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"
32 /* Copied from <asm/elf.h>. */
36 typedef unsigned char elf_greg_t
[4];
37 typedef elf_greg_t elf_gregset_t
[ELF_NGREG
];
39 typedef unsigned char elf_fpreg_t
[8];
40 typedef elf_fpreg_t elf_fpregset_t
[ELF_NFPREG
];
42 /* 0 - 31 are integer registers, 32 - 63 are fp registers. */
57 #define EF_CP0_BADVADDR 41
58 #define EF_CP0_STATUS 42
59 #define EF_CP0_CAUSE 43
63 /* Figure out where the longjmp will land.
64 We expect the first arg to be a pointer to the jmp_buf structure from
65 which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
66 is copied into PC. This routine returns 1 on success. */
68 #define MIPS_LINUX_JB_ELEMENT_SIZE 4
69 #define MIPS_LINUX_JB_PC 0
72 mips_linux_get_longjmp_target (CORE_ADDR
*pc
)
75 char buf
[TARGET_PTR_BIT
/ TARGET_CHAR_BIT
];
77 jb_addr
= read_register (A0_REGNUM
);
79 if (target_read_memory (jb_addr
80 + MIPS_LINUX_JB_PC
* MIPS_LINUX_JB_ELEMENT_SIZE
,
81 buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
84 *pc
= extract_unsigned_integer (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
89 /* Transform the bits comprising a 32-bit register to the right size
90 for supply_register(). This is needed when mips_regsize() is 8. */
93 supply_32bit_reg (int regnum
, const void *addr
)
95 char buf
[MAX_REGISTER_SIZE
];
96 store_signed_integer (buf
, DEPRECATED_REGISTER_RAW_SIZE (regnum
),
97 extract_signed_integer (addr
, 4));
98 supply_register (regnum
, buf
);
101 /* Unpack an elf_gregset_t into GDB's register cache. */
104 supply_gregset (elf_gregset_t
*gregsetp
)
107 elf_greg_t
*regp
= *gregsetp
;
108 char zerobuf
[MAX_REGISTER_SIZE
];
110 memset (zerobuf
, 0, MAX_REGISTER_SIZE
);
112 for (regi
= EF_REG0
; regi
<= EF_REG31
; regi
++)
113 supply_32bit_reg ((regi
- EF_REG0
), (char *)(regp
+ regi
));
115 supply_32bit_reg (mips_regnum (current_gdbarch
)->lo
,
116 (char *)(regp
+ EF_LO
));
117 supply_32bit_reg (mips_regnum (current_gdbarch
)->hi
,
118 (char *)(regp
+ EF_HI
));
120 supply_32bit_reg (mips_regnum (current_gdbarch
)->pc
,
121 (char *)(regp
+ EF_CP0_EPC
));
122 supply_32bit_reg (mips_regnum (current_gdbarch
)->badvaddr
,
123 (char *)(regp
+ EF_CP0_BADVADDR
));
124 supply_32bit_reg (PS_REGNUM
, (char *)(regp
+ EF_CP0_STATUS
));
125 supply_32bit_reg (mips_regnum (current_gdbarch
)->cause
,
126 (char *)(regp
+ EF_CP0_CAUSE
));
128 /* Fill inaccessible registers with zero. */
129 supply_register (UNUSED_REGNUM
, zerobuf
);
130 for (regi
= FIRST_EMBED_REGNUM
; regi
< LAST_EMBED_REGNUM
; regi
++)
131 supply_register (regi
, zerobuf
);
134 /* Pack our registers (or one register) into an elf_gregset_t. */
137 fill_gregset (elf_gregset_t
*gregsetp
, int regno
)
140 elf_greg_t
*regp
= *gregsetp
;
145 memset (regp
, 0, sizeof (elf_gregset_t
));
146 for (regi
= 0; regi
< 32; regi
++)
147 fill_gregset (gregsetp
, regi
);
148 fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->lo
);
149 fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->hi
);
150 fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->pc
);
151 fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->badvaddr
);
152 fill_gregset (gregsetp
, PS_REGNUM
);
