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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-02-17 10:57:56 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-02-18 10:39:03 -0300 |
| commit | 6e05978f0c30e52420e086cc3156655471e6fb0a (patch) | |
| tree | 270ec2b2a14ec10a5f50cdc5adcac690d13e029e /debug | |
| parent | 631cf64bc1d8306e011ef39f60b8cb6de91bd271 (diff) | |
| download | glibc-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.c | 5 |
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); |