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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [gdb/] [mips-irix-tdep.c] - Blame information for rev 834

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1 227 jeremybenn
/* Target-dependent code for the MIPS architecture running on IRIX,
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   for GDB, the GNU Debugger.
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   Copyright (C) 2002, 2007, 2008, 2009, 2010 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 3 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, see <http://www.gnu.org/licenses/>.  */
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#include "defs.h"
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#include "osabi.h"
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#include "gdb_string.h"
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#include "solib.h"
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#include "solib-irix.h"
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#include "elf-bfd.h"
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#include "mips-tdep.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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static void
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mips_irix_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect,
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                                            void *obj)
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{
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  enum gdb_osabi *os_ident_ptr = obj;
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  const char *name;
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  unsigned int sectsize;
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  name = bfd_get_section_name (abfd, sect);
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  sectsize = bfd_section_size (abfd, sect);
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  if (strncmp (name, ".MIPS.", 6) == 0 && sectsize > 0)
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    {
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      /* The presence of a section named with a ".MIPS." prefix is
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         indicative of an IRIX binary.  */
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      *os_ident_ptr = GDB_OSABI_IRIX;
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    }
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}
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static enum gdb_osabi
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mips_irix_elf_osabi_sniffer (bfd *abfd)
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{
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  unsigned int elfosabi;
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  enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
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  /* If the generic sniffer gets a hit, return and let other sniffers
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     get a crack at it.  */
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  bfd_map_over_sections (abfd,
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                         generic_elf_osabi_sniff_abi_tag_sections,
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                         &osabi);
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  if (osabi != GDB_OSABI_UNKNOWN)
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    return GDB_OSABI_UNKNOWN;
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  elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
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  if (elfosabi == ELFOSABI_NONE)
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    {
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      /* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
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         file are conforming to the base specification for that machine
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         (there are no OS-specific extensions).  In order to determine the
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         real OS in use we must look for OS notes that have been added.
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         For IRIX, we simply look for sections named with .MIPS. as
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         prefixes.  */
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      bfd_map_over_sections (abfd,
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                             mips_irix_elf_osabi_sniff_abi_tag_sections,
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                             &osabi);
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    }
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  return osabi;
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}
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/* Unwinding past the signal handler on mips-irix.
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84
   Note: The following has only been tested with N32, but can probably
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         be made to work with a small number of adjustments.
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   On mips-irix, the sigcontext_t structure is stored at the base
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   of the frame established by the _sigtramp function.  The definition
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   of this structure can be found in <sys/signal.h> (comments have been
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   C++'ified to avoid a collision with the C-style comment delimiters
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   used by this comment):
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      typedef struct sigcontext {
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        __uint32_t      sc_regmask;     // regs to restore in sigcleanup
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        __uint32_t      sc_status;      // cp0 status register
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        __uint64_t      sc_pc;          // pc at time of signal
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        // General purpose registers
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        __uint64_t      sc_regs[32];    // processor regs 0 to 31
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        // Floating point coprocessor state
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        __uint64_t      sc_fpregs[32];  // fp regs 0 to 31
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        __uint32_t      sc_ownedfp;     // fp has been used
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        __uint32_t      sc_fpc_csr;     // fpu control and status reg
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        __uint32_t      sc_fpc_eir;     // fpu exception instruction reg
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                                        // implementation/revision
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        __uint32_t      sc_ssflags;     // signal stack state to restore
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        __uint64_t      sc_mdhi;        // Multiplier hi and low regs
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        __uint64_t      sc_mdlo;
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        // System coprocessor registers at time of signal
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        __uint64_t      sc_cause;       // cp0 cause register
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        __uint64_t      sc_badvaddr;    // cp0 bad virtual address
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        __uint64_t      sc_triggersave; // state of graphics trigger (SGI)
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        sigset_t        sc_sigset;      // signal mask to restore
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        __uint64_t      sc_fp_rounded_result;   // for Ieee 754 support
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        __uint64_t      sc_pad[31];
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      } sigcontext_t;
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117
   The following macros provide the offset of some of the fields
118
   used to retrieve the value of the registers before the signal
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   was raised.  */
120
 
