1 /* Native support for the SGI Iris running IRIX version 5, for GDB.
2
3 Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
4 1998, 1999, 2000, 2001, 2002, 2004 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 2 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, write to the Free Software
25 Foundation, Inc., 59 Temple Place - Suite 330,
26 Boston, MA 02111-1307, USA. */
27
28 #include "defs.h"
29 #include "inferior.h"
30 #include "gdbcore.h"
31 #include "target.h"
32 #include "regcache.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 (char *, unsigned int, int, CORE_ADDR);
44
45 /* Size of elements in jmpbuf */
46
47 #define JB_ELEMENT_SIZE 4
48
49 /*
50 * See the comment in m68k-tdep.c regarding the utility of these functions.
51 *
52 * These definitions are from the MIPS SVR4 ABI, so they may work for
53 * any MIPS SVR4 target.
54 */
55
56 void
supply_gregset(gregset_t * gregsetp)57 supply_gregset (gregset_t *gregsetp)
58 {
59 int regi;
60 greg_t *regp = &(*gregsetp)[0];
61 int gregoff = sizeof (greg_t) - mips_isa_regsize (current_gdbarch);
62 static char zerobuf[32] = {0};
63
64 for (regi = 0; regi <= CTX_RA; regi++)
65 supply_register (regi, (char *) (regp + regi) + gregoff);
66
67 supply_register (mips_regnum (current_gdbarch)->pc,
68 (char *) (regp + CTX_EPC) + gregoff);
69 supply_register (mips_regnum (current_gdbarch)->hi,
70 (char *) (regp + CTX_MDHI) + gregoff);
71 supply_register (mips_regnum (current_gdbarch)->lo,
72 (char *) (regp + CTX_MDLO) + gregoff);
73 supply_register (mips_regnum (current_gdbarch)->cause,
74 (char *) (regp + CTX_CAUSE) + gregoff);
75
76 /* Fill inaccessible registers with zero. */
77 supply_register (mips_regnum (current_gdbarch)->badvaddr, zerobuf);
78 }
79
80 void
fill_gregset(gregset_t * gregsetp,int regno)81 fill_gregset (gregset_t *gregsetp, int regno)
82 {
83 int regi;
84 greg_t *regp = &(*gregsetp)[0];
85
86 /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32
87 executable, we have to sign extend the registers to 64 bits before
88 filling in the gregset structure. */
89
90 for (regi = 0; regi <= CTX_RA; regi++)
91 if ((regno == -1) || (regno == regi))
92 *(regp + regi) =
93 extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (regi)],
94 DEPRECATED_REGISTER_RAW_SIZE (regi));
95
96 if ((regno == -1) || (regno == PC_REGNUM))
97 *(regp + CTX_EPC) =
98 extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->pc)],
99 DEPRECATED_REGISTER_RAW_SIZE (mips_regnum (current_gdbarch)->pc));
100
101 if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->cause))
102 *(regp + CTX_CAUSE) =
103 extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->cause)],
104 DEPRECATED_REGISTER_RAW_SIZE (mips_regnum (current_gdbarch)->cause));
105
106 if ((regno == -1)
107 || (regno == mips_regnum (current_gdbarch)->hi))
108 *(regp + CTX_MDHI) =
109 extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->hi)],
110 DEPRECATED_REGISTER_RAW_SIZE (mips_regnum (current_gdbarch)->hi));
111
112 if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->lo))
113 *(regp + CTX_MDLO) =
114 extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->lo)],
115 DEPRECATED_REGISTER_RAW_SIZE (mips_regnum (current_gdbarch)->lo));
116 }
117
118 /*
119 * Now we do the same thing for floating-point registers.
120 * We don't bother to condition on FP0_REGNUM since any
121 * reasonable MIPS configuration has an R3010 in it.
122 *
123 * Again, see the comments in m68k-tdep.c.
