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_isa_regsize() is
96 supply_32bit_reg (int regnum, const void *addr)
98 char buf[MAX_REGISTER_SIZE];
99 store_signed_integer (buf, DEPRECATED_REGISTER_RAW_SIZE (regnum),
100 extract_signed_integer (addr, 4));
101 supply_register (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 supply_register (UNUSED_REGNUM, zerobuf);
133 for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
134 supply_register (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_collect (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_collect (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 supply_register (FP0_REGNUM + regi,
202 (char *)(*fpregsetp + regi));
204 supply_register (mips_regnum (current_gdbarch)->fp_control_status,
205 (char *)(*fpregsetp + 32));
207 /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */
208 supply_register (mips_regnum (current_gdbarch)->fp_implementation_revision,
212 /* Likewise, pack one or all floating point registers into an
216 fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
220 if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
222 from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
223 to = (char *) (*fpregsetp + regno - FP0_REGNUM);
224 memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno - FP0_REGNUM));
226 else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
228 from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
229 to = (char *) (*fpregsetp + 32);
230 memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno));
232 else if (regno == -1)
236 for (regi = 0; regi < 32; regi++)
237 fill_fpregset (fpregsetp, FP0_REGNUM + regi);
238 fill_fpregset(fpregsetp, mips_regnum (current_gdbarch)->fp_control_status);
242 /* Map gdb internal register number to ptrace ``address''.
243 These ``addresses'' are normally defined in <asm/ptrace.h>. */
246 mips_linux_register_addr (int regno, CORE_ADDR blockend)
250 if (regno < 0 || regno >= NUM_REGS)
251 error ("Bogon register number %d.", regno);
255 else if ((regno >= mips_regnum (current_gdbarch)->fp0)
256 && (regno < mips_regnum (current_gdbarch)->fp0 + 32))
257 regaddr = FPR_BASE + (regno - mips_regnum (current_gdbarch)->fp0);
258 else if (regno == mips_regnum (current_gdbarch)->pc)
260 else if (regno == mips_regnum (current_gdbarch)->cause)
262 else if (regno == mips_regnum (current_gdbarch)->badvaddr)
264 else if (regno == mips_regnum (current_gdbarch)->lo)
266 else if (regno == mips_regnum (current_gdbarch)->hi)
268 else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
270 else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
273 error ("Unknowable register number %d.", regno);
279 /* Fetch (and possibly build) an appropriate link_map_offsets
280 structure for native GNU/Linux MIPS targets using the struct offsets
281 defined in link.h (but without actual reference to that file).
283 This makes it possible to access GNU/Linux MIPS shared libraries from a
284 GDB that was built on a different host platform (for cross debugging). */
286 static struct link_map_offsets *
287 mips_linux_svr4_fetch_link_map_offsets (void)
289 static struct link_map_offsets lmo;
290 static struct link_map_offsets *lmp = NULL;
296 lmo.r_debug_size = 8; /* The actual size is 20 bytes, but
297 this is all we need. */
298 lmo.r_map_offset = 4;
301 lmo.link_map_size = 20;
303 lmo.l_addr_offset = 0;
306 lmo.l_name_offset = 4;
309 lmo.l_next_offset = 12;
312 lmo.l_prev_offset = 16;
319 /* Support for 64-bit ABIs. */
321 /* Copied from <asm/elf.h>. */
322 #define MIPS64_ELF_NGREG 45
323 #define MIPS64_ELF_NFPREG 33
325 typedef unsigned char mips64_elf_greg_t[8];
326 typedef mips64_elf_greg_t mips64_elf_gregset_t[MIPS64_ELF_NGREG];
328 typedef unsigned char mips64_elf_fpreg_t[8];
329 typedef mips64_elf_fpreg_t mips64_elf_fpregset_t[MIPS64_ELF_NFPREG];
331 /* 0 - 31 are integer registers, 32 - 63 are fp registers. */
332 #define MIPS64_FPR_BASE 32
334 #define MIPS64_CAUSE 65
335 #define MIPS64_BADVADDR 66
336 #define MIPS64_MMHI 67
337 #define MIPS64_MMLO 68
338 #define MIPS64_FPC_CSR 69
339 #define MIPS64_FPC_EIR 70
341 #define MIPS64_EF_REG0 0
342 #define MIPS64_EF_REG31 31
343 #define MIPS64_EF_LO 32
344 #define MIPS64_EF_HI 33
345 #define MIPS64_EF_CP0_EPC 34
346 #define MIPS64_EF_CP0_BADVADDR 35
347 #define MIPS64_EF_CP0_STATUS 36
348 #define MIPS64_EF_CP0_CAUSE 37
350 #define MIPS64_EF_SIZE 304
352 /* Figure out where the longjmp will land.
