80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
#if defined(__linux__)
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#if defined(__x86_64__)
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#define SYS_WRITE 1
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#define SYS_EXIT 60
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#define SYSCALL_INST "syscall"
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#elif defined(__aarch64__)
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#define SYS_WRITE 64
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#define SYS_EXIT 93
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#define SYSCALL_INST "svc #0"
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#elif defined(__riscv) && __riscv_xlen == 64
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#define SYS_WRITE 64
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#define SYS_EXIT 93
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#define SYSCALL_INST "ecall"
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#endif
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#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
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#define SYS_WRITE 4
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#define SYS_EXIT 1
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#define SYSCALL_INST "syscall"
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#elif defined(__APPLE__)
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#define SYS_WRITE 0x2000004
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#define SYS_EXIT 0x2000001
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#if defined(__x86_64__)
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#define SYSCALL_INST "syscall"
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#elif defined(__aarch64__)
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#define SYSCALL_INST "svc #0"
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#endif
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#endif
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char msg[] = "こんにちは、世界！\n";
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__attribute((naked))
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void _start() {
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asm volatile(
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#if defined(__x86_64__)
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".intel_syntax noprefix\n"
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"mov eax, %[sys_write]\n"
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"mov edi, 1\n"
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"mov rsi, offset msg\n"
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"mov edx, %[len]\n"
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SYSCALL_INST "\n"
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"mov eax, %[sys_exit]\n"
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"xor edi, edi\n"
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SYSCALL_INST "\n"
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#elif defined(__aarch64__)
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"mov x8, %[sys_write]\n"
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"mov x0, #1\n"
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"mov x1, %[msg]\n"
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"mov x2, %[len]\n"
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SYSCALL_INST "\n"
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"mov x8, %[sys_exit]\n"
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"mov x0, #0\n"
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SYSCALL_INST "\n"
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#elif defined(__riscv) && __riscv_xlen == 64
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"li a7, %[sys_write]\n"
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"li a0, 1\n"
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"mv a1, %[msg]\n"
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"li a2, %[len]\n"
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SYSCALL_INST "\n"
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"li a7, %[sys_exit]\n"
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"li a0, 0\n"
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SYSCALL_INST "\n"
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#endif
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:: [sys_write] "i" (SYS_WRITE),
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[sys_exit] "i" (SYS_EXIT),
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[len] "i" (sizeof(msg) - 1),
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[msg] "r" (msg)
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: "memory",
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#if defined(__x86_64__)
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"rax", "rdi", "rsi", "rdx" // x86-64
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#elif defined(__aarch64__)
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"x0", "x1", "x2", "x8" // AArch64
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#elif defined(__riscv) && __riscv_xlen == 64
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"a0", "a1", "a2", "a7" // RISC-V
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#endif
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);
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}
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