153 fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->cause
);
160 dst
= regp
+ regno
+ EF_REG0
;
161 regcache_collect (regno
, dst
);
165 if (regno
== mips_regnum (current_gdbarch
)->lo
)
167 else if (regno
== mips_regnum (current_gdbarch
)->hi
)
169 else if (regno
== mips_regnum (current_gdbarch
)->pc
)
170 regaddr
= EF_CP0_EPC
;
171 else if (regno
== mips_regnum (current_gdbarch
)->badvaddr
)
172 regaddr
= EF_CP0_BADVADDR
;
173 else if (regno
== PS_REGNUM
)
174 regaddr
= EF_CP0_STATUS
;
175 else if (regno
== mips_regnum (current_gdbarch
)->cause
)
176 regaddr
= EF_CP0_CAUSE
;
182 dst
= regp
+ regaddr
;
183 regcache_collect (regno
, dst
);
187 /* Likewise, unpack an elf_fpregset_t. */
190 supply_fpregset (elf_fpregset_t
*fpregsetp
)
193 char zerobuf
[MAX_REGISTER_SIZE
];
195 memset (zerobuf
, 0, MAX_REGISTER_SIZE
);
197 for (regi
= 0; regi
< 32; regi
++)
198 supply_register (FP0_REGNUM
+ regi
,
199 (char *)(*fpregsetp
+ regi
));
201 supply_register (mips_regnum (current_gdbarch
)->fp_control_status
,
202 (char *)(*fpregsetp
+ 32));
204 /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */
205 supply_register (mips_regnum (current_gdbarch
)->fp_implementation_revision
,
209 /* Likewise, pack one or all floating point registers into an
213 fill_fpregset (elf_fpregset_t
*fpregsetp
, int regno
)
217 if ((regno
>= FP0_REGNUM
) && (regno
< FP0_REGNUM
+ 32))
219 from
= (char *) &deprecated_registers
[DEPRECATED_REGISTER_BYTE (regno
)];
220 to
= (char *) (*fpregsetp
+ regno
- FP0_REGNUM
);
221 memcpy (to
, from
, DEPRECATED_REGISTER_RAW_SIZE (regno
- FP0_REGNUM
));
223 else if (regno
== mips_regnum (current_gdbarch
)->fp_control_status
)
225 from
= (char *) &deprecated_registers
[DEPRECATED_REGISTER_BYTE (regno
)];
226 to
= (char *) (*fpregsetp
+ 32);
227 memcpy (to
, from
, DEPRECATED_REGISTER_RAW_SIZE (regno
));
229 else if (regno
== -1)
233 for (regi
= 0; regi
< 32; regi
++)
234 fill_fpregset (fpregsetp
, FP0_REGNUM
+ regi
);
235 fill_fpregset(fpregsetp
, mips_regnum (current_gdbarch
)->fp_control_status
);
239 /* Map gdb internal register number to ptrace ``address''.
240 These ``addresses'' are normally defined in <asm/ptrace.h>. */
243 mips_linux_register_addr (int regno
, CORE_ADDR blockend
)
247 if (regno
< 0 || regno
>= NUM_REGS
)
248 error ("Bogon register number %d.", regno
);
252 else if ((regno
>= mips_regnum (current_gdbarch
)->fp0
)
253 && (regno
< mips_regnum (current_gdbarch
)->fp0
+ 32))
254 regaddr
= FPR_BASE
+ (regno
- mips_regnum (current_gdbarch
)->fp0
);
255 else if (regno
== mips_regnum (current_gdbarch
)->pc
)
257 else if (regno
== mips_regnum (current_gdbarch
)->cause
)
259 else if (regno
== mips_regnum (current_gdbarch
)->badvaddr
)
261 else if (regno
== mips_regnum (current_gdbarch
)->lo
)
263 else if (regno
== mips_regnum (current_gdbarch
)->hi
)
265 else if (regno
== mips_regnum (current_gdbarch
)->fp_control_status
)
267 else if (regno
== mips_regnum (current_gdbarch
)->fp_implementation_revision
)
270 error ("Unknowable register number %d.", regno
);
276 /* Fetch (and possibly build) an appropriate link_map_offsets
277 structure for native GNU/Linux MIPS targets using the struct offsets
278 defined in link.h (but without actual reference to that file).
