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Diffstat (limited to 'gdb/mips-linux-tdep.c')
| -rw-r--r-- | gdb/mips-linux-tdep.c | 1208 |
1 files changed, 0 insertions, 1208 deletions
diff --git a/gdb/mips-linux-tdep.c b/gdb/mips-linux-tdep.c deleted file mode 100644 index 5d789d2..0000000 --- a/gdb/mips-linux-tdep.c +++ /dev/null @@ -1,1208 +0,0 @@ -/* Target-dependent code for GNU/Linux on MIPS processors. - - Copyright (C) 2001, 2002, 2004, 2005, 2006 - Free Software Foundation, Inc. - - This file is part of GDB. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 51 Franklin Street, Fifth Floor, - Boston, MA 02110-1301, USA. */ - -#include "defs.h" -#include "gdbcore.h" -#include "target.h" -#include "solib-svr4.h" -#include "osabi.h" -#include "mips-tdep.h" -#include "gdb_string.h" -#include "gdb_assert.h" -#include "frame.h" -#include "regcache.h" -#include "trad-frame.h" -#include "tramp-frame.h" -#include "floatformat.h" -#include "mips-linux-tdep.h" - -/* Figure out where the longjmp will land. - We expect the first arg to be a pointer to the jmp_buf structure - from which we extract the pc (MIPS_LINUX_JB_PC) that we will land - at. The pc is copied into PC. This routine returns 1 on - success. */ - -#define MIPS_LINUX_JB_ELEMENT_SIZE 4 -#define MIPS_LINUX_JB_PC 0 - -static int -mips_linux_get_longjmp_target (CORE_ADDR *pc) -{ - CORE_ADDR jb_addr; - char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT]; - - jb_addr = read_register (MIPS_A0_REGNUM); - - if (target_read_memory (jb_addr - + MIPS_LINUX_JB_PC * MIPS_LINUX_JB_ELEMENT_SIZE, - buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) - return 0; - - *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); - - return 1; -} - -/* Transform the bits comprising a 32-bit register to the right size - for regcache_raw_supply(). This is needed when mips_isa_regsize() - is 8. */ - -static void -supply_32bit_reg (int regnum, const void *addr) -{ - gdb_byte buf[MAX_REGISTER_SIZE]; - store_signed_integer (buf, register_size (current_gdbarch, regnum), - extract_signed_integer (addr, 4)); - regcache_raw_supply (current_regcache, regnum, buf); -} - -/* Unpack an elf_gregset_t into GDB's register cache. */ - -void -mips_supply_gregset (mips_elf_gregset_t *gregsetp) -{ - int regi; - mips_elf_greg_t *regp = *gregsetp; - char zerobuf[MAX_REGISTER_SIZE]; - - memset (zerobuf, 0, MAX_REGISTER_SIZE); - - for (regi = EF_REG0; regi <= EF_REG31; regi++) - supply_32bit_reg ((regi - EF_REG0), (char *)(regp + regi)); - - supply_32bit_reg (mips_regnum (current_gdbarch)->lo, - (char *)(regp + EF_LO)); - supply_32bit_reg (mips_regnum (current_gdbarch)->hi, - (char *)(regp + EF_HI)); - - supply_32bit_reg (mips_regnum (current_gdbarch)->pc, - (char *)(regp + EF_CP0_EPC)); - supply_32bit_reg (mips_regnum (current_gdbarch)->badvaddr, - (char *)(regp + EF_CP0_BADVADDR)); - supply_32bit_reg (MIPS_PS_REGNUM, (char *)(regp + EF_CP0_STATUS)); - supply_32bit_reg (mips_regnum (current_gdbarch)->cause, - (char *)(regp + EF_CP0_CAUSE)); - - /* Fill inaccessible registers with zero. */ - regcache_raw_supply (current_regcache, MIPS_UNUSED_REGNUM, zerobuf); - for (regi = MIPS_FIRST_EMBED_REGNUM; - regi < MIPS_LAST_EMBED_REGNUM; - regi++) - regcache_raw_supply (current_regcache, regi, zerobuf); -} - -/* Pack our registers (or one register) into an elf_gregset_t. */ - -void -mips_fill_gregset (mips_elf_gregset_t *gregsetp, int regno) -{ - int regaddr, regi; - mips_elf_greg_t *regp = *gregsetp; - void *dst; - - if (regno == -1) - { - memset (regp, 0, sizeof (mips_elf_gregset_t)); - for (regi = 0; regi < 32; regi++) - mips_fill_gregset (gregsetp, regi); - mips_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->lo); - mips_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->hi); - mips_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->pc); - mips_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->badvaddr); - mips_fill_gregset (gregsetp, MIPS_PS_REGNUM); - mips_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->cause); - - return; - } - - if (regno < 32) - { - dst = regp + regno + EF_REG0; - regcache_raw_collect (current_regcache, regno, dst); - return; - } - - if (regno == mips_regnum (current_gdbarch)->lo) - regaddr = EF_LO; - else if (regno == mips_regnum (current_gdbarch)->hi) - regaddr = EF_HI; - else if (regno == mips_regnum (current_gdbarch)->pc) - regaddr = EF_CP0_EPC; - else if (regno == mips_regnum (current_gdbarch)->badvaddr) - regaddr = EF_CP0_BADVADDR; - else if (regno == MIPS_PS_REGNUM) - regaddr = EF_CP0_STATUS; - else if (regno == mips_regnum (current_gdbarch)->cause) - regaddr = EF_CP0_CAUSE; - else - regaddr = -1; - - if (regaddr != -1) - { - dst = regp + regaddr; - regcache_raw_collect (current_regcache, regno, dst); - } -} - -/* Likewise, unpack an elf_fpregset_t. */ - -void -mips_supply_fpregset (mips_elf_fpregset_t *fpregsetp) -{ - int regi; - char zerobuf[MAX_REGISTER_SIZE]; - - memset (zerobuf, 0, MAX_REGISTER_SIZE); - - for (regi = 0; regi < 32; regi++) - regcache_raw_supply (current_regcache, FP0_REGNUM + regi, - (char *)(*fpregsetp + regi)); - - regcache_raw_supply (current_regcache, - mips_regnum (current_gdbarch)->fp_control_status, - (char *)(*fpregsetp + 32)); - - /* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */ - regcache_raw_supply (current_regcache, - mips_regnum (current_gdbarch)->fp_implementation_revision, - zerobuf); -} - -/* Likewise, pack one or all floating point registers into an - elf_fpregset_t. */ - -void -mips_fill_fpregset (mips_elf_fpregset_t *fpregsetp, int regno) -{ - char *from, *to; - - if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32)) - { - to = (char *) (*fpregsetp + regno - FP0_REGNUM); - regcache_raw_collect (current_regcache, regno, to); - } - else if (regno == mips_regnum (current_gdbarch)->fp_control_status) - { - to = (char *) (*fpregsetp + 32); - regcache_raw_collect (current_regcache, regno, to); - } - else if (regno == -1) - { - int regi; - - for (regi = 0; regi < 32; regi++) - mips_fill_fpregset (fpregsetp, FP0_REGNUM + regi); - mips_fill_fpregset (fpregsetp, - mips_regnum (current_gdbarch)->fp_control_status); - } -} - -/* Map gdb internal register number to ptrace ``address''. - These ``addresses'' are normally defined in <asm/ptrace.h>. */ - -static CORE_ADDR -mips_linux_register_addr (int regno, CORE_ADDR blockend) -{ - int regaddr; - - if (regno < 0 || regno >= NUM_REGS) - error (_("Bogon register number %d."), regno); - - if (regno < 32) - regaddr = regno; - else if ((regno >= mips_regnum (current_gdbarch)->fp0) - && (regno < mips_regnum (current_gdbarch)->fp0 + 32)) - regaddr = FPR_BASE + (regno - mips_regnum (current_gdbarch)->fp0); - else if (regno == mips_regnum (current_gdbarch)->pc) - regaddr = PC; - else if (regno == mips_regnum (current_gdbarch)->cause) - regaddr = CAUSE; - else if (regno == mips_regnum (current_gdbarch)->badvaddr) - regaddr = BADVADDR; - else if (regno == mips_regnum (current_gdbarch)->lo) - regaddr = MMLO; - else if (regno == mips_regnum (current_gdbarch)->hi) - regaddr = MMHI; - else if (regno == mips_regnum (current_gdbarch)->fp_control_status) - regaddr = FPC_CSR; - else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision) - regaddr = FPC_EIR; - else - error (_("Unknowable register number %d."), regno); - - return regaddr; -} - -/* Support for 64-bit ABIs. */ - -/* Figure out where the longjmp will land. - We expect the first arg to be a pointer to the jmp_buf structure - from which we extract the pc (MIPS_LINUX_JB_PC) that we will land - at. The pc is copied into PC. This routine returns 1 on - success. */ - -/* Details about jmp_buf. */ - -#define MIPS64_LINUX_JB_PC 0 - -static int -mips64_linux_get_longjmp_target (CORE_ADDR *pc) -{ - CORE_ADDR jb_addr; - void *buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); - int element_size = TARGET_PTR_BIT == 32 ? 4 : 8; - - jb_addr = read_register (MIPS_A0_REGNUM); - - if (target_read_memory (jb_addr + MIPS64_LINUX_JB_PC * element_size, - buf, TARGET_PTR_BIT / TARGET_CHAR_BIT)) - return 0; - - *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); - - return 1; -} - -/* Register set support functions. These operate on standard 64-bit - regsets, but work whether the target is 32-bit or 64-bit. A 32-bit - target will still use the 64-bit format for PTRACE_GETREGS. */ - -/* Supply a 64-bit register. */ - -void -supply_64bit_reg (int regnum, const gdb_byte *buf) -{ - if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_BIG - && register_size (current_gdbarch, regnum) == 4) - regcache_raw_supply (current_regcache, regnum, buf + 4); - else - regcache_raw_supply (current_regcache, regnum, buf); -} - -/* Unpack a 64-bit elf_gregset_t into GDB's register cache. */ - -void -mips64_supply_gregset (mips64_elf_gregset_t *gregsetp) -{ - int regi; - mips64_elf_greg_t *regp = *gregsetp; - gdb_byte zerobuf[MAX_REGISTER_SIZE]; - - memset (zerobuf, 0, MAX_REGISTER_SIZE); - - for (regi = MIPS64_EF_REG0; regi <= MIPS64_EF_REG31; regi++) - supply_64bit_reg (regi - MIPS64_EF_REG0, (gdb_byte *)(regp + regi)); - - supply_64bit_reg (mips_regnum (current_gdbarch)->lo, - (gdb_byte *) (regp + MIPS64_EF_LO)); - supply_64bit_reg (mips_regnum (current_gdbarch)->hi, - (gdb_byte *) (regp + MIPS64_EF_HI)); - - supply_64bit_reg (mips_regnum (current_gdbarch)->pc, - (gdb_byte *) (regp + MIPS64_EF_CP0_EPC)); - supply_64bit_reg (mips_regnum (current_gdbarch)->badvaddr, - (gdb_byte *) (regp + MIPS64_EF_CP0_BADVADDR)); - supply_64bit_reg (MIPS_PS_REGNUM, - (gdb_byte *) (regp + MIPS64_EF_CP0_STATUS)); - supply_64bit_reg (mips_regnum (current_gdbarch)->cause, - (gdb_byte *) (regp + MIPS64_EF_CP0_CAUSE)); - - /* Fill inaccessible registers with zero. */ - regcache_raw_supply (current_regcache, MIPS_UNUSED_REGNUM, zerobuf); - for (regi = MIPS_FIRST_EMBED_REGNUM; - regi < MIPS_LAST_EMBED_REGNUM; - regi++) - regcache_raw_supply (current_regcache, regi, zerobuf); -} - -/* Pack our registers (or one register) into a 64-bit elf_gregset_t. */ - -void -mips64_fill_gregset (mips64_elf_gregset_t *gregsetp, int regno) -{ - int regaddr, regi; - mips64_elf_greg_t *regp = *gregsetp; - void *src, *dst; - - if (regno == -1) - { - memset (regp, 0, sizeof (mips64_elf_gregset_t)); - for (regi = 0; regi < 32; regi++) - mips64_fill_gregset (gregsetp, regi); - mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->lo); - mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->hi); - mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->pc); - mips64_fill_gregset (gregsetp, - mips_regnum (current_gdbarch)->badvaddr); - mips64_fill_gregset (gregsetp, MIPS_PS_REGNUM); - mips64_fill_gregset (gregsetp, - mips_regnum (current_gdbarch)->cause); - - return; - } - - if (regno < 32) - regaddr = regno + MIPS64_EF_REG0; - else if (regno == mips_regnum (current_gdbarch)->lo) - regaddr = MIPS64_EF_LO; - else if (regno == mips_regnum (current_gdbarch)->hi) - regaddr = MIPS64_EF_HI; - else if (regno == mips_regnum (current_gdbarch)->pc) - regaddr = MIPS64_EF_CP0_EPC; - else if (regno == mips_regnum (current_gdbarch)->badvaddr) - regaddr = MIPS64_EF_CP0_BADVADDR; - else if (regno == MIPS_PS_REGNUM) - regaddr = MIPS64_EF_CP0_STATUS; - else if (regno == mips_regnum (current_gdbarch)->cause) - regaddr = MIPS64_EF_CP0_CAUSE; - else - regaddr = -1; - - if (regaddr != -1) - { - gdb_byte buf[MAX_REGISTER_SIZE]; - LONGEST val; - - regcache_raw_collect (current_regcache, regno, buf); - val = extract_signed_integer (buf, - register_size (current_gdbarch, regno)); - dst = regp + regaddr; - store_signed_integer (dst, 8, val); - } -} - -/* Likewise, unpack an elf_fpregset_t. */ - -void -mips64_supply_fpregset (mips64_elf_fpregset_t *fpregsetp) -{ - int regi; - - /* See mips_linux_o32_sigframe_init for a description of the - peculiar FP register layout. */ - if (register_size (current_gdbarch, FP0_REGNUM) == 4) - for (regi = 0; regi < 32; regi++) - { - gdb_byte *reg_ptr = (gdb_byte *) (*fpregsetp + (regi & ~1)); - if ((TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) != (regi & 1)) - reg_ptr += 4; - regcache_raw_supply (current_regcache, FP0_REGNUM + regi, reg_ptr); - } - else - for (regi = 0; regi < 32; regi++) - regcache_raw_supply (current_regcache, FP0_REGNUM + regi, - (char *)(*fpregsetp + regi)); - - supply_32bit_reg (mips_regnum (current_gdbarch)->fp_control_status, - (gdb_byte *)(*fpregsetp + 32)); - - /* The ABI doesn't tell us how to supply FCRIR, and core dumps don't - include it - but the result of PTRACE_GETFPREGS does. The best we - can do is to assume that its value is present. */ - supply_32bit_reg (mips_regnum (current_gdbarch)->fp_implementation_revision, - (gdb_byte *)(*fpregsetp + 32) + 4); -} - -/* Likewise, pack one or all floating point registers into an - elf_fpregset_t. */ - -void -mips64_fill_fpregset (mips64_elf_fpregset_t *fpregsetp, int regno) -{ - gdb_byte *to; - - if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32)) - { - /* See mips_linux_o32_sigframe_init for a description of the - peculiar FP register layout. */ - if (register_size (current_gdbarch, regno) == 4) - { - int regi = regno - FP0_REGNUM; - - to = (gdb_byte *) (*fpregsetp + (regi & ~1)); - if ((TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) != (regi & 1)) - to += 4; - regcache_raw_collect (current_regcache, regno, to); - } - else - { - to = (gdb_byte *) (*fpregsetp + regno - FP0_REGNUM); - regcache_raw_collect (current_regcache, regno, to); - } - } - else if (regno == mips_regnum (current_gdbarch)->fp_control_status) - { - gdb_byte buf[MAX_REGISTER_SIZE]; - LONGEST val; - - regcache_raw_collect (current_regcache, regno, buf); - val = extract_signed_integer (buf, - register_size (current_gdbarch, regno)); - to = (gdb_byte *) (*fpregsetp + 32); - store_signed_integer (to, 4, val); - } - else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision) - { - gdb_byte buf[MAX_REGISTER_SIZE]; - LONGEST val; - - regcache_raw_collect (current_regcache, regno, buf); - val = extract_signed_integer (buf, - register_size (current_gdbarch, regno)); - to = (gdb_byte *) (*fpregsetp + 32) + 4; - store_signed_integer (to, 4, val); - } - else if (regno == -1) - { - int regi; - - for (regi = 0; regi < 32; regi++) - mips64_fill_fpregset (fpregsetp, FP0_REGNUM + regi); - mips64_fill_fpregset (fpregsetp, - mips_regnum (current_gdbarch)->fp_control_status); - mips64_fill_fpregset (fpregsetp, (mips_regnum (current_gdbarch) - ->fp_implementation_revision)); - } -} - - -/* Map gdb internal register number to ptrace ``address''. - These ``addresses'' are normally defined in <asm/ptrace.h>. */ - -static CORE_ADDR -mips64_linux_register_addr (int regno, CORE_ADDR blockend) -{ - int regaddr; - - if (regno < 0 || regno >= NUM_REGS) - error (_("Bogon register number %d."), regno); - - if (regno < 32) - regaddr = regno; - else if ((regno >= mips_regnum (current_gdbarch)->fp0) - && (regno < mips_regnum (current_gdbarch)->fp0 + 32)) - regaddr = MIPS64_FPR_BASE + (regno - FP0_REGNUM); - else if (regno == mips_regnum (current_gdbarch)->pc) - regaddr = MIPS64_PC; - else if (regno == mips_regnum (current_gdbarch)->cause) - regaddr = MIPS64_CAUSE; - else if (regno == mips_regnum (current_gdbarch)->badvaddr) - regaddr = MIPS64_BADVADDR; - else if (regno == mips_regnum (current_gdbarch)->lo) - regaddr = MIPS64_MMLO; - else if (regno == mips_regnum (current_gdbarch)->hi) - regaddr = MIPS64_MMHI; - else if (regno == mips_regnum (current_gdbarch)->fp_control_status) - regaddr = MIPS64_FPC_CSR; - else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision) - regaddr = MIPS64_FPC_EIR; - else - error (_("Unknowable register number %d."), regno); - - return regaddr; -} - -/* Use a local version of this function to get the correct types for - regsets, until multi-arch core support is ready. */ - -static void -fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, - int which, CORE_ADDR reg_addr) -{ - mips_elf_gregset_t gregset; - mips_elf_fpregset_t fpregset; - mips64_elf_gregset_t gregset64; - mips64_elf_fpregset_t fpregset64; - - if (which == 0) - { - if (core_reg_size == sizeof (gregset)) - { - memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset)); - mips_supply_gregset (&gregset); - } - else if (core_reg_size == sizeof (gregset64)) - { - memcpy ((char *) &gregset64, core_reg_sect, sizeof (gregset64)); - mips64_supply_gregset (&gregset64); - } - else - { - warning (_("wrong size gregset struct in core file")); - } - } - else if (which == 2) - { - if (core_reg_size == sizeof (fpregset)) - { - memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset)); - mips_supply_fpregset (&fpregset); - } - else if (core_reg_size == sizeof (fpregset64)) - { - memcpy ((char *) &fpregset64, core_reg_sect, - sizeof (fpregset64)); - mips64_supply_fpregset (&fpregset64); - } - else - { - warning (_("wrong size fpregset struct in core file")); - } - } -} - -/* Register that we are able to handle ELF file formats using standard - procfs "regset" structures. */ - -static struct core_fns regset_core_fns = -{ - bfd_target_elf_flavour, /* core_flavour */ - default_check_format, /* check_format */ - default_core_sniffer, /* core_sniffer */ - fetch_core_registers, /* core_read_registers */ - NULL /* next */ -}; - -/* Handle for obtaining pointer to the current register_addr() - function for a given architecture. */ -static struct gdbarch_data *register_addr_data; - -CORE_ADDR -register_addr (int regno, CORE_ADDR blockend) -{ - CORE_ADDR (*register_addr_ptr) (int, CORE_ADDR) = - gdbarch_data (current_gdbarch, register_addr_data); - - gdb_assert (register_addr_ptr != 0); - - return register_addr_ptr (regno, blockend); -} - -static void -set_mips_linux_register_addr (struct gdbarch *gdbarch, - CORE_ADDR (*register_addr_ptr) (int, - CORE_ADDR)) -{ - deprecated_set_gdbarch_data (gdbarch, register_addr_data, - register_addr_ptr); -} - -static void * -init_register_addr_data (struct