1 /* Native-dependent code for GNU/Linux on MIPS processors.
3 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
25 #include "mips-tdep.h"
28 #include "linux-nat.h"
29 #include "mips-linux-tdep.h"
31 #include "gdb_proc_service.h"
34 #include <sys/ptrace.h>
36 #ifndef PTRACE_GET_THREAD_AREA
37 #define PTRACE_GET_THREAD_AREA 25
40 /* Assume that we have PTRACE_GETREGS et al. support. If we do not,
41 we'll clear this and use PTRACE_PEEKUSER instead. */
42 static int have_ptrace_regsets = 1;
44 /* Saved function pointers to fetch and store a single register using
45 PTRACE_PEEKUSER and PTRACE_POKEUSER. */
47 void (*super_fetch_registers) (struct regcache *, int);
48 void (*super_store_registers) (struct regcache *, int);
50 /* Map gdb internal register number to ptrace ``address''.
51 These ``addresses'' are normally defined in <asm/ptrace.h>.
53 ptrace does not provide a way to read (or set) MIPS_PS_REGNUM,
54 and there's no point in reading or setting MIPS_ZERO_REGNUM.
55 We also can not set BADVADDR, CAUSE, or FCRIR via ptrace(). */
58 mips_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
62 if (regno < 0 || regno >= gdbarch_num_regs (current_gdbarch))
63 error (_("Bogon register number %d."), regno);
65 if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
67 else if ((regno >= mips_regnum (gdbarch)->fp0)
68 && (regno < mips_regnum (gdbarch)->fp0 + 32))
69 regaddr = FPR_BASE + (regno - mips_regnum (gdbarch)->fp0);
70 else if (regno == mips_regnum (gdbarch)->pc)
72 else if (regno == mips_regnum (gdbarch)->cause)
73 regaddr = store? (CORE_ADDR) -1 : CAUSE;
74 else if (regno == mips_regnum (gdbarch)->badvaddr)
75 regaddr = store? (CORE_ADDR) -1 : BADVADDR;
76 else if (regno == mips_regnum (gdbarch)->lo)
78 else if (regno == mips_regnum (gdbarch)->hi)
80 else if (regno == mips_regnum (gdbarch)->fp_control_status)
82 else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
83 regaddr = store? (CORE_ADDR) -1 : FPC_EIR;
85 regaddr = (CORE_ADDR) -1;
91 mips64_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
95 if (regno < 0 || regno >= gdbarch_num_regs (current_gdbarch))
96 error (_("Bogon register number %d."), regno);
98 if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
100 else if ((regno >= mips_regnum (gdbarch)->fp0)
101 && (regno < mips_regnum (gdbarch)->fp0 + 32))
102 regaddr = MIPS64_FPR_BASE + (regno - FP0_REGNUM);
103 else if (regno == mips_regnum (gdbarch)->pc)
105 else if (regno == mips_regnum (gdbarch)->cause)
106 regaddr = store? (CORE_ADDR) -1 : MIPS64_CAUSE;
107 else if (regno == mips_regnum (gdbarch)->badvaddr)
108 regaddr = store? (CORE_ADDR) -1 : MIPS64_BADVADDR;
109 else if (regno == mips_regnum (gdbarch)->lo)
110 regaddr = MIPS64_MMLO;
111 else if (regno == mips_regnum (gdbarch)->hi)
112 regaddr = MIPS64_MMHI;
113 else if (regno == mips_regnum (gdbarch)->fp_control_status)
114 regaddr = MIPS64_FPC_CSR;
115 else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
116 regaddr = store? (CORE_ADDR) -1 : MIPS64_FPC_EIR;
118 regaddr = (CORE_ADDR) -1;
123 /* Fetch the thread-local storage pointer for libthread_db. */
126 ps_get_thread_area (const struct ps_prochandle *ph,
127 lwpid_t lwpid, int idx, void **base)
129 if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
132 /* IDX is the bias from the thread pointer to the beginning of the
133 thread descriptor. It has to be subtracted due to implementation
134 quirks in libthread_db. */
135 *base = (void *) ((char *)*base - idx);
140 /* Wrapper functions. These are only used by libthread_db. */
143 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
145 if (mips_isa_regsize (current_gdbarch) == 4)
146 mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp);
148 mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp);
152 fill_gregset (const struct regcache *regcache,
153 gdb_gregset_t *gregsetp, int regno)
155 if (mips_isa_regsize (current_gdbarch) == 4)
156 mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno);
158 mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno);
162 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
164 if (mips_isa_regsize (current_gdbarch) == 4)
165 mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp);
167 mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp);
171 fill_fpregset (const struct regcache *regcache,
