1 /* GNU/Linux/MIPS specific low level interface, for the remote server for GDB.
2 Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2006, 2007
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
23 #include "linux-low.h"
25 #include <sys/ptrace.h>
28 #include "gdb_proc_service.h"
30 #ifndef PTRACE_GET_THREAD_AREA
31 #define PTRACE_GET_THREAD_AREA 25
38 #define mips_num_regs 90
40 #include <asm/ptrace.h>
46 /* Deliberately signed, for proper sign extension. */
51 /* Return the ptrace ``address'' of register REGNO. */
53 /* Matches mips_generic32_regs */
54 static int mips_regmap[] = {
55 0, 1, 2, 3, 4, 5, 6, 7,
56 8, 9, 10, 11, 12, 13, 14, 15,
57 16, 17, 18, 19, 20, 21, 22, 23,
58 24, 25, 26, 27, 28, 29, 30, 31,
60 -1, MMLO, MMHI, BADVADDR, CAUSE, PC,
62 FPR_BASE, FPR_BASE + 1, FPR_BASE + 2, FPR_BASE + 3,
63 FPR_BASE + 4, FPR_BASE + 5, FPR_BASE + 6, FPR_BASE + 7,
64 FPR_BASE + 8, FPR_BASE + 8, FPR_BASE + 10, FPR_BASE + 11,
65 FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15,
66 FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19,
67 FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23,
68 FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27,
69 FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31,
73 -1, -1, -1, -1, -1, -1, -1, -1,
74 -1, -1, -1, -1, -1, -1, -1, -1,
77 /* From mips-linux-nat.c. */
79 /* Pseudo registers can not be read. ptrace does not provide a way to
80 read (or set) PS_REGNUM, and there's no point in reading or setting
81 ZERO_REGNUM. We also can not set BADVADDR, CAUSE, or FCRIR via
85 mips_cannot_fetch_register (int regno)
87 if (mips_regmap[regno] == -1)
90 if (find_regno ("zero") == regno)
97 mips_cannot_store_register (int regno)
99 if (mips_regmap[regno] == -1)
102 if (find_regno ("zero") == regno)
105 if (find_regno ("cause") == regno)
108 if (find_regno ("bad") == regno)
111 if (find_regno ("fir") == regno)
120 union mips_register pc;
121 collect_register_by_name ("pc", pc.buf);
122 return register_size (0) == 4 ? pc.reg32 : pc.reg64;
126 mips_set_pc (CORE_ADDR pc)
128 union mips_register newpc;
129 if (register_size (0) == 4)
134 supply_register_by_name ("pc", newpc.buf);
137 /* Correct in either endianness. */
138 static const unsigned int mips_breakpoint = 0x0005000d;
139 #define mips_breakpoint_len 4
141 /* We only place breakpoints in empty marker functions, and thread locking
142 is outside of the function. So rather than importing software single-step,
143 we can just run until exit. */
145 mips_reinsert_addr ()
147 union mips_register ra;
148 collect_register_by_name ("ra", ra.buf);
149 return register_size (0) == 4 ? ra.reg32 : ra.reg64;
153 mips_breakpoint_at (CORE_ADDR where)
157 (*the_target->read_memory) (where, (unsigned char *) &insn, 4);
158 if (insn == mips_breakpoint)
161 /* If necessary, recognize more trap instructions here. GDB only uses the
166 /* Fetch the thread-local storage pointer for libthread_db. */
169 ps_get_thread_area (const struct ps_prochandle *ph,
170 lwpid_t lwpid, int idx, void **base)
172 if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
175 /* IDX is the bias from the thread pointer to the beginning of the
176 thread descriptor. It has to be subtracted due to implementation
177 quirks in libthread_db. */
178 *base = (void *) ((char *)*base - idx);
183 #ifdef HAVE_PTRACE_GETREGS
186 mips_collect_register (int use_64bit, int regno, union mips_register *reg)
188 union mips_register tmp_reg;
192 collect_register (regno, &tmp_reg.reg64);
197 collect_register (regno, &tmp_reg.reg32);
198 reg->reg64 = tmp_reg.reg32;
203 mips_supply_register (int use_64bit, int regno, const union mips_register *reg)
