1 /* Target-dependent code for GNU/Linux on MIPS processors.
3 Copyright 2001, 2002 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 /* Copied from <asm/elf.h>. */
35 typedef unsigned char elf_greg_t
[4];
36 typedef elf_greg_t elf_gregset_t
[ELF_NGREG
];
38 typedef unsigned char elf_fpreg_t
[8];
39 typedef elf_fpreg_t elf_fpregset_t
[ELF_NFPREG
];
41 /* 0 - 31 are integer registers, 32 - 63 are fp registers. */
56 #define EF_CP0_BADVADDR 41
57 #define EF_CP0_STATUS 42
58 #define EF_CP0_CAUSE 43
62 /* Figure out where the longjmp will land.
63 We expect the first arg to be a pointer to the jmp_buf structure from
64 which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
65 is copied into PC. This routine returns 1 on success. */
67 #define MIPS_LINUX_JB_ELEMENT_SIZE 4
68 #define MIPS_LINUX_JB_PC 0
71 mips_linux_get_longjmp_target (CORE_ADDR
*pc
)
74 char buf
[TARGET_PTR_BIT
/ TARGET_CHAR_BIT
];
76 jb_addr
= read_register (A0_REGNUM
);
78 if (target_read_memory (jb_addr
79 + MIPS_LINUX_JB_PC
* MIPS_LINUX_JB_ELEMENT_SIZE
,
80 buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
83 *pc
= extract_unsigned_integer (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
88 /* Transform the bits comprising a 32-bit register to the right
89 size for supply_register(). This is needed when MIPS_REGSIZE is 8. */
92 supply_32bit_reg (int regnum
, const void *addr
)
94 char buf
[MAX_REGISTER_SIZE
];
95 store_signed_integer (buf
, DEPRECATED_REGISTER_RAW_SIZE (regnum
),
96 extract_signed_integer (addr
, 4));
97 supply_register (regnum
, buf
);
100 /* Unpack an elf_gregset_t into GDB's register cache. */
103 supply_gregset (elf_gregset_t
*gregsetp
)
106 elf_greg_t
*regp
= *gregsetp
;
107 char zerobuf
[MAX_REGISTER_SIZE
];
109 memset (zerobuf
, 0, MAX_REGISTER_SIZE
);
111 for (regi
= EF_REG0
; regi
<= EF_REG31
; regi
++)
112 supply_32bit_reg ((regi
- EF_REG0
), (char *)(regp
+ regi
));
114 supply_32bit_reg (LO_REGNUM
, (char *)(regp
+ EF_LO
));
115 supply_32bit_reg (HI_REGNUM
, (char *)(regp
+ EF_HI
));
117 supply_32bit_reg (PC_REGNUM
, (char *)(regp
+ EF_CP0_EPC
));
118 supply_32bit_reg (BADVADDR_REGNUM
, (char *)(regp
+ EF_CP0_BADVADDR
));
119 supply_32bit_reg (PS_REGNUM
, (char *)(regp
+ EF_CP0_STATUS
));
120 supply_32bit_reg (CAUSE_REGNUM
, (char *)(regp
+ EF_CP0_CAUSE
));
122 /* Fill inaccessible registers with zero. */
123 supply_register (UNUSED_REGNUM
, zerobuf
);
124 for (regi
= FIRST_EMBED_REGNUM
; regi
< LAST_EMBED_REGNUM
; regi
++)
125 supply_register (regi
, zerobuf
);
128 /* Pack our registers (or one register) into an elf_gregset_t. */
131 fill_gregset (elf_gregset_t
*gregsetp
, int regno
)
134 elf_greg_t
*regp
= *gregsetp
;
139 memset (regp
, 0, sizeof (elf_gregset_t
));
140 for (regi
= 0; regi
< 32; regi
++)
141 fill_gregset (gregsetp
, regi
);
142 fill_gregset (gregsetp
, LO_REGNUM
);
143 fill_gregset (gregsetp
, HI_REGNUM
);
144 fill_gregset (gregsetp
, PC_REGNUM
);
145 fill_gregset (gregsetp
, BADVADDR_REGNUM
);
146 fill_gregset (gregsetp
, PS_REGNUM
);
147 fill_gregset (gregsetp
, CAUSE_REGNUM
);
154 dst
= regp
+ regno
+ EF_REG0
