gdb/ppc-linux-nat.c

   1 /* PPC GNU/Linux native support.
   2
   3    Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002,
   4    2003 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 2 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, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include "defs.h"
  24 #include "gdb_string.h"
  25 #include "frame.h"
  26 #include "inferior.h"
  27 #include "gdbcore.h"
  28 #include "regcache.h"
  29 #include "gdb_assert.h"
  30
  31 #include <sys/types.h>
  32 #include <sys/param.h>
  33 #include <signal.h>
  34 #include <sys/user.h>
  35 #include <sys/ioctl.h>
  36 #include "gdb_wait.h"
  37 #include <fcntl.h>
  38 #include <sys/procfs.h>
  39 #include <sys/ptrace.h>
  40
  41 /* Prototypes for supply_gregset etc. */
  42 #include "gregset.h"
  43 #include "ppc-tdep.h"
  44
  45 #ifndef PT_READ_U
  46 #define PT_READ_U PTRACE_PEEKUSR
  47 #endif
  48 #ifndef PT_WRITE_U
  49 #define PT_WRITE_U PTRACE_POKEUSR
  50 #endif
  51
  52 /* Default the type of the ptrace transfer to int.  */
  53 #ifndef PTRACE_XFER_TYPE
  54 #define PTRACE_XFER_TYPE int
  55 #endif
  56
  57 /* Glibc's headers don't define PTRACE_GETVRREGS so we cannot use a
  58    configure time check.  Some older glibc's (for instance 2.2.1)
  59    don't have a specific powerpc version of ptrace.h, and fall back on
  60    a generic one.  In such cases, sys/ptrace.h defines
  61    PTRACE_GETFPXREGS and PTRACE_SETFPXREGS to the same numbers that
  62    ppc kernel's asm/ptrace.h defines PTRACE_GETVRREGS and
  63    PTRACE_SETVRREGS to be.  This also makes a configury check pretty
  64    much useless.  */
  65
  66 /* These definitions should really come from the glibc header files,
  67    but Glibc doesn't know about the vrregs yet.  */
  68 #ifndef PTRACE_GETVRREGS
  69 #define PTRACE_GETVRREGS 18
  70 #define PTRACE_SETVRREGS 19
  71 #endif
  72
  73 /* This oddity is because the Linux kernel defines elf_vrregset_t as
  74    an array of 33 16 bytes long elements.  I.e. it leaves out vrsave.
  75    However the PTRACE_GETVRREGS and PTRACE_SETVRREGS requests return
  76    the vrsave as an extra 4 bytes at the end.  I opted for creating a
  77    flat array of chars, so that it is easier to manipulate for gdb.
  78
  79    There are 32 vector registers 16 bytes longs, plus a VSCR register
  80    which is only 4 bytes long, but is fetched as a 16 bytes
  81    quantity. Up to here we have the elf_vrregset_t structure.
  82    Appended to this there is space for the VRSAVE register: 4 bytes.
  83    Even though this vrsave register is not included in the regset
  84    typedef, it is handled by the ptrace requests.
  85
  86    Note that GNU/Linux doesn't support little endian PPC hardware,
  87    therefore the offset at which the real value of the VSCR register
  88    is located will be always 12 bytes.
