本文檔描述了 Linux/LoongArch 的系統(tǒng)調(diào)用 ABI。
由于當前內(nèi)核僅有 64 位版本，以下的描述均視為遵循 LP64* 的過程調(diào)用約定。

系統(tǒng)調(diào)用號與參數(shù)

正如其他新近的架構(gòu)移植，絕大部分 Linux/LoongArch 系統(tǒng)調(diào)用號和參數(shù)都復(fù)用asm-generic 的定義。
倒是有些值得一提的點。

• 沒有 renameat ，請使用 renameat2 。
• 沒有 getrlimit 或者 setrlimit ，請使用 prlimit64 。
• 沒有 fstat 或者 newfstatat ，只有 statx 。
  自己進行系統(tǒng)調(diào)用的底層組件應(yīng)當感知這一事實，如有必要，應(yīng)自帶兼容邏輯。

調(diào)用方式

目前都通過 syscall 0 指令進行系統(tǒng)調(diào)用。
盡管當下內(nèi)核并不檢查指令字中的立即數(shù)域，我們?nèi)匀粡娏医ㄗh保持其為零，
這是為了防止未來它被賦予其他語義而造成您的程序產(chǎn)生非預(yù)期結(jié)果。

系統(tǒng)調(diào)用號應(yīng)被存放于寄存器 a7 。
如系統(tǒng)調(diào)用有參數(shù)，這些參數(shù)應(yīng)如函數(shù)調(diào)用一般，從 a0 到 a6 按順序存放。
系統(tǒng)調(diào)用返回時， a0 存放返回值， t0-t8 則應(yīng)被視作被破壞（clobbered）；
其他寄存器的值都保持不變。

系統(tǒng)調(diào)用號

系統(tǒng)調(diào)用號來自linux kernel, include/uapi/asm-generic/unistd.h文章來源地址http://www.zghlxwxcb.cn/news/detail-466285.html

#define __NR_io_setup 0
#define __NR_io_destroy 1
#define __NR_io_submit 2
#define __NR_io_cancel 3
#define __NR_io_getevents 4

/* fs/xattr.c */
#define __NR_setxattr 5
#define __NR_lsetxattr 6
#define __NR_fsetxattr 7
#define __NR_getxattr 8
#define __NR_lgetxattr 9
#define __NR_fgetxattr 10
#define __NR_listxattr 11
#define __NR_llistxattr 12
#define __NR_flistxattr 13
#define __NR_removexattr 14
#define __NR_lremovexattr 15
#define __NR_fremovexattr 16

/* fs/dcache.c */
#define __NR_getcwd 17

/* fs/cookies.c */
#define __NR_lookup_dcookie 18

/* fs/eventfd.c */
#define __NR_eventfd2 19

/* fs/eventpoll.c */
#define __NR_epoll_create1 20
#define __NR_epoll_ctl 21
#define __NR_epoll_pwait 22

/* fs/fcntl.c */
#define __NR_dup 23
#define __NR_dup3 24
#define __NR3264_fcntl 25

/* fs/inotify_user.c */
#define __NR_inotify_init1 26
#define __NR_inotify_add_watch 27
#define __NR_inotify_rm_watch 28

/* fs/ioctl.c */
#define __NR_ioctl 29

/* fs/ioprio.c */
#define __NR_ioprio_set 30
#define __NR_ioprio_get 31

/* fs/locks.c */
#define __NR_flock 32

/* fs/namei.c */
#define __NR_mknodat 33
#define __NR_mkdirat 34
#define __NR_unlinkat 35
#define __NR_symlinkat 36
#define __NR_linkat 37
/* renameat is superseded with flags by renameat2 */
#define __NR_renameat 38

/* fs/namespace.c */
#define __NR_umount2 39
#define __NR_mount 40
#define __NR_pivot_root 41

/* fs/nfsctl.c */
#define __NR_nfsservctl 42

/* fs/open.c */
#define __NR3264_statfs 43
#define __NR3264_fstatfs 44
#define __NR3264_truncate 45
#define __NR3264_ftruncate 46

#define __NR_fallocate 47
#define __NR_faccessat 48
#define __NR_chdir 49
#define __NR_fchdir 50
#define __NR_chroot 51
#define __NR_fchmod 52
#define __NR_fchmodat 53
#define __NR_fchownat 54
#define __NR_fchown 55
#define __NR_openat 56
#define __NR_close 57
#define __NR_vhangup 58