353 We expect the first arg to be a pointer to the jmp_buf structure from
354 which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
355 is copied into PC. This routine returns 1 on success. */
357 /* Details about jmp_buf. */
359 #define MIPS64_LINUX_JB_PC 0
362 mips64_linux_get_longjmp_target (CORE_ADDR *pc)
365 void *buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
366 int element_size = TARGET_PTR_BIT == 32 ? 4 : 8;
368 jb_addr = read_register (A0_REGNUM);
370 if (target_read_memory (jb_addr + MIPS64_LINUX_JB_PC * element_size,
371 buf, TARGET_PTR_BIT / TARGET_CHAR_BIT))
374 *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
379 /* Unpack an elf_gregset_t into GDB's register cache. */
382 mips64_supply_gregset (mips64_elf_gregset_t *gregsetp)
385 mips64_elf_greg_t *regp = *gregsetp;
386 char zerobuf[MAX_REGISTER_SIZE];
388 memset (zerobuf, 0, MAX_REGISTER_SIZE);
390 for (regi = MIPS64_EF_REG0; regi <= MIPS64_EF_REG31; regi++)
391 supply_register ((regi - MIPS64_EF_REG0), (char *)(regp + regi));
393 supply_register (mips_regnum (current_gdbarch)->lo,
394 (char *)(regp + MIPS64_EF_LO));
395 supply_register (mips_regnum (current_gdbarch)->hi,
396 (char *)(regp + MIPS64_EF_HI));
398 supply_register (mips_regnum (current_gdbarch)->pc,
399 (char *)(regp + MIPS64_EF_CP0_EPC));
400 supply_register (mips_regnum (current_gdbarch)->badvaddr,
401 (char *)(regp + MIPS64_EF_CP0_BADVADDR));
402 supply_register (PS_REGNUM, (char *)(regp + MIPS64_EF_CP0_STATUS));
403 supply_register (mips_regnum (current_gdbarch)->cause,
404 (char *)(regp + MIPS64_EF_CP0_CAUSE));
406 /* Fill inaccessible registers with zero. */
407 supply_register (UNUSED_REGNUM, zerobuf);
408 for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
409 supply_register (regi, zerobuf);
412 /* Pack our registers (or one register) into an elf_gregset_t. */
415 mips64_fill_gregset (mips64_elf_gregset_t *gregsetp, int regno)
418 mips64_elf_greg_t *regp = *gregsetp;
423 memset (regp, 0, sizeof (mips64_elf_gregset_t));
424 for (regi = 0; regi < 32; regi++)
425 mips64_fill_gregset (gregsetp, regi);
426 mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->lo);
427 mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->hi);
428 mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->pc);
429 mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->badvaddr);
430 mips64_fill_gregset (gregsetp, PS_REGNUM);
431 mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->cause);
438 dst = regp + regno + MIPS64_EF_REG0;
439 regcache_collect (regno, dst);
443 if (regno == mips_regnum (current_gdbarch)->lo)
444 regaddr = MIPS64_EF_LO;
445 else if (regno == mips_regnum (current_gdbarch)->hi)
446 regaddr = MIPS64_EF_HI;
447 else if (regno == mips_regnum (current_gdbarch)->pc)
448 regaddr = MIPS64_EF_CP0_EPC;
449 else if (regno == mips_regnum (current_gdbarch)->badvaddr)
450 regaddr = MIPS64_EF_CP0_BADVADDR;
451 else if (regno == PS_REGNUM)
452 regaddr = MIPS64_EF_CP0_STATUS;
453 else if (regno == mips_regnum (current_gdbarch)->cause)
454 regaddr = MIPS64_EF_CP0_CAUSE;
460 dst = regp + regaddr;
461 regcache_collect (regno, dst);
465 /* Likewise, unpack an elf_fpregset_t. */
468 mips64_supply_fpregset (mips64_elf_fpregset_t *fpregsetp)
471 char zerobuf[MAX_REGISTER_SIZE];
473 memset (zerobuf, 0, MAX_REGISTER_SIZE);
475 for (regi = 0; regi < 32; regi++)
476 supply_register (FP0_REGNUM + regi,
477 (char *)(*fpregsetp + regi));
479 supply_register (mips_regnum (current_gdbarch)->fp_control_status,
480 (char *)(*fpregsetp + 32));
482 /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */
