dtagd_nrecs - 1) * sizeof (dtrace_recdesc_t)) : 0))
/*
* DTrace Option Interface
*
* Run-time DTrace options are set and retrieved via DOF_SECT_OPTDESC sections
* in a DOF image. The dof_optdesc structure contains an option identifier and
* an option value. The valid option identifiers are found below; the mapping
* between option identifiers and option identifying strings is maintained at
* user-level. Note that the value of DTRACEOPT_UNSET is such that all of the
* following are potentially valid option values: all positive integers, zero
* and negative one. Some options (notably "bufpolicy" and "bufresize") take
* predefined tokens as their values; these are defined with
* DTRACEOPT_{option}_{token}.
*/
#define DTRACEOPT_BUFSIZE 0 /* buffer size */
#define DTRACEOPT_BUFPOLICY 1 /* buffer policy */
#define DTRACEOPT_DYNVARSIZE 2 /* dynamic variable size */
#define DTRACEOPT_AGGSIZE 3 /* aggregation size */
#define DTRACEOPT_SPECSIZE 4 /* speculation size */
#define DTRACEOPT_NSPEC 5 /* number of speculations */
#define DTRACEOPT_STRSIZE 6 /* string size */
#define DTRACEOPT_CLEANRATE 7 /* dynvar cleaning rate */
#define DTRACEOPT_CPU 8 /* CPU to trace */
#define DTRACEOPT_BUFRESIZE 9 /* buffer resizing policy */
#define DTRACEOPT_GRABANON 10 /* grab anonymous state, if any */
#define DTRACEOPT_FLOWINDENT 11 /* indent function entry/return */
#define DTRACEOPT_QUIET 12 /* only output explicitly traced data */
#define DTRACEOPT_STACKFRAMES 13 /* number of stack frames */
#define DTRACEOPT_USTACKFRAMES 14 /* number of user stack frames */
#define DTRACEOPT_AGGRATE 15 /* aggregation snapshot rate */
#define DTRACEOPT_SWITCHRATE 16 /* buffer switching rate */
#define DTRACEOPT_STATUSRATE 17 /* status rate */
#define DTRACEOPT_DESTRUCTIVE 18 /* destructive actions allowed */
#define DTRACEOPT_STACKINDENT 19 /* output indent for stack traces */
#define DTRACEOPT_RAWBYTES 20 /* always print bytes in raw form */
#define DTRACEOPT_JSTACKFRAMES 21 /* number of jstack() frames */
#define DTRACEOPT_JSTACKSTRSIZE 22 /* size of jstack() string table */
#define DTRACEOPT_AGGSORTKEY 23 /* sort aggregations by key */
#define DTRACEOPT_AGGSORTREV 24 /* reverse-sort aggregations */
#define DTRACEOPT_AGGSORTPOS 25 /* agg. position to sort on */
#define DTRACEOPT_AGGSORTKEYPOS 26 /* agg. key position to sort on */
#define DTRACEOPT_TEMPORAL 27 /* temporally ordered output */
#define DTRACEOPT_AGGHIST 28 /* histogram aggregation output */
#define DTRACEOPT_AGGPACK 29 /* packed aggregation output */
#define DTRACEOPT_AGGZOOM 30 /* zoomed aggregation scaling */
#define DTRACEOPT_ZONE 31 /* zone in which to enable probes */
#define DTRACEOPT_MAX 32 /* number of options */
#define DTRACEOPT_UNSET (dtrace_optval_t)-2 /* unset option */
#define DTRACEOPT_BUFPOLICY_RING 0 /* ring buffer */
#define DTRACEOPT_BUFPOLICY_FILL 1 /* fill buffer, then stop */
#define DTRACEOPT_BUFPOLICY_SWITCH 2 /* switch buffers */
#define DTRACEOPT_BUFRESIZE_AUTO 0 /* automatic resizing */
#define DTRACEOPT_BUFRESIZE_MANUAL 1 /* manual resizing */
/*
* DTrace Buffer Interface
*
* In order to get a snapshot of the principal or aggregation buffer,
* user-level passes a buffer description to the kernel with the dtrace_bufdesc
* structure. This describes which CPU user-level is interested in, and
* where user-level wishes the kernel to snapshot the buffer to (the
* dtbd_data field). The kernel uses the same structure to pass back some
* information regarding the buffer: the size of data actually copied out, the
* number of drops, the number of errors, the offset of the oldest record,
* and the time of the snapshot.
*
* If the buffer policy is a "switch" policy, taking a snapshot of the
* principal buffer has the additional effect of switching the active and
* inactive buffers. Taking a snapshot of the aggregation buffer _always_ has
* the additional effect of switching the active and inactive buffers.
*/
typedef struct dtrace_bufdesc {
uint64_t dtbd_size; /* size of buffer */
uint32_t dtbd_cpu; /* CPU or DTRACE_CPUALL */
uint32_t dtbd_errors; /* number of errors */
uint64_t dtbd_drops; /* number of drops */
DTRACE_PTR(char, dtbd_data); /* data */
uint64_t dtbd_oldest; /* offset of oldest record */
uint64_t dtbd_timestamp; /* hrtime of snapshot */
} dtrace_bufdesc_t;
/*
* Each record in the buffer (dtbd_data) begins with a header that includes
* the epid and a timestamp. The timestamp is split into two 4-byte parts
* so that we do not require 8-byte alignment.
*/
typedef struct dtrace_rechdr {
dtrace_epid_t dtrh_epid; /* enabled probe id */
uint32_t dtrh_timestamp_hi; /* high bits of hrtime_t */
uint32_t dtrh_timestamp_lo; /* low bits of hrtime_t */
} dtrace_rechdr_t;
#define DTRACE_RECORD_LOAD_TIMESTAMP(dtrh) \
((dtrh)->dtrh_timestamp_lo + \
((uint64_t)(dtrh)->dtrh_timestamp_hi << 32))
#define DTRACE_RECORD_STORE_TIMESTAMP(dtrh, hrtime) { \
(dtrh)->dtrh_timestamp_lo = (uint32_t)hrtime; \
(dtrh)->dtrh_timestamp_hi = hrtime >> 32; \
}
/*
* DTrace Status
*
* The status of DTrace is relayed via the dtrace_status structure. This
* structure contains members to count drops other than the capacity drops
* available via the buffer interface (see above). This consists of dynamic
* drops (including capacity dynamic drops, rinsing drops and dirty drops), and
* speculative drops (including capacity speculative drops, drops due to busy
* speculative buffers and drops due to unavailable speculative buffers).
* Additionally, the status structure contains a field to indicate the number
* of "fill"-policy buffers have been filled and a boolean field to indicate
* that exit() has been called. If the dtst_exiting field is non-zero, no
* further data will be generated until tracing is stopped (at which time any
* enablings of the END action will be processed); if user-level sees that
* this field is non-zero, tracing should be stopped as soon as possible.
