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#pragma once
#define GEN_SYSCALL(name, num) \
__asm__(".private_extern _manual_" #name "\n" \
".pushsection __TEXT,__text,regular,pure_instructions\n" \
GEN_SYSCALL_PRE(name) \
"_manual_" #name ":\n" \
".set num, " #num "\n" \
GEN_SYSCALL_INNER() \
".popsection\n")
#define GEN_SYSCALL_PRE(name)
#if defined(__x86_64__)
/* Look at me, I'm different! */
#define GEN_SYSCALL_INNER() \
".if num < 0\n" \
"mov $(-num | 1 << 24), %eax\n" \
".else\n" \
"mov $( num | 2 << 24), %eax\n" \
".endif\n" \
"mov %rcx, %r10\n" \
"syscall\n" \
"ret\n"
#elif defined(__i386__)
#define GEN_SYSCALL_INNER() \
"mov $num, %eax\n" \
"call 0f\n" \
"0: pop %edx\n" \
"add $(1f-0b), %edx\n" \
"mov %esp, %ecx\n" \
"sysenter\n" \
"1: ret\n"
#elif defined(__arm__)
#ifdef __thumb__
#undef GEN_SYSCALL_PRE
#define GEN_SYSCALL_PRE(name) \
".thumb_func _manual_" #name "\n" \
".align 2\n"
#endif
#define GEN_SYSCALL_INNER() \
"mov r12, sp\n" \
"push {r4-r6}\n" \
"ldm r12, {r4-r6}\n" \
"mov r12, #num\n" \
"svc #0x80\n" \
"pop {r4-r6}\n" \
"bx lr\n"
#elif defined(__arm64__)
#define GEN_SYSCALL_INNER() \
"mov x16, #num\n" \
"svc #0x80\n" \
"ret\n"
#else
#error ?
#endif
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