Mark
145 lines
4.8 KiB
C
145 lines
4.8 KiB
C
#include <config.h>
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#include "user/syscall.h"
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#include "user/errno.h"
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#include "user/time.h"
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#include "sys/sched.h"
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#include "arch/amd64/cpu.h"
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#include "sys/thread.h"
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#include "sys/debug.h"
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#include "sys/mem/shmem.h"
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#include "sys/sys_file.h"
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#include "sys/sys_sys.h"
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#include "sys/sys_proc.h"
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#if defined(ENABLE_NET)
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#include "sys/sys_net.h"
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#endif
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#include "sys/mod.h"
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#define MSR_IA32_STAR 0xC0000081
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#define MSR_IA32_LSTAR 0xC0000082
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#define MSR_IA32_SFMASK 0xC0000084
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extern void syscall_entry(void);
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static void sys_debug_trace(const char *msg, size_t lim) {
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struct thread *thr = thread_self;
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_assert(thr);
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struct process *proc = thr->proc;
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_assert(proc);
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for (size_t i = 0; i < lim && msg[i]; ++i) {
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debugc(DEBUG_DEFAULT, msg[i]);
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}
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}
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void *syscall_table[256] = {
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// I/O
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[SYSCALL_NR_READ] = sys_read,
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[SYSCALL_NR_WRITE] = sys_write,
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[SYSCALL_NR_OPENAT] = sys_openat,
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[SYSCALL_NR_CLOSE] = sys_close,
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[SYSCALL_NR_FSTATAT] = sys_fstatat,
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[SYSCALL_NR_LSEEK] = sys_lseek,
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[SYSCALL_NR_MMAP] = sys_mmap,
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[SYSCALL_NR_MUNMAP] = sys_munmap,
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[SYSCALL_NR_IOCTL] = sys_ioctl,
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[SYSCALL_NR_FACCESSAT] = sys_faccessat,
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[SYSCALL_NR_PIPE] = sys_pipe,
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[SYSCALL_NR_SELECT] = sys_select,
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[SYSCALL_NR_DUP] = sys_dup,
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[SYSCALL_NR_DUP2] = sys_dup2,
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[SYSCALL_NR_TRUNCATE] = sys_truncate,
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[SYSCALL_NR_FTRUNCATE] = sys_ftruncate,
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[SYSCALL_NR_GETCWD] = sys_getcwd,
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[SYSCALL_NR_CHDIR] = sys_chdir,
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[SYSCALL_NR_MKDIRAT] = sys_mkdirat,
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[SYSCALL_NR_CREAT] = sys_creat,
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[SYSCALL_NR_UNLINKAT] = sys_unlinkat,
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[SYSCALL_NR_READDIR] = sys_readdir,
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[SYSCALL_NR_CHMOD] = sys_chmod,
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[SYSCALL_NR_READLINKAT] = sys_readlinkat,
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[SYSCALL_NR_CHOWN] = sys_chown,
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[SYSCALL_NR_MKNOD] = sys_mknod,
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// User control
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[SYSCALL_NR_GETUID] = sys_getuid,
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[SYSCALL_NR_GETGID] = sys_getgid,
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[SYSCALL_NR_SETUID] = sys_setuid,
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[SYSCALL_NR_SETGID] = sys_setgid,
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// Process control
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[SYSCALL_NRX_SIGENTRY] = sys_sigentry,
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[SYSCALL_NR_EXECVE] = sys_execve,
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[SYSCALL_NR_YIELD] = sys_yield,
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[SYSCALL_NR_GETPID] = sys_getpid,
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[SYSCALL_NR_CLONE] = sys_clone,
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[SYSCALL_NR_KILL] = sys_kill,
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[SYSCALL_NR_EXIT] = sys_exit,
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[SYSCALL_NR_SIGRETURN] = sys_sigreturn,
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[SYSCALL_NRX_WAITPID] = sys_waitpid,
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[SYSCALL_NR_GETPGID] = sys_getpgid,
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[SYSCALL_NR_SETPGID] = sys_setpgid,
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[SYSCALL_NR_SETSID] = sys_setsid,
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[SYSCALL_NR_SIGALTSTACK] = sys_sigaltstack,
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[SYSCALL_NR_GETPPID] = sys_getppid,
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// Shared memory
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[SYSCALL_NR_SHMGET] = sys_shmget,
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[SYSCALL_NR_SHMAT] = sys_shmat,
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// System
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[SYSCALL_NR_SYNC] = sys_sync,
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[SYSCALL_NR_MOUNT] = sys_mount,
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[SYSCALL_NRX_UMOUNT] = sys_umount,
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[SYSCALL_NR_UNAME] = sys_uname,
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[SYSCALL_NR_NANOSLEEP] = sys_nanosleep,
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[SYSCALL_NR_GETTIMEOFDAY] = sys_gettimeofday,
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[SYSCALL_NR_REBOOT] = sys_reboot,
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[SYSCALL_NRX_MODULE_LOAD] = sys_module_load,
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[SYSCALL_NRX_MODULE_UNLOAD] = sys_module_unload,
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#if defined(ENABLE_NET)
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// Network
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[SYSCALL_NR_SOCKET] = sys_socket,
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[SYSCALL_NR_CONNECT] = sys_connect,
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[SYSCALL_NR_ACCEPT] = sys_accept,
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[SYSCALL_NR_SENDTO] = sys_sendto,
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[SYSCALL_NR_RECVFROM] = sys_recvfrom,
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[SYSCALL_NR_BIND] = sys_bind,
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[SYSCALL_NR_SETSOCKOPT] = sys_setsockopt,
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[SYSCALL_NRX_NETCTL] = sys_netctl,
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#endif
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// Extension
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[SYSCALL_NRX_TRACE] = sys_debug_trace,
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};
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int syscall_undefined(uint64_t rax) {
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debugs(DEBUG_DEFAULT, "\033[41m");
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if (sched_ready) {
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thread_dump(DEBUG_DEFAULT, thread_self);
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}
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debugf(DEBUG_DEFAULT, "Undefined system call: %d\n", rax);
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debugs(DEBUG_DEFAULT, "\033[0m");
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thread_signal(thread_self, SIGSYS);
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// TODO: more context?
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return -ENOSYS;
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}
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void syscall_init(void) {
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// LSTAR = syscall_entry
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wrmsr(MSR_IA32_LSTAR, (uintptr_t) syscall_entry);
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// SFMASK = (1 << 9) /* IF */
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wrmsr(MSR_IA32_SFMASK, (1 << 9));
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// STAR = ((ss3 - 8) << 48) | (cs0 << 32)
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wrmsr(MSR_IA32_STAR, ((uint64_t) (0x1B - 8) << 48) | ((uint64_t) 0x08 << 32));
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// Set SCE bit
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uint64_t efer = rdmsr(MSR_IA32_EFER);
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efer |= (1 << 0);
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wrmsr(MSR_IA32_EFER, efer);
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}
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