/* fs/pipe.c */
#define __NR_pipe2 59

/* fs/quota.c */
#define __NR_quotactl 60

/* fs/readdir.c */
#define __NR_getdents64 61

/* fs/read_write.c */
#define __NR3264_lseek 62
#define __NR_read 63
#define __NR_write 64
#define __NR_readv 65
#define __NR_writev 66
#define __NR_pread64 67
#define __NR_pwrite64 68
#define __NR_preadv 69
#define __NR_pwritev 70

/* fs/sendfile.c */
#define __NR3264_sendfile 71

/* fs/select.c */
#define __NR_pselect6 72
#define __NR_ppoll 73

/* fs/signalfd.c */
#define __NR_signalfd4 74

/* fs/splice.c */
#define __NR_vmsplice 75
#define __NR_splice 76
#define __NR_tee 77

/* fs/stat.c */
#define __NR_readlinkat 78
#define __NR3264_fstatat 79
#define __NR3264_fstat 80

/* fs/sync.c */
#define __NR_sync 81
#define __NR_fsync 82
#define __NR_fdatasync 83
#define __NR_sync_file_range2 84
#define __NR_sync_file_range 84

/* fs/timerfd.c */
#define __NR_timerfd_create 85
#define __NR_timerfd_settime 86
#define __NR_timerfd_gettime 87

/* fs/utimes.c */
#define __NR_utimensat 88

/* kernel/acct.c */
#define __NR_acct 89

/* kernel/capability.c */
#define __NR_capget 90
#define __NR_capset 91

/* kernel/exec_domain.c */
#define __NR_personality 92

/* kernel/exit.c */
#define __NR_exit 93
#define __NR_exit_group 94
#define __NR_waitid 95

/* kernel/fork.c */
#define __NR_set_tid_address 96
#define __NR_unshare 97

/* kernel/futex.c */
#define __NR_futex 98
#define __NR_set_robust_list 99
#define __NR_get_robust_list 100

/* kernel/hrtimer.c */
#define __NR_nanosleep 101

/* kernel/itimer.c */
#define __NR_getitimer 102
#define __NR_setitimer 103

/* kernel/kexec.c */
#define __NR_kexec_load 104

/* kernel/module.c */
#define __NR_init_module 105
#define __NR_delete_module 106

/* kernel/posix-timers.c */
#define __NR_timer_create 107
#define __NR_timer_gettime 108
#define __NR_timer_getoverrun 109
#define __NR_timer_settime 110
#define __NR_timer_delete 111
#define __NR_clock_settime 112
#define __NR_clock_gettime 113
#define __NR_clock_getres 114
#define __NR_clock_nanosleep 115

/* kernel/printk.c */
#define __NR_syslog 116

/* kernel/ptrace.c */
#define __NR_ptrace 117

/* kernel/sched/core.c */
#define __NR_sched_setparam 118
#define __NR_sched_setscheduler 119
#define __NR_sched_getscheduler 120
#define __NR_sched_getparam 121
#define __NR_sched_setaffinity 122
#define __NR_sched_getaffinity 123
#define __NR_sched_yield 124
#define __NR_sched_get_priority_max 125
#define __NR_sched_get_priority_min 126
#define __NR_sched_rr_get_interval 127

/* kernel/signal.c */
#define __NR_restart_syscall 128
#define __NR_kill 129
#define __NR_tkill 130
#define __NR_tgkill 131
#define __NR_sigaltstack 132
#define __NR_rt_sigsuspend 133
#define __NR_rt_sigaction 134
#define __NR_rt_sigprocmask 135
#define __NR_rt_sigpending 136
#define __NR_rt_sigtimedwait 137
#define __NR_rt_sigqueueinfo 138
#define __NR_rt_sigreturn 139

/* kernel/sys.c */
#define __NR_setpriority 140
#define __NR_getpriority 141
#define __NR_reboot 142
#define __NR_setregid 143
#define __NR_setgid 144
#define __NR_setreuid 145
#define __NR_setuid 146
#define __NR_setresuid 147
#define __NR_getresuid 148
#define __NR_setresgid 149
#define __NR_getresgid 150
#define __NR_setfsuid 151
#define __NR_setfsgid 152
#define __NR_times 153
#define __NR_setpgid 154
#define __NR_getpgid 155
#define __NR_getsid 156
#define __NR_setsid 157
#define __NR_getgroups 158
#define __NR_setgroups 159
#define __NR_uname 160
#define __NR_sethostname 161
#define __NR_setdomainname 162

