2002-02-20 Daniel Jacobowitz <drow@mvista.com>
[deliverable/binutils-gdb.git] / gdb / mips-linux-tdep.c
CommitLineData
2aa830e4
DJ
1/* Target-dependent code for Linux/MIPS.
2 Copyright 2001 Free Software Foundation, Inc.
3
4 This file is part of GDB.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
20
21#include "defs.h"
22#include "gdbcore.h"
23#include "target.h"
24#include "solib-svr4.h"
25
26/* Copied from <asm/elf.h>. */
27#define ELF_NGREG 45
28#define ELF_NFPREG 33
29
30typedef unsigned char elf_greg_t[4];
31typedef elf_greg_t elf_gregset_t[ELF_NGREG];
32
33typedef unsigned char elf_fpreg_t[8];
34typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
35
36/* 0 - 31 are integer registers, 32 - 63 are fp registers. */
37#define FPR_BASE 32
38#define PC 64
39#define CAUSE 65
40#define BADVADDR 66
41#define MMHI 67
42#define MMLO 68
43#define FPC_CSR 69
44#define FPC_EIR 70
45
46#define EF_REG0 6
47#define EF_REG31 37
48#define EF_LO 38
49#define EF_HI 39
50#define EF_CP0_EPC 40
51#define EF_CP0_BADVADDR 41
52#define EF_CP0_STATUS 42
53#define EF_CP0_CAUSE 43
54
55#define EF_SIZE 180
56
57/* Figure out where the longjmp will land.
58 We expect the first arg to be a pointer to the jmp_buf structure from
59 which we extract the pc (JB_PC) that we will land at. The pc is copied
60 into PC. This routine returns 1 on success. */
61
62int
63mips_linux_get_longjmp_target (CORE_ADDR *pc)
64{
65 CORE_ADDR jb_addr;
66 char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
67
68 jb_addr = read_register (A0_REGNUM);
69
70 if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
71 TARGET_PTR_BIT / TARGET_CHAR_BIT))
72 return 0;
73
74 *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
75
76 return 1;
77}
78
79/* Unpack an elf_gregset_t into GDB's register cache. */
80
81void
82supply_gregset (elf_gregset_t *gregsetp)
83{
84 int regi;
85 elf_greg_t *regp = *gregsetp;
86 static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
87
88 for (regi = EF_REG0; regi <= EF_REG31; regi++)
89 supply_register ((regi - EF_REG0), (char *)(regp + regi));
90
91 supply_register (LO_REGNUM, (char *)(regp + EF_LO));
92 supply_register (HI_REGNUM, (char *)(regp + EF_HI));
93
94 supply_register (PC_REGNUM, (char *)(regp + EF_CP0_EPC));
95 supply_register (BADVADDR_REGNUM, (char *)(regp + EF_CP0_BADVADDR));
96 supply_register (PS_REGNUM, (char *)(regp + EF_CP0_STATUS));
97 supply_register (CAUSE_REGNUM, (char *)(regp + EF_CP0_CAUSE));
98
99 /* Fill inaccessible registers with zero. */
100 supply_register (FP_REGNUM, zerobuf);
101 supply_register (UNUSED_REGNUM, zerobuf);
102 for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
103 supply_register (regi, zerobuf);
104}
105
106/* Pack our registers (or one register) into an elf_gregset_t. */
107
108void
109fill_gregset (elf_gregset_t *gregsetp, int regno)
110{
111 int regaddr, regi;
112 elf_greg_t *regp = *gregsetp;
113 void *src, *dst;
114
115 if (regno == -1)
116 {
117 memset (regp, 0, sizeof (elf_gregset_t));
118 for (regi = 0; regi < 32; regi++)
119 fill_gregset (gregsetp, regi);
120 fill_gregset (gregsetp, LO_REGNUM);
121 fill_gregset (gregsetp, HI_REGNUM);
122 fill_gregset (gregsetp, PC_REGNUM);
123 fill_gregset (gregsetp, BADVADDR_REGNUM);
124 fill_gregset (gregsetp, PS_REGNUM);
125 fill_gregset (gregsetp, CAUSE_REGNUM);
126
127 return;
128 }
129
130 if (regno < 32)
131 {
132 src = &registers[REGISTER_BYTE (regno)];
133 dst = regp + regno + EF_REG0;
134 memcpy (dst, src, sizeof (elf_greg_t));
135 return;
136 }
137
138 regaddr = -1;
139 switch (regno)
140 {
141 case LO_REGNUM:
142 regaddr = EF_LO;
143 break;
144 case HI_REGNUM:
145 regaddr = EF_HI;
146 break;
147 case PC_REGNUM:
148 regaddr = EF_CP0_EPC;
149 break;
150 case BADVADDR_REGNUM:
151 regaddr = EF_CP0_BADVADDR;
152 break;
153 case PS_REGNUM:
154 regaddr = EF_CP0_STATUS;
155 break;
156 case CAUSE_REGNUM:
157 regaddr = EF_CP0_CAUSE;
158 break;
159 }
160
161 if (regaddr != -1)
162 {
163 src = &registers[REGISTER_BYTE (regno)];
164 dst = regp + regaddr;
165 memcpy (dst, src, sizeof (elf_greg_t));
166 }
167}
168
169/* Likewise, unpack an elf_fpregset_t. */
170
171void
172supply_fpregset (elf_fpregset_t *fpregsetp)
173{
174 register int regi;
175 static char zerobuf[MAX_REGISTER_RAW_SIZE] = {0};
176
177 for (regi = 0; regi < 32; regi++)
178 supply_register (FP0_REGNUM + regi,
179 (char *)(*fpregsetp + regi));
180
181 supply_register (FCRCS_REGNUM, (char *)(*fpregsetp + 32));
182
183 /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
184 supply_register (FCRIR_REGNUM, zerobuf);
185}
186
187/* Likewise, pack one or all floating point registers into an
188 elf_fpregset_t. */
189
190void
191fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
192{
193 char *from, *to;
194
195 if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
196 {
197 from = (char *) &registers[REGISTER_BYTE (regno)];
198 to = (char *) (*fpregsetp + regno - FP0_REGNUM);
199 memcpy (to, from, REGISTER_RAW_SIZE (regno - FP0_REGNUM));
200 }
201 else if (regno == FCRCS_REGNUM)
202 {
203 from = (char *) &registers[REGISTER_BYTE (regno)];
204 to = (char *) (*fpregsetp + 32);
205 memcpy (to, from, REGISTER_RAW_SIZE (regno));
206 }
207 else if (regno == -1)
208 {
209 int regi;
210
211 for (regi = 0; regi < 32; regi++)
212 fill_fpregset (fpregsetp, FP0_REGNUM + regi);
213 fill_fpregset(fpregsetp, FCRCS_REGNUM);
214 }
215}
216
217/* Map gdb internal register number to ptrace ``address''.