483 supply_register (mips_regnum (current_gdbarch)->fp_implementation_revision,
487 /* Likewise, pack one or all floating point registers into an
491 mips64_fill_fpregset (mips64_elf_fpregset_t *fpregsetp, int regno)
495 if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
497 from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
498 to = (char *) (*fpregsetp + regno - FP0_REGNUM);
499 memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno - FP0_REGNUM));
501 else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
503 from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
504 to = (char *) (*fpregsetp + 32);
505 memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno));
507 else if (regno == -1)
511 for (regi = 0; regi < 32; regi++)
512 mips64_fill_fpregset (fpregsetp, FP0_REGNUM + regi);
513 mips64_fill_fpregset(fpregsetp,
514 mips_regnum (current_gdbarch)->fp_control_status);
519 /* Map gdb internal register number to ptrace ``address''.
520 These ``addresses'' are normally defined in <asm/ptrace.h>. */
523 mips64_linux_register_addr (int regno, CORE_ADDR blockend)
527 if (regno < 0 || regno >= NUM_REGS)
528 error ("Bogon register number %d.", regno);
532 else if ((regno >= mips_regnum (current_gdbarch)->fp0)
533 && (regno < mips_regnum (current_gdbarch)->fp0 + 32))
534 regaddr = MIPS64_FPR_BASE + (regno - FP0_REGNUM);
535 else if (regno == mips_regnum (current_gdbarch)->pc)
537 else if (regno == mips_regnum (current_gdbarch)->cause)
538 regaddr = MIPS64_CAUSE;
539 else if (regno == mips_regnum (current_gdbarch)->badvaddr)
540 regaddr = MIPS64_BADVADDR;
541 else if (regno == mips_regnum (current_gdbarch)->lo)
542 regaddr = MIPS64_MMLO;
543 else if (regno == mips_regnum (current_gdbarch)->hi)
544 regaddr = MIPS64_MMHI;
545 else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
546 regaddr = MIPS64_FPC_CSR;
547 else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
548 regaddr = MIPS64_FPC_EIR;
550 error ("Unknowable register number %d.", regno);
555 /* Use a local version of this function to get the correct types for
556 regsets, until multi-arch core support is ready. */
559 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
560 int which, CORE_ADDR reg_addr)
562 elf_gregset_t gregset;
563 elf_fpregset_t fpregset;
564 mips64_elf_gregset_t gregset64;
565 mips64_elf_fpregset_t fpregset64;
569 if (core_reg_size == sizeof (gregset))
571 memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
572 supply_gregset (&gregset);
574 else if (core_reg_size == sizeof (gregset64))
576 memcpy ((char *) &gregset64, core_reg_sect, sizeof (gregset64));
577 mips64_supply_gregset (&gregset64);
581 warning ("wrong size gregset struct in core file");
586 if (core_reg_size == sizeof (fpregset))
588 memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
589 supply_fpregset (&fpregset);
591 else if (core_reg_size == sizeof (fpregset64))
593 memcpy ((char *) &fpregset64, core_reg_sect, sizeof (fpregset64));
594 mips64_supply_fpregset (&fpregset64);
598 warning ("wrong size fpregset struct in core file");
603 /* Register that we are able to handle ELF file formats using standard
604 procfs "regset" structures. */
606 static struct core_fns regset_core_fns =
608 bfd_target_elf_flavour, /* core_flavour */
609 default_check_format, /* check_format */
610 default_core_sniffer, /* core_sniffer */
611 fetch_core_registers, /* core_read_registers */
615 /* Fetch (and possibly build) an appropriate link_map_offsets
616 structure for native GNU/Linux MIPS targets using the struct offsets
617 defined in link.h (but without actual reference to that file).
