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Signal unwinder for mips-irix N32. 

* mips-irix-tdep.c: #include mips-tdep.h, trad-frame.h, and
        tramp-frame.h.
        (SIGTRAMP_FRAME_SIZE, SIGCONTEXT_PC_OFF, SIGCONTEXT_REGS_OFF)
        (SIGCONTEXT_FPREGS_OFF, SIGCONTEXT_FPCSR_OFF, SIGCONTEXT_HI_OFF)
        (SIGCONTEXT_LO_OFF): New macros.
        (mips_irix_n32_tramp_frame_init): New function.
        (mips_irix_n32_tramp_frame): New static constant.
        (mips_irix_init_abi): Prepend the mips_irix_n32_tramp_frame unwinder.
This commit is contained in:
Joel Brobecker 2010-01-09 04:44:55 +00:00
parent 27087a3dc2
commit 6d8eadbddc
2 changed files with 164 additions and 1 deletions
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12
gdb/ChangeLog
View File

@ -1,3 +1,15 @@
2010-01-09 Joel Brobecker <brobecker@adacore.com>
Signal unwinder for mips-irix N32.
* mips-irix-tdep.c: #include mips-tdep.h, trad-frame.h, and
tramp-frame.h.
(SIGTRAMP_FRAME_SIZE, SIGCONTEXT_PC_OFF, SIGCONTEXT_REGS_OFF)
(SIGCONTEXT_FPREGS_OFF, SIGCONTEXT_FPCSR_OFF, SIGCONTEXT_HI_OFF)
(SIGCONTEXT_LO_OFF): New macros.
(mips_irix_n32_tramp_frame_init): New function.
(mips_irix_n32_tramp_frame): New static constant.
(mips_irix_init_abi): Prepend the mips_irix_n32_tramp_frame unwinder.
2010-01-09 Joel Brobecker <brobecker@adacore.com>
Breakpoint in shared library does not work on mips-irix.

153
gdb/mips-irix-tdep.c
View File

@ -23,8 +23,10 @@
#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,
@ -77,11 +79,160 @@ mips_irix_elf_osabi_sniffer (bfd *abfd)
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
};
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_tramp_frame);
}
/* Provide a prototype to silence -Wmissing-prototypes. */