diff options
Diffstat (limited to 'kernel/arch/x86/um/stub_32.S')
| -rw-r--r-- | kernel/arch/x86/um/stub_32.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/kernel/arch/x86/um/stub_32.S b/kernel/arch/x86/um/stub_32.S new file mode 100644 index 000000000..b972649d3 --- /dev/null +++ b/kernel/arch/x86/um/stub_32.S @@ -0,0 +1,51 @@ +#include <as-layout.h> + + .globl syscall_stub +.section .__syscall_stub, "ax" + + .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 |