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https://github.com/smaeul/u-boot.git
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e7670f6c1e
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>
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#include <stdio.h>
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#include <string.h>
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void *func[8], **pfunc;
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typedef struct xxx xxx_t;
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struct xxx {
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int dummy;
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void **pfunc;
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} q;
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#define XF_strcpy 3
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#define XF_printf 4
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#define LABEL(x) \
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asm volatile ( \
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#if defined(__i386__)
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#define EXPORT_FUNC(x) \
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asm volatile ( \
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" .globl mon_" #x "\n" \
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"mon_" #x ":\n" \
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" movl %0, %%eax\n" \
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" movl pfunc, %%ecx\n" \
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" jmp *(%%ecx,%%eax)\n" \
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: : "i"(XF_ ## x * sizeof(void *)) : "eax", "ecx");
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#elif defined(__powerpc__)
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#define EXPORT_FUNC(x) \
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asm volatile ( \
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" .globl mon_" #x "\n" \
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"mon_" #x ":\n" \
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" lwz %%r11, %0(%%r2)\n" \
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" lwz %%r11, %1(%%r11)\n" \
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" mtctr %%r11\n" \
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" bctr\n" \
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: : "i"(offsetof(xxx_t, pfunc)), "i"(XF_ ## x * sizeof(void *)) : "r11", "r2");
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#elif defined(__arm__)
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#define EXPORT_FUNC(x) \
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asm volatile ( \
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" .globl mon_" #x "\n" \
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"mon_" #x ":\n" \
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" ldr ip, [r8, %0]\n" \
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" ldr pc, [ip, %1]\n" \
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: : "i"(offsetof(xxx_t, pfunc)), "i"(XF_ ## x * sizeof(void *)) : "ip");
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#elif defined(__mips__)
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#define EXPORT_FUNC(x) \
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asm volatile ( \
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" .globl mon_" #x "\n" \
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"mon_" #x ":\n" \
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" lw $25, %0($26)\n" \
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" lw $25, %1($25)\n" \
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" jr $25\n" \
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: : "i"(offsetof(xxx_t, pfunc)), "i"(XF_ ## x * sizeof(void *)) : "t9");
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#else
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#error [No stub code for this arch]
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#endif
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void dummy(void)
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{
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EXPORT_FUNC(printf)
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EXPORT_FUNC(strcpy)
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}
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int main(void)
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{
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#if defined(__i386__)
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xxx_t *pq;
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#elif defined(__powerpc__)
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register volatile xxx_t *pq asm("r2");
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#elif defined(__arm__)
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register volatile xxx_t *pq asm("r8");
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#elif defined(__mips__)
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register volatile xxx_t *pq asm("k0");
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#endif
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char buf[32];
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func[XF_strcpy] = strcpy;
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func[XF_printf] = printf;
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pq = &q;
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pq->pfunc = pfunc = func;
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mon_strcpy(buf, "test");
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mon_printf("hi %s %d z\n", buf, 444);
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return 0;
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}
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