619 This makes it possible to access GNU/Linux MIPS shared libraries from a
620 GDB that was built on a different host platform (for cross debugging). */
622 static struct link_map_offsets *
623 mips64_linux_svr4_fetch_link_map_offsets (void)
625 static struct link_map_offsets lmo;
626 static struct link_map_offsets *lmp = NULL;
632 lmo.r_debug_size = 16; /* The actual size is 40 bytes, but
633 this is all we need. */
634 lmo.r_map_offset = 8;
637 lmo.link_map_size = 40;
639 lmo.l_addr_offset = 0;
642 lmo.l_name_offset = 8;
645 lmo.l_next_offset = 24;
648 lmo.l_prev_offset = 32;
655 /* Handle for obtaining pointer to the current register_addr() function
656 for a given architecture. */
657 static struct gdbarch_data *register_addr_data;
660 register_addr (int regno, CORE_ADDR blockend)
662 CORE_ADDR (*register_addr_ptr) (int, CORE_ADDR) =
663 gdbarch_data (current_gdbarch, register_addr_data);
665 gdb_assert (register_addr_ptr != 0);
667 return register_addr_ptr (regno, blockend);
671 set_mips_linux_register_addr (struct gdbarch *gdbarch,
672 CORE_ADDR (*register_addr_ptr) (int, CORE_ADDR))
674 deprecated_set_gdbarch_data (gdbarch, register_addr_data, register_addr_ptr);
678 init_register_addr_data (struct gdbarch *gdbarch)
683 /* Check the code at PC for a dynamic linker lazy resolution stub. Because
684 they aren't in the .plt section, we pattern-match on the code generated
685 by GNU ld. They look like this:
692 (with the appropriate doubleword instructions for N64). Also return the
693 dynamic symbol index used in the last instruction. */
696 mips_linux_in_dynsym_stub (CORE_ADDR pc, char *name)
698 unsigned char buf[28], *p;
699 ULONGEST insn, insn1;
700 int n64 = (mips_abi (current_gdbarch) == MIPS_ABI_N64);
702 read_memory (pc - 12, buf, 28);
706 /* ld t9,0x8010(gp) */
711 /* lw t9,0x8010(gp) */
718 insn = extract_unsigned_integer (p, 4);
726 insn = extract_unsigned_integer (p + 4, 4);
730 if (insn != 0x03e0782d)
736 if (insn != 0x03e07821)
740 insn = extract_unsigned_integer (p + 8, 4);
742 if (insn != 0x0320f809)
745 insn = extract_unsigned_integer (p + 12, 4);
748 /* daddiu t8,zero,0 */
749 if ((insn & 0xffff0000) != 0x64180000)
754 /* addiu t8,zero,0 */
755 if ((insn & 0xffff0000) != 0x24180000)
759 return (insn & 0xffff);
762 /* Return non-zero iff PC belongs to the dynamic linker resolution code
766 mips_linux_in_dynsym_resolve_code (CORE_ADDR pc)
768 /* Check whether PC is in the dynamic linker. This also checks whether
769 it is in the .plt section, which MIPS does not use. */
770 if (in_solib_dynsym_resolve_code (pc))
773 /* Pattern match for the stub. It would be nice if there were a more
774 efficient way to avoid this check. */
775 if (mips_linux_in_dynsym_stub (pc, NULL))
781 /* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c,
782 and glibc_skip_solib_resolver in glibc-tdep.c. The normal glibc
783 implementation of this triggers at "fixup" from the same objfile as
784 "_dl_runtime_resolve"; MIPS GNU/Linux can trigger at
785 "__dl_runtime_resolve" directly. An unresolved PLT entry will
786 point to _dl_runtime_resolve, which will first call
