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, 2008
   5    Free Software Foundation, Inc.
   6
   7    Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
   8    and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
   9    Implemented for Irix 4.x by Garrett A. Wollman.
  10    Modified for Irix 5.x by Ian Lance Taylor.
  11
  12    This file is part of GDB.
  13
  14    This program is free software; you can redistribute it and/or modify
  15    it under the terms of the GNU General Public License as published by
  16    the Free Software Foundation; either version 3 of the License, or
  17    (at your option) any later version.
  18
  19    This program is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22    GNU General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  26
  27 #include "defs.h"
  28 #include "inferior.h"
  29 #include "gdbcore.h"
  30 #include "target.h"
  31 #include "regcache.h"
  32
  33 #include "gdb_string.h"
  34 #include <sys/time.h>
  35 #include <sys/procfs.h>
  36 #include <setjmp.h>             /* For JB_XXX.  */
  37
  38 /* Prototypes for supply_gregset etc. */
  39 #include "gregset.h"
  40 #include "mips-tdep.h"
  41
  42 static void fetch_core_registers (struct regcache *, char *,
  43                                   unsigned int, int, CORE_ADDR);
  44
  45
  46 /*
  47  * See the comment in m68k-tdep.c regarding the utility of these functions.
  48  *
  49  * These definitions are from the MIPS SVR4 ABI, so they may work for
  50  * any MIPS SVR4 target.
  51  */
  52
  53 void
  54 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
  55 {
  56   int regi;
  57   const greg_t *regp = &(*gregsetp)[0];
  58   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  59   int gregoff = sizeof (greg_t) - mips_isa_regsize (gdbarch);
  60   static char zerobuf[32] = {0};
  61
  62   for (regi = 0; regi <= CTX_RA; regi++)
  63     regcache_raw_supply (regcache, regi,
  64                          (const char *) (regp + regi) + gregoff);
  65
  66   regcache_raw_supply (regcache, mips_regnum (gdbarch)->pc,
  67                        (const char *) (regp + CTX_EPC) + gregoff);
  68   regcache_raw_supply (regcache, mips_regnum (gdbarch)->hi,
  69                        (const char *) (regp + CTX_MDHI) + gregoff);
  70   regcache_raw_supply (regcache, mips_regnum (gdbarch)->lo,
  71                        (const char *) (regp + CTX_MDLO) + gregoff);
  72   regcache_raw_supply (regcache, mips_regnum (gdbarch)->cause,
  73                        (const char *) (regp + CTX_CAUSE) + gregoff);
  74
  75   /* Fill inaccessible registers with zero.  */
  76   regcache_raw_supply (regcache, mips_regnum (gdbarch)->badvaddr, zerobuf);
  77 }
  78
  79 void
  80 fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
  81 {
  82   int regi, size;
  83   greg_t *regp = &(*gregsetp)[0];
  84   gdb_byte buf[MAX_REGISTER_SIZE];
  85   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  86
  87   /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
  88      executable, we have to sign extend the registers to 64 bits before
  89      filling in the gregset structure.  */
  90
  91   for (regi = 0; regi <= CTX_RA; regi++)
  92     if ((regno == -1) || (regno == regi))
  93       {
  94         size = register_size (gdbarch, regi);
  95         regcache_raw_collect (regcache, regi, buf);
  96         *(regp + regi) = extract_signed_integer (buf, size);
  97       }
  98
  99   if ((regno == -1) || (regno == gdbarch_pc_regnum (gdbarch)))
 100     {
 101       regi = mips_regnum (gdbarch)->pc;
 102       size = register_size (gdbarch, regi);
 103       regcache_raw_collect (regcache, regi, buf);
 104       *(regp + CTX_EPC) = extract_signed_integer (buf, size);
 105     }
 106
 107   if ((regno == -1) || (regno == mips_regnum (gdbarch)->cause))
 108     {
 109       regi = mips_regnum (gdbarch)->cause;
 110       size = register_size (gdbarch, regi);
 111       regcache_raw_collect (regcache, regi, buf);
 112       *(regp + CTX_CAUSE) = extract_signed_integer (buf, size);
 113     }
 114
 115   if ((regno == -1) || (regno == mips_regnum (gdbarch)->hi))
 116     {
 117       regi = mips_regnum (gdbarch)->hi;
 118       size = register_size (gdbarch, regi);
 119       regcache_raw_collect (regcache, regi, buf);
 120       *(regp + CTX_MDHI) = extract_signed_integer (buf, size);
 121     }
 122
 123   if ((regno == -1) || (regno == mips_regnum (gdbarch)->lo))
 124     {
 125       regi = mips_regnum (gdbarch)->lo;
 126       size = register_size (gdbarch, regi);
 127       regcache_raw_collect (regcache, regi, buf);
 128       *(regp + CTX_MDLO) = extract_signed_integer (buf, size);
 129     }
 130 }
 131
 132 /*
 133  * Now we do the same thing for floating-point registers.
 134  * We don't bother to condition on gdbarch_fp0_regnum since any
 135  * reasonable MIPS configuration has an R3010 in it.
 136  *
 137  * Again, see the comments in m68k-tdep.c.
 138  */
 139
 140 void
 141 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
 142 {
 143   int regi;
 144   static char zerobuf[32] = {0};
 145   char fsrbuf[8];
 146   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 147
 148   /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
 149
 150   for (regi = 0; regi < 32; regi++)
 151     regcache_raw_supply (regcache, gdbarch_fp0_regnum (gdbarch) + regi,
 152                          (const char *) &fpregsetp->fp_r.fp_regs[regi]);
 153
 154   /* We can't supply the FSR register directly to the regcache,
 155      because there is a size issue: On one hand, fpregsetp->fp_csr
 156      is 32bits long, while the regcache expects a 64bits long value.
 157      So we use a buffer of the correct size and copy into it the register
 158      value at the proper location.  */
 159   memset (fsrbuf, 0, 4);
 160   memcpy (fsrbuf + 4, &fpregsetp->fp_csr, 4);
 161
 162   regcache_raw_supply (regcache,
 163                        mips_regnum (gdbarch)->fp_control_status, fsrbuf);
 164
 165   /* FIXME: how can we supply FCRIR?  SGI doesn't tell us. */
 166   regcache_raw_supply (regcache,
 167                        mips_regnum (gdbarch)->fp_implementation_revision,
 168                        zerobuf);
 169 }
 170
 171 void
 172 fill_fpregset (const struct regcache *regcache, fpregset_t *fpregsetp, int regno)
 173 {
 174   int regi;
 175   char *from, *to;
 176   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 177
 178   /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
 179
 180   for (regi = gdbarch_fp0_regnum (gdbarch);
 181        regi < gdbarch_fp0_regnum (gdbarch) + 32; regi++)
 182     {
 183       if ((regno == -1) || (regno == regi))
 184         {
 185           to = (char *) &(fpregsetp->fp_r.fp_regs[regi - gdbarch_fp0_regnum
 186                                                          (gdbarch)]);
 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 void
 260 _initialize_core_irix5 (void)
 261 {
 262   deprecated_add_core_fns (&irix5_core_fns);
 263 }