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x86-testapp.c 1.84 KiB
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  • #include <stddef.h>
    #include <stdio.h>
    #include <string.h>
    
    void *func[8], **pfunc;
    
    typedef struct xxx xxx_t;
    struct xxx {
    	int dummy;
    	void **pfunc;
    } q;
    
    #define XF_strcpy 3
    #define XF_printf 4
    
    #define LABEL(x)					\
    asm volatile (						\
    
    #if defined(__i386__)
    #define EXPORT_FUNC(x)					\
    asm volatile (						\
    "	.globl mon_" #x "\n"				\
    "mon_" #x ":\n"						\
    "	movl	%0, %%eax\n"				\
    "	movl	pfunc, %%ecx\n"				\
    "	jmp	*(%%ecx,%%eax)\n"			\
    	: : "i"(XF_ ## x * sizeof(void *)) : "eax", "ecx");
    #elif defined(__powerpc__)
    #define EXPORT_FUNC(x)					\
    asm volatile (						\
    "	.globl mon_" #x "\n"				\
    "mon_" #x ":\n"						\
    "	lwz	%%r11, %0(%%r29)\n"			\
    "	lwz	%%r11, %1(%%r11)\n"			\
    "	mtctr	%%r11\n"				\
    "	bctr\n"					\
    	: : "i"(offsetof(xxx_t, pfunc)), "i"(XF_ ## x * sizeof(void *)) : "r11", "r29");
    #elif defined(__arm__)
    #define EXPORT_FUNC(x)					\
    asm volatile (						\
    "	.globl mon_" #x "\n"				\
    "mon_" #x ":\n"						\
    "	ldr	ip, [r8, %0]\n"				\
    "	ldr	pc, [ip, %1]\n"				\
    	: : "i"(offsetof(xxx_t, pfunc)), "i"(XF_ ## x * sizeof(void *)) : "ip");
    #elif defined(__mips__)
    #define EXPORT_FUNC(x)					\
    asm volatile (						\
    "	.globl mon_" #x "\n"				\
    "mon_" #x ":\n"						\
    "	lw	$25, %0($26)\n"				\
    "	lw	$25, %1($25)\n"				\
    "	jr	$25\n"					\
    	: : "i"(offsetof(xxx_t, pfunc)), "i"(XF_ ## x * sizeof(void *)) : "t9");
    #else
    #error [No stub code for this arch]
    #endif
    
    void dummy(void)
    {
    EXPORT_FUNC(printf)
    EXPORT_FUNC(strcpy)
    }
    
    int main(void)
    {
    #if defined(__i386__)
    	xxx_t *pq;
    #elif defined(__powerpc__)
    	register volatile xxx_t *pq asm("r29");
    #elif defined(__arm__)
    	register volatile xxx_t *pq asm("r8");
    #elif defined(__mips__)
    	register volatile xxx_t *pq asm("k0");
    #endif
    	char buf[32];
    
    	func[XF_strcpy] = strcpy;
    	func[XF_printf] = printf;
    	pq = &q;
    	pq->pfunc = pfunc = func;
    
    	mon_strcpy(buf, "test");
    	mon_printf("hi %s %d z\n", buf, 444);
    
    	return 0;
    }