1 /* Native support for the SGI Iris running IRIX version 5, for GDB.
2
3 Copyright (C) 1988-2013 Free Software Foundation, Inc.
4
5 Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
6 and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
7 Implemented for Irix 4.x by Garrett A. Wollman.
8 Modified for Irix 5.x by Ian Lance Taylor.
9
10 This file is part of GDB.
11
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 3 of the License, or
15 (at your option) any later version.
16
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
21
22 You should have received a copy of the GNU General Public License
23 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24
25 #include "defs.h"
26 #include "inferior.h"
27 #include "gdbcore.h"
28 #include "target.h"
29 #include "regcache.h"
30 #include "procfs.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
41 static 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
52 void
supply_gregset(struct regcache * regcache,const gregset_t * gregsetp)53 supply_gregset (struct regcache *regcache, const gregset_t *gregsetp)
54 {
55 int regi;
56 const greg_t *regp = &(*gregsetp)[0];
57 struct gdbarch *gdbarch = get_regcache_arch (regcache);
58 int gregoff = sizeof (greg_t) - mips_isa_regsize (gdbarch);
59 static char zerobuf[32] = {0};
60
61 for (regi = 0; regi <= CTX_RA; regi++)
62 regcache_raw_supply (regcache, regi,
63 (const char *) (regp + regi) + gregoff);
64
65 regcache_raw_supply (regcache, mips_regnum (gdbarch)->pc,
66 (const char *) (regp + CTX_EPC) + gregoff);
67 regcache_raw_supply (regcache, mips_regnum (gdbarch)->hi,
68 (const char *) (regp + CTX_MDHI) + gregoff);
69 regcache_raw_supply (regcache, mips_regnum (gdbarch)->lo,
70 (const char *) (regp + CTX_MDLO) + gregoff);
71 regcache_raw_supply (regcache, mips_regnum (gdbarch)->cause,
72 (const char *) (regp + CTX_CAUSE) + gregoff);
73
74 /* Fill inaccessible registers with zero. */
75 regcache_raw_supply (regcache, mips_regnum (gdbarch)->badvaddr, zerobuf);
76 }
77
78 void
fill_gregset(const struct regcache * regcache,gregset_t * gregsetp,int regno)79 fill_gregset (const struct regcache *regcache, gregset_t *gregsetp, int regno)
80 {
81 int regi, size;
82 greg_t *regp = &(*gregsetp)[0];
83 gdb_byte buf[MAX_REGISTER_SIZE];
84 struct gdbarch *gdbarch = get_regcache_arch (regcache);
85 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
86
87 /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
88 executable, we have to sign extend the registers to 64 bits before
89 filling in the gregset structure. */
90
91 for (regi = 0; regi <= CTX_RA; regi++)
92 if ((regno == -1) || (regno == regi))
93 {
94 size = register_size (gdbarch, regi);
95 regcache_raw_collect (regcache, regi, buf);
96 *(regp + regi) = extract_signed_integer (buf, size, byte_order);
97 }
98
99 if ((regno == -1) || (regno == mips_regnum (gdbarch)->pc))
100 {
101 regi = mips_regnum (gdbarch)->pc;
102 size = register_size (gdbarch, regi);
103 regcache_raw_collect (regcache, regi, buf);
104 *(regp + CTX_EPC) = extract_signed_integer (buf, size, byte_order);
105 }
106
107 if ((regno == -1) || (regno == mips_regnum (gdbarch)->cause))
108 {
109 regi = mips_regnum (gdbarch)->cause;
110 size = register_size (gdbarch, regi);
111 regcache_raw_collect (regcache, regi, buf);
112 *(regp + CTX_CAUSE) = extract_signed_integer (buf, size, byte_order);
113 }
114
115 if ((regno == -1) || (regno == mips_regnum (gdbarch)->hi))
116 {
117 regi = mips_regnum (gdbarch)->hi;
118 size = register_size (gdbarch, regi);
119 regcache_raw_collect (regcache, regi, buf);
120 *(regp + CTX_MDHI) = extract_signed_integer (buf, size, byte_order);
121 }
122
123 if ((regno == -1) || (regno == mips_regnum (gdbarch)->lo))
124 {
125 regi = mips_regnum (gdbarch)->lo;
126 size = register_size (gdbarch, regi);
127 regcache_raw_collect (regcache, regi, buf);
128 *(regp + CTX_MDLO) = extract_signed_integer (buf, size, byte_order);
129 }
130 }
131
132 /*
133 * Now we do the same thing for floating-point registers.
134 * We don't bother to condition on gdbarch_fp0_regnum since any
135 * reasonable MIPS configuration has an R3010 in it.
136 *
137 * Again, see the comments in m68k-tdep.c.
138 */
139
140 void
supply_fpregset(struct regcache * regcache,const fpregset_t * fpregsetp)141 supply_fpregset (struct regcache *regcache, const fpregset_t *fpregsetp)
142 {
143 int regi;
144 static char zerobuf[32] = {0};
145 char fsrbuf[8];
146 struct gdbarch *gdbarch = get_regcache_arch (regcache);
147
148 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
149
150 for (regi = 0; regi < 32; regi++)
151 regcache_raw_supply (regcache, gdbarch_fp0_regnum (gdbarch) + regi,
152 (const char *) &fpregsetp->__fp_r.__fp_regs[regi]);
153
154 /* We can't supply the FSR register directly to the regcache,
155 because there is a size issue: On one hand, fpregsetp->fp_csr
156 is 32bits long, while the regcache expects a 64bits long value.
157 So we use a buffer of the correct size and copy into it the register
158 value at the proper location. */
159 memset (fsrbuf, 0, 4);
160 memcpy (fsrbuf + 4, &fpregsetp->__fp_csr, 4);
161
162 regcache_raw_supply (regcache,
163 mips_regnum (gdbarch)->fp_control_status, fsrbuf);
164
165 /* FIXME: how can we supply FCRIR? SGI doesn't tell us. */
166 regcache_raw_supply (regcache,
167 mips_regnum (gdbarch)->fp_implementation_revision,
168 zerobuf);
169 }
170
171 void
fill_fpregset(const struct regcache * regcache,fpregset_t * fpregsetp,int regno)172 fill_fpregset (const struct regcache *regcache,
173 fpregset_t *fpregsetp, int regno)
174 {
175 int regi;
176 char *from, *to;
177 struct gdbarch *gdbarch = get_regcache_arch (regcache);
178
179 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
180
181 for (regi = gdbarch_fp0_regnum (gdbarch);
182 regi < gdbarch_fp0_regnum (gdbarch) + 32; regi++)
183 {
184 if ((regno == -1) || (regno == regi))
185 {
186 const int fp0_regnum = gdbarch_fp0_regnum (gdbarch);
187
188 to = (char *) &(fpregsetp->__fp_r.__fp_regs[regi - fp0_regnum]);
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
fetch_core_registers(struct regcache * regcache,char * core_reg_sect,unsigned core_reg_size,int which,CORE_ADDR reg_addr)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
_initialize_irix5_nat(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 }
275