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157 lines
4 KiB
C
157 lines
4 KiB
C
/* SPDX-License-Identifier: MIT */
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/* Copyright (c) 2021 Winlin */
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#include <stdio.h>
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#include <setjmp.h>
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int foo_return_zero();
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int foo_return_one();
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extern void print_buf(unsigned char* p, int nn_jb);
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extern void print_jmpbuf();
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int main(int argc, char** argv)
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{
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printf("OS specs:\n");
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#ifdef __linux__
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printf("__linux__: %d\n", __linux__);
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#endif
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#ifdef __APPLE__
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printf("__APPLE__: %d\n", __APPLE__);
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#endif
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printf("\nCPU specs:\n");
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#ifdef __mips__
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// https://s3-eu-west-1.amazonaws.com/downloads-mips/documents/MD00565-2B-MIPS32-QRC-01.01.pdf
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printf("__mips__: %d, __mips:%d, _MIPSEL:%d\n", __mips__, __mips, _MIPSEL);
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#endif
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#ifdef __x86_64__
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printf("__x86_64__: %d\n", __x86_64__);
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#endif
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printf("\nCompiler specs:\n");
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#ifdef __GLIBC__
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printf("__GLIBC__: %d\n", __GLIBC__);
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#endif
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printf("sizeof(long)=%d\n", (int)sizeof(long));
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printf("sizeof(long long int)=%d\n", (int)sizeof(long long int));
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printf("sizeof(void*)=%d\n", (int)sizeof(void*));
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#ifdef __ptr_t
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printf("sizeof(__ptr_t)=%d\n", sizeof(__ptr_t));
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#endif
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printf("\nReturn value:\n");
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int r0 = foo_return_zero();
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int r1 = foo_return_one();
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printf("foo_return_zero=%d, foo_return_one=%d\n", r0, r1);
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printf("\nCalling conventions:\n");
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print_jmpbuf();
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return 0;
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}
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int foo_return_zero()
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{
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return 0;
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}
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int foo_return_one()
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{
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return 1;
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}
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#ifdef __linux__
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#ifdef __mips__
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void print_jmpbuf()
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{
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// https://en.wikipedia.org/wiki/MIPS_architecture#Calling_conventions
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register void* ra asm("ra");
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register void* gp asm("gp");
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register void* sp asm("sp");
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register void* fp asm("fp");
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// $s0–$s7 $16–$23 saved temporaries
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register void* s0 asm("s0");
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register void* s1 asm("s1");
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register void* s2 asm("s2");
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register void* s3 asm("s3");
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register void* s4 asm("s4");
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register void* s5 asm("s5");
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register void* s6 asm("s6");
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register void* s7 asm("s7");
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/*
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typedef unsigned long long __jmp_buf[13];
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typedef struct __jmp_buf_tag {
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__jmp_buf __jb;
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unsigned long __fl;
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unsigned long __ss[128/sizeof(long)];
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} jmp_buf[1];
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*/
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jmp_buf ctx = {0};
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int r0 = setjmp(ctx);
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if (!r0) {
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longjmp(ctx, 1);
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}
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printf("ra=%p, sp=%p, s0=%p, s1=%p, s2=%p, s3=%p, s4=%p, s5=%p, s6=%p, s7=%p, fp=%p, gp=%p\n",
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ra, sp, s0, s1, s2, s3, s4, s5, s6, s7, fp, gp);
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int nn_jb = sizeof(ctx[0].__jb);
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printf("sizeof(jmp_buf)=%d (unsigned long long [%d])\n", nn_jb, nn_jb/8);
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unsigned char* p = (unsigned char*)ctx[0].__jb;
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print_buf(p, nn_jb);
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}
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#endif
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#endif
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#ifdef __APPLE__
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#ifdef __x86_64__
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void print_jmpbuf()
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{
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// https://courses.cs.washington.edu/courses/cse378/10au/sections/Section1_recap.pdf
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void *rbx, *rbp, *r12, *r13, *r14, *r15, *rsp;
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__asm__ __volatile__ ("movq %%rbx,%0": "=r"(rbx): /* No input */);
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__asm__ __volatile__ ("movq %%rbp,%0": "=r"(rbp): /* No input */);
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__asm__ __volatile__ ("movq %%r12,%0": "=r"(r12): /* No input */);
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__asm__ __volatile__ ("movq %%r13,%0": "=r"(r13): /* No input */);
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__asm__ __volatile__ ("movq %%r14,%0": "=r"(r14): /* No input */);
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__asm__ __volatile__ ("movq %%r15,%0": "=r"(r15): /* No input */);
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__asm__ __volatile__ ("movq %%rsp,%0": "=r"(rsp): /* No input */);
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printf("rbx=%p, rbp=%p, r12=%p, r13=%p, r14=%p, r15=%p, rsp=%p\n",
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rbx, rbp, r12, r13, r14, r15, rsp);
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jmp_buf ctx = {0};
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int r0 = setjmp(ctx);
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if (!r0) {
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longjmp(ctx, 1);
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}
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int nn_jb = sizeof(ctx);
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printf("sizeof(jmp_buf)=%d (unsigned long long [%d])\n", nn_jb, nn_jb/8);
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unsigned char* p = (unsigned char*)ctx;
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print_buf(p, nn_jb);
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}
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#endif
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#endif
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void print_buf(unsigned char* p, int nn_jb)
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{
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printf(" ");
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for (int i = 0; i < nn_jb; i++) {
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printf("0x%02x ", (unsigned char)p[i]);
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int newline = ((i + 1) % sizeof(void*));
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if (!newline || i == nn_jb - 1) {
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printf("\n");
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}
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if (!newline && i < nn_jb - 1) {
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printf(" ");
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}
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}
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}
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