121
/* The size of the sigtramp frame.  The sigtramp frame base can then
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   be computed by adding this size to the SP.  */
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#define SIGTRAMP_FRAME_SIZE 48
124
/* The offset in sigcontext_t where the PC is saved.  */
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#define SIGCONTEXT_PC_OFF 8
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/* The offset in sigcontext_t where the GP registers are saved.  */
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#define SIGCONTEXT_REGS_OFF (SIGCONTEXT_PC_OFF + 8)
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/* The offset in sigcontext_t where the FP regsiters are saved.  */
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#define SIGCONTEXT_FPREGS_OFF (SIGCONTEXT_REGS_OFF + 32 * 8)
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/* The offset in sigcontext_t where the FP CSR register is saved.  */
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#define SIGCONTEXT_FPCSR_OFF (SIGCONTEXT_FPREGS_OFF + 32 * 8 + 4)
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/* The offset in sigcontext_t where the multiplier hi register is saved.  */
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#define SIGCONTEXT_HI_OFF (SIGCONTEXT_FPCSR_OFF + 2 * 4)
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/* The offset in sigcontext_t where the multiplier lo register is saved.  */
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#define SIGCONTEXT_LO_OFF (SIGCONTEXT_HI_OFF + 4)
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137
/* Implement the "init" routine in struct tramp_frame for the N32 ABI
138
   on mips-irix.  */
139
static void
140
mips_irix_n32_tramp_frame_init (const struct tramp_frame *self,
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                                struct frame_info *this_frame,
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                                struct trad_frame_cache *this_cache,
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                                CORE_ADDR func)
144
{
145
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
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  const int num_regs = gdbarch_num_regs (gdbarch);
147
  int sp_cooked_regno = num_regs + MIPS_SP_REGNUM;
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  const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno);
149
  const CORE_ADDR sigcontext_base = sp + 48;
150
  const struct mips_regnum *regs = mips_regnum (gdbarch);
151
  int ireg;
152
 
153
  trad_frame_set_reg_addr (this_cache, regs->pc + gdbarch_num_regs (gdbarch),
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                           sigcontext_base + SIGCONTEXT_PC_OFF);
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156
  for (ireg = 1; ireg < 32; ireg++)
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    trad_frame_set_reg_addr (this_cache, ireg + MIPS_ZERO_REGNUM + num_regs,
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                             sigcontext_base + SIGCONTEXT_REGS_OFF + ireg * 8);
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  for (ireg = 0; ireg < 32; ireg++)
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    trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + num_regs,
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                             sigcontext_base + SIGCONTEXT_FPREGS_OFF
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                               + ireg * 8);
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165
  trad_frame_set_reg_addr (this_cache, regs->fp_control_status + num_regs,
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                           sigcontext_base + SIGCONTEXT_FPCSR_OFF);
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168
  trad_frame_set_reg_addr (this_cache, regs->hi + num_regs,
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                           sigcontext_base + SIGCONTEXT_HI_OFF);
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171
  trad_frame_set_reg_addr (this_cache, regs->lo + num_regs,
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                           sigcontext_base + SIGCONTEXT_LO_OFF);
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174
  trad_frame_set_id (this_cache, frame_id_build (sigcontext_base, func));
175
}
176
 