  89
  90    The layout is like this (where x is the actual value of the vscr reg): */
  91
  92 /* *INDENT-OFF* */
  93 /*
  94    |.|.|.|.|.....|.|.|.|.||.|.|.|x||.|
  95    <------->     <-------><-------><->
  96      VR0           VR31     VSCR    VRSAVE
  97 */
  98 /* *INDENT-ON* */
  99
 100 #define SIZEOF_VRREGS 33*16+4
 101
 102 typedef char gdb_vrregset_t[SIZEOF_VRREGS];
 103
 104 /* For runtime check of ptrace support for VRREGS.  */
 105 int have_ptrace_getvrregs = 1;
 106
 107 int
 108 kernel_u_size (void)
 109 {
 110   return (sizeof (struct user));
 111 }
 112
 113 /* *INDENT-OFF* */
 114 /* registers layout, as presented by the ptrace interface:
 115 PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
 116 PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_R13, PT_R14, PT_R15,
 117 PT_R16, PT_R17, PT_R18, PT_R19, PT_R20, PT_R21, PT_R22, PT_R23,
 118 PT_R24, PT_R25, PT_R26, PT_R27, PT_R28, PT_R29, PT_R30, PT_R31,
 119 PT_FPR0, PT_FPR0 + 2, PT_FPR0 + 4, PT_FPR0 + 6, PT_FPR0 + 8, PT_FPR0 + 10, PT_FPR0 + 12, PT_FPR0 + 14,
 120 PT_FPR0 + 16, PT_FPR0 + 18, PT_FPR0 + 20, PT_FPR0 + 22, PT_FPR0 + 24, PT_FPR0 + 26, PT_FPR0 + 28, PT_FPR0 + 30,
 121 PT_FPR0 + 32, PT_FPR0 + 34, PT_FPR0 + 36, PT_FPR0 + 38, PT_FPR0 + 40, PT_FPR0 + 42, PT_FPR0 + 44, PT_FPR0 + 46,
 122 PT_FPR0 + 48, PT_FPR0 + 50, PT_FPR0 + 52, PT_FPR0 + 54, PT_FPR0 + 56, PT_FPR0 + 58, PT_FPR0 + 60, PT_FPR0 + 62,
 123 PT_NIP, PT_MSR, PT_CCR, PT_LNK, PT_CTR, PT_XER, PT_MQ */
 124 /* *INDENT_ON * */
 125
 126 static int
 127 ppc_register_u_addr (int regno)
 128 {
 129   int u_addr = -1;
 130   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 131   /* NOTE: cagney/2003-11-25: This is the word size used by the ptrace
 132      interface, and not the wordsize of the program's ABI.  */
 133   int wordsize = sizeof (PTRACE_XFER_TYPE);
 134
 135   /* General purpose registers occupy 1 slot each in the buffer */
 136   if (regno >= tdep->ppc_gp0_regnum
 137       && regno < tdep->ppc_gp0_regnum + ppc_num_gprs)
 138     u_addr = ((regno - tdep->ppc_gp0_regnum + PT_R0) * wordsize);
 139
 140   /* Floating point regs: eight bytes each in both 32- and 64-bit
 141      ptrace interfaces.  Thus, two slots each in 32-bit interface, one
 142      slot each in 64-bit interface.  */
 143   if (tdep->ppc_fp0_regnum >= 0
 144       && regno >= tdep->ppc_fp0_regnum
 145       && regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
 146     u_addr = (PT_FPR0 * wordsize) + ((regno - tdep->ppc_fp0_regnum) * 8);
 147
 148   /* UISA special purpose registers: 1 slot each */
 149   if (regno == PC_REGNUM)
 150     u_addr = PT_NIP * wordsize;
 151   if (regno == tdep->ppc_lr_regnum)
 152     u_addr = PT_LNK * wordsize;
 153   if (regno == tdep->ppc_cr_regnum)
 154     u_addr = PT_CCR * wordsize;
 155   if (regno == tdep->ppc_xer_regnum)
 156     u_addr = PT_XER * wordsize;
 157   if (regno == tdep->ppc_ctr_regnum)
 158     u_addr = PT_CTR * wordsize;
 159 #ifdef PT_MQ
 160   if (regno == tdep->ppc_mq_regnum)
 161     u_addr = PT_MQ * wordsize;
 162 #endif
 163   if (regno == tdep->ppc_ps_regnum)
 164     u_addr = PT_MSR * wordsize;
 165   if (tdep->ppc_fpscr_regnum >= 0
 166       && regno == tdep->ppc_fpscr_regnum)
 167     u_addr = PT_FPSCR * wordsize;
 168
 169   return u_addr;
 170 }
 171
 172 /* The Linux kernel ptrace interface for AltiVec registers uses the
 173    registers set mechanism, as opposed to the interface for all the
 174    other registers, that stores/fetches each register individually.  */
 175 static void
 176 fetch_altivec_register (int tid, int regno)
 177 {
 178   int ret;
 179   int offset = 0;
 180   gdb_vrregset_t regs;
 181   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 182   int vrregsize = DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
 183
 184   ret = ptrace (PTRACE_GETVRREGS, tid, 0, &regs);
 185   if (ret < 0)
 186     {
 187       if (errno == EIO)
 188         {
 189           have_ptrace_getvrregs = 0;
 190           return;
 191         }
 192       perror_with_name ("Unable to fetch AltiVec register");
 193     }
 194
 195   /* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes
 196      long on the hardware.  We deal only with the lower 4 bytes of the
 197      vector.  VRSAVE is at the end of the array in a 4 bytes slot, so
 198      there is no need to define an offset for it.  */
 199   if (regno == (tdep->ppc_vrsave_regnum - 1))
 200     offset = vrregsize - DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum);
 201
 202   supply_register (regno,
 203                    regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset);
 204 }
 205
 206 static void
 207 fetch_register (int tid, int regno)
 208 {
 209   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 210   /* This isn't really an address.  But ptrace thinks of it as one.  */
 211   CORE_ADDR regaddr = ppc_register_u_addr (regno);
 212   int bytes_transferred;
 213   unsigned int offset;         /* Offset of registers within the u area. */
 214   char buf[MAX_REGISTER_SIZE];
 215
 216   if (altivec_register_p (regno))
 217     {
 218       /* If this is the first time through, or if it is not the first
 219          time through, and we have comfirmed that there is kernel
 220          support for such a ptrace request, then go and fetch the
 221          register.  */
 222       if (have_ptrace_getvrregs)
 223        {
 224          fetch_altivec_register (tid, regno);
 225          return;
 226        }
 227      /* If we have discovered that there is no ptrace support for
 228         AltiVec registers, fall through and return zeroes, because
 229         regaddr will be -1 in this case.  */
 230     }
 231
 232   if (regaddr == -1)
 233     {
 234       memset (buf, '\0', DEPRECATED_REGISTER_RAW_SIZE (regno));   /* Supply zeroes */
 235       supply_register (regno, buf);
 236       return;
 237     }
 238
 239   /* Read the raw register using PTRACE_XFER_TYPE sized chunks.  On a
 240      32-bit platform, 64-bit floating-point registers will require two
 241      transfers.  */
 242   for (bytes_transferred = 0;
 243        bytes_transferred < register_size (current_gdbarch, regno);
 244        bytes_transferred += sizeof (PTRACE_XFER_TYPE))
 245     {
 246       errno = 0;
 247       *(PTRACE_XFER_TYPE *) & buf[bytes_transferred]
 248         = ptrace (PT_READ_U, tid, (PTRACE_ARG3_TYPE) regaddr, 0);
 249       regaddr += sizeof (PTRACE_XFER_TYPE);
 250       if (errno != 0)
 251         {
 252           char message[128];
 253           sprintf (message, "reading register %s (#%d)",
 254                    REGISTER_NAME (regno), regno);
 255           perror_with_name (message);
 256         }
 257     }
 258
 259   /* Now supply the register.  Keep in mind that the regcache's idea
 260      of the register's size may not be a multiple of sizeof
 261      (PTRACE_XFER_TYPE).  */
 262   if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_LITTLE)
 263     {
 264       /* Little-endian values are always found at the left end of the
 265          bytes transferred.  */
 266       regcache_raw_supply (current_regcache, regno, buf);
 267     }
 268   else if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG)
 269     {
 270       /* Big-endian values are found at the right end of the bytes
 271          transferred.  */
 272       size_t padding = (bytes_transferred
 273                         - register_size (current_gdbarch, regno));
 274       regcache_raw_supply (current_regcache, regno, buf + padding);
 275     }
 276   else
 277     gdb_assert (0);
 278 }
 279
 280 static void
 281 supply_vrregset (gdb_vrregset_t *vrregsetp)
 282 {
 283   int i;
 284   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 285   int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1;
 286   int vrregsize = DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
 287   int offset = vrregsize - DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum);
 288
 289   for (i = 0; i < num_of_vrregs; i++)
 290     {
 291       /* The last 2 registers of this set are only 32 bit long, not
 292          128.  However an offset is necessary only for VSCR because it
 293          occupies a whole vector, while VRSAVE occupies a full 4 bytes
 294          slot.  */
 295       if (i == (num_of_vrregs - 2))
