gdb/ppc-linux-nat.c

   1 /* PPC linux native support.
   2    Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "frame.h"
  24 #include "inferior.h"
  25 #include "gdbcore.h"
  26 #include "regcache.h"
  27
  28 #include <sys/types.h>
  29 #include <sys/param.h>
  30 #include <signal.h>
  31 #include <sys/user.h>
  32 #include <sys/ioctl.h>
  33 #include <sys/wait.h>
  34 #include <fcntl.h>
  35 #include <sys/procfs.h>
  36 #include <sys/ptrace.h>
  37
  38 /* Prototypes for supply_gregset etc. */
  39 #include "gregset.h"
  40 #include "ppc-tdep.h"
  41
  42 #ifndef PT_READ_U
  43 #define PT_READ_U PTRACE_PEEKUSR
  44 #endif
  45 #ifndef PT_WRITE_U
  46 #define PT_WRITE_U PTRACE_POKEUSR
  47 #endif
  48
  49 /* Default the type of the ptrace transfer to int.  */
  50 #ifndef PTRACE_XFER_TYPE
  51 #define PTRACE_XFER_TYPE int
  52 #endif
  53
  54 int
  55 kernel_u_size (void)
  56 {
  57   return (sizeof (struct user));
  58 }
  59
  60 /* *INDENT-OFF* */
  61 /* registers layout, as presented by the ptrace interface:
  62 PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  63 PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_R13, PT_R14, PT_R15,
  64 PT_R16, PT_R17, PT_R18, PT_R19, PT_R20, PT_R21, PT_R22, PT_R23,
  65 PT_R24, PT_R25, PT_R26, PT_R27, PT_R28, PT_R29, PT_R30, PT_R31,
  66 PT_FPR0, PT_FPR0 + 2, PT_FPR0 + 4, PT_FPR0 + 6, PT_FPR0 + 8, PT_FPR0 + 10, PT_FPR0 + 12, PT_FPR0 + 14,
  67 PT_FPR0 + 16, PT_FPR0 + 18, PT_FPR0 + 20, PT_FPR0 + 22, PT_FPR0 + 24, PT_FPR0 + 26, PT_FPR0 + 28, PT_FPR0 + 30,
  68 PT_FPR0 + 32, PT_FPR0 + 34, PT_FPR0 + 36, PT_FPR0 + 38, PT_FPR0 + 40, PT_FPR0 + 42, PT_FPR0 + 44, PT_FPR0 + 46,
  69 PT_FPR0 + 48, PT_FPR0 + 50, PT_FPR0 + 52, PT_FPR0 + 54, PT_FPR0 + 56, PT_FPR0 + 58, PT_FPR0 + 60, PT_FPR0 + 62,
  70 PT_NIP, PT_MSR, PT_CCR, PT_LNK, PT_CTR, PT_XER, PT_MQ */
  71 /* *INDENT_ON * */
  72
  73 static int
  74 ppc_register_u_addr (int regno)
  75 {
  76   int u_addr = -1;
  77   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
  78
  79   /* General purpose registers occupy 1 slot each in the buffer */
  80   if (regno >= tdep->ppc_gp0_regnum && regno <= tdep->ppc_gplast_regnum )
  81     u_addr =  ((PT_R0 + regno) * 4);
  82
  83   /* Floating point regs: 2 slots each */
  84   if (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM)
  85     u_addr = ((PT_FPR0 + (regno - FP0_REGNUM) * 2) * 4);
  86
  87   /* UISA special purpose registers: 1 slot each */
  88   if (regno == PC_REGNUM)
  89     u_addr = PT_NIP * 4;
  90   if (regno == tdep->ppc_lr_regnum)
  91     u_addr = PT_LNK * 4;
  92   if (regno == tdep->ppc_cr_regnum)
  93     u_addr = PT_CCR * 4;
  94   if (regno == tdep->ppc_xer_regnum)
  95     u_addr = PT_XER * 4;
  96   if (regno == tdep->ppc_ctr_regnum)
  97     u_addr = PT_CTR * 4;
  98   if (regno == tdep->ppc_mq_regnum)
  99     u_addr = PT_MQ * 4;
 100   if (regno == tdep->ppc_ps_regnum)
 101     u_addr = PT_MSR * 4;
 102
 103   return u_addr;
 104 }
 105
 106 static int
 107 ppc_ptrace_cannot_fetch_store_register (int regno)
 108 {
 109   return (ppc_register_u_addr (regno) == -1);
 110 }
 111
 112 static void
 113 fetch_register (int tid, int regno)
 114 {