;
155 regcache_collect (regno
, dst
);
169 regaddr
= EF_CP0_EPC
;
171 case BADVADDR_REGNUM
:
172 regaddr
= EF_CP0_BADVADDR
;
175 regaddr
= EF_CP0_STATUS
;
178 regaddr
= EF_CP0_CAUSE
;
184 dst
= regp
+ regaddr
;
185 regcache_collect (regno
, dst
);
189 /* Likewise, unpack an elf_fpregset_t. */
192 supply_fpregset (elf_fpregset_t
*fpregsetp
)
195 char zerobuf
[MAX_REGISTER_SIZE
];
197 memset (zerobuf
, 0, MAX_REGISTER_SIZE
);
199 for (regi
= 0; regi
< 32; regi
++)
200 supply_register (FP0_REGNUM
+ regi
,
201 (char *)(*fpregsetp
+ regi
));
203 supply_register (FCRCS_REGNUM
, (char *)(*fpregsetp
+ 32));
205 /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
206 supply_register (FCRIR_REGNUM
, zerobuf
);
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
== FCRCS_REGNUM
)
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
, FCRCS_REGNUM
);
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
>= FP0_REGNUM
) && (regno
< FP0_REGNUM
+ 32))
253 regaddr
= FPR_BASE
+ (regno
- FP0_REGNUM
);
254 else if (regno
== PC_REGNUM
)
256 else if (regno
== CAUSE_REGNUM
)
258 else if (regno
== BADVADDR_REGNUM
)
260 else if (regno
== LO_REGNUM
)
262 else if (regno
== HI_REGNUM
)
264 else if (regno
== FCRCS_REGNUM
)
266 else if (regno
== FCRIR_REGNUM
)
269 error ("Unknowable register number %d.", regno
);
275 /* Fetch (and possibly build) an appropriate link_map_offsets
276 structure for native GNU/Linux MIPS targets using the struct offsets
277 defined in link.h (but without actual reference to that file).
279 This makes it possible to access GNU/Linux MIPS shared libraries from a
280 GDB that was built on a different host platform (for cross debugging). */
282 static struct link_map_offsets
*
283 mips_linux_svr4_fetch_link_map_offsets (void)
285 static struct link_map_offsets lmo
;
286 static struct link_map_offsets
*lmp
= NULL
;
292 lmo
.r_debug_size
= 8; /* The actual size is 20 bytes, but
293 this is all we need. */
294 lmo
.r_map_offset
= 4;
297 lmo
.link_map_size
= 20;
299 lmo
.l_addr_offset
= 0;
302 lmo
.l_name_offset
= 4;
305 lmo
.l_next_offset
= 12;
308 lmo
.l_prev_offset
= 16;
315 /* Support for 64-bit ABIs. */
317 /* Copied from <asm/elf.h>. */
318 #define MIPS64_ELF_NGREG 45
319 #define MIPS64_ELF_NFPREG 33
321 typedef unsigned char mips64_elf_greg_t
[8];
322 typedef mips64_elf_greg_t mips64_elf_gregset_t
[MIPS64_ELF_NGREG
];
324 typedef unsigned char mips64_elf_fpreg_t
[8];
325 typedef mips64_elf_fpreg_t mips64_elf_fpregset_t
[MIPS64_ELF_NFPREG
];
327 /* 0 - 31 are integer registers, 32 - 63 are fp registers. */
328 #define MIPS64_FPR_BASE 32
330 #define MIPS64_CAUSE 65
331 #define MIPS64_BADVADDR 66
332 #define MIPS64_MMHI 67
333 #define MIPS64_MMLO 68
334 #define MIPS64_FPC_CSR 69
335 #define MIPS64_FPC_EIR 70
337 #define MIPS64_EF_REG0 0
338 #define MIPS64_EF_REG31 31
339 #define MIPS64_EF_LO 32
340 #define MIPS64_EF_HI 33
341 #define MIPS64_EF_CP0_EPC 34
342 #define MIPS64_EF_CP0_BADVADDR 35
343 #define MIPS64_EF_CP0_STATUS 36
344 #define MIPS64_EF_CP0_CAUSE 37
346 #define MIPS64_EF_SIZE 304
348 /* Figure out where the longjmp will land.
