030f20e19e
* gdbarch.sh (gdbarch_data_pre_init_fytpe) (gdbarch_data_register_pre_init, gdbarch_data_post_init_fytpe) (gdbarch_data_register_post_init): Replace gdbarch_data_init_ftype and register_gdbarch_data. (deprecated_set_gdbarch_data): Rename set_gdbarch_data. (struct gdbarch_data): Replace "init" by "pre_init" and "post_init". * gdbarch.h, gdbarch.c: Re-generate. * dwarf2-frame.c (dwarf2_frame_init): Replace "gdbarch" paramter with"obstack", use OBSTACK_ZALLOC. (dwarf2_frame_ops): Delete. (dwarf2_frame_set_init_reg): Use gdbarch_data. (dwarf2_frame_init_reg): Use gdbarch_data. (_initialize_dwarf2_frame): Use gdbarch_data_register_pre_init. * solib-svr4.c (set_solib_svr4_fetch_link_map_offsets) (_initialize_svr4_solib): Update. * user-regs.c (_initialize_user_regs): Update. * reggroups.c (_initialize_reggroup): Update. * regcache.c (_initialize_regcache): Update. * mips-linux-tdep.c (_initialize_mips_linux_tdep): Update. * libunwind-frame.c (_initialize_libunwind_frame): Update. * gnu-v3-abi.c (init_gnuv3_ops): Update. * frame-unwind.c (_initialize_frame_unwind): Update. * frame-base.c (_initialize_frame_base): Update. * user-regs.c (user_reg_add): Update. * reggroups.c (reggroup_add): Update. * mips-linux-tdep.c (set_mips_linux_register_addr): Update. * libunwind-frame.c (libunwind_frame_set_descr): Update. * frame-unwind.c (frame_unwind_append_sniffer): Update. * frame-base.c (frame_base_table): Update. * remote.c (_initialize_remote): Update. * gdb_obstack.h (OBSTACK_ZALLOC, OBSTACK_CALLOC): Define.
859 lines
24 KiB
C
859 lines
24 KiB
C
/* Target-dependent code for GNU/Linux on MIPS processors.
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Copyright 2001, 2002, 2004 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "target.h"
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#include "solib-svr4.h"
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#include "osabi.h"
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#include "mips-tdep.h"
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#include "gdb_string.h"
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#include "gdb_assert.h"
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#include "frame.h"
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/* Copied from <asm/elf.h>. */
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#define ELF_NGREG 45
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#define ELF_NFPREG 33
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typedef unsigned char elf_greg_t[4];
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typedef elf_greg_t elf_gregset_t[ELF_NGREG];
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typedef unsigned char elf_fpreg_t[8];
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typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
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/* 0 - 31 are integer registers, 32 - 63 are fp registers. */
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#define FPR_BASE 32
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#define PC 64
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#define CAUSE 65
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#define BADVADDR 66
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#define MMHI 67
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#define MMLO 68
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#define FPC_CSR 69
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#define FPC_EIR 70
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#define EF_REG0 6
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#define EF_REG31 37
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#define EF_LO 38
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#define EF_HI 39
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#define EF_CP0_EPC 40
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#define EF_CP0_BADVADDR 41
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#define EF_CP0_STATUS 42
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#define EF_CP0_CAUSE 43
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#define EF_SIZE 180
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/* Figure out where the longjmp will land.
