gdb/ppc-linux-nat.c

   1 /* PPC linux native support.
   2    Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001
   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, Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "frame.h"
  23 #include "inferior.h"
  24 #include "gdbcore.h"
  25 #include "regcache.h"
  26
  27 #include <sys/types.h>
  28 #include <sys/param.h>
  29 #include <signal.h>
  30 #include <sys/user.h>
  31 #include <sys/ioctl.h>
  32 #include <sys/wait.h>
  33 #include <fcntl.h>
  34 #include <sys/procfs.h>
  35 #include <sys/ptrace.h>
  36
  37 /* Prototypes for supply_gregset etc. */
  38 #include "gregset.h"
  39 #include "ppc-tdep.h"
  40
  41 #ifndef PT_READ_U
  42 #define PT_READ_U PTRACE_PEEKUSR
  43 #endif
  44 #ifndef PT_WRITE_U
  45 #define PT_WRITE_U PTRACE_POKEUSR
  46 #endif
  47
  48 /* Default the type of the ptrace transfer to int.  */
  49 #ifndef PTRACE_XFER_TYPE
  50 #define PTRACE_XFER_TYPE int
  51 #endif
  52
  53 int
  54 kernel_u_size (void)
  55 {
  56   return (sizeof (struct user));
  57 }
  58
  59 /* *INDENT-OFF* */
  60 /* registers layout, as presented by the ptrace interface:
  61 PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  62 PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_R13, PT_R14, PT_R15,
  63 PT_R16, PT_R17, PT_R18, PT_R19, PT_R20, PT_R21, PT_R22, PT_R23,
  64 PT_R24, PT_R25, PT_R26, PT_R27, PT_R28, PT_R29, PT_R30, PT_R31,
  65 PT_FPR0, PT_FPR0 + 2, PT_FPR0 + 4, PT_FPR0 + 6, PT_FPR0 + 8, PT_FPR0 + 10, PT_FPR0 + 12, PT_FPR0 + 14,
  66 PT_FPR0 + 16, PT_FPR0 + 18, PT_FPR0 + 20, PT_FPR0 + 22, PT_FPR0 + 24, PT_FPR0 + 26, PT_FPR0 + 28, PT_FPR0 + 30,
  67 PT_FPR0 + 32, PT_FPR0 + 34, PT_FPR0 + 36, PT_FPR0 + 38, PT_FPR0 + 40, PT_FPR0 + 42, PT_FPR0 + 44, PT_FPR0 + 46,
  68 PT_FPR0 + 48, PT_FPR0 + 50, PT_FPR0 + 52, PT_FPR0 + 54, PT_FPR0 + 56, PT_FPR0 + 58, PT_FPR0 + 60, PT_FPR0 + 62,
  69 PT_NIP, PT_MSR, PT_CCR, PT_LNK, PT_CTR, PT_XER, PT_MQ */
  70 /* *INDENT_ON * */
  71
  72 static int
  73 ppc_register_u_addr (int regno)
  74 {
  75   int u_addr = -1;
  76   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
  77
  78   /* General purpose registers occupy 1 slot each in the buffer */
  79   if (regno >= tdep->ppc_gp0_regnum && regno <= tdep->ppc_gplast_regnum )
  80     u_addr =  ((PT_R0 + regno) * 4);
  81
  82   /* Floating point regs: 2 slots each */
  83   if (regno >= FP0_REGNUM && regno <= FPLAST_REGNUM)
  84     u_addr = ((PT_FPR0 + (regno - FP0_REGNUM) * 2) * 4);
  85
  86   /* UISA special purpose registers: 1 slot each */
  87   if (regno == PC_REGNUM)
  88     u_addr = PT_NIP * 4;
  89   if (regno == tdep->ppc_lr_regnum)
  90     u_addr = PT_LNK * 4;
  91   if (regno == tdep->ppc_cr_regnum)
  92     u_addr = PT_CCR * 4;
  93   if (regno == tdep->ppc_xer_regnum)
  94     u_addr = PT_XER * 4;
  95   if (regno == tdep->ppc_ctr_regnum)
  96     u_addr = PT_CTR * 4;
  97   if (regno == tdep->ppc_mq_regnum)
  98     u_addr = PT_MQ * 4;
  99   if (regno == tdep->ppc_ps_regnum)
 100     u_addr = PT_MSR * 4;
 101
 102   return u_addr;
 103 }
 104
 105 static int
 106 ppc_ptrace_cannot_fetch_store_register (int regno)
 107 {
 108   return (ppc_register_u_addr (regno) == -1);