 115   /* This isn't really an address.  But ptrace thinks of it as one.  */
 116   char mess[128];              /* For messages */
 117   register int i;
 118   unsigned int offset;         /* Offset of registers within the u area. */
 119   char *buf = alloca (MAX_REGISTER_RAW_SIZE);
 120   CORE_ADDR regaddr = ppc_register_u_addr (regno);
 121
 122   if (regaddr == -1)
 123     {
 124       memset (buf, '\0', REGISTER_RAW_SIZE (regno));   /* Supply zeroes */
 125       supply_register (regno, buf);
 126       return;
 127     }
 128
 129   for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
 130     {
 131       errno = 0;
 132       *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid,
 133                                                (PTRACE_ARG3_TYPE) regaddr, 0);
 134       regaddr += sizeof (PTRACE_XFER_TYPE);
 135       if (errno != 0)
 136         {
 137           sprintf (mess, "reading register %s (#%d)",
 138                    REGISTER_NAME (regno), regno);
 139           perror_with_name (mess);
 140         }
 141     }
 142   supply_register (regno, buf);
 143 }
 144
 145 static void
 146 fetch_ppc_registers (int tid)
 147 {
 148   int i;
 149   int last_register = gdbarch_tdep (current_gdbarch)->ppc_mq_regnum;
 150
 151   for (i = 0; i <= last_register; i++)
 152     fetch_register (tid, i);
 153 }
 154
 155 /* Fetch registers from the child process.  Fetch all registers if
 156    regno == -1, otherwise fetch all general registers or all floating
 157    point registers depending upon the value of regno.  */
 158 void
 159 fetch_inferior_registers (int regno)
 160 {
 161  /* Overload thread id onto process id */
 162   int tid = TIDGET (inferior_ptid);
 163
 164   /* No thread id, just use process id */
 165   if (tid == 0)
 166     tid = PIDGET (inferior_ptid);
 167
 168    if (regno == -1)
 169     fetch_ppc_registers (tid);
 170   else
 171     fetch_register (tid, regno);
 172 }
 173
 174 /* Store one register. */
 175 static void
 176 store_register (int tid, int regno)
 177 {
 178   /* This isn't really an address.  But ptrace thinks of it as one.  */
 179   CORE_ADDR regaddr = ppc_register_u_addr (regno);
 180   char mess[128];              /* For messages */
 181   register int i;
 182   unsigned int offset;         /* Offset of registers within the u area.  */
 183   char *buf = alloca (MAX_REGISTER_RAW_SIZE);
 184
 185   if (regaddr == -1)
 186     {
 187       return;
 188     }
 189
 190   regcache_collect (regno, buf);
 191   for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
 192     {
 193       errno = 0;
 194       ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr,
 195               *(PTRACE_XFER_TYPE *) & buf[i]);
 196       regaddr += sizeof (PTRACE_XFER_TYPE);
 197       if (errno != 0)
 198         {
 199           sprintf (mess, "writing register %s (#%d)",
 200                    REGISTER_NAME (regno), regno);
 201           perror_with_name (mess);
 202         }
 203     }
 204 }
 205
 206 static void
 207 store_ppc_registers (int tid)
 208 {
 209   int i;
 210   int last_register = gdbarch_tdep (current_gdbarch)->ppc_mq_regnum;
 211
 212   for (i = 0; i <= last_register; i++)
 213     store_register (tid, i);
 214 }