207 /* For big-endian 32-bit targets, ignore the high four bytes of each
209 if (__BYTE_ORDER == __BIG_ENDIAN && !use_64bit)
212 supply_register (regno, reg->buf + offset);
216 mips_collect_register_32bit (int use_64bit, int regno, unsigned char *buf)
218 union mips_register tmp_reg;
221 mips_collect_register (use_64bit, regno, &tmp_reg);
222 reg32 = tmp_reg.reg64;
223 memcpy (buf, ®32, 4);
227 mips_supply_register_32bit (int use_64bit, int regno, const unsigned char *buf)
229 union mips_register tmp_reg;
232 memcpy (®32, buf, 4);
233 tmp_reg.reg64 = reg32;
234 mips_supply_register (use_64bit, regno, &tmp_reg);
238 mips_fill_gregset (void *buf)
240 union mips_register *regset = buf;
243 use_64bit = (register_size (0) == 8);
245 for (i = 0; i < 32; i++)
246 mips_collect_register (use_64bit, i, regset + i);
248 mips_collect_register (use_64bit, find_regno ("lo"), regset + 32);
249 mips_collect_register (use_64bit, find_regno ("hi"), regset + 33);
250 mips_collect_register (use_64bit, find_regno ("pc"), regset + 34);
251 mips_collect_register (use_64bit, find_regno ("bad"), regset + 35);
252 mips_collect_register (use_64bit, find_regno ("sr"), regset + 36);
253 mips_collect_register (use_64bit, find_regno ("cause"), regset + 37);
257 mips_store_gregset (const void *buf)
259 const union mips_register *regset = buf;
262 use_64bit = (register_size (0) == 8);
264 for (i = 0; i < 32; i++)
265 mips_supply_register (use_64bit, i, regset + i);
267 mips_supply_register (use_64bit, find_regno ("lo"), regset + 32);
268 mips_supply_register (use_64bit, find_regno ("hi"), regset + 33);
269 mips_supply_register (use_64bit, find_regno ("pc"), regset + 34);
270 mips_supply_register (use_64bit, find_regno ("bad"), regset + 35);
271 mips_supply_register (use_64bit, find_regno ("sr"), regset + 36);
272 mips_supply_register (use_64bit, find_regno ("cause"), regset + 37);
276 mips_fill_fpregset (void *buf)
278 union mips_register *regset = buf;
279 int i, use_64bit, first_fp, big_endian;
281 use_64bit = (register_size (0) == 8);
282 first_fp = find_regno ("f0");
283 big_endian = (__BYTE_ORDER == __BIG_ENDIAN);
285 /* See GDB for a discussion of this peculiar layout. */
286 for (i = 0; i < 32; i++)
288 collect_register (first_fp + i, regset[i].buf);
290 collect_register (first_fp + i,
291 regset[i & ~1].buf + 4 * (big_endian != (i & 1)));
293 mips_collect_register_32bit (use_64bit, find_regno ("fsr"), regset[32].buf);
294 mips_collect_register_32bit (use_64bit, find_regno ("fir"),
299 mips_store_fpregset (const void *buf)
301 const union mips_register *regset = buf;
302 int i, use_64bit, first_fp, big_endian;
304 use_64bit = (register_size (0) == 8);
305 first_fp = find_regno ("f0");
306 big_endian = (__BYTE_ORDER == __BIG_ENDIAN);
308 /* See GDB for a discussion of this peculiar layout. */
309 for (i = 0; i < 32; i++)
311 supply_register (first_fp + i, regset[i].buf);
313 supply_register (first_fp + i,
314 regset[i & ~1].buf + 4 * (big_endian != (i & 1)));
316 mips_supply_register_32bit (use_64bit, find_regno ("fsr"), regset[32].buf);
317 mips_supply_register_32bit (use_64bit, find_regno ("fir"),
320 #endif /* HAVE_PTRACE_GETREGS */
322 struct regset_info target_regsets[] = {
323 #ifdef HAVE_PTRACE_GETREGS
324 { PTRACE_GETREGS, PTRACE_SETREGS, 38 * 8, GENERAL_REGS,
325 mips_fill_gregset, mips_store_gregset },
326 { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 33 * 8, FP_REGS,
327 mips_fill_fpregset, mips_store_fpregset },
328 #endif /* HAVE_PTRACE_GETREGS */
329 { 0, 0, -1, -1, NULL, NULL }
332 struct linux_target_ops the_low_target = {
335 mips_cannot_fetch_register,
336 mips_cannot_store_register,
339 (const unsigned char *) &mips_breakpoint,