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 supply_register(). This is needed when mips_regsize() is 8. */
95 supply_32bit_reg (int regnum, const void *addr)
97 char buf[MAX_REGISTER_SIZE];
98 store_signed_integer (buf, DEPRECATED_REGISTER_RAW_SIZE (regnum),
99 extract_signed_integer (addr, 4));
100 supply_register (regnum, buf);
103 /* Unpack an elf_gregset_t into GDB's register cache. */
106 supply_gregset (elf_gregset_t *gregsetp)
109 elf_greg_t *regp = *gregsetp;
110 char zerobuf[MAX_REGISTER_SIZE];
112 memset (zerobuf, 0, MAX_REGISTER_SIZE);
114 for (regi = EF_REG0; regi <= EF_REG31; regi++)
115 supply_32bit_reg ((regi - EF_REG0), (char *)(regp + regi));
117 supply_32bit_reg (mips_regnum (current_gdbarch)->lo,
118 (char *)(regp + EF_LO));
119 supply_32bit_reg (mips_regnum (current_gdbarch)->hi,
120 (char *)(regp + EF_HI));
122 supply_32bit_reg (mips_regnum (current_gdbarch)->pc,
123 (char *)(regp + EF_CP0_EPC));
124 supply_32bit_reg (mips_regnum (current_gdbarch)->badvaddr,
125 (char *)(regp + EF_CP0_BADVADDR));
126 supply_32bit_reg (PS_REGNUM, (char *)(regp + EF_CP0_STATUS));
127 supply_32bit_reg (mips_regnum (current_gdbarch)->cause,
128 (char *)(regp + EF_CP0_CAUSE));
130 /* Fill inaccessible registers with zero. */
131 supply_register (UNUSED_REGNUM, zerobuf);
132 for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
133 supply_register (regi, zerobuf);
136 /* Pack our registers (or one register) into an elf_gregset_t. */
139 fill_gregset (elf_gregset_t *gregsetp, int regno)
142 elf_greg_t *regp = *gregsetp;
147 memset (regp, 0, sizeof (elf_gregset_t));
148 for (regi = 0; regi < 32; regi++)
149 fill_gregset (gregsetp, regi);
150 fill_gregset (gregsetp, mips_regnum (current_gdbarch)->lo);
151 fill_gregset (gregsetp, mips_regnum (current_gdbarch)->hi);
152 fill_gregset (gregsetp, mips_regnum (current_gdbarch)->pc);
153 fill_gregset (gregsetp, mips_regnum (current_gdbarch)->badvaddr);
154 fill_gregset (gregsetp, PS_REGNUM);
155 fill_gregset (gregsetp, mips_regnum (current_gdbarch)->cause);
162 dst = regp + regno + EF_REG0;
163 regcache_collect (regno, dst);
167 if (regno == mips_regnum (current_gdbarch)->lo)
169 else if (regno == mips_regnum (current_gdbarch)->hi)
171 else if (regno == mips_regnum (current_gdbarch)->pc)
172 regaddr = EF_CP0_EPC;
173 else if (regno == mips_regnum (current_gdbarch)->badvaddr)
174 regaddr = EF_CP0_BADVADDR;
175 else if (regno == PS_REGNUM)
176 regaddr = EF_CP0_STATUS;
177 else if (regno == mips_regnum (current_gdbarch)->cause)
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 (mips_regnum (current_gdbarch)->fp_control_status,
204 (char *)(*fpregsetp + 32));
206 /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */
207 supply_register (mips_regnum (current_gdbarch)->fp_implementation_revision,
211 /* Likewise, pack one or all floating point registers into an
215 fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
219 if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
221 from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
222 to = (char *) (*fpregsetp + regno - FP0_REGNUM);
223 memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno - FP0_REGNUM));
225 else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
227 from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
228 to = (char *) (*fpregsetp + 32);
229 memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno));
231 else if (regno == -1)
235 for (regi = 0; regi < 32; regi++)
236 fill_fpregset (fpregsetp, FP0_REGNUM + regi);
237 fill_fpregset(fpregsetp, mips_regnum (current_gdbarch)->fp_control_status);
241 /* Map gdb internal register number to ptrace ``address''.
