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[/] [openrisc/] [trunk/] [gnu-stable/] [gdb-7.2/] [gdb/] [irix5-nat.c] - Blame information for rev 841

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1 330 jeremybenn
/* Native support for the SGI Iris running IRIX version 5, for GDB.
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3
   Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
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   1999, 2000, 2001, 2002, 2004, 2006, 2007, 2008, 2009, 2010
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   Free Software Foundation, Inc.
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7
   Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
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   and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
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   Implemented for Irix 4.x by Garrett A. Wollman.
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   Modified for Irix 5.x by Ian Lance Taylor.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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19
   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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24
   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#include "defs.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "target.h"
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#include "regcache.h"
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#include "procfs.h"
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#include "gdb_string.h"
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#include <sys/time.h>
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#include <sys/procfs.h>
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#include <setjmp.h>             /* For JB_XXX.  */
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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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#include "mips-tdep.h"
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static void fetch_core_registers (struct regcache *, char *,
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                                  unsigned int, int, CORE_ADDR);
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46
 
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/*
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 * See the comment in m68k-tdep.c regarding the utility of these functions.
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 *
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 * These definitions are from the MIPS SVR4 ABI, so they may work for
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 * any MIPS SVR4 target.
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 */
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void
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supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
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{
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  int regi;
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  const greg_t *regp = &(*gregsetp)[0];
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  struct gdbarch *gdbarch = get_regcache_arch (regcache);
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  int gregoff = sizeof (greg_t) - mips_isa_regsize (gdbarch);
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  static char zerobuf[32] = {0};
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  for (regi = 0; regi <= CTX_RA; regi++)
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    regcache_raw_supply (regcache, regi,
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                         (const char *) (regp + regi) + gregoff);
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  regcache_raw_supply (regcache, mips_regnum (gdbarch)->pc,
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                       (const char *) (regp + CTX_EPC) + gregoff);
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  regcache_raw_supply (regcache, mips_regnum (gdbarch)->hi,
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                       (const char *) (regp + CTX_MDHI) + gregoff);
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  regcache_raw_supply (regcache, mips_regnum (gdbarch)->lo,
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                       (const char *) (regp + CTX_MDLO) + gregoff);
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  regcache_raw_supply (regcache, mips_regnum (gdbarch)->cause,
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                       (const char *) (regp + CTX_CAUSE) + gregoff);
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  /* Fill inaccessible registers with zero.  */
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  regcache_raw_supply (regcache, mips_regnum (gdbarch)->badvaddr, zerobuf);
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}
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80
void
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fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
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{
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  int regi, size;
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  greg_t *regp = &(*gregsetp)[0];
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  gdb_byte buf[MAX_REGISTER_SIZE];
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  struct gdbarch *gdbarch = get_regcache_arch (regcache);
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  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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  /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
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     executable, we have to sign extend the registers to 64 bits before
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     filling in the gregset structure.  */
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  for (regi = 0; regi <= CTX_RA; regi++)
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    if ((regno == -1) || (regno == regi))
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      {
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        size = register_size (gdbarch, regi);
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        regcache_raw_collect (regcache, regi, buf);
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        *(regp + regi) = extract_signed_integer (buf, size, byte_order);
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      }
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  if ((regno == -1) || (regno == mips_regnum (gdbarch)->pc))
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    {
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      regi = mips_regnum (gdbarch)->pc;
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      size = register_size (gdbarch, regi);
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      regcache_raw_collect (regcache, regi, buf);
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      *(regp + CTX_EPC) = extract_signed_integer (buf, size, byte_order);
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    }
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  if ((regno == -1) || (regno == mips_regnum (gdbarch)->cause))
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    {
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      regi = mips_regnum (gdbarch)->cause;
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      size = register_size (gdbarch, regi);
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      regcache_raw_collect (regcache, regi, buf);
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      *(regp + CTX_CAUSE) = extract_signed_integer (buf, size, byte_order);
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    }
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  if ((regno == -1) || (regno == mips_regnum (gdbarch)->hi))
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    {
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      regi = mips_regnum (gdbarch)->hi;
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      size = register_size (gdbarch, regi);
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      regcache_raw_collect (regcache, regi, buf);
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      *(regp + CTX_MDHI) = extract_signed_integer (buf, size, byte_order);
123
    }
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125
  if ((regno == -1) || (regno == mips_regnum (gdbarch)->lo))
126
    {
127
      regi = mips_regnum (gdbarch)->lo;
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      size = register_size (gdbarch, regi);
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      regcache_raw_collect (regcache, regi, buf);
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      *(regp + CTX_MDLO) = extract_signed_integer (buf, size, byte_order);
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    }
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}
133
 
134
/*
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 * Now we do the same thing for floating-point registers.
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 * 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};
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  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,
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                         (const char *) &fpregsetp->fp_r.fp_regs[regi]);
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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
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     is 32bits long, while the regcache expects a 64bits long value.
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     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);
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164
  regcache_raw_supply (regcache,
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                       mips_regnum (gdbarch)->fp_control_status, fsrbuf);
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  /* FIXME: how can we supply FCRIR?  SGI doesn't tell us. */
168
  regcache_raw_supply (regcache,
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                       mips_regnum (gdbarch)->fp_implementation_revision,
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                       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);
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       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)]);
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          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];
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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.
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         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:
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219
     2 --- the floating-point register set
220
   However, for Irix 5, WHICH isn't used.
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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
}

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