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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* System Call MI Layer — Jump Table & Dispatcher
*
* O(1) function pointer array dispatch. No switch-case.
* syscall_init() registers all implemented handlers.
*
* Reference: docs/specs/syscall.md §6
*/
#include <lume/syscall.h>
#include <lume/syscall_nr.h>
#include <lume/errno.h>
#include <lume/kprintf.h>
#include <lume/klog.h>
#include <lume/console.h>
#include <arch/cpu.h>
/* ======================================================================
* Jump table
* ====================================================================== */
inline constexpr int kNrSyscalls = 512;
static SyscallHandler sys_call_table[kNrSyscalls];
/* ======================================================================
* MI Dispatcher
* ====================================================================== */
int64 syscall_dispatch(uint64 nr, uint64 args[6])
{
if (nr >= static_cast<uint64>(kNrSyscalls)) {
kprintf("[syscall] nr=%llu out of range\n", nr);
return -ENOSYS;
}
/* Per-syscall entry trace. KLOG_DEBUG keeps it out of the console
* by default; enable via klog_set_level(KLOG_DEBUG) or read the
* ring buffer to investigate. Subsys mask gates this further. */
pr_debug_s(KLOG_SUBSYS_SYSCALL,
"syscall: nr=%llu a0=%llx a1=%llx a2=%llx a3=%llx\n",
nr, args[0], args[1], args[2], args[3]);
SyscallHandler handler = sys_call_table[nr];
if (!handler) {
kprintf("[syscall] unimplemented nr=%llu\n", nr);
return -ENOSYS;
}
return handler(args[0], args[1], args[2],
args[3], args[4], args[5]);
}
/* ======================================================================
* Forward declarations of sys_* handlers
* ====================================================================== */
/* sys_process.cc */
int64 sys_exit(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_exit_group(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_getpid(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_gettid(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_getppid(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_sched_yield_wrapper(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_clone_wrapper(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_wait4_wrapper(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_set_tid_address(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_getuid(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_getgid(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_nanosleep(uint64, uint64, uint64, uint64, uint64, uint64);
/* sys_mm.cc */
int64 sys_brk(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_mmap(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_munmap(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_mprotect(uint64, uint64, uint64, uint64, uint64, uint64);
/* sys_info.cc */
int64 sys_uname(uint64, uint64, uint64, uint64, uint64, uint64);
/* sys_fs.cc */
int64 sys_openat(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_close(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_read(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_write(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_lseek(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_fstat_wrapper(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_getdents64(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_dup(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_dup3(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_getcwd(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_chdir(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_mkdirat(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_unlinkat(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_writev(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_ioctl(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_ppoll(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_pipe2(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_fcntl(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_socket(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_sendto(uint64, uint64, uint64, uint64, uint64, uint64);
/* sys_signal.cc */
int64 sys_kill(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_tkill(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_tgkill(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_rt_sigaction(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_rt_sigprocmask(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_rt_sigreturn(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_rt_sigtimedwait(uint64, uint64, uint64, uint64, uint64, uint64);
/* exec.cc */
int64 sys_execve_wrapper(uint64, uint64, uint64, uint64, uint64, uint64);
/* sys_misc.cc */
int64 sys_reboot(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_prctl(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_setsid(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_getsid(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_setpgid(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_getpgid(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_geteuid(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_getegid(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_sigaltstack(uint64, uint64, uint64, uint64, uint64, uint64);
int64 sys_clock_gettime(uint64, uint64, uint64, uint64, uint64, uint64);
/* ======================================================================
* syscall_init — register all handlers
* ====================================================================== */
void syscall_init()
{
/* Zero the table (redundant for BSS, but explicit) */
for (int i = 0; i < kNrSyscalls; i++)
sys_call_table[i] = nullptr;
/* Phase 2: minimal runnable set */
sys_call_table[SYS_exit] = sys_exit;
sys_call_table[SYS_exit_group] = sys_exit_group;
sys_call_table[SYS_getpid] = sys_getpid;
sys_call_table[SYS_gettid] = sys_gettid;
sys_call_table[SYS_getppid] = sys_getppid;
sys_call_table[SYS_sched_yield] = sys_sched_yield_wrapper;
sys_call_table[SYS_clone] = sys_clone_wrapper;
sys_call_table[SYS_wait4] = sys_wait4_wrapper;
sys_call_table[SYS_set_tid_address] = sys_set_tid_address;
sys_call_table[SYS_getuid] = sys_getuid;
sys_call_table[SYS_getgid] = sys_getgid;
sys_call_table[SYS_brk] = sys_brk;
sys_call_table[SYS_mmap] = sys_mmap;
sys_call_table[SYS_munmap] = sys_munmap;
sys_call_table[SYS_mprotect] = sys_mprotect;
sys_call_table[SYS_uname] = sys_uname;
/* Phase 3: filesystem */
sys_call_table[SYS_openat] = sys_openat;
sys_call_table[SYS_close] = sys_close;
sys_call_table[SYS_read] = sys_read;
sys_call_table[SYS_write] = sys_write;
sys_call_table[SYS_lseek] = sys_lseek;
sys_call_table[SYS_fstat] = sys_fstat_wrapper;
sys_call_table[SYS_getdents64] = sys_getdents64;
sys_call_table[SYS_dup] = sys_dup;
sys_call_table[SYS_dup3] = sys_dup3;
sys_call_table[SYS_getcwd] = sys_getcwd;
sys_call_table[SYS_chdir] = sys_chdir;
sys_call_table[SYS_mkdirat] = sys_mkdirat;
sys_call_table[SYS_unlinkat] = sys_unlinkat;
sys_call_table[SYS_writev] = sys_writev;
sys_call_table[SYS_ioctl] = sys_ioctl;
sys_call_table[SYS_ppoll] = sys_ppoll;
/* Phase 4: signals */
sys_call_table[SYS_kill] = sys_kill;
sys_call_table[SYS_tkill] = sys_tkill;
sys_call_table[SYS_tgkill] = sys_tgkill;
sys_call_table[SYS_rt_sigaction] = sys_rt_sigaction;
sys_call_table[SYS_rt_sigprocmask] = sys_rt_sigprocmask;
sys_call_table[SYS_rt_sigreturn] = sys_rt_sigreturn;
sys_call_table[SYS_rt_sigtimedwait] = sys_rt_sigtimedwait;
/* Phase 5: exec */
sys_call_table[SYS_execve] = sys_execve_wrapper;
/* Phase 6: pipe + fcntl */
sys_call_table[SYS_pipe2] = sys_pipe2;
sys_call_table[SYS_fcntl] = sys_fcntl;
/* Phase 7: busybox bootstrap */
sys_call_table[SYS_reboot] = sys_reboot;
sys_call_table[SYS_prctl] = sys_prctl;
sys_call_table[SYS_setsid] = sys_setsid;
sys_call_table[SYS_getsid] = sys_getsid;
sys_call_table[SYS_setpgid] = sys_setpgid;
sys_call_table[SYS_getpgid] = sys_getpgid;
sys_call_table[SYS_geteuid] = sys_geteuid;
sys_call_table[SYS_getegid] = sys_getegid;
sys_call_table[SYS_sigaltstack] = sys_sigaltstack;
sys_call_table[SYS_clock_gettime] = sys_clock_gettime;
sys_call_table[SYS_nanosleep] = sys_nanosleep;
sys_call_table[SYS_socket] = sys_socket;
sys_call_table[SYS_sendto] = sys_sendto;
printk(KERN_INFO "init: syscall_init done (%d handlers registered)\n", 46);
}
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