Merge git://git.infradead.org/mtd-2.6

[linux-2.6] / arch / um / sys-i386 / stub.S

diff --git a/arch/um/sys-i386/stub.S b/arch/um/sys-i386/stub.S
index 2f2c70a8f043440ef99f68c20332158292407972..7699e89f660fd42701736ce1bfe79e4d6b2d0ddc 100644 (file)
--- a/arch/um/sys-i386/stub.S
+++ b/arch/um/sys-i386/stub.S
@@ -1,8 +1,52 @@
 #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
+
+       .globl batch_syscall_stub
+batch_syscall_stub:
+       /* 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
+
+       /* check return value */
+       pop     %ebx
+       cmp     %ebx, %eax
+       je      again
+
+done:
+       /* save return value */
+       mov     %eax, STUB_DATA
+
+       /* stop */
        int3