SWAMPy

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EDITING: hooking.c

#include "../../osapi.h"
#include "../../supertramp.h"
#include "../../debug.h"

/////////////////////////////////////////////////////////////////////
// Hooking techniques
//  Function pointers
//  Function descriptors (POWER only)
/////////////////////////////////////////////////////////////////////

int hook_function_pointer(trampoline_t* tramp) {
	// Intercept address is a function pointer
	tramp->original_funcptr = *(void**)tramp->intercept_addr;
	if (force_atomic_exchange(tramp->intercept_addr, 
							(unsigned long)tramp->trampoline_vaddr, 
							(unsigned long)tramp->original_funcptr) != 0) {
		err_msg("Hook funcptr failure at %p\n", tramp->intercept_addr);
		tramp->original_funcptr = NULL;
		return ERR_HOOK_FAILURE;
	} else {
		dbg_msg("Hook funcptr at %p: (%p) to (%p)\n",
				tramp->intercept_addr, tramp->original_funcptr, tramp->trampoline_vaddr);
		return SUPERTRAMP_OK;
	}

}

int unhook_function_pointer(trampoline_t* tramp) {
	if (force_atomic_exchange(tramp->intercept_addr,
							(unsigned long)tramp->original_funcptr, 
							(unsigned long)tramp->trampoline_vaddr) != 0) {
		info_msg("Unhook trampoline[%d] @ %p failed. Expected=%lx Actual=%lx\n",
				tramp->id, tramp->intercept_addr,
				(unsigned long)tramp->trampoline_vaddr,
				*(unsigned long*)tramp->intercept_addr);
		return ERR_UNHOOK_FAILURE;
	}

return SUPERTRAMP_OK;
}

int hook_function_descriptor(trampoline_t* tramp) {
	return ERR_HOOK_FAILURE;
}

int unhook_function_descriptor(trampoline_t* tramp) {
	return ERR_HOOK_FAILURE;
}

CANCEL

Name	Type	Size	Modified	Actions
↩ ..	DIR	—	—
📄 asm_utils.h	H	849 B	2023-06-26 03:19	EDIT
📄 hooking.c	C	1.5 KB	2023-06-26 03:19	EDIT