*/
typedef struct dtrace_status {
uint64_t dtst_dyndrops; /* dynamic drops */
uint64_t dtst_dyndrops_rinsing; /* dyn drops due to rinsing */
uint64_t dtst_dyndrops_dirty; /* dyn drops due to dirty */
uint64_t dtst_specdrops; /* speculative drops */
uint64_t dtst_specdrops_busy; /* spec drops due to busy */
uint64_t dtst_specdrops_unavail; /* spec drops due to unavail */
uint64_t dtst_errors; /* total errors */
uint64_t dtst_filled; /* number of filled bufs */
uint64_t dtst_stkstroverflows; /* stack string tab overflows */
uint64_t dtst_dblerrors; /* errors in ERROR probes */
char dtst_killed; /* non-zero if killed */
char dtst_exiting; /* non-zero if exit() called */
char dtst_pad[6]; /* pad out to 64-bit align */
} dtrace_status_t;
/*
* DTrace Configuration
*
* User-level may need to understand some elements of the kernel DTrace
* configuration in order to generate correct DIF. This information is
* conveyed via the dtrace_conf structure.
*/
typedef struct dtrace_conf {
uint_t dtc_difversion; /* supported DIF version */
uint_t dtc_difintregs; /* # of DIF integer registers */
uint_t dtc_diftupregs; /* # of DIF tuple registers */
uint_t dtc_ctfmodel; /* CTF data model */
uint_t dtc_pad[8]; /* reserved for future use */
} dtrace_conf_t;
/*
* DTrace Faults
*
* The constants below DTRACEFLT_LIBRARY indicate probe processing faults;
* constants at or above DTRACEFLT_LIBRARY indicate faults in probe
* postprocessing at user-level. Probe processing faults induce an ERROR
* probe and are replicated in unistd.d to allow users' ERROR probes to decode
* the error condition using thse symbolic labels.
*/
#define DTRACEFLT_UNKNOWN 0 /* Unknown fault */
#define DTRACEFLT_BADADDR 1 /* Bad address */
#define DTRACEFLT_BADALIGN 2 /* Bad alignment */
#define DTRACEFLT_ILLOP 3 /* Illegal operation */
#define DTRACEFLT_DIVZERO 4 /* Divide-by-zero */
#define DTRACEFLT_NOSCRATCH 5 /* Out of scratch space */
#define DTRACEFLT_KPRIV 6 /* Illegal kernel access */
#define DTRACEFLT_UPRIV 7 /* Illegal user access */
#define DTRACEFLT_TUPOFLOW 8 /* Tuple stack overflow */
#define DTRACEFLT_BADSTACK 9 /* Bad stack */
#define DTRACEFLT_LIBRARY 1000 /* Library-level fault */
/*
* DTrace Argument Types
*
* Because it would waste both space and time, argument types do not reside
* with the probe. In order to determine argument types for args[X]
* variables, the D compiler queries for argument types on a probe-by-probe
* basis. (This optimizes for the common case that arguments are either not
* used or used in an untyped fashion.) Typed arguments are specified with a
* string of the type name in the dtragd_native member of the argument
* description structure. Typed arguments may be further translated to types
* of greater stability; the provider indicates such a translated argument by
* filling in the dtargd_xlate member with the string of the translated type.
* Finally, the provider may indicate which argument value a given argument
* maps to by setting the dtargd_mapping member -- allowing a single argument
* to map to multiple args[X] variables.
*/
typedef struct dtrace_argdesc {
dtrace_id_t dtargd_id; /* probe identifier */
int dtargd_ndx; /* arg number (-1 iff none) */
int dtargd_mapping; /* value mapping */
char dtargd_native[DTRACE_ARGTYPELEN]; /* native type name */
char dtargd_xlate[DTRACE_ARGTYPELEN]; /* translated type name */
} dtrace_argdesc_t;
/*
* DTrace Stability Attributes
*
* Each DTrace provider advertises the name and data stability of each of its
* probe description components, as well as its architectural dependencies.
* The D compiler can query the provider attributes (dtrace_pattr_t below) in
* order to compute the properties of an input program and report them.
*/
typedef uint8_t dtrace_stability_t; /* stability code (see attributes(5)) */
typedef uint8_t dtrace_class_t; /* architectural dependency class */
#define DTRACE_STABILITY_INTERNAL 0 /* private to DTrace itself */
#define DTRACE_STABILITY_PRIVATE 1 /* private to Sun (see docs) */
#define DTRACE_STABILITY_OBSOLETE 2 /* scheduled for removal */
#define DTRACE_STABILITY_EXTERNAL 3 /* not controlled by Sun */
#define DTRACE_STABILITY_UNSTABLE 4 /* new or rapidly changing */
#define DTRACE_STABILITY_EVOLVING 5 /* less rapidly changing */
#define DTRACE_STABILITY_STABLE 6 /* mature interface from Sun */
#define DTRACE_STABILITY_STANDARD 7 /* industry standard */
#define DTRACE_STABILITY_MAX 7 /* maximum valid stability */
#define DTRACE_CLASS_UNKNOWN 0 /* unknown architectural dependency */
#define DTRACE_CLASS_CPU 1 /* CPU-module-specific */
#define DTRACE_CLASS_PLATFORM 2 /* platform-specific (uname -i) */
#define DTRACE_CLASS_GROUP 3 /* hardware-group-specific (uname -m) */
#define DTRACE_CLASS_ISA 4 /* ISA-specific (uname -p) */
#define DTRACE_CLASS_COMMON 5 /* common to all systems */
#define DTRACE_CLASS_MAX 5 /* maximum valid class */
#define DTRACE_PRIV_NONE 0x0000
#define DTRACE_PRIV_KERNEL 0x0001
#define DTRACE_PRIV_USER 0x0002
#define DTRACE_PRIV_PROC 0x0004
#define DTRACE_PRIV_OWNER 0x0008
#define DTRACE_PRIV_ZONEOWNER 0x0010
#define DTRACE_PRIV_ALL \
(DTRACE_PRIV_KERNEL | DTRACE_PRIV_USER | \
DTRACE_PRIV_PROC | DTRACE_PRIV_OWNER | DTRACE_PRIV_ZONEOWNER)
typedef struct dtrace_ppriv {
uint32_t dtpp_flags; /* privilege flags */
uid_t dtpp_uid; /* user ID */
zoneid_t dtpp_zoneid; /* zone ID */
} dtrace_ppriv_t;
typedef struct dtrace_attribute {
dtrace_stability_t dtat_name; /* entity name stability */
dtrace_stability_t dtat_data; /* entity data stability */
dtrace_class_t dtat_class; /* entity data dependency */
} dtrace_attribute_t;
typedef struct dtrace_pattr {
dtrace_attribute_t dtpa_provider; /* provider attributes */
dtrace_attribute_t dtpa_mod; /* module attributes */
dtrace_attribute_t dtpa_func; /* function attributes */
dtrace_attribute_t dtpa_name; /* name attributes */
dtrace_attribute_t dtpa_args; /* args[] attributes */
} dtrace_pattr_t;
typedef struct dtrace_providerdesc {
char dtvd_name[DTRACE_PROVNAMELEN]; /* provider name */
dtrace_pattr_t dtvd_attr; /* stability attributes */
dtrace_ppriv_t dtvd_priv; /* privileges required */
} dtrace_providerdesc_t;
/*
* DTrace Pseudodevice Interface
*
* DTrace is controlled through ioctl(2)'s to the in-kernel dtrace:dtrace
* pseudodevice driver. These ioctls comprise the user-kernel interface to
* DTrace.
