mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-25 19:14:52 +08:00
292 lines
11 KiB
C
292 lines
11 KiB
C
/* Target-dependent code for the MIPS architecture running on IRIX,
|
|
for GDB, the GNU Debugger.
|
|
|
|
Copyright (C) 2002, 2007-2012 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 3 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, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "defs.h"
|
|
#include "osabi.h"
|
|
#include "gdb_string.h"
|
|
#include "solib.h"
|
|
#include "solib-irix.h"
|
|
#include "elf-bfd.h"
|
|
#include "mips-tdep.h"
|
|
#include "trad-frame.h"
|
|
#include "tramp-frame.h"
|
|
|
|
static void
|
|
mips_irix_elf_osabi_sniff_abi_tag_sections (bfd *abfd, asection *sect,
|
|
void *obj)
|
|
{
|
|
enum gdb_osabi *os_ident_ptr = obj;
|
|
const char *name;
|
|
unsigned int sectsize;
|
|
|
|
name = bfd_get_section_name (abfd, sect);
|
|
sectsize = bfd_section_size (abfd, sect);
|
|
|
|
if (strncmp (name, ".MIPS.", 6) == 0 && sectsize > 0)
|
|
{
|
|
/* The presence of a section named with a ".MIPS." prefix is
|
|
indicative of an IRIX binary. */
|
|
*os_ident_ptr = GDB_OSABI_IRIX;
|
|
}
|
|
}
|
|
|
|
static enum gdb_osabi
|
|
mips_irix_elf_osabi_sniffer (bfd *abfd)
|
|
{
|
|
unsigned int elfosabi;
|
|
enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
|
|
|
|
/* If the generic sniffer gets a hit, return and let other sniffers
|
|
get a crack at it. */
|
|
bfd_map_over_sections (abfd,
|
|
generic_elf_osabi_sniff_abi_tag_sections,
|
|
&osabi);
|
|
if (osabi != GDB_OSABI_UNKNOWN)
|
|
return GDB_OSABI_UNKNOWN;
|
|
|
|
elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
|
|
|
|
if (elfosabi == ELFOSABI_NONE)
|
|
{
|
|
/* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
|
|
file are conforming to the base specification for that machine
|
|
(there are no OS-specific extensions). In order to determine the
|
|
real OS in use we must look for OS notes that have been added.
|
|
|
|
For IRIX, we simply look for sections named with .MIPS. as
|
|
prefixes. */
|
|
bfd_map_over_sections (abfd,
|
|
mips_irix_elf_osabi_sniff_abi_tag_sections,
|
|
&osabi);
|
|
}
|
|
return osabi;
|
|
}
|
|
|
|
/* Unwinding past the signal handler on mips-irix.
|
|
|
|
Note: The following has only been tested with N32, but can probably
|
|
be made to work with a small number of adjustments.
|
|
|
|
On mips-irix, the sigcontext_t structure is stored at the base
|
|
of the frame established by the _sigtramp function. The definition
|
|
of this structure can be found in <sys/signal.h> (comments have been
|
|
C++'ified to avoid a collision with the C-style comment delimiters
|
|
used by this comment):
|
|
|
|
typedef struct sigcontext {
|
|
__uint32_t sc_regmask; // regs to restore in sigcleanup
|
|
__uint32_t sc_status; // cp0 status register
|
|
__uint64_t sc_pc; // pc at time of signal
|
|
// General purpose registers
|
|
__uint64_t sc_regs[32]; // processor regs 0 to 31
|
|
// Floating point coprocessor state
|
|
__uint64_t sc_fpregs[32]; // fp regs 0 to 31
|
|
__uint32_t sc_ownedfp; // fp has been used
|
|
__uint32_t sc_fpc_csr; // fpu control and status reg
|
|
__uint32_t sc_fpc_eir; // fpu exception instruction reg
|
|
// implementation/revision
|
|
__uint32_t sc_ssflags; // signal stack state to restore
|
|
__uint64_t sc_mdhi; // Multiplier hi and low regs
|
|
__uint64_t sc_mdlo;
|
|
// System coprocessor registers at time of signal
|
|
__uint64_t sc_cause; // cp0 cause register
|
|
__uint64_t sc_badvaddr; // cp0 bad virtual address
|
|