787 __dl_runtime_resolve, and then pass control to the resolved
791 mips_linux_skip_resolver (struct gdbarch *gdbarch, CORE_ADDR pc)
793 struct minimal_symbol *resolver;
795 resolver = lookup_minimal_symbol ("__dl_runtime_resolve", NULL, NULL);
797 if (resolver && SYMBOL_VALUE_ADDRESS (resolver) == pc)
798 return frame_pc_unwind (get_current_frame ());
803 /* Signal trampoline support. There are four supported layouts for a
804 signal frame: o32 sigframe, o32 rt_sigframe, n32 rt_sigframe, and
805 n64 rt_sigframe. We handle them all independently; not the most
806 efficient way, but simplest. First, declare all the unwinders. */
808 static void mips_linux_o32_sigframe_init (const struct tramp_frame *self,
809 struct frame_info *next_frame,
810 struct trad_frame_cache *this_cache,
813 static void mips_linux_n32n64_sigframe_init (const struct tramp_frame *self,
814 struct frame_info *next_frame,
815 struct trad_frame_cache *this_cache,
818 #define MIPS_NR_LINUX 4000
819 #define MIPS_NR_N64_LINUX 5000
820 #define MIPS_NR_N32_LINUX 6000
822 #define MIPS_NR_sigreturn MIPS_NR_LINUX + 119
823 #define MIPS_NR_rt_sigreturn MIPS_NR_LINUX + 193
824 #define MIPS_NR_N64_rt_sigreturn MIPS_NR_N64_LINUX + 211
825 #define MIPS_NR_N32_rt_sigreturn MIPS_NR_N32_LINUX + 211
827 #define MIPS_INST_LI_V0_SIGRETURN 0x24020000 + MIPS_NR_sigreturn
828 #define MIPS_INST_LI_V0_RT_SIGRETURN 0x24020000 + MIPS_NR_rt_sigreturn
829 #define MIPS_INST_LI_V0_N64_RT_SIGRETURN 0x24020000 + MIPS_NR_N64_rt_sigreturn
830 #define MIPS_INST_LI_V0_N32_RT_SIGRETURN 0x24020000 + MIPS_NR_N32_rt_sigreturn
831 #define MIPS_INST_SYSCALL 0x0000000c
833 static const struct tramp_frame mips_linux_o32_sigframe = {
837 { MIPS_INST_LI_V0_SIGRETURN, -1 },
838 { MIPS_INST_SYSCALL, -1 },
839 { TRAMP_SENTINEL_INSN, -1 }
841 mips_linux_o32_sigframe_init
844 static const struct tramp_frame mips_linux_o32_rt_sigframe = {
848 { MIPS_INST_LI_V0_RT_SIGRETURN, -1 },
849 { MIPS_INST_SYSCALL, -1 },
850 { TRAMP_SENTINEL_INSN, -1 } },
851 mips_linux_o32_sigframe_init
854 static const struct tramp_frame mips_linux_n32_rt_sigframe = {
858 { MIPS_INST_LI_V0_N32_RT_SIGRETURN, -1 },
859 { MIPS_INST_SYSCALL, -1 },
860 { TRAMP_SENTINEL_INSN, -1 }
862 mips_linux_n32n64_sigframe_init
865 static const struct tramp_frame mips_linux_n64_rt_sigframe = {
868 { MIPS_INST_LI_V0_N64_RT_SIGRETURN, MIPS_INST_SYSCALL, TRAMP_SENTINEL_INSN },
869 mips_linux_n32n64_sigframe_init
873 /* The unwinder for o32 signal frames. The legacy structures look
877 u32 sf_ass[4]; [argument save space for o32]
878 u32 sf_code[2]; [signal trampoline]
879 struct sigcontext sf_sc;
884 unsigned int sc_regmask; [Unused]
885 unsigned int sc_status;
886 unsigned long long sc_pc;
887 unsigned long long sc_regs[32];
888 unsigned long long sc_fpregs[32];
889 unsigned int sc_ownedfp;
890 unsigned int sc_fpc_csr;
891 unsigned int sc_fpc_eir; [Unused]
892 unsigned int sc_used_math;
893 unsigned int sc_ssflags; [Unused]
894 [Alignment hole of four bytes]
895 unsigned long long sc_mdhi;
896 unsigned long long sc_mdlo;
898 unsigned int sc_cause; [Unused]
899 unsigned int sc_badvaddr; [Unused]
901 unsigned long sc_sigset[4]; [kernel's sigset_t]