/* getrlimit and setrlimit are superseded with prlimit64 */
#define __NR_getrlimit 163
#define __NR_setrlimit 164

#define __NR_getrusage 165
#define __NR_umask 166
#define __NR_prctl 167
#define __NR_getcpu 168

/* kernel/time.c */
#define __NR_gettimeofday 169
#define __NR_settimeofday 170
#define __NR_adjtimex 171

/* kernel/sys.c */
#define __NR_getpid 172
#define __NR_getppid 173
#define __NR_getuid 174
#define __NR_geteuid 175
#define __NR_getgid 176
#define __NR_getegid 177
#define __NR_gettid 178
#define __NR_sysinfo 179

/* ipc/mqueue.c */
#define __NR_mq_open 180
#define __NR_mq_unlink 181
#define __NR_mq_timedsend 182
#define __NR_mq_timedreceive 183
#define __NR_mq_notify 184
#define __NR_mq_getsetattr 185

/* ipc/msg.c */
#define __NR_msgget 186
#define __NR_msgctl 187
#define __NR_msgrcv 188
#define __NR_msgsnd 189

/* ipc/sem.c */
#define __NR_semget 190
#define __NR_semctl 191
#define __NR_semtimedop 192
#define __NR_semop 193

/* ipc/shm.c */
#define __NR_shmget 194
#define __NR_shmctl 195
#define __NR_shmat 196
#define __NR_shmdt 197

/* net/socket.c */
#define __NR_socket 198
#define __NR_socketpair 199
#define __NR_bind 200
#define __NR_listen 201
#define __NR_accept 202
#define __NR_connect 203
#define __NR_getsockname 204
#define __NR_getpeername 205
#define __NR_sendto 206
#define __NR_recvfrom 207
#define __NR_setsockopt 208
#define __NR_getsockopt 209
#define __NR_shutdown 210
#define __NR_sendmsg 211
#define __NR_recvmsg 212

/* mm/filemap.c */
#define __NR_readahead 213

/* mm/nommu.c, also with MMU */
#define __NR_brk 214
#define __NR_munmap 215
#define __NR_mremap 216

/* security/keys/keyctl.c */
#define __NR_add_key 217
#define __NR_request_key 218
#define __NR_keyctl 219

/* arch/example/kernel/sys_example.c */
#define __NR_clone 220
#define __NR_execve 221

#define __NR3264_mmap 222

/* mm/fadvise.c */
#define __NR3264_fadvise64 223

/* mm/, CONFIG_MMU only */
#define __NR_swapon 224
#define __NR_swapoff 225
#define __NR_mprotect 226
#define __NR_msync 227
#define __NR_mlock 228
#define __NR_munlock 229
#define __NR_mlockall 230
#define __NR_munlockall 231
#define __NR_mincore 232
#define __NR_madvise 233
#define __NR_remap_file_pages 234
#define __NR_mbind 235
#define __NR_get_mempolicy 236
#define __NR_set_mempolicy 237
#define __NR_migrate_pages 238
#define __NR_move_pages 239

#define __NR_rt_tgsigqueueinfo 240
#define __NR_perf_event_open 241
#define __NR_accept4 242
#define __NR_recvmmsg 243

/*
 * Architectures may provide up to 16 syscalls of their own
 * starting with this value.
 */
#define __NR_arch_specific_syscall 244

#define __NR_wait4 260
#define __NR_prlimit64 261
#define __NR_fanotify_init 262
#define __NR_fanotify_mark 263
#define __NR_name_to_handle_at         264
#define __NR_open_by_handle_at         265
#define __NR_clock_adjtime 266
#define __NR_syncfs 267
#define __NR_setns 268
#define __NR_sendmmsg 269
#define __NR_process_vm_readv 270
#define __NR_process_vm_writev 271
#define __NR_kcmp 272
#define __NR_finit_module 273
#define __NR_sched_setattr 274
#define __NR_sched_getattr 275
#define __NR_renameat2 276
#define __NR_seccomp 277
#define __NR_getrandom 278
#define __NR_memfd_create 279
#define __NR_bpf 280
#define __NR_execveat 281
#define __NR_userfaultfd 282
#define __NR_membarrier 283
#define __NR_mlock2 284
#define __NR_copy_file_range 285
#define __NR_preadv2 286
#define __NR_pwritev2 287
#define __NR_pkey_mprotect 288
#define __NR_pkey_alloc 289
#define __NR_pkey_free 290
#define __NR_statx 291
#define __NR_io_pgetevents 292
#define __NR_rseq 293
#define __NR_kexec_file_load 294