242 These ``addresses'' are normally defined in <asm/ptrace.h>. */
245 mips_linux_register_addr (int regno, CORE_ADDR blockend)
249 if (regno < 0 || regno >= NUM_REGS)
250 error ("Bogon register number %d.", regno);
254 else if ((regno >= mips_regnum (current_gdbarch)->fp0)
255 && (regno < mips_regnum (current_gdbarch)->fp0 + 32))
256 regaddr = FPR_BASE + (regno - mips_regnum (current_gdbarch)->fp0);
257 else if (regno == mips_regnum (current_gdbarch)->pc)
259 else if (regno == mips_regnum (current_gdbarch)->cause)
261 else if (regno == mips_regnum (current_gdbarch)->badvaddr)
263 else if (regno == mips_regnum (current_gdbarch)->lo)
265 else if (regno == mips_regnum (current_gdbarch)->hi)
267 else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
269 else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
272 error ("Unknowable register number %d.", regno);
278 /* Fetch (and possibly build) an appropriate link_map_offsets
279 structure for native GNU/Linux MIPS targets using the struct offsets
280 defined in link.h (but without actual reference to that file).
282 This makes it possible to access GNU/Linux MIPS shared libraries from a
283 GDB that was built on a different host platform (for cross debugging). */
285 static struct link_map_offsets *
286 mips_linux_svr4_fetch_link_map_offsets (void)
288 static struct link_map_offsets lmo;
289 static struct link_map_offsets *lmp = NULL;
295 lmo.r_debug_size = 8; /* The actual size is 20 bytes, but
296 this is all we need. */
297 lmo.r_map_offset = 4;
300 lmo.link_map_size = 20;
302 lmo.l_addr_offset = 0;
305 lmo.l_name_offset = 4;
308 lmo.l_next_offset = 12;
311 lmo.l_prev_offset = 16;
318 /* Support for 64-bit ABIs. */
320 /* Copied from <asm/elf.h>. */
321 #define MIPS64_ELF_NGREG 45
322 #define MIPS64_ELF_NFPREG 33
324 typedef unsigned char mips64_elf_greg_t[8];
325 typedef mips64_elf_greg_t mips64_elf_gregset_t[MIPS64_ELF_NGREG];
327 typedef unsigned char mips64_elf_fpreg_t[8];
328 typedef mips64_elf_fpreg_t mips64_elf_fpregset_t[MIPS64_ELF_NFPREG];
330 /* 0 - 31 are integer registers, 32 - 63 are fp registers. */
331 #define MIPS64_FPR_BASE 32
333 #define MIPS64_CAUSE 65
334 #define MIPS64_BADVADDR 66
335 #define MIPS64_MMHI 67
336 #define MIPS64_MMLO 68
337 #define MIPS64_FPC_CSR 69
338 #define MIPS64_FPC_EIR 70
340 #define MIPS64_EF_REG0 0
341 #define MIPS64_EF_REG31 31
342 #define MIPS64_EF_LO 32
343 #define MIPS64_EF_HI 33
344 #define MIPS64_EF_CP0_EPC 34
345 #define MIPS64_EF_CP0_BADVADDR 35
346 #define MIPS64_EF_CP0_STATUS 36
347 #define MIPS64_EF_CP0_CAUSE 37
349 #define MIPS64_EF_SIZE 304
351 /* Figure out where the longjmp will land.