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We expect the first arg to be a pointer to the jmp_buf structure from
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which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
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is copied into PC. This routine returns 1 on success. */
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#define MIPS_LINUX_JB_ELEMENT_SIZE 4
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#define MIPS_LINUX_JB_PC 0
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static int
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mips_linux_get_longjmp_target (CORE_ADDR *pc)
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{
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CORE_ADDR jb_addr;
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char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
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jb_addr = read_register (A0_REGNUM);
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if (target_read_memory (jb_addr
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+ MIPS_LINUX_JB_PC * MIPS_LINUX_JB_ELEMENT_SIZE,
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buf, TARGET_PTR_BIT / TARGET_CHAR_BIT))
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return 0;
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*pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
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return 1;
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}
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/* Transform the bits comprising a 32-bit register to the right size
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for supply_register(). This is needed when mips_regsize() is 8. */
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static void
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supply_32bit_reg (int regnum, const void *addr)
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{
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char buf[MAX_REGISTER_SIZE];
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store_signed_integer (buf, DEPRECATED_REGISTER_RAW_SIZE (regnum),
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extract_signed_integer (addr, 4));
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supply_register (regnum, buf);
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}
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/* Unpack an elf_gregset_t into GDB's register cache. */
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void
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supply_gregset (elf_gregset_t *gregsetp)
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{
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int regi;
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elf_greg_t *regp = *gregsetp;
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char zerobuf[MAX_REGISTER_SIZE];
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memset (zerobuf, 0, MAX_REGISTER_SIZE);
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for (regi = EF_REG0; regi <= EF_REG31; regi++)
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supply_32bit_reg ((regi - EF_REG0), (char *)(regp + regi));
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supply_32bit_reg (mips_regnum (current_gdbarch)->lo,
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(char *)(regp + EF_LO));
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supply_32bit_reg (mips_regnum (current_gdbarch)->hi,
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(char *)(regp + EF_HI));
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supply_32bit_reg (mips_regnum (current_gdbarch)->pc,
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(char *)(regp + EF_CP0_EPC));
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supply_32bit_reg (mips_regnum (current_gdbarch)->badvaddr,
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(char *)(regp + EF_CP0_BADVADDR));
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supply_32bit_reg (PS_REGNUM, (char *)(regp + EF_CP0_STATUS));
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supply_32bit_reg (mips_regnum (current_gdbarch)->cause,
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(char *)(regp + EF_CP0_CAUSE));
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/* Fill inaccessible registers with zero. */
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supply_register (UNUSED_REGNUM, zerobuf);
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for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
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supply_register (regi, zerobuf);
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}
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/* Pack our registers (or one register) into an elf_gregset_t. */
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void
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fill_gregset (elf_gregset_t *gregsetp, int regno)
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{
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int regaddr, regi;
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elf_greg_t *regp = *gregsetp;
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void *dst;
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if (regno == -1)
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{
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memset (regp, 0, sizeof (elf_gregset_t));
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for (regi = 0; regi < 32; regi++)
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fill_gregset (gregsetp, regi);
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fill_gregset (gregsetp, mips_regnum (current_gdbarch)->lo);
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fill_gregset (gregsetp, mips_regnum (current_gdbarch)->hi);
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fill_gregset (gregsetp, mips_regnum (current_gdbarch)->pc);
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fill_gregset (gregsetp, mips_regnum (current_gdbarch)->badvaddr);
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fill_gregset (gregsetp, PS_REGNUM);
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fill_gregset (gregsetp, mips_regnum (current_gdbarch)->cause);
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return;
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}
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if (regno < 32)
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{
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dst = regp + regno + EF_REG0;
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regcache_collect (regno, dst);
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return;
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}
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if (regno == mips_regnum (current_gdbarch)->lo)
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regaddr = EF_LO;
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else if (regno == mips_regnum (current_gdbarch)->hi)
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regaddr = EF_HI;
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else if (regno == mips_regnum (current_gdbarch)->pc)
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regaddr = EF_CP0_EPC;
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else if (regno == mips_regnum (current_gdbarch)->badvaddr)
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regaddr = EF_CP0_BADVADDR;
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else if (regno == PS_REGNUM)
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regaddr = EF_CP0_STATUS;
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else if (regno == mips_regnum (current_gdbarch)->cause)
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regaddr = EF_CP0_CAUSE;
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else
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regaddr = -1;
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if (regaddr != -1)
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{
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dst = regp + regaddr;
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regcache_collect (regno, dst);
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}
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}
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/* Likewise, unpack an elf_fpregset_t. */
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void
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supply_fpregset (elf_fpregset_t *fpregsetp)
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{
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int regi;
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char zerobuf[MAX_REGISTER_SIZE];
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memset (zerobuf, 0, MAX_REGISTER_SIZE);
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for (regi = 0; regi < 32; regi++)
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supply_register (FP0_REGNUM + regi,
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(char *)(*fpregsetp + regi));
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supply_register (mips_regnum (current_gdbarch)->fp_control_status,
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(char *)(*fpregsetp + 32));
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/* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */
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supply_register (mips_regnum (current_gdbarch)->fp_implementation_revision,
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zerobuf);
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}
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/* Likewise, pack one or all floating point registers into an
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elf_fpregset_t. */
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void
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fill_fpregset (elf_fpregset_t *fpregsetp, int regno)
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{
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char *from, *to;
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if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
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{
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from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
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to = (char *) (*fpregsetp + regno - FP0_REGNUM);
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memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno - FP0_REGNUM));
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}
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else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
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{
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from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
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to = (char *) (*fpregsetp + 32);
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memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno));
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}
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else if (regno == -1)
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{
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int regi;
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for (regi = 0; regi < 32; regi++)
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fill_fpregset (fpregsetp, FP0_REGNUM + regi);
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fill_fpregset(fpregsetp, mips_regnum (current_gdbarch)->fp_control_status);
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}
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}
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/* Map gdb internal register number to ptrace ``address''.
