mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 00:48:52 +09:00
![Wolfgang Denk](/assets/img/avatar_default.png)
R29 was an unlucky choice as with recent toolchains (gcc-4.2.x) gcc will refuse to use load/store multiple insns; instead, it issues a list of simple load/store instructions upon function entry and exit, resulting in bigger code size, which in turn makes the build for a few boards fail. Use r2 instead. Signed-off-by: Wolfgang Denk <wd@denx.de>
88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
#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(%%r2)\n" \
|
|
" lwz %%r11, %1(%%r11)\n" \
|
|
" mtctr %%r11\n" \
|
|
" bctr\n" \
|
|
: : "i"(offsetof(xxx_t, pfunc)), "i"(XF_ ## x * sizeof(void *)) : "r11", "r2");
|
|
#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("r2");
|
|
#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;
|
|
}
|