 109 }
 110
 111 static void
 112 fetch_register (int regno)
 113 {
 114   /* This isn't really an address.  But ptrace thinks of it as one.  */
 115   char mess[128];              /* For messages */
 116   register int i;
 117   unsigned int offset;         /* Offset of registers within the u area. */
 118   char *buf = alloca (MAX_REGISTER_RAW_SIZE);
 119   int tid;
 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   /* Overload thread id onto process id */
 130   if ((tid = TIDGET (inferior_ptid)) == 0)
 131     tid = PIDGET (inferior_ptid);      /* no thread id, just use process id */
 132
 133   for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
 134     {
 135       errno = 0;
 136       *(PTRACE_XFER_TYPE *) & buf[i] = ptrace (PT_READ_U, tid,
 137                                                (PTRACE_ARG3_TYPE) regaddr, 0);
 138       regaddr += sizeof (PTRACE_XFER_TYPE);
 139       if (errno != 0)
 140         {
 141           sprintf (mess, "reading register %s (#%d)",
 142                    REGISTER_NAME (regno), regno);
 143           perror_with_name (mess);
 144         }
 145     }
 146   supply_register (regno, buf);
 147 }
 148
 149 static void
 150 fetch_ppc_registers (void)
 151 {
 152   int i;
 153   int last_register = gdbarch_tdep (current_gdbarch)->ppc_mq_regnum;
 154
 155   for (i = 0; i <= last_register; i++)
 156     fetch_register (i);
 157 }
 158
 159 /* Fetch registers from the child process.  Fetch all registers if
 160    regno == -1, otherwise fetch all general registers or all floating
 161    point registers depending upon the value of regno.  */
 162 void
 163 fetch_inferior_registers (int regno)
 164 {
 165   if (regno == -1)
 166     fetch_ppc_registers ();
 167   else
 168     fetch_register (regno);
 169 }
 170
 171 /* Store one register. */
 172 static void
 173 store_register (int regno)
 174 {
 175   /* This isn't really an address.  But ptrace thinks of it as one.  */
 176   CORE_ADDR regaddr = ppc_register_u_addr (regno);
 177   char mess[128];              /* For messages */
 178   register int i;
 179   unsigned int offset;         /* Offset of registers within the u area.  */
 180   int tid;
 181   char *buf = alloca (MAX_REGISTER_RAW_SIZE);
 182
 183   if (regaddr == -1)
 184     {
 185       return;
 186     }
 187
 188   /* Overload thread id onto process id */
 189   if ((tid = TIDGET (inferior_ptid)) == 0)
 190     tid = PIDGET (inferior_ptid);      /* no thread id, just use process id */
 191
 192   regcache_collect (regno, buf);
 193   for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
 194     {
 195       errno = 0;
 196       ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr,
 197               *(PTRACE_XFER_TYPE *) & buf[i]);
 198       regaddr += sizeof (PTRACE_XFER_TYPE);
 199       if (errno != 0)
 200         {
 201           sprintf (mess, "writing register %s (#%d)",
 202                    REGISTER_NAME (regno), regno);
 203           perror_with_name (mess);
 204         }
 205     }
 206 }
 207
 208 static void
 209 store_ppc_registers (void)
 210 {
 211   int i;
 212   int last_register = gdbarch_tdep (current_gdbarch)->ppc_mq_regnum;
