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, 2010, 2011
   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 == mips_regnum (gdbarch)->pc))
 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,
 175                fpregset_t *fpregsetp, int regno)
 176 {
 177   int regi;
 178   char *from, *to;
 179   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 180
 181   /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs.  */
 182
 183   for (regi = gdbarch_fp0_regnum (gdbarch);
 184        regi < gdbarch_fp0_regnum (gdbarch) + 32; regi++)
 185     {
 186       if ((regno == -1) || (regno == regi))
 187         {
 188           const int fp0_regnum = gdbarch_fp0_regnum (gdbarch);
 189
 190           to = (char *) &(fpregsetp->__fp_r.__fp_regs[regi - fp0_regnum]);
 191           regcache_raw_collect (regcache, regi, to);
 192         }
 193     }
 194
 195   if (regno == -1
 196       || regno == mips_regnum (gdbarch)->fp_control_status)
 197     {
 198       char fsrbuf[8];
 199
 200       /* We can't fill the FSR register directly from the regcache,
 201          because there is a size issue: On one hand, fpregsetp->fp_csr
 202          is 32bits long, while the regcache expects a 64bits long buffer.
 203          So we use a buffer of the correct size and copy the register
 204          value from that buffer.  */
 205       regcache_raw_collect (regcache,
 206                             mips_regnum (gdbarch)->fp_control_status, fsrbuf);
 207
 208       memcpy (&fpregsetp->__fp_csr, fsrbuf + 4, 4);
 209     }
 210 }
 211
 212
 213 /* Provide registers to GDB from a core file.
 214
 215    CORE_REG_SECT points to an array of bytes, which were obtained from
 216    a core file which BFD thinks might contain register contents.
 217    CORE_REG_SIZE is its size.
 218
 219    Normally, WHICH says which register set corelow suspects this is:
 220      0 --- the general-purpose register set
 221      2 --- the floating-point register set
 222    However, for Irix 5, WHICH isn't used.
 223
 224    REG_ADDR is also unused.  */
 225
 226 static void
 227 fetch_core_registers (struct regcache *regcache,
 228                       char *core_reg_sect, unsigned core_reg_size,
 229                       int which, CORE_ADDR reg_addr)
 230 {
 231   char *srcp = core_reg_sect;
 232   struct gdbarch *gdbarch = get_regcache_arch (regcache);
 233   int regsize = mips_isa_regsize (gdbarch);
 234   int regno;
 235
 236   /* If regsize is 8, this is a N32 or N64 core file.
 237      If regsize is 4, this is an O32 core file.  */
 238   if (core_reg_size != regsize * gdbarch_num_regs (gdbarch))
 239     {
 240       warning (_("wrong size gregset struct in core file"));
 241       return;
 242     }
 243
 244   for (regno = 0; regno < gdbarch_num_regs (gdbarch); regno++)
 245     {
 246       regcache_raw_supply (regcache, regno, srcp);
 247       srcp += regsize;
 248     }
 249 }
 250
 251 /* Register that we are able to handle irix5 core file formats.
 252    This really is bfd_target_unknown_flavour.  */
 253
 254 static struct core_fns irix5_core_fns =
 255 {
 256   bfd_target_unknown_flavour,           /* core_flavour */
 257   default_check_format,                 /* check_format */
 258   default_core_sniffer,                 /* core_sniffer */
 259   fetch_core_registers,                 /* core_read_registers */
 260   NULL                                  /* next */
 261 };
 262
 263 /* Provide a prototype to silence -Wmissing-prototypes.  */
 264 extern initialize_file_ftype _initialize_irix5_nat;
 265
 266 void
 267 _initialize_irix5_nat (void)
 268 {
 269   struct target_ops *t;
 270
 271   t = procfs_target ();
 272   procfs_use_watchpoints (t);
 273   add_target (t);
 274
 275   deprecated_add_core_fns (&irix5_core_fns);
 276 }