gdbarch *gdbarch) -{ - return 0; -} - -/* Check the code at PC for a dynamic linker lazy resolution stub. - Because they aren't in the .plt section, we pattern-match on the - code generated by GNU ld. They look like this: - - lw t9,0x8010(gp) - addu t7,ra - jalr t9,ra - addiu t8,zero,INDEX - - (with the appropriate doubleword instructions for N64). Also - return the dynamic symbol index used in the last instruction. */ - -static int -mips_linux_in_dynsym_stub (CORE_ADDR pc, char *name) -{ - unsigned char buf[28], *p; - ULONGEST insn, insn1; - int n64 = (mips_abi (current_gdbarch) == MIPS_ABI_N64); - - read_memory (pc - 12, buf, 28); - - if (n64) - { - /* ld t9,0x8010(gp) */ - insn1 = 0xdf998010; - } - else - { - /* lw t9,0x8010(gp) */ - insn1 = 0x8f998010; - } - - p = buf + 12; - while (p >= buf) - { - insn = extract_unsigned_integer (p, 4); - if (insn == insn1) - break; - p -= 4; - } - if (p < buf) - return 0; - - insn = extract_unsigned_integer (p + 4, 4); - if (n64) - { - /* daddu t7,ra */ - if (insn != 0x03e0782d) - return 0; - } - else - { - /* addu t7,ra */ - if (insn != 0x03e07821) - return 0; - } - - insn = extract_unsigned_integer (p + 8, 4); - /* jalr t9,ra */ - if (insn != 0x0320f809) - return 0; - - insn = extract_unsigned_integer (p + 12, 4); - if (n64) - { - /* daddiu t8,zero,0 */ - if ((insn & 0xffff0000) != 0x64180000) - return 0; - } - else - { - /* addiu t8,zero,0 */ - if ((insn & 0xffff0000) != 0x24180000) - return 0; - } - - return (insn & 0xffff); -} - -/* Return non-zero iff PC belongs to the dynamic linker resolution - code or to a stub. */ - -int -mips_linux_in_dynsym_resolve_code (CORE_ADDR pc) -{ - /* Check whether PC is in the dynamic linker. This also checks - whether it is in the .plt section, which MIPS does not use. */ - if (in_solib_dynsym_resolve_code (pc)) - return 1; - - /* Pattern match for the stub. It would be nice if there were a - more efficient way to avoid this check. */ - if (mips_linux_in_dynsym_stub (pc, NULL)) - return 1; - - return 0; -} - -/* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c, - and glibc_skip_solib_resolver in glibc-tdep.c. The normal glibc - implementation of this triggers at "fixup" from the same objfile as - "_dl_runtime_resolve"; MIPS GNU/Linux can trigger at - "__dl_runtime_resolve" directly. An unresolved PLT entry will - point to _dl_runtime_resolve, which will first call - __dl_runtime_resolve, and then pass control to the resolved - function. */ - -static CORE_ADDR -mips_linux_skip_resolver (struct gdbarch *gdbarch, CORE_ADDR pc) -{ - struct minimal_symbol *resolver; - - resolver = lookup_minimal_symbol ("__dl_runtime_resolve", NULL, NULL); - - if (resolver && SYMBOL_VALUE_ADDRESS (resolver) == pc) - return frame_pc_unwind (get_current_frame ()); - - return 0; -} - -/* Signal trampoline support. There are four supported layouts for a - signal frame: o32 sigframe, o32 rt_sigframe, n32 rt_sigframe, and - n64 rt_sigframe. We handle them all independently; not the most - efficient way, but simplest. First, declare all the unwinders. */ - -static void mips_linux_o32_sigframe_init (const struct tramp_frame *self, - struct frame_info *next_frame, - struct trad_frame_cache *this_cache, - CORE_ADDR func); - -static void mips_linux_n32n64_sigframe_init (const struct tramp_frame *self, - struct frame_info *next_frame, - struct trad_frame_cache *this_cache, - CORE_ADDR func); - -#define MIPS_NR_LINUX 4000 -#define MIPS_NR_N64_LINUX 5000 -#define MIPS_NR_N32_LINUX 6000 - -#define MIPS_NR_sigreturn MIPS_NR_LINUX + 119 -#define MIPS_NR_rt_sigreturn MIPS_NR_LINUX + 193 -#define MIPS_NR_N64_rt_sigreturn MIPS_NR_N64_LINUX + 211 -#define MIPS_NR_N32_rt_sigreturn MIPS_NR_N32_LINUX + 211 - -#define MIPS_INST_LI_V0_SIGRETURN 0x24020000 + MIPS_NR_sigreturn -#define MIPS_INST_LI_V0_RT_SIGRETURN 0x24020000 + MIPS_NR_rt_sigreturn -#define MIPS_INST_LI_V0_N64_RT_SIGRETURN 0x24020000 + MIPS_NR_N64_rt_sigreturn -#define MIPS_INST_LI_V0_N32_RT_SIGRETURN 0x24020000 + MIPS_NR_N32_rt_sigreturn -#define MIPS_INST_SYSCALL 0x0000000c - -static const struct tramp_frame mips_linux_o32_sigframe = { - SIGTRAMP_FRAME, - 4, - { - { MIPS_INST_LI_V0_SIGRETURN, -1 }, - { MIPS_INST_SYSCALL, -1 }, - { TRAMP_SENTINEL_INSN, -1 } - }, - mips_linux_o32_sigframe_init -}; - -static const struct tramp_frame mips_linux_o32_rt_sigframe = { - SIGTRAMP_FRAME, - 4, - { - { MIPS_INST_LI_V0_RT_SIGRETURN, -1 }, - { MIPS_INST_SYSCALL, -1 }, - { TRAMP_SENTINEL_INSN, -1 } }, - mips_linux_o32_sigframe_init -}; - -static const struct tramp_frame mips_linux_n32_rt_sigframe = { - SIGTRAMP_FRAME, - 4, - { - { MIPS_INST_LI_V0_N32_RT_SIGRETURN, -1 }, - { MIPS_INST_SYSCALL, -1 }, - { TRAMP_SENTINEL_INSN, -1 } - }, - mips_linux_n32n64_sigframe_init -}; - -static const struct tramp_frame mips_linux_n64_rt_sigframe = { - SIGTRAMP_FRAME, - 4, - { MIPS_INST_LI_V0_N64_RT_SIGRETURN, - MIPS_INST_SYSCALL, - TRAMP_SENTINEL_INSN }, - mips_linux_n32n64_sigframe_init -}; - -/* *INDENT-OFF* */ -/* The unwinder for o32 signal frames. The legacy structures look - like this: - - struct sigframe { - u32 sf_ass[4]; [argument save space for o32] - u32 sf_code[2]; [signal trampoline] - struct sigcontext sf_sc; - sigset_t sf_mask; - }; - - struct sigcontext { - unsigned int sc_regmask; [Unused] - unsigned int sc_status; - unsigned long long sc_pc; - unsigned long long sc_regs[32]; - unsigned long long sc_fpregs[32]; - unsigned int sc_ownedfp; - unsigned int sc_fpc_csr; - unsigned int sc_fpc_eir; [Unused] - unsigned int sc_used_math; - unsigned int sc_ssflags; [Unused] - [Alignment hole of four bytes] - unsigned long long sc_mdhi; - unsigned long long sc_mdlo; - - unsigned int sc_cause; [Unused] - unsigned int sc_badvaddr; [Unused] - - unsigned long sc_sigset[4]; [kernel's sigset_t] - }; - - The RT signal frames look like this: - - struct rt_sigframe { - u32 rs_ass[4]; [argument save space for o32] - u32 rs_code[2] [signal trampoline] - struct siginfo rs_info; - struct ucontext rs_uc; - }; - - struct ucontext { - unsigned long uc_flags; - struct ucontext *uc_link; - stack_t uc_stack; - [Alignment hole of four bytes] - struct sigcontext uc_mcontext; - sigset_t uc_sigmask; - }; */ -/* *INDENT-ON* */ - -#define SIGFRAME_CODE_OFFSET (4 * 4) -#define SIGFRAME_SIGCONTEXT_OFFSET (6 * 4) - -#define RTSIGFRAME_SIGINFO_SIZE 128 -#define STACK_T_SIZE (3 * 4) -#define UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + STACK_T_SIZE + 4) -#define RTSIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \ - + RTSIGFRAME_SIGINFO_SIZE \ - + UCONTEXT_SIGCONTEXT_OFFSET) - -#define SIGCONTEXT_PC (1 * 8) -#define SIGCONTEXT_REGS (2 * 8) -#define SIGCONTEXT_FPREGS (34 * 8) -#define SIGCONTEXT_FPCSR (66 * 8 + 4) -#define SIGCONTEXT_HI (69 * 8) -#define SIGCONTEXT_LO (70 * 8) -#define SIGCONTEXT_CAUSE (71 * 8 + 0) -#define SIGCONTEXT_BADVADDR (71 * 8 + 4) - -#define SIGCONTEXT_REG_SIZE 8 - -static void -mips_linux_o32_sigframe_init (const struct tramp_frame *self, - struct frame_info *next_frame, - struct trad_frame_cache *this_cache, - CORE_ADDR func) -{ - int ireg, reg_position; - CORE_ADDR sigcontext_base = func - SIGFRAME_CODE_OFFSET; - const struct mips_regnum *regs = mips_regnum (current_gdbarch); - CORE_ADDR regs_base; - - if (self == &mips_linux_o32_sigframe) - sigcontext_base += SIGFRAME_SIGCONTEXT_OFFSET; - else - sigcontext_base += RTSIGFRAME_SIGCONTEXT_OFFSET; - - /* I'm not proud of this hack. Eventually we will have the - infrastructure to indicate the size of saved registers on a - per-frame basis, but right now we don't; the kernel saves eight - bytes but we only want four. Use regs_base to access any - 64-bit fields. */ - if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) - regs_base = sigcontext_base + 4; - else - regs_base = sigcontext_base; - -#if 0 - trad_frame_set_reg_addr (this_cache, ORIG_ZERO_REGNUM + NUM_REGS, - regs_base + SIGCONTEXT_REGS); -#endif - - for (ireg = 1; ireg < 32; ireg++) - trad_frame_set_reg_addr (this_cache, - ireg + MIPS_ZERO_REGNUM + NUM_REGS, - regs_base + SIGCONTEXT_REGS - + ireg * SIGCONTEXT_REG_SIZE); - - /* The way that floating point registers are saved, unfortunately, - depends on the architecture the kernel is built for. For the r3000 and - tx39, four bytes of each register are at the beginning of each of the - 32 eight byte slots. For everything else, the registers are saved - using double precision; only the even-numbered slots are initialized, - and the high bits are the odd-numbered register. Assume the latter - layout, since we can't tell, and it's much more common. Which bits are - the "high" bits depends on endianness. */ - for (ireg = 0; ireg < 32; ireg++) - if ((TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) != (ireg & 1)) - trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + NUM_REGS, - sigcontext_base + SIGCONTEXT_FPREGS + 4 - + (ireg & ~1) * SIGCONTEXT_REG_SIZE); - else - trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + