1 /* Target-dependent code for GNU/Linux on MIPS processors.
3 Copyright 2001, 2002, 2004 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., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
25 #include "solib-svr4.h"
27 #include "mips-tdep.h"
28 #include "gdb_string.h"
29 #include "gdb_assert.h"
31 #include "trad-frame.h"
32 #include "tramp-frame.h"
34 /* Copied from <asm/elf.h>. */
38 typedef unsigned char elf_greg_t
[4];
39 typedef elf_greg_t elf_gregset_t
[ELF_NGREG
];
41 typedef unsigned char elf_fpreg_t
[8];
42 typedef elf_fpreg_t elf_fpregset_t
[ELF_NFPREG
];
44 /* 0 - 31 are integer registers, 32 - 63 are fp registers. */
59 #define EF_CP0_BADVADDR 41
60 #define EF_CP0_STATUS 42
61 #define EF_CP0_CAUSE 43
65 /* Figure out where the longjmp will land.
66 We expect the first arg to be a pointer to the jmp_buf structure from
67 which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
68 is copied into PC. This routine returns 1 on success. */
70 #define MIPS_LINUX_JB_ELEMENT_SIZE 4
71 #define MIPS_LINUX_JB_PC 0
74 mips_linux_get_longjmp_target (CORE_ADDR
*pc
)
77 char buf
[TARGET_PTR_BIT
/ TARGET_CHAR_BIT
];
79 jb_addr
= read_register (A0_REGNUM
);
81 if (target_read_memory (jb_addr
82 + MIPS_LINUX_JB_PC
* MIPS_LINUX_JB_ELEMENT_SIZE
,
83 buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
86 *pc
= extract_unsigned_integer (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
91 /* Transform the bits comprising a 32-bit register to the right size
92 for regcache_raw_supply(). This is needed when mips_isa_regsize()
96 supply_32bit_reg (int regnum
, const void *addr
)
98 char buf
[MAX_REGISTER_SIZE
];
99 store_signed_integer (buf
, register_size (current_gdbarch
, regnum
),
100 extract_signed_integer (addr
, 4));
101 regcache_raw_supply (current_regcache
, regnum
, buf
);
104 /* Unpack an elf_gregset_t into GDB's register cache. */
107 supply_gregset (elf_gregset_t
*gregsetp
)
110 elf_greg_t
*regp
= *gregsetp
;
111 char zerobuf
[MAX_REGISTER_SIZE
];
113 memset (zerobuf
, 0, MAX_REGISTER_SIZE
);
115 for (regi
= EF_REG0
; regi
<= EF_REG31
; regi
++)
116 supply_32bit_reg ((regi
- EF_REG0
), (char *)(regp
+ regi
));
118 supply_32bit_reg (mips_regnum (current_gdbarch
)->lo
,
119 (char *)(regp
+ EF_LO
));
120 supply_32bit_reg (mips_regnum (current_gdbarch
)->hi
,
121 (char *)(regp
+ EF_HI
));
123 supply_32bit_reg (mips_regnum (current_gdbarch
)->pc
,
124 (char *)(regp
+ EF_CP0_EPC
));
125 supply_32bit_reg (mips_regnum (current_gdbarch
)->badvaddr
,
126 (char *)(regp
+ EF_CP0_BADVADDR
));
127 supply_32bit_reg (PS_REGNUM
, (char *)(regp
+ EF_CP0_STATUS
));
128 supply_32bit_reg (mips_regnum (current_gdbarch
)->cause
,
129 (char *)(regp
+ EF_CP0_CAUSE
));
131 /* Fill inaccessible registers with zero. */
132 regcache_raw_supply (current_regcache
, UNUSED_REGNUM
, zerobuf
);
133 for (regi
= FIRST_EMBED_REGNUM
; regi
< LAST_EMBED_REGNUM
; regi
++)
134 regcache_raw_supply (current_regcache
, regi
, zerobuf
);
137 /* Pack our registers (or one register) into an elf_gregset_t. */
140 fill_gregset (elf_gregset_t
*gregsetp
, int regno
)
143 elf_greg_t
*regp
= *gregsetp
;
148 memset (regp
, 0, sizeof (elf_gregset_t
));
149 for (regi
= 0; regi
< 32; regi
++)
150 fill_gregset (gregsetp
, regi
);
151 fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->lo
);
152 fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->hi
);
153 fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->pc
);
154 fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->badvaddr
);
155 fill_gregset (gregsetp
, PS_REGNUM
);
156 fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->cause
);
163 dst
= regp
+ regno
+ EF_REG0
;
164 regcache_raw_collect (current_regcache
, regno
, dst
);
168 if (regno
== mips_regnum (current_gdbarch
)->lo
)
170 else if (regno
== mips_regnum (current_gdbarch
)->hi
)
172 else if (regno
== mips_regnum (current_gdbarch
)->pc
)
173 regaddr
= EF_CP0_EPC
;
174 else if (regno
== mips_regnum (current_gdbarch
)->badvaddr
)
175 regaddr
= EF_CP0_BADVADDR
;
176 else if (regno
== PS_REGNUM
)
177 regaddr
= EF_CP0_STATUS
;
178 else if (regno
== mips_regnum (current_gdbarch
)->cause
)
179 regaddr
= EF_CP0_CAUSE
;
185 dst
= regp
+ regaddr
;
186 regcache_raw_collect (current_regcache
, regno
