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 3 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, see <http://www.gnu.org/licenses/>. */
23 #include "mips-tdep.h"
26 #include "linux-nat.h"
27 #include "mips-linux-tdep.h"
28 #include "target-descriptions.h"
29 #include "xml-support.h"
31 #include "gdb_proc_service.h"
35 #include <sys/ptrace.h>
37 #ifndef PTRACE_GET_THREAD_AREA
38 #define PTRACE_GET_THREAD_AREA 25
41 /* Assume that we have PTRACE_GETREGS et al. support. If we do not,
42 we'll clear this and use PTRACE_PEEKUSER instead. */
43 static int have_ptrace_regsets = 1;
45 /* Saved function pointers to fetch and store a single register using
46 PTRACE_PEEKUSER and PTRACE_POKEUSER. */
48 void (*super_fetch_registers) (struct regcache *, int);
49 void (*super_store_registers) (struct regcache *, int);
51 /* Map gdb internal register number to ptrace ``address''.
52 These ``addresses'' are normally defined in <asm/ptrace.h>.
54 ptrace does not provide a way to read (or set) MIPS_PS_REGNUM,
55 and there's no point in reading or setting MIPS_ZERO_REGNUM.
56 We also can not set BADVADDR, CAUSE, or FCRIR via ptrace(). */
59 mips_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
63 if (regno < 0 || regno >= gdbarch_num_regs (current_gdbarch))
64 error (_("Bogon register number %d."), regno);
66 if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
68 else if ((regno >= mips_regnum (gdbarch)->fp0)
69 && (regno < mips_regnum (gdbarch)->fp0 + 32))
70 regaddr = FPR_BASE + (regno - mips_regnum (gdbarch)->fp0);
71 else if (regno == mips_regnum (gdbarch)->pc)
73 else if (regno == mips_regnum (gdbarch)->cause)
74 regaddr = store? (CORE_ADDR) -1 : CAUSE;
75 else if (regno == mips_regnum (gdbarch)->badvaddr)
76 regaddr = store? (CORE_ADDR) -1 : BADVADDR;
77 else if (regno == mips_regnum (gdbarch)->lo)
79 else if (regno == mips_regnum (gdbarch)->hi)
81 else if (regno == mips_regnum (gdbarch)->fp_control_status)
83 else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
84 regaddr = store? (CORE_ADDR) -1 : FPC_EIR;
85 else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM)
88 regaddr = (CORE_ADDR) -1;
94 mips64_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)
98 if (regno < 0 || regno >= gdbarch_num_regs (current_gdbarch))
99 error (_("Bogon register number %d."), regno);
101 if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)
103 else if ((regno >= mips_regnum (gdbarch)->fp0)
104 && (regno < mips_regnum (gdbarch)->fp0 + 32))
105 regaddr = MIPS64_FPR_BASE + (regno - gdbarch_fp0_regnum (current_gdbarch));
106 else if (regno == mips_regnum (gdbarch)->pc)
108 else if (regno == mips_regnum (gdbarch)->cause)
109 regaddr = store? (CORE_ADDR) -1 : MIPS64_CAUSE;
110 else if (regno == mips_regnum (gdbarch)->badvaddr)
111 regaddr = store? (CORE_ADDR) -1 : MIPS64_BADVADDR;
112 else if (regno == mips_regnum (gdbarch)->lo)
113 regaddr = MIPS64_MMLO;
114 else if (regno == mips_regnum (gdbarch)->hi)
115 regaddr = MIPS64_MMHI;
116 else if (regno == mips_regnum (gdbarch)->fp_control_status)
117 regaddr = MIPS64_FPC_CSR;
118 else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)
119 regaddr = store? (CORE_ADDR) -1 : MIPS64_FPC_EIR;
120 else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM)
123 regaddr = (CORE_ADDR) -1;
128 /* Fetch the thread-local storage pointer for libthread_db. */
131 ps_get_thread_area (const struct ps_prochandle *ph,
132 lwpid_t lwpid, int idx, void **base)
134 if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
137 /* IDX is the bias from the thread pointer to the beginning of the
138 thread descriptor. It has to be subtracted due to implementation
139 quirks in libthread_db. */
140 *base = (void *) ((char *)*base - idx);
145 /* Wrapper functions. These are only used by libthread_db. */
148 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
150 if (mips_isa_regsize (current_gdbarch) == 4)
151 mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp);
153 mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp);
157 fill_gregset (const struct regcache *regcache,
158 gdb_gregset_t *gregsetp, int regno)
160 if (mips_isa_regsize (current_gdbarch) == 4)
161 mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno);
163 mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno);
167 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
169 if (mips_isa_regsize (current_gdbarch) == 4)
170 mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp);
172 mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp);
176 fill_fpregset (const struct regcache *regcache,
177 gdb_fpregset_t *fpregsetp, int regno)
179 if (mips_isa_regsize (current_gdbarch) == 4)
180 mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno);
182 mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno);
186 /* Fetch REGNO (or all registers if REGNO == -1) from the target