904 The RT signal frames look like this:
907 u32 rs_ass[4]; [argument save space for o32]
908 u32 rs_code[2] [signal trampoline]
909 struct siginfo rs_info;
910 struct ucontext rs_uc;
914 unsigned long uc_flags;
915 struct ucontext *uc_link;
917 [Alignment hole of four bytes]
918 struct sigcontext uc_mcontext;
923 #define SIGFRAME_CODE_OFFSET (4 * 4)
924 #define SIGFRAME_SIGCONTEXT_OFFSET (6 * 4)
926 #define RTSIGFRAME_SIGINFO_SIZE 128
927 #define STACK_T_SIZE (3 * 4)
928 #define UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + STACK_T_SIZE + 4)
929 #define RTSIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \
930 + RTSIGFRAME_SIGINFO_SIZE \
931 + UCONTEXT_SIGCONTEXT_OFFSET)
933 #define SIGCONTEXT_PC (1 * 8)
934 #define SIGCONTEXT_REGS (2 * 8)
935 #define SIGCONTEXT_FPREGS (34 * 8)
936 #define SIGCONTEXT_FPCSR (66 * 8 + 4)
937 #define SIGCONTEXT_HI (69 * 8)
938 #define SIGCONTEXT_LO (70 * 8)
939 #define SIGCONTEXT_CAUSE (71 * 8 + 0)
940 #define SIGCONTEXT_BADVADDR (71 * 8 + 4)
942 #define SIGCONTEXT_REG_SIZE 8
945 mips_linux_o32_sigframe_init (const struct tramp_frame *self,
946 struct frame_info *next_frame,
947 struct trad_frame_cache *this_cache,
950 int ireg, reg_position;
951 CORE_ADDR sigcontext_base = func - SIGFRAME_CODE_OFFSET;
952 const struct mips_regnum *regs = mips_regnum (current_gdbarch);
954 if (self == &mips_linux_o32_sigframe)
955 sigcontext_base += SIGFRAME_SIGCONTEXT_OFFSET;
957 sigcontext_base += RTSIGFRAME_SIGCONTEXT_OFFSET;
959 /* I'm not proud of this hack. Eventually we will have the infrastructure
960 to indicate the size of saved registers on a per-frame basis, but
961 right now we don't; the kernel saves eight bytes but we only want
963 if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
964 sigcontext_base += 4;
967 trad_frame_set_reg_addr (this_cache, ORIG_ZERO_REGNUM + NUM_REGS,
968 sigcontext_base + SIGCONTEXT_REGS);
971 for (ireg = 1; ireg < 32; ireg++)
972 trad_frame_set_reg_addr (this_cache, ireg + ZERO_REGNUM + NUM_REGS,
973 sigcontext_base + SIGCONTEXT_REGS
974 + ireg * SIGCONTEXT_REG_SIZE);
976 for (ireg = 0; ireg < 32; ireg++)
977 trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + NUM_REGS,
978 sigcontext_base + SIGCONTEXT_FPREGS
979 + ireg * SIGCONTEXT_REG_SIZE);
981 trad_frame_set_reg_addr (this_cache, regs->pc + NUM_REGS,
982 sigcontext_base + SIGCONTEXT_PC);
984 trad_frame_set_reg_addr (this_cache, regs->fp_control_status + NUM_REGS,
985 sigcontext_base + SIGCONTEXT_FPCSR);
986 trad_frame_set_reg_addr (this_cache, regs->hi + NUM_REGS,
987 sigcontext_base + SIGCONTEXT_HI);
988 trad_frame_set_reg_addr (this_cache, regs->lo + NUM_REGS,
989 sigcontext_base + SIGCONTEXT_LO);
990 trad_frame_set_reg_addr (this_cache, regs->cause + NUM_REGS,
991 sigcontext_base + SIGCONTEXT_CAUSE);
992 trad_frame_set_reg_addr (this_cache, regs->badvaddr + NUM_REGS,
993 sigcontext_base + SIGCONTEXT_BADVADDR);
995 /* Choice of the bottom of the sigframe is somewhat arbitrary. */
996 trad_frame_set_id (this_cache,
997 frame_id_build (func - SIGFRAME_CODE_OFFSET, func));
1001 /* For N32/N64 things look different. There is no non-rt signal frame.
