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 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <stdarg.h> 30 #include <string.h> 31 #include "Pcontrol.h" 32 33 /* 34 * This file implements the process services declared in <proc_service.h>. 35 * This enables libproc to be used in conjunction with libc_db and 36 * librtld_db. As most of these facilities are already provided by 37 * (more elegant) interfaces in <libproc.h>, we can just call those. 38 * 39 * NOTE: We explicitly do *not* implement the functions ps_kill() and 40 * ps_lrolltoaddr() in this library. The very existence of these functions 41 * causes libc_db to create an "agent thread" in the target process. 42 * The only way to turn off this behavior is to omit these functions. 43 */ 44 45 #pragma weak ps_pdread = ps_pread 46 #pragma weak ps_ptread = ps_pread 47 #pragma weak ps_pdwrite = ps_pwrite 48 #pragma weak ps_ptwrite = ps_pwrite 49 50 ps_err_e 51 ps_pdmodel(struct ps_prochandle *P, int *modelp) 52 { 53 *modelp = P->status.pr_dmodel; 54 return (PS_OK); 55 } 56 57 ps_err_e 58 ps_pread(struct ps_prochandle *P, psaddr_t addr, void *buf, size_t size) 59 { 60 if (P->ops->p_pread(P, buf, size, addr) != size) 61 return (PS_BADADDR); 62 return (PS_OK); 63 } 64 65 ps_err_e 66 ps_pwrite(struct ps_prochandle *P, psaddr_t addr, const void *buf, size_t size) 67 { 68 if (P->ops->p_pwrite(P, buf, size, addr) != size) 69 return (PS_BADADDR); 70 return (PS_OK); 71 } 72 73 /* 74 * libc_db calls matched pairs of ps_pstop()/ps_pcontinue() 75 * in the belief that the client may have left the process 76 * running while calling in to the libc_db interfaces. 77 * 78 * We interpret the meaning of these functions to be an inquiry 79 * as to whether the process is stopped, not an action to be 80 * performed to make it stopped. For similar reasons, we also 81 * return PS_OK for core files in order to allow libc_db to 82 * operate on these as well. 83 */ 84 ps_err_e 85 ps_pstop(struct ps_prochandle *P) 86 { 87 if (P->state != PS_STOP && P->state != PS_DEAD) 88 return (PS_ERR); 89 return (PS_OK); 90 } 91 92 ps_err_e 93 ps_pcontinue(struct ps_prochandle *P) 94 { 95 if (P->state != PS_STOP && P->state != PS_DEAD) 96 return (PS_ERR); 97 return (PS_OK); 98 } 99 100 /* 101 * ps_lstop() and ps_lcontinue() are not called by any code in libc_db 102 * or librtld_db. We make them behave like ps_pstop() and ps_pcontinue(). 103 */ 104 /* ARGSUSED1 */ 105 ps_err_e 106 ps_lstop(struct ps_prochandle *P, lwpid_t lwpid) 107 { 108 if (P->state != PS_STOP && P->state != PS_DEAD) 109 return (PS_ERR); 110 return (PS_OK); 111 } 112 113 /* ARGSUSED1 */ 114 ps_err_e 115 ps_lcontinue(struct ps_prochandle *P, lwpid_t lwpid) 116 { 117 if (P->state != PS_STOP && P->state != PS_DEAD) 118 return (PS_ERR); 119 return (PS_OK); 120 } 121 122 ps_err_e 123 ps_lgetregs(struct ps_prochandle *P, lwpid_t lwpid, prgregset_t regs) 124 { 125 if (P->state != PS_STOP && P->state != PS_DEAD) 126 return (PS_ERR); 127 128 if (Plwp_getregs(P, lwpid, regs) == 