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authorAdhemerval Zanella <adhemerval.zanella@linaro.org>2020-02-17 10:57:56 -0300
committerAdhemerval Zanella <adhemerval.zanella@linaro.org>2020-02-18 10:39:03 -0300
commit6e05978f0c30e52420e086cc3156655471e6fb0a (patch)
tree270ec2b2a14ec10a5f50cdc5adcac690d13e029e /debug
parent631cf64bc1d8306e011ef39f60b8cb6de91bd271 (diff)
downloadglibc-6e05978f0c30e52420e086cc3156655471e6fb0a.tar.gz
mips: Fix bracktrace result for signal frames
MIPS fallback code handle a frame where its FDE can not be obtained (for instance a signal frame) by reading the kernel allocated signal frame and adding '2' to the value of 'sc_pc' [1]. The added value is used to recognize an end of an EH region on mips16 [2]. The fix adjust the obtained signal frame value and remove the libgcc added value by checking if the previous frame is a signal frame one. Checked with backtrace and tst-sigcontext-get_pc tests on mips-linux-gnu and mips64-linux-gnu. [1] libgcc/config/mips/linux-unwind.h from gcc code. [2] gcc/config/mips/mips.h from gcc code. */
Diffstat (limited to 'debug')
-rw-r--r--debug/backtrace.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/debug/backtrace.c b/debug/backtrace.c
index cc4b9a5c90..69cf4c23c8 100644
--- a/debug/backtrace.c
+++ b/debug/backtrace.c
@@ -23,6 +23,7 @@
#include <gnu/lib-names.h>
#include <stdlib.h>
#include <unwind.h>
+#include <unwind-arch.h>
struct trace_arg
{
@@ -78,6 +79,10 @@ backtrace_helper (struct _Unwind_Context *ctx, void *a)
if (arg->cnt != -1)
{
arg->array[arg->cnt] = (void *) unwind_getip (ctx);
+ if (arg->cnt > 0)
+ arg->array[arg->cnt]
+ = unwind_arch_adjustment (arg->array[arg->cnt - 1],
+ arg->array[arg->cnt]);
/* Check whether we make any progress. */
_Unwind_Word cfa = unwind_getcfa (ctx);