349 We expect the first arg to be a pointer to the jmp_buf structure from
350 which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
351 is copied into PC. This routine returns 1 on success. */
353 /* Details about jmp_buf. */
355 #define MIPS64_LINUX_JB_PC 0
358 mips64_linux_get_longjmp_target (CORE_ADDR
*pc
)
361 void *buf
= alloca (TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
362 int element_size
= TARGET_PTR_BIT
== 32 ? 4 : 8;
364 jb_addr
= read_register (A0_REGNUM
);
366 if (target_read_memory (jb_addr
+ MIPS64_LINUX_JB_PC
* element_size
,
367 buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
))
370 *pc
= extract_unsigned_integer (buf
, TARGET_PTR_BIT
/ TARGET_CHAR_BIT
);
375 /* Unpack an elf_gregset_t into GDB's register cache. */
378 mips64_supply_gregset (mips64_elf_gregset_t
*gregsetp
)
381 mips64_elf_greg_t
*regp
= *gregsetp
;
382 char zerobuf
[MAX_REGISTER_SIZE
];
384 memset (zerobuf
, 0, MAX_REGISTER_SIZE
);
386 for (regi
= MIPS64_EF_REG0
; regi
<= MIPS64_EF_REG31
; regi
++)
387 supply_register ((regi
- MIPS64_EF_REG0
), (char *)(regp
+ regi
));
389 supply_register (LO_REGNUM
, (char *)(regp
+ MIPS64_EF_LO
));
390 supply_register (HI_REGNUM
, (char *)(regp
+ MIPS64_EF_HI
));
392 supply_register (PC_REGNUM
, (char *)(regp
+ MIPS64_EF_CP0_EPC
));
393 supply_register (BADVADDR_REGNUM
, (char *)(regp
+ MIPS64_EF_CP0_BADVADDR
));
394 supply_register (PS_REGNUM
, (char *)(regp
+ MIPS64_EF_CP0_STATUS
));
395 supply_register (CAUSE_REGNUM
, (char *)(regp
+ MIPS64_EF_CP0_CAUSE
));
397 /* Fill inaccessible registers with zero. */
398 supply_register (UNUSED_REGNUM
, zerobuf
);
399 for (regi
= FIRST_EMBED_REGNUM
; regi
< LAST_EMBED_REGNUM
; regi
++)
400 supply_register (regi
, zerobuf
);
403 /* Pack our registers (or one register) into an elf_gregset_t. */
406 mips64_fill_gregset (mips64_elf_gregset_t
*gregsetp
, int regno
)
409 mips64_elf_greg_t
*regp
= *gregsetp
;
414 memset (regp
, 0, sizeof (mips64_elf_gregset_t
));
415 for (regi
= 0; regi
< 32; regi
++)
416 mips64_fill_gregset (gregsetp
, regi
);
417 mips64_fill_gregset (gregsetp
, LO_REGNUM
);
418 mips64_fill_gregset (gregsetp
, HI_REGNUM
);
419 mips64_fill_gregset (gregsetp
, PC_REGNUM
);
420 mips64_fill_gregset (gregsetp
, BADVADDR_REGNUM
);
421 mips64_fill_gregset (gregsetp
, PS_REGNUM
);
422 mips64_fill_gregset (gregsetp
, CAUSE_REGNUM
);
429 dst
= regp
+ regno
+ MIPS64_EF_REG0
;
430 regcache_collect (regno
, dst
);
438 regaddr
= MIPS64_EF_LO
;
441 regaddr
= MIPS64_EF_HI
;
444 regaddr
= MIPS64_EF_CP0_EPC
;
446 case BADVADDR_REGNUM
:
447 regaddr
= MIPS64_EF_CP0_BADVADDR
;
450 regaddr
= MIPS64_EF_CP0_STATUS
;
453 regaddr
= MIPS64_EF_CP0_CAUSE
;
459 dst
= regp
+ regaddr
;
460 regcache_collect (regno
, dst
);
464 /* Likewise, unpack an elf_fpregset_t. */
467 mips64_supply_fpregset (mips64_elf_fpregset_t
*fpregsetp
)
470 char zerobuf
[MAX_REGISTER_SIZE
];
472 memset (zerobuf
, 0, MAX_REGISTER_SIZE
);
474 for (regi
= 0; regi
< 32; regi