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These ``addresses'' are normally defined in <asm/ptrace.h>. */
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static CORE_ADDR
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mips_linux_register_addr (int regno, CORE_ADDR blockend)
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{
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int regaddr;
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if (regno < 0 || regno >= NUM_REGS)
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error ("Bogon register number %d.", regno);
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if (regno < 32)
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regaddr = regno;
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else if ((regno >= mips_regnum (current_gdbarch)->fp0)
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&& (regno < mips_regnum (current_gdbarch)->fp0 + 32))
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regaddr = FPR_BASE + (regno - mips_regnum (current_gdbarch)->fp0);
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else if (regno == mips_regnum (current_gdbarch)->pc)
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regaddr = PC;
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else if (regno == mips_regnum (current_gdbarch)->cause)
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regaddr = CAUSE;
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else if (regno == mips_regnum (current_gdbarch)->badvaddr)
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regaddr = BADVADDR;
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else if (regno == mips_regnum (current_gdbarch)->lo)
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regaddr = MMLO;
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else if (regno == mips_regnum (current_gdbarch)->hi)
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regaddr = MMHI;
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else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
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regaddr = FPC_CSR;
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else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
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regaddr = FPC_EIR;
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else
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error ("Unknowable register number %d.", regno);
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return regaddr;
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}
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/* Fetch (and possibly build) an appropriate link_map_offsets
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structure for native GNU/Linux MIPS targets using the struct offsets
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defined in link.h (but without actual reference to that file).
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This makes it possible to access GNU/Linux MIPS shared libraries from a
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GDB that was built on a different host platform (for cross debugging). */
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static struct link_map_offsets *
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mips_linux_svr4_fetch_link_map_offsets (void)
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{
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static struct link_map_offsets lmo;
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static struct link_map_offsets *lmp = NULL;
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if (lmp == NULL)
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{
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lmp = &lmo;
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lmo.r_debug_size = 8; /* The actual size is 20 bytes, but
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this is all we need. */
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lmo.r_map_offset = 4;
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lmo.r_map_size = 4;
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lmo.link_map_size = 20;
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lmo.l_addr_offset = 0;
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lmo.l_addr_size = 4;
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lmo.l_name_offset = 4;
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lmo.l_name_size = 4;
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lmo.l_next_offset = 12;
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lmo.l_next_size = 4;
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lmo.l_prev_offset = 16;
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lmo.l_prev_size = 4;
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}
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return lmp;
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}
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/* Support for 64-bit ABIs. */
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/* Copied from <asm/elf.h>. */
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#define MIPS64_ELF_NGREG 45
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#define MIPS64_ELF_NFPREG 33
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typedef unsigned char mips64_elf_greg_t[8];
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typedef mips64_elf_greg_t mips64_elf_gregset_t[MIPS64_ELF_NGREG];
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typedef unsigned char mips64_elf_fpreg_t[8];
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typedef mips64_elf_fpreg_t mips64_elf_fpregset_t[MIPS64_ELF_NFPREG];
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/* 0 - 31 are integer registers, 32 - 63 are fp registers. */
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#define MIPS64_FPR_BASE 32
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#define MIPS64_PC 64
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#define MIPS64_CAUSE 65
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#define MIPS64_BADVADDR 66
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#define MIPS64_MMHI 67
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#define MIPS64_MMLO 68
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#define MIPS64_FPC_CSR 69
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#define MIPS64_FPC_EIR 70
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#define MIPS64_EF_REG0 0
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#define MIPS64_EF_REG31 31
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#define MIPS64_EF_LO 32
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#define MIPS64_EF_HI 33
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#define MIPS64_EF_CP0_EPC 34
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#define MIPS64_EF_CP0_BADVADDR 35
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#define MIPS64_EF_CP0_STATUS 36
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#define MIPS64_EF_CP0_CAUSE 37
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#define MIPS64_EF_SIZE 304
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/* Figure out where the longjmp will land.