0) 129 return (PS_OK); 130 131 return (PS_BADLID); 132 } 133 134 ps_err_e 135 ps_lsetregs(struct ps_prochandle *P, lwpid_t lwpid, const prgregset_t regs) 136 { 137 if (P->state != PS_STOP) 138 return (PS_ERR); 139 140 if (Plwp_setregs(P, lwpid, regs) == 0) 141 return (PS_OK); 142 143 return (PS_BADLID); 144 } 145 146 ps_err_e 147 ps_lgetfpregs(struct ps_prochandle *P, lwpid_t lwpid, prfpregset_t *regs) 148 { 149 if (P->state != PS_STOP && P->state != PS_DEAD) 150 return (PS_ERR); 151 152 if (Plwp_getfpregs(P, lwpid, regs) == 0) 153 return (PS_OK); 154 155 return (PS_BADLID); 156 } 157 158 ps_err_e 159 ps_lsetfpregs(struct ps_prochandle *P, lwpid_t lwpid, const prfpregset_t *regs) 160 { 161 if (P->state != PS_STOP) 162 return (PS_ERR); 163 164 if (Plwp_setfpregs(P, lwpid, regs) == 0) 165 return (PS_OK); 166 167 return (PS_BADLID); 168 } 169 170 #if defined(sparc) || defined(__sparc) 171 172 ps_err_e 173 ps_lgetxregsize(struct ps_prochandle *P, lwpid_t lwpid, int *xrsize) 174 { 175 char fname[64]; 176 struct stat statb; 177 178 if (P->state == PS_DEAD) { 179 lwp_info_t *lwp = list_next(&P->core->core_lwp_head); 180 uint_t i; 181 182 for (i = 0; i < P->core->core_nlwp; i++, lwp = list_next(lwp)) { 183 if (lwp->lwp_id == lwpid) { 184 if (lwp->lwp_xregs != NULL) 185 *xrsize = sizeof (prxregset_t); 186 else 187 *xrsize = 0; 188 return (PS_OK); 189 } 190 } 191 192 return (PS_BADLID); 193 } 194 195 (void) snprintf(fname, sizeof (fname), "/proc/%d/lwp/%d/xregs", 196 (int)P->status.pr_pid, (int)lwpid); 197 198 if (stat(fname, &statb) != 0) 199 return (PS_BADLID); 200 201 *xrsize = (int)statb.st_size; 202 return (PS_OK); 203 } 204 205 ps_err_e 206 ps_lgetxregs(struct ps_prochandle *P, lwpid_t lwpid, caddr_t xregs) 207 { 208 if (P->state != PS_STOP && P->state != PS_DEAD) 209 return (PS_ERR); 210 211 /* LINTED - alignment */ 212 if (Plwp_getxregs(P, lwpid, (prxregset_t *)xregs) == 0) 213 return (PS_OK); 214 215 return (PS_BADLID); 216 } 217 218 ps_err_e 219 ps_lsetxregs(struct ps_prochandle *P, lwpid_t lwpid, caddr_t xregs) 220 { 221 if (P->state != PS_STOP) 222 return (PS_ERR); 223 224 /* LINTED - alignment */ 225 if (Plwp_setxregs(P, lwpid, (prxregset_t *)xregs) == 0) 226 return (PS_OK); 227 228 return (PS_BADLID); 229 } 230 231 #endif /* sparc */ 232 233 #if defined(__i386) || defined(__amd64) 234 235 ps_err_e 236 ps_lgetLDT(struct ps_prochandle *P, lwpid_t lwpid, struct ssd *ldt) 237 { 238 #if defined(__amd64) && defined(_LP64) 239 if (P->status.pr_dmodel != PR_MODEL_NATIVE) { 240 #endif 241 prgregset_t regs; 242 struct ssd *ldtarray; 243 ps_err_e error; 244 uint_t gs; 245 int nldt; 246 int i; 247 248 if (P->state != PS_STOP && P->state != PS_DEAD) 249 return (PS_ERR); 250 251 /* 252 * We need to get the ldt entry that matches the 253 * value in the lwp's GS register. 