, dst
);
190 /* Likewise, unpack an elf_fpregset_t. */
193 supply_fpregset (elf_fpregset_t
*fpregsetp
)
196 char zerobuf
[MAX_REGISTER_SIZE
];
198 memset (zerobuf
, 0, MAX_REGISTER_SIZE
);
200 for (regi
= 0; regi
< 32; regi
++)
201 regcache_raw_supply (current_regcache
, FP0_REGNUM
+ regi
,
202 (char *)(*fpregsetp
+ regi
));
204 regcache_raw_supply (current_regcache
,
205 mips_regnum (current_gdbarch
)->fp_control_status
,
206 (char *)(*fpregsetp
+ 32));
208 /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */
209 regcache_raw_supply (current_regcache
,
210 mips_regnum (current_gdbarch
)->fp_implementation_revision
,
214 /* Likewise, pack one or all floating point registers into an
218 fill_fpregset (elf_fpregset_t
*fpregsetp
, int regno
)
222 if ((regno
>= FP0_REGNUM
) && (regno
< FP0_REGNUM
+ 32))
224 from
= (char *) &deprecated_registers
[DEPRECATED_REGISTER_BYTE (regno
)];
225 to
= (char *) (*fpregsetp
+ regno
- FP0_REGNUM
);
226 memcpy (to
, from
, register_size (current_gdbarch
, regno
- FP0_REGNUM
));
228 else if (regno
== mips_regnum (current_gdbarch
)->fp_control_status
)
230 from
= (char *) &deprecated_registers
[DEPRECATED_REGISTER_BYTE (regno
)];
231 to
= (char *) (*fpregsetp
+ 32);
232 memcpy (to
, from
, register_size (current_gdbarch
, regno
));
234 else if (regno
== -1)
238 for (regi
= 0; regi
< 32; regi
++)
239 fill_fpregset (fpregsetp
, FP0_REGNUM
+ regi
);
240 fill_fpregset(fpregsetp
, mips_regnum (current_gdbarch
)->fp_control_status
);
244 /* Map gdb internal register number to ptrace ``address''.
245 These ``addresses'' are normally defined in <asm/ptrace.h>. */
248 mips_linux_register_addr (int regno
, CORE_ADDR blockend
)
252 if (regno
< 0 || regno
>= NUM_REGS
)
253 error ("Bogon register number %d.", regno
);
257 else if ((regno
>= mips_regnum (current_gdbarch
)->fp0
)
258 && (regno
< mips_regnum (current_gdbarch
)->fp0
+ 32))
259 regaddr
= FPR_BASE
+ (regno
- mips_regnum (current_gdbarch
)->fp0
);
260 else if (regno
== mips_regnum (current_gdbarch
)->pc
)
262 else if (regno
== mips_regnum (current_gdbarch
)->cause
)
264 else if (regno
== mips_regnum (current_gdbarch
)->badvaddr
)
266 else if (regno
== mips_regnum (current_gdbarch
)->lo
)
268 else if (regno
== mips_regnum (current_gdbarch
)->hi
)
270 else if (regno
== mips_regnum (current_gdbarch
)->fp_control_status
)
272 else if (regno
== mips_regnum (current_gdbarch
)->fp_implementation_revision
)
275 error ("Unknowable register number %d.", regno
);
281 /* Fetch (and possibly build) an appropriate link_map_offsets
282 structure for native GNU/Linux MIPS targets using the struct offsets
283 defined in link.h (but without actual reference to that file).
285 This makes it possible to access GNU/Linux MIPS shared libraries from a
286 GDB that was built on a different host platform (for cross debugging). */
288 static struct link_map_offsets
*
289 mips_linux_svr4_fetch_link_map_offsets (void)
291 static struct link_map_offsets lmo
;
292 static struct link_map_offsets
*lmp
= NULL
;
298 lmo
.r_debug_size
= 8; /* The actual size is 20 bytes, but
299 this is all we need. */
300 lmo
.r_map_offset
= 4;
303 lmo
.link_map_size
= 20;
305 lmo
.l_addr_offset
= 0;
308 lmo
.l_name_offset
= 4;
311 lmo
.l_next_offset
= 12;
314 lmo
.l_prev_offset
= 16;
321 /* Support for 64-bit ABIs. */
323 /* Copied from <asm/elf.h>. */
324 #define MIPS64_ELF_NGREG 45
325 #define MIPS64_ELF_NFPREG 33
327 typedef unsigned char mips64_elf_greg_t
[8];
328 typedef mips64_elf_greg_t mips64_elf_gregset_t
[MIPS64_ELF_NGREG
];
330 typedef unsigned char mips64_elf_fpreg_t
[8];
331 typedef mips64_elf_fpreg_t mips64_elf_fpregset_t
[MIPS64_ELF_NFPREG
];
333 /* 0 - 31 are integer registers, 32 - 63 are fp registers. */
334 #define MIPS64_FPR_BASE 32
336 #define MIPS64_CAUSE 65
337 #define MIPS64_BADVADDR 66
338 #define MIPS64_MMHI 67
339 #define MIPS64_MMLO 68
340 #define MIPS64_FPC_CSR 69
341 #define MIPS64_FPC_EIR 70
343 #define MIPS64_EF_REG0 0
344 #define MIPS64_EF_REG31 31
345 #define MIPS64_EF_LO 32
346 #define MIPS64_EF_HI 33
347 #define MIPS64_EF_CP0_EPC 34
348 #define MIPS64_EF_CP0_BADVADDR 35
349 #define MIPS64_EF_CP0_STATUS 36
350 #define MIPS64_EF_CP0_CAUSE 37
352 #define MIPS64_EF_SIZE 304
354 /* Figure out where the longjmp will land.
