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 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/stack.h> 29 #include <sys/regset.h> 30 #include <sys/frame.h> 31 #include <sys/sysmacros.h> 32 33 #include <stdlib.h> 34 #include <unistd.h> 35 #include <sys/types.h> 36 #include <errno.h> 37 #include <string.h> 38 39 #include "Pcontrol.h" 40 #include "Pstack.h" 41 #include "Pisadep.h" 42 43 #define M_PLT_NRSV 4 /* reserved PLT entries */ 44 #define M_PLT_ENTSIZE 12 /* size of each PLT entry */ 45 46 #define SYSCALL32 0x91d02008 /* 32-bit syscall (ta 8) instruction */ 47 48 #ifndef WINDOWSIZE32 49 #define WINDOWSIZE32 (16 * sizeof (int32_t)) 50 #endif 51 52 const char * 53 Ppltdest(struct ps_prochandle *P, uintptr_t pltaddr) 54 { 55 map_info_t *mp = Paddr2mptr(P, pltaddr); 56 57 uintptr_t r_addr; 58 file_info_t *fp; 59 Elf32_Rela r; 60 size_t i; 61 62 if (mp == NULL || (fp = mp->map_file) == NULL || 63 fp->file_plt_base == 0 || pltaddr < fp->file_plt_base || 64 pltaddr >= fp->file_plt_base + fp->file_plt_size) { 65 errno = EINVAL; 66 return (NULL); 67 } 68 69 i = (pltaddr - fp->file_plt_base - 70 M_PLT_NRSV * M_PLT_ENTSIZE) / M_PLT_ENTSIZE; 71 72 r_addr = fp->file_jmp_rel + i * sizeof (Elf32_Rela); 73 74 if (Pread(P, &r, sizeof (r), r_addr) == sizeof (r) && 75 (i = ELF32_R_SYM(r.r_info)) < fp->file_dynsym.sym_symn) { 76 77 Elf_Data *data = fp->file_dynsym.sym_data_pri; 78 Elf32_Sym *symp = &(((Elf32_Sym *)data->d_buf)[i]); 79 80 return (fp->file_dynsym.sym_strs + symp->st_name); 81 } 82 83 return (NULL); 84 } 85 86 int 87 Pissyscall(struct ps_prochandle *P, uintptr_t addr) 88 { 89 instr_t sysinstr; 90 instr_t instr; 91 92 sysinstr = SYSCALL32; 93 94 if (Pread(P, &instr, sizeof (instr), addr) != sizeof (instr) || 95 instr != sysinstr) 96 return (0); 97 else 98 return (1); 99 } 100 101 int 102 Pissyscall_prev(struct ps_prochandle *P, uintptr_t addr, uintptr_t *dst) 103 { 104 uintptr_t prevaddr = addr - sizeof (instr_t); 105 106 if (Pissyscall(P, prevaddr)) { 107 if (dst) 108 *dst = prevaddr; 109 return (1); 110 } 111 112 return (0); 113 } 114 115 /* ARGSUSED */ 116 int 117 Pissyscall_text(struct ps_prochandle *P, const void *buf, size_t buflen) 118 { 119 instr_t sysinstr; 120 121 sysinstr = SYSCALL32; 122 123 if (buflen >= sizeof (instr_t) && 124 memcmp(buf, &sysinstr, sizeof (instr_t)) == 0) 125 return (1); 126 else 127 return (0); 128 } 129 130 /* 131 * For gwindows_t support, we define a structure to pass arguments to 132 * a Plwp_iter() callback routine. 