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
);