355 We expect the first arg to be a pointer to the jmp_buf structure from
356 which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
357 is copied into PC. This routine returns 1 on success. */
359 /* Details about jmp_buf. */
361 #define MIPS64_LINUX_JB_PC 0
364 mips64_linux_get_longjmp_target (CORE_ADDR
*pc
)
367 void *buf
= alloca (TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
368 int element_size
= TARGET_PTR_BIT
== 32 ? 4 : 8;
370 jb_addr
= read_register (A0_REGNUM
);
372 if (target_read_memory (jb_addr
+ MIPS64_LINUX_JB_PC
* element_size
,
373 buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
376 *pc
= extract_unsigned_integer (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
381 /* Unpack an elf_gregset_t into GDB's register cache. */
384 mips64_supply_gregset (mips64_elf_gregset_t
*gregsetp
)
387 mips64_elf_greg_t
*regp
= *gregsetp
;
388 char zerobuf
[MAX_REGISTER_SIZE
];
390 memset (zerobuf
, 0, MAX_REGISTER_SIZE
);
392 for (regi
= MIPS64_EF_REG0
; regi
<= MIPS64_EF_REG31
; regi
++)
393 regcache_raw_supply (current_regcache
, (regi
- MIPS64_EF_REG0
),
394 (char *)(regp
+ regi
));
396 regcache_raw_supply (current_regcache
, mips_regnum (current_gdbarch
)->lo
,
397 (char *)(regp
+ MIPS64_EF_LO
));
398 regcache_raw_supply (current_regcache
, mips_regnum (current_gdbarch
)->hi
,
399 (char *)(regp
+ MIPS64_EF_HI
));
401 regcache_raw_supply (current_regcache
, mips_regnum (current_gdbarch
)->pc
,
402 (char *)(regp
+ MIPS64_EF_CP0_EPC
));
403 regcache_raw_supply (current_regcache
, mips_regnum (current_gdbarch
)->badvaddr
,
404 (char *)(regp
+ MIPS64_EF_CP0_BADVADDR
));
405 regcache_raw_supply (current_regcache
, PS_REGNUM
,
406 (char *)(regp
+ MIPS64_EF_CP0_STATUS
));
407 regcache_raw_supply (current_regcache
, mips_regnum (current_gdbarch
)->cause
,
408 (char *)(regp
+ MIPS64_EF_CP0_CAUSE
));
410 /* Fill inaccessible registers with zero. */
411 regcache_raw_supply (current_regcache
, UNUSED_REGNUM
, zerobuf
);
412 for (regi
= FIRST_EMBED_REGNUM
; regi
< LAST_EMBED_REGNUM
; regi
++)
413 regcache_raw_supply (current_regcache
, regi
, zerobuf
);
416 /* Pack our registers (or one register) into an elf_gregset_t. */
419 mips64_fill_gregset (mips64_elf_gregset_t
*gregsetp
, int regno
)
422 mips64_elf_greg_t
*regp
= *gregsetp
;
427 memset (regp
, 0, sizeof (mips64_elf_gregset_t
));
428 for (regi
= 0; regi
< 32; regi
++)
429 mips64_fill_gregset (gregsetp
, regi
);
430 mips64_fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->lo
);
431 mips64_fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->hi
);
432 mips64_fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->pc
);
433 mips64_fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->badvaddr
);
434 mips64_fill_gregset (gregsetp
, PS_REGNUM
);
435 mips64_fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->cause
);
442 dst
= regp
+ regno
+ MIPS64_EF_REG0
;
443 regcache_raw_collect (current_regcache
, regno
, dst
);
447 if (regno
== mips_regnum (current_gdbarch
)->lo
)
448 regaddr
= MIPS64_EF_LO
;
449 else if (regno
== mips_regnum (current_gdbarch
)->hi
)
450 regaddr
= MIPS64_EF_HI
;
451 else if (regno
== mips_regnum (current_gdbarch
)->pc
)
452 regaddr
= MIPS64_EF_CP0_EPC
;
453 else if (regno
== mips_regnum (current_gdbarch
)->badvaddr
)
454 regaddr
= MIPS64_EF_CP0_BADVADDR
;
455 else if (regno
== PS_REGNUM
)
456 regaddr
= MIPS64_EF_CP0_STATUS
;
457 else if (regno
== mips_regnum (current_gdbarch
)->cause
)
458 regaddr
= MIPS64_EF_CP0_CAUSE
;
464 dst
= regp
+ regaddr
;
465 regcache_raw_collect (current_regcache
, regno
, dst
);
469 /* Likewise, unpack an elf_fpregset_t. */
472 mips64_supply_fpregset (mips64_elf_fpregset_t
*fpregsetp
)
475 char zerobuf
[MAX_REGISTER_SIZE
];
477 memset (zerobuf
, 0, MAX_REGISTER_SIZE
);
479 for (regi
= 0; regi
< 32; regi
++)
480 regcache_raw_supply (current_regcache
, FP0_REGNUM
+ regi
,
481 (char *)(*fpregsetp
+ regi
));
483 regcache_raw_supply (current_regcache
,
