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https://github.com/TinyCC/tinycc.git
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8569427459
tcc.h, arm-gen.c, arm64-gen.c, i386-gen.c, riscv64-gen.c, x86_64-gen.c: - remove old code tccrun.c: - update to use lib/run_nostdlib.c Makefile, lib/Makefile, lib/run_nostdlib.c: - new code tests/nostdlib_test.c: - testcode
156 lines
3.3 KiB
C
Executable File
156 lines
3.3 KiB
C
Executable File
#!/usr/local/bin/tcc -run -nostdlib
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// Not working on windows and apple because of different API.
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#include <unistd.h>
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#include <sys/syscall.h>
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#if defined __x86_64__
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__asm__ ("syscall:\n\t"
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"mov %rdi,%rax\n\t"
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"mov %rsi,%rdi\n\t"
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"mov %rdx,%rsi\n\t"
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"mov %rcx,%rdx\n\t"
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"mov %r8,%r10\n\t"
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"mov %r9,%r8\n\t"
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"mov 0x8(%rsp),%r9\n\t"
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"syscall\n\t"
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"ret");
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__asm__ (".global _start\n\t"
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"_start:\n\t"
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"mov 0(%rsp), %rdi\n\t"
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"lea 8(%rsp), %rsi\n\t"
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"jmp print");
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#elif defined __i386__
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__asm__ ("syscall:\n\t"
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"push %ebp\n\t"
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"push %edi\n\t"
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"push %esi\n\t"
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"push %ebx\n\t"
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"mov 0x2c(%esp),%ebp\n\t"
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"mov 0x28(%esp),%edi\n\t"
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"mov 0x24(%esp),%esi\n\t"
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"mov 0x20(%esp),%edx\n\t"
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"mov 0x1c(%esp),%ecx\n\t"
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"mov 0x18(%esp),%ebx\n\t"
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"mov 0x14(%esp),%eax\n\t"
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// "call *%gs:0x10\n\t"
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".byte 0x65,0xff,0x15,0x10,0x00,0x00,0x00\n\t"
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"pop %ebx\n\t"
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"pop %esi\n\t"
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"pop %edi\n\t"
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"pop %ebp\n\t"
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"ret");
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__asm__ (".global _start\n\t"
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"_start:\n\t"
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"pop %esi\n\t"
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"mov %esp, %ecx\n\t"
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"and $0xfffffff0,%esp\n\t"
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"push %ecx\n\t"
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"push %esi\n\t"
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"call print");
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#elif defined __arm__
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__asm__ ("syscall:\n\t"
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"mov r12, sp\n\t"
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"push {r4, r5, r6, r7}\n\t"
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"mov r7, r0\n\t"
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"mov r0, r1\n\t"
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"mov r1, r2\n\t"
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"mov r2, r3\n\t"
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"ldm r12, {r3, r4, r5, r6}\n\t"
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"svc 0x00000000\n\t"
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"pop {r4, r5, r6, r7}\n\t"
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"mov pc, lr");
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__asm__ (".global _start\n\t"
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"_start:\n\t"
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"pop {r0}\n\t"
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"mov r1, sp\n\t"
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"bl print");
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#elif defined __aarch64__
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__asm__ ("syscall:\n\t"
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".int 0x2a0003e8\n\t" // mov w8, w0
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".int 0xaa0103e0\n\t" // x0, x1
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".int 0xaa0203e1\n\t" // mov x1, x2
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".int 0xaa0303e2\n\t" // mov x2, x3
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".int 0xaa0403e3\n\t" // mov x3, x4
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".int 0xaa0503e4\n\t" // mov x4, x5
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".int 0xaa0603e5\n\t" // mov x5, x6
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".int 0xaa0703e6\n\t" // mov x6, x7
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".int 0xd4000001\n\t" // svc #0x0
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".int 0xd65f03c0"); // ret
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__asm__ (".global _start\n\t"
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"_start:\n\t"
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".int 0xf94003e0\n\t" // ldr x0, [sp]
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".int 0x910023e1\n\t" // add x1, sp, #08
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".reloc .,R_AARCH64_CALL26,print\n\t"
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".int 0x94000000"); // bl print
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#elif defined __riscv
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__asm__ ("syscall:\n\t"
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"mv t1,a0\n\t"
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"mv a0,a1\n\t"
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"mv a1,a2\n\t"
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"mv a2,a3\n\t"
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"mv a3,a4\n\t"
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"mv a4,a5\n\t"
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"mv a5,a6\n\t"
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"mv a6,a7\n\t"
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"mv a7,t1\n\t"
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"ecall\n\t"
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"ret");
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__asm__ (".global _start\n\t"
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"_start:\n\t"
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"ld a0,0(sp)\n\t"
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"addi a1,sp,8\n\t"
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"jal print");
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#endif
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unsigned long strlen(const char *s)
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{
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unsigned long len = 0;
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while (*s++)
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len++;
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return len;
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}
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static void pr_num(int num)
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{
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char val[20], *p = &val[20];
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*--p = '\0';
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do {
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int a = num, b = 0;
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while (a >= 10) {
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a -= 10;
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b++;
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}
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*--p = a + '0';
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num = b;
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} while (num);
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syscall(SYS_write, 1, p, strlen(p));
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}
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static void pr_str(int n, char *s)
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{
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pr_num(n);
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syscall(SYS_write, 1, ": ", 2);
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syscall(SYS_write, 1, s, strlen(s));
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syscall(SYS_write, 1, "\n", 1);
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}
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void print(int argc, char **argv) {
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int i;
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char **envp = &argv[argc + 1];
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syscall(SYS_write, 1, "argc: ", 6);
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pr_num(argc);
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syscall(SYS_write, 1, "\n", 1);
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syscall(SYS_write, 1, "argv[]\n", 7);
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for (i = 0; i < argc; i++)
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pr_str(i, argv[i]);
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syscall(SYS_write, 1, "envp[]\n", 7);
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i = 0;
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while (*envp)
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pr_str(i++, *envp++);
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syscall(SYS_exit, 0);
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}
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