218 These ``addresses'' are normally defined in <asm/ptrace.h>. */
219
220CORE_ADDR
221register_addr (int regno, CORE_ADDR blockend)
222{
223 int regaddr;
224
225 if (regno < 0 || regno >= NUM_REGS)
226 error ("Bogon register number %d.", regno);
227
228 if (regno < 32)
229 regaddr = regno;
230 else if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
231 regaddr = FPR_BASE + (regno - FP0_REGNUM);
232 else if (regno == PC_REGNUM)
233 regaddr = PC;
234 else if (regno == CAUSE_REGNUM)
235 regaddr = CAUSE;
236 else if (regno == BADVADDR_REGNUM)
237 regaddr = BADVADDR;
238 else if (regno == LO_REGNUM)
239 regaddr = MMLO;
240 else if (regno == HI_REGNUM)
241 regaddr = MMHI;
242 else if (regno == FCRCS_REGNUM)
243 regaddr = FPC_CSR;
244 else if (regno == FCRIR_REGNUM)
245 regaddr = FPC_EIR;
246 else
247 error ("Unknowable register number %d.", regno);
248
249 return regaddr;
250}
251
252/* Use a local version of this function to get the correct types for
253 regsets, until multi-arch core support is ready. */
254
255static void
256fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
257 int which, CORE_ADDR reg_addr)
258{
259 elf_gregset_t gregset;
260 elf_fpregset_t fpregset;
261
262 if (which == 0)
263 {
264 if (core_reg_size != sizeof (gregset))
265 {
266 warning ("wrong size gregset struct in core file");
267 }
268 else
269 {
270 memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
271 supply_gregset (&gregset);
272 }
273 }
274 else if (which == 2)
275 {
276 if (core_reg_size != sizeof (fpregset))
277 {
278 warning ("wrong size fpregset struct in core file");
279 }
280 else
281 {
282 memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
283 supply_fpregset (&fpregset);
284 }
285 }
286}
287
288/* Register that we are able to handle ELF file formats using standard
289 procfs "regset" structures. */
290
291static struct core_fns regset_core_fns =
292{
293 bfd_target_elf_flavour, /* core_flavour */
294 default_check_format, /* check_format */
295 default_core_sniffer, /* core_sniffer */
296 fetch_core_registers, /* core_read_registers */
297 NULL /* next */
298};
299
300/* Fetch (and possibly build) an appropriate link_map_offsets
301 structure for native Linux/MIPS targets using the struct offsets
302 defined in link.h (but without actual reference to that file).
303
304 This makes it possible to access Linux/MIPS shared libraries from a
305 GDB that was not built on an Linux/MIPS host (for cross debugging). */
306
307struct link_map_offsets *
308mips_linux_svr4_fetch_link_map_offsets (void)
309{
310 static struct link_map_offsets lmo;
311 static struct link_map_offsets *lmp = NULL;
312
313 if (lmp == NULL)
314 {
315 lmp = &lmo;
316
317 lmo.r_debug_size = 8; /* The actual size is 20 bytes, but
318 this is all we need. */
319 lmo.r_map_offset = 4;
320 lmo.r_map_size = 4;
321
322 lmo.link_map_size = 20;
323
324 lmo.l_addr_offset = 0;
325 lmo.l_addr_size = 4;
326
327 lmo.l_name_offset = 4;
328 lmo.l_name_size = 4;
329
330 lmo.l_next_offset = 12;
331 lmo.l_next_size = 4;
332
333 lmo.l_prev_offset = 16;
334 lmo.l_prev_size = 4;
335 }
336
337 return lmp;
338}
339
340void
d1bacddc 341_initialize_mips_linux_tdep (void)
2aa830e4
DJ
342{
343 add_core_fns (&regset_core_fns);
344}
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