124 */
125
126 void
supply_fpregset(fpregset_t * fpregsetp)127 supply_fpregset (fpregset_t *fpregsetp)
128 {
129 int regi;
130 static char zerobuf[32] = {0};
131
132 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
133
134 for (regi = 0; regi < 32; regi++)
135 supply_register (FP0_REGNUM + regi,
136 (char *) &fpregsetp->fp_r.fp_regs[regi]);
137
138 supply_register (mips_regnum (current_gdbarch)->fp_control_status,
139 (char *) &fpregsetp->fp_csr);
140
141 /* FIXME: how can we supply FCRIR? SGI doesn't tell us. */
142 supply_register (mips_regnum (current_gdbarch)->fp_implementation_revision,
143 zerobuf);
144 }
145
146 void
fill_fpregset(fpregset_t * fpregsetp,int regno)147 fill_fpregset (fpregset_t *fpregsetp, int regno)
148 {
149 int regi;
150 char *from, *to;
151
152 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */
153
154 for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
155 {
156 if ((regno == -1) || (regno == regi))
157 {
158 from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regi)];
159 to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]);
160 memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regi));
161 }
162 }
163
164 if ((regno == -1)
165 || (regno == mips_regnum (current_gdbarch)->fp_control_status))
166 fpregsetp->fp_csr = *(unsigned *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->fp_control_status)];
167 }
168
169
170 /* Figure out where the longjmp will land.
171 We expect the first arg to be a pointer to the jmp_buf structure from which
172 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
173 This routine returns true on success. */
174
175 int
get_longjmp_target(CORE_ADDR * pc)176 get_longjmp_target (CORE_ADDR *pc)
177 {
178 char *buf;
179 CORE_ADDR jb_addr;
180
181 buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
182 jb_addr = read_register (A0_REGNUM);
183
184 if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
185 TARGET_PTR_BIT / TARGET_CHAR_BIT))
186 return 0;
187
188 *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
189
190 return 1;
191 }
192
193 /* Provide registers to GDB from a core file.
194
195 CORE_REG_SECT points to an array of bytes, which were obtained from
196 a core file which BFD thinks might contain register contents.
197 CORE_REG_SIZE is its size.
198
199 Normally, WHICH says which register set corelow suspects this is:
200 0 --- the general-purpose register set
201 2 --- the floating-point register set
202 However, for Irix 5, WHICH isn't used.
203
204 REG_ADDR is also unused. */
205
206 static void
fetch_core_registers(char * core_reg_sect,unsigned core_reg_size,int which,CORE_ADDR reg_addr)207 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
208 int which, CORE_ADDR reg_addr)
209 {
210 if (core_reg_size == DEPRECATED_REGISTER_BYTES)
211 {
212 memcpy ((char *) deprecated_registers, core_reg_sect, core_reg_size);
213 }
214 else if (mips_isa_regsize (current_gdbarch) == 4 &&
215 core_reg_size == (2 * mips_isa_regsize (current_gdbarch)) * NUM_REGS)
216 {
217 /* This is a core file from a N32 executable, 64 bits are saved
218 for all registers. */
219 char *srcp = core_reg_sect;
220 char *dstp = deprecated_registers;
221 int regno;
222
223 for (regno = 0; regno < NUM_REGS; regno++)
224 {
225 if (regno >= FP0_REGNUM && regno < (FP0_REGNUM + 32))
226 {
227 /* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB
228 currently assumes that they are 32 bit. */
229 *dstp++ = *srcp++;
230 *dstp++ = *srcp++;
231 *dstp++ = *srcp++;
232 *dstp++ = *srcp++;
233 if (DEPRECATED_REGISTER_RAW_SIZE (regno) == 4)
234 {
235 /* copying 4 bytes from eight bytes?
236 I don't see how this can be right... */
237 srcp += 4;
238 }
239 else
240 {
241 /* copy all 8 bytes (sizeof(double)) */
242 *dstp++ = *srcp++;
243 *dstp++ = *srcp++;
244 *dstp++ = *srcp++;
245 *dstp++ = *srcp++;
246 }
247 }
248 else
249 {
250 srcp += 4;
251 *dstp++ = *srcp++;
252 *dstp++ = *srcp++;
253 *dstp++ = *srcp++;
254 *dstp++ = *srcp++;
255 }
256 }
257 }
258 else
259 {
260 warning ("wrong size gregset struct in core file");
261 return;
262 }
263
264 deprecated_registers_fetched ();
265 }
266
267 /* Register that we are able to handle irix5 core file formats.
268 This really is bfd_target_unknown_flavour */
269
270 static struct core_fns irix5_core_fns =
271 {
272 bfd_target_unknown_flavour, /* core_flavour */
273 default_check_format, /* check_format */
274 default_core_sniffer, /* core_sniffer */
275 fetch_core_registers, /* core_read_registers */
276 NULL /* next */
277 };
278
279 void
_initialize_core_irix5(void)280 _initialize_core_irix5 (void)
281 {
282 deprecated_add_core_fns (&irix5_core_fns);
283 }
284