*/
#define DTRACEIOC (('d' << 24) | ('t' << 16) | ('r' << 8))
#define DTRACEIOC_PROVIDER (DTRACEIOC | 1) /* provider query */
#define DTRACEIOC_PROBES (DTRACEIOC | 2) /* probe query */
#define DTRACEIOC_BUFSNAP (DTRACEIOC | 4) /* snapshot buffer */
#define DTRACEIOC_PROBEMATCH (DTRACEIOC | 5) /* match probes */
#define DTRACEIOC_ENABLE (DTRACEIOC | 6) /* enable probes */
#define DTRACEIOC_AGGSNAP (DTRACEIOC | 7) /* snapshot agg. */
#define DTRACEIOC_EPROBE (DTRACEIOC | 8) /* get eprobe desc. */
#define DTRACEIOC_PROBEARG (DTRACEIOC | 9) /* get probe arg */
#define DTRACEIOC_CONF (DTRACEIOC | 10) /* get config. */
#define DTRACEIOC_STATUS (DTRACEIOC | 11) /* get status */
#define DTRACEIOC_GO (DTRACEIOC | 12) /* start tracing */
#define DTRACEIOC_STOP (DTRACEIOC | 13) /* stop tracing */
#define DTRACEIOC_AGGDESC (DTRACEIOC | 15) /* get agg. desc. */
#define DTRACEIOC_FORMAT (DTRACEIOC | 16) /* get format str */
#define DTRACEIOC_DOFGET (DTRACEIOC | 17) /* get DOF */
#define DTRACEIOC_REPLICATE (DTRACEIOC | 18) /* replicate enab */
/*
* DTrace Helpers
*
* In general, DTrace establishes probes in processes and takes actions on
* processes without knowing their specific user-level structures. Instead of
* existing in the framework, process-specific knowledge is contained by the
* enabling D program -- which can apply process-specific knowledge by making
* appropriate use of DTrace primitives like copyin() and copyinstr() to
* operate on user-level data. However, there may exist some specific probes
* of particular semantic relevance that the application developer may wish to
* explicitly export. For example, an application may wish to export a probe
* at the point that it begins and ends certain well-defined transactions. In
* addition to providing probes, programs may wish to offer assistance for
* certain actions. For example, in highly dynamic environments (e.g., Java),
* it may be difficult to obtain a stack trace in terms of meaningful symbol
* names (the translation from instruction addresses to corresponding symbol
* names may only be possible in situ); these environments may wish to define
* a series of actions to be applied in situ to obtain a meaningful stack
* trace.
*
* These two mechanisms -- user-level statically defined tracing and assisting
* DTrace actions -- are provided via DTrace _helpers_. Helpers are specified
* via DOF, but unlike enabling DOF, helper DOF may contain definitions of
* providers, probes and their arguments. If a helper wishes to provide
* action assistance, probe descriptions and corresponding DIF actions may be
* specified in the helper DOF. For such helper actions, however, the probe
* description describes the specific helper: all DTrace helpers have the
* provider name "dtrace" and the module name "helper", and the name of the
* helper is contained in the function name (for example, the ustack() helper
* is named "ustack"). Any helper-specific name may be contained in the name
* (for example, if a helper were to have a constructor, it might be named
* "dtrace:helper:<helper>:init"). Helper actions are only called when the
* action that they are helping is taken. Helper actions may only return DIF
* expressions, and may only call the following subroutines:
*
* alloca() <= Allocates memory out of the consumer's scratch space
* bcopy() <= Copies memory to scratch space
* copyin() <= Copies memory from user-level into consumer's scratch
* copyinto() <= Copies memory into a specific location in scratch
* copyinstr() <= Copies a string into a specific location in scratch
*
* Helper actions may only access the following built-in variables:
*
* curthread <= Current kthread_t pointer
* tid <= Current thread identifier
* pid <= Current process identifier
* ppid <= Parent process identifier
* uid <= Current user ID
* gid <= Current group ID
* execname <= Current executable name
* zonename <= Current zone name
*
* Helper actions may not manipulate or allocate dynamic variables, but they
* may have clause-local and statically-allocated global variables. The
* helper action variable state is specific to the helper action -- variables
* used by the helper action may not be accessed outside of the helper
* action, and the helper action may not access variables that like outside
* of it. Helper actions may not load from kernel memory at-large; they are
* restricting to loading current user state (via copyin() and variants) and
* scratch space. As with probe enablings, helper actions are executed in
* program order. The result of the helper action is the result of the last
* executing helper expression.
*
* Helpers -- composed of either providers/probes or probes/actions (or both)
* -- are added by opening the "helper" minor node, and issuing an ioctl(2)
* (DTRACEHIOC_ADDDOF) that specifies the dof_helper_t structure. This
* encapsulates the name and base address of the user-level library or
* executable publishing the helpers and probes as well as the DOF that
* contains the definitions of those helpers and probes.
*
* The DTRACEHIOC_ADD and DTRACEHIOC_REMOVE are left in place for legacy
* helpers and should no longer be used. No other ioctls are valid on the
* helper minor node.
*/
#define DTRACEHIOC (('d' << 24) | ('t' << 16) | ('h' << 8))
#define DTRACEHIOC_ADD (DTRACEHIOC | 1) /* add helper */
#define DTRACEHIOC_REMOVE (DTRACEHIOC | 2) /* remove helper */
#define DTRACEHIOC_ADDDOF (DTRACEHIOC | 3) /* add helper DOF */
typedef struct dof_helper {
char dofhp_mod[DTRACE_MODNAMELEN]; /* executable or library name */
uint64_t dofhp_addr; /* base address of object */
uint64_t dofhp_dof; /* address of helper DOF */
} dof_helper_t;
#define DTRACEMNR_DTRACE "dtrace" /* node for DTrace ops */
#define DTRACEMNR_HELPER "helper" /* node for helpers */
#define DTRACEMNRN_DTRACE 0 /* minor for DTrace ops */
#define DTRACEMNRN_HELPER 1 /* minor for helpers */
#define DTRACEMNRN_CLONE 2 /* first clone minor */
#ifdef _KERNEL
/*
* DTrace Provider API
*
* The following functions are implemented by the DTrace framework and are
* used to implement separate in-kernel DTrace providers. Common functions
* are provided in uts/common/os/dtrace.c. ISA-dependent subroutines are
* defined in uts/<isa>/dtrace/dtrace_asm.s or uts/<isa>/dtrace/dtrace_isa.c.
*
* The provider API has two halves: the API that the providers consume from
* DTrace, and the API that providers make available to DTrace.
*
* 1 Framework-to-Provider API
*
* 1.1 Overview
*
* The Framework-to-Provider API is represented by the dtrace_pops structure
* that the provider passes to the framework when registering itself. This
* structure consists of the following members:
*
* dtps_provide() <-- Provide all probes, all modules
* dtps_provide_module() <-- Provide all probes in specified module
* dtps_enable() <-- Enable specified probe
* dtps_disable() <-- Disable specified probe
* dtps_suspend() <-- Suspend specified probe
* dtps_resume() <-- Resume specified probe
* dtps_getargdesc() <-- Get the argument description for args[X]
* dtps_getargval() <-- Get the value for an argX or args[X] variable
* dtps_mode() <-- Return the mode of the fired probe
* dtps_destroy() <-- Destroy all state associated with this probe
*
* 1.2 void dtps_provide(void *arg, const dtrace_probedesc_t *spec)
*
* 1.2.1 Overview
*
* Called to indicate that the provider should provide all probes. If the
* specified description is non-NULL, dtps_provide() is being called because
* no probe matched a specified probe -- if the provider has the ability to
* create custom probes, it may wish to create a probe that matches the
* specified description.