484 mips_regnum (current_gdbarch
)->fp_control_status
,
485 (char *)(*fpregsetp
+ 32));
487 /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */
488 regcache_raw_supply (current_regcache
,
489 mips_regnum (current_gdbarch
)->fp_implementation_revision
,
493 /* Likewise, pack one or all floating point registers into an
497 mips64_fill_fpregset (mips64_elf_fpregset_t
*fpregsetp
, int regno
)
501 if ((regno
>= FP0_REGNUM
) && (regno
< FP0_REGNUM
+ 32))
503 from
= (char *) &deprecated_registers
[DEPRECATED_REGISTER_BYTE (regno
)];
504 to
= (char *) (*fpregsetp
+ regno
- FP0_REGNUM
);
505 memcpy (to
, from
, register_size (current_gdbarch
, regno
- FP0_REGNUM
));
507 else if (regno
== mips_regnum (current_gdbarch
)->fp_control_status
)
509 from
= (char *) &deprecated_registers
[DEPRECATED_REGISTER_BYTE (regno
)];
510 to
= (char *) (*fpregsetp
+ 32);
511 memcpy (to
, from
, register_size (current_gdbarch
, regno
));
513 else if (regno
== -1)
517 for (regi
= 0; regi
< 32; regi
++)
518 mips64_fill_fpregset (fpregsetp
, FP0_REGNUM
+ regi
);
519 mips64_fill_fpregset(fpregsetp
,
520 mips_regnum (current_gdbarch
)->fp_control_status
);
525 /* Map gdb internal register number to ptrace ``address''.
526 These ``addresses'' are normally defined in <asm/ptrace.h>. */
529 mips64_linux_register_addr (int regno
, CORE_ADDR blockend
)
533 if (regno
< 0 || regno
>= NUM_REGS
)
534 error ("Bogon register number %d.", regno
);
538 else if ((regno
>= mips_regnum (current_gdbarch
)->fp0
)
539 && (regno
< mips_regnum (current_gdbarch
)->fp0
+ 32))
540 regaddr
= MIPS64_FPR_BASE
+ (regno
- FP0_REGNUM
);
541 else if (regno
== mips_regnum (current_gdbarch
)->pc
)
543 else if (regno
== mips_regnum (current_gdbarch
)->cause
)
544 regaddr
= MIPS64_CAUSE
;
545 else if (regno
== mips_regnum (current_gdbarch
)->badvaddr
)
546 regaddr
= MIPS64_BADVADDR
;
547 else if (regno
== mips_regnum (current_gdbarch
)->lo
)
548 regaddr
= MIPS64_MMLO
;
549 else if (regno
== mips_regnum (current_gdbarch
)->hi
)
550 regaddr
= MIPS64_MMHI
;
551 else if (regno
== mips_regnum (current_gdbarch
)->fp_control_status
)
552 regaddr
= MIPS64_FPC_CSR
;
553 else if (regno
== mips_regnum (current_gdbarch
)->fp_implementation_revision
)
554 regaddr
= MIPS64_FPC_EIR
;
556 error ("Unknowable register number %d.", regno
);
561 /* Use a local version of this function to get the correct types for
562 regsets, until multi-arch core support is ready. */
565 fetch_core_registers (char *core_reg_sect
, unsigned core_reg_size
,
566 int which
, CORE_ADDR reg_addr
)
568 elf_gregset_t gregset
;
569 elf_fpregset_t fpregset
;
570 mips64_elf_gregset_t gregset64
;
571 mips64_elf_fpregset_t fpregset64
;
575 if (core_reg_size
== sizeof (gregset
))
577 memcpy ((char *) &gregset
, core_reg_sect
, sizeof (gregset
));
578 supply_gregset (&gregset
);
580 else if (core_reg_size
== sizeof (gregset64
))
582 memcpy ((char *) &gregset64
, core_reg_sect
, sizeof (gregset64
));
583 mips64_supply_gregset (&gregset64
);
587 warning ("wrong size gregset struct in core file");
592 if (core_reg_size
== sizeof (fpregset
))
594 memcpy ((char *) &fpregset
, core_reg_sect
, sizeof (fpregset
));
595 supply_fpregset (&fpregset
);
597 else if (core_reg_size
== sizeof (fpregset64
))
599 memcpy ((char *) &fpregset64
, core_reg_sect
, sizeof (fpregset64
));
600 mips64_supply_fpregset (&fpregset64
);
604 warning ("wrong size fpregset struct in core file");
609 /* Register that we are able to handle ELF file formats using standard
610 procfs "regset" structures. */
612 static struct core_fns regset_core_fns
=
614 bfd_target_elf_flavour
, /* core_flavour */
615 default_check_format
, /* check_format */
616 default_core_sniffer
, /* core_sniffer */
617 fetch_core_registers
, /* core_read_registers */
621 /* Fetch (and possibly build) an appropriate link_map_offsets
622 structure for native GNU/Linux MIPS targets using the struct offsets
623 defined in link.h (but without actual reference to that file).
