gdb/irix5-nat.c

   1 /* Native support for the SGI Iris running IRIX version 5, for GDB.
   2
   3    Copyright (C) 1988-2014 Free Software Foundation, Inc.
   4
   5    Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
   6    and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
   7    Implemented for Irix 4.x by Garrett A. Wollman.
   8    Modified for Irix 5.x by Ian Lance Taylor.
   9
  10    This file is part of GDB.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  24
  25 #include "defs.h"
  26 #include "inferior.h"
  27 #include "gdbcore.h"
  28 #include "target.h"
  29 #include "regcache.h"
  30 #include "procfs.h"
  31 #include <sys/time.h>
  32 #include <sys/procfs.h>
  33 #include <setjmp.h>             /* For JB_XXX.  */
  34
  35 /* Prototypes for supply_gregset etc.  */
  36 #include "gregset.h"
  37 #include "mips-tdep.h"
  38
  39 static void fetch_core_registers (struct regcache *, char *,
  40                                   unsigned int, int, CORE_ADDR);
  41
  42
  43 /*
  44  * See the comment in m68k-tdep.c regarding the utility of these functions.
  45  *
  46  * These definitions are from the MIPS SVR4 ABI, so they may work for
  47  * any MIPS SVR4 target.
  48  */
  49
  50 void
  51 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
  52 {
  53   int regi;
  54   const greg_t *regp = &(*gregsetp)[0];
  55   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  56   int gregoff = sizeof (greg_t) - mips_isa_regsize (gdbarch);
  57   static char zerobuf[32] = {0};
  58
  59   for (regi = 0; regi <= CTX_RA; regi++)
  60     regcache_raw_supply (regcache, regi,
  61                          (const char *) (regp + regi) + gregoff);
  62
  63   regcache_raw_supply (regcache, mips_regnum (gdbarch)->pc,
  64                        (const char *) (regp + CTX_EPC) + gregoff);
  65   regcache_raw_supply (regcache, mips_regnum (gdbarch)->hi,
  66                        (const char *) (regp + CTX_MDHI) + gregoff);
  67   regcache_raw_supply (regcache, mips_regnum (gdbarch)->lo,
  68                        (const char *) (regp + CTX_MDLO) + gregoff);
  69   regcache_raw_supply (regcache, mips_regnum (gdbarch)->cause,
  70                        (const char *) (regp + CTX_CAUSE) + gregoff);
  71
  72   /* Fill inaccessible registers with zero.  */
  73   regcache_raw_supply (regcache, mips_regnum (gdbarch)->badvaddr, zerobuf);
  74 }
  75
  76 void
  77 fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
  78 {
  79   int regi, size;
  80   greg_t *regp = &(*gregsetp)[0];
  81   gdb_byte buf[MAX_REGISTER_SIZE];
  82   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  83   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  84
  85   /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
  86      executable, we have to sign extend the registers to 64 bits before
  87      filling in the gregset structure.  */
  88
  89   for (regi = 0; regi <= CTX_RA; regi++)
  90     if ((regno == -1) || (regno == regi))
  91       {
  92         size = register_size (gdbarch, regi);
  93         regcache_raw_collect (regcache, regi, buf);
  94         *(regp + regi) = extract_signed_integer (buf, size, byte_order);
  95       }
  96
  97   if ((regno == -1) || (regno == mips_regnum (gdbarch)->pc))
  98     {
  99       regi = mips_regnum (gdbarch)->pc;
 100       size = register_size (gdbarch, regi);
 101       regcache_raw_collect (regcache, regi, buf);
 102       *(regp + CTX_EPC) = extract_signed_integer (buf, size, byte_order);
 103     }
 104
 105   if ((regno == -1) || (regno == mips_regnum (gdbarch)->cause))
 106     {
 107       regi = mips_regnum (gdbarch)->cause;
 108       size = register_size (gdbarch, regi);
 109       regcache_raw_collect (regcache, regi, buf);
 110       *(regp + CTX_CAUSE) = extract_signed_integer (buf, size, byte_order);
 111     }
 112
 113   if ((regno == -1) || (regno == mips_regnum (gdbarch)->hi))
 114     {
 115       regi = mips_regnum (gdbarch)->hi;
 116       size = register_size (gdbarch, regi);
 117       regcache_raw_collect (regcache, regi, buf);
 118       *(regp + CTX_MDHI) = extract_signed_integer (buf, size, byte_order);
 119     }
 120
 121   if ((regno == -1) || (regno == mips_regnum (gdbarch)->lo))
 122     {
 123       regi = mips_regnum (gdbarch)->lo;
 124       size = register_size (gdbarch, regi);
 125       regcache_raw_collect (regcache, regi, buf);
 126       *(regp + CTX_MDLO) = extract_signed_integer (buf, size, byte_order);
 127     }
 128 }
 129
 130 /*
 131  * Now we do the same thing for floating-point registers.