187 using PTRACE_GETREGS et al. */
190 mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno)
195 if (regno >= mips_regnum (current_gdbarch)->fp0
196 && regno <= mips_regnum (current_gdbarch)->fp0 + 32)
198 else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
200 else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
205 tid = ptid_get_lwp (inferior_ptid);
207 tid = ptid_get_pid (inferior_ptid);
209 if (regno == -1 || !is_fp)
211 mips64_elf_gregset_t regs;
213 if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
217 have_ptrace_regsets = 0;
220 perror_with_name (_("Couldn't get registers"));
223 mips64_supply_gregset (regcache,
224 (const mips64_elf_gregset_t *) ®s);
227 if (regno == -1 || is_fp)
229 mips64_elf_fpregset_t fp_regs;
231 if (ptrace (PTRACE_GETFPREGS, tid, 0L,
232 (PTRACE_TYPE_ARG3) &fp_regs) == -1)
236 have_ptrace_regsets = 0;
239 perror_with_name (_("Couldn't get FP registers"));
242 mips64_supply_fpregset (regcache,
243 (const mips64_elf_fpregset_t *) &fp_regs);
247 /* Store REGNO (or all registers if REGNO == -1) to the target
248 using PTRACE_SETREGS et al. */
251 mips64_linux_regsets_store_registers (const struct regcache *regcache, int regno)
256 if (regno >= mips_regnum (current_gdbarch)->fp0
257 && regno <= mips_regnum (current_gdbarch)->fp0 + 32)
259 else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
261 else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
266 tid = ptid_get_lwp (inferior_ptid);
268 tid = ptid_get_pid (inferior_ptid);
270 if (regno == -1 || !is_fp)
272 mips64_elf_gregset_t regs;
274 if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
275 perror_with_name (_("Couldn't get registers"));
277 mips64_fill_gregset (regcache, ®s, regno);
279 if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
280 perror_with_name (_("Couldn't set registers"));
283 if (regno == -1 || is_fp)
285 mips64_elf_fpregset_t fp_regs;
287 if (ptrace (PTRACE_GETFPREGS, tid, 0L,
288 (PTRACE_TYPE_ARG3) &fp_regs) == -1)
289 perror_with_name (_("Couldn't get FP registers"));
291 mips64_fill_fpregset (regcache, &fp_regs, regno);
293 if (ptrace (PTRACE_SETFPREGS, tid, 0L,
294 (PTRACE_TYPE_ARG3) &fp_regs) == -1)
295 perror_with_name (_("Couldn't set FP registers"));
299 /* Fetch REGNO (or all registers if REGNO == -1) from the target
300 using any working method. */
303 mips64_linux_fetch_registers (struct regcache *regcache, int regnum)
305 /* Unless we already know that PTRACE_GETREGS does not work, try it. */
306 if (have_ptrace_regsets)
307 mips64_linux_regsets_fetch_registers (regcache, regnum);
309 /* If we know, or just found out, that PTRACE_GETREGS does not work, fall
310 back to PTRACE_PEEKUSER. */
311 if (!have_ptrace_regsets)
312 super_fetch_registers (regcache, regnum);
315 /* Store REGNO (or all registers if REGNO == -1) to the target
316 using any working method. */
319 mips64_linux_store_registers (struct regcache *regcache, int regnum)
321 /* Unless we already know that PTRACE_GETREGS does not work, try it. */
322 if (have_ptrace_regsets)
323 mips64_linux_regsets_store_registers (regcache, regnum);
325 /* If we know, or just found out, that PTRACE_GETREGS does not work, fall
326 back to PTRACE_PEEKUSER. */
327 if (!have_ptrace_regsets)
328 super_store_registers (regcache, regnum);
331 /* Return the address in the core dump or inferior of register
335 mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
337 if (mips_abi_regsize (gdbarch) == 8)
338 return mips64_linux_register_addr (gdbarch, regno, store_p);
340 return mips_linux_register_addr (gdbarch, regno, store_p);
343 static LONGEST (*super_xfer_partial) (struct target_ops *, enum target_object,
344 const char *, gdb_byte *, const gdb_byte *,
348 mips_linux_xfer_partial (struct target_ops *ops,
349 enum target_object object,
351 gdb_byte *readbuf, const gdb_byte *writebuf,
352 ULONGEST offset, LONGEST len)
354 if (object == TARGET_OBJECT_AVAILABLE_FEATURES)
356 if (annex != NULL && strcmp (annex, "target.xml") == 0)
358 /* Report that target registers are a size we know for sure
359 that we can get from ptrace. */
360 if (_MIPS_SIM == _ABIO32)
361 annex = "mips-linux.xml";
363 annex = "mips64-linux.xml";
366 return xml_builtin_xfer_partial (annex, readbuf, writebuf, offset, len);
369 return super_xfer_partial (ops, object, annex, readbuf, writebuf,
373 void _initialize_mips_linux_nat (void);
376 _initialize_mips_linux_nat (void)
378 struct target_ops *t = linux_trad_target (mips_linux_register_u_offset);
380 super_fetch_registers = t->to_fetch_registers;
381 super_store_registers = t->to_store_registers;
383 t->to_fetch_registers = mips64_linux_fetch_registers;
384 t->to_store_registers = mips64_linux_store_registers;
386 /* Override the default to_xfer_partial. */
387 super_xfer_partial = t->to_xfer_partial;
388 t->to_xfer_partial = mips_linux_xfer_partial;
390 linux_nat_add_target (t);