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We expect the first arg to be a pointer to the jmp_buf structure from
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which we extract the pc (MIPS_LINUX_JB_PC) that we will land at. The pc
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is copied into PC. This routine returns 1 on success. */
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/* Details about jmp_buf. */
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#define MIPS64_LINUX_JB_PC 0
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static int
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mips64_linux_get_longjmp_target (CORE_ADDR *pc)
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{
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CORE_ADDR jb_addr;
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void *buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT);
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int element_size = TARGET_PTR_BIT == 32 ? 4 : 8;
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jb_addr = read_register (A0_REGNUM);
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if (target_read_memory (jb_addr + MIPS64_LINUX_JB_PC * element_size,
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buf, TARGET_PTR_BIT / TARGET_CHAR_BIT))
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return 0;
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*pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
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return 1;
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}
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/* Unpack an elf_gregset_t into GDB's register cache. */
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static void
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mips64_supply_gregset (mips64_elf_gregset_t *gregsetp)
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{
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int regi;
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mips64_elf_greg_t *regp = *gregsetp;
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char zerobuf[MAX_REGISTER_SIZE];
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memset (zerobuf, 0, MAX_REGISTER_SIZE);
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for (regi = MIPS64_EF_REG0; regi <= MIPS64_EF_REG31; regi++)
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supply_register ((regi - MIPS64_EF_REG0), (char *)(regp + regi));
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supply_register (mips_regnum (current_gdbarch)->lo,
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(char *)(regp + MIPS64_EF_LO));
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supply_register (mips_regnum (current_gdbarch)->hi,
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(char *)(regp + MIPS64_EF_HI));
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supply_register (mips_regnum (current_gdbarch)->pc,
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(char *)(regp + MIPS64_EF_CP0_EPC));
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supply_register (mips_regnum (current_gdbarch)->badvaddr,
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(char *)(regp + MIPS64_EF_CP0_BADVADDR));
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supply_register (PS_REGNUM, (char *)(regp + MIPS64_EF_CP0_STATUS));
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supply_register (mips_regnum (current_gdbarch)->cause,
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(char *)(regp + MIPS64_EF_CP0_CAUSE));
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/* Fill inaccessible registers with zero. */
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supply_register (UNUSED_REGNUM, zerobuf);
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for (regi = FIRST_EMBED_REGNUM; regi < LAST_EMBED_REGNUM; regi++)
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supply_register (regi, zerobuf);
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}
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/* Pack our registers (or one register) into an elf_gregset_t. */
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static void
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mips64_fill_gregset (mips64_elf_gregset_t *gregsetp, int regno)
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{
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int regaddr, regi;
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mips64_elf_greg_t *regp = *gregsetp;
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void *src, *dst;
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if (regno == -1)
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{
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memset (regp, 0, sizeof (mips64_elf_gregset_t));
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for (regi = 0; regi < 32; regi++)
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mips64_fill_gregset (gregsetp, regi);
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mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->lo);