133 */ 134 typedef struct { 135 struct ps_prochandle *gq_proc; /* libproc handle */ 136 struct rwindow *gq_rwin; /* rwindow destination buffer */ 137 uintptr_t gq_addr; /* stack address to match */ 138 } gwin_query_t; 139 140 static int 141 find_gwin(gwin_query_t *gqp, const lwpstatus_t *psp) 142 { 143 gwindows_t gwin; 144 struct stat64 st; 145 char path[64]; 146 ssize_t n; 147 int fd, i; 148 int rv = 0; /* Return value for skip to next lwp */ 149 150 (void) snprintf(path, sizeof (path), "/proc/%d/lwp/%d/gwindows", 151 (int)gqp->gq_proc->pid, (int)psp->pr_lwpid); 152 153 if (stat64(path, &st) == -1 || st.st_size == 0) 154 return (0); /* Nothing doing; skip to next lwp */ 155 156 if ((fd = open64(path, O_RDONLY)) >= 0) { 157 /* 158 * Zero out the gwindows_t because the gwindows file only has 159 * as much data as needed to represent the saved windows. 160 */ 161 (void) memset(&gwin, 0, sizeof (gwin)); 162 n = read(fd, &gwin, sizeof (gwin)); 163 164 if (n > 0) { 165 /* 166 * If we actually found a non-zero gwindows file and 167 * were able to read it, iterate through the buffers 168 * looking for a stack pointer match; if one is found, 169 * copy out the corresponding register window. 170 */ 171 for (i = 0; i < gwin.wbcnt; i++) { 172 if (gwin.spbuf[i] == (greg_t *)gqp->gq_addr) { 173 (void) memcpy(gqp->gq_rwin, 174 &gwin.wbuf[i], 175 sizeof (struct rwindow)); 176 177 rv = 1; /* We're done */ 178 break; 179 } 180 } 181 } 182 (void) close(fd); 183 } 184 185 return (rv); 186 } 187 188 static int 189 read_gwin(struct ps_prochandle *P, struct rwindow *rwp, uintptr_t sp) 190 { 191 gwin_query_t gq; 192 193 if (P->state == PS_DEAD) { 194 lwp_info_t *lwp = list_next(&P->core->core_lwp_head); 195 uint_t n; 196 int i; 197 198 for (n = 0; n < P->core->core_nlwp; n++, lwp = list_next(lwp)) { 199 gwindows_t *gwin = lwp->lwp_gwins; 200 201 if (gwin == NULL) 202 continue; /* No gwindows for this lwp */ 203 204 /* 205 * If this lwp has gwindows associated with it, iterate 206 * through the buffers looking for a stack pointer 207 * match; if one is found, copy out the register window. 208 */ 209 for (i = 0; i < gwin->wbcnt; i++) { 210 if (gwin->spbuf[i] == (greg_t *)sp) { 211 (void) memcpy(rwp, &gwin->wbuf[i], 212 sizeof (struct rwindow)); 213 return (0); /* We're done */ 214 } 215 } 216 } 217 218 return (-1); /* No gwindows match found */ 219 220 } 221 222 gq.gq_proc = P; 223 gq.gq_rwin = rwp; 224 gq.gq_addr = sp; 225 226 return (Plwp_iter(P, (proc_lwp_f *)find_gwin, &gq) ? 0 : -1); 227 } 228 229 static void 230 ucontext_n_to_prgregs(const ucontext_t *src, prgregset_t dst) 231 { 232 const greg_t *gregs = &src->uc_mcontext.gregs[0]; 233 234 dst[R_PSR] = gregs[REG_PSR]; 235 dst[R_PC] = gregs[REG_PC]; 236 dst[R_nPC] = gregs[REG_nPC]; 237 dst[R_Y] = gregs[REG_Y]; 238 239 dst[R_G1] = gregs[REG_G1]; 240 dst[R_G2] = gregs[REG_G2]; 241 dst[R_G3] = gregs[REG_G3]; 242 dst[R_G4] = gregs[REG_G4]; 243 dst[R_G5] = gregs[REG_G5]; 244 dst[R_G6] = gregs[REG_G6]; 245 dst[R_G7] = gregs[REG_G7]; 246 247 dst[R_O0] = gregs[REG_O0]; 248 dst[R_O1] = gregs[REG_O1]; 249 dst[R_O2] = gregs[REG_O2]; 250 dst[R_O3] = gregs[REG_O3]; 251 dst[R_O4] = gregs[REG_O4]; 252 dst[R_O5] = gregs[REG_O5]; 253 dst[R_O6] = gregs[REG_O6]; 254 dst[R_O7] = gregs[REG_O7]; 255 } 256 257 int 258 Pstack_iter(struct