gdb/irix5-nat.c

   1 /* Native support for the SGI Iris running IRIX version 5, for GDB.
   2
   3    Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
   4    1999, 2000, 2001, 2002, 2004, 2006, 2007 Free Software Foundation, Inc.
   5
   6    Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
   7    and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
   8    Implemented for Irix 4.x by Garrett A. Wollman.
   9    Modified for Irix 5.x by Ian Lance Taylor.
  10
  11    This file is part of GDB.
  12
  13    This program is free software; you can redistribute it and/or modify
  14    it under the terms of the GNU General Public License as published by
  15    the Free Software Foundation; either version 3 of the License, or
  16    (at your option) any later version.
  17
  18    This program is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21    GNU General Public License for more details.
  22
  23    You should have received a copy of the GNU General Public License
  24    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  25
  26 #include "defs.h"
  27 #include "inferior.h"
  28 #include "gdbcore.h"
  29 #include "target.h"
  30 #include "regcache.h"
  31
  32 #include "gdb_string.h"
  33 #include <sys/time.h>
  34 #include <sys/procfs.h>
  35 #include <setjmp.h>             /* For JB_XXX.  */
  36
  37 /* Prototypes for supply_gregset etc. */
  38 #include "gregset.h"
  39 #include "mips-tdep.h"
  40
  41 static void fetch_core_registers (struct regcache *, char *,
  42                                   unsigned int, int, CORE_ADDR);
  43
  44
  45 /*
  46  * See the comment in m68k-tdep.c regarding the utility of these functions.
  47  *
  48  * These definitions are from the MIPS SVR4 ABI, so they may work for
  49  * any MIPS SVR4 target.
  50  */
  51
  52 void
  53 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
  54 {
  55   int regi;
  56   const greg_t *regp = &(*gregsetp)[0];
  57   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  58   int gregoff = sizeof (greg_t) - mips_isa_regsize (gdbarch);
  59   static char zerobuf[32] = {0};
  60
  61   for (regi = 0; regi <= CTX_RA; regi++)
  62     regcache_raw_supply (regcache, regi,
  63                          (const char *) (regp + regi) + gregoff);
  64
  65   regcache_raw_supply (regcache, mips_regnum (gdbarch)->pc,
  66                        (const char *) (regp + CTX_EPC) + gregoff);
  67   regcache_raw_supply (regcache, mips_regnum (gdbarch)->hi,
  68                        (const char *) (regp + CTX_MDHI) + gregoff);
  69   regcache_raw_supply (regcache, mips_regnum (gdbarch)->lo,
  70                        (const char *) (regp + CTX_MDLO) + gregoff);
  71   regcache_raw_supply (regcache, mips_regnum (gdbarch)->cause,
  72                        (const char *) (regp + CTX_CAUSE) + gregoff);
  73
  74   /* Fill inaccessible registers with zero.  */
  75   regcache_raw_supply (regcache, mips_regnum (gdbarch)->badvaddr, zerobuf);
  76 }
  77
  78 void
  79 fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
  80 {
  81   int regi, size;
  82   greg_t *regp = &(*gregsetp)[0];
  83   gdb_byte buf[MAX_REGISTER_SIZE];
  84   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  85
  86   /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
  87      executable, we have to sign extend the registers to 64 bits before
  88      filling in the gregset structure.  */
  89
  90   for (regi = 0; regi <= CTX_RA; regi++)
  91     if ((regno == -1) || (regno == regi))
  92       {
  93         size = register_size (gdbarch, regi);
  94         regcache_raw_collect (regcache, regi, buf);
  95         *(regp + regi) = extract_signed_integer (buf, size);
  96       }
  97
  98   if ((regno == -1) || (regno == gdbarch_pc_regnum (gdbarch)))
  99     {
 100       regi = mips_regnum (gdbarch)->pc;
 101       size = register_size (gdbarch, regi);
 102       regcache_raw_collect (regcache, regi, buf);
 103       *(regp + CTX_EPC) = extract_signed_integer (buf, size);
 104     }
 105
 106   if ((regno == -1) || (regno == mips_regnum (gdbarch)->cause))
 107     {
 108       regi = mips_regnum (gdbarch)->cause;
 109       size = register_size (gdbarch, regi);
 110       regcache_raw_collect (regcache, regi, buf);
 111       *(regp + CTX_CAUSE) = extract_signed_integer (buf, size);
 112     }
 113
 114   if ((regno == -1) || (regno == mips_regnum (gdbarch)->hi))
 115     {
 116       regi = mips_regnum (gdbarch)->hi;
 117       size = register_size (gdbarch, regi);
 118       regcache_raw_collect (regcache, regi, buf);
 119       *(regp + CTX_MDHI) = extract_signed_integer (buf, size);
 120     }
 121
 122   if ((regno == -1) || (regno == mips_regnum (gdbarch)->lo))
 123     {
 124       regi = mips_regnum (gdbarch)->lo;
 125       size = register_size (gdbarch, regi);
 126       regcache_raw_collect (regcache, regi, buf);
 127       *(regp + CTX_MDLO) = extract_signed_integer (buf, size);
 128     }
 129 }
 130
 131 /*
 132  * Now we do the same thing for floating-point registers.