352 We expect the first arg to be a pointer to the jmp_buf structure from
353 which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
354 is copied into PC. This routine returns 1 on success. */
356 /* Details about jmp_buf. */
358 #define MIPS64_LINUX_JB_PC 0
361 mips64_linux_get_longjmp_target (CORE_ADDR *pc)
364 void *buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
365 int element_size = TARGET_PTR_BIT == 32 ? 4 : 8;
367 jb_addr = read_register (A0_REGNUM);
369 if (target_read_memory (jb_addr + MIPS64_LINUX_JB_PC * element_size,
370 buf, TARGET_PTR_BIT / TARGET_CHAR_BIT))
373 *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
378 /* Unpack an elf_gregset_t into GDB's register cache. */
381 mips64_supply_gregset (mips64_elf_gregset_t *gregsetp)
384 mips64_elf_greg_t *regp = *gregsetp;
385 char zerobuf[MAX_REGISTER_SIZE];
387 memset (zerobuf, 0, MAX_REGISTER_SIZE);
389 for (regi = MIPS64_EF_REG0; regi <= MIPS64_EF_REG31; regi++)
390 supply_register ((regi - MIPS64_EF_REG0), (char *)(regp + regi));
392 supply_register (mips_regnum (current_gdbarch)->lo,
393 (char *)(regp + MIPS64_EF_LO));
394 supply_register (mips_regnum (current_gdbarch)->hi,
395 (char *)(regp + MIPS64_EF_HI));
397 supply_register (mips_regnum (current_gdbarch)->pc,
398 (char *)(regp + MIPS64_EF_CP0_EPC));
399 supply_register (mips_regnum (current_gdbarch)->badvaddr,
400 (char *)(regp + MIPS64_EF_CP0_BADVADDR));
401 supply_register (PS_REGNUM, (char *)(regp + MIPS64_EF_CP0_STATUS));
402 supply_register (mips_regnum (current_gdbarch)->cause,
403 (char *)(regp + MIPS64_EF_CP0_CAUSE));
405 /* Fill inaccessible registers with zero. */
406 supply_register (UNUSED_REGNUM, zerobuf);
407 for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
408 supply_register (regi, zerobuf);
411 /* Pack our registers (or one register) into an elf_gregset_t. */
414 mips64_fill_gregset (mips64_elf_gregset_t *gregsetp, int regno)
417 mips64_elf_greg_t *regp = *gregsetp;
422 memset (regp, 0, sizeof (mips64_elf_gregset_t));
423 for (regi = 0; regi < 32; regi++)
424 mips64_fill_gregset (gregsetp, regi);
425 mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->lo);
426 mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->hi);
427 mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->pc);
428 mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->badvaddr);
429 mips64_fill_gregset (gregsetp, PS_REGNUM);
430 mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->cause);
437 dst = regp + regno + MIPS64_EF_REG0;
438 regcache_collect (regno, dst);
442 if (regno == mips_regnum (current_gdbarch)->lo)
443 regaddr = MIPS64_EF_LO;
444 else if (regno == mips_regnum (current_gdbarch)->hi)
445 regaddr = MIPS64_EF_HI;
446 else if (regno == mips_regnum (current_gdbarch)->pc)
447 regaddr = MIPS64_EF_CP0_EPC;
448 else if (regno == mips_regnum (current_gdbarch)->badvaddr)
449 regaddr = MIPS64_EF_CP0_BADVADDR;
450 else if (regno == PS_REGNUM)
451 regaddr = MIPS64_EF_CP0_STATUS;
452 else if (regno == mips_regnum (current_gdbarch)->cause)
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 (mips_regnum (current_gdbarch)->fp_control_status,
479 (char *)(*fpregsetp + 32));
481 /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */
482 supply_register (mips_regnum (current_gdbarch)->fp_implementation_revision,
486 /* Likewise, pack one or all floating point registers into an
490 mips64_fill_fpregset (mips64_elf_fpregset_t *fpregsetp, int regno)
494 if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
496 from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
497 to = (char *) (*fpregsetp + regno - FP0_REGNUM);
498 memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno - FP0_REGNUM));
500 else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
502 from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
503 to = (char *) (*fpregsetp + 32);
504 memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno));
506 else if (regno == -1)
510 for (regi = 0; regi < 32; regi++)
511 mips64_fill_fpregset (fpregsetp, FP0_REGNUM + regi);
512 mips64_fill_fpregset(fpregsetp,
513 mips_regnum (current_gdbarch)->fp_control_status);
518 /* Map gdb internal register number to ptrace ``address''.
