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