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mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->hi);
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mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->pc);
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mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->badvaddr);
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mips64_fill_gregset (gregsetp, PS_REGNUM);
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mips64_fill_gregset (gregsetp, mips_regnum (current_gdbarch)->cause);
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return;
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}
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if (regno < 32)
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{
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dst = regp + regno + MIPS64_EF_REG0;
|
|
regcache_collect (regno, dst);
|
|
return;
|
|
}
|
|
|
|
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 == 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)
|
|
{
|
|
dst = regp + regaddr;
|
|
regcache_collect (regno, dst);
|
|
}
|
|
}
|
|
|
|
/* Likewise, unpack an elf_fpregset_t. */
|
|
|
|
static void
|
|
mips64_supply_fpregset (mips64_elf_fpregset_t *fpregsetp)
|
|
{
|
|
int regi;
|
|
char zerobuf[MAX_REGISTER_SIZE];
|
|
|
|
memset (zerobuf, 0, MAX_REGISTER_SIZE);
|
|
|
|
for (regi = 0; regi < 32; regi++)
|
|
supply_register (FP0_REGNUM + regi,
|
|
(char *)(*fpregsetp + regi));
|
|
|
|
supply_register (mips_regnum (current_gdbarch)->fp_control_status,
|
|
(char *)(*fpregsetp + 32));
|
|
|
|
/* FIXME: how can we supply FCRIR? The ABI doesn't tell us. */
|
|
supply_register (mips_regnum (current_gdbarch)->fp_implementation_revision,
|
|
zerobuf);
|
|
}
|
|
|
|
/* Likewise, pack one or all floating point registers into an
|
|
elf_fpregset_t. */
|
|
|
|
static void
|
|
mips64_fill_fpregset (mips64_elf_fpregset_t *fpregsetp, int regno)
|
|
{
|
|
char *from, *to;
|
|
|
|
if ((regno >= FP0_REGNUM) && (regno < FP0_REGNUM + 32))
|
|
{
|
|
from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
|
|
to = (char *) (*fpregsetp + regno - FP0_REGNUM);
|
|
memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno - FP0_REGNUM));
|
|
}
|
|
else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
|
|
{
|
|
from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regno)];
|
|
to = (char *) (*fpregsetp + 32);
|
|
memcpy (to, from, DEPRECATED_REGISTER_RAW_SIZE (regno));
|
|
}
|
|
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);
|
|
}
|
|
}
|
|
|
|
|
|
/* 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)
|
|
{
|
|
elf_gregset_t gregset;
|
|
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));
|
|
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));
|
|
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 */
|
|
};
|
|
|
|
/* Fetch (and possibly build) an appropriate link_map_offsets
|
|
structure for native GNU/Linux MIPS targets using the struct offsets
|
|
defined in link.h (but without actual reference to that file).
|
|
|
|
This makes it possible to access GNU/Linux MIPS shared libraries from a
|
|
GDB that was built on a different host platform (for cross debugging). */
|
|
|
|
static struct link_map_offsets *
|
|
mips64_linux_svr4_fetch_link_map_offsets (void)
|
|
{
|
|
static struct link_map_offsets lmo;
|
|
static struct link_map_offsets *lmp = NULL;
|
|
|
|
if (lmp == NULL)
|
|
{
|
|
lmp = &lmo;
|
|
|
|
lmo.r_debug_size = 16; /* The actual size is 40 bytes, but
|
|
this is all we need. */
|
|
lmo.r_map_offset = 8;
|
|
lmo.r_map_size = 8;
|
|
|
|
lmo.link_map_size = 40;
|
|
|
|
lmo.l_addr_offset = 0;
|
|
lmo.l_addr_size = 8;
|
|
|
|
lmo.l_name_offset = 8;
|
|
lmo.l_name_size = 8;
|
|
|
|
lmo.l_next_offset = 24;
|
|
lmo.l_next_size = 8;
|
|
|
|
lmo.l_prev_offset = 32;
|
|
lmo.l_prev_size = 8;
|
|
}
|
|
|
|
return lmp;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
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, mips_linux_svr4_fetch_link_map_offsets);
|
|
set_mips_linux_register_addr (gdbarch, mips_linux_register_addr);
|
|
break;
|
|
case MIPS_ABI_N32:
|
|
set_gdbarch_get_longjmp_target (gdbarch,
|
|
mips_linux_get_longjmp_target);
|
|
set_solib_svr4_fetch_link_map_offsets
|
|
(gdbarch, mips_linux_svr4_fetch_link_map_offsets);
|
|
set_mips_linux_register_addr (gdbarch, mips64_linux_register_addr);
|
|
break;
|
|
case MIPS_ABI_N64:
|
|
set_gdbarch_get_longjmp_target (gdbarch,
|
|
mips64_linux_get_longjmp_target);
|
|
set_solib_svr4_fetch_link_map_offsets
|
|
(gdbarch, mips64_linux_svr4_fetch_link_map_offsets);
|
|
set_mips_linux_register_addr (gdbarch, mips64_linux_register_addr);
|
|
break;
|
|
default:
|
|
internal_error (__FILE__, __LINE__, "can't handle ABI");
|
|
break;
|
|
}
|
|
|
|
set_gdbarch_skip_solib_resolver (gdbarch, mips_linux_skip_resolver);
|
|
|
|
/* This overrides the MIPS16 stub support from mips-tdep. But no
|
|
one uses MIPS16 on GNU/Linux yet, so this isn't much of a loss. */
|
|
set_gdbarch_in_solib_call_trampoline (gdbarch, mips_linux_in_dynsym_stub);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
add_core_fns (®set_core_fns);
|
|
}
|