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, 2009
   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 #include "procfs.h"
  33
  34 #include "gdb_string.h"
  35 #include <sys/time.h>
  36 #include <sys/procfs.h>
  37 #include <setjmp.h>             /* For JB_XXX.  */
  38
  39 /* Prototypes for supply_gregset etc. */
  40 #include "gregset.h"
  41 #include "mips-tdep.h"
  42
  43 static void fetch_core_registers (struct regcache *, char *,
  44                                   unsigned int, int, CORE_ADDR);
  45
  46
  47 /*
  48  * See the comment in m68k-tdep.c regarding the utility of these functions.
  49  *
  50  * These definitions are from the MIPS SVR4 ABI, so they may work for
  51  * any MIPS SVR4 target.
  52  */
  53
  54 void
  55 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
  56 {
  57   int regi;
  58   const greg_t *regp = &(*gregsetp)[0];
  59   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  60   int gregoff = sizeof (greg_t) - mips_isa_regsize (gdbarch);
  61   static char zerobuf[32] = {0};
  62
  63   for (regi = 0; regi <= CTX_RA; regi++)
  64     regcache_raw_supply (regcache, regi,
  65                          (const char *) (regp + regi) + gregoff);
  66
  67   regcache_raw_supply (regcache, mips_regnum (gdbarch)->pc,
  68                        (const char *) (regp + CTX_EPC) + gregoff);
  69   regcache_raw_supply (regcache, mips_regnum (gdbarch)->hi,
  70                        (const char *) (regp + CTX_MDHI) + gregoff);
  71   regcache_raw_supply (regcache, mips_regnum (gdbarch)->lo,
  72                        (const char *) (regp + CTX_MDLO) + gregoff);
  73   regcache_raw_supply (regcache, mips_regnum (gdbarch)->cause,
  74                        (const char *) (regp + CTX_CAUSE) + gregoff);
  75
  76   /* Fill inaccessible registers with zero.  */
  77   regcache_raw_supply (regcache, mips_regnum (gdbarch)->badvaddr, zerobuf);
  78 }
  79
  80 void
  81 fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
  82 {
  83   int regi, size;
  84   greg_t *regp = &(*gregsetp)[0];
  85   gdb_byte buf[MAX_REGISTER_SIZE];
  86   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  87   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  88
  89   /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
  90      executable, we have to sign extend the registers to 64 bits before
  91      filling in the gregset structure.  */
  92
  93   for (regi = 0; regi <= CTX_RA; regi++)
  94     if ((regno == -1) || (regno == regi))
  95       {
  96         size = register_size (gdbarch, regi);
  97         regcache_raw_collect (regcache, regi, buf);
  98         *(regp + regi) = extract_signed_integer (buf, size, byte_order);
  99       }
 100
 101   if ((regno == -1) || (regno == gdbarch_pc_regnum (gdbarch)))
 102     {
 103       regi = mips_regnum (gdbarch)->pc;
 104       size = register_size (gdbarch, regi);
 105       regcache_raw_collect (regcache, regi, buf);
 106       *(regp + CTX_EPC) = extract_signed_integer (buf, size, byte_order);
 107     }
 108
 109   if ((regno == -1) || (regno == mips_regnum (gdbarch)->cause))
 110     {
 111       regi = mips_regnum (gdbarch)->cause;
 112       size = register_size (gdbarch, regi);
 113       regcache_raw_collect (regcache, regi, buf);
 114       *(regp + CTX_CAUSE) = extract_signed_integer (buf, size, byte_order);
 115     }
 116
 117   if ((regno == -1) || (regno == mips_regnum (gdbarch)->hi))
 118     {
 119       regi = mips_regnum (gdbarch)->hi;
 120       size = register_size (gdbarch, regi);
 121       regcache_raw_collect (regcache, regi, buf);
 122       *(regp + CTX_MDHI) = extract_signed_integer (buf, size, byte_order);
 123     }
 124
 125   if ((regno == -1) || (regno == mips_regnum (gdbarch)->lo))
 126     {
 127       regi = mips_regnum (gdbarch)->lo;
 128       size = register_size (gdbarch, regi);
 129       regcache_raw_collect (regcache, regi, buf);
 130       *(regp + CTX_MDLO) = extract_signed_integer (buf, size, byte_order);
 131     }
 132 }
 133
 134 /*
 135  * Now we do the same thing for floating-point registers.
 136  * We don't bother to condition on gdbarch_fp0_regnum since any
 137  * reasonable MIPS configuration has an R3010 in it.
 138  *
 139  * Again, see the comments in m68k-tdep.c.