 132  * We don't bother to condition on gdbarch_fp0_regnum since any
 133  * reasonable MIPS configuration has an R3010 in it.
 134  *
 135  * Again, see the comments in m68k-tdep.c.
 136  */
 137
 138 void
 139 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
 140 {
 141   int regi;
 142   static char zerobuf[32] = {0};
 143   char fsrbuf[8];
 144   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 145
 146   /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs.  */
 147
 148   for (regi = 0; regi < 32; regi++)
 149     regcache_raw_supply (regcache, gdbarch_fp0_regnum (gdbarch) + regi,
 150                          (const char *) &fpregsetp->__fp_r.__fp_regs[regi]);
 151
 152   /* We can't supply the FSR register directly to the regcache,
 153      because there is a size issue: On one hand, fpregsetp->fp_csr
 154      is 32bits long, while the regcache expects a 64bits long value.
 155      So we use a buffer of the correct size and copy into it the register
 156      value at the proper location.  */
 157   memset (fsrbuf, 0, 4);
 158   memcpy (fsrbuf + 4, &fpregsetp->__fp_csr, 4);
 159
 160   regcache_raw_supply (regcache,
 161                        mips_regnum (gdbarch)->fp_control_status, fsrbuf);
 162
 163   /* FIXME: how can we supply FCRIR?  SGI doesn't tell us.  */
 164   regcache_raw_supply (regcache,
 165                        mips_regnum (gdbarch)->fp_implementation_revision,
 166                        zerobuf);
 167 }
 168
 169 void
 170 fill_fpregset (const struct regcache *regcache,
 171                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           const int fp0_regnum = gdbarch_fp0_regnum (gdbarch);
 185
 186           to = (char *) &(fpregsetp->__fp_r.__fp_regs[regi - fp0_regnum]);
 187           regcache_raw_collect (regcache, regi, to);
 188         }
 189     }
 190
 191   if (regno == -1
 192       || regno == mips_regnum (gdbarch)->fp_control_status)
 193     {
 194       char fsrbuf[8];
 195
 196       /* We can't fill the FSR register directly from the regcache,
 197          because there is a size issue: On one hand, fpregsetp->fp_csr
 198          is 32bits long, while the regcache expects a 64bits long buffer.
 199          So we use a buffer of the correct size and copy the register
 200          value from that buffer.  */
 201       regcache_raw_collect (regcache,
 202                             mips_regnum (gdbarch)->fp_control_status, fsrbuf);
 203
 204       memcpy (&fpregsetp->__fp_csr, fsrbuf + 4, 4);
 205     }
 206 }
 207
 208
 209 /* Provide registers to GDB from a core file.
 210
 211    CORE_REG_SECT points to an array of bytes, which were obtained from
 212    a core file which BFD thinks might contain register contents.
 213    CORE_REG_SIZE is its size.
 214
 215    Normally, WHICH says which register set corelow suspects this is:
 216      0 --- the general-purpose register set
 217      2 --- the floating-point register set
 218    However, for Irix 5, WHICH isn't used.
 219
 220    REG_ADDR is also unused.  */
 221
 222 static void
 223 fetch_core_registers (struct regcache *regcache,
 224                       char *core_reg_sect, unsigned core_reg_size,
 225                       int which, CORE_ADDR reg_addr)
 226 {
 227   char *srcp = core_reg_sect;
 228   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 229   int regsize = mips_isa_regsize (gdbarch);
 230   int regno;
 231
 232   /* If regsize is 8, this is a N32 or N64 core file.
 233      If regsize is 4, this is an O32 core file.  */
 234   if (core_reg_size != regsize * gdbarch_num_regs (gdbarch))
 235     {
 236       warning (_("wrong size gregset struct in core file"));
 237       return;
 238     }
 239
 240   for (regno = 0; regno < gdbarch_num_regs (gdbarch); regno++)
 241     {
 242       regcache_raw_supply (regcache, regno, srcp);
 243       srcp += regsize;
 244     }
 245 }
 246
 247 /* Register that we are able to handle irix5 core file formats.
 248    This really is bfd_target_unknown_flavour.  */
 249
 250 static struct core_fns irix5_core_fns =
 251 {
 252   bfd_target_unknown_flavour,           /* core_flavour */
 253   default_check_format,                 /* check_format */
 254   default_core_sniffer,                 /* core_sniffer */
 255   fetch_core_registers,                 /* core_read_registers */
 256   NULL                                  /* next */
 257 };
 258
 259 /* Provide a prototype to silence -Wmissing-prototypes.  */
 260 extern initialize_file_ftype _initialize_irix5_nat;
 261
 262 void
 263 _initialize_irix5_nat (void)
 264 {
 265   struct target_ops *t;
 266
 267   t = procfs_target ();
 268   procfs_use_watchpoints (t);
 269   add_target (t);
 270
 271   deprecated_add_core_fns (&irix5_core_fns);
 272 }