Martin Michelsen
43 lines
1.2 KiB
ArmAsm
43 lines
1.2 KiB
ArmAsm
# This file defines the following function:
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# write_address_of_code(
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# const void* patch_code,
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# size_t patch_code_size,
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# void** ptr_addr);
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# This function allocates memory for patch_code, copies patch_code to that
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# memory, then writes the address of the allocated code at the specified
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# pointer. The allocated memory is never freed.
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# This function pops its arguments off the stack before returning.
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write_call_to_code:
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# [esp + 0x04] = code ptr
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# [esp + 0x08] = code size
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# [esp + 0x0C] = ptr addr
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# Allocate memory for the copied code
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mov ecx, [0x00AAB404]
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push dword [esp + 0x08]
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mov eax, 0x007A8A38
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call eax # malloc7
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test eax, eax
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je done
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# Copy the code to the newly-allocated memory
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# eax = dest pointer (from malloc7 call above)
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mov edx, [esp + 0x04] # edx = source pointer
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mov ecx, [esp + 0x08] # ecx = source size
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push ebx
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memcpy_again:
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dec ecx
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mov bl, [edx + ecx] # Copy one byte from source to dest
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mov [eax + ecx], bl
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test ecx, ecx
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jne memcpy_again
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pop ebx
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# Write the address
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mov ecx, [esp + 0x0C]
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mov [ecx], eax
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done:
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ret 0x0C
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