 140  */
 141
 142 void
 143 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
 144 {
 145   int regi;
 146   static char zerobuf[32] = {0};
 147   char fsrbuf[8];
 148   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 149
 150   /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
 151
 152   for (regi = 0; regi < 32; regi++)
 153     regcache_raw_supply (regcache, gdbarch_fp0_regnum (gdbarch) + regi,
 154                          (const char *) &fpregsetp->fp_r.fp_regs[regi]);
 155
 156   /* We can't supply the FSR register directly to the regcache,
 157      because there is a size issue: On one hand, fpregsetp->fp_csr
 158      is 32bits long, while the regcache expects a 64bits long value.
 159      So we use a buffer of the correct size and copy into it the register
 160      value at the proper location.  */
 161   memset (fsrbuf, 0, 4);
 162   memcpy (fsrbuf + 4, &fpregsetp->fp_csr, 4);
 163
 164   regcache_raw_supply (regcache,
 165                        mips_regnum (gdbarch)->fp_control_status, fsrbuf);
 166
 167   /* FIXME: how can we supply FCRIR?  SGI doesn't tell us. */
 168   regcache_raw_supply (regcache,
 169                        mips_regnum (gdbarch)->fp_implementation_revision,
 170                        zerobuf);
 171 }
 172
 173 void
 174 fill_fpregset (const struct regcache *regcache, 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           to = (char *) &(fpregsetp->fp_r.fp_regs[regi - gdbarch_fp0_regnum
 188                                                          (gdbarch)]);
 189           regcache_raw_collect (regcache, regi, to);
 190         }
 191     }
 192
 193   if (regno == -1
 194       || regno == mips_regnum (gdbarch)->fp_control_status)
 195     {
 196       char fsrbuf[8];
 197
 198       /* We can't fill the FSR register directly from the regcache,
 199          because there is a size issue: On one hand, fpregsetp->fp_csr
 200          is 32bits long, while the regcache expects a 64bits long buffer.
 201          So we use a buffer of the correct size and copy the register
 202          value from that buffer.  */
 203       regcache_raw_collect (regcache,
 204                             mips_regnum (gdbarch)->fp_control_status, fsrbuf);
 205
 206       memcpy (&fpregsetp->fp_csr, fsrbuf + 4, 4);
 207     }
 208 }
 209
 210
 211 /* Provide registers to GDB from a core file.
 212
 213    CORE_REG_SECT points to an array of bytes, which were obtained from
 214    a core file which BFD thinks might contain register contents.
 215    CORE_REG_SIZE is its size.
 216
 217    Normally, WHICH says which register set corelow suspects this is:
 218      0 --- the general-purpose register set
 219      2 --- the floating-point register set
 220    However, for Irix 5, WHICH isn't used.
 221
 222    REG_ADDR is also unused.  */
 223
 224 static void
 225 fetch_core_registers (struct regcache *regcache,
 226                       char *core_reg_sect, unsigned core_reg_size,
 227                       int which, CORE_ADDR reg_addr)
 228 {
 229   char *srcp = core_reg_sect;
 230   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 231   int regsize = mips_isa_regsize (gdbarch);
 232   int regno;
 233
 234   /* If regsize is 8, this is a N32 or N64 core file.
 235      If regsize is 4, this is an O32 core file.  */
 236   if (core_reg_size != regsize * gdbarch_num_regs (gdbarch))
 237     {
 238       warning (_("wrong size gregset struct in core file"));
 239       return;
 240     }
 241
 242   for (regno = 0; regno < gdbarch_num_regs (gdbarch); regno++)
 243     {
 244       regcache_raw_supply (regcache, regno, srcp);
 245       srcp += regsize;
 246     }
 247 }
 248
 249 /* Register that we are able to handle irix5 core file formats.
 250    This really is bfd_target_unknown_flavour */
 251
 252 static struct core_fns irix5_core_fns =
 253 {
 254   bfd_target_unknown_flavour,           /* core_flavour */
 255   default_check_format,                 /* check_format */
 256   default_core_sniffer,                 /* core_sniffer */
 257   fetch_core_registers,                 /* core_read_registers */
 258   NULL                                  /* next */
 259 };
 260
 261 /* Provide a prototype to silence -Wmissing-prototypes.  */
 262 extern initialize_file_ftype _initialize_irix5_nat;
 263
 264 void
 265 _initialize_irix5_nat (void)
 266 {
 267   struct target_ops *t;
 268
 269   t = procfs_target ();
 270   procfs_use_watchpoints (t);
 271   add_target (t);
 272
 273   deprecated_add_core_fns (&irix5_core_fns);
 274 }