[PATCH] linux-user: Add support for LoongArch64's old world ABI

WANG Xuerui posted 1 patch 2 weeks, 2 days ago
configs/targets/loongarch64ow-linux-user.mak |   4 +
linux-user/loongarch64/syscall_base_nr.h     | 312 ++++++++++++++++++
linux-user/loongarch64/syscall_nr.h          | 316 +------------------
linux-user/syscall_defs.h                    |   9 +-
scripts/gensyscalls.sh                       |   2 +-
scripts/qemu-binfmt-conf.sh                  |  12 +-
6 files changed, 340 insertions(+), 315 deletions(-)
create mode 100644 configs/targets/loongarch64ow-linux-user.mak
create mode 100644 linux-user/loongarch64/syscall_base_nr.h
[PATCH] linux-user: Add support for LoongArch64's old world ABI
Posted by WANG Xuerui 2 weeks, 2 days ago
From: WANG Xuerui <git@xen0n.name>

This patch adds a "loongarch64ow-linux-user" target and a
corresponding "qemu-loongarch64ow" binary, for supporting user-mode
emulation of old-world LoongArch applications in the wild.

Although the old-world LoongArch is already being (slowly) phased out,
there are already a number of deployments (mainly as a result of
LoongArch's early commercial growth), whose migration path is something
software developers have to care about. Support for user-mode emulation
in addition to system-level emulation would help development of such
migration & compatibility solutions.

The differences we have to care about are:

- TARGET_NSIG: 64 for new-world, 128 for old-world
- System calls: fstat, newfstatat, getrlimit and setrlimit only present
  on old-world

Other incompatibilities exist, but they are irrelevant to emulators like
QEMU, as these are entirely contained within the particular firmware
image or sysroot in use.

Corresponding binfmt_misc magic has been updated to allow somewhat
proper classification of LoongArch executables based on the object ABI
version bitfield [1] in the ELF header's e_flags field. We make the
assumption that all old-world binaries are compiled with an older
toolchain that produce v0 binaries, and that all new-world users have
migrated to object ABI v1 by now -- the initial new-world userbase is
small and technical enough that anyone who has not migrated by now is
simply advised to rebuild world or reinstall.

As for why this cannot be done within one binary: currently TARGET_NSIG
is a compile-time constant, hence it is not currently possible for us
to implement an allegedly more elegant solution, of checking the
.note.ABI-tag section (then falling back to e_flags heuristics if the
optional section is absent).

[1]: https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_e_flags_identifies_abi_type_and_version

Signed-off-by: WANG Xuerui <git@xen0n.name>
---

Tested by successfully emulating a Loongnix chroot, running old-world
LoongArch apps such as the bundled Kingsoft Office 2019, in addition to
common CLI utilities and some of the MATE apps included in the distro's
live ISO.

 configs/targets/loongarch64ow-linux-user.mak |   4 +
 linux-user/loongarch64/syscall_base_nr.h     | 312 ++++++++++++++++++
 linux-user/loongarch64/syscall_nr.h          | 316 +------------------
 linux-user/syscall_defs.h                    |   9 +-
 scripts/gensyscalls.sh                       |   2 +-
 scripts/qemu-binfmt-conf.sh                  |  12 +-
 6 files changed, 340 insertions(+), 315 deletions(-)
 create mode 100644 configs/targets/loongarch64ow-linux-user.mak
 create mode 100644 linux-user/loongarch64/syscall_base_nr.h