__uint64_t sc_triggersave; // state of graphics trigger (SGI)
|
|
sigset_t sc_sigset; // signal mask to restore
|
|
__uint64_t sc_fp_rounded_result; // for Ieee 754 support
|
|
__uint64_t sc_pad[31];
|
|
} sigcontext_t;
|
|
|
|
The following macros provide the offset of some of the fields
|
|
used to retrieve the value of the registers before the signal
|
|
was raised. */
|
|
|
|
/* The size of the sigtramp frame. The sigtramp frame base can then
|
|
be computed by adding this size to the SP. */
|
|
#define SIGTRAMP_FRAME_SIZE 48
|
|
/* The offset in sigcontext_t where the PC is saved. */
|
|
#define SIGCONTEXT_PC_OFF 8
|
|
/* The offset in sigcontext_t where the GP registers are saved. */
|
|
#define SIGCONTEXT_REGS_OFF (SIGCONTEXT_PC_OFF + 8)
|
|
/* The offset in sigcontext_t where the FP regsiters are saved. */
|
|
#define SIGCONTEXT_FPREGS_OFF (SIGCONTEXT_REGS_OFF + 32 * 8)
|
|
/* The offset in sigcontext_t where the FP CSR register is saved. */
|
|
#define SIGCONTEXT_FPCSR_OFF (SIGCONTEXT_FPREGS_OFF + 32 * 8 + 4)
|
|
/* The offset in sigcontext_t where the multiplier hi register is saved. */
|
|
#define SIGCONTEXT_HI_OFF (SIGCONTEXT_FPCSR_OFF + 2 * 4)
|
|
/* The offset in sigcontext_t where the multiplier lo register is saved. */
|
|
#define SIGCONTEXT_LO_OFF (SIGCONTEXT_HI_OFF + 4)
|
|
|
|
/* Implement the "init" routine in struct tramp_frame for the N32 ABI
|
|
on mips-irix. */
|
|
static void
|
|
mips_irix_n32_tramp_frame_init (const struct tramp_frame *self,
|
|
struct frame_info *this_frame,
|
|
struct trad_frame_cache *this_cache,
|
|
CORE_ADDR func)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
const int num_regs = gdbarch_num_regs (gdbarch);
|
|
int sp_cooked_regno = num_regs + MIPS_SP_REGNUM;
|
|
const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno);
|
|
const CORE_ADDR sigcontext_base = sp + 48;
|
|
const struct mips_regnum *regs = mips_regnum (gdbarch);
|
|
int ireg;
|
|
|
|
trad_frame_set_reg_addr (this_cache, regs->pc + gdbarch_num_regs (gdbarch),
|
|
sigcontext_base + SIGCONTEXT_PC_OFF);
|
|
|
|
for (ireg = 1; ireg < 32; ireg++)
|
|
trad_frame_set_reg_addr (this_cache, ireg + MIPS_ZERO_REGNUM + num_regs,
|
|
sigcontext_base + SIGCONTEXT_REGS_OFF + ireg * 8);
|
|
|
|
for (ireg = 0; ireg < 32; ireg++)
|
|
trad_frame_set_reg_addr (this_cache, ireg + regs->fp0 + num_regs,
|
|
sigcontext_base + SIGCONTEXT_FPREGS_OFF
|
|
+ ireg * 8);
|
|
|
|
trad_frame_set_reg_addr (this_cache, regs->fp_control_status + num_regs,
|
|
sigcontext_base + SIGCONTEXT_FPCSR_OFF);
|
|
|
|
trad_frame_set_reg_addr (this_cache, regs->hi + num_regs,
|
|
sigcontext_base + SIGCONTEXT_HI_OFF);
|
|
|
|
trad_frame_set_reg_addr (this_cache, regs->lo + num_regs,
|
|
sigcontext_base + SIGCONTEXT_LO_OFF);
|
|
|
|
trad_frame_set_id (this_cache, frame_id_build (sigcontext_base, func));
|
|
}
|
|
|
|
/* The tramp_frame structure describing sigtramp frames on mips-irix N32.
|
|
|
|
Note that the list of instructions below is pretty much a pure dump
|
|
of function _sigtramp on mips-irix. A few instructions are actually
|
|
not tested (mask set to 0), because a portion of these instructions
|
|
contain an address which changes due to relocation. We could use
|
|
a smarter mask that checks the instrutction code alone, but given
|
|
the number of instructions already being checked, this seemed
|
|
unnecessary. */
|
|
|
|
static const struct tramp_frame mips_irix_n32_tramp_frame =
|
|
{
|
|
SIGTRAMP_FRAME,
|
|
4,
|
|
{
|
|
{ 0x3c0c8000, -1 }, /* lui t0,0x8000 */
|
|
{ 0x27bdffd0, -1 }, /* addiu sp,sp,-48 */