519 These ``addresses'' are normally defined in <asm/ptrace.h>. */
522 mips64_linux_register_addr (int regno, CORE_ADDR blockend)
526 if (regno < 0 || regno >= NUM_REGS)
527 error ("Bogon register number %d.", regno);
531 else if ((regno >= mips_regnum (current_gdbarch)->fp0)
532 && (regno < mips_regnum (current_gdbarch)->fp0 + 32))
533 regaddr = MIPS64_FPR_BASE + (regno - FP0_REGNUM);
534 else if (regno == mips_regnum (current_gdbarch)->pc)
536 else if (regno == mips_regnum (current_gdbarch)->cause)
537 regaddr = MIPS64_CAUSE;
538 else if (regno == mips_regnum (current_gdbarch)->badvaddr)
539 regaddr = MIPS64_BADVADDR;
540 else if (regno == mips_regnum (current_gdbarch)->lo)
541 regaddr = MIPS64_MMLO;
542 else if (regno == mips_regnum (current_gdbarch)->hi)
543 regaddr = MIPS64_MMHI;
544 else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
545 regaddr = MIPS64_FPC_CSR;
546 else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
547 regaddr = MIPS64_FPC_EIR;
549 error ("Unknowable register number %d.", regno);
554 /* Use a local version of this function to get the correct types for
555 regsets, until multi-arch core support is ready. */
558 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
559 int which, CORE_ADDR reg_addr)
561 elf_gregset_t gregset;
562 elf_fpregset_t fpregset;
563 mips64_elf_gregset_t gregset64;
564 mips64_elf_fpregset_t fpregset64;
568 if (core_reg_size == sizeof (gregset))
570 memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
571 supply_gregset (&gregset);
573 else if (core_reg_size == sizeof (gregset64))
575 memcpy ((char *) &gregset64, core_reg_sect, sizeof (gregset64));
576 mips64_supply_gregset (&gregset64);
580 warning ("wrong size gregset struct in core file");
585 if (core_reg_size == sizeof (fpregset))
587 memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
588 supply_fpregset (&fpregset);
590 else if (core_reg_size == sizeof (fpregset64))
592 memcpy ((char *) &fpregset64, core_reg_sect, sizeof (fpregset64));
593 mips64_supply_fpregset (&fpregset64);
597 warning ("wrong size fpregset struct in core file");
602 /* Register that we are able to handle ELF file formats using standard
603 procfs "regset" structures. */
605 static struct core_fns regset_core_fns =
607 bfd_target_elf_flavour, /* core_flavour */
608 default_check_format, /* check_format */
609 default_core_sniffer, /* core_sniffer */
610 fetch_core_registers, /* core_read_registers */
614 /* Fetch (and possibly build) an appropriate link_map_offsets
615 structure for native GNU/Linux MIPS targets using the struct offsets
616 defined in link.h (but without actual reference to that file).
618 This makes it possible to access GNU/Linux MIPS shared libraries from a
619 GDB that was built on a different host platform (for cross debugging). */
621 static struct link_map_offsets *
622 mips64_linux_svr4_fetch_link_map_offsets (void)
624 static struct link_map_offsets lmo;
625 static struct link_map_offsets *lmp = NULL;
631 lmo.r_debug_size = 16; /* The actual size is 40 bytes, but
632 this is all we need. */
633 lmo.r_map_offset = 8;
636 lmo.link_map_size = 40;
638 lmo.l_addr_offset = 0;
641 lmo.l_name_offset = 8;
644 lmo.l_next_offset = 24;
647 lmo.l_prev_offset = 32;
654 /* Handle for obtaining pointer to the current register_addr() function
655 for a given architecture. */
656 static struct gdbarch_data *register_addr_data;
659 register_addr (int regno, CORE_ADDR blockend)
661 CORE_ADDR (*register_addr_ptr) (int, CORE_ADDR) =
662 gdbarch_data (current_gdbarch, register_addr_data);
664 gdb_assert (register_addr_ptr != 0);
666 return register_addr_ptr (regno, blockend);
670 set_mips_linux_register_addr (struct gdbarch *gdbarch,
671 CORE_ADDR (*register_addr_ptr) (int, CORE_ADDR))
673 deprecated_set_gdbarch_data (gdbarch, register_addr_data, register_addr_ptr);
677 init_register_addr_data (struct gdbarch *gdbarch)
682 /* Check the code at PC for a dynamic linker lazy resolution stub. Because