diff --git a/configs/targets/loongarch64ow-linux-user.mak b/configs/targets/loongarch64ow-linux-user.mak
new file mode 100644
index 0000000000..41eb8c16a7
--- /dev/null
+++ b/configs/targets/loongarch64ow-linux-user.mak
@@ -0,0 +1,4 @@
+# Default configuration for loongarch64-linux-user
+TARGET_ARCH=loongarch64
+TARGET_BASE_ARCH=loongarch
+TARGET_ABI_LOONGARCH64_OW=y
diff --git a/linux-user/loongarch64/syscall_base_nr.h b/linux-user/loongarch64/syscall_base_nr.h
new file mode 100644
index 0000000000..f84434bfa2
--- /dev/null
+++ b/linux-user/loongarch64/syscall_base_nr.h
@@ -0,0 +1,312 @@
+/*
+ * This file contains the system call numbers.
+ * Do not modify.
+ * This file is generated by scripts/gensyscalls.sh
+ */
+#ifndef LINUX_USER_LOONGARCH_SYSCALL_BASE_NR_H
+#define LINUX_USER_LOONGARCH_SYSCALL_BASE_NR_H
+
+#define TARGET_NR_io_setup 0
+#define TARGET_NR_io_destroy 1
+#define TARGET_NR_io_submit 2
+#define TARGET_NR_io_cancel 3
+#define TARGET_NR_io_getevents 4
+#define TARGET_NR_setxattr 5
+#define TARGET_NR_lsetxattr 6
+#define TARGET_NR_fsetxattr 7
+#define TARGET_NR_getxattr 8
+#define TARGET_NR_lgetxattr 9
+#define TARGET_NR_fgetxattr 10
+#define TARGET_NR_listxattr 11
+#define TARGET_NR_llistxattr 12
+#define TARGET_NR_flistxattr 13
+#define TARGET_NR_removexattr 14
+#define TARGET_NR_lremovexattr 15
+#define TARGET_NR_fremovexattr 16
+#define TARGET_NR_getcwd 17
+#define TARGET_NR_lookup_dcookie 18
+#define TARGET_NR_eventfd2 19
+#define TARGET_NR_epoll_create1 20
+#define TARGET_NR_epoll_ctl 21
+#define TARGET_NR_epoll_pwait 22
+#define TARGET_NR_dup 23
+#define TARGET_NR_dup3 24
+#define TARGET_NR_fcntl 25
+#define TARGET_NR_inotify_init1 26
+#define TARGET_NR_inotify_add_watch 27
+#define TARGET_NR_inotify_rm_watch 28
+#define TARGET_NR_ioctl 29
+#define TARGET_NR_ioprio_set 30
+#define TARGET_NR_ioprio_get 31
+#define TARGET_NR_flock 32
+#define TARGET_NR_mknodat 33
+#define TARGET_NR_mkdirat 34
+#define TARGET_NR_unlinkat 35
+#define TARGET_NR_symlinkat 36
+#define TARGET_NR_linkat 37
+#define TARGET_NR_umount2 39
+#define TARGET_NR_mount 40
+#define TARGET_NR_pivot_root 41
+#define TARGET_NR_nfsservctl 42
+#define TARGET_NR_statfs 43
+#define TARGET_NR_fstatfs 44
+#define TARGET_NR_truncate 45
+#define TARGET_NR_ftruncate 46
+#define TARGET_NR_fallocate 47
+#define TARGET_NR_faccessat 48
+#define TARGET_NR_chdir 49
+#define TARGET_NR_fchdir 50
+#define TARGET_NR_chroot 51
+#define TARGET_NR_fchmod 52
+#define TARGET_NR_fchmodat 53
+#define TARGET_NR_fchownat 54
+#define TARGET_NR_fchown 55
+#define TARGET_NR_openat 56
+#define TARGET_NR_close 57
+#define TARGET_NR_vhangup 58
+#define TARGET_NR_pipe2 59
+#define TARGET_NR_quotactl 60
+#define TARGET_NR_getdents64 61
+#define TARGET_NR_lseek 62
+#define TARGET_NR_read 63
+#define TARGET_NR_write 64
+#define TARGET_NR_readv 65
+#define TARGET_NR_writev 66
+#define TARGET_NR_pread64 67
+#define TARGET_NR_pwrite64 68
+#define TARGET_NR_preadv 69
+#define TARGET_NR_pwritev 70
+#define TARGET_NR_sendfile 71
+#define TARGET_NR_pselect6 72
+#define TARGET_NR_ppoll 73
+#define TARGET_NR_signalfd4 74
+#define TARGET_NR_vmsplice 75
+#define TARGET_NR_splice 76
+#define TARGET_NR_tee 77
+#define TARGET_NR_readlinkat 78
+#define TARGET_NR_sync 81
+#define TARGET_NR_fsync 82