++)
475 supply_register (FP0_REGNUM
+ regi
,
476 (char *)(*fpregsetp
+ regi
));
478 supply_register (FCRCS_REGNUM
, (char *)(*fpregsetp
+ 32));
480 /* FIXME: how can we supply FCRIR_REGNUM? The ABI doesn't tell us. */
481 supply_register (FCRIR_REGNUM
, zerobuf
);
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
== FCRCS_REGNUM
)
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
, FCRCS_REGNUM
);
515 /* Map gdb internal register number to ptrace ``address''.
516 These ``addresses'' are normally defined in <asm/ptrace.h>. */
519 mips64_linux_register_addr (int regno
, CORE_ADDR blockend
)
523 if (regno
< 0 || regno
>= NUM_REGS
)
524 error ("Bogon register number %d.", regno
);
528 else if ((regno
>= FP0_REGNUM
) && (regno
< FP0_REGNUM
+ 32))
529 regaddr
= MIPS64_FPR_BASE
+ (regno
- FP0_REGNUM
);
530 else if (regno
== PC_REGNUM
)
532 else if (regno
== CAUSE_REGNUM
)
533 regaddr
= MIPS64_CAUSE
;
534 else if (regno
== BADVADDR_REGNUM
)
535 regaddr
= MIPS64_BADVADDR
;
536 else if (regno
== LO_REGNUM
)
537 regaddr
= MIPS64_MMLO
;
538 else if (regno
== HI_REGNUM
)
539 regaddr
= MIPS64_MMHI
;
540 else if (regno
== FCRCS_REGNUM
)
541 regaddr
= MIPS64_FPC_CSR
;
542 else if (regno
== FCRIR_REGNUM
)
543 regaddr
= MIPS64_FPC_EIR
;
545 error ("Unknowable register number %d.", regno
);
550 /* Use a local version of this function to get the correct types for
551 regsets, until multi-arch core support is ready. */
554 fetch_core_registers (char *core_reg_sect
, unsigned core_reg_size
,
555 int which
, CORE_ADDR reg_addr
)
557 elf_gregset_t gregset
;
558 elf_fpregset_t fpregset
;
559 mips64_elf_gregset_t gregset64
;
560 mips64_elf_fpregset_t fpregset64
;
564 if (core_reg_size
== sizeof (gregset
))
566 memcpy ((char *) &gregset
, core_reg_sect
, sizeof (gregset
));
567 supply_gregset (&gregset
);
569 else if (core_reg_size
== sizeof (gregset64
))
571 memcpy ((char *) &gregset64
, core_reg_sect
, sizeof (gregset64
));
572 mips64_supply_gregset (&gregset64
);
576 warning ("wrong size gregset struct in core file");
581 if (core_reg_size
== sizeof (fpregset
))
583 memcpy ((char *) &fpregset
, core_reg_sect
, sizeof (fpregset
));
584 supply_fpregset (&fpregset
);
586 else if (core_reg_size
== sizeof (fpregset64
))
588 memcpy ((char *) &fpregset64
, core_reg_sect
, sizeof (fpregset64
));
589 mips64_supply_fpregset (&fpregset64
);
593 warning ("wrong size fpregset struct in core file");
598 /* Register that we are able to handle ELF file formats using standard
599 procfs "regset" structures. */
601 static struct core_fns regset_core_fns
=
603 bfd_target_elf_flavour
, /* core_flavour */
604 default_check_format
, /* check_format */
605 default_core_sniffer
, /* core_sniffer */
606 fetch_core_registers
, /* core_read_registers */
610 /* Fetch (and possibly build) an appropriate link_map_offsets
611 structure for native GNU/Linux MIPS targets using the struct offsets
612 defined in link.h (but without actual reference to that file).