625 This makes it possible to access GNU/Linux MIPS shared libraries from a
626 GDB that was built on a different host platform (for cross debugging). */
628 static struct link_map_offsets
*
629 mips64_linux_svr4_fetch_link_map_offsets (void)
631 static struct link_map_offsets lmo
;
632 static struct link_map_offsets
*lmp
= NULL
;
638 lmo
.r_debug_size
= 16; /* The actual size is 40 bytes, but
639 this is all we need. */
640 lmo
.r_map_offset
= 8;
643 lmo
.link_map_size
= 40;
645 lmo
.l_addr_offset
= 0;
648 lmo
.l_name_offset
= 8;
651 lmo
.l_next_offset
= 24;
654 lmo
.l_prev_offset
= 32;
661 /* Handle for obtaining pointer to the current register_addr() function
662 for a given architecture. */
663 static struct gdbarch_data
*register_addr_data
;
666 register_addr (int regno
, CORE_ADDR blockend
)
668 CORE_ADDR (*register_addr_ptr
) (int, CORE_ADDR
) =
669 gdbarch_data (current_gdbarch
, register_addr_data
);
671 gdb_assert (register_addr_ptr
!= 0);
673 return register_addr_ptr (regno
, blockend
);
677 set_mips_linux_register_addr (struct gdbarch
*gdbarch
,
678 CORE_ADDR (*register_addr_ptr
) (int, CORE_ADDR
))
680 deprecated_set_gdbarch_data (gdbarch
, register_addr_data
, register_addr_ptr
);
684 init_register_addr_data (struct gdbarch
*gdbarch
)
689 /* Check the code at PC for a dynamic linker lazy resolution stub. Because
690 they aren't in the .plt section, we pattern-match on the code generated
691 by GNU ld. They look like this:
698 (with the appropriate doubleword instructions for N64). Also return the
699 dynamic symbol index used in the last instruction. */
702 mips_linux_in_dynsym_stub (CORE_ADDR pc
, char *name
)
704 unsigned char buf
[28], *p
;
705 ULONGEST insn
, insn1
;
706 int n64
= (mips_abi (current_gdbarch
) == MIPS_ABI_N64
);
708 read_memory (pc
- 12, buf
, 28);
712 /* ld t9,0x8010(gp) */
717 /* lw t9,0x8010(gp) */
724 insn
= extract_unsigned_integer (p
, 4);
732 insn
= extract_unsigned_integer (p
+ 4, 4);
736 if (insn
!= 0x03e0782d)
742 if (insn
!= 0x03e07821)
746 insn
= extract_unsigned_integer (p
+ 8, 4);
748 if (insn
!= 0x0320f809)
751 insn
= extract_unsigned_integer (p
+ 12, 4);
754 /* daddiu t8,zero,0 */
755 if ((insn
& 0xffff0000) != 0x64180000)
760 /* addiu t8,zero,0 */
761 if ((insn
& 0xffff0000) != 0x24180000)
765 return (insn
& 0xffff);
768 /* Return non-zero iff PC belongs to the dynamic linker resolution code
772 mips_linux_in_dynsym_resolve_code (CORE_ADDR pc
)
774 /* Check whether PC is in the dynamic linker. This also checks whether
775 it is in the .plt section, which MIPS does not use. */
776 if (in_solib_dynsym_resolve_code (pc
))
779 /* Pattern match for the stub. It would be nice if there were a more
780 efficient way to avoid this check. */
781 if (mips_linux_in_dynsym_stub (pc
, NULL
))
787 /* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c,
788 and glibc_skip_solib_resolver in glibc-tdep.c. The normal glibc
789 implementation of this triggers at "fixup" from the same objfile as
790 "_dl_runtime_resolve"; MIPS GNU/Linux can trigger at
791 "__dl_runtime_resolve" directly. An unresolved PLT entry will
792 point to _dl_runtime_resolve, which will first call
793 __dl_runtime_resolve, and then pass control to the resolved
797 mips_linux_skip_resolver (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
799 struct minimal_symbol
*resolver
;
801 resolver
= lookup_minimal_symbol ("__dl_runtime_resolve", NULL
, NULL
);
803 if (resolver
&& SYMBOL_VALUE_ADDRESS (resolver
) == pc
)
804 return frame_pc_unwind (get_current_frame ());
809 /* Signal trampoline support. There are four supported layouts for a
810 signal frame: o32 sigframe, o32 rt_sigframe, n32 rt_sigframe, and
811 n64 rt_sigframe. We handle them all independently; not the most
812 efficient way, but simplest. First, declare all the unwinders. */
814 static void mips_linux_o32_sigframe_init (const struct tramp_frame
*self