+#define TARGET_NR_fdatasync 83
+#define TARGET_NR_sync_file_range 84
+#define TARGET_NR_timerfd_create 85
+#define TARGET_NR_timerfd_settime 86
+#define TARGET_NR_timerfd_gettime 87
+#define TARGET_NR_utimensat 88
+#define TARGET_NR_acct 89
+#define TARGET_NR_capget 90
+#define TARGET_NR_capset 91
+#define TARGET_NR_personality 92
+#define TARGET_NR_exit 93
+#define TARGET_NR_exit_group 94
+#define TARGET_NR_waitid 95
+#define TARGET_NR_set_tid_address 96
+#define TARGET_NR_unshare 97
+#define TARGET_NR_futex 98
+#define TARGET_NR_set_robust_list 99
+#define TARGET_NR_get_robust_list 100
+#define TARGET_NR_nanosleep 101
+#define TARGET_NR_getitimer 102
+#define TARGET_NR_setitimer 103
+#define TARGET_NR_kexec_load 104
+#define TARGET_NR_init_module 105
+#define TARGET_NR_delete_module 106
+#define TARGET_NR_timer_create 107
+#define TARGET_NR_timer_gettime 108
+#define TARGET_NR_timer_getoverrun 109
+#define TARGET_NR_timer_settime 110
+#define TARGET_NR_timer_delete 111
+#define TARGET_NR_clock_settime 112
+#define TARGET_NR_clock_gettime 113
+#define TARGET_NR_clock_getres 114
+#define TARGET_NR_clock_nanosleep 115
+#define TARGET_NR_syslog 116
+#define TARGET_NR_ptrace 117
+#define TARGET_NR_sched_setparam 118
+#define TARGET_NR_sched_setscheduler 119
+#define TARGET_NR_sched_getscheduler 120
+#define TARGET_NR_sched_getparam 121
+#define TARGET_NR_sched_setaffinity 122
+#define TARGET_NR_sched_getaffinity 123
+#define TARGET_NR_sched_yield 124
+#define TARGET_NR_sched_get_priority_max 125
+#define TARGET_NR_sched_get_priority_min 126
+#define TARGET_NR_sched_rr_get_interval 127
+#define TARGET_NR_restart_syscall 128
+#define TARGET_NR_kill 129
+#define TARGET_NR_tkill 130
+#define TARGET_NR_tgkill 131
+#define TARGET_NR_sigaltstack 132
+#define TARGET_NR_rt_sigsuspend 133
+#define TARGET_NR_rt_sigaction 134
+#define TARGET_NR_rt_sigprocmask 135
+#define TARGET_NR_rt_sigpending 136
+#define TARGET_NR_rt_sigtimedwait 137
+#define TARGET_NR_rt_sigqueueinfo 138
+#define TARGET_NR_rt_sigreturn 139
+#define TARGET_NR_setpriority 140
+#define TARGET_NR_getpriority 141
+#define TARGET_NR_reboot 142
+#define TARGET_NR_setregid 143
+#define TARGET_NR_setgid 144
+#define TARGET_NR_setreuid 145
+#define TARGET_NR_setuid 146
+#define TARGET_NR_setresuid 147
+#define TARGET_NR_getresuid 148
+#define TARGET_NR_setresgid 149
+#define TARGET_NR_getresgid 150
+#define TARGET_NR_setfsuid 151
+#define TARGET_NR_setfsgid 152
+#define TARGET_NR_times 153
+#define TARGET_NR_setpgid 154
+#define TARGET_NR_getpgid 155
+#define TARGET_NR_getsid 156
+#define TARGET_NR_setsid 157
+#define TARGET_NR_getgroups 158
+#define TARGET_NR_setgroups 159
+#define TARGET_NR_uname 160
+#define TARGET_NR_sethostname 161
+#define TARGET_NR_setdomainname 162
+#define TARGET_NR_getrusage 165
+#define TARGET_NR_umask 166
+#define TARGET_NR_prctl 167
+#define TARGET_NR_getcpu 168
+#define TARGET_NR_gettimeofday 169
+#define TARGET_NR_settimeofday 170
+#define TARGET_NR_adjtimex 171
+#define TARGET_NR_getpid 172
+#define TARGET_NR_getppid 173
+#define TARGET_NR_getuid 174
+#define TARGET_NR_geteuid 175
+#define TARGET_NR_getgid 176
+#define TARGET_NR_getegid 177
+#define TARGET_NR_gettid 178
+#define TARGET_NR_sysinfo 179
+#define TARGET_NR_mq_open 180
