gdb/irix5-nat.c

   1 /* Native support for the SGI Iris running IRIX version 5, for GDB.
   2
   3    Copyright (C) 1988-1996, 1998-2002, 2004, 2006-2012 Free Software
   4    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 #include "procfs.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   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  87
  88   /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
  89      executable, we have to sign extend the registers to 64 bits before
  90      filling in the gregset structure.  */
  91
  92   for (regi = 0; regi <= CTX_RA; regi++)
  93     if ((regno == -1) || (regno == regi))
  94       {
  95         size = register_size (gdbarch, regi);
  96         regcache_raw_collect (regcache, regi, buf);
  97         *(regp + regi) = extract_signed_integer (buf, size, byte_order);
  98       }
  99
 100   if ((regno == -1) || (regno == mips_regnum (gdbarch)->pc))
 101     {
 102       regi = mips_regnum (gdbarch)->pc;
 103       size = register_size (gdbarch, regi);
 104       regcache_raw_collect (regcache, regi, buf);
 105       *(regp + CTX_EPC) = extract_signed_integer (buf, size, byte_order);
 106     }
 107
 108   if ((regno == -1) || (regno == mips_regnum (gdbarch)->cause))
 109     {
 110       regi = mips_regnum (gdbarch)->cause;
 111       size = register_size (gdbarch, regi);
 112       regcache_raw_collect (regcache, regi, buf);
 113       *(regp + CTX_CAUSE) = extract_signed_integer (buf, size, byte_order);
 114     }
 115
 116   if ((regno == -1) || (regno == mips_regnum (gdbarch)->hi))
 117     {
 118       regi = mips_regnum (gdbarch)->hi;
 119       size = register_size (gdbarch, regi);
 120       regcache_raw_collect (regcache, regi, buf);
 121       *(regp + CTX_MDHI) = extract_signed_integer (buf, size, byte_order);
 122     }
 123
 124   if ((regno == -1) || (regno == mips_regnum (gdbarch)->lo))
 125     {
 126       regi = mips_regnum (gdbarch)->lo;
 127       size = register_size (gdbarch, regi);
 128       regcache_raw_collect (regcache, regi, buf);
 129       *(regp + CTX_MDLO) = extract_signed_integer (buf, size, byte_order);
 130     }
 131 }
 132
 133 /*
 134  * Now we do the same thing for floating-point registers.
 135  * We don't bother to condition on gdbarch_fp0_regnum since any
 136  * reasonable MIPS configuration has an R3010 in it.
 137  *
 138  * Again, see the comments in m68k-tdep.c.
 139  */
 140
 141 void
 142 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
 143 {
 144   int regi;
 145   static char zerobuf[32] = {0};
 146   char fsrbuf[8];
 147   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 148
 149   /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs.  */
 150
 151   for (regi = 0; regi < 32; regi++)
 152     regcache_raw_supply (regcache, gdbarch_fp0_regnum (gdbarch) + regi,
 153                          (const char *) &fpregsetp->__fp_r.__fp_regs[regi]);
 154
 155   /* We can't supply the FSR register directly to the regcache,
 156      because there is a size issue: On one hand, fpregsetp->fp_csr
 157      is 32bits long, while the regcache expects a 64bits long value.
 158      So we use a buffer of the correct size and copy into it the register
 159      value at the proper location.  */
 160   memset (fsrbuf, 0, 4);
 161   memcpy (fsrbuf + 4, &fpregsetp->__fp_csr, 4);
 162
 163   regcache_raw_supply (regcache,
 164                        mips_regnum (gdbarch)->fp_control_status, fsrbuf);
 165
 166   /* FIXME: how can we supply FCRIR?  SGI doesn't tell us.  */
 167   regcache_raw_supply (regcache,
 168                        mips_regnum (gdbarch)->fp_implementation_revision,
 169                        zerobuf);
 170 }
 171
 172 void
 173 fill_fpregset (const struct regcache *regcache,
 174                fpregset_t *fpregsetp, int regno)
 175 {
 176   int regi;
 177   char *from, *to;
 178   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 179
 180   /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs.  */
 181
 182   for (regi = gdbarch_fp0_regnum (gdbarch);
 183        regi < gdbarch_fp0_regnum (gdbarch) + 32; regi++)
 184     {
 185       if ((regno == -1) || (regno == regi))
 186         {
 187           const int fp0_regnum = gdbarch_fp0_regnum (gdbarch);
 188
 189           to = (char *) &(fpregsetp->__fp_r.__fp_regs[regi - fp0_regnum]);
 190           regcache_raw_collect (regcache, regi, to);
 191         }
 192     }
 193
 194   if (regno == -1
 195       || regno == mips_regnum (gdbarch)->fp_control_status)
 196     {
 197       char fsrbuf[8];
 198
 199       /* We can't fill the FSR register directly from the regcache,
 200          because there is a size issue: On one hand, fpregsetp->fp_csr
 201          is 32bits long, while the regcache expects a 64bits long buffer.
 202          So we use a buffer of the correct size and copy the register
 203          value from that buffer.  */
 204       regcache_raw_collect (regcache,
 205                             mips_regnum (gdbarch)->fp_control_status, fsrbuf);
 206
 207       memcpy (&fpregsetp->__fp_csr, fsrbuf + 4, 4);
 208     }
 209 }
 210
 211
 212 /* Provide registers to GDB from a core file.
 213
 214    CORE_REG_SECT points to an array of bytes, which were obtained from
 215    a core file which BFD thinks might contain register contents.
 216    CORE_REG_SIZE is its size.
 217
 218    Normally, WHICH says which register set corelow suspects this is:
 219      0 --- the general-purpose register set
 220      2 --- the floating-point register set
 221    However, for Irix 5, WHICH isn't used.
 222
 223    REG_ADDR is also unused.  */
 224
 225 static void
 226 fetch_core_registers (struct regcache *regcache,
 227                       char *core_reg_sect, unsigned core_reg_size,
 228                       int which, CORE_ADDR reg_addr)
 229 {
 230   char *srcp = core_reg_sect;
 231   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 232   int regsize = mips_isa_regsize (gdbarch);
 233   int regno;
 234
 235   /* If regsize is 8, this is a N32 or N64 core file.
 236      If regsize is 4, this is an O32 core file.  */
 237   if (core_reg_size != regsize * gdbarch_num_regs (gdbarch))
 238     {
 239       warning (_("wrong size gregset struct in core file"));
 240       return;
 241     }
 242
 243   for (regno = 0; regno < gdbarch_num_regs (gdbarch); regno++)
 244     {
 245       regcache_raw_supply (regcache, regno, srcp);
 246       srcp += regsize;
 247     }
 248 }
 249
 250 /* Register that we are able to handle irix5 core file formats.
 251    This really is bfd_target_unknown_flavour.  */
 252
 253 static struct core_fns irix5_core_fns =
 254 {
 255   bfd_target_unknown_flavour,           /* core_flavour */
 256   default_check_format,                 /* check_format */
 257   default_core_sniffer,                 /* core_sniffer */
 258   fetch_core_registers,                 /* core_read_registers */
 259   NULL                                  /* next */
 260 };
 261
 262 /* Provide a prototype to silence -Wmissing-prototypes.  */
 263 extern initialize_file_ftype _initialize_irix5_nat;
 264
 265 void
 266 _initialize_irix5_nat (void)
 267 {
 268   struct target_ops *t;
 269
 270   t = procfs_target ();
 271   procfs_use_watchpoints (t);
 272   add_target (t);
 273
 274   deprecated_add_core_fns (&irix5_core_fns);
 275 }