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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
95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/* ------------------------------------------------------------- */
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/* support for run_nostdlib() */
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// FIXME: implement arm64 assembler
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#if defined(__aarch64__)
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#define USE_ARM64_ASM
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static void *alloca_arm64(unsigned long);
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__asm__(
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#ifdef __leading_underscore
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"_alloca_arm64:\n\t"
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#else
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"alloca_arm64:\n\t"
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#endif
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".int 0x91003c00\n\t" // add x0, x0, #15
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".int 0x927cec00\n\t" // and x0, x0, #-16
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".int 0xcb2063ff\n\t" // sub sp, sp, x0
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".int 0x910003e0\n\t" // mov x0, sp
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".int 0xd65f03c0" // ret
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);
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static void goto_arm64(void *start);
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__asm__(
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#ifdef __leading_underscore
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"_goto_arm64:\n\t"
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#else
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"goto_arm64:\n\t"
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#endif
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".int 0xd61f0000" // br x0
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);
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#endif
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void _run_nostdlib(void *start, int argc, char **argv, char **envp)
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{
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#if !defined(_WIN32)
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int i, n = 1;
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unsigned long l;
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char **sp, **e = envp;
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if (envp)
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while (*e++)
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n++;
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l = (((unsigned long) argc + n + 2 + 1) & -2) * sizeof(char *);
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/* nostdlib so avoid alloca() */
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/* also code below will be removed because compiler detects dead store */
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#if defined(USE_ARM64_ASM)
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sp = alloca_arm64(l);
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#else
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#if defined(__aarch64__)
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__asm__("sub sp, sp, %1\n"
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"\tmov %0, sp"
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#elif defined(__arm__)
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__asm__("sub sp, sp, %1\n"
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"\tmov %0, sp"
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#elif defined(__i386__)
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__asm("sub %1, %%esp\n"
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"\tmov %%esp, %0"
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#elif defined(__riscv)
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__asm__("sub sp, sp, %1\n"
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"\tmv %0, sp"
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#elif defined(__x86_64__)
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__asm__("subq %1, %%rsp\n"
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"\tmovq %%rsp, %0"
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#endif
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: "=r" (sp)
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: "r" (l));
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#endif
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/* create sysv memory layout: argc, argv[], NULL, envp[], NULL */
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sp[0] = (char *) (__SIZE_TYPE__) argc;
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for (i = 0; i < argc; i++)
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sp[i + 1] = argv[i];
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sp[argc + 1] = (char *) 0;
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if (envp)
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for (i = 0; i < n; i++)
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sp[i + argc + 2] = envp[i];
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else
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sp[argc + 2] = (char *) 0;
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#endif
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/* goto *start does not work for clang. Use assembly. */
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#if defined(USE_ARM64_ASM)
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goto_arm64(start);
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#else
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#if defined(__aarch64__)
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__asm__("br %0" : : "r" (start));
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#elif defined(__arm__)
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__asm__("mov pc, %0" : : "r" (start));
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#elif defined(__i386__)
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__asm__("jmp *%0" : : "r" (start));
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#elif defined(__riscv)
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__asm__("jalr %0" : : "r" (start));
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#elif defined(__x86_64__)
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__asm__("jmp *%0" : : "r" (start));
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#endif
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#endif
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}
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