#pragma once

// Syscall numbers and definition macros — all derived from
// kernel/sys/table.inc, which is the single source of truth.
//
// Do NOT add SYS_* constants by hand, and do NOT add anything to
// kernel/sys/linux_abi.c: add one SYSCALL() line to table.inc and write the
// body with SYSCALL_DEFINE(). The constant, the dispatch slot and the Linux
// ABI mapping are all generated from that one line.

#define NSYSCALLS 512

// Scratch slot for syscalls with no Linux equivalent. Every such entry lands
// on this one index of the translation map, which is never dispatched (Linux
// x86_64 numbers currently top out around 450). Using a real index rather
// than a negative sentinel keeps the generated map a plain designated
// initialiser instead of needing a second macro.
#define NO_LINUX 511

#ifdef __ASSEMBLER__
// In .S files GCC passes through the C preprocessor but the assembler
// sees the output, so emit .set directives instead of an enum.
#define SYSCALL(nr, lnr, name) .set SYS_##name, nr
#define SYSCALL_ALIAS(lnr, name)
#include "../kernel/sys/table.inc"
#undef SYSCALL
#undef SYSCALL_ALIAS
#else
// In C files generate a proper enum so constants work in switch/designators.
enum syscall_nr {
    _SYS_RESERVED = 0,
#define SYSCALL(nr, lnr, name) SYS_##name = (nr),
#define SYSCALL_ALIAS(lnr, name)
#include "../kernel/sys/table.inc"
#undef SYSCALL
#undef SYSCALL_ALIAS
};

// Every syscall body is written as:
//
//     SYSCALL_DEFINE(getpid)
//     {
//         return myproc()->pid;
//     }
//
// so the signature lives in exactly one place and every implementation is
// findable with a single grep.
#define SYSCALL_DEFINE(name) addr_t sys_##name(void)
#endif