aboutsummaryrefslogtreecommitdiff
path: root/gdb/irix5-nat.c
blob: 129742fb6d8a1aecf87e09bbfd664570431b131d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
/* Native support for the SGI Iris running IRIX version 5, for GDB.

   Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
   1998, 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.

   Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
   and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
   Implemented for Irix 4.x by Garrett A. Wollman.
   Modified for Irix 5.x by Ian Lance Taylor.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "inferior.h"
#include "gdbcore.h"
#include "target.h"
#include "regcache.h"

#include "gdb_string.h"
#include <sys/time.h>
#include <sys/procfs.h>
#include <setjmp.h>		/* For JB_XXX.  */

/* Prototypes for supply_gregset etc. */
#include "gregset.h"
#include "mips-tdep.h"

static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR);

/* Size of elements in jmpbuf */

#define JB_ELEMENT_SIZE 4

/*
 * See the comment in m68k-tdep.c regarding the utility of these functions.
 *
 * These definitions are from the MIPS SVR4 ABI, so they may work for
 * any MIPS SVR4 target.
 */

void
supply_gregset (gregset_t *gregsetp)
{
  int regi;
  greg_t *regp = &(*gregsetp)[0];
  int gregoff = sizeof (greg_t) - mips_isa_regsize (current_gdbarch);
  static char zerobuf[32] = {0};

  for (regi = 0; regi <= CTX_RA; regi++)
    regcache_raw_supply (current_regcache, regi,
			 (char *) (regp + regi) + gregoff);

  regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->pc,
		       (char *) (regp + CTX_EPC) + gregoff);
  regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->hi,
		       (char *) (regp + CTX_MDHI) + gregoff);
  regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->lo,
		       (char *) (regp + CTX_MDLO) + gregoff);
  regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->cause,
		       (char *) (regp + CTX_CAUSE) + gregoff);

  /* Fill inaccessible registers with zero.  */
  regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->badvaddr, zerobuf);
}

void
fill_gregset (gregset_t *gregsetp, int regno)
{
  int regi;
  greg_t *regp = &(*gregsetp)[0];

  /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
     executable, we have to sign extend the registers to 64 bits before
     filling in the gregset structure.  */

  for (regi = 0; regi <= CTX_RA; regi++)
    if ((regno == -1) || (regno == regi))
      *(regp + regi) =
	extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (regi)],
				register_size (current_gdbarch, regi));

  if ((regno == -1) || (regno == PC_REGNUM))
    *(regp + CTX_EPC) =
      extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->pc)],
			      register_size (current_gdbarch, mips_regnum (current_gdbarch)->pc));

  if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->cause))
    *(regp + CTX_CAUSE) =
      extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->cause)],
			      register_size (current_gdbarch, mips_regnum (current_gdbarch)->cause));

  if ((regno == -1)
      || (regno == mips_regnum (current_gdbarch)->hi))
    *(regp + CTX_MDHI) =
      extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->hi)],
			      register_size (current_gdbarch, mips_regnum (current_gdbarch)->hi));

  if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->lo))
    *(regp + CTX_MDLO) =
      extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->lo)],
			      register_size (current_gdbarch, mips_regnum (current_gdbarch)->lo));
}

/*
 * Now we do the same thing for floating-point registers.
 * We don't bother to condition on FP0_REGNUM since any
 * reasonable MIPS configuration has an R3010 in it.
 *
 * Again, see the comments in m68k-tdep.c.
 */

void
supply_fpregset (fpregset_t *fpregsetp)
{
  int regi;
  static char zerobuf[32] = {0};

  /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */

  for (regi = 0; regi < 32; regi++)
    regcache_raw_supply (current_regcache, FP0_REGNUM + regi,
			 (char *) &fpregsetp->fp_r.fp_regs[regi]);

  regcache_raw_supply (current_regcache,
		       mips_regnum (current_gdbarch)->fp_control_status,
		       (char *) &fpregsetp->fp_csr);

