1/* Native-dependent code for GNU/Linux on MIPS processors. 2 3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 4 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21#include "defs.h" 22#include "inferior.h" 23#include "mips-tdep.h" 24#include "target.h" 25#include "regcache.h" 26#include "linux-nat.h" 27#include "mips-linux-tdep.h" 28#include "target-descriptions.h" 29#include "xml-support.h" 30 31#include "gdb_proc_service.h" 32#include "gregset.h" 33 34#include <sgidefs.h> 35#include <sys/ptrace.h> 36 37#ifndef PTRACE_GET_THREAD_AREA 38#define PTRACE_GET_THREAD_AREA 25 39#endif 40 41/* Assume that we have PTRACE_GETREGS et al. support. If we do not, 42 we'll clear this and use PTRACE_PEEKUSER instead. */ 43static int have_ptrace_regsets = 1; 44 45/* Saved function pointers to fetch and store a single register using 46 PTRACE_PEEKUSER and PTRACE_POKEUSER. */ 47 48void (*super_fetch_registers) (struct regcache *, int); 49void (*super_store_registers) (struct regcache *, int); 50 51/* Map gdb internal register number to ptrace ``address''. 52 These ``addresses'' are normally defined in <asm/ptrace.h>. 53 54 ptrace does not provide a way to read (or set) MIPS_PS_REGNUM, 55 and there's no point in reading or setting MIPS_ZERO_REGNUM. 56 We also can not set BADVADDR, CAUSE, or FCRIR via ptrace(). */ 57 58static CORE_ADDR 59mips_linux_register_addr (struct gdbarch *gdbarch, int regno, int store) 60{ 61 CORE_ADDR regaddr; 62 63 if (regno < 0 || regno >= gdbarch_num_regs (current_gdbarch)) 64 error (_("Bogon register number %d."), regno); 65 66 if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32) 67 regaddr = regno; 68 else if ((regno >= mips_regnum (gdbarch)->fp0) 69 && (regno < mips_regnum (gdbarch)->fp0 + 32)) 70 regaddr = FPR_BASE + (regno - mips_regnum (gdbarch)->fp0); 71 else if (regno == mips_regnum (gdbarch)->pc) 72 regaddr = PC; 73 else if (regno == mips_regnum (gdbarch)->cause) 74 regaddr = store? (CORE_ADDR) -1 : CAUSE; 75 else if (regno == mips_regnum (gdbarch)->badvaddr) 76 regaddr = store? (CORE_ADDR) -1 : BADVADDR; 77 else if (regno == mips_regnum (gdbarch)->lo) 78 regaddr = MMLO; 79 else if (regno == mips_regnum (gdbarch)->hi) 80 regaddr = MMHI; 81 else if (regno == mips_regnum (gdbarch)->fp_control_status) 82 regaddr = FPC_CSR; 83 else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) 84 regaddr = store? (CORE_ADDR) -1 : FPC_EIR; 85 else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM) 86 regaddr = 0; 87 else 88 regaddr = (CORE_ADDR) -1; 89 90 return regaddr; 91} 92 93static CORE_ADDR 94mips64_linux_register_addr (struct gdbarch *gdbarch, int regno, int store) 95{ 96 CORE_ADDR regaddr; 97 98 if (regno < 0 || regno >= gdbarch_num_regs (current_gdbarch)) 99 error (_("Bogon register number %d."), regno); 100 101 if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32) 102 regaddr = regno; 103 else if ((regno >= mips_regnum (gdbarch)->fp0) 104 && (regno < mips_regnum (gdbarch)->fp0 + 32)) 105 regaddr = MIPS64_FPR_BASE + (regno - gdbarch_fp0_regnum (current_gdbarch)); 106 else if (regno == mips_regnum (gdbarch)->pc) 107 regaddr = MIPS64_PC; 108 else if (regno == mips_regnum (gdbarch)->cause) 109 regaddr = store? (CORE_ADDR) -1 : MIPS64_CAUSE; 110 else if (regno == mips_regnum (gdbarch)->badvaddr) 111 regaddr = store? (CORE_ADDR) -1 : MIPS64_BADVADDR; 112 else if (regno == mips_regnum (gdbarch)->lo) 113 regaddr = MIPS64_MMLO; 114 else if (regno == mips_regnum (gdbarch)->hi) 115 regaddr = MIPS64_MMHI; 116 else if (regno == mips_regnum (gdbarch)->fp_control_status) 117 regaddr = MIPS64_FPC_CSR; 118 else if (regno == mips_regnum (gdbarch)->fp_implementation_revision) 119 regaddr = store? (CORE_ADDR) -1 : MIPS64_FPC_EIR; 120 else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM) 121 regaddr = 0; 122 