ps_prochandle *P, const prgregset_t regs, 259 proc_stack_f *func, void *arg) 260 { 261 prgreg_t *prevfp = NULL; 262 uint_t pfpsize = 0; 263 int nfp = 0; 264 prgregset_t gregs; 265 long args[6]; 266 prgreg_t fp; 267 int i; 268 int rv; 269 uintptr_t sp; 270 ssize_t n; 271 uclist_t ucl; 272 ucontext_t uc; 273 274 init_uclist(&ucl, P); 275 (void) memcpy(gregs, regs, sizeof (gregs)); 276 277 for (;;) { 278 fp = gregs[R_FP]; 279 if (stack_loop(fp, &prevfp, &nfp, &pfpsize)) 280 break; 281 282 for (i = 0; i < 6; i++) 283 args[i] = gregs[R_I0 + i]; 284 if ((rv = func(arg, gregs, 6, args)) != 0) 285 break; 286 287 gregs[R_PC] = gregs[R_I7]; 288 gregs[R_nPC] = gregs[R_PC] + 4; 289 (void) memcpy(&gregs[R_O0], &gregs[R_I0], 8*sizeof (prgreg_t)); 290 if ((sp = gregs[R_FP]) == 0) 291 break; 292 293 sp += STACK_BIAS; 294 295 if (find_uclink(&ucl, sp + SA(sizeof (struct frame))) && 296 Pread(P, &uc, sizeof (uc), sp + 297 SA(sizeof (struct frame))) == sizeof (uc)) { 298 ucontext_n_to_prgregs(&uc, gregs); 299 sp = gregs[R_SP] + STACK_BIAS; 300 } 301 302 n = Pread(P, &gregs[R_L0], sizeof (struct rwindow), sp); 303 304 if (n == sizeof (struct rwindow)) 305 continue; 306 307 /* 308 * If we get here, then our Pread of the register window 309 * failed. If this is because the address was not mapped, 310 * then we attempt to read this window via any gwindows 311 * information we have. If that too fails, abort our loop. 312 */ 313 if (n > 0) 314 break; /* Failed for reason other than not mapped */ 315 316 if (read_gwin(P, (struct rwindow *)&gregs[R_L0], sp) == -1) 317 break; /* No gwindows match either */ 318 } 319 320 if (prevfp) 321 free(prevfp); 322 323 free_uclist(&ucl); 324 return (rv); 325 } 326 327 uintptr_t 328 Psyscall_setup(struct ps_prochandle *P, int nargs, int sysindex, uintptr_t sp) 329 { 330 sp -= (nargs > 6)? 331 WINDOWSIZE32 + sizeof (int32_t) * (1 + nargs) : 332 WINDOWSIZE32 + sizeof (int32_t) * (1 + 6); 333 sp = PSTACK_ALIGN32(sp); 334 335 P->status.pr_lwp.pr_reg[R_G1] = sysindex; 336 P->status.pr_lwp.pr_reg[R_SP] = sp; 337 P->status.pr_lwp.pr_reg[R_PC] = P->sysaddr; 338 P->status.pr_lwp.pr_reg[R_nPC] = P->sysaddr + sizeof (instr_t); 339 340 return (sp + WINDOWSIZE32 + sizeof (int32_t)); 341 } 342 343 int 344 Psyscall_copyinargs(struct ps_prochandle *P, int nargs, argdes_t *argp, 345 uintptr_t ap) 346 { 347 uint32_t arglist[MAXARGS+2]; 348 int i; 349 argdes_t *adp; 350 351 for (i = 0, adp = argp; i < nargs; i++, adp++) { 352 arglist[i] = adp->arg_value; 353 354 if (i < 6) 355 (void) Pputareg(P, R_O0+i, adp->arg_value); 356 } 357 358 if (nargs > 6 && 359 Pwrite(P, &arglist[0], sizeof (int32_t) * nargs, 360 (uintptr_t)ap) != sizeof (int32_t) * nargs) 361 return (-1); 362 363 return (0); 364 } 365 366 /* ARGSUSED */ 367 int 368 Psyscall_copyoutargs(struct ps_prochandle *P, int nargs, argdes_t *argp, 369 uintptr_t ap) 370 { 371 /* Do nothing */ 372 return (0); 373 } 374