 296         supply_register (tdep->ppc_vr0_regnum + i,
 297                          *vrregsetp + i * vrregsize + offset);
 298       else
 299         supply_register (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize);
 300     }
 301 }
 302
 303 static void
 304 fetch_altivec_registers (int tid)
 305 {
 306   int ret;
 307   gdb_vrregset_t regs;
 308
 309   ret = ptrace (PTRACE_GETVRREGS, tid, 0, &regs);
 310   if (ret < 0)
 311     {
 312       if (errno == EIO)
 313         {
 314           have_ptrace_getvrregs = 0;
 315           return;
 316         }
 317       perror_with_name ("Unable to fetch AltiVec registers");
 318     }
 319   supply_vrregset (&regs);
 320 }
 321
 322 static void
 323 fetch_ppc_registers (int tid)
 324 {
 325   int i;
 326   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 327
 328   for (i = 0; i < ppc_num_gprs; i++)
 329     fetch_register (tid, tdep->ppc_gp0_regnum + i);
 330   if (tdep->ppc_fp0_regnum >= 0)
 331     for (i = 0; i < ppc_num_fprs; i++)
 332       fetch_register (tid, tdep->ppc_fp0_regnum + i);
 333   fetch_register (tid, PC_REGNUM);
 334   if (tdep->ppc_ps_regnum != -1)
 335     fetch_register (tid, tdep->ppc_ps_regnum);
 336   if (tdep->ppc_cr_regnum != -1)
 337     fetch_register (tid, tdep->ppc_cr_regnum);
 338   if (tdep->ppc_lr_regnum != -1)
 339     fetch_register (tid, tdep->ppc_lr_regnum);
 340   if (tdep->ppc_ctr_regnum != -1)
 341     fetch_register (tid, tdep->ppc_ctr_regnum);
 342   if (tdep->ppc_xer_regnum != -1)
 343     fetch_register (tid, tdep->ppc_xer_regnum);
 344   if (tdep->ppc_mq_regnum != -1)
 345     fetch_register (tid, tdep->ppc_mq_regnum);
 346   if (tdep->ppc_fpscr_regnum != -1)
 347     fetch_register (tid, tdep->ppc_fpscr_regnum);
 348   if (have_ptrace_getvrregs)
 349     if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1)
 350       fetch_altivec_registers (tid);
 351 }
 352
 353 /* Fetch registers from the child process.  Fetch all registers if
 354    regno == -1, otherwise fetch all general registers or all floating
 355    point registers depending upon the value of regno.  */
 356 void
 357 fetch_inferior_registers (int regno)
 358 {
 359   /* Overload thread id onto process id */
 360   int tid = TIDGET (inferior_ptid);
 361
 362   /* No thread id, just use process id */
 363   if (tid == 0)
 364     tid = PIDGET (inferior_ptid);
 365
 366   if (regno == -1)
 367     fetch_ppc_registers (tid);
 368   else
 369     fetch_register (tid, regno);
 370 }
 371
 372 /* Store one register. */
 373 static void
 374 store_altivec_register (int tid, int regno)
 375 {
 376   int ret;
 377   int offset = 0;
 378   gdb_vrregset_t regs;
 379   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 380   int vrregsize = DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
 381
 382   ret = ptrace (PTRACE_GETVRREGS, tid, 0, &regs);
 383   if (ret < 0)
 384     {
 385       if (errno == EIO)
 386         {
 387           have_ptrace_getvrregs = 0;
 388           return;
 389         }
 390       perror_with_name ("Unable to fetch AltiVec register");
 391     }
 392
 393   /* VSCR is fetched as a 16 bytes quantity, but it is really 4 bytes
 394      long on the hardware.  */
 395   if (regno == (tdep->ppc_vrsave_regnum - 1))
 396     offset = vrregsize - DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum);
 397
 398   regcache_collect (regno,
 399                     regs + (regno - tdep->ppc_vr0_regnum) * vrregsize + offset);
 400
 401   ret = ptrace (PTRACE_SETVRREGS, tid, 0, &regs);
 402   if (ret < 0)
 403     perror_with_name ("Unable to store AltiVec register");
 404 }
 405
 406 static void
 407 store_register (int tid, int regno)
 408 {
 409   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 410   /* This isn't really an address.  But ptrace thinks of it as one.  */
 411   CORE_ADDR regaddr = ppc_register_u_addr (regno);
 412   int i;
 413   size_t bytes_to_transfer;
 414   char buf[MAX_REGISTER_SIZE];
 415
 416   if (altivec_register_p (regno))
 417     {
 418       store_altivec_register (tid, regno);
 419       return;
 420     }
 421
 422   if (regaddr == -1)