683 they aren't in the .plt section, we pattern-match on the code generated
684 by GNU ld. They look like this:
691 (with the appropriate doubleword instructions for N64). Also return the
692 dynamic symbol index used in the last instruction. */
695 mips_linux_in_dynsym_stub (CORE_ADDR pc, char *name)
697 unsigned char buf[28], *p;
698 ULONGEST insn, insn1;
699 int n64 = (mips_abi (current_gdbarch) == MIPS_ABI_N64);
701 read_memory (pc - 12, buf, 28);
705 /* ld t9,0x8010(gp) */
710 /* lw t9,0x8010(gp) */
717 insn = extract_unsigned_integer (p, 4);
725 insn = extract_unsigned_integer (p + 4, 4);
729 if (insn != 0x03e0782d)
735 if (insn != 0x03e07821)
739 insn = extract_unsigned_integer (p + 8, 4);
741 if (insn != 0x0320f809)
744 insn = extract_unsigned_integer (p + 12, 4);
747 /* daddiu t8,zero,0 */
748 if ((insn & 0xffff0000) != 0x64180000)
753 /* addiu t8,zero,0 */
754 if ((insn & 0xffff0000) != 0x24180000)
758 return (insn & 0xffff);
761 /* Return non-zero iff PC belongs to the dynamic linker resolution code
765 mips_linux_in_dynsym_resolve_code (CORE_ADDR pc)
767 /* Check whether PC is in the dynamic linker. This also checks whether
768 it is in the .plt section, which MIPS does not use. */
769 if (in_solib_dynsym_resolve_code (pc))
772 /* Pattern match for the stub. It would be nice if there were a more
773 efficient way to avoid this check. */
774 if (mips_linux_in_dynsym_stub (pc, NULL))
780 /* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c,
781 and glibc_skip_solib_resolver in glibc-tdep.c. The normal glibc
782 implementation of this triggers at "fixup" from the same objfile as
783 "_dl_runtime_resolve"; MIPS GNU/Linux can trigger at
784 "__dl_runtime_resolve" directly. An unresolved PLT entry will
785 point to _dl_runtime_resolve, which will first call
786 __dl_runtime_resolve, and then pass control to the resolved
790 mips_linux_skip_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
792 struct minimal_symbol *resolver;
794 resolver = lookup_minimal_symbol ("__dl_runtime_resolve", NULL, NULL);
796 if (resolver && SYMBOL_VALUE_ADDRESS (resolver) == pc)
797 return frame_pc_unwind (get_current_frame ());
802 /* Signal trampoline support. There are four supported layouts for a
803 signal frame: o32 sigframe, o32 rt_sigframe, n32 rt_sigframe, and
804 n64 rt_sigframe. We handle them all independently; not the most
805 efficient way, but simplest. First, declare all the unwinders. */
807 static void mips_linux_o32_sigframe_init (const struct tramp_frame *self,
808 struct frame_info *next_frame,
809 struct trad_frame_cache *this_cache,
812 static void mips_linux_n32n64_sigframe_init (const struct tramp_frame *self,
813 struct frame_info *next_frame,
814 struct trad_frame_cache *this_cache,
817 #define MIPS_NR_LINUX 4000
818 #define MIPS_NR_N64_LINUX 5000
819 #define MIPS_NR_N32_LINUX 6000
821 #define MIPS_NR_sigreturn MIPS_NR_LINUX + 119
822 #define MIPS_NR_rt_sigreturn MIPS_NR_LINUX + 193
823 #define MIPS_NR_N64_rt_sigreturn MIPS_NR_N64_LINUX + 211
824 #define MIPS_NR_N32_rt_sigreturn MIPS_NR_N32_LINUX + 211
826 #define MIPS_INST_LI_V0_SIGRETURN 0x24020000 + MIPS_NR_sigreturn
827 #define MIPS_INST_LI_V0_RT_SIGRETURN 0x24020000 + MIPS_NR_rt_sigreturn
828 #define MIPS_INST_LI_V0_N64_RT_SIGRETURN 0x24020000 + MIPS_NR_N64_rt_sigreturn
829 #define MIPS_INST_LI_V0_N32_RT_SIGRETURN 0x24020000 + MIPS_NR_N32_rt_sigreturn
830 #define MIPS_INST_SYSCALL 0x0000000c
832 struct tramp_frame mips_linux_o32_sigframe = {
834 { MIPS_INST_LI_V0_SIGRETURN, MIPS_INST_SYSCALL, TRAMP_SENTINEL_INSN },
835 mips_linux_o32_sigframe_init
838 struct tramp_frame mips_linux_o32_rt_sigframe = {
840 { MIPS_INST_LI_V0_RT_SIGRETURN, MIPS_INST_SYSCALL, TRAMP_SENTINEL_INSN },
841 mips_linux_o32_sigframe_init
844 struct tramp_frame mips_linux_n32_rt_sigframe = {
846 { MIPS_INST_LI_V0_N32_RT_SIGRETURN, MIPS_INST_SYSCALL, TRAMP_SENTINEL_INSN },
847 mips_linux_n32n64_sigframe_init
850 struct tramp_frame mips_linux_n64_rt_sigframe = {
