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Detect the magic address of EXC_RETURN in ARM coretx-m profile

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On ARMv6-M and ARMv7-M, the exception return address is sort of magic
address defined by the manual.  This patch is to let GDB well handle
these magic addresses.

2016-09-27  Fredrik Hederstierna  <fredrik.hederstierna@verisure.com>

	* arm-tdep.c (arm_m_addr_is_magic): New function.
	(arm_addr_bits_remove): Call arm_m_addr_is_magic.
	(arm_m_exception_unwind_sniffer): Likewise.
This commit is contained in:
Fredrik Hederstierna 2016-09-27 02:02:47 +01:00 committed by Yao Qi
parent 83ae81cd0b
commit ca90e76046
2 changed files with 65 additions and 9 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2016-09-27 Fredrik Hederstierna <fredrik.hederstierna@verisure.com>
* arm-tdep.c (arm_m_addr_is_magic): New function.
(arm_addr_bits_remove): Call arm_m_addr_is_magic.
(arm_m_exception_unwind_sniffer): Likewise.
2016-09-23 Jon Turney <jon.turney@dronecode.org.uk>
* windows-nat.c (windows_delete_thread): Adjusting call to

68
gdb/arm-tdep.c
View File

@ -465,6 +465,62 @@ arm_pc_is_thumb (struct gdbarch *gdbarch, CORE_ADDR memaddr)
return 0;
}
/* Determine if the address specified equals any of these magic return
values, called EXC_RETURN, defined by the ARM v6-M and v7-M
architectures.
From ARMv6-M Reference Manual B1.5.8
Table B1-5 Exception return behavior
EXC_RETURN Return To Return Stack
0xFFFFFFF1 Handler mode Main
0xFFFFFFF9 Thread mode Main
0xFFFFFFFD Thread mode Process
From ARMv7-M Reference Manual B1.5.8
Table B1-8 EXC_RETURN definition of exception return behavior, no FP
EXC_RETURN Return To Return Stack
0xFFFFFFF1 Handler mode Main
0xFFFFFFF9 Thread mode Main
0xFFFFFFFD Thread mode Process
Table B1-9 EXC_RETURN definition of exception return behavior, with
FP
EXC_RETURN Return To Return Stack Frame Type
0xFFFFFFE1 Handler mode Main Extended
0xFFFFFFE9 Thread mode Main Extended
0xFFFFFFED Thread mode Process Extended
0xFFFFFFF1 Handler mode Main Basic
0xFFFFFFF9 Thread mode Main Basic
0xFFFFFFFD Thread mode Process Basic
For more details see "B1.5.8 Exception return behavior"
in both ARMv6-M and ARMv7-M Architecture Reference Manuals. */
static int
arm_m_addr_is_magic (CORE_ADDR addr)
{
switch (addr)
{
/* Values from Tables in B1.5.8 the EXC_RETURN definitions of
the exception return behavior. */
case 0xffffffe1:
case 0xffffffe9:
case 0xffffffed:
case 0xfffffff1:
case 0xfffffff9:
case 0xfffffffd:
/* Address is magic. */
return 1;
default:
/* Address is not magic. */
return 0;
}
}
/* Remove useless bits from addresses in a running program. */
static CORE_ADDR
arm_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val)
@ -472,7 +528,7 @@ arm_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR val)
/* On M-profile devices, do not strip the low bit from EXC_RETURN
(the magic exception return address). */
if (gdbarch_tdep (gdbarch)->is_m
&& (val & 0xfffffff0) == 0xfffffff0)
&& arm_m_addr_is_magic (val))
return val;
if (arm_apcs_32)
@ -2991,14 +3047,8 @@ arm_m_exception_unwind_sniffer (const struct frame_unwind *self,
/* No need to check is_m; this sniffer is only registered for
M-profile architectures. */
/* Exception frames return to one of these magic PCs. Other values
are not defined as of v7-M. See details in "B1.5.8 Exception
return behavior" in "ARMv7-M Architecture Reference Manual". */
if (this_pc == 0xfffffff1 || this_pc == 0xfffffff9
|| this_pc == 0xfffffffd)
return 1;
return 0;
/* Check if exception frame returns to a magic PC value. */
return arm_m_addr_is_magic (this_pc);
}
/* Frame unwinder for M-profile exceptions. */