fasttrap_impl.h revision 262047
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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27#ifndef _FASTTRAP_IMPL_H 28#define _FASTTRAP_IMPL_H 29 30#pragma ident "%Z%%M% %I% %E% SMI" 31 32#include <sys/types.h> 33#include <sys/dtrace.h> 34#include <sys/proc.h> 35#include <sys/fasttrap.h> 36#include <sys/fasttrap_isa.h> 37 38#ifdef __cplusplus 39extern "C" { 40#endif 41 42/* 43 * Fasttrap Providers, Probes and Tracepoints 44 * 45 * Each Solaris process can have multiple providers -- the pid provider as 46 * well as any number of user-level statically defined tracing (USDT) 47 * providers. Those providers are each represented by a fasttrap_provider_t. 48 * All providers for a given process have a pointer to a shared 49 * fasttrap_proc_t. The fasttrap_proc_t has two states: active or defunct. 50 * When the count of active providers goes to zero it becomes defunct; a 51 * provider drops its active count when it is removed individually or as part 52 * of a mass removal when a process exits or performs an exec. 53 * 54 * Each probe is represented by a fasttrap_probe_t which has a pointer to 55 * its associated provider as well as a list of fasttrap_id_tp_t structures 56 * which are tuples combining a fasttrap_id_t and a fasttrap_tracepoint_t. 57 * A fasttrap_tracepoint_t represents the actual point of instrumentation 58 * and it contains two lists of fasttrap_id_t structures (to be fired pre- 59 * and post-instruction emulation) that identify the probes attached to the 60 * tracepoint. Tracepoints also have a pointer to the fasttrap_proc_t for the 61 * process they trace which is used when looking up a tracepoint both when a 62 * probe fires and when enabling and disabling probes. 63 * 64 * It's important to note that probes are preallocated with the necessary 65 * number of tracepoints, but that tracepoints can be shared by probes and 66 * swapped between probes. If a probe's preallocated tracepoint is enabled 67 * (and, therefore, the associated probe is enabled), and that probe is 68 * then disabled, ownership of that tracepoint may be exchanged for an 69 * unused tracepoint belonging to another probe that was attached to the 70 * enabled tracepoint. 71 */ 72 73typedef struct fasttrap_proc { 74 pid_t ftpc_pid; /* process ID for this proc */ 75 uint64_t ftpc_acount; /* count of active providers */ 76 uint64_t ftpc_rcount; /* count of extant providers */ 77 kmutex_t ftpc_mtx; /* lock on all but acount */ 78 struct fasttrap_proc *ftpc_next; /* next proc in hash chain */ 79} fasttrap_proc_t; 80 81typedef struct fasttrap_provider { 82 pid_t ftp_pid; /* process ID for this prov */ 83 char ftp_name[DTRACE_PROVNAMELEN]; /* prov name (w/o the pid) */ 84 dtrace_provider_id_t ftp_provid; /* DTrace provider handle */ 85 uint_t ftp_marked; /* mark for possible removal */ 86 uint_t ftp_retired; /* mark when retired */ 87 kmutex_t ftp_mtx; /* provider lock */ 88 kmutex_t ftp_cmtx; /* lock on creating probes */ 89 uint64_t ftp_rcount; /* enabled probes ref count */ 90 uint64_t ftp_ccount; /* consumers creating probes */ 91 uint64_t ftp_mcount; /* meta provider count */ 92 fasttrap_proc_t *ftp_proc; /* shared proc for all provs */ 93 struct fasttrap_provider *ftp_next; /* next prov in hash chain */ 94} fasttrap_provider_t; 95 96typedef struct fasttrap_id fasttrap_id_t; 97typedef struct fasttrap_probe fasttrap_probe_t; 98typedef struct fasttrap_tracepoint fasttrap_tracepoint_t; 99 100struct fasttrap_id { 101 fasttrap_probe_t *fti_probe; /* referrring probe */ 102 fasttrap_id_t *fti_next; /* enabled probe list on tp */ 103 fasttrap_probe_type_t fti_ptype; /* probe type */ 104}; 105 106typedef struct fasttrap_id_tp { 107 fasttrap_id_t fit_id; 108 fasttrap_tracepoint_t *fit_tp; 109} fasttrap_id_tp_t; 110 111struct fasttrap_probe { 112 dtrace_id_t ftp_id; /* DTrace probe identifier */ 113 pid_t ftp_pid; /* pid for this probe */ 114 fasttrap_provider_t *ftp_prov; /* this probe's provider */ 115 uintptr_t ftp_faddr; /* associated function's addr */ 116 size_t ftp_fsize; /* associated function's size */ 117 uint64_t ftp_gen; /* modification generation */ 118 uint64_t ftp_ntps; /* number of tracepoints */ 119 uint8_t *ftp_argmap; /* native to translated args */ 120 uint8_t ftp_nargs; /* translated argument count */ 121 uint8_t ftp_enabled; /* is this probe enabled */ 122 char *ftp_xtypes; /* translated types index */ 123 char *ftp_ntypes; /* native types index */ 124 fasttrap_id_tp_t ftp_tps[1]; /* flexible array */ 125}; 126 127#define FASTTRAP_ID_INDEX(id) \ 128((fasttrap_id_tp_t *)(((char *)(id) - offsetof(fasttrap_id_tp_t, fit_id))) - \ 129&(id)->fti_probe->ftp_tps[0]) 130 131struct fasttrap_tracepoint { 132 fasttrap_proc_t *ftt_proc; /* associated process struct */ 133 uintptr_t ftt_pc; /* address of tracepoint */ 134 pid_t ftt_pid; /* pid of tracepoint */ 135 fasttrap_machtp_t ftt_mtp; /* ISA-specific portion */ 136 fasttrap_id_t *ftt_ids; /* NULL-terminated list */ 137 fasttrap_id_t *ftt_retids; /* NULL-terminated list */ 138 fasttrap_tracepoint_t *ftt_next; /* link in global hash */ 139}; 140 141typedef struct fasttrap_bucket { 142 kmutex_t ftb_mtx; /* bucket lock */ 143 void *ftb_data; /* data payload */ 144 145 uint8_t ftb_pad[64 - sizeof (kmutex_t) - sizeof (void *)]; 146} fasttrap_bucket_t; 147 148typedef struct fasttrap_hash { 149 ulong_t fth_nent; /* power-of-2 num. of entries */ 150 ulong_t fth_mask; /* fth_nent - 1 */ 151 fasttrap_bucket_t *fth_table; /* array of buckets */ 152} fasttrap_hash_t; 153 154/* 155 * If at some future point these assembly functions become observable by 156 * DTrace, then these defines should become separate functions so that the 157 * fasttrap provider doesn't trigger probes during internal operations. 158 */ 159#define fasttrap_copyout copyout 160#define fasttrap_fuword32 fuword32 161#define fasttrap_suword32 suword32 162#define fasttrap_suword64 suword64 163 164#ifdef __amd64__ 165#define fasttrap_fulword fuword64 166#define fasttrap_sulword suword64 167#else 168#define fasttrap_fulword fuword32 169#define fasttrap_sulword suword32 170#endif 171 172extern void fasttrap_sigtrap(proc_t *, kthread_t *, uintptr_t); 173 174extern dtrace_id_t fasttrap_probe_id; 175extern fasttrap_hash_t fasttrap_tpoints; 176 177#define FASTTRAP_TPOINTS_INDEX(pid, pc) \ 178 (((pc) / sizeof (fasttrap_instr_t) + (pid)) & fasttrap_tpoints.fth_mask) 179 180/* 181 * Must be implemented by fasttrap_isa.c 182 */ 183extern int fasttrap_tracepoint_init(proc_t *, fasttrap_tracepoint_t *, 184 uintptr_t, fasttrap_probe_type_t); 185extern int fasttrap_tracepoint_install(proc_t *, fasttrap_tracepoint_t *); 186extern int fasttrap_tracepoint_remove(proc_t *, fasttrap_tracepoint_t *); 187 188struct reg; 189extern int fasttrap_pid_probe(struct reg *); 190extern int fasttrap_return_probe(struct reg *); 191 192extern uint64_t fasttrap_pid_getarg(void *, dtrace_id_t, void *, int, int); 193extern uint64_t fasttrap_usdt_getarg(void *, dtrace_id_t, void *, int, int); 194 195#ifdef __cplusplus 196} 197#endif 198 199#endif /* _FASTTRAP_IMPL_H */ 200