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Fix regression for gdb.cp/gdb2495.exp with gcc-4.7.
	* arch-utils.c (displaced_step_at_entry_point): Incrase BP_LEN skip to
	3 times.
	* infcall.c (call_function_by_hand) <AT_SYMBOL>: Move it upwards and
	fall through into AT_ENTRY_POINT.
	(call_function_by_hand) <AT_ENTRY_POINT>: New variable bp_len.  Adjust
	DUMMY_ADDR with it.
	* ppc-linux-tdep.c (ppc_linux_displaced_step_location): Increase
	PPC_INSN_SIZE skip to 3 times.
This commit is contained in:
Jan Kratochvil 2012-01-02 02:52:20 +00:00
parent 8da828f760
commit b5914469f9
4 changed files with 47 additions and 17 deletions
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13
gdb/ChangeLog
View File

@ -1,3 +1,16 @@
2012-01-02 Jan Kratochvil <jan.kratochvil@redhat.com>
Joel Brobecker <brobecker@adacore.com>
Fix regression for gdb.cp/gdb2495.exp with gcc-4.7.
* arch-utils.c (displaced_step_at_entry_point): Incrase BP_LEN skip to
3 times.
* infcall.c (call_function_by_hand) <AT_SYMBOL>: Move it upwards and
fall through into AT_ENTRY_POINT.
(call_function_by_hand) <AT_ENTRY_POINT>: New variable bp_len. Adjust
DUMMY_ADDR with it.
* ppc-linux-tdep.c (ppc_linux_displaced_step_location): Increase
PPC_INSN_SIZE skip to 3 times.
2012-01-02 Jan Kratochvil <jan.kratochvil@redhat.com>
* amd64-linux-nat.c (update_debug_registers_callback): New comment on

2
gdb/arch-utils.c
View File

@ -86,7 +86,7 @@ displaced_step_at_entry_point (struct gdbarch *gdbarch)
We don't want displaced stepping to interfere with those
breakpoints, so leave space. */
gdbarch_breakpoint_from_pc (gdbarch, &addr, &bp_len);
addr += bp_len * 2;
addr += bp_len * 3;
return addr;
}

47
gdb/infcall.c
View File

@ -631,17 +631,6 @@ call_function_by_hand (struct value *function, int nargs, struct value **args)
args, nargs, target_values_type,
&real_pc, &bp_addr, get_current_regcache ());
break;
case AT_ENTRY_POINT:
{
CORE_ADDR dummy_addr;
real_pc = funaddr;
dummy_addr = entry_point_address ();
/* A call dummy always consists of just a single breakpoint, so
its address is the same as the address of the dummy. */
bp_addr = dummy_addr;
break;
}
case AT_SYMBOL:
/* Some executables define a symbol __CALL_DUMMY_ADDRESS whose
address is the location where the breakpoint should be
@ -661,11 +650,39 @@ call_function_by_hand (struct value *function, int nargs, struct value **args)
dummy_addr = gdbarch_convert_from_func_ptr_addr (gdbarch,
dummy_addr,
&current_target);
/* A call dummy always consists of just a single breakpoint,
so its address is the same as the address of the dummy. */
bp_addr = dummy_addr;
break;
}
else
dummy_addr = entry_point_address ();
/* A call dummy always consists of just a single breakpoint,
so it's address is the same as the address of the dummy. */
}
/* FALLTHROUGH */
case AT_ENTRY_POINT:
{
CORE_ADDR dummy_addr;
int bp_len;
real_pc = funaddr;
dummy_addr = entry_point_address ();
/* If the inferior call throws an uncaught C++ exception,
the inferior unwinder tries to unwind all frames, including
our dummy frame. The unwinder determines the address of
the calling instruction by subtracting 1 to the return
address. So, using the entry point's address as the return
address would lead the unwinder to use the unwinding
information of the code immediately preceding the entry
point. This information, if found, is invalid for the dummy
frame, and can potentially crash the inferior's unwinder.
Therefore, we adjust the return address by the length of
a breakpoint, guaranteeing that the unwinder finds the
correct function as the caller. */
gdbarch_breakpoint_from_pc (gdbarch, &dummy_addr, &bp_len);
dummy_addr += bp_len;
/* A call dummy always consists of just a single breakpoint, so
its address is the same as the address of the dummy. */
bp_addr = dummy_addr;
break;
}

2
gdb/ppc-linux-tdep.c
View File

@ -1075,7 +1075,7 @@ ppc_linux_displaced_step_location (struct gdbarch *gdbarch)
/* Inferior calls also use the entry point as a breakpoint location.
We don't want displaced stepping to interfere with those
breakpoints, so leave space. */
ppc_linux_entry_point_addr = addr + 2 * PPC_INSN_SIZE;
ppc_linux_entry_point_addr = addr + 3 * PPC_INSN_SIZE;
}
return ppc_linux_entry_point_addr;