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 Free Software 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
32#include "gdb_string.h"
33#include <sys/time.h>
34#include <sys/procfs.h>
35#include <setjmp.h>		/* For JB_XXX.  */
36
37/* Prototypes for supply_gregset etc. */
38#include "gregset.h"
39#include "mips-tdep.h"
40
41static void fetch_core_registers (struct regcache *, char *,
42				  unsigned int, int, CORE_ADDR);
43
44
45/*
46 * See the comment in m68k-tdep.c regarding the utility of these functions.
47 *
48 * These definitions are from the MIPS SVR4 ABI, so they may work for
49 * any MIPS SVR4 target.
50 */
51
52void
53supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
54{
55  int regi;
56  const greg_t *regp = &(*gregsetp)[0];
57  int gregoff = sizeof (greg_t) - mips_isa_regsize (current_gdbarch);
58  static char zerobuf[32] = {0};
59
60  for (regi = 0; regi <= CTX_RA; regi++)
61    regcache_raw_supply (regcache, regi,
62			 (const char *) (regp + regi) + gregoff);
63
64  regcache_raw_supply (regcache, mips_regnum (current_gdbarch)->pc,
65		       (const char *) (regp + CTX_EPC) + gregoff);
66  regcache_raw_supply (regcache, mips_regnum (current_gdbarch)->hi,
67		       (const char *) (regp + CTX_MDHI) + gregoff);
68  regcache_raw_supply (regcache, mips_regnum (current_gdbarch)->lo,
69		       (const char *) (regp + CTX_MDLO) + gregoff);
70  regcache_raw_supply (regcache, mips_regnum (current_gdbarch)->cause,
71		       (const char *) (regp + CTX_CAUSE) + gregoff);
72
73  /* Fill inaccessible registers with zero.  */
74  regcache_raw_supply (regcache, mips_regnum (current_gdbarch)->badvaddr, zerobuf);
75}
76
77void
78fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
79{
80  int regi, size;
81  greg_t *regp = &(*gregsetp)[0];
82  gdb_byte buf[MAX_REGISTER_SIZE];
83
84  /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
85     executable, we have to sign extend the registers to 64 bits before
86     filling in the gregset structure.  */
87
88  for (regi = 0; regi <= CTX_RA; regi++)
89    if ((regno == -1) || (regno == regi))
90      {
91	size = register_size (current_gdbarch, regi);
92	regcache_raw_collect (regcache, regi, buf);
93	*(regp + regi) = extract_signed_integer (buf, size);
94      }
95
96  if ((regno == -1) || (regno == gdbarch_pc_regnum (current_gdbarch)))
97    {
98      regi = mips_regnum (current_gdbarch)->pc;
99      size = register_size (current_gdbarch, regi);
100      regcache_raw_collect (regcache, regi, buf);
101      *(regp + CTX_EPC) = extract_signed_integer (buf, size);
102    }
103
104  if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->cause))
105    {
106      regi = mips_regnum (current_gdbarch)->cause;
107      size = register_size (current_gdbarch, regi);
108      regcache_raw_collect (regcache, regi, buf);
109      *(regp + CTX_CAUSE) = extract_signed_integer (buf, size);
110    }
111
112  if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->hi))
113    {
114      regi = mips_regnum (current_gdbarch)->hi;
115      size = register_size (current_gdbarch, regi);
116      regcache_raw_collect (regcache, regi, buf);
117      *(regp + CTX_MDHI) = extract_signed_integer (buf, size);
118    }
119
120  if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->lo))
121    {
122      regi = mips_regnum (current_gdbarch)->lo;
123      size = register_size (current_gdbarch, regi);
124      regcache_raw_collect (regcache, regi, buf);
125      *(regp + CTX_MDLO) = extract_signed_integer (buf, size);
126    }
127}
128
129/*
130 * Now we do the same thing for floating-point registers.
131 * We don't bother to condition on gdbarch_fp0_regnum since any
132 * reasonable MIPS configuration has an R3010 in it.
133 *
134 * Again, see the comments in m68k-tdep.c.