NUM_REGS, - sigcontext_base + SIGCONTEXT_FPREGS - + (ireg & ~1) * SIGCONTEXT_REG_SIZE); - - trad_frame_set_reg_addr (this_cache, regs->pc + NUM_REGS, - regs_base + SIGCONTEXT_PC); - - trad_frame_set_reg_addr (this_cache, - regs->fp_control_status + NUM_REGS, - sigcontext_base + SIGCONTEXT_FPCSR); - trad_frame_set_reg_addr (this_cache, regs->hi + NUM_REGS, - regs_base + SIGCONTEXT_HI); - trad_frame_set_reg_addr (this_cache, regs->lo + NUM_REGS, - regs_base + SIGCONTEXT_LO); - trad_frame_set_reg_addr (this_cache, regs->cause + NUM_REGS, - sigcontext_base + SIGCONTEXT_CAUSE); - trad_frame_set_reg_addr (this_cache, regs->badvaddr + NUM_REGS, - sigcontext_base + SIGCONTEXT_BADVADDR); - - /* Choice of the bottom of the sigframe is somewhat arbitrary. */ - trad_frame_set_id (this_cache, - frame_id_build (func - SIGFRAME_CODE_OFFSET, - func)); -} - -/* *INDENT-OFF* */ -/* For N32/N64 things look different. There is no non-rt signal frame. - - struct rt_sigframe_n32 { - u32 rs_ass[4]; [ argument save space for o32 ] - u32 rs_code[2]; [ signal trampoline ] - struct siginfo rs_info; - struct ucontextn32 rs_uc; - }; - - struct ucontextn32 { - u32 uc_flags; - s32 uc_link; - stack32_t uc_stack; - struct sigcontext uc_mcontext; - sigset_t uc_sigmask; [ mask last for extensibility ] - }; - - struct rt_sigframe_n32 { - u32 rs_ass[4]; [ argument save space for o32 ] - u32 rs_code[2]; [ signal trampoline ] - struct siginfo rs_info; - struct ucontext rs_uc; - }; - - struct ucontext { - unsigned long uc_flags; - struct ucontext *uc_link; - stack_t uc_stack; - struct sigcontext uc_mcontext; - sigset_t uc_sigmask; [ mask last for extensibility ] - }; - - And the sigcontext is different (this is for both n32 and n64): - - struct sigcontext { - unsigned long long sc_regs[32]; - unsigned long long sc_fpregs[32]; - unsigned long long sc_mdhi; - unsigned long long sc_mdlo; - unsigned long long sc_pc; - unsigned int sc_status; - unsigned int sc_fpc_csr; - unsigned int sc_fpc_eir; - unsigned int sc_used_math; - unsigned int sc_cause; - unsigned int sc_badvaddr; - }; */ -/* *INDENT-ON* */ - -#define N32_STACK_T_SIZE STACK_T_SIZE -#define N64_STACK_T_SIZE (2 * 8 + 4) -#define N32_UCONTEXT_SIGCONTEXT_OFFSET (2 * 4 + N32_STACK_T_SIZE + 4) -#define N64_UCONTEXT_SIGCONTEXT_OFFSET (2 * 8 + N64_STACK_T_SIZE + 4) -#define N32_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \ - + RTSIGFRAME_SIGINFO_SIZE \ - + N32_UCONTEXT_SIGCONTEXT_OFFSET) -#define N64_SIGFRAME_SIGCONTEXT_OFFSET (SIGFRAME_SIGCONTEXT_OFFSET \ - + RTSIGFRAME_SIGINFO_SIZE \ - + N64_UCONTEXT_SIGCONTEXT_OFFSET) - -#define N64_SIGCONTEXT_REGS (0 * 8) -#define N64_SIGCONTEXT_FPREGS (32 * 8) -#define N64_SIGCONTEXT_HI (64 * 8) -#define N64_SIGCONTEXT_LO (65 * 8) -#define N64_SIGCONTEXT_PC (66 * 8) -#define N64_SIGCONTEXT_FPCSR (67 * 8 + 1 * 4) -#define N64_SIGCONTEXT_FIR (67 * 8 + 2 * 4) -#define N64_SIGCONTEXT_CAUSE (67 * 8 + 4 * 4) -#define N64_SIGCONTEXT_BADVADDR (67 * 8 + 5 * 4) - -#define N64_SIGCONTEXT_REG_SIZE 8 - -static void -mips_linux_n32n64_sigframe_init (const struct tramp_frame *self, - struct frame_info *next_frame, - struct trad_frame_cache *this_cache, - CORE_ADDR func) -{ - int ireg, reg_position; - CORE_ADDR sigcontext_base = func - SIGFRAME_CODE_OFFSET; - const struct mips_regnum *regs = mips_regnum (current_gdbarch); - - if (self == &mips_linux_n32_rt_sigframe) - sigcontext_base += N32_SIGFRAME_SIGCONTEXT_OFFSET; - else - sigcontext_base += N64_SIGFRAME_SIGCONTEXT_OFFSET; - -#if 0 - trad_frame_set_reg_addr (this_cache, ORIG_ZERO_REGNUM + NUM_REGS, - sigcontext_base + N64_SIGCONTEXT_REGS); -#endif - - for (ireg = 1; ireg < 32; ireg++) - trad_frame_set_reg_addr (this_cache, - ireg + MIPS_ZERO_REGNUM + NUM_REGS, - sigcontext_base + N64_SIGCONTEXT_REGS - + ireg * N64_SIGCONTEXT_REG_SIZE); - - for (ireg = 0; ireg < 32; ireg++) - trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + NUM_REGS, - sigcontext_base + N64_SIGCONTEXT_FPREGS - + ireg * N64_SIGCONTEXT_REG_SIZE); - - trad_frame_set_reg_addr (this_cache, regs->pc + NUM_REGS, - sigcontext_base + N64_SIGCONTEXT_PC); - - trad_frame_set_reg_addr (this_cache, - regs->fp_control_status + NUM_REGS, - sigcontext_base + N64_SIGCONTEXT_FPCSR); - trad_frame_set_reg_addr (this_cache, regs->hi + NUM_REGS, - sigcontext_base + N64_SIGCONTEXT_HI); - trad_frame_set_reg_addr (this_cache, regs->lo + NUM_REGS, - sigcontext_base + N64_SIGCONTEXT_LO); - trad_frame_set_reg_addr (this_cache, regs->cause + NUM_REGS, - sigcontext_base + N64_SIGCONTEXT_CAUSE); - trad_frame_set_reg_addr (this_cache, regs->badvaddr + NUM_REGS, - sigcontext_base + N64_SIGCONTEXT_BADVADDR); - - /* Choice of the bottom of the sigframe is somewhat arbitrary. */ - trad_frame_set_id (this_cache, - frame_id_build (func - SIGFRAME_CODE_OFFSET, - func)); -} - -/* Wrapper functions. These are only used by libthread_db. */ - -void -supply_gregset (mips_elf_gregset_t *gregsetp) -{ - if (mips_isa_regsize (current_gdbarch) == 4) - mips_supply_gregset (gregsetp); - else - mips64_supply_gregset ((void *) gregsetp); -} - -void -fill_gregset (mips_elf_gregset_t *gregsetp, int regno) -{ - if (mips_isa_regsize (current_gdbarch) == 4) - mips_fill_gregset (gregsetp, regno); - else - mips64_fill_gregset ((void *) gregsetp, regno); -} - -/* Likewise, unpack an elf_fpregset_t. */ - -void -supply_fpregset (mips_elf_fpregset_t *fpregsetp) -{ - if (mips_isa_regsize (current_gdbarch) == 4) - mips_supply_fpregset (fpregsetp); - else - mips64_supply_fpregset ((void *) fpregsetp); -} - -/* Likewise, pack one or all floating point registers into an - elf_fpregset_t. */ - -void -fill_fpregset (mips_elf_fpregset_t *fpregsetp, int regno) -{ - if (mips_isa_regsize (current_gdbarch) == 4) - mips_fill_fpregset (fpregsetp, regno); - else - mips64_fill_fpregset ((void *) fpregsetp, regno); -} - -/* Initialize one of the GNU/Linux OS ABIs. */ - -static void -mips_linux_init_abi (struct gdbarch_info info, - struct gdbarch *gdbarch) -{ - struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); - enum mips_abi abi = mips_abi (gdbarch); - - switch (abi) - { - case MIPS_ABI_O32: - set_gdbarch_get_longjmp_target (gdbarch, - mips_linux_get_longjmp_target); - set_solib_svr4_fetch_link_map_offsets - (gdbarch, svr4_ilp32_fetch_link_map_offsets); - set_mips_linux_register_addr (gdbarch, mips_linux_register_addr); - tramp_frame_prepend_unwinder (gdbarch, &mips_linux_o32_sigframe); - tramp_frame_prepend_unwinder (gdbarch, &mips_linux_o32_rt_sigframe); - break; - case MIPS_ABI_N32: - set_gdbarch_get_longjmp_target (gdbarch, - mips_linux_get_longjmp_target); - set_solib_svr4_fetch_link_map_offsets - (gdbarch, svr4_ilp32_fetch_link_map_offsets); - set_mips_linux_register_addr (gdbarch, mips64_linux_register_addr); - set_gdbarch_long_double_bit (gdbarch, 128); - /* These floatformats should probably be renamed. MIPS uses - the same 128-bit IEEE floating point format that IA-64 uses, - except that the quiet/signalling NaN bit is reversed (GDB - does not distinguish between quiet and signalling NaNs). */ - if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) - set_gdbarch_long_double_format (gdbarch, &floatformat_ia64_quad_big); - else - set_gdbarch_long_double_format (gdbarch, &floatformat_ia64_quad_little); - tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n32_rt_sigframe); - break; - case MIPS_ABI_N64: - set_gdbarch_get_longjmp_target (gdbarch, - mips64_linux_get_longjmp_target); - set_solib_svr4_fetch_link_map_offsets - (gdbarch, svr4_lp64_fetch_link_map_offsets); - set_mips_linux_register_addr (gdbarch, mips64_linux_register_addr); - set_gdbarch_long_double_bit (gdbarch, 128); - /* These floatformats should probably be renamed. MIPS uses - the same 128-bit IEEE floating point format that IA-64 uses, - except that the quiet/signalling NaN bit is reversed (GDB - does not distinguish between quiet and signalling NaNs). */ - if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) - set_gdbarch_long_double_format (gdbarch, &floatformat_ia64_quad_big); - else - set_gdbarch_long_double_format (gdbarch, &floatformat_ia64_quad_little); - tramp_frame_prepend_unwinder (gdbarch, &mips_linux_n64_rt_sigframe); - break; - default: - internal_error (__FILE__, __LINE__, _("can't handle ABI")); - break; - } - - set_gdbarch_skip_solib_resolver (gdbarch, mips_linux_skip_resolver); - - set_gdbarch_software_single_step (gdbarch, mips_software_single_step); - - /* Enable TLS support. */ - set_gdbarch_fetch_tls_load_module_address (gdbarch, - svr4_fetch_objfile_link_map); -} - -void -_initialize_mips_linux_tdep (void) -{ - const struct bfd_arch_info *arch_info; - - register_addr_data = - gdbarch_data_register_post_init (init_register_addr_data); - - for (arch_info = bfd_lookup_arch (bfd_arch_mips, 0); - arch_info != NULL; - arch_info = arch_info->next) - { - gdbarch_register_osabi (bfd_arch_mips, arch_info->mach, - GDB_OSABI_LINUX, - mips_linux_init_abi); - } - - deprecated_add_core_fns (®set_core_fns); -} |