,
815 struct frame_info
*next_frame
,
816 struct trad_frame_cache
*this_cache
,
819 static void mips_linux_n32n64_sigframe_init (const struct tramp_frame
*self
,
820 struct frame_info
*next_frame
,
821 struct trad_frame_cache
*this_cache
,
824 #define MIPS_NR_LINUX 4000
825 #define MIPS_NR_N64_LINUX 5000
826 #define MIPS_NR_N32_LINUX 6000
828 #define MIPS_NR_sigreturn MIPS_NR_LINUX + 119
829 #define MIPS_NR_rt_sigreturn MIPS_NR_LINUX + 193
830 #define MIPS_NR_N64_rt_sigreturn MIPS_NR_N64_LINUX + 211
831 #define MIPS_NR_N32_rt_sigreturn MIPS_NR_N32_LINUX + 211
833 #define MIPS_INST_LI_V0_SIGRETURN 0x24020000 + MIPS_NR_sigreturn
834 #define MIPS_INST_LI_V0_RT_SIGRETURN 0x24020000 + MIPS_NR_rt_sigreturn
835 #define MIPS_INST_LI_V0_N64_RT_SIGRETURN 0x24020000 + MIPS_NR_N64_rt_sigreturn
836 #define MIPS_INST_LI_V0_N32_RT_SIGRETURN 0x24020000 + MIPS_NR_N32_rt_sigreturn
837 #define MIPS_INST_SYSCALL 0x0000000c
839 static const struct tramp_frame mips_linux_o32_sigframe
= {
843 { MIPS_INST_LI_V0_SIGRETURN
, -1 },
844 { MIPS_INST_SYSCALL
, -1 },
845 { TRAMP_SENTINEL_INSN
, -1 }
847 mips_linux_o32_sigframe_init
850 static const struct tramp_frame mips_linux_o32_rt_sigframe
= {
854 { MIPS_INST_LI_V0_RT_SIGRETURN
, -1 },
855 { MIPS_INST_SYSCALL
, -1 },
856 { TRAMP_SENTINEL_INSN
, -1 } },
857 mips_linux_o32_sigframe_init
860 static const struct tramp_frame mips_linux_n32_rt_sigframe
= {
864 { MIPS_INST_LI_V0_N32_RT_SIGRETURN
, -1 },
865 { MIPS_INST_SYSCALL
, -1 },
866 { TRAMP_SENTINEL_INSN
, -1 }
868 mips_linux_n32n64_sigframe_init
871 static const struct tramp_frame mips_linux_n64_rt_sigframe
= {
874 { MIPS_INST_LI_V0_N64_RT_SIGRETURN
, MIPS_INST_SYSCALL
, TRAMP_SENTINEL_INSN
},
875 mips_linux_n32n64_sigframe_init
879 /* The unwinder for o32 signal frames. The legacy structures look
883 u32 sf_ass[4]; [argument save space for o32]
884 u32 sf_code[2]; [signal trampoline]
885 struct sigcontext sf_sc;
890 unsigned int sc_regmask; [Unused]
891 unsigned int sc_status;
892 unsigned long long sc_pc;
893 unsigned long long sc_regs[32];
894 unsigned long long sc_fpregs[32];
895 unsigned int sc_ownedfp;
896 unsigned int sc_fpc_csr;
897 unsigned int sc_fpc_eir; [Unused]
898 unsigned int sc_used_math;
899 unsigned int sc_ssflags; [Unused]
900 [Alignment hole of four bytes]
901 unsigned long long sc_mdhi;
902 unsigned long long sc_mdlo;
904 unsigned int sc_cause; [Unused]
905 unsigned int sc_badvaddr; [Unused]
907 unsigned long sc_sigset[4]; [kernel's sigset_t]
910 The RT signal frames look like this:
913 u32 rs_ass[4]; [argument save space for o32]
914 u32 rs_code[2] [signal trampoline]
915 struct siginfo rs_info;
916 struct ucontext rs_uc;
920 unsigned long uc_flags;
921 struct ucontext *uc_link;
923 [Alignment hole of four bytes]
924 struct sigcontext uc_mcontext;
929 #define SIGFRAME_CODE_OFFSET (4 * 4)
930 #define SIGFRAME_SIGCONTEXT_OFFSET (6 * 4)
932 #define RTSIGFRAME_SIGINFO_SIZE 128
933 #define STACK_T_SIZE (3 * 4)
934 #define UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + STACK_T_SIZE + 4)
935 #define RTSIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \
936 + RTSIGFRAME_SIGINFO_SIZE \
937 + UCONTEXT_SIGCONTEXT_OFFSET)
939 #define SIGCONTEXT_PC (1 * 8)
940 #define SIGCONTEXT_REGS (2 * 8)
941 #define SIGCONTEXT_FPREGS (34 * 8)
942 #define SIGCONTEXT_FPCSR (66 * 8 + 4)
943 #define SIGCONTEXT_HI (69 * 8)
944 #define SIGCONTEXT_LO (70 * 8)
945 #define SIGCONTEXT_CAUSE (71 * 8 + 0)
946 #define SIGCONTEXT_BADVADDR (71 * 8 + 4)
948 #define SIGCONTEXT_REG_SIZE 8
951 mips_linux_o32_sigframe_init (const struct tramp_frame
*self
,
952 struct frame_info
*next_frame
,
953 struct trad_frame_cache
*this_cache
,
956 int ireg
, reg_position
;
957 CORE_ADDR sigcontext_base
= func
- SIGFRAME_CODE_OFFSET
;
958 const struct mips_regnum
*regs
= mips_regnum (current_gdbarch
);
960 if (self
== &mips_linux_o32_sigframe
)
961 sigcontext_base