*
* 1.2.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_register(). The
* second argument is a pointer to a probe description that the provider may
* wish to consider when creating custom probes. The provider is expected to
* call back into the DTrace framework via dtrace_probe_create() to create
* any necessary probes. dtps_provide() may be called even if the provider
* has made available all probes; the provider should check the return value
* of dtrace_probe_create() to handle this case. Note that the provider need
* not implement both dtps_provide() and dtps_provide_module(); see
* "Arguments and Notes" for dtrace_register(), below.
*
* 1.2.3 Return value
*
* None.
*
* 1.2.4 Caller's context
*
* dtps_provide() is typically called from open() or ioctl() context, but may
* be called from other contexts as well. The DTrace framework is locked in
* such a way that providers may not register or unregister. This means that
* the provider may not call any DTrace API that affects its registration with
* the framework, including dtrace_register(), dtrace_unregister(),
* dtrace_invalidate(), and dtrace_condense(). However, the context is such
* that the provider may (and indeed, is expected to) call probe-related
* DTrace routines, including dtrace_probe_create(), dtrace_probe_lookup(),
* and dtrace_probe_arg().
*
* 1.3 void dtps_provide_module(void *arg, struct modctl *mp)
*
* 1.3.1 Overview
*
* Called to indicate that the provider should provide all probes in the
* specified module.
*
* 1.3.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_register(). The
* second argument is a pointer to a modctl structure that indicates the
* module for which probes should be created.
*
* 1.3.3 Return value
*
* None.
*
* 1.3.4 Caller's context
*
* dtps_provide_module() may be called from open() or ioctl() context, but
* may also be called from a module loading context. mod_lock is held, and
* the DTrace framework is locked in such a way that providers may not
* register or unregister. This means that the provider may not call any
* DTrace API that affects its registration with the framework, including
* dtrace_register(), dtrace_unregister(), dtrace_invalidate(), and
* dtrace_condense(). However, the context is such that the provider may (and
* indeed, is expected to) call probe-related DTrace routines, including
* dtrace_probe_create(), dtrace_probe_lookup(), and dtrace_probe_arg(). Note
* that the provider need not implement both dtps_provide() and
* dtps_provide_module(); see "Arguments and Notes" for dtrace_register(),
* below.
*
* 1.4 int dtps_enable(void *arg, dtrace_id_t id, void *parg)
*
* 1.4.1 Overview
*
* Called to enable the specified probe.
*
* 1.4.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_register(). The
* second argument is the identifier of the probe to be enabled. The third
* argument is the probe argument as passed to dtrace_probe_create().
* dtps_enable() will be called when a probe transitions from not being
* enabled at all to having one or more ECB. The number of ECBs associated
* with the probe may change without subsequent calls into the provider.
* When the number of ECBs drops to zero, the provider will be explicitly
* told to disable the probe via dtps_disable(). dtrace_probe() should never
* be called for a probe identifier that hasn't been explicitly enabled via
* dtps_enable().
*
* 1.4.3 Return value
*
* On success, dtps_enable() should return 0. On failure, -1 should be
* returned.
*
* 1.4.4 Caller's context
*
* The DTrace framework is locked in such a way that it may not be called
* back into at all. cpu_lock is held. mod_lock is not held and may not
* be acquired.
*
* 1.5 void dtps_disable(void *arg, dtrace_id_t id, void *parg)
*
* 1.5.1 Overview
*
* Called to disable the specified probe.
*
* 1.5.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_register(). The
* second argument is the identifier of the probe to be disabled. The third
* argument is the probe argument as passed to dtrace_probe_create().
* dtps_disable() will be called when a probe transitions from being enabled
* to having zero ECBs. dtrace_probe() should never be called for a probe
* identifier that has been explicitly enabled via dtps_disable().
*
* 1.5.3 Return value
*
* None.
*
* 1.5.4 Caller's context
*
* The DTrace framework is locked in such a way that it may not be called
* back into at all. cpu_lock is held. mod_lock is not held and may not
* be acquired.
*
* 1.6 void dtps_suspend(void *arg, dtrace_id_t id, void *parg)
*
* 1.6.1 Overview
*
* Called to suspend the specified enabled probe. This entry point is for
* providers that may need to suspend some or all of their probes when CPUs
* are being powered on or when the boot monitor is being entered for a
* prolonged period of time.
*
* 1.6.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_register(). The
* second argument is the identifier of the probe to be suspended. The
* third argument is the probe argument as passed to dtrace_probe_create().
* dtps_suspend will only be called on an enabled probe. Providers that
* provide a dtps_suspend entry point will want to take roughly the action
* that it takes for dtps_disable.
*
* 1.6.3 Return value
*
* None.
*
* 1.6.4 Caller's context
*
* Interrupts are disabled. The DTrace framework is in a state such that the
* specified probe cannot be disabled or destroyed for the duration of
* dtps_suspend(). As interrupts are disabled, the provider is afforded
* little latitude; the provider is expected to do no more than a store to
* memory.
*
* 1.7 void dtps_resume(void *arg, dtrace_id_t id, void *parg)
*
* 1.7.1 Overview
*
* Called to resume the specified enabled probe. This entry point is for
* providers that may need to resume some or all of their probes after the
* completion of an event that induced a call to dtps_suspend().
*
* 1.7.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_register(). The
* second argument is the identifier of the probe to be resumed. The
* third argument is the probe argument as passed to dtrace_probe_create().
* dtps_resume will only be called on an enabled probe. Providers that
* provide a dtps_resume entry point will want to take roughly the action
* that it takes for dtps_enable.
*
* 1.7.3 Return value
*
* None.
*
* 1.7.4 Caller's context
*
* Interrupts are disabled. The DTrace framework is in a state such that the
* specified probe cannot be disabled or destroyed for the duration of
* dtps_resume(). As interrupts are disabled, the provider is afforded
* little latitude; the provider is expected to do no more than a store to
* memory.
*
* 1.8 void dtps_getargdesc(void *arg, dtrace_id_t id, void *parg,
* dtrace_argdesc_t *desc)
*
* 1.8.1 Overview
*
* Called to retrieve the argument description for an args[X] variable.
*
* 1.8.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_register(). The
* second argument is the identifier of the current probe. The third
* argument is the probe argument as passed to dtrace_probe_create(). The
* fourth argument is a pointer to the argument description. This
* description is both an input and output parameter: it contains the
* index of the desired argument in the dtargd_ndx field, and expects
* the other fields to be filled in upon return. If there is no argument
* corresponding to the specified index, the dtargd_ndx field should be set
* to DTRACE_ARGNONE.
*
* 1.8.3 Return value
*
* None. The dtargd_ndx, dtargd_native, dtargd_xlate and dtargd_mapping
* members of the dtrace_argdesc_t structure are all output values.
*
* 1.8.4 Caller's context
*
* dtps_getargdesc() is called from ioctl() context. mod_lock is held, and
* the DTrace framework is locked in such a way that providers may not
* register or unregister. This means that the provider may not call any
* DTrace API that affects its registration with the framework, including
* dtrace_register(), dtrace_unregister(), dtrace_invalidate(), and
* dtrace_condense().
*
* 1.9 uint64_t dtps_getargval(void *arg, dtrace_id_t id, void *parg,
* int argno, int aframes)
*
* 1.9.1 Overview
*
* Called to retrieve a value for an argX or args[X] variable.
