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| author | Carlos O'Donell <carlos@parisc-linux.org> | 2005-11-17 16:32:46 -0500 |
|---|---|---|
| committer | Kyle McMartin <kyle@parisc-linux.org> | 2005-11-17 16:32:46 -0500 |
| commit | aa0eecb07f27bea25a7cbe4150822be72493e574 (patch) | |
| tree | 59dc123caeffcc340ea0b6c90c9ff33de191b127 /arch/parisc/kernel/entry.S | |
| parent | 75be99a8c597aaebf82802109cdfd1249eea951e (diff) | |
| download | lwn-aa0eecb07f27bea25a7cbe4150822be72493e574.tar.gz lwn-aa0eecb07f27bea25a7cbe4150822be72493e574.zip | |
[PARISC] Document some register usages in assembly files
Document clobbers and args in entry.S and syscall.S.
entry.S: Add comment to indicate that cr27 may recycle and EDEADLOCK
detection is not 100% correct. Since this is only enabled when using
ENABLE_LWS_DEBUG, the user is warned by the comment.
Signed-off-by: Carlos O'Donell <carlos@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
Diffstat (limited to 'arch/parisc/kernel/entry.S')
| -rw-r--r-- | arch/parisc/kernel/entry.S | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S index c7e66ee5b083..9af4b22a6d77 100644 --- a/arch/parisc/kernel/entry.S +++ b/arch/parisc/kernel/entry.S @@ -1846,6 +1846,7 @@ sys_clone_wrapper: ldo -16(%r30),%r29 /* Reference param save area */ #endif + /* WARNING - Clobbers r19 and r21, userspace must save these! */ STREG %r2,PT_GR19(%r1) /* save for child */ STREG %r30,PT_GR21(%r1) BL sys_clone,%r2 |