 423     return;
 424
 425   /* First collect the register.  Keep in mind that the regcache's
 426      idea of the register's size may not be a multiple of sizeof
 427      (PTRACE_XFER_TYPE).  */
 428   memset (buf, 0, sizeof buf);
 429   bytes_to_transfer = align_up (register_size (current_gdbarch, regno),
 430                                 sizeof (PTRACE_XFER_TYPE));
 431   if (TARGET_BYTE_ORDER == BFD_ENDIAN_LITTLE)
 432     {
 433       /* Little-endian values always sit at the left end of the buffer.  */
 434       regcache_raw_collect (current_regcache, regno, buf);
 435     }
 436   else if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
 437     {
 438       /* Big-endian values sit at the right end of the buffer.  */
 439       size_t padding = (bytes_to_transfer
 440                         - register_size (current_gdbarch, regno));
 441       regcache_raw_collect (current_regcache, regno, buf + padding);
 442     }
 443
 444   for (i = 0; i < bytes_to_transfer; i += sizeof (PTRACE_XFER_TYPE))
 445     {
 446       errno = 0;
 447       ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr,
 448               *(PTRACE_XFER_TYPE *) & buf[i]);
 449       regaddr += sizeof (PTRACE_XFER_TYPE);
 450
 451       if (errno == EIO
 452           && regno == tdep->ppc_fpscr_regnum)
 453         {
 454           /* Some older kernel versions don't allow fpscr to be written.  */
 455           continue;
 456         }
 457
 458       if (errno != 0)
 459         {
 460           char message[128];
 461           sprintf (message, "writing register %s (#%d)",
 462                    REGISTER_NAME (regno), regno);
 463           perror_with_name (message);
 464         }
 465     }
 466 }
 467
 468 static void
 469 fill_vrregset (gdb_vrregset_t *vrregsetp)
 470 {
 471   int i;
 472   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 473   int num_of_vrregs = tdep->ppc_vrsave_regnum - tdep->ppc_vr0_regnum + 1;
 474   int vrregsize = DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vr0_regnum);
 475   int offset = vrregsize - DEPRECATED_REGISTER_RAW_SIZE (tdep->ppc_vrsave_regnum);
 476
 477   for (i = 0; i < num_of_vrregs; i++)
 478     {
 479       /* The last 2 registers of this set are only 32 bit long, not
 480          128, but only VSCR is fetched as a 16 bytes quantity.  */
 481       if (i == (num_of_vrregs - 2))
 482         regcache_collect (tdep->ppc_vr0_regnum + i,
 483                           *vrregsetp + i * vrregsize + offset);
 484       else
 485         regcache_collect (tdep->ppc_vr0_regnum + i, *vrregsetp + i * vrregsize);
 486     }
 487 }
 488
 489 static void
 490 store_altivec_registers (int tid)
 491 {
 492   int ret;
 493   gdb_vrregset_t regs;
 494
 495   ret = ptrace (PTRACE_GETVRREGS, tid, 0, &regs);
 496   if (ret < 0)
 497     {
 498       if (errno == EIO)
 499         {
 500           have_ptrace_getvrregs = 0;
 501           return;
 502         }
 503       perror_with_name ("Couldn't get AltiVec registers");
 504     }
 505
 506   fill_vrregset (&regs);
 507
 508   if (ptrace (PTRACE_SETVRREGS, tid, 0, &regs) < 0)
 509     perror_with_name ("Couldn't write AltiVec registers");
 510 }
 511
 512 static void
 513 store_ppc_registers (int tid)
 514 {
 515   int i;
 516   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 517
 518   for (i = 0; i < ppc_num_gprs; i++)
 519     store_register (tid, tdep->ppc_gp0_regnum + i);
 520   if (tdep->ppc_fp0_regnum >= 0)
 521     for (i = 0; i < ppc_num_fprs; i++)
 522       store_register (tid, tdep->ppc_fp0_regnum + i);
 523   store_register (tid, PC_REGNUM);
 524   if (tdep->ppc_ps_regnum != -1)
 525     store_register (tid, tdep->ppc_ps_regnum);
 526   if (tdep->ppc_cr_regnum != -1)
 527     store_register (tid, tdep->ppc_cr_regnum);
 528   if (tdep->ppc_lr_regnum != -1)
 529     store_register (tid, tdep->ppc_lr_regnum);
 530   if (tdep->ppc_ctr_regnum != -1)
 531     store_register (tid, tdep->ppc_ctr_regnum);
 532   if (tdep->ppc_xer_regnum != -1)
 533     store_register (tid, tdep->ppc_xer_regnum);
 534   if (tdep->ppc_mq_regnum != -1)
 535     store_register (tid, tdep->ppc_mq_regnum);