*
* 1.9.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_register(). The
* second argument is the identifier of the current probe. The third
* argument is the probe argument as passed to dtrace_probe_create(). The
* fourth argument is the number of the argument (the X in the example in
* 1.9.1). The fifth argument is the number of stack frames that were used
* to get from the actual place in the code that fired the probe to
* dtrace_probe() itself, the so-called artificial frames. This argument may
* be used to descend an appropriate number of frames to find the correct
* values. If this entry point is left NULL, the dtrace_getarg() built-in
* function is used.
*
* 1.9.3 Return value
*
* The value of the argument.
*
* 1.9.4 Caller's context
*
* This is called from within dtrace_probe() meaning that interrupts
* are disabled. No locks should be taken within this entry point.
*
* 1.10 int dtps_mode(void *arg, dtrace_id_t id, void *parg)
*
* 1.10.1 Overview
*
* Called to determine the mode of a fired probe.
*
* 1.10.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_register(). The
* second argument is the identifier of the current probe. The third
* argument is the probe argument as passed to dtrace_probe_create(). This
* entry point must not be left NULL for providers whose probes allow for
* mixed mode tracing, that is to say those unanchored probes that can fire
* during kernel- or user-mode execution.
*
* 1.10.3 Return value
*
* A bitwise OR that encapsulates both the mode (either DTRACE_MODE_KERNEL
* or DTRACE_MODE_USER) and the policy when the privilege of the enabling
* is insufficient for that mode (a combination of DTRACE_MODE_NOPRIV_DROP,
* DTRACE_MODE_NOPRIV_RESTRICT, and DTRACE_MODE_LIMITEDPRIV_RESTRICT). If
* DTRACE_MODE_NOPRIV_DROP bit is set, insufficient privilege will result
* in the probe firing being silently ignored for the enabling; if the
* DTRACE_NODE_NOPRIV_RESTRICT bit is set, insufficient privilege will not
* prevent probe processing for the enabling, but restrictions will be in
* place that induce a UPRIV fault upon attempt to examine probe arguments
* or current process state. If the DTRACE_MODE_LIMITEDPRIV_RESTRICT bit
* is set, similar restrictions will be placed upon operation if the
* privilege is sufficient to process the enabling, but does not otherwise
* entitle the enabling to all zones. The DTRACE_MODE_NOPRIV_DROP and
* DTRACE_MODE_NOPRIV_RESTRICT are mutually exclusive (and one of these
* two policies must be specified), but either may be combined (or not)
* with DTRACE_MODE_LIMITEDPRIV_RESTRICT.
*
* 1.10.4 Caller's context
*
* This is called from within dtrace_probe() meaning that interrupts
* are disabled. No locks should be taken within this entry point.
*
* 1.11 void dtps_destroy(void *arg, dtrace_id_t id, void *parg)
*
* 1.11.1 Overview
*
* Called to destroy the specified probe.
*
* 1.11.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_register(). The
* second argument is the identifier of the probe to be destroyed. The third
* argument is the probe argument as passed to dtrace_probe_create(). The
* provider should free all state associated with the probe. The framework
* guarantees that dtps_destroy() is only called for probes that have either
* been disabled via dtps_disable() or were never enabled via dtps_enable().
* Once dtps_disable() has been called for a probe, no further call will be
* made specifying the probe.
*
* 1.11.3 Return value
*
* None.
*
* 1.11.4 Caller's context
*
* The DTrace framework is locked in such a way that it may not be called
* back into at all. mod_lock is held. cpu_lock is not held, and may not be
* acquired.
*
*
* 2 Provider-to-Framework API
*
* 2.1 Overview
*
* The Provider-to-Framework API provides the mechanism for the provider to
* register itself with the DTrace framework, to create probes, to lookup
* probes and (most importantly) to fire probes. The Provider-to-Framework
* consists of:
*
* dtrace_register() <-- Register a provider with the DTrace framework
* dtrace_unregister() <-- Remove a provider's DTrace registration
* dtrace_invalidate() <-- Invalidate the specified provider
* dtrace_condense() <-- Remove a provider's unenabled probes
* dtrace_attached() <-- Indicates whether or not DTrace has attached
* dtrace_probe_create() <-- Create a DTrace probe
* dtrace_probe_lookup() <-- Lookup a DTrace probe based on its name
* dtrace_probe_arg() <-- Return the probe argument for a specific probe
* dtrace_probe() <-- Fire the specified probe
*
* 2.2 int dtrace_register(const char *name, const dtrace_pattr_t *pap,
* uint32_t priv, cred_t *cr, const dtrace_pops_t *pops, void *arg,
* dtrace_provider_id_t *idp)
*
* 2.2.1 Overview
*
* dtrace_register() registers the calling provider with the DTrace
* framework. It should generally be called by DTrace providers in their
* attach(9E) entry point.
*
* 2.2.2 Arguments and Notes
*
* The first argument is the name of the provider. The second argument is a
* pointer to the stability attributes for the provider. The third argument
* is the privilege flags for the provider, and must be some combination of:
*
* DTRACE_PRIV_NONE <= All users may enable probes from this provider
*
* DTRACE_PRIV_PROC <= Any user with privilege of PRIV_DTRACE_PROC may
* enable probes from this provider
*
* DTRACE_PRIV_USER <= Any user with privilege of PRIV_DTRACE_USER may
* enable probes from this provider
*
* DTRACE_PRIV_KERNEL <= Any user with privilege of PRIV_DTRACE_KERNEL
* may enable probes from this provider
*
* DTRACE_PRIV_OWNER <= This flag places an additional constraint on
* the privilege requirements above. These probes
* require either (a) a user ID matching the user
* ID of the cred passed in the fourth argument
* or (b) the PRIV_PROC_OWNER privilege.
*
* DTRACE_PRIV_ZONEOWNER<= This flag places an additional constraint on
* the privilege requirements above. These probes
* require either (a) a zone ID matching the zone
* ID of the cred passed in the fourth argument
* or (b) the PRIV_PROC_ZONE privilege.
*
* Note that these flags designate the _visibility_ of the probes, not
* the conditions under which they may or may not fire.
*
* The fourth argument is the credential that is associated with the
* provider. This argument should be NULL if the privilege flags don't
* include DTRACE_PRIV_OWNER or DTRACE_PRIV_ZONEOWNER. If non-NULL, the
* framework stashes the uid and zoneid represented by this credential
* for use at probe-time, in implicit predicates. These limit visibility
* of the probes to users and/or zones which have sufficient privilege to
* access them.
*
* The fifth argument is a DTrace provider operations vector, which provides
* the implementation for the Framework-to-Provider API. (See Section 1,
* above.) This must be non-NULL, and each member must be non-NULL. The
* exceptions to this are (1) the dtps_provide() and dtps_provide_module()
* members (if the provider so desires, _one_ of these members may be left
* NULL -- denoting that the provider only implements the other) and (2)
* the dtps_suspend() and dtps_resume() members, which must either both be
* NULL or both be non-NULL.
*
* The sixth argument is a cookie to be specified as the first argument for
* each function in the Framework-to-Provider API. This argument may have
* any value.
*
* The final argument is a pointer to dtrace_provider_id_t. If
* dtrace_register() successfully completes, the provider identifier will be
* stored in the memory pointed to be this argument. This argument must be
* non-NULL.
*
* 2.2.3 Return value
*
* On success, dtrace_register() returns 0 and stores the new provider's
* identifier into the memory pointed to by the idp argument. On failure,
* dtrace_register() returns an errno:
*
* EINVAL The arguments passed to dtrace_register() were somehow invalid.
