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69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/mman.h>
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#define DEFINE_ASM(_name, _code) \
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extern const char _name[]; \
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extern const char _name ## _end[]; \
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asm(" .globl " #_name "\n" \
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#_name ":\n" \
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" " _code "\n" \
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" .globl " #_name "_end\n" \
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#_name "_end:\n");
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DEFINE_ASM(br_r14, "br %r14");
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DEFINE_ASM(brasl_r0, "brasl %r0,-0x100000000");
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DEFINE_ASM(brcl_0xf, "brcl 0xf,-0x100000000");
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struct test {
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const char *code;
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const char *code_end;
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};
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static const struct test tests[] = {
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{
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.code = brasl_r0,
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.code_end = brasl_r0_end,
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},
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{
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.code = brcl_0xf,
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.code_end = brcl_0xf_end,
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},
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};
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int main(void)
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{
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unsigned char *buf;
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size_t length = 0;
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size_t i;
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for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
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size_t test_length = 0x100000000 + (tests[i].code_end - tests[i].code);
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if (test_length > length) {
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length = test_length;
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}
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}
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buf = mmap(NULL, length, PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
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if (buf == MAP_FAILED) {
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perror("SKIP: mmap() failed");
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return 0;
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}
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memcpy(buf, br_r14, br_r14_end - br_r14);
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for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
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void (*code)(void) = (void *)(buf + 0x100000000);
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memcpy(code, tests[i].code, tests[i].code_end - tests[i].code);
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code();
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memset(code, 0, tests[i].code_end - tests[i].code);
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}
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munmap(buf, length);
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return 0;
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}
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