 536   if (tdep->ppc_fpscr_regnum != -1)
 537     store_register (tid, tdep->ppc_fpscr_regnum);
 538   if (have_ptrace_getvrregs)
 539     if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1)
 540       store_altivec_registers (tid);
 541 }
 542
 543 void
 544 store_inferior_registers (int regno)
 545 {
 546   /* Overload thread id onto process id */
 547   int tid = TIDGET (inferior_ptid);
 548
 549   /* No thread id, just use process id */
 550   if (tid == 0)
 551     tid = PIDGET (inferior_ptid);
 552
 553   if (regno >= 0)
 554     store_register (tid, regno);
 555   else
 556     store_ppc_registers (tid);
 557 }
 558
 559 void
 560 supply_gregset (gdb_gregset_t *gregsetp)
 561 {
 562   /* NOTE: cagney/2003-11-25: This is the word size used by the ptrace
 563      interface, and not the wordsize of the program's ABI.  */
 564   int wordsize = sizeof (PTRACE_XFER_TYPE);
 565   ppc_linux_supply_gregset (current_regcache, -1, gregsetp,
 566                             sizeof (gdb_gregset_t), wordsize);
 567 }
 568
 569 static void
 570 right_fill_reg (int regnum, void *reg)
 571 {
 572   /* NOTE: cagney/2003-11-25: This is the word size used by the ptrace
 573      interface, and not the wordsize of the program's ABI.  */
 574   int wordsize = sizeof (PTRACE_XFER_TYPE);
 575   /* Right fill the register.  */
 576   regcache_raw_collect (current_regcache, regnum,
 577                         ((bfd_byte *) reg
 578                          + wordsize
 579                          - register_size (current_gdbarch, regnum)));
 580 }
 581
 582 void
 583 fill_gregset (gdb_gregset_t *gregsetp, int regno)
 584 {
 585   int regi;
 586   elf_greg_t *regp = (elf_greg_t *) gregsetp;
 587   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 588   const int elf_ngreg = 48;
 589
 590
 591   /* Start with zeros.  */
 592   memset (regp, 0, elf_ngreg * sizeof (*regp));
 593
 594   for (regi = 0; regi < ppc_num_gprs; regi++)
 595     {
 596       if ((regno == -1) || regno == tdep->ppc_gp0_regnum + regi)
 597         right_fill_reg (tdep->ppc_gp0_regnum + regi, (regp + PT_R0 + regi));
 598     }
 599
 600   if ((regno == -1) || regno == PC_REGNUM)
 601     right_fill_reg (PC_REGNUM, regp + PT_NIP);
 602   if ((regno == -1) || regno == tdep->ppc_lr_regnum)
 603     right_fill_reg (tdep->ppc_lr_regnum, regp + PT_LNK);
 604   if ((regno == -1) || regno == tdep->ppc_cr_regnum)
 605     regcache_collect (tdep->ppc_cr_regnum, regp + PT_CCR);
 606   if ((regno == -1) || regno == tdep->ppc_xer_regnum)
 607     regcache_collect (tdep->ppc_xer_regnum, regp + PT_XER);
 608   if ((regno == -1) || regno == tdep->ppc_ctr_regnum)
 609     right_fill_reg (tdep->ppc_ctr_regnum, regp + PT_CTR);
 610 #ifdef PT_MQ
 611   if (((regno == -1) || regno == tdep->ppc_mq_regnum)
 612       && (tdep->ppc_mq_regnum != -1))
 613     right_fill_reg (tdep->ppc_mq_regnum, regp + PT_MQ);
 614 #endif
 615   if ((regno == -1) || regno == tdep->ppc_ps_regnum)
 616     right_fill_reg (tdep->ppc_ps_regnum, regp + PT_MSR);
 617 }
 618
 619 void
 620 supply_fpregset (gdb_fpregset_t * fpregsetp)
 621 {
 622   ppc_linux_supply_fpregset (NULL, current_regcache, -1, fpregsetp,
 623                              sizeof (gdb_fpregset_t));
 624 }
 625
 626 /* Given a pointer to a floating point register set in /proc format
 627    (fpregset_t *), update the register specified by REGNO from gdb's
 628    idea of the current floating point register set.  If REGNO is -1,
 629    update them all.  */
 630 void
 631 fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
 632 {
 633   int regi;
 634   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 635   bfd_byte *fpp = (void *) fpregsetp;
 636
 637   if (ppc_floating_point_unit_p (current_gdbarch))
 638     {
 639       for (regi = 0; regi < ppc_num_fprs; regi++)
 640         {
 641           if ((regno == -1) || (regno == tdep->ppc_fp0_regnum + regi))
 642             regcache_collect (tdep->ppc_fp0_regnum + regi, fpp + 8 * regi);
 643         }
 644       if (regno == -1 || regno == tdep->ppc_fpscr_regnum)
 645         right_fill_reg (tdep->ppc_fpscr_regnum, (fpp + 8 * 32));
 646     }
 647 }