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authorHelge Deller <deller@gmx.de>2018-08-05 00:03:29 +0200
committerHelge Deller <deller@gmx.de>2018-08-13 09:54:17 +0200
commitc8921d72e390cb6fca3fb2b0c2badfda851647eb (patch)
tree8c6aec1a9405da9caad70088a7dfd910b71b6675 /arch/parisc/lib/lusercopy.S
parentparisc: Remove unnecessary barriers from spinlock.h (diff)
downloadlinux-dev-c8921d72e390cb6fca3fb2b0c2badfda851647eb.tar.xz
linux-dev-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 '')
-rw-r--r--arch/parisc/lib/lusercopy.S21
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