 215
 216 void
 217 store_inferior_registers (int regno)
 218 {
 219   /* Overload thread id onto process id */
 220   int tid = TIDGET (inferior_ptid);
 221
 222   /* No thread id, just use process id */
 223   if (tid == 0)
 224     tid = PIDGET (inferior_ptid);
 225
 226   if (regno >= 0)
 227     store_register (tid, regno);
 228   else
 229     store_ppc_registers (tid);
 230 }
 231
 232 void
 233 supply_gregset (gdb_gregset_t *gregsetp)
 234 {
 235   int regi;
 236   register elf_greg_t *regp = (elf_greg_t *) gregsetp;
 237   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 238
 239   for (regi = 0; regi < 32; regi++)
 240     supply_register (regi, (char *) (regp + regi));
 241
 242   supply_register (PC_REGNUM, (char *) (regp + PT_NIP));
 243   supply_register (tdep->ppc_lr_regnum, (char *) (regp + PT_LNK));
 244   supply_register (tdep->ppc_cr_regnum, (char *) (regp + PT_CCR));
 245   supply_register (tdep->ppc_xer_regnum, (char *) (regp + PT_XER));
 246   supply_register (tdep->ppc_ctr_regnum, (char *) (regp + PT_CTR));
 247   supply_register (tdep->ppc_mq_regnum, (char *) (regp + PT_MQ));
 248   supply_register (tdep->ppc_ps_regnum, (char *) (regp + PT_MSR));
 249 }
 250
 251 void
 252 fill_gregset (gdb_gregset_t *gregsetp, int regno)
 253 {
 254   int regi;
 255   elf_greg_t *regp = (elf_greg_t *) gregsetp;
 256   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 257
 258   for (regi = 0; regi < 32; regi++)
 259     {
 260       if ((regno == -1) || regno == regi)
 261         regcache_collect (regi, regp + PT_R0 + regi);
 262     }
 263
 264   if ((regno == -1) || regno == PC_REGNUM)
 265     regcache_collect (PC_REGNUM, regp + PT_NIP);
 266   if ((regno == -1) || regno == tdep->ppc_lr_regnum)
 267     regcache_collect (tdep->ppc_lr_regnum, regp + PT_LNK);
 268   if ((regno == -1) || regno == tdep->ppc_cr_regnum)
 269     regcache_collect (tdep->ppc_cr_regnum, regp + PT_CCR);
 270   if ((regno == -1) || regno == tdep->ppc_xer_regnum)
 271     regcache_collect (tdep->ppc_xer_regnum, regp + PT_XER);
 272   if ((regno == -1) || regno == tdep->ppc_ctr_regnum)
 273     regcache_collect (tdep->ppc_ctr_regnum, regp + PT_CTR);
 274   if ((regno == -1) || regno == tdep->ppc_mq_regnum)
 275     regcache_collect (tdep->ppc_mq_regnum, regp + PT_MQ);
 276   if ((regno == -1) || regno == tdep->ppc_ps_regnum)
 277     regcache_collect (tdep->ppc_ps_regnum, regp + PT_MSR);
 278 }
 279
 280 void
 281 supply_fpregset (gdb_fpregset_t * fpregsetp)
 282 {
 283   int regi;
 284   for (regi = 0; regi < 32; regi++)
 285     supply_register (FP0_REGNUM + regi, (char *) (*fpregsetp + regi));
 286 }
 287
 288 /*  Given a pointer to a floating point register set in /proc format
 289    (fpregset_t *), update the register specified by REGNO from gdb's idea
 290    of the current floating point register set.  If REGNO is -1, update
 291    them all. */
 292
 293 void
 294 fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
 295 {
 296   int regi;
 297
 298   for (regi = 0; regi < 32; regi++)
 299     {
 300       if ((regno == -1) || (regno == FP0_REGNUM + regi))
 301         regcache_collect (FP0_REGNUM + regi, (char *) (*fpregsetp + regi));
 302     }
 303 }