852 { MIPS_INST_LI_V0_N64_RT_SIGRETURN, MIPS_INST_SYSCALL, TRAMP_SENTINEL_INSN },
853 mips_linux_n32n64_sigframe_init
857 /* The unwinder for o32 signal frames. The legacy structures look
861 u32 sf_ass[4]; [argument save space for o32]
862 u32 sf_code[2]; [signal trampoline]
863 struct sigcontext sf_sc;
868 unsigned int sc_regmask; [Unused]
869 unsigned int sc_status;
870 unsigned long long sc_pc;
871 unsigned long long sc_regs[32];
872 unsigned long long sc_fpregs[32];
873 unsigned int sc_ownedfp;
874 unsigned int sc_fpc_csr;
875 unsigned int sc_fpc_eir; [Unused]
876 unsigned int sc_used_math;
877 unsigned int sc_ssflags; [Unused]
878 [Alignment hole of four bytes]
879 unsigned long long sc_mdhi;
880 unsigned long long sc_mdlo;
882 unsigned int sc_cause; [Unused]
883 unsigned int sc_badvaddr; [Unused]
885 unsigned long sc_sigset[4]; [kernel's sigset_t]
888 The RT signal frames look like this:
891 u32 rs_ass[4]; [argument save space for o32]
892 u32 rs_code[2] [signal trampoline]
893 struct siginfo rs_info;
894 struct ucontext rs_uc;
898 unsigned long uc_flags;
899 struct ucontext *uc_link;
901 [Alignment hole of four bytes]
902 struct sigcontext uc_mcontext;
907 #define SIGFRAME_CODE_OFFSET (4 * 4)
908 #define SIGFRAME_SIGCONTEXT_OFFSET (6 * 4)
910 #define RTSIGFRAME_SIGINFO_SIZE 128
911 #define STACK_T_SIZE (3 * 4)
912 #define UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + STACK_T_SIZE + 4)
913 #define RTSIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \
914 + RTSIGFRAME_SIGINFO_SIZE \
915 + UCONTEXT_SIGCONTEXT_OFFSET)
917 #define SIGCONTEXT_PC (1 * 8)
918 #define SIGCONTEXT_REGS (2 * 8)
919 #define SIGCONTEXT_FPREGS (34 * 8)
920 #define SIGCONTEXT_FPCSR (66 * 8 + 4)
921 #define SIGCONTEXT_HI (69 * 8)
922 #define SIGCONTEXT_LO (70 * 8)
923 #define SIGCONTEXT_CAUSE (71 * 8 + 0)
924 #define SIGCONTEXT_BADVADDR (71 * 8 + 4)
926 #define SIGCONTEXT_REG_SIZE 8
929 mips_linux_o32_sigframe_init (const struct tramp_frame *self,
930 struct frame_info *next_frame,
931 struct trad_frame_cache *this_cache,
934 int ireg, reg_position;
935 CORE_ADDR sigcontext_base = func - SIGFRAME_CODE_OFFSET;
936 const struct mips_regnum *regs = mips_regnum (current_gdbarch);
938 if (self == &mips_linux_o32_sigframe)
939 sigcontext_base += SIGFRAME_SIGCONTEXT_OFFSET;
941 sigcontext_base += RTSIGFRAME_SIGCONTEXT_OFFSET;
943 /* I'm not proud of this hack. Eventually we will have the infrastructure
944 to indicate the size of saved registers on a per-frame basis, but
945 right now we don't; the kernel saves eight bytes but we only want
947 if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
948 sigcontext_base += 4;
951 trad_frame_set_reg_addr (this_cache, ORIG_ZERO_REGNUM + NUM_REGS,
952 sigcontext_base + SIGCONTEXT_REGS);
955 for (ireg = 1; ireg < 32; ireg++)
956 trad_frame_set_reg_addr (this_cache, ireg + ZERO_REGNUM + NUM_REGS,
957 sigcontext_base + SIGCONTEXT_REGS
958 + ireg * SIGCONTEXT_REG_SIZE);
960 for (ireg = 0; ireg < 32; ireg++)
961 trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + NUM_REGS,
962 sigcontext_base + SIGCONTEXT_FPREGS
963 + ireg * SIGCONTEXT_REG_SIZE);
965 trad_frame_set_reg_addr (this_cache, regs->pc + NUM_REGS,
966 sigcontext_base + SIGCONTEXT_PC);
968 trad_frame_set_reg_addr (this_cache, regs->fp_control_status + NUM_REGS,
969 sigcontext_base + SIGCONTEXT_FPCSR);
970 trad_frame_set_reg_addr (this_cache, regs->hi + NUM_REGS,
971 sigcontext_base + SIGCONTEXT_HI);
972 trad_frame_set_reg_addr (this_cache, regs->lo + NUM_REGS,
973 sigcontext_base + SIGCONTEXT_LO);
974 trad_frame_set_reg_addr (this_cache, regs->cause + NUM_REGS,
975 sigcontext_base + SIGCONTEXT_CAUSE);
976 trad_frame_set_reg_addr (this_cache, regs->badvaddr + NUM_REGS,
977 sigcontext_base + SIGCONTEXT_BADVADDR);
979 /* Choice of the bottom of the sigframe is somewhat arbitrary. */
980 trad_frame_set_id (this_cache,
981 frame_id_build (func - SIGFRAME_CODE_OFFSET, func));
985 /* For N32/N64 things look different. There is no non-rt signal frame.