  /* FIXME: how can we supply FCRIR?  SGI doesn't tell us. */
  regcache_raw_supply (current_regcache,
		       mips_regnum (current_gdbarch)->fp_implementation_revision,
		       zerobuf);
}

void
fill_fpregset (fpregset_t *fpregsetp, int regno)
{
  int regi;
  char *from, *to;

  /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */

  for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
    {
      if ((regno == -1) || (regno == regi))
	{
	  from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regi)];
	  to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
	  memcpy (to, from, register_size (current_gdbarch, regi));
	}
    }

  if ((regno == -1)
      || (regno == mips_regnum (current_gdbarch)->fp_control_status))
    fpregsetp->fp_csr = *(unsigned *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->fp_control_status)];
}


/* Figure out where the longjmp will land.
   We expect the first arg to be a pointer to the jmp_buf structure from which
   we extract the pc (JB_PC) that we will land at.  The pc is copied into PC.
   This routine returns true on success. */

int
get_longjmp_target (CORE_ADDR *pc)
{
  char *buf;
  CORE_ADDR jb_addr;

  buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
  jb_addr = read_register (A0_REGNUM);

  if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
			  TARGET_PTR_BIT / TARGET_CHAR_BIT))
    return 0;

  *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);

  return 1;
}

/* Provide registers to GDB from a core file.

   CORE_REG_SECT points to an array of bytes, which were obtained from
   a core file which BFD thinks might contain register contents. 
   CORE_REG_SIZE is its size.

   Normally, WHICH says which register set corelow suspects this is:
     0 --- the general-purpose register set
     2 --- the floating-point register set
   However, for Irix 5, WHICH isn't used.

   REG_ADDR is also unused.  */

static void
fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
		      int which, CORE_ADDR reg_addr)
{
  if (core_reg_size == DEPRECATED_REGISTER_BYTES)
    {
      memcpy ((char *) deprecated_registers, core_reg_sect, core_reg_size);
    }
  else if (mips_isa_regsize (current_gdbarch) == 4 &&
	   core_reg_size == (2 * mips_isa_regsize (current_gdbarch)) * NUM_REGS)
    {
      /* This is a core file from a N32 executable, 64 bits are saved
         for all registers.  */
      char *srcp = core_reg_sect;
      char *dstp = deprecated_registers;
      int regno;

      for (regno = 0; regno < NUM_REGS; regno++)
	{
	  if (regno >= FP0_REGNUM && regno < (FP0_REGNUM + 32))
	    {
	      /* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB
	         currently assumes that they are 32 bit.  */
	      *dstp++ = *srcp++;
	      *dstp++ = *srcp++;
	      *dstp++ = *srcp++;
	      *dstp++ = *srcp++;
	      if (register_size (current_gdbarch, regno) == 4)
		{
		  /* copying 4 bytes from eight bytes?
		     I don't see how this can be right...  */
		  srcp += 4;
		}
	      else
		{
		  /* copy all 8 bytes (sizeof(double)) */
		  *dstp++ = *srcp++;
		  *dstp++ = *srcp++;
		  *dstp++ = *srcp++;
		  *dstp++ = *srcp++;
		}
	    }
	  else
	    {
	      srcp += 4;
	      *dstp++ = *srcp++;
	      *dstp++ = *srcp++;
	      *dstp++ = *srcp++;
	      *dstp++ = *srcp++;
	    }
	}
    }
  else
    {
      warning ("wrong size gregset struct in core file");
      return;
    }

  deprecated_registers_fetched ();
}

/* Register that we are able to handle irix5 core file formats.
   This really is bfd_target_unknown_flavour */

static struct core_fns irix5_core_fns =
{
  bfd_target_unknown_flavour,		/* core_flavour */
  default_check_format,			/* check_format */
  default_core_sniffer,			/* core_sniffer */
  fetch_core_registers,			/* core_read_registers */
  NULL					/* next */
};

void
_initialize_core_irix5 (void)
{
  deprecated_add_core_fns (&irix5_core_fns);
}