135 */
136
137void
138supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
139{
140  int regi;
141  static char zerobuf[32] = {0};
142  char fsrbuf[8];
143
144  /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
145
146  for (regi = 0; regi < 32; regi++)
147    regcache_raw_supply (regcache, gdbarch_fp0_regnum (current_gdbarch) + regi,
148			 (const char *) &fpregsetp->fp_r.fp_regs[regi]);
149
150  /* We can't supply the FSR register directly to the regcache,
151     because there is a size issue: On one hand, fpregsetp->fp_csr
152     is 32bits long, while the regcache expects a 64bits long value.
153     So we use a buffer of the correct size and copy into it the register
154     value at the proper location.  */
155  memset (fsrbuf, 0, 4);
156  memcpy (fsrbuf + 4, &fpregsetp->fp_csr, 4);
157
158  regcache_raw_supply (regcache,
159		       mips_regnum (current_gdbarch)->fp_control_status,
160		       fsrbuf);
161
162  /* FIXME: how can we supply FCRIR?  SGI doesn't tell us. */
163  regcache_raw_supply (regcache,
164		       mips_regnum (current_gdbarch)->fp_implementation_revision,
165		       zerobuf);
166}
167
168void
169fill_fpregset (const struct regcache *regcache, fpregset_t *fpregsetp, int regno)
170{
171  int regi;
172  char *from, *to;
173
174  /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
175
176  for (regi = gdbarch_fp0_regnum (current_gdbarch);
177       regi < gdbarch_fp0_regnum (current_gdbarch) + 32; regi++)
178    {
179      if ((regno == -1) || (regno == regi))
180	{
181	  to = (char *) &(fpregsetp->fp_r.fp_regs[regi - gdbarch_fp0_regnum
182							 (current_gdbarch)]);
183          regcache_raw_collect (regcache, regi, to);
184	}
185    }
186
187  if (regno == -1
188      || regno == mips_regnum (current_gdbarch)->fp_control_status)
189    {
190      char fsrbuf[8];
191
192      /* We can't fill the FSR register directly from the regcache,
193         because there is a size issue: On one hand, fpregsetp->fp_csr
194         is 32bits long, while the regcache expects a 64bits long buffer.
195         So we use a buffer of the correct size and copy the register
196         value from that buffer.  */
197      regcache_raw_collect (regcache,
198			    mips_regnum (current_gdbarch)->fp_control_status,
199			    fsrbuf);
200
201      memcpy (&fpregsetp->fp_csr, fsrbuf + 4, 4);
202    }
203}
204
205
206/* Provide registers to GDB from a core file.
207
208   CORE_REG_SECT points to an array of bytes, which were obtained from
209   a core file which BFD thinks might contain register contents.
210   CORE_REG_SIZE is its size.
211
212   Normally, WHICH says which register set corelow suspects this is:
213     0 --- the general-purpose register set
214     2 --- the floating-point register set
215   However, for Irix 5, WHICH isn't used.
216
217   REG_ADDR is also unused.  */
218
219static void
220fetch_core_registers (struct regcache *regcache,
221		      char *core_reg_sect, unsigned core_reg_size,
222		      int which, CORE_ADDR reg_addr)
223{
224  char *srcp = core_reg_sect;
225  int regsize = mips_isa_regsize (current_gdbarch);
226  int regno;
227
228  /* If regsize is 8, this is a N32 or N64 core file.
229     If regsize is 4, this is an O32 core file.  */
230  if (core_reg_size != regsize * gdbarch_num_regs (current_gdbarch))
231    {
232      warning (_("wrong size gregset struct in core file"));
233      return;
234    }
235
236  for (regno = 0; regno < gdbarch_num_regs (current_gdbarch); regno++)
237    {
238      regcache_raw_supply (regcache, regno, srcp);
239      srcp += regsize;
240    }
241}
242
243/* Register that we are able to handle irix5 core file formats.
244   This really is bfd_target_unknown_flavour */
245
246static struct core_fns irix5_core_fns =
247{
248  bfd_target_unknown_flavour,		/* core_flavour */
249  default_check_format,			/* check_format */
250  default_core_sniffer,			/* core_sniffer */
251  fetch_core_registers,			/* core_read_registers */
252  NULL					/* next */
253};
254
255void
256_initialize_core_irix5 (void)
257{
258  deprecated_add_core_fns (&irix5_core_fns);
259}
260