614 This makes it possible to access GNU/Linux MIPS shared libraries from a
615 GDB that was built on a different host platform (for cross debugging). */
617 static struct link_map_offsets
*
618 mips64_linux_svr4_fetch_link_map_offsets (void)
620 static struct link_map_offsets lmo
;
621 static struct link_map_offsets
*lmp
= NULL
;
627 lmo
.r_debug_size
= 16; /* The actual size is 40 bytes, but
628 this is all we need. */
629 lmo
.r_map_offset
= 8;
632 lmo
.link_map_size
= 40;
634 lmo
.l_addr_offset
= 0;
637 lmo
.l_name_offset
= 8;
640 lmo
.l_next_offset
= 24;
643 lmo
.l_prev_offset
= 32;
650 /* Handle for obtaining pointer to the current register_addr() function
651 for a given architecture. */
652 static struct gdbarch_data
*register_addr_data
;
655 register_addr (int regno
, CORE_ADDR blockend
)
657 CORE_ADDR (*register_addr_ptr
) (int, CORE_ADDR
) =
658 gdbarch_data (current_gdbarch
, register_addr_data
);
660 gdb_assert (register_addr_ptr
!= 0);
662 return register_addr_ptr (regno
, blockend
);
666 set_mips_linux_register_addr (struct gdbarch
*gdbarch
,
667 CORE_ADDR (*register_addr_ptr
) (int, CORE_ADDR
))
669 set_gdbarch_data (gdbarch
, register_addr_data
, register_addr_ptr
);
673 init_register_addr_data (struct gdbarch
*gdbarch
)
679 mips_linux_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
681 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
682 enum mips_abi abi
= mips_abi (gdbarch
);
687 set_gdbarch_get_longjmp_target (gdbarch
,
688 mips_linux_get_longjmp_target
);
689 set_solib_svr4_fetch_link_map_offsets
690 (gdbarch
, mips_linux_svr4_fetch_link_map_offsets
);
691 set_mips_linux_register_addr (gdbarch
, mips_linux_register_addr
);
694 set_gdbarch_get_longjmp_target (gdbarch
,
695 mips_linux_get_longjmp_target
);
696 set_solib_svr4_fetch_link_map_offsets
697 (gdbarch
, mips_linux_svr4_fetch_link_map_offsets
);
698 set_mips_linux_register_addr (gdbarch
, mips64_linux_register_addr
);
701 set_gdbarch_get_longjmp_target (gdbarch
,
702 mips64_linux_get_longjmp_target
);
703 set_solib_svr4_fetch_link_map_offsets
704 (gdbarch
, mips64_linux_svr4_fetch_link_map_offsets
);
705 set_mips_linux_register_addr (gdbarch
, mips64_linux_register_addr
);
708 internal_error (__FILE__
, __LINE__
, "can't handle ABI");
714 _initialize_mips_linux_tdep (void)
716 const struct bfd_arch_info
*arch_info
;
719 register_gdbarch_data (init_register_addr_data
);
721 for (arch_info
= bfd_lookup_arch (bfd_arch_mips
, 0);
723 arch_info
= arch_info
->next
)
725 gdbarch_register_osabi (bfd_arch_mips
, arch_info
->mach
, GDB_OSABI_LINUX
,
726 mips_linux_init_abi
);
729 add_core_fns (®set_core_fns
);