177
/* The tramp_frame structure describing sigtramp frames on mips-irix N32.
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179
   Note that the list of instructions below is pretty much a pure dump
180
   of function _sigtramp on mips-irix.  A few instructions are actually
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   not tested (mask set to 0), because a portion of these instructions
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   contain an address which changes due to relocation.  We could use
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   a smarter mask that checks the instrutction code alone, but given
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   the number of instructions already being checked, this seemed
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   unnecessary.  */
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187
static const struct tramp_frame mips_irix_n32_tramp_frame =
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{
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  SIGTRAMP_FRAME,
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  4,
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  {
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   { 0x3c0c8000, -1 }, /*    lui     t0,0x8000 */
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   { 0x27bdffd0, -1 }, /*    addiu   sp,sp,-48 */
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   { 0x008c6024, -1 }, /*    and     t0,a0,t0 */
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   { 0xffa40018, -1 }, /*    sd      a0,24(sp) */
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   { 0x00000000,  0 }, /*    beqz    t0,0xfaefcb8 <_sigtramp+40> */
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   { 0xffa60028, -1 }, /*    sd      a2,40(sp) */
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   { 0x01806027, -1 }, /*    nor     t0,t0,zero */
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   { 0xffa00020, -1 }, /*    sd      zero,32(sp) */
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   { 0x00000000,  0 }, /*    b       0xfaefcbc <_sigtramp+44> */
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   { 0x008c2024, -1 }, /*    and     a0,a0,t0 */
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   { 0xffa60020, -1 }, /*    sd      a2,32(sp) */
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   { 0x03e0c025, -1 }, /*    move    t8,ra */
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   { 0x00000000,  0 }, /*    bal     0xfaefcc8 <_sigtramp+56> */
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   { 0x00000000, -1 }, /*    nop */
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   { 0x3c0c0007, -1 }, /*    lui     t0,0x7 */
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   { 0x00e0c825, -1 }, /*    move    t9,a3 */
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   { 0x658c80fc, -1 }, /*    daddiu  t0,t0,-32516 */
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   { 0x019f602d, -1 }, /*    daddu   t0,t0,ra */
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   { 0x0300f825, -1 }, /*    move    ra,t8 */
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   { 0x8d8c9880, -1 }, /*    lw      t0,-26496(t0) */
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   { 0x8d8c0000, -1 }, /*    lw      t0,0(t0) */
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   { 0x8d8d0000, -1 }, /*    lw      t1,0(t0) */
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   { 0xffac0008, -1 }, /*    sd      t0,8(sp) */
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   { 0x0320f809, -1 }, /*    jalr    t9 */
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   { 0xffad0010, -1 }, /*    sd      t1,16(sp) */
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   { 0xdfad0010, -1 }, /*    ld      t1,16(sp) */
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   { 0xdfac0008, -1 }, /*    ld      t0,8(sp) */
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   { 0xad8d0000, -1 }, /*    sw      t1,0(t0) */
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   { 0xdfa40020, -1 }, /*    ld      a0,32(sp) */
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   { 0xdfa50028, -1 }, /*    ld      a1,40(sp) */
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   { 0xdfa60018, -1 }, /*    ld      a2,24(sp) */
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   { 0x24020440, -1 }, /*    li      v0,1088 */
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   { 0x0000000c, -1 }, /*    syscall */
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   { TRAMP_SENTINEL_INSN, -1 }
226
  },
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  mips_irix_n32_tramp_frame_init
228
};
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230
static void
231
mips_irix_init_abi (struct gdbarch_info info,
232
                    struct gdbarch *gdbarch)
233
{
234
  set_solib_ops (gdbarch, &irix_so_ops);
235
  tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_tramp_frame);
236
}
237
 
238
/* Provide a prototype to silence -Wmissing-prototypes.  */
239
extern initialize_file_ftype _initialize_mips_irix_tdep;
240
 
241
void
242
_initialize_mips_irix_tdep (void)
243
{
244
  /* Register an ELF OS ABI sniffer for IRIX binaries.  */
245
  gdbarch_register_osabi_sniffer (bfd_arch_mips,
246
                                  bfd_target_elf_flavour,
247
                                  mips_irix_elf_osabi_sniffer);
248
 
249
  gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_IRIX,
250
                          mips_irix_init_abi);
251
}

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