summaryrefslogtreecommitdiff
path: root/arch/x86/um/stub_32.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/um/stub_32.S')
-rw-r--r--arch/x86/um/stub_32.S17
1 files changed, 11 insertions, 6 deletions
diff --git a/arch/x86/um/stub_32.S b/arch/x86/um/stub_32.S
index a193e88536a9..8291899e6aaf 100644
--- a/arch/x86/um/stub_32.S
+++ b/arch/x86/um/stub_32.S
@@ -5,21 +5,22 @@
.globl batch_syscall_stub
batch_syscall_stub:
- /* load pointer to first operation */
- mov $(STUB_DATA+8), %esp
-
+ /* %esp comes in as "top of page" */
+ mov %esp, %ecx
+ /* %esp has pointer to first operation */
+ add $8, %esp
again:
/* load length of additional data */
mov 0x0(%esp), %eax
/* if(length == 0) : end of list */
/* write possible 0 to header */
- mov %eax, STUB_DATA+4
+ mov %eax, 0x4(%ecx)
cmpl $0, %eax
jz done
/* save current pointer */
- mov %esp, STUB_DATA+4
+ mov %esp, 0x4(%ecx)
/* skip additional data */
add %eax, %esp
@@ -38,6 +39,10 @@ again:
/* execute syscall */
int $0x80
+ /* restore top of page pointer in %ecx */
+ mov %esp, %ecx
+ andl $(~UM_KERN_PAGE_SIZE) + 1, %ecx
+
/* check return value */
pop %ebx
cmp %ebx, %eax
@@ -45,7 +50,7 @@ again:
done:
/* save return value */
- mov %eax, STUB_DATA
+ mov %eax, (%ecx)
/* stop */
int3