|
|
{ 0x008c6024, -1 }, /* and t0,a0,t0 */
|
|
{ 0xffa40018, -1 }, /* sd a0,24(sp) */
|
|
{ 0x00000000, 0 }, /* beqz t0,0xfaefcb8 <_sigtramp+40> */
|
|
{ 0xffa60028, -1 }, /* sd a2,40(sp) */
|
|
{ 0x01806027, -1 }, /* nor t0,t0,zero */
|
|
{ 0xffa00020, -1 }, /* sd zero,32(sp) */
|
|
{ 0x00000000, 0 }, /* b 0xfaefcbc <_sigtramp+44> */
|
|
{ 0x008c2024, -1 }, /* and a0,a0,t0 */
|
|
{ 0xffa60020, -1 }, /* sd a2,32(sp) */
|
|
{ 0x03e0c025, -1 }, /* move t8,ra */
|
|
{ 0x00000000, 0 }, /* bal 0xfaefcc8 <_sigtramp+56> */
|
|
{ 0x00000000, -1 }, /* nop */
|
|
{ 0x3c0c0007, -1 }, /* lui t0,0x7 */
|
|
{ 0x00e0c825, -1 }, /* move t9,a3 */
|
|
{ 0x658c80fc, -1 }, /* daddiu t0,t0,-32516 */
|
|
{ 0x019f602d, -1 }, /* daddu t0,t0,ra */
|
|
{ 0x0300f825, -1 }, /* move ra,t8 */
|
|
{ 0x8d8c9880, -1 }, /* lw t0,-26496(t0) */
|
|
{ 0x8d8c0000, -1 }, /* lw t0,0(t0) */
|
|
{ 0x8d8d0000, -1 }, /* lw t1,0(t0) */
|
|
{ 0xffac0008, -1 }, /* sd t0,8(sp) */
|
|
{ 0x0320f809, -1 }, /* jalr t9 */
|
|
{ 0xffad0010, -1 }, /* sd t1,16(sp) */
|
|
{ 0xdfad0010, -1 }, /* ld t1,16(sp) */
|
|
{ 0xdfac0008, -1 }, /* ld t0,8(sp) */
|
|
{ 0xad8d0000, -1 }, /* sw t1,0(t0) */
|
|
{ 0xdfa40020, -1 }, /* ld a0,32(sp) */
|
|
{ 0xdfa50028, -1 }, /* ld a1,40(sp) */
|
|
{ 0xdfa60018, -1 }, /* ld a2,24(sp) */
|
|
{ 0x24020440, -1 }, /* li v0,1088 */
|
|
{ 0x0000000c, -1 }, /* syscall */
|
|
{ TRAMP_SENTINEL_INSN, -1 }
|
|
},
|
|
mips_irix_n32_tramp_frame_init
|
|
};
|
|
|
|
/* Implement the "init" routine in struct tramp_frame for the stack-based
|
|
trampolines used on mips-irix. */
|
|
|
|
static void
|
|
mips_irix_n32_stack_tramp_frame_init (const struct tramp_frame *self,
|
|
struct frame_info *this_frame,
|
|
struct trad_frame_cache *this_cache,
|
|
CORE_ADDR func)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
const int num_regs = gdbarch_num_regs (gdbarch);
|
|
int sp_cooked_regno = num_regs + MIPS_SP_REGNUM;
|
|
const CORE_ADDR sp = get_frame_register_signed (this_frame, sp_cooked_regno);
|
|
|
|
/* The previous frame's PC is stored in RA. */
|
|
trad_frame_set_reg_realreg (this_cache, gdbarch_pc_regnum (gdbarch),
|
|
num_regs + MIPS_RA_REGNUM);
|
|
|
|
trad_frame_set_id (this_cache, frame_id_build (sp, func));
|
|
}
|
|
|
|
/* A tramp_frame structure describing the stack-based trampoline
|
|
used on mips-irix. These trampolines are created on the stack
|
|
before being called. */
|
|
|
|
static const struct tramp_frame mips_irix_n32_stack_tramp_frame =
|
|
{
|
|
SIGTRAMP_FRAME,
|
|
4,
|
|
{
|
|
{ 0x8f210000, 0xffff0000 }, /* lw at, N(t9) */
|
|
{ 0x8f2f0000, 0xffff0000 }, /* lw t3, M(t9) */
|
|
{ 0x00200008, 0xffffffff }, /* jr at */
|
|
{ 0x0020c82d, 0xffffffff }, /* move t9, at */
|
|
{ TRAMP_SENTINEL_INSN, -1 }
|
|
},
|
|
mips_irix_n32_stack_tramp_frame_init
|
|
};
|
|
|
|
static void
|
|
mips_irix_init_abi (struct gdbarch_info info,
|
|
struct gdbarch *gdbarch)
|
|
{
|
|
set_solib_ops (gdbarch, &irix_so_ops);
|
|
tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_stack_tramp_frame);
|
|
tramp_frame_prepend_unwinder (gdbarch, &mips_irix_n32_tramp_frame);
|
|
}
|
|
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
|
extern initialize_file_ftype _initialize_mips_irix_tdep;
|
|
|
|
void
|
|
_initialize_mips_irix_tdep (void)
|
|
{
|
|
/* Register an ELF OS ABI sniffer for IRIX binaries. */
|
|
gdbarch_register_osabi_sniffer (bfd_arch_mips,
|
|
bfd_target_elf_flavour,
|
|
mips_irix_elf_osabi_sniffer);
|
|
|
|
gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_IRIX,
|
|
mips_irix_init_abi);
|
|
}
|