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2008-12-05 Tristan Gingold <gingold@adacore.com>

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* i386-darwin-tdep.c (darwin_sigtramp_p): New function.
	(i386_darwin_sigcontext_addr): Ditto.
	(amd64_darwin_sigcontext_addr): Ditto.
	(darwin_dwarf_signal_frame_p): Ditto.
	(i386_darwin_init_abi): Handle signal frames, use the const for
	sc_num_regs.
	(x86_darwin_init_abi_64): Ditto.
This commit is contained in:
Tristan Gingold 2009-02-04 15:10:50 +00:00
parent 4bd207efc8
commit 9f08ae4f53
2 changed files with 79 additions and 5 deletions
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9
gdb/ChangeLog
View File

@ -1,3 +1,12 @@
2009-02-04 Tristan Gingold <gingold@adacore.com>
* i386-darwin-tdep.c (i386_darwin_sigcontext_addr): New function.
(amd64_darwin_sigcontext_addr): Ditto.
(darwin_dwarf_signal_frame_p): Ditto.
(i386_darwin_init_abi): Handle signal frames, use the const for
sc_num_regs.
(x86_darwin_init_abi_64): Ditto.
2009-02-04 Tristan Gingold <gingold@adacore.com>
* i386-tdep.c (i386_sigtramp_p): Make it public.

75
gdb/i386-darwin-tdep.c
View File

@ -41,6 +41,7 @@
#include "i386-darwin-tdep.h"
#include "solib.h"
#include "solib-darwin.h"
#include "dwarf2-frame.h"
/* Offsets into the struct i386_thread_state where we'll find the saved regs.
From <mach/i386/thread_status.h> and i386-tdep.h. */
@ -100,6 +101,65 @@ int amd64_darwin_thread_state_reg_offset[] =
const int amd64_darwin_thread_state_num_regs =
ARRAY_SIZE (amd64_darwin_thread_state_reg_offset);
/* Assuming THIS_FRAME is a Darwin sigtramp routine, return the
address of the associated sigcontext structure. */
static CORE_ADDR
i386_darwin_sigcontext_addr (struct frame_info *this_frame)
{
CORE_ADDR bp;
CORE_ADDR si;
gdb_byte buf[4];
get_frame_register (this_frame, I386_EBP_REGNUM, buf);
bp = extract_unsigned_integer (buf, 4);
/* A pointer to the ucontext is passed as the fourth argument
to the signal handler. */
read_memory (bp + 24, buf, 4);
si = extract_unsigned_integer (buf, 4);
/* The pointer to mcontext is at offset 28. */
read_memory (si + 28, buf, 4);
/* First register (eax) is at offset 12. */
return extract_unsigned_integer (buf, 4) + 12;
}
static CORE_ADDR
amd64_darwin_sigcontext_addr (struct frame_info *this_frame)
{
CORE_ADDR rbx;
CORE_ADDR si;
gdb_byte buf[8];
/* A pointer to the ucontext is passed as the fourth argument
to the signal handler, which is saved in rbx. */
get_frame_register (this_frame, AMD64_RBX_REGNUM, buf);
rbx = extract_unsigned_integer (buf, 8);
/* The pointer to mcontext is at offset 48. */
read_memory (rbx + 48, buf, 8);
/* First register (rax) is at offset 16. */
return extract_unsigned_integer (buf, 8) + 16;
}
/* Return true if the PC of THIS_FRAME is in a signal trampoline which
may have DWARF-2 CFI.
On Darwin, signal trampolines have DWARF-2 CFI but it has only one FDE
that covers only the indirect call to the user handler.
Without this function, the frame is recognized as a normal frame which is
not expected. */
static int
darwin_dwarf_signal_frame_p (struct gdbarch *gdbarch,
struct frame_info *this_frame)
{
return i386_sigtramp_p (this_frame);
}
static void
i386_darwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
@ -109,11 +169,14 @@ i386_darwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
tdep->num_xmm_regs = I386_NUM_XREGS - 1;
set_gdbarch_num_regs (gdbarch, I386_SSE_NUM_REGS);
dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p);
tdep->struct_return = reg_struct_return;
tdep->sigcontext_addr = NULL;
tdep->sigtramp_p = i386_sigtramp_p;
tdep->sigcontext_addr = i386_darwin_sigcontext_addr;
tdep->sc_reg_offset = i386_darwin_thread_state_reg_offset;
tdep->sc_num_regs = 16;
tdep->sc_num_regs = i386_darwin_thread_state_num_regs;
tdep->jb_pc_offset = 20;
@ -129,10 +192,12 @@ x86_darwin_init_abi_64 (struct gdbarch_info info, struct gdbarch *gdbarch)
tdep->struct_return = reg_struct_return;
/* We don't do signals yet. */
tdep->sigcontext_addr = NULL;
dwarf2_frame_set_signal_frame_p (gdbarch, darwin_dwarf_signal_frame_p);
tdep->sigtramp_p = i386_sigtramp_p;
tdep->sigcontext_addr = amd64_darwin_sigcontext_addr;
tdep->sc_reg_offset = amd64_darwin_thread_state_reg_offset;
tdep->sc_num_regs = ARRAY_SIZE (amd64_darwin_thread_state_reg_offset);
tdep->sc_num_regs = amd64_darwin_thread_state_num_regs;
tdep->jb_pc_offset = 148;