* This may because a parameter that must be non-NULL was NULL,
* because the name was invalid (either empty or an illegal
* provider name) or because the attributes were invalid.
*
* No other failure code is returned.
*
* 2.2.4 Caller's context
*
* dtrace_register() may induce calls to dtrace_provide(); the provider must
* hold no locks across dtrace_register() that may also be acquired by
* dtrace_provide(). cpu_lock and mod_lock must not be held.
*
* 2.3 int dtrace_unregister(dtrace_provider_t id)
*
* 2.3.1 Overview
*
* Unregisters the specified provider from the DTrace framework. It should
* generally be called by DTrace providers in their detach(9E) entry point.
*
* 2.3.2 Arguments and Notes
*
* The only argument is the provider identifier, as returned from a
* successful call to dtrace_register(). As a result of calling
* dtrace_unregister(), the DTrace framework will call back into the provider
* via the dtps_destroy() entry point. Once dtrace_unregister() successfully
* completes, however, the DTrace framework will no longer make calls through
* the Framework-to-Provider API.
*
* 2.3.3 Return value
*
* On success, dtrace_unregister returns 0. On failure, dtrace_unregister()
* returns an errno:
*
* EBUSY There are currently processes that have the DTrace pseudodevice
* open, or there exists an anonymous enabling that hasn't yet
* been claimed.
*
* No other failure code is returned.
*
* 2.3.4 Caller's context
*
* Because a call to dtrace_unregister() may induce calls through the
* Framework-to-Provider API, the caller may not hold any lock across
* dtrace_register() that is also acquired in any of the Framework-to-
* Provider API functions. Additionally, mod_lock may not be held.
*
* 2.4 void dtrace_invalidate(dtrace_provider_id_t id)
*
* 2.4.1 Overview
*
* Invalidates the specified provider. All subsequent probe lookups for the
* specified provider will fail, but its probes will not be removed.
*
* 2.4.2 Arguments and note
*
* The only argument is the provider identifier, as returned from a
* successful call to dtrace_register(). In general, a provider's probes
* always remain valid; dtrace_invalidate() is a mechanism for invalidating
* an entire provider, regardless of whether or not probes are enabled or
* not. Note that dtrace_invalidate() will _not_ prevent already enabled
* probes from firing -- it will merely prevent any new enablings of the
* provider's probes.
*
* 2.5 int dtrace_condense(dtrace_provider_id_t id)
*
* 2.5.1 Overview
*
* Removes all the unenabled probes for the given provider. This function is
* not unlike dtrace_unregister(), except that it doesn't remove the
* provider just as many of its associated probes as it can.
*
* 2.5.2 Arguments and Notes
*
* As with dtrace_unregister(), the sole argument is the provider identifier
* as returned from a successful call to dtrace_register(). As a result of
* calling dtrace_condense(), the DTrace framework will call back into the
* given provider's dtps_destroy() entry point for each of the provider's
* unenabled probes.
*
* 2.5.3 Return value
*
* Currently, dtrace_condense() always returns 0. However, consumers of this
* function should check the return value as appropriate; its behavior may
* change in the future.
*
* 2.5.4 Caller's context
*
* As with dtrace_unregister(), the caller may not hold any lock across
* dtrace_condense() that is also acquired in the provider's entry points.
* Also, mod_lock may not be held.
*
* 2.6 int dtrace_attached()
*
* 2.6.1 Overview
*
* Indicates whether or not DTrace has attached.
*
* 2.6.2 Arguments and Notes
*
* For most providers, DTrace makes initial contact beyond registration.
* That is, once a provider has registered with DTrace, it waits to hear
* from DTrace to create probes. However, some providers may wish to
* proactively create probes without first being told by DTrace to do so.
* If providers wish to do this, they must first call dtrace_attached() to
* determine if DTrace itself has attached. If dtrace_attached() returns 0,
* the provider must not make any other Provider-to-Framework API call.
*
* 2.6.3 Return value
*
* dtrace_attached() returns 1 if DTrace has attached, 0 otherwise.
*
* 2.7 int dtrace_probe_create(dtrace_provider_t id, const char *mod,
* const char *func, const char *name, int aframes, void *arg)
*
* 2.7.1 Overview
*
* Creates a probe with specified module name, function name, and name.
*
* 2.7.2 Arguments and Notes
*
* The first argument is the provider identifier, as returned from a
* successful call to dtrace_register(). The second, third, and fourth
* arguments are the module name, function name, and probe name,
* respectively. Of these, module name and function name may both be NULL
* (in which case the probe is considered to be unanchored), or they may both
* be non-NULL. The name must be non-NULL, and must point to a non-empty
* string.
*
* The fifth argument is the number of artificial stack frames that will be
* found on the stack when dtrace_probe() is called for the new probe. These
* artificial frames will be automatically be pruned should the stack() or
* stackdepth() functions be called as part of one of the probe's ECBs. If
* the parameter doesn't add an artificial frame, this parameter should be
* zero.
*
* The final argument is a probe argument that will be passed back to the
* provider when a probe-specific operation is called. (e.g., via
* dtps_enable(), dtps_disable(), etc.)
*
* Note that it is up to the provider to be sure that the probe that it
* creates does not already exist -- if the provider is unsure of the probe's
* existence, it should assure its absence with dtrace_probe_lookup() before
* calling dtrace_probe_create().
*
* 2.7.3 Return value
*
* dtrace_probe_create() always succeeds, and always returns the identifier
* of the newly-created probe.
*
* 2.7.4 Caller's context
*
* While dtrace_probe_create() is generally expected to be called from
* dtps_provide() and/or dtps_provide_module(), it may be called from other
* non-DTrace contexts. Neither cpu_lock nor mod_lock may be held.
*
* 2.8 dtrace_id_t dtrace_probe_lookup(dtrace_provider_t id, const char *mod,
* const char *func, const char *name)
*
* 2.8.1 Overview
*
* Looks up a probe based on provdider and one or more of module name,
* function name and probe name.
*
* 2.8.2 Arguments and Notes
*
* The first argument is the provider identifier, as returned from a
* successful call to dtrace_register(). The second, third, and fourth
* arguments are the module name, function name, and probe name,
* respectively. Any of these may be NULL; dtrace_probe_lookup() will return
* the identifier of the first probe that is provided by the specified
* provider and matches all of the non-NULL matching criteria.
* dtrace_probe_lookup() is generally used by a provider to be check the
* existence of a probe before creating it with dtrace_probe_create().
*
* 2.8.3 Return value
*
* If the probe exists, returns its identifier. If the probe does not exist,
* return DTRACE_IDNONE.
*
* 2.8.4 Caller's context
*
* While dtrace_probe_lookup() is generally expected to be called from
* dtps_provide() and/or dtps_provide_module(), it may also be called from
* other non-DTrace contexts. Neither cpu_lock nor mod_lock may be held.
*
* 2.9 void *dtrace_probe_arg(dtrace_provider_t id, dtrace_id_t probe)
*
* 2.9.1 Overview
*
* Returns the probe argument associated with the specified probe.
*
* 2.9.2 Arguments and Notes
*
* The first argument is the provider identifier, as returned from a
* successful call to dtrace_register(). The second argument is a probe
* identifier, as returned from dtrace_probe_lookup() or
* dtrace_probe_create(). This is useful if a probe has multiple
* provider-specific components to it: the provider can create the probe
* once with provider-specific state, and then add to the state by looking
* up the probe based on probe identifier.