1003 struct rt_sigframe_n32 {
1004 u32 rs_ass[4]; [ argument save space for o32 ]
1005 u32 rs_code[2]; [ signal trampoline ]
1006 struct siginfo rs_info;
1007 struct ucontextn32 rs_uc;
1010 struct ucontextn32 {
1014 struct sigcontext uc_mcontext;
1015 sigset_t uc_sigmask; [ mask last for extensibility ]
1018 struct rt_sigframe_n32 {
1019 u32 rs_ass[4]; [ argument save space for o32 ]
1020 u32 rs_code[2]; [ signal trampoline ]
1021 struct siginfo rs_info;
1022 struct ucontext rs_uc;
1026 unsigned long uc_flags;
1027 struct ucontext *uc_link;
1029 struct sigcontext uc_mcontext;
1030 sigset_t uc_sigmask; [ mask last for extensibility ]
1033 And the sigcontext is different (this is for both n32 and n64):
1036 unsigned long long sc_regs[32];
1037 unsigned long long sc_fpregs[32];
1038 unsigned long long sc_mdhi;
1039 unsigned long long sc_mdlo;
1040 unsigned long long sc_pc;
1041 unsigned int sc_status;
1042 unsigned int sc_fpc_csr;
1043 unsigned int sc_fpc_eir;
1044 unsigned int sc_used_math;
1045 unsigned int sc_cause;
1046 unsigned int sc_badvaddr;
1050 #define N32_STACK_T_SIZE STACK_T_SIZE
1051 #define N64_STACK_T_SIZE (2 * 8 + 4)
1052 #define N32_UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + N32_STACK_T_SIZE + 4)
1053 #define N64_UCONTEXT_SIGCONTEXT_OFFSET (2 * 8 + N64_STACK_T_SIZE + 4)
1054 #define N32_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \
1055 + RTSIGFRAME_SIGINFO_SIZE \
1056 + N32_UCONTEXT_SIGCONTEXT_OFFSET)
1057 #define N64_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \
1058 + RTSIGFRAME_SIGINFO_SIZE \
1059 + N64_UCONTEXT_SIGCONTEXT_OFFSET)
1061 #define N64_SIGCONTEXT_REGS (0 * 8)
1062 #define N64_SIGCONTEXT_FPREGS (32 * 8)
1063 #define N64_SIGCONTEXT_HI (64 * 8)
1064 #define N64_SIGCONTEXT_LO (65 * 8)
1065 #define N64_SIGCONTEXT_PC (66 * 8)
1066 #define N64_SIGCONTEXT_FPCSR (67 * 8 + 1 * 4)
1067 #define N64_SIGCONTEXT_FIR (67 * 8 + 2 * 4)
1068 #define N64_SIGCONTEXT_CAUSE (67 * 8 + 4 * 4)
1069 #define N64_SIGCONTEXT_BADVADDR (67 * 8 + 5 * 4)
1071 #define N64_SIGCONTEXT_REG_SIZE 8
1074 mips_linux_n32n64_sigframe_init (const struct tramp_frame *self,
1075 struct frame_info *next_frame,
1076 struct trad_frame_cache *this_cache,
1079 int ireg, reg_position;
1080 CORE_ADDR sigcontext_base = func - SIGFRAME_CODE_OFFSET;
1081 const struct mips_regnum *regs = mips_regnum (current_gdbarch);
1083 if (self == &mips_linux_n32_rt_sigframe)
1084 sigcontext_base += N32_SIGFRAME_SIGCONTEXT_OFFSET;
1086 sigcontext_base += N64_SIGFRAME_SIGCONTEXT_OFFSET;
1089 trad_frame_set_reg_addr (this_cache, ORIG_ZERO_REGNUM + NUM_REGS,
1090 sigcontext_base + N64_SIGCONTEXT_REGS);
1093 for (ireg = 1; ireg < 32; ireg++)
1094 trad_frame_set_reg_addr (this_cache, ireg + ZERO_REGNUM + NUM_REGS,
1095 sigcontext_base + N64_SIGCONTEXT_REGS
1096 + ireg * N64_SIGCONTEXT_REG_SIZE);
1098 for (ireg = 0; ireg < 32; ireg++)
1099 trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + NUM_REGS,
