1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/* 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>
/* ======================================================================
* 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))
return -ENOSYS;
SyscallHandler handler = sys_call_table[nr];
if (!handler)
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);
/* 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);
/* ======================================================================
* 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;
printk(KERN_INFO "init: syscall_init done (16 handlers registered)\n");
}
|