172 gdb_fpregset_t *fpregsetp, int regno)
174 if (mips_isa_regsize (current_gdbarch) == 4)
175 mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno);
177 mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno);
181 /* Fetch REGNO (or all registers if REGNO == -1) from the target
182 using PTRACE_GETREGS et al. */
185 mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno)
190 if (regno >= mips_regnum (current_gdbarch)->fp0
191 && regno <= mips_regnum (current_gdbarch)->fp0 + 32)
193 else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
195 else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
200 tid = ptid_get_lwp (inferior_ptid);
202 tid = ptid_get_pid (inferior_ptid);
204 if (regno == -1 || !is_fp)
206 mips64_elf_gregset_t regs;
208 if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
212 have_ptrace_regsets = 0;
215 perror_with_name (_("Couldn't get registers"));
218 mips64_supply_gregset (regcache,
219 (const mips64_elf_gregset_t *) ®s);
222 if (regno == -1 || is_fp)
224 mips64_elf_fpregset_t fp_regs;
226 if (ptrace (PTRACE_GETFPREGS, tid, 0L,
227 (PTRACE_TYPE_ARG3) &fp_regs) == -1)
231 have_ptrace_regsets = 0;
234 perror_with_name (_("Couldn't get FP registers"));
237 mips64_supply_fpregset (regcache,
238 (const mips64_elf_fpregset_t *) &fp_regs);
242 /* Store REGNO (or all registers if REGNO == -1) to the target
243 using PTRACE_SETREGS et al. */
246 mips64_linux_regsets_store_registers (const struct regcache *regcache, int regno)
251 if (regno >= mips_regnum (current_gdbarch)->fp0
252 && regno <= mips_regnum (current_gdbarch)->fp0 + 32)
254 else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
256 else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
261 tid = ptid_get_lwp (inferior_ptid);
263 tid = ptid_get_pid (inferior_ptid);
265 if (regno == -1 || !is_fp)
267 mips64_elf_gregset_t regs;
269 if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
270 perror_with_name (_("Couldn't get registers"));
272 mips64_fill_gregset (regcache, ®s, regno);
274 if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
275 perror_with_name (_("Couldn't set registers"));
278 if (regno == -1 || is_fp)
280 mips64_elf_fpregset_t fp_regs;
282 if (ptrace (PTRACE_GETFPREGS, tid, 0L,
283 (PTRACE_TYPE_ARG3) &fp_regs) == -1)
284 perror_with_name (_("Couldn't get FP registers"));
286 mips64_fill_fpregset (regcache, &fp_regs, regno);
288 if (ptrace (PTRACE_SETFPREGS, tid, 0L,
289 (PTRACE_TYPE_ARG3) &fp_regs) == -1)
290 perror_with_name (_("Couldn't set FP registers"));
294 /* Fetch REGNO (or all registers if REGNO == -1) from the target
295 using any working method. */
298 mips64_linux_fetch_registers (struct regcache *regcache, int regnum)
300 /* Unless we already know that PTRACE_GETREGS does not work, try it. */
301 if (have_ptrace_regsets)
302 mips64_linux_regsets_fetch_registers (regcache, regnum);
304 /* If we know, or just found out, that PTRACE_GETREGS does not work, fall
305 back to PTRACE_PEEKUSER. */
306 if (!have_ptrace_regsets)
307 super_fetch_registers (regcache, regnum);
310 /* Store REGNO (or all registers if REGNO == -1) to the target
311 using any working method. */
314 mips64_linux_store_registers (struct regcache *regcache, int regnum)
316 /* Unless we already know that PTRACE_GETREGS does not work, try it. */
317 if (have_ptrace_regsets)
318 mips64_linux_regsets_store_registers (regcache, regnum);
320 /* If we know, or just found out, that PTRACE_GETREGS does not work, fall
321 back to PTRACE_PEEKUSER. */
322 if (!have_ptrace_regsets)
323 super_store_registers (regcache, regnum);
326 /* Return the address in the core dump or inferior of register
330 mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
332 if (mips_abi_regsize (gdbarch) == 8)
333 return mips64_linux_register_addr (gdbarch, regno, store_p);
335 return mips_linux_register_addr (gdbarch, regno, store_p);
338 void _initialize_mips_linux_nat (void);
341 _initialize_mips_linux_nat (void)
343 struct target_ops *t = linux_trad_target (mips_linux_register_u_offset);
345 super_fetch_registers = t->to_fetch_registers;
346 super_store_registers = t->to_store_registers;
348 t->to_fetch_registers = mips64_linux_fetch_registers;
349 t->to_store_registers = mips64_linux_store_registers;
351 linux_nat_add_target (t);