1100 sigcontext_base + N64_SIGCONTEXT_FPREGS
1101 + ireg * N64_SIGCONTEXT_REG_SIZE);
1103 trad_frame_set_reg_addr (this_cache, regs->pc + NUM_REGS,
1104 sigcontext_base + N64_SIGCONTEXT_PC);
1106 trad_frame_set_reg_addr (this_cache, regs->fp_control_status + NUM_REGS,
1107 sigcontext_base + N64_SIGCONTEXT_FPCSR);
1108 trad_frame_set_reg_addr (this_cache, regs->hi + NUM_REGS,
1109 sigcontext_base + N64_SIGCONTEXT_HI);
1110 trad_frame_set_reg_addr (this_cache, regs->lo + NUM_REGS,
1111 sigcontext_base + N64_SIGCONTEXT_LO);
1112 trad_frame_set_reg_addr (this_cache, regs->cause + NUM_REGS,
1113 sigcontext_base + N64_SIGCONTEXT_CAUSE);
1114 trad_frame_set_reg_addr (this_cache, regs->badvaddr + NUM_REGS,
1115 sigcontext_base + N64_SIGCONTEXT_BADVADDR);
1117 /* Choice of the bottom of the sigframe is somewhat arbitrary. */
1118 trad_frame_set_id (this_cache,
1119 frame_id_build (func - SIGFRAME_CODE_OFFSET, func));
1122 /* Initialize one of the GNU/Linux OS ABIs. */
1125 mips_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
1127 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
1128 enum mips_abi abi = mips_abi (gdbarch);
1133 set_gdbarch_get_longjmp_target (gdbarch,
1134 mips_linux_get_longjmp_target);
1135 set_solib_svr4_fetch_link_map_offsets
1136 (gdbarch, mips_linux_svr4_fetch_link_map_offsets);
1137 set_mips_linux_register_addr (gdbarch, mips_linux_register_addr);
1138 tramp_frame_prepend_unwinder (gdbarch, &mips_linux_o32_sigframe);
1139 tramp_frame_prepend_unwinder (gdbarch, &mips_linux_o32_rt_sigframe);
1142 set_gdbarch_get_longjmp_target (gdbarch,
1143 mips_linux_get_longjmp_target);
1144 set_solib_svr4_fetch_link_map_offsets
1145 (gdbarch, mips_linux_svr4_fetch_link_map_offsets);
1146 set_mips_linux_register_addr (gdbarch, mips64_linux_register_addr);
1147 tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n32_rt_sigframe);
1150 set_gdbarch_get_longjmp_target (gdbarch,
1151 mips64_linux_get_longjmp_target);
1152 set_solib_svr4_fetch_link_map_offsets
1153 (gdbarch, mips64_linux_svr4_fetch_link_map_offsets);
1154 set_mips_linux_register_addr (gdbarch, mips64_linux_register_addr);
1155 tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n64_rt_sigframe);
1158 internal_error (__FILE__, __LINE__, "can't handle ABI");
1162 set_gdbarch_skip_solib_resolver (gdbarch, mips_linux_skip_resolver);
1164 /* This overrides the MIPS16 stub support from mips-tdep. But no
1165 one uses MIPS16 on GNU/Linux yet, so this isn't much of a loss. */
1166 set_gdbarch_in_solib_call_trampoline (gdbarch, mips_linux_in_dynsym_stub);
1170 _initialize_mips_linux_tdep (void)
1172 const struct bfd_arch_info *arch_info;
1174 register_addr_data =
1175 gdbarch_data_register_post_init (init_register_addr_data);
1177 for (arch_info = bfd_lookup_arch (bfd_arch_mips, 0);
1179 arch_info = arch_info->next)
1181 gdbarch_register_osabi (bfd_arch_mips, arch_info->mach, GDB_OSABI_LINUX,
1182 mips_linux_init_abi);
1185 deprecated_add_core_fns (®set_core_fns);