43 lines
753 B
ArmAsm
43 lines
753 B
ArmAsm
|
.section .text
|
||
|
|
.intel_syntax noprefix
|
||
|
|
|
||
|
|
.extern _callee
|
||
|
|
|
||
|
|
/**
|
||
|
|
* void __cdecl dynamic_call(void *func, void *stack, size_t stacksize)
|
||
|
|
*/
|
||
|
|
.global dynamic_call
|
||
|
|
dynamic_call:
|
||
|
|
/* save everything except EAX, ECX, EDX */
|
||
|
|
push ebx
|
||
|
|
push esi
|
||
|
|
push edi
|
||
|
|
|
||
|
|
/* setup call */
|
||
|
|
mov ebx, [esp+0x18] /* stacksize */
|
||
|
|
mov eax, [esp+0x10] /* function */
|
||
|
|
mov esi /* src */, [esp+0x14] /* stackptr */
|
||
|
|
|
||
|
|
sub esp, ebx /* adjust stack pointer for call */
|
||
|
|
mov edi /* dst */, esp
|
||
|
|
mov ecx /* num */, ebx
|
||
|
|
|
||
|
|
/* jump to label if we don't need to copy anything */
|
||
|
|
cmp ebx, 0x00
|
||
|
|
jz label
|
||
|
|
|
||
|
|
/* copy virtual stack data */
|
||
|
|
cld
|
||
|
|
rep movsb
|
||
|
|
|
||
|
|
label:
|
||
|
|
/* call function and restore stack */
|
||
|
|
call eax
|
||
|
|
add esp, ebx /* ebx = stacksize */
|
||
|
|
|
||
|
|
/* clean up */
|
||
|
|
pop edi
|
||
|
|
pop esi
|
||
|
|
pop ebx
|
||
|
|
ret
|