280 This makes it possible to access GNU/Linux MIPS shared libraries from a
281 GDB that was built on a different host platform (for cross debugging). */
283 static struct link_map_offsets
*
284 mips_linux_svr4_fetch_link_map_offsets (void)
286 static struct link_map_offsets lmo
;
287 static struct link_map_offsets
*lmp
= NULL
;
293 lmo
.r_debug_size
= 8; /* The actual size is 20 bytes, but
294 this is all we need. */
295 lmo
.r_map_offset
= 4;
298 lmo
.link_map_size
= 20;
300 lmo
.l_addr_offset
= 0;
303 lmo
.l_name_offset
= 4;
306 lmo
.l_next_offset
= 12;
309 lmo
.l_prev_offset
= 16;
316 /* Support for 64-bit ABIs. */
318 /* Copied from <asm/elf.h>. */
319 #define MIPS64_ELF_NGREG 45
320 #define MIPS64_ELF_NFPREG 33
322 typedef unsigned char mips64_elf_greg_t
[8];
323 typedef mips64_elf_greg_t mips64_elf_gregset_t
[MIPS64_ELF_NGREG
];
325 typedef unsigned char mips64_elf_fpreg_t
[8];
326 typedef mips64_elf_fpreg_t mips64_elf_fpregset_t
[MIPS64_ELF_NFPREG
];
328 /* 0 - 31 are integer registers, 32 - 63 are fp registers. */
329 #define MIPS64_FPR_BASE 32
331 #define MIPS64_CAUSE 65
332 #define MIPS64_BADVADDR 66
333 #define MIPS64_MMHI 67
334 #define MIPS64_MMLO 68
335 #define MIPS64_FPC_CSR 69
336 #define MIPS64_FPC_EIR 70
338 #define MIPS64_EF_REG0 0
339 #define MIPS64_EF_REG31 31
340 #define MIPS64_EF_LO 32
341 #define MIPS64_EF_HI 33
342 #define MIPS64_EF_CP0_EPC 34
343 #define MIPS64_EF_CP0_BADVADDR 35
344 #define MIPS64_EF_CP0_STATUS 36
345 #define MIPS64_EF_CP0_CAUSE 37
347 #define MIPS64_EF_SIZE 304
349 /* Figure out where the longjmp will land.
350 We expect the first arg to be a pointer to the jmp_buf structure from
351 which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
352 is copied into PC. This routine returns 1 on success. */
354 /* Details about jmp_buf. */
356 #define MIPS64_LINUX_JB_PC 0
359 mips64_linux_get_longjmp_target (CORE_ADDR
*pc
)
362 void *buf
= alloca (TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
363 int element_size
= TARGET_PTR_BIT
== 32 ? 4 : 8;
365 jb_addr
= read_register (A0_REGNUM
);
367 if (target_read_memory (jb_addr
+ MIPS64_LINUX_JB_PC
* element_size
,
368 buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
371 *pc
= extract_unsigned_integer (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
376 /* Unpack an elf_gregset_t into GDB's register cache. */
379 mips64_supply_gregset (mips64_elf_gregset_t
*gregsetp
)
382 mips64_elf_greg_t
*regp
= *gregsetp
;
383 char zerobuf
[MAX_REGISTER_SIZE
];
385 memset (zerobuf
, 0, MAX_REGISTER_SIZE
);
387 for (regi
= MIPS64_EF_REG0
; regi
<= MIPS64_EF_REG31
; regi
++)
388 supply_register ((regi
- MIPS64_EF_REG0
), (char *)(regp
+ regi
));
390 supply_register (mips_regnum (current_gdbarch
)->lo
,
391 (char *)(regp
+ MIPS64_EF_LO
));
392 supply_register (mips_regnum (current_gdbarch
)->hi
,
393 (char *)(regp
+ MIPS64_EF_HI
));
395 supply_register (mips_regnum (current_gdbarch
)->pc
,
396 (char *)(regp
+ MIPS64_EF_CP0_EPC
));
397 supply_register (mips_regnum (current_gdbarch
)->badvaddr
,
398 (char *)(regp
+ MIPS64_EF_CP0_BADVADDR
));
399 supply_register (PS_REGNUM
, (char *)(regp
+ MIPS64_EF_CP0_STATUS
));
400 supply_register (mips_regnum (current_gdbarch
