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authorAlexander Nyberg <alexn@telia.com>2005-04-21 07:59:51 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-21 07:59:51 -0700
commit3a6fd752a50af92765853879f4a11cc0cfcd0320 (patch)
treedc79d50fb8d8c74259945b8a044f93982a9289bd /arch/x86_64/lib
parent6d9c5d94d39a09d9b112613f0bfdb9af0e6dc253 (diff)
downloadlinux-linaro-stable-3a6fd752a50af92765853879f4a11cc0cfcd0320.tar.gz
[PATCH] x86_64: Bug in new out of line put_user()
The new out of line put_user() assembly on x86_64 changes %rcx without telling GCC about it causing things like: http://bugme.osdl.org/show_bug.cgi?id=4515 See to it that %rcx is not changed (made it consistent with get_user()). Signed-off-by: Alexander Nyberg <alexn@telia.com> Signed-off-by: ak@suse.de Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/lib')
-rw-r--r--arch/x86_64/lib/getuser.S4
-rw-r--r--arch/x86_64/lib/putuser.S27
2 files changed, 20 insertions, 11 deletions
diff --git a/arch/x86_64/lib/getuser.S b/arch/x86_64/lib/getuser.S
index f94ea8a44051..f80bafee8669 100644
--- a/arch/x86_64/lib/getuser.S
+++ b/arch/x86_64/lib/getuser.S
@@ -78,9 +78,9 @@ __get_user_4:
__get_user_8:
GET_THREAD_INFO(%r8)
addq $7,%rcx
- jc bad_get_user
+ jc 40f
cmpq threadinfo_addr_limit(%r8),%rcx
- jae bad_get_user
+ jae 40f
subq $7,%rcx
4: movq (%rcx),%rdx
xorl %eax,%eax
diff --git a/arch/x86_64/lib/putuser.S b/arch/x86_64/lib/putuser.S
index 0dee1fdcb162..d9d3e5ec9ad1 100644
--- a/arch/x86_64/lib/putuser.S
+++ b/arch/x86_64/lib/putuser.S
@@ -46,36 +46,45 @@ __put_user_1:
__put_user_2:
GET_THREAD_INFO(%r8)
addq $1,%rcx
- jc bad_put_user
+ jc 20f
cmpq threadinfo_addr_limit(%r8),%rcx
- jae bad_put_user
-2: movw %dx,-1(%rcx)
+ jae 20f
+2: decq %rcx
+ movw %dx,(%rcx)
xorl %eax,%eax
ret
+20: decq %rcx
+ jmp bad_put_user
.p2align 4
.globl __put_user_4
__put_user_4:
GET_THREAD_INFO(%r8)
addq $3,%rcx
- jc bad_put_user
+ jc 30f
cmpq threadinfo_addr_limit(%r8),%rcx
- jae bad_put_user
-3: movl %edx,-3(%rcx)
+ jae 30f
+3: subq $3,%rcx
+ movl %edx,(%rcx)
xorl %eax,%eax
ret
+30: subq $3,%rcx
+ jmp bad_put_user
.p2align 4
.globl __put_user_8
__put_user_8:
GET_THREAD_INFO(%r8)
addq $7,%rcx
- jc bad_put_user
+ jc 40f
cmpq threadinfo_addr_limit(%r8),%rcx
- jae bad_put_user
-4: movq %rdx,-7(%rcx)
+ jae 40f
+4: subq $7,%rcx
+ movq %rdx,(%rcx)
xorl %eax,%eax
ret
+40: subq $7,%rcx
+ jmp bad_put_user
bad_put_user:
movq $(-EFAULT),%rax