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| author | Helge Deller <deller@gmx.de> | 2018-08-05 00:03:29 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2018-08-13 09:54:17 +0200 |
| commit | c8921d72e390cb6fca3fb2b0c2badfda851647eb (patch) | |
| tree | 8c6aec1a9405da9caad70088a7dfd910b71b6675 /arch/parisc/lib | |
| parent | 3b885ac1dc35b87a39ee176a6c7e2af9c789d8b8 (diff) | |
| download | lwn-c8921d72e390cb6fca3fb2b0c2badfda851647eb.tar.gz lwn-c8921d72e390cb6fca3fb2b0c2badfda851647eb.zip | |
parisc: Fix and improve kernel stack unwinding
This patchset fixes and improves stack unwinding a lot:
1. Show backward stack traces with up to 30 callsites
2. Add callinfo to ENTRY_CFI() such that every assembler function will get an
entry in the unwind table
3. Use constants instead of numbers in call_on_stack()
4. Do not depend on CONFIG_KALLSYMS to generate backtraces.
5. Speed up backtrace generation
Make sure you have this patch to GNU as installed:
https://sourceware.org/ml/binutils/2018-07/msg00474.html
Without this patch, unwind info in the kernel is often wrong for various
functions.
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc/lib')
| -rw-r--r-- | arch/parisc/lib/lusercopy.S | 21 |
1 files changed, 0 insertions, 21 deletions
diff --git a/arch/parisc/lib/lusercopy.S b/arch/parisc/lib/lusercopy.S index d4fe19806d57..b53fb6fedf06 100644 --- a/arch/parisc/lib/lusercopy.S +++ b/arch/parisc/lib/lusercopy.S @@ -64,9 +64,6 @@ */ ENTRY_CFI(lclear_user) - .proc - .callinfo NO_CALLS - .entry comib,=,n 0,%r25,$lclu_done get_sr $lclu_loop: @@ -81,13 +78,9 @@ $lclu_done: ldo 1(%r25),%r25 ASM_EXCEPTIONTABLE_ENTRY(1b,2b) - - .exit ENDPROC_CFI(lclear_user) - .procend - /* * long lstrnlen_user(char *s, long n) * @@ -97,9 +90,6 @@ ENDPROC_CFI(lclear_user) */ ENTRY_CFI(lstrnlen_user) - .proc - .callinfo NO_CALLS - .entry comib,= 0,%r25,$lslen_nzero copy %r26,%r24 get_sr @@ -111,7 +101,6 @@ $lslen_loop: $lslen_done: bv %r0(%r2) sub %r26,%r24,%r28 - .exit $lslen_nzero: b $lslen_done @@ -125,9 +114,6 @@ $lslen_nzero: ENDPROC_CFI(lstrnlen_user) - .procend - - /* * unsigned long pa_memcpy(void *dstp, const void *srcp, unsigned long len) @@ -186,10 +172,6 @@ ENDPROC_CFI(lstrnlen_user) save_len = r31 ENTRY_CFI(pa_memcpy) - .proc - .callinfo NO_CALLS - .entry - /* Last destination address */ add dst,len,end @@ -439,9 +421,6 @@ ENTRY_CFI(pa_memcpy) b .Lcopy_done 10: stw,ma t1,4(dstspc,dst) ASM_EXCEPTIONTABLE_ENTRY(10b,.Lcopy_done) - - .exit ENDPROC_CFI(pa_memcpy) - .procend .end |