)->cause
,
401 (char *)(regp
+ MIPS64_EF_CP0_CAUSE
));
403 /* Fill inaccessible registers with zero. */
404 supply_register (UNUSED_REGNUM
, zerobuf
);
405 for (regi
= FIRST_EMBED_REGNUM
; regi
< LAST_EMBED_REGNUM
; regi
++)
406 supply_register (regi
, zerobuf
);
409 /* Pack our registers (or one register) into an elf_gregset_t. */
412 mips64_fill_gregset (mips64_elf_gregset_t
*gregsetp
, int regno
)
415 mips64_elf_greg_t
*regp
= *gregsetp
;
420 memset (regp
, 0, sizeof (mips64_elf_gregset_t
));
421 for (regi
= 0; regi
< 32; regi
++)
422 mips64_fill_gregset (gregsetp
, regi
);
423 mips64_fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->lo
);
424 mips64_fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->hi
);
425 mips64_fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->pc
);
426 mips64_fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->badvaddr
);
427 mips64_fill_gregset (gregsetp
, PS_REGNUM
);
428 mips64_fill_gregset (gregsetp
, mips_regnum (current_gdbarch
)->cause
);
435 dst
= regp
+ regno
+ MIPS64_EF_REG0
;
436 regcache_collect (regno
, dst
);
440 if (regno
== mips_regnum (current_gdbarch
)->lo
)
441 regaddr
= MIPS64_EF_LO
;
442 else if (regno
== mips_regnum (current_gdbarch
)->hi
)
443 regaddr
= MIPS64_EF_HI
;
444 else if (regno
== mips_regnum (current_gdbarch
)->pc
)
445 regaddr
= MIPS64_EF_CP0_EPC
;
446 else if (regno
== mips_regnum (current_gdbarch
)->badvaddr
)
447 regaddr
= MIPS64_EF_CP0_BADVADDR
;
448 else if (regno
== PS_REGNUM
)
449 regaddr
= MIPS64_EF_CP0_STATUS
;
450 else if (regno
== mips_regnum (current_gdbarch
)->cause
)
451 regaddr
= MIPS64_EF_CP0_CAUSE
;
457 dst
= regp
+ regaddr
;
458 regcache_collect (regno
, dst
);
462 /* Likewise, unpack an elf_fpregset_t. */
465 mips64_supply_fpregset (mips64_elf_fpregset_t
*fpregsetp
)
468 char zerobuf
[MAX_REGISTER_SIZE
];
470 memset (zerobuf
, 0, MAX_REGISTER_SIZE
);
472 for (regi
= 0; regi
< 32; regi
++)
473 supply_register (FP0_REGNUM
+ regi
,
474 (char *)(*fpregsetp
+ regi
));
476 supply_register (mips_regnum (current_gdbarch
)->fp_control_status
,
477 (char *)(*fpregsetp
+ 32));
479 /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */
480 supply_register (mips_regnum (current_gdbarch
)->fp_implementation_revision
,
484 /* Likewise, pack one or all floating point registers into an
488 mips64_fill_fpregset (mips64_elf_fpregset_t
*fpregsetp
, int regno
)
492 if ((regno
>= FP0_REGNUM
) && (regno
< FP0_REGNUM
+ 32))
494 from
= (char *) &deprecated_registers
[DEPRECATED_REGISTER_BYTE (regno
)];
495 to
= (char *) (*fpregsetp
+ regno
- FP0_REGNUM
);
496 memcpy (to
, from
, DEPRECATED_REGISTER_RAW_SIZE (regno
- FP0_REGNUM
));
498 else if (regno
== mips_regnum (current_gdbarch
)->fp_control_status
)
500 from
= (char *) &deprecated_registers
[DEPRECATED_REGISTER_BYTE (regno
)];
501 to
= (char *) (*fpregsetp
+ 32);
502 memcpy (to
, from
, DEPRECATED_REGISTER_RAW_SIZE (regno
));
504 else if (regno
== -1)
508 for (regi
= 0; regi
< 32; regi
++)
509 mips64_fill_fpregset (fpregsetp
, FP0_REGNUM
+ regi
);
510 mips64_fill_fpregset(fpregsetp
,
511 mips_regnum (current_gdbarch
)->fp_control_status
);
516 /* Map gdb internal register number to ptrace ``address''.