+= SIGFRAME_SIGCONTEXT_OFFSET
;
963 sigcontext_base
+= RTSIGFRAME_SIGCONTEXT_OFFSET
;
965 /* I'm not proud of this hack. Eventually we will have the infrastructure
966 to indicate the size of saved registers on a per-frame basis, but
967 right now we don't; the kernel saves eight bytes but we only want
969 if (TARGET_BYTE_ORDER
== BFD_ENDIAN_BIG
)
970 sigcontext_base
+= 4;
973 trad_frame_set_reg_addr (this_cache
, ORIG_ZERO_REGNUM
+ NUM_REGS
,
974 sigcontext_base
+ SIGCONTEXT_REGS
);
977 for (ireg
= 1; ireg
< 32; ireg
++)
978 trad_frame_set_reg_addr (this_cache
, ireg
+ ZERO_REGNUM
+ NUM_REGS
,
979 sigcontext_base
+ SIGCONTEXT_REGS
980 + ireg
* SIGCONTEXT_REG_SIZE
);
982 for (ireg
= 0; ireg
< 32; ireg
++)
983 trad_frame_set_reg_addr (this_cache
, ireg
+ regs
->fp0
+ NUM_REGS
,
984 sigcontext_base
+ SIGCONTEXT_FPREGS
985 + ireg
* SIGCONTEXT_REG_SIZE
);
987 trad_frame_set_reg_addr (this_cache
, regs
->pc
+ NUM_REGS
,
988 sigcontext_base
+ SIGCONTEXT_PC
);
990 trad_frame_set_reg_addr (this_cache
, regs
->fp_control_status
+ NUM_REGS
,
991 sigcontext_base
+ SIGCONTEXT_FPCSR
);
992 trad_frame_set_reg_addr (this_cache
, regs
->hi
+ NUM_REGS
,
993 sigcontext_base
+ SIGCONTEXT_HI
);
994 trad_frame_set_reg_addr (this_cache
, regs
->lo
+ NUM_REGS
,
995 sigcontext_base
+ SIGCONTEXT_LO
);
996 trad_frame_set_reg_addr (this_cache
, regs
->cause
+ NUM_REGS
,
997 sigcontext_base
+ SIGCONTEXT_CAUSE
);
998 trad_frame_set_reg_addr (this_cache
, regs
->badvaddr
+ NUM_REGS
,
999 sigcontext_base
+ SIGCONTEXT_BADVADDR
);
1001 /* Choice of the bottom of the sigframe is somewhat arbitrary. */
1002 trad_frame_set_id (this_cache
,
1003 frame_id_build (func
- SIGFRAME_CODE_OFFSET
, func
));
1007 /* For N32/N64 things look different. There is no non-rt signal frame.
1009 struct rt_sigframe_n32 {
1010 u32 rs_ass[4]; [ argument save space for o32 ]
1011 u32 rs_code[2]; [ signal trampoline ]
1012 struct siginfo rs_info;
1013 struct ucontextn32 rs_uc;
1016 struct ucontextn32 {
1020 struct sigcontext uc_mcontext;
1021 sigset_t uc_sigmask; [ mask last for extensibility ]
1024 struct rt_sigframe_n32 {
1025 u32 rs_ass[4]; [ argument save space for o32 ]
1026 u32 rs_code[2]; [ signal trampoline ]
1027 struct siginfo rs_info;
1028 struct ucontext rs_uc;
1032 unsigned long uc_flags;
1033 struct ucontext *uc_link;
1035 struct sigcontext uc_mcontext;
1036 sigset_t uc_sigmask; [ mask last for extensibility ]
1039 And the sigcontext is different (this is for both n32 and n64):
1042 unsigned long long sc_regs[32];
1043 unsigned long long sc_fpregs[32];
1044 unsigned long long sc_mdhi;
1045 unsigned long long sc_mdlo;
1046 unsigned long long sc_pc;
1047 unsigned int sc_status;
1048 unsigned int sc_fpc_csr;
1049 unsigned int sc_fpc_eir;
1050 unsigned int sc_used_math;
1051 unsigned int sc_cause;
1052 unsigned int sc_badvaddr;
1056 #define N32_STACK_T_SIZE STACK_T_SIZE
1057 #define N64_STACK_T_SIZE (2 * 8 + 4)
1058 #define N32_UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + N32_STACK_T_SIZE + 4)
1059 #define N64_UCONTEXT_SIGCONTEXT_OFFSET (2 * 8 + N64_STACK_T_SIZE + 4)
1060 #define N32_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \
1061 + RTSIGFRAME_SIGINFO_SIZE \
1062 + N32_UCONTEXT_SIGCONTEXT_OFFSET)
1063 #define N64_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \
1064 + RTSIGFRAME_SIGINFO_SIZE \
1065 + N64_UCONTEXT_SIGCONTEXT_OFFSET)
1067 #define N64_SIGCONTEXT_REGS (0 * 8)
1068 #define N64_SIGCONTEXT_FPREGS (32 * 8)
1069 #define N64_SIGCONTEXT_HI (64 * 8)
1070 #define N64_SIGCONTEXT_LO (65 * 8)
1071 #define N64_SIGCONTEXT_PC (66 * 8)
1072 #define N64_SIGCONTEXT_FPCSR (67 * 8 + 1 * 4)
1073 #define N64_SIGCONTEXT_FIR (67 * 8 + 2 * 4)
1074 #define N64_SIGCONTEXT_CAUSE (67 * 8 + 4 * 4)
1075 #define N64_SIGCONTEXT_BADVADDR (67 * 8 + 5 * 4)
1077 #define N64_SIGCONTEXT_REG_SIZE 8
1080 mips_linux_n32n64_sigframe_init (const struct tramp_frame
*self
,
