35 lines
1.3 KiB
ArmAsm
35 lines
1.3 KiB
ArmAsm
|
#include <sys/linux-syscalls.h>
|
||
|
|
|
||
|
|
.text
|
||
|
|
.type _exit_with_stack_teardown, @function
|
||
|
|
.globl _exit_with_stack_teardown
|
||
|
|
.align 4
|
||
|
|
|
||
|
|
/*
|
||
|
|
* void _exit_with_stack_teardown(void *stackBase, int stackSize, int *retCode)
|
||
|
|
*/
|
||
|
|
|
||
|
|
_exit_with_stack_teardown:
|
||
|
|
/* we can trash %ebx here since this call should never return. */
|
||
|
|
/* We can also take advantage of the fact that the linux syscall trap
|
||
|
|
* handler saves all the registers, so we don't need a stack to keep
|
||
|
|
* the retCode argument for exit while doing the munmap */
|
||
|
|
|
||
|
|
/* TODO(dmtriyz): No one expects this code to return, so even if
|
||
|
|
* munmap fails, we have to exit. This should probably be fixed, but
|
||
|
|
* since ARM side does the same thing, leave it as is.
|
||
|
|
*/
|
||
|
|
mov 4(%esp), %ebx /* stackBase */
|
||
|
|
mov 8(%esp), %ecx /* stackSize */
|
||
|
|
mov 12(%esp), %edx /* retCode, not used for munmap */
|
||
|
|
mov $__NR_munmap, %eax
|
||
|
|
int $0x80
|
||
|
|
mov %edx, %ebx /* retrieve the retCode */
|
||
|
|
movl $__NR_exit, %eax
|
||
|
|
int $0x80
|
||
|
|
/* exit does not return */
|
||
|
|
/* can't have a ret here since we no longer have a usable stack. Seems
|
||
|
|
* that presently, 'hlt' will cause the program to segfault.. but this
|
||
|
|
* should never happen :) */
|
||
|
|
hlt
|