517 These ``addresses'' are normally defined in <asm/ptrace.h>. */
520 mips64_linux_register_addr (int regno
, CORE_ADDR blockend
)
524 if (regno
< 0 || regno
>= NUM_REGS
)
525 error ("Bogon register number %d.", regno
);
529 else if ((regno
>= mips_regnum (current_gdbarch
)->fp0
)
530 && (regno
< mips_regnum (current_gdbarch
)->fp0
+ 32))
531 regaddr
= MIPS64_FPR_BASE
+ (regno
- FP0_REGNUM
);
532 else if (regno
== mips_regnum (current_gdbarch
)->pc
)
534 else if (regno
== mips_regnum (current_gdbarch
)->cause
)
535 regaddr
= MIPS64_CAUSE
;
536 else if (regno
== mips_regnum (current_gdbarch
)->badvaddr
)
537 regaddr
= MIPS64_BADVADDR
;
538 else if (regno
== mips_regnum (current_gdbarch
)->lo
)
539 regaddr
= MIPS64_MMLO
;
540 else if (regno
== mips_regnum (current_gdbarch
)->hi
)
541 regaddr
= MIPS64_MMHI
;
542 else if (regno
== mips_regnum (current_gdbarch
)->fp_control_status
)
543 regaddr
= MIPS64_FPC_CSR
;
544 else if (regno
== mips_regnum (current_gdbarch
)->fp_implementation_revision
)
545 regaddr
= MIPS64_FPC_EIR
;
547 error ("Unknowable register number %d.", regno
);
552 /* Use a local version of this function to get the correct types for
553 regsets, until multi-arch core support is ready. */
556 fetch_core_registers (char *core_reg_sect
, unsigned core_reg_size
,
557 int which
, CORE_ADDR reg_addr
)
559 elf_gregset_t gregset
;
560 elf_fpregset_t fpregset
;
561 mips64_elf_gregset_t gregset64
;
562 mips64_elf_fpregset_t fpregset64
;
566 if (core_reg_size
== sizeof (gregset
))
568 memcpy ((char *) &gregset
, core_reg_sect
, sizeof (gregset
));
569 supply_gregset (&gregset
);
571 else if (core_reg_size
== sizeof (gregset64
))
573 memcpy ((char *) &gregset64
, core_reg_sect
, sizeof (gregset64
));
574 mips64_supply_gregset (&gregset64
);
578 warning ("wrong size gregset struct in core file");
583 if (core_reg_size
== sizeof (fpregset
))
585 memcpy ((char *) &fpregset
, core_reg_sect
, sizeof (fpregset
));
586 supply_fpregset (&fpregset
);
588 else if (core_reg_size
== sizeof (fpregset64
))
590 memcpy ((char *) &fpregset64
, core_reg_sect
, sizeof (fpregset64
));
591 mips64_supply_fpregset (&fpregset64
);
595 warning ("wrong size fpregset struct in core file");
600 /* Register that we are able to handle ELF file formats using standard
601 procfs "regset" structures. */
603 static struct core_fns regset_core_fns
=
605 bfd_target_elf_flavour
, /* core_flavour */
606 default_check_format
, /* check_format */
607 default_core_sniffer
, /* core_sniffer */
608 fetch_core_registers
, /* core_read_registers */
612 /* Fetch (and possibly build) an appropriate link_map_offsets
613 structure for native GNU/Linux MIPS targets using the struct offsets
614 defined in link.h (but without actual reference to that file).
616 This makes it possible to access GNU/Linux MIPS shared libraries from a
617 GDB that was built on a different host platform (for cross debugging). */
619 static struct link_map_offsets
*
620 mips64_linux_svr4_fetch_link_map_offsets (void)
622 static struct link_map_offsets lmo
;
623 static struct link_map_offsets
*lmp
= NULL
;
629 lmo
.r_debug_size
= 16; /* The actual size is 40 bytes, but
630 this is all we need. */
631 lmo
.r_map_offset
= 8;
634 lmo
.link_map_size
= 40;
636 lmo
.l_addr_offset
= 0;
639 lmo
.l_name_offset
= 8;
642 lmo
.l_next_offset
= 24;
645 lmo
.l_prev_offset
= 32;
652 /* Handle for obtaining pointer to the current register_addr() function
653 for a given architecture. */
654 static struct gdbarch_data
*register_addr_data
;
657 register_addr (int regno
, CORE_ADDR blockend
)
659 CORE_ADDR (*register_addr_ptr
) (int, CORE_ADDR
) =
660 gdbarch_data (current_gdbarch
, register_addr_data
);
662 gdb_assert (register_addr_ptr
!= 0);
664 return register_addr_ptr (regno
, blockend
);
668 set_mips_linux_register_addr (struct gdbarch
*gdbarch
,
669 CORE_ADDR (*register_addr_ptr
) (int, CORE_ADDR
))
671 set_gdbarch_data (gdbarch
, register_addr_data
, register_addr_ptr
);
