1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * Copyright (c) 2012, Joyent, Inc. All rights reserved. 29 * Copyright 2024 Oxide Computer Company 30 */ 31 32 #ifndef _SYS_SDT_IMPL_H 33 #define _SYS_SDT_IMPL_H 34 35 #ifdef __cplusplus 36 extern "C" { 37 #endif 38 39 #include <sys/dtrace.h> 40 41 #if defined(__i386) || defined(__amd64) 42 #define SDT_CALL 0xe8 43 #define SDT_NOP 0x90 44 #define SDT_RET 0xc3 45 46 /* 47 * The kernel runtime linker (krtld) will perform the patching described above 48 * and note the offset of the instruction that was patched for the SDT module 49 * in the sdpd_offset field of the sdt_probedesc_t structure. In the case of 50 * a tail call, this index will be a RET otherwise it will be a NOP. 51 */ 52 #define SDT_OFF_RET_IDX 3 53 54 typedef uint8_t sdt_instr_t; 55 #else 56 typedef uint32_t sdt_instr_t; 57 #endif 58 59 typedef struct sdt_provider { 60 char *sdtp_name; /* name of provider */ 61 char *sdtp_prefix; /* prefix for probe names */ 62 dtrace_pattr_t *sdtp_attr; /* stability attributes */ 63 uint32_t sdtp_priv; /* privilege, if any */ 64 dtrace_provider_id_t sdtp_id; /* provider ID */ 65 } sdt_provider_t; 66 67 extern sdt_provider_t sdt_providers[]; /* array of providers */ 68 69 typedef struct sdt_probe { 70 sdt_provider_t *sdp_provider; /* provider */ 71 char *sdp_name; /* name of probe */ 72 int sdp_namelen; /* length of allocated name */ 73 dtrace_id_t sdp_id; /* probe ID */ 74 struct modctl *sdp_ctl; /* modctl for module */ 75 int sdp_loadcnt; /* load count for module */ 76 int sdp_primary; /* non-zero if primary mod */ 77 sdt_instr_t *sdp_patchpoint; /* patch point */ 78 sdt_instr_t sdp_patchval; /* instruction to patch */ 79 sdt_instr_t sdp_savedval; /* saved instruction value */ 80 boolean_t sdp_is_tailcall; /* invoked as a tail call */ 81 struct sdt_probe *sdp_next; /* next probe */ 82 struct sdt_probe *sdp_hashnext; /* next on hash */ 83 } sdt_probe_t; 84 85 typedef struct sdt_argdesc { 86 const char *sda_provider; /* provider for arg */ 87 const char *sda_name; /* name of probe */ 88 const int sda_ndx; /* argument index */ 89 const int sda_mapping; /* mapping of argument */ 90 const char *sda_native; /* native type of argument */ 91 const char *sda_xlate; /* translated type of arg */ 92 } sdt_argdesc_t; 93 94 extern void sdt_getargdesc(void *, dtrace_id_t, void *, dtrace_argdesc_t *); 95 extern int sdt_mode(void *, dtrace_id_t, void *); 96 97 #ifdef __cplusplus 98 } 99 #endif 100 101 #endif /* _SYS_SDT_IMPL_H */ 102