987 struct rt_sigframe_n32 {
988 u32 rs_ass[4]; [ argument save space for o32 ]
989 u32 rs_code[2]; [ signal trampoline ]
990 struct siginfo rs_info;
991 struct ucontextn32 rs_uc;
998 struct sigcontext uc_mcontext;
999 sigset_t uc_sigmask; [ mask last for extensibility ]
1002 struct rt_sigframe_n32 {
1003 u32 rs_ass[4]; [ argument save space for o32 ]
1004 u32 rs_code[2]; [ signal trampoline ]
1005 struct siginfo rs_info;
1006 struct ucontext rs_uc;
1010 unsigned long uc_flags;
1011 struct ucontext *uc_link;
1013 struct sigcontext uc_mcontext;
1014 sigset_t uc_sigmask; [ mask last for extensibility ]
1017 And the sigcontext is different (this is for both n32 and n64):
1020 unsigned long long sc_regs[32];
1021 unsigned long long sc_fpregs[32];
1022 unsigned long long sc_mdhi;
1023 unsigned long long sc_mdlo;
1024 unsigned long long sc_pc;
1025 unsigned int sc_status;
1026 unsigned int sc_fpc_csr;
1027 unsigned int sc_fpc_eir;
1028 unsigned int sc_used_math;
1029 unsigned int sc_cause;
1030 unsigned int sc_badvaddr;
1034 #define N32_STACK_T_SIZE STACK_T_SIZE
1035 #define N64_STACK_T_SIZE (2 * 8 + 4)
1036 #define N32_UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + N32_STACK_T_SIZE + 4)
1037 #define N64_UCONTEXT_SIGCONTEXT_OFFSET (2 * 8 + N64_STACK_T_SIZE + 4)
1038 #define N32_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \
1039 + RTSIGFRAME_SIGINFO_SIZE \
1040 + N32_UCONTEXT_SIGCONTEXT_OFFSET)
1041 #define N64_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \
1042 + RTSIGFRAME_SIGINFO_SIZE \
1043 + N64_UCONTEXT_SIGCONTEXT_OFFSET)
1045 #define N64_SIGCONTEXT_REGS (0 * 8)
1046 #define N64_SIGCONTEXT_FPREGS (32 * 8)
1047 #define N64_SIGCONTEXT_HI (64 * 8)
1048 #define N64_SIGCONTEXT_LO (65 * 8)
1049 #define N64_SIGCONTEXT_PC (66 * 8)
1050 #define N64_SIGCONTEXT_FPCSR (67 * 8 + 1 * 4)
1051 #define N64_SIGCONTEXT_FIR (67 * 8 + 2 * 4)
1052 #define N64_SIGCONTEXT_CAUSE (67 * 8 + 4 * 4)
1053 #define N64_SIGCONTEXT_BADVADDR (67 * 8 + 5 * 4)
1055 #define N64_SIGCONTEXT_REG_SIZE 8
1058 mips_linux_n32n64_sigframe_init (const struct tramp_frame *self,
1059 struct frame_info *next_frame,
1060 struct trad_frame_cache *this_cache,
1063 int ireg, reg_position;
1064 CORE_ADDR sigcontext_base = func - SIGFRAME_CODE_OFFSET;
1065 const struct mips_regnum *regs = mips_regnum (current_gdbarch);
1067 if (self == &mips_linux_n32_rt_sigframe)
1068 sigcontext_base += N32_SIGFRAME_SIGCONTEXT_OFFSET;
1070 sigcontext_base += N64_SIGFRAME_SIGCONTEXT_OFFSET;
1073 trad_frame_set_reg_addr (this_cache, ORIG_ZERO_REGNUM + NUM_REGS,
1074 sigcontext_base + N64_SIGCONTEXT_REGS);
1077 for (ireg = 1; ireg < 32; ireg++)
1078 trad_frame_set_reg_addr (this_cache, ireg + ZERO_REGNUM + NUM_REGS,
1079 sigcontext_base + N64_SIGCONTEXT_REGS
1080 + ireg * N64_SIGCONTEXT_REG_SIZE);
1082 for (ireg = 0; ireg < 32; ireg++)
1083 trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + NUM_REGS,
1084 sigcontext_base + N64_SIGCONTEXT_FPREGS