 133  * We don't bother to condition on gdbarch_fp0_regnum since any
 134  * reasonable MIPS configuration has an R3010 in it.
 135  *
 136  * Again, see the comments in m68k-tdep.c.
 137  */
 138
 139 void
 140 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
 141 {
 142   int regi;
 143   static char zerobuf[32] = {0};
 144   char fsrbuf[8];
 145   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 146
 147   /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
 148
 149   for (regi = 0; regi < 32; regi++)
 150     regcache_raw_supply (regcache, gdbarch_fp0_regnum (gdbarch) + regi,
 151                          (const char *) &fpregsetp->fp_r.fp_regs[regi]);
 152
 153   /* We can't supply the FSR register directly to the regcache,
 154      because there is a size issue: On one hand, fpregsetp->fp_csr
 155      is 32bits long, while the regcache expects a 64bits long value.
 156      So we use a buffer of the correct size and copy into it the register
 157      value at the proper location.  */
 158   memset (fsrbuf, 0, 4);
 159   memcpy (fsrbuf + 4, &fpregsetp->fp_csr, 4);
 160
 161   regcache_raw_supply (regcache,
 162                        mips_regnum (gdbarch)->fp_control_status, fsrbuf);
 163
 164   /* FIXME: how can we supply FCRIR?  SGI doesn't tell us. */
 165   regcache_raw_supply (regcache,
 166                        mips_regnum (gdbarch)->fp_implementation_revision,
 167                        zerobuf);
 168 }
 169
 170 void
 171 fill_fpregset (const struct regcache *regcache, fpregset_t *fpregsetp, int regno)
 172 {
 173   int regi;
 174   char *from, *to;
 175   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 176
 177   /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
 178
 179   for (regi = gdbarch_fp0_regnum (gdbarch);
 180        regi < gdbarch_fp0_regnum (gdbarch) + 32; regi++)
 181     {
 182       if ((regno == -1) || (regno == regi))
 183         {
 184           to = (char *) &(fpregsetp->fp_r.fp_regs[regi - gdbarch_fp0_regnum
 185                                                          (gdbarch)]);
 186           regcache_raw_collect (regcache, regi, to);
 187         }
 188     }
 189
 190   if (regno == -1
 191       || regno == mips_regnum (gdbarch)->fp_control_status)
 192     {
 193       char fsrbuf[8];
 194
 195       /* We can't fill the FSR register directly from the regcache,
 196          because there is a size issue: On one hand, fpregsetp->fp_csr
 197          is 32bits long, while the regcache expects a 64bits long buffer.
 198          So we use a buffer of the correct size and copy the register
 199          value from that buffer.  */
 200       regcache_raw_collect (regcache,
 201                             mips_regnum (gdbarch)->fp_control_status, fsrbuf);
 202
 203       memcpy (&fpregsetp->fp_csr, fsrbuf + 4, 4);
 204     }
 205 }
 206
 207
 208 /* Provide registers to GDB from a core file.
 209
 210    CORE_REG_SECT points to an array of bytes, which were obtained from
 211    a core file which BFD thinks might contain register contents.
 212    CORE_REG_SIZE is its size.
 213
 214    Normally, WHICH says which register set corelow suspects this is:
 215      0 --- the general-purpose register set
 216      2 --- the floating-point register set
 217    However, for Irix 5, WHICH isn't used.
 218
 219    REG_ADDR is also unused.  */
 220
 221 static void
 222 fetch_core_registers (struct regcache *regcache,
 223                       char *core_reg_sect, unsigned core_reg_size,
 224                       int which, CORE_ADDR reg_addr)
 225 {
 226   char *srcp = core_reg_sect;
 227   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 228   int regsize = mips_isa_regsize (gdbarch);
 229   int regno;
 230
 231   /* If regsize is 8, this is a N32 or N64 core file.
 232      If regsize is 4, this is an O32 core file.  */
 233   if (core_reg_size != regsize * gdbarch_num_regs (gdbarch))
 234     {
 235       warning (_("wrong size gregset struct in core file"));
 236       return;
 237     }
 238
 239   for (regno = 0; regno < gdbarch_num_regs (gdbarch); regno++)
 240     {
 241       regcache_raw_supply (regcache, regno, srcp);
 242       srcp += regsize;
 243     }
 244 }
 245
 246 /* Register that we are able to handle irix5 core file formats.
 247    This really is bfd_target_unknown_flavour */
 248
 249 static struct core_fns irix5_core_fns =
 250 {
 251   bfd_target_unknown_flavour,           /* core_flavour */
 252   default_check_format,                 /* check_format */
 253   default_core_sniffer,                 /* core_sniffer */
 254   fetch_core_registers,                 /* core_read_registers */
 255   NULL                                  /* next */
 256 };
 257
 258 void
 259 _initialize_core_irix5 (void)
 260 {
 261   deprecated_add_core_fns (&irix5_core_fns);
 262 }