diff options
Diffstat (limited to 'arch/um/sys-i386/stub.S')
| -rw-r--r-- | arch/um/sys-i386/stub.S | 42 |
1 files changed, 34 insertions, 8 deletions
diff --git a/arch/um/sys-i386/stub.S b/arch/um/sys-i386/stub.S index a0f9506312d1..6a70d9ab5c29 100644 --- a/arch/um/sys-i386/stub.S +++ b/arch/um/sys-i386/stub.S @@ -2,24 +2,50 @@ .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 $(UML_CONFIG_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, UML_CONFIG_STUB_DATA+4 cmpl $0, %eax jz done + + /* save current pointer */ + mov %esp, UML_CONFIG_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, UML_CONFIG_STUB_DATA - jmp again -done: int3 + + /* stop */ + int3 |