1085 + ireg * N64_SIGCONTEXT_REG_SIZE);
1087 trad_frame_set_reg_addr (this_cache, regs->pc + NUM_REGS,
1088 sigcontext_base + N64_SIGCONTEXT_PC);
1090 trad_frame_set_reg_addr (this_cache, regs->fp_control_status + NUM_REGS,
1091 sigcontext_base + N64_SIGCONTEXT_FPCSR);
1092 trad_frame_set_reg_addr (this_cache, regs->hi + NUM_REGS,
1093 sigcontext_base + N64_SIGCONTEXT_HI);
1094 trad_frame_set_reg_addr (this_cache, regs->lo + NUM_REGS,
1095 sigcontext_base + N64_SIGCONTEXT_LO);
1096 trad_frame_set_reg_addr (this_cache, regs->cause + NUM_REGS,
1097 sigcontext_base + N64_SIGCONTEXT_CAUSE);
1098 trad_frame_set_reg_addr (this_cache, regs->badvaddr + NUM_REGS,
1099 sigcontext_base + N64_SIGCONTEXT_BADVADDR);
1101 /* Choice of the bottom of the sigframe is somewhat arbitrary. */
1102 trad_frame_set_id (this_cache,
1103 frame_id_build (func - SIGFRAME_CODE_OFFSET, func));
1106 /* Initialize one of the GNU/Linux OS ABIs. */
1109 mips_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
1111 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1112 enum mips_abi abi = mips_abi (gdbarch);
1117 set_gdbarch_get_longjmp_target (gdbarch,
1118 mips_linux_get_longjmp_target);
1119 set_solib_svr4_fetch_link_map_offsets
1120 (gdbarch, mips_linux_svr4_fetch_link_map_offsets);
1121 set_mips_linux_register_addr (gdbarch, mips_linux_register_addr);
1122 tramp_frame_prepend_unwinder (gdbarch, &mips_linux_o32_sigframe);
1123 tramp_frame_prepend_unwinder (gdbarch, &mips_linux_o32_rt_sigframe);
1126 set_gdbarch_get_longjmp_target (gdbarch,
1127 mips_linux_get_longjmp_target);
1128 set_solib_svr4_fetch_link_map_offsets
1129 (gdbarch, mips_linux_svr4_fetch_link_map_offsets);
1130 set_mips_linux_register_addr (gdbarch, mips64_linux_register_addr);
1131 tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n32_rt_sigframe);
1134 set_gdbarch_get_longjmp_target (gdbarch,
1135 mips64_linux_get_longjmp_target);
1136 set_solib_svr4_fetch_link_map_offsets
1137 (gdbarch, mips64_linux_svr4_fetch_link_map_offsets);
1138 set_mips_linux_register_addr (gdbarch, mips64_linux_register_addr);
1139 tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n64_rt_sigframe);
1142 internal_error (__FILE__, __LINE__, "can't handle ABI");
1146 set_gdbarch_skip_solib_resolver (gdbarch, mips_linux_skip_resolver);
1148 /* This overrides the MIPS16 stub support from mips-tdep. But no
1149 one uses MIPS16 on GNU/Linux yet, so this isn't much of a loss. */
1150 set_gdbarch_in_solib_call_trampoline (gdbarch, mips_linux_in_dynsym_stub);
1154 _initialize_mips_linux_tdep (void)
1156 const struct bfd_arch_info *arch_info;
1158 register_addr_data =
1159 gdbarch_data_register_post_init (init_register_addr_data);
1161 for (arch_info = bfd_lookup_arch (bfd_arch_mips, 0);
1163 arch_info = arch_info->next)
1165 gdbarch_register_osabi (bfd_arch_mips, arch_info->mach, GDB_OSABI_LINUX,
1166 mips_linux_init_abi);
1169 add_core_fns (®set_core_fns);