254 */ 255 if ((error = ps_lgetregs(P, lwpid, regs)) != PS_OK) 256 return (error); 257 258 gs = regs[GS]; 259 260 if ((nldt = Pldt(P, NULL, 0)) <= 0 || 261 (ldtarray = malloc(nldt * sizeof (struct ssd))) == NULL) 262 return (PS_ERR); 263 if ((nldt = Pldt(P, ldtarray, nldt)) <= 0) { 264 free(ldtarray); 265 return (PS_ERR); 266 } 267 268 for (i = 0; i < nldt; i++) { 269 if (gs == ldtarray[i].sel) { 270 *ldt = ldtarray[i]; 271 break; 272 } 273 } 274 free(ldtarray); 275 276 if (i < nldt) 277 return (PS_OK); 278 #if defined(__amd64) && defined(_LP64) 279 } 280 #endif 281 282 return (PS_ERR); 283 } 284 285 #endif /* __i386 || __amd64 */ 286 287 /* 288 * Libthread_db doesn't use this function currently, but librtld_db uses 289 * it for its debugging output. We turn this on via rd_log if our debugging 290 * switch is on, and then echo the messages sent to ps_plog to stderr. 291 */ 292 void 293 ps_plog(const char *fmt, ...) 294 { 295 va_list ap; 296 297 if (_libproc_debug && fmt != NULL && *fmt != '\0') { 298 va_start(ap, fmt); 299 (void) vfprintf(stderr, fmt, ap); 300 va_end(ap); 301 if (fmt[strlen(fmt) - 1] != '\n') 302 (void) fputc('\n', stderr); 303 } 304 } 305 306 /* 307 * Store a pointer to our internal copy of the aux vector at the address 308 * specified by the caller. It should not hold on to this data for too long. 309 */ 310 ps_err_e 311 ps_pauxv(struct ps_prochandle *P, const auxv_t **aux) 312 { 313 if (P->auxv == NULL) 314 Preadauxvec(P); 315 316 if (P->auxv == NULL) 317 return (PS_ERR); 318 319 *aux = (const auxv_t *)P->auxv; 320 return (PS_OK); 321 } 322 323 /* 324 * Search for a symbol by name and return the corresponding address. 325 */ 326 ps_err_e 327 ps_pglobal_lookup(struct ps_prochandle *P, const char *object_name, 328 const char *sym_name, psaddr_t *sym_addr) 329 { 330 GElf_Sym sym; 331 332 if (Plookup_by_name(P, object_name, sym_name, &sym) == 0) { 333 dprintf("pglobal_lookup <%s> -> %p\n", 334 sym_name, (void *)(uintptr_t)sym.st_value); 335 *sym_addr = (psaddr_t)sym.st_value; 336 return (PS_OK); 337 } 338 339 return (PS_NOSYM); 340 } 341 342 /* 343 * Search for a symbol by name and return the corresponding symbol 344 * information. If we're compiled _LP64, we just call Plookup_by_name 345 * and return because ps_sym_t is defined to be an Elf64_Sym, which 346 * is the same as a GElf_Sym. In the _ILP32 case, we have to convert 347 * Plookup_by_name's result back to a ps_sym_t (which is an Elf32_Sym). 348 */ 349 ps_err_e 350 ps_pglobal_sym(struct ps_prochandle *P, const char *object_name, 351 const char *sym_name, ps_sym_t *symp) 352 { 353 #if defined(_ILP32) 354 GElf_Sym sym; 355 356 if (Plookup_by_name(P, object_name, sym_name, &sym) == 0) { 357 symp->st_name = (Elf32_Word)sym.st_name; 358 symp->st_value = (Elf32_Addr)sym.st_value; 359 symp->st_size = (Elf32_Word)sym.st_size; 360 symp->st_info = ELF32_ST_INFO( 361 GELF_ST_BIND(sym.st_info), GELF_ST_TYPE(sym.st_info)); 362 symp->st_other = sym.st_other; 363 symp->st_shndx = sym.st_shndx; 364 return (PS_OK); 365 } 366 367 #elif defined(_LP64) 368 if (Plookup_by_name(P, object_name, sym_name, symp) == 0) 369 return (PS_OK); 370 #endif 371 return (PS_NOSYM); 372 } 373