675 init_register_addr_data (struct gdbarch
*gdbarch
)
680 /* Check the code at PC for a dynamic linker lazy resolution stub. Because
681 they aren't in the .plt section, we pattern-match on the code generated
682 by GNU ld. They look like this:
689 (with the appropriate doubleword instructions for N64). Also return the
690 dynamic symbol index used in the last instruction. */
693 mips_linux_in_dynsym_stub (CORE_ADDR pc
, char *name
)
695 unsigned char buf
[28], *p
;
696 ULONGEST insn
, insn1
;
697 int n64
= (mips_abi (current_gdbarch
) == MIPS_ABI_N64
);
699 read_memory (pc
- 12, buf
, 28);
703 /* ld t9,0x8010(gp) */
708 /* lw t9,0x8010(gp) */
715 insn
= extract_unsigned_integer (p
, 4);
723 insn
= extract_unsigned_integer (p
+ 4, 4);
727 if (insn
!= 0x03e0782d)
733 if (insn
!= 0x03e07821)
737 insn
= extract_unsigned_integer (p
+ 8, 4);
739 if (insn
!= 0x0320f809)
742 insn
= extract_unsigned_integer (p
+ 12, 4);
745 /* daddiu t8,zero,0 */
746 if ((insn
& 0xffff0000) != 0x64180000)
751 /* addiu t8,zero,0 */
752 if ((insn
& 0xffff0000) != 0x24180000)
756 return (insn
& 0xffff);
759 /* Return non-zero iff PC belongs to the dynamic linker resolution code
763 mips_linux_in_dynsym_resolve_code (CORE_ADDR pc
)
765 /* Check whether PC is in the dynamic linker. This also checks whether
766 it is in the .plt section, which MIPS does not use. */
767 if (in_solib_dynsym_resolve_code (pc
))
770 /* Pattern match for the stub. It would be nice if there were a more
771 efficient way to avoid this check. */
772 if (mips_linux_in_dynsym_stub (pc
, NULL
))
778 /* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c,
779 and glibc_skip_solib_resolver in glibc-tdep.c. The normal glibc
780 implementation of this triggers at "fixup" from the same objfile as
781 "_dl_runtime_resolve"; MIPS GNU/Linux can trigger at
782 "__dl_runtime_resolve" directly. An unresolved PLT entry will
783 point to _dl_runtime_resolve, which will first call
784 __dl_runtime_resolve, and then pass control to the resolved
788 mips_linux_skip_resolver (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
790 struct minimal_symbol
*resolver
;
792 resolver
= lookup_minimal_symbol ("__dl_runtime_resolve", NULL
, NULL
);
794 if (resolver
&& SYMBOL_VALUE_ADDRESS (resolver
) == pc
)
795 return frame_pc_unwind (get_current_frame ());
801 mips_linux_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
803 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
804 enum mips_abi abi
= mips_abi (gdbarch
);
809 set_gdbarch_get_longjmp_target (gdbarch
,
810 mips_linux_get_longjmp_target
);
811 set_solib_svr4_fetch_link_map_offsets
812 (gdbarch
, mips_linux_svr4_fetch_link_map_offsets
);
813 set_mips_linux_register_addr (gdbarch
, mips_linux_register_addr
);
816 set_gdbarch_get_longjmp_target (gdbarch
,
817 mips_linux_get_longjmp_target
);
818 set_solib_svr4_fetch_link_map_offsets
819 (gdbarch
, mips_linux_svr4_fetch_link_map_offsets
);
820 set_mips_linux_register_addr (gdbarch
, mips64_linux_register_addr
);
823 set_gdbarch_get_longjmp_target (gdbarch
,
824 mips64_linux_get_longjmp_target
);
825 set_solib_svr4_fetch_link_map_offsets
826 (gdbarch
, mips64_linux_svr4_fetch_link_map_offsets
);
827 set_mips_linux_register_addr (gdbarch
, mips64_linux_register_addr
);
830 internal_error (__FILE__
, __LINE__
, "can't handle ABI");
834 set_gdbarch_skip_solib_resolver (gdbarch
, mips_linux_skip_resolver
);
836 /* This overrides the MIPS16 stub support from mips-tdep. But no
837 one uses MIPS16 on GNU/Linux yet, so this isn't much of a loss. */
838 set_gdbarch_in_solib_call_trampoline (gdbarch
, mips_linux_in_dynsym_stub
);
842 _initialize_mips_linux_tdep (void)
844 const struct bfd_arch_info
*arch_info
;
847 register_gdbarch_data (init_register_addr_data
);
849 for (arch_info
= bfd_lookup_arch (bfd_arch_mips
, 0);
851 arch_info
= arch_info
->next
)
853 gdbarch_register_osabi (bfd_arch_mips
, arch_info
->mach
, GDB_OSABI_LINUX
,
854 mips_linux_init_abi
);
857 add_core_fns (®set_core_fns
);