*
* 2.9.3 Return value
*
* Returns the argument associated with the specified probe. If the
* specified probe does not exist, or if the specified probe is not provided
* by the specified provider, NULL is returned.
*
* 2.9.4 Caller's context
*
* While dtrace_probe_arg() is generally expected to be called from
* dtps_provide() and/or dtps_provide_module(), it may also be called from
* other non-DTrace contexts. Neither cpu_lock nor mod_lock may be held.
*
* 2.10 void dtrace_probe(dtrace_id_t probe, uintptr_t arg0, uintptr_t arg1,
* uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
*
* 2.10.1 Overview
*
* The epicenter of DTrace: fires the specified probes with the specified
* arguments.
*
* 2.10.2 Arguments and Notes
*
* The first argument is a probe identifier as returned by
* dtrace_probe_create() or dtrace_probe_lookup(). The second through sixth
* arguments are the values to which the D variables "arg0" through "arg4"
* will be mapped.
*
* dtrace_probe() should be called whenever the specified probe has fired --
* however the provider defines it.
*
* 2.10.3 Return value
*
* None.
*
* 2.10.4 Caller's context
*
* dtrace_probe() may be called in virtually any context: kernel, user,
* interrupt, high-level interrupt, with arbitrary adaptive locks held, with
* dispatcher locks held, with interrupts disabled, etc. The only latitude
* that must be afforded to DTrace is the ability to make calls within
* itself (and to its in-kernel subroutines) and the ability to access
* arbitrary (but mapped) memory. On some platforms, this constrains
* context. For example, on UltraSPARC, dtrace_probe() cannot be called
* from any context in which TL is greater than zero. dtrace_probe() may
* also not be called from any routine which may be called by dtrace_probe()
* -- which includes functions in the DTrace framework and some in-kernel
* DTrace subroutines. All such functions "dtrace_"; providers that
* instrument the kernel arbitrarily should be sure to not instrument these
* routines.
*/
typedef struct dtrace_pops {
void (*dtps_provide)(void *arg, const dtrace_probedesc_t *spec);
void (*dtps_provide_module)(void *arg, struct modctl *mp);
int (*dtps_enable)(void *arg, dtrace_id_t id, void *parg);
void (*dtps_disable)(void *arg, dtrace_id_t id, void *parg);
void (*dtps_suspend)(void *arg, dtrace_id_t id, void *parg);
void (*dtps_resume)(void *arg, dtrace_id_t id, void *parg);
void (*dtps_getargdesc)(void *arg, dtrace_id_t id, void *parg,
dtrace_argdesc_t *desc);
uint64_t (*dtps_getargval)(void *arg, dtrace_id_t id, void *parg,
int argno, int aframes);
int (*dtps_mode)(void *arg, dtrace_id_t id, void *parg);
void (*dtps_destroy)(void *arg, dtrace_id_t id, void *parg);
} dtrace_pops_t;
#define DTRACE_MODE_KERNEL 0x01
#define DTRACE_MODE_USER 0x02
#define DTRACE_MODE_NOPRIV_DROP 0x10
#define DTRACE_MODE_NOPRIV_RESTRICT 0x20
#define DTRACE_MODE_LIMITEDPRIV_RESTRICT 0x40
typedef uintptr_t dtrace_provider_id_t;
extern int dtrace_register(const char *, const dtrace_pattr_t *, uint32_t,
cred_t *, const dtrace_pops_t *, void *, dtrace_provider_id_t *);
extern int dtrace_unregister(dtrace_provider_id_t);
extern int dtrace_condense(dtrace_provider_id_t);
extern void dtrace_invalidate(dtrace_provider_id_t);
extern dtrace_id_t dtrace_probe_lookup(dtrace_provider_id_t, const char *,
const char *, const char *);
extern dtrace_id_t dtrace_probe_create(dtrace_provider_id_t, const char *,
const char *, const char *, int, void *);
extern void *dtrace_probe_arg(dtrace_provider_id_t, dtrace_id_t);
extern void dtrace_probe(dtrace_id_t, uintptr_t arg0, uintptr_t arg1,
uintptr_t arg2, uintptr_t arg3, uintptr_t arg4);
/*
* DTrace Meta Provider API
*
* The following functions are implemented by the DTrace framework and are
* used to implement meta providers. Meta providers plug into the DTrace
* framework and are used to instantiate new providers on the fly. At
* present, there is only one type of meta provider and only one meta
* provider may be registered with the DTrace framework at a time. The
* sole meta provider type provides user-land static tracing facilities
* by taking meta probe descriptions and adding a corresponding provider
* into the DTrace framework.
*
* 1 Framework-to-Provider
*
* 1.1 Overview
*
* The Framework-to-Provider API is represented by the dtrace_mops structure
* that the meta provider passes to the framework when registering itself as
* a meta provider. This structure consists of the following members:
*
* dtms_create_probe() <-- Add a new probe to a created provider
* dtms_provide_pid() <-- Create a new provider for a given process
* dtms_remove_pid() <-- Remove a previously created provider
*
* 1.2 void dtms_create_probe(void *arg, void *parg,
* dtrace_helper_probedesc_t *probedesc);
*
* 1.2.1 Overview
*
* Called by the DTrace framework to create a new probe in a provider
* created by this meta provider.
*
* 1.2.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_meta_register().
* The second argument is the provider cookie for the associated provider;
* this is obtained from the return value of dtms_provide_pid(). The third
* argument is the helper probe description.
*
* 1.2.3 Return value
*
* None
*
* 1.2.4 Caller's context
*
* dtms_create_probe() is called from either ioctl() or module load context
* in the context of a newly-created provider (that is, a provider that
* is a result of a call to dtms_provide_pid()). The DTrace framework is
* locked in such a way that meta providers may not register or unregister,
* such that no other thread can call into a meta provider operation and that
* atomicity is assured with respect to meta provider operations across
* dtms_provide_pid() and subsequent calls to dtms_create_probe().
* The context is thus effectively single-threaded with respect to the meta
* provider, and that the meta provider cannot call dtrace_meta_register()
* or dtrace_meta_unregister(). However, the context is such that the
* provider may (and is expected to) call provider-related DTrace provider
* APIs including dtrace_probe_create().
*
* 1.3 void *dtms_provide_pid(void *arg, dtrace_meta_provider_t *mprov,
* pid_t pid)
*
* 1.3.1 Overview
*
* Called by the DTrace framework to instantiate a new provider given the
* description of the provider and probes in the mprov argument. The
* meta provider should call dtrace_register() to insert the new provider
* into the DTrace framework.
*
* 1.3.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_meta_register().
* The second argument is a pointer to a structure describing the new
* helper provider. The third argument is the process identifier for
* process associated with this new provider. Note that the name of the
* provider as passed to dtrace_register() should be the contatenation of
* the dtmpb_provname member of the mprov argument and the processs
* identifier as a string.
*
* 1.3.3 Return value
*
* The cookie for the provider that the meta provider creates. This is
* the same value that it passed to dtrace_register().
*
* 1.3.4 Caller's context
*
* dtms_provide_pid() is called from either ioctl() or module load context.
* The DTrace framework is locked in such a way that meta providers may not
* register or unregister. This means that the meta provider cannot call
* dtrace_meta_register() or dtrace_meta_unregister(). However, the context
* is such that the provider may -- and is expected to -- call
* provider-related DTrace provider APIs including dtrace_register().
