-#include "uml-config.h"
+#include "as-layout.h"
.globl syscall_stub
.section .__syscall_stub, "x"
-syscall_stub:
- int $0x80
- mov %eax, UML_CONFIG_STUB_DATA
- int3
.globl batch_syscall_stub
batch_syscall_stub:
- mov $UML_CONFIG_STUB_DATA, %esp
-again: pop %eax
+ /* load pointer to first operation */
+ mov $(STUB_DATA+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
cmpl $0, %eax
jz done
+
+ /* save current pointer */
+ mov %esp, STUB_DATA+4
+
+ /* skip additional data */
+ add %eax, %esp
+
+ /* load syscall-# */
+ pop %eax
+
+ /* load syscall params */
pop %ebx
pop %ecx
pop %edx
pop %esi
pop %edi
pop %ebp
+
+ /* execute syscall */
int $0x80
- mov %eax, UML_CONFIG_STUB_DATA
- jmp again
-done: int3
+
+ /* check return value */
+ pop %ebx
+ cmp %ebx, %eax
+ je again
+
+done:
+ /* save return value */
+ mov %eax, STUB_DATA
+
+ /* stop */
+ int3