1081 struct frame_info
*next_frame
,
1082 struct trad_frame_cache
*this_cache
,
1085 int ireg
, reg_position
;
1086 CORE_ADDR sigcontext_base
= func
- SIGFRAME_CODE_OFFSET
;
1087 const struct mips_regnum
*regs
= mips_regnum (current_gdbarch
);
1089 if (self
== &mips_linux_n32_rt_sigframe
)
1090 sigcontext_base
+= N32_SIGFRAME_SIGCONTEXT_OFFSET
;
1092 sigcontext_base
+= N64_SIGFRAME_SIGCONTEXT_OFFSET
;
1095 trad_frame_set_reg_addr (this_cache
, ORIG_ZERO_REGNUM
+ NUM_REGS
,
1096 sigcontext_base
+ N64_SIGCONTEXT_REGS
);
1099 for (ireg
= 1; ireg
< 32; ireg
++)
1100 trad_frame_set_reg_addr (this_cache
, ireg
+ ZERO_REGNUM
+ NUM_REGS
,
1101 sigcontext_base
+ N64_SIGCONTEXT_REGS
1102 + ireg
* N64_SIGCONTEXT_REG_SIZE
);
1104 for (ireg
= 0; ireg
< 32; ireg
++)
1105 trad_frame_set_reg_addr (this_cache
, ireg
+ regs
->fp0
+ NUM_REGS
,
1106 sigcontext_base
+ N64_SIGCONTEXT_FPREGS
1107 + ireg
* N64_SIGCONTEXT_REG_SIZE
);
1109 trad_frame_set_reg_addr (this_cache
, regs
->pc
+ NUM_REGS
,
1110 sigcontext_base
+ N64_SIGCONTEXT_PC
);
1112 trad_frame_set_reg_addr (this_cache
, regs
->fp_control_status
+ NUM_REGS
,
1113 sigcontext_base
+ N64_SIGCONTEXT_FPCSR
);
1114 trad_frame_set_reg_addr (this_cache
, regs
->hi
+ NUM_REGS
,
1115 sigcontext_base
+ N64_SIGCONTEXT_HI
);
1116 trad_frame_set_reg_addr (this_cache
, regs
->lo
+ NUM_REGS
,
1117 sigcontext_base
+ N64_SIGCONTEXT_LO
);
1118 trad_frame_set_reg_addr (this_cache
, regs
->cause
+ NUM_REGS
,
1119 sigcontext_base
+ N64_SIGCONTEXT_CAUSE
);
1120 trad_frame_set_reg_addr (this_cache
, regs
->badvaddr
+ NUM_REGS
,
1121 sigcontext_base
+ N64_SIGCONTEXT_BADVADDR
);
1123 /* Choice of the bottom of the sigframe is somewhat arbitrary. */
1124 trad_frame_set_id (this_cache
,
1125 frame_id_build (func
- SIGFRAME_CODE_OFFSET
, func
));
1128 /* Initialize one of the GNU/Linux OS ABIs. */
1131 mips_linux_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
1133 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
1134 enum mips_abi abi
= mips_abi (gdbarch
);
1139 set_gdbarch_get_longjmp_target (gdbarch
,
1140 mips_linux_get_longjmp_target
);
1141 set_solib_svr4_fetch_link_map_offsets
1142 (gdbarch
, mips_linux_svr4_fetch_link_map_offsets
);
1143 set_mips_linux_register_addr (gdbarch
, mips_linux_register_addr
);
1144 tramp_frame_prepend_unwinder (gdbarch
, &mips_linux_o32_sigframe
);
1145 tramp_frame_prepend_unwinder (gdbarch
, &mips_linux_o32_rt_sigframe
);
1148 set_gdbarch_get_longjmp_target (gdbarch
,
1149 mips_linux_get_longjmp_target
);
1150 set_solib_svr4_fetch_link_map_offsets
1151 (gdbarch
, mips_linux_svr4_fetch_link_map_offsets
);
1152 set_mips_linux_register_addr (gdbarch
, mips64_linux_register_addr
);
1153 tramp_frame_prepend_unwinder (gdbarch
, &mips_linux_n32_rt_sigframe
);
1156 set_gdbarch_get_longjmp_target (gdbarch
,
1157 mips64_linux_get_longjmp_target
);
1158 set_solib_svr4_fetch_link_map_offsets
1159 (gdbarch
, mips64_linux_svr4_fetch_link_map_offsets
);
1160 set_mips_linux_register_addr (gdbarch
, mips64_linux_register_addr
);
1161 tramp_frame_prepend_unwinder (gdbarch
, &mips_linux_n64_rt_sigframe
);
1164 internal_error (__FILE__
, __LINE__
, "can't handle ABI");
1168 set_gdbarch_skip_solib_resolver (gdbarch
, mips_linux_skip_resolver
);
1170 /* This overrides the MIPS16 stub support from mips-tdep. But no
1171 one uses MIPS16 on GNU/Linux yet, so this isn't much of a loss. */
1172 set_gdbarch_in_solib_call_trampoline (gdbarch
, mips_linux_in_dynsym_stub
);
1176 _initialize_mips_linux_tdep (void)
1178 const struct bfd_arch_info
*arch_info
;
1180 register_addr_data
=
1181 gdbarch_data_register_post_init (init_register_addr_data
);
1183 for (arch_info
= bfd_lookup_arch (bfd_arch_mips
, 0);
1185 arch_info
= arch_info
->next
)
1187 gdbarch_register_osabi (bfd_arch_mips
, arch_info
->mach
, GDB_OSABI_LINUX
,
1188 mips_linux_init_abi
);
1191 deprecated_add_core_fns (®set_core_fns
);