 213
 214   for (i = 0; i <= last_register; i++)
 215     store_register (i);
 216 }
 217
 218 void
 219 store_inferior_registers (int regno)
 220 {
 221   if (regno >= 0)
 222     store_register (regno);
 223   else
 224     store_ppc_registers ();
 225 }
 226
 227 void
 228 supply_gregset (gdb_gregset_t *gregsetp)
 229 {
 230   int regi;
 231   register elf_greg_t *regp = (elf_greg_t *) gregsetp;
 232   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 233
 234   for (regi = 0; regi < 32; regi++)
 235     supply_register (regi, (char *) (regp + regi));
 236
 237   supply_register (PC_REGNUM, (char *) (regp + PT_NIP));
 238   supply_register (tdep->ppc_lr_regnum, (char *) (regp + PT_LNK));
 239   supply_register (tdep->ppc_cr_regnum, (char *) (regp + PT_CCR));
 240   supply_register (tdep->ppc_xer_regnum, (char *) (regp + PT_XER));
 241   supply_register (tdep->ppc_ctr_regnum, (char *) (regp + PT_CTR));
 242   supply_register (tdep->ppc_mq_regnum, (char *) (regp + PT_MQ));
 243   supply_register (tdep->ppc_ps_regnum, (char *) (regp + PT_MSR));
 244 }
 245
 246 void
 247 fill_gregset (gdb_gregset_t *gregsetp, int regno)
 248 {
 249   int regi;
 250   elf_greg_t *regp = (elf_greg_t *) gregsetp;
 251   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 252
 253   for (regi = 0; regi < 32; regi++)
 254     {
 255       if ((regno == -1) || regno == regi)
 256         regcache_collect (regi, regp + PT_R0 + regi);
 257     }
 258
 259   if ((regno == -1) || regno == PC_REGNUM)
 260     regcache_collect (PC_REGNUM, regp + PT_NIP);
 261   if ((regno == -1)
 262       || regno == tdep->ppc_lr_regnum)
 263     regcache_collect (tdep->ppc_lr_regnum, regp + PT_LNK);
 264   if ((regno == -1)
 265       || regno == tdep->ppc_cr_regnum)
 266     regcache_collect (tdep->ppc_cr_regnum, regp + PT_CCR);
 267   if ((regno == -1)
 268       || regno == tdep->ppc_xer_regnum)
 269     regcache_collect (tdep->ppc_xer_regnum, regp + PT_XER);
 270   if ((regno == -1)
 271       || regno == tdep->ppc_ctr_regnum)
 272     regcache_collect (tdep->ppc_ctr_regnum, regp + PT_CTR);
 273   if ((regno == -1)
 274       || regno == tdep->ppc_mq_regnum)
 275     regcache_collect (tdep->ppc_mq_regnum, regp + PT_MQ);
 276   if ((regno == -1)
 277       || regno == tdep->ppc_ps_regnum)
 278     regcache_collect (tdep->ppc_ps_regnum, regp + PT_MSR);
 279 }
 280
 281 void
 282 supply_fpregset (gdb_fpregset_t * fpregsetp)
 283 {
 284   int regi;
 285   for (regi = 0; regi < 32; regi++)
 286     {
 287       supply_register (FP0_REGNUM + regi, (char *) (*fpregsetp + regi));
 288     }
 289 }
 290
 291 /*  Given a pointer to a floating point register set in /proc format
 292    (fpregset_t *), update the register specified by REGNO from gdb's idea
 293    of the current floating point register set.  If REGNO is -1, update
 294    them all. */
 295
 296 void
 297 fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
 298 {
 299   int regi;
 300
 301   for (regi = 0; regi < 32; regi++)
 302     {
 303       if ((regno == -1) || (regno == FP0_REGNUM + regi))
 304         regcache_collect (FP0_REGNUM + regi, (char *) (*fpregsetp + regi));
 305     }
 306 }