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* [binutils-gdb] gdb/arm: Don't rely on loop detection to stop unwinding
@ 2022-10-15 9:40 Torbjorn Svensson
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From: Torbjorn Svensson @ 2022-10-15 9:40 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=619cce4cac9b7ad5f4604cd5a63933e71515e16f
commit 619cce4cac9b7ad5f4604cd5a63933e71515e16f
Author: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>
Date: Fri Oct 14 15:34:24 2022 +0200
gdb/arm: Don't rely on loop detection to stop unwinding
Setting SP of the next frame to the same address as the current frame
is an ugly way to stop the unwinding. A cleaner way is to rely on
the frame_unwind_stop_reason function to return UNWIND_OUTERMOST.
Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>
Diff:
---
gdb/arm-tdep.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index fa6b08e4a54..b5facae8a5e 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -3356,7 +3356,6 @@ arm_m_exception_cache (frame_info_ptr this_frame)
to the exception and if FPU is used (causing extended stack frame). */
CORE_ADDR lr = get_frame_register_unsigned (this_frame, ARM_LR_REGNUM);
- CORE_ADDR sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM);
/* ARMv7-M Architecture Reference "A2.3.1 Arm core registers"
states that LR is set to 0xffffffff on reset. ARMv8-M Architecture
@@ -3364,8 +3363,8 @@ arm_m_exception_cache (frame_info_ptr this_frame)
reset if Main Extension is implemented, otherwise the value is unknown. */
if (lr == 0xffffffff)
{
- /* Terminate any further stack unwinding by referring to self. */
- arm_cache_set_active_sp_value (cache, tdep, sp);
+ /* Terminate any further stack unwinding. */
+ arm_cache_set_active_sp_value (cache, tdep, 0);
return cache;
}
@@ -3387,8 +3386,8 @@ arm_m_exception_cache (frame_info_ptr this_frame)
{
warning (_("Non-secure to secure stack unwinding disabled."));
- /* Terminate any further stack unwinding by referring to self. */
- arm_cache_set_active_sp_value (cache, tdep, sp);
+ /* Terminate any further stack unwinding. */
+ arm_cache_set_active_sp_value (cache, tdep, 0);
return cache;
}
@@ -3452,8 +3451,8 @@ arm_m_exception_cache (frame_info_ptr this_frame)
{
warning (_("Non-secure to secure stack unwinding disabled."));
- /* Terminate any further stack unwinding by referring to self. */
- arm_cache_set_active_sp_value (cache, tdep, sp);
+ /* Terminate any further stack unwinding. */
+ arm_cache_set_active_sp_value (cache, tdep, 0);
return cache;
}
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