/* 295 through 402 are unassigned to sync up with generic numbers, don't use */
#define __NR_clock_gettime64 403
#define __NR_clock_settime64 404
#define __NR_clock_adjtime64 405
#define __NR_clock_getres_time64 406
#define __NR_clock_nanosleep_time64 407
#define __NR_timer_gettime64 408
#define __NR_timer_settime64 409
#define __NR_timerfd_gettime64 410
#define __NR_timerfd_settime64 411
#define __NR_utimensat_time64 412
#define __NR_pselect6_time64 413
#define __NR_ppoll_time64 414
#define __NR_io_pgetevents_time64 416
#define __NR_recvmmsg_time64 417
#define __NR_mq_timedsend_time64 418
#define __NR_mq_timedreceive_time64 419
#define __NR_semtimedop_time64 420
#define __NR_rt_sigtimedwait_time64 421
#define __NR_futex_time64 422
#define __NR_sched_rr_get_interval_time64 423

#define __NR_pidfd_send_signal 424
#define __NR_io_uring_setup 425
#define __NR_io_uring_enter 426
#define __NR_io_uring_register 427
#define __NR_open_tree 428
#define __NR_move_mount 429
#define __NR_fsopen 430
#define __NR_fsconfig 431
#define __NR_fspick 433
#define __NR_pidfd_open 434
#define __NR_clone3 435
#define __NR_close_range 436

#define __NR_openat2 437
#define __NR_pidfd_getfd 438
#define __NR_faccessat2 439
#define __NR_process_madvise 440
#define __NR_epoll_pwait2 441
#define __NR_mount_setattr 442
#define __NR_quotactl_fd 443

#define __NR_landlock_create_ruleset 444
#define __NR_landlock_add_rule 445
#define __NR_landlock_restrict_self 446

#define __NR_memfd_secret 447
#define __NR_process_mrelease 448

#define __NR_futex_waitv 449

#define __NR_set_mempolicy_home_node 450

#define __NR_syscalls 451

/*
 * 32 bit systems traditionally used different
 * syscalls for off_t and loff_t arguments, while
 * 64 bit systems only need the off_t version.
 * For new 32 bit platforms, there is no need to
 * implement the old 32 bit off_t syscalls, so
 * they take different names.
 * Here we map the numbers so that both versions
 * use the same syscall table layout.
 */
#define __NR_fcntl __NR3264_fcntl
#define __NR_statfs __NR3264_statfs
#define __NR_fstatfs __NR3264_fstatfs
#define __NR_truncate __NR3264_truncate
#define __NR_ftruncate __NR3264_ftruncate
#define __NR_lseek __NR3264_lseek
#define __NR_sendfile __NR3264_sendfile
#define __NR_newfstatat __NR3264_fstatat
#define __NR_fstat __NR3264_fstat
#define __NR_mmap __NR3264_mmap
#define __NR_fadvise64 __NR3264_fadvise64
#define __NR_stat __NR3264_stat
#define __NR_lstat __NR3264_lstat
#define __NR_fcntl64 __NR3264_fcntl
#define __NR_statfs64 __NR3264_statfs
#define __NR_fstatfs64 __NR3264_fstatfs
#define __NR_truncate64 __NR3264_truncate
#define __NR_ftruncate64 __NR3264_ftruncate
#define __NR_llseek __NR3264_lseek
#define __NR_sendfile64 __NR3264_sendfile
#define __NR_fstatat64 __NR3264_fstatat
#define __NR_fstat64 __NR3264_fstat
#define __NR_mmap2 __NR3264_mmap
#define __NR_fadvise64_64 __NR3264_fadvise64
#define __NR_stat64 __NR3264_stat
#define __NR_lstat64 __NR3264_lstat

到了這里，關(guān)于Linux/LoongArch 系統(tǒng)調(diào)用 ABI的文章就介紹完了。如果您還想了解更多內(nèi)容，請在右上角搜索TOY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！