*
* 1.4 void dtms_remove_pid(void *arg, dtrace_meta_provider_t *mprov,
* pid_t pid)
*
* 1.4.1 Overview
*
* Called by the DTrace framework to remove a provider that had previously
* been instantiated via the dtms_provide_pid() entry point. The meta
* provider need not remove the provider immediately, but this entry
* point indicates that the provider should be removed as soon as possible
* using the dtrace_unregister() API.
*
* 1.4.2 Arguments and notes
*
* The first argument is the cookie as passed to dtrace_meta_register().
* The second argument is a pointer to a structure describing the helper
* provider. The third argument is the process identifier for process
* associated with this new provider.
*
* 1.4.3 Return value
*
* None
*
* 1.4.4 Caller's context
*
* dtms_remove_pid() is called from either ioctl() or exit() context.
* The DTrace framework is locked in such a way that meta providers may not
* register or unregister. This means that the meta provider cannot call
* dtrace_meta_register() or dtrace_meta_unregister(). However, the context
* is such that the provider may -- and is expected to -- call
* provider-related DTrace provider APIs including dtrace_unregister().
*/
typedef struct dtrace_helper_probedesc {
char *dthpb_mod; /* probe module */
char *dthpb_func; /* probe function */
char *dthpb_name; /* probe name */
uint64_t dthpb_base; /* base address */
uint32_t *dthpb_offs; /* offsets array */
uint32_t *dthpb_enoffs; /* is-enabled offsets array */
uint32_t dthpb_noffs; /* offsets count */
uint32_t dthpb_nenoffs; /* is-enabled offsets count */
uint8_t *dthpb_args; /* argument mapping array */
uint8_t dthpb_xargc; /* translated argument count */
uint8_t dthpb_nargc; /* native argument count */
char *dthpb_xtypes; /* translated types strings */
char *dthpb_ntypes; /* native types strings */
} dtrace_helper_probedesc_t;
typedef struct dtrace_helper_provdesc {
char *dthpv_provname; /* provider name */
dtrace_pattr_t dthpv_pattr; /* stability attributes */
} dtrace_helper_provdesc_t;
typedef struct dtrace_mops {
void (*dtms_create_probe)(void *, void *, dtrace_helper_probedesc_t *);
void *(*dtms_provide_pid)(void *, dtrace_helper_provdesc_t *, pid_t);
void (*dtms_remove_pid)(void *, dtrace_helper_provdesc_t *, pid_t);
} dtrace_mops_t;
typedef uintptr_t dtrace_meta_provider_id_t;
extern int dtrace_meta_register(const char *, const dtrace_mops_t *, void *,
dtrace_meta_provider_id_t *);
extern int dtrace_meta_unregister(dtrace_meta_provider_id_t);
/*
* DTrace Kernel Hooks
*
* The following functions are implemented by the base kernel and form a set of
* hooks used by the DTrace framework. DTrace hooks are implemented in either
* uts/common/os/dtrace_subr.c, an ISA-specific assembly file, or in a
* uts/<platform>/os/dtrace_subr.c corresponding to each hardware platform.
*/
typedef enum dtrace_vtime_state {
DTRACE_VTIME_INACTIVE = 0, /* No DTrace, no TNF */
DTRACE_VTIME_ACTIVE, /* DTrace virtual time, no TNF */
DTRACE_VTIME_INACTIVE_TNF, /* No DTrace, TNF active */
DTRACE_VTIME_ACTIVE_TNF /* DTrace virtual time _and_ TNF */
} dtrace_vtime_state_t;
extern dtrace_vtime_state_t dtrace_vtime_active;
extern void dtrace_vtime_switch(kthread_t *next);
extern void dtrace_vtime_enable_tnf(void);
extern void dtrace_vtime_disable_tnf(void);
extern void dtrace_vtime_enable(void);
extern void dtrace_vtime_disable(void);
struct regs;
extern int (*dtrace_pid_probe_ptr)(struct regs *);
extern int (*dtrace_return_probe_ptr)(struct regs *);
extern void (*dtrace_fasttrap_fork_ptr)(proc_t *, proc_t *);
extern void (*dtrace_fasttrap_exec_ptr)(proc_t *);
extern void (*dtrace_fasttrap_exit_ptr)(proc_t *);
extern void dtrace_fasttrap_fork(proc_t *, proc_t *);
typedef uintptr_t dtrace_icookie_t;
typedef void (*dtrace_xcall_t)(void *);
extern dtrace_icookie_t dtrace_interrupt_disable(void);
extern void dtrace_interrupt_enable(dtrace_icookie_t);
extern void dtrace_membar_producer(void);
extern void dtrace_membar_consumer(void);
extern void (*dtrace_cpu_init)(processorid_t);
extern void (*dtrace_modload)(struct modctl *);
extern void (*dtrace_modunload)(struct modctl *);
extern void (*dtrace_helpers_cleanup)(proc_t *);
extern void (*dtrace_helpers_fork)(proc_t *parent, proc_t *child);
extern void (*dtrace_cpustart_init)();
extern void (*dtrace_cpustart_fini)();
extern void (*dtrace_closef)();
extern void (*dtrace_debugger_init)();
extern void (*dtrace_debugger_fini)();
extern dtrace_cacheid_t dtrace_predcache_id;
extern hrtime_t dtrace_gethrtime(void);
extern void dtrace_sync(void);
extern void dtrace_toxic_ranges(void (*)(uintptr_t, uintptr_t));
extern void dtrace_xcall(processorid_t, dtrace_xcall_t, void *);
extern void dtrace_vpanic(const char *, __va_list);
extern void dtrace_panic(const char *, ...);
extern int dtrace_safe_defer_signal(void);
extern void dtrace_safe_synchronous_signal(void);
extern int dtrace_mach_aframes(void);
#if defined(__i386) || defined(__amd64)
extern int dtrace_instr_size(uchar_t *instr);
extern int dtrace_instr_size_isa(uchar_t *, model_t, int *);
extern void dtrace_invop_add(int (*)(uintptr_t, uintptr_t *, uintptr_t));
extern void dtrace_invop_remove(int (*)(uintptr_t, uintptr_t *, uintptr_t));
extern void dtrace_invop_callsite(void);
#endif
#ifdef __sparc
extern int dtrace_blksuword32(uintptr_t, uint32_t *, int);
extern void dtrace_getfsr(uint64_t *);
#endif
#define DTRACE_CPUFLAG_ISSET(flag) \
(cpu_core[CPU->cpu_id].cpuc_dtrace_flags & (flag))
#define DTRACE_CPUFLAG_SET(flag) \
(cpu_core[CPU->cpu_id].cpuc_dtrace_flags |= (flag))
#define DTRACE_CPUFLAG_CLEAR(flag) \
(cpu_core[CPU->cpu_id].cpuc_dtrace_flags &= ~(flag))
#endif /* _KERNEL */
#endif /* _ASM */
#if defined(__i386) || defined(__amd64)
#define DTRACE_INVOP_PUSHL_EBP 1
#define DTRACE_INVOP_POPL_EBP 2
#define DTRACE_INVOP_LEAVE 3
#define DTRACE_INVOP_NOP 4
#define DTRACE_INVOP_RET 5
#endif
#ifdef __cplusplus
}
#endif
#endif /* _SYS_DTRACE_H */