else 123 regaddr = (CORE_ADDR) -1; 124 125 return regaddr; 126} 127 128/* Fetch the thread-local storage pointer for libthread_db. */ 129 130ps_err_e 131ps_get_thread_area (const struct ps_prochandle *ph, 132 lwpid_t lwpid, int idx, void **base) 133{ 134 if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) 135 return PS_ERR; 136 137 /* IDX is the bias from the thread pointer to the beginning of the 138 thread descriptor. It has to be subtracted due to implementation 139 quirks in libthread_db. */ 140 *base = (void *) ((char *)*base - idx); 141 142 return PS_OK; 143} 144 145/* Wrapper functions. These are only used by libthread_db. */ 146 147void 148supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) 149{ 150 if (mips_isa_regsize (current_gdbarch) == 4) 151 mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp); 152 else 153 mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp); 154} 155 156void 157fill_gregset (const struct regcache *regcache, 158 gdb_gregset_t *gregsetp, int regno) 159{ 160 if (mips_isa_regsize (current_gdbarch) == 4) 161 mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno); 162 else 163 mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno); 164} 165 166void 167supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) 168{ 169 if (mips_isa_regsize (current_gdbarch) == 4) 170 mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp); 171 else 172 mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp); 173} 174 175void 176fill_fpregset (const struct regcache *regcache, 177 gdb_fpregset_t *fpregsetp, int regno) 178{ 179 if (mips_isa_regsize (current_gdbarch) == 4) 180 mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno); 181 else 182 mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno); 183} 184 185 186/* Fetch REGNO (or all registers if REGNO == -1) from the target 187 using PTRACE_GETREGS et al. */ 188 189static void 190mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno) 191{ 192 int is_fp; 193 int tid; 194 195 if (regno >= mips_regnum (current_gdbarch)->fp0 196 && regno <= mips_regnum (current_gdbarch)->fp0 + 32) 197 is_fp = 1; 198 else if (regno == mips_regnum (current_gdbarch)->fp_control_status) 199 is_fp = 1; 200 else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision) 201 is_fp = 1; 202 else 203 is_fp = 0; 204 205 tid = ptid_get_lwp (inferior_ptid); 206 if (tid == 0) 207 tid = ptid_get_pid (inferior_ptid); 208 209 if (regno == -1 || !is_fp) 210 { 211 mips64_elf_gregset_t regs; 212 213 if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1) 214 { 215 if (errno == EIO) 216 { 217 have_ptrace_regsets = 0; 218 return; 219 } 220 perror_with_name (_("Couldn't get registers")); 221 } 222 223 mips64_supply_gregset (regcache, 224 (const mips64_elf_gregset_t *) ®s); 225 } 226 227 if (regno == -1 || is_fp) 228 { 229 mips64_elf_fpregset_t fp_regs; 230 231 if (ptrace (PTRACE_GETFPREGS, tid, 0L, 232 (PTRACE_TYPE_ARG3) &fp_regs) == -1) 233 { 234 if (errno == EIO) 235 { 236 have_ptrace_regsets = 0; 237 return; 238 } 239 perror_with_name (_("Couldn't get FP registers")); 240 } 241 242 mips64_supply_fpregset (regcache, 243 (const mips64_elf_fpregset_t *) &fp_regs); 244 } 245} 246 247/* Store REGNO (or all registers if REGNO == -1) to the target 248 using PTRACE_SETREGS et al. */ 249 250static void 251mips64_linux_regsets_store_registers (const struct regcache *regcache, int regno) 252{ 253 int is_fp; 254 int tid; 255 256 if (regno >= mips_regnum (current_gdbarch)->fp0 257 && regno <= mips_regnum (current_gdbarch)->fp0 + 32) 258 is_fp = 1; 259 else if (regno == mips_regnum (current_gdbarch)->fp_control_status) 260 is_fp = 1; 261 else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision) 262 is_fp = 1; 263 else 264 is_fp = 0; 265 266 tid = ptid_get_lwp (inferior_ptid); 267 if (tid == 0) 268 tid = ptid_get_pid (inferior_ptid); 269 270 if (regno == -1 || !is_fp) 271 { 272 mips64_elf_gregset_t regs; 273 274 if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1) 275 perror_with_name (_("Couldn't get registers")); 276 277 mips64_fill_gregset (regcache, ®s, regno); 278 279 if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1) 280 perror_with_name (_("Couldn't set registers")); 281 } 282 283 if (regno == -1 || is_fp) 284 { 285 mips64_elf_fpregset_t fp_regs; 286 287 if (ptrace (PTRACE_GETFPREGS, tid, 0L, 288 (PTRACE_TYPE_ARG3) &fp_regs) == -1) 289 perror_with_name (_("Couldn't get FP registers")); 290 291 mips64_fill_fpregset (regcache, &fp_regs, regno); 292 293 if (ptrace (PTRACE_SETFPREGS, tid, 0L, 294 (PTRACE_TYPE_ARG3) &fp_regs) == -1) 295 perror_with_name (_("Couldn't set FP registers")); 296 } 297} 298 299/* Fetch REGNO (or all registers if REGNO == -1) from the target 300 using any working method. */ 301 302static void 303mips64_linux_fetch_registers (struct regcache *regcache, int regnum) 304{ 305 /* Unless we already know that PTRACE_GETREGS does not work, try it. */ 306 if (have_ptrace_regsets) 307 mips64_linux_regsets_fetch_registers (regcache, regnum); 308 309 /* If we know, or just found out, that PTRACE_GETREGS does not work, fall 310 back to PTRACE_PEEKUSER. */ 311 if (!have_ptrace_regsets) 312 super_fetch_registers (regcache, regnum); 313} 314 315/* Store REGNO (or all registers if REGNO == -1) to the target 316 using any working method. */ 317 318static void 319mips64_linux_store_registers (struct regcache *regcache, int regnum) 320{ 321 /* Unless we already know that PTRACE_GETREGS does not work, try it. */ 322 if (have_ptrace_regsets) 323 mips64_linux_regsets_store_registers (regcache, regnum); 324 325 /* If we know, or just found out, that PTRACE_GETREGS does not work, fall 326 back to PTRACE_PEEKUSER. */ 327 if (!have_ptrace_regsets) 328 super_store_registers (regcache, regnum); 329} 330 331/* Return the address in the core dump or inferior of register 332 REGNO. */ 333 334static CORE_ADDR 335mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p) 336{ 337 if (mips_abi_regsize (gdbarch) == 8) 338 return mips64_linux_register_addr (gdbarch, regno, store_p); 339 else 340 return mips_linux_register_addr (gdbarch, regno, store_p); 341} 342 343static LONGEST (*super_xfer_partial) (struct target_ops *, enum target_object, 344 const char *, gdb_byte *, const gdb_byte *, 345 ULONGEST, LONGEST); 346 347static LONGEST 348mips_linux_xfer_partial (struct target_ops *ops, 349 enum target_object object, 350 const char *annex, 351 gdb_byte *readbuf, const gdb_byte *writebuf, 352 ULONGEST offset, LONGEST len) 353{ 354 if (object == TARGET_OBJECT_AVAILABLE_FEATURES) 355 { 356 if (annex != NULL && strcmp (annex, "target.xml") == 0) 357 { 358 /* Report that target registers are a size we know for sure 359 that we can get from ptrace. */ 360 if (_MIPS_SIM == _ABIO32) 361 annex = "mips-linux.xml"; 362 else 363 annex = "mips64-linux.xml"; 364 } 365 366 return xml_builtin_xfer_partial (annex, readbuf, writebuf, offset, len); 367 } 368 369 return super_xfer_partial (ops, object, annex, readbuf, writebuf, 370 offset, len); 371} 372 373void _initialize_mips_linux_nat (void); 374 375void 376_initialize_mips_linux_nat (void) 377{ 378 struct target_ops *t = linux_trad_target (mips_linux_register_u_offset); 379 380 super_fetch_registers = t->to_fetch_registers; 381 super_store_registers = t->to_store_registers; 382 383 t->to_fetch_registers = mips64_linux_fetch_registers; 384 t->to_store_registers = mips64_linux_store_registers; 385 386 /* Override the default to_xfer_partial. */ 387 super_xfer_partial = t->to_xfer_partial; 388 t->to_xfer_partial = mips_linux_xfer_partial; 389 390 linux_nat_add_target (t); 391} 392