+#define TARGET_NR_mq_unlink 181
+#define TARGET_NR_mq_timedsend 182
+#define TARGET_NR_mq_timedreceive 183
+#define TARGET_NR_mq_notify 184
+#define TARGET_NR_mq_getsetattr 185
+#define TARGET_NR_msgget 186
+#define TARGET_NR_msgctl 187
+#define TARGET_NR_msgrcv 188
+#define TARGET_NR_msgsnd 189
+#define TARGET_NR_semget 190
+#define TARGET_NR_semctl 191
+#define TARGET_NR_semtimedop 192
+#define TARGET_NR_semop 193
+#define TARGET_NR_shmget 194
+#define TARGET_NR_shmctl 195
+#define TARGET_NR_shmat 196
+#define TARGET_NR_shmdt 197
+#define TARGET_NR_socket 198
+#define TARGET_NR_socketpair 199
+#define TARGET_NR_bind 200
+#define TARGET_NR_listen 201
+#define TARGET_NR_accept 202
+#define TARGET_NR_connect 203
+#define TARGET_NR_getsockname 204
+#define TARGET_NR_getpeername 205
+#define TARGET_NR_sendto 206
+#define TARGET_NR_recvfrom 207
+#define TARGET_NR_setsockopt 208
+#define TARGET_NR_getsockopt 209
+#define TARGET_NR_shutdown 210
+#define TARGET_NR_sendmsg 211
+#define TARGET_NR_recvmsg 212
+#define TARGET_NR_readahead 213
+#define TARGET_NR_brk 214
+#define TARGET_NR_munmap 215
+#define TARGET_NR_mremap 216
+#define TARGET_NR_add_key 217
+#define TARGET_NR_request_key 218
+#define TARGET_NR_keyctl 219
+#define TARGET_NR_clone 220
+#define TARGET_NR_execve 221
+#define TARGET_NR_mmap 222
+#define TARGET_NR_fadvise64 223
+#define TARGET_NR_swapon 224
+#define TARGET_NR_swapoff 225
+#define TARGET_NR_mprotect 226
+#define TARGET_NR_msync 227
+#define TARGET_NR_mlock 228
+#define TARGET_NR_munlock 229
+#define TARGET_NR_mlockall 230
+#define TARGET_NR_munlockall 231
+#define TARGET_NR_mincore 232
+#define TARGET_NR_madvise 233
+#define TARGET_NR_remap_file_pages 234
+#define TARGET_NR_mbind 235
+#define TARGET_NR_get_mempolicy 236
+#define TARGET_NR_set_mempolicy 237
+#define TARGET_NR_migrate_pages 238
+#define TARGET_NR_move_pages 239
+#define TARGET_NR_rt_tgsigqueueinfo 240
+#define TARGET_NR_perf_event_open 241
+#define TARGET_NR_accept4 242
+#define TARGET_NR_recvmmsg 243
+#define TARGET_NR_arch_specific_syscall 244
+#define TARGET_NR_wait4 260
+#define TARGET_NR_prlimit64 261
+#define TARGET_NR_fanotify_init 262
+#define TARGET_NR_fanotify_mark 263
+#define TARGET_NR_name_to_handle_at 264
+#define TARGET_NR_open_by_handle_at 265
+#define TARGET_NR_clock_adjtime 266
+#define TARGET_NR_syncfs 267
+#define TARGET_NR_setns 268
+#define TARGET_NR_sendmmsg 269
+#define TARGET_NR_process_vm_readv 270
+#define TARGET_NR_process_vm_writev 271
+#define TARGET_NR_kcmp 272
+#define TARGET_NR_finit_module 273
+#define TARGET_NR_sched_setattr 274
+#define TARGET_NR_sched_getattr 275
+#define TARGET_NR_renameat2 276
+#define TARGET_NR_seccomp 277
+#define TARGET_NR_getrandom 278
+#define TARGET_NR_memfd_create 279
+#define TARGET_NR_bpf 280
+#define TARGET_NR_execveat 281
+#define TARGET_NR_userfaultfd 282
+#define TARGET_NR_membarrier 283
+#define TARGET_NR_mlock2 284
+#define TARGET_NR_copy_file_range 285
+#define TARGET_NR_preadv2 286
+#define TARGET_NR_pwritev2 287
+#define TARGET_NR_pkey_mprotect 288
+#define TARGET_NR_pkey_alloc 289
+#define TARGET_NR_pkey_free 290
+#define TARGET_NR_statx 291
+#define TARGET_NR_io_pgetevents 292
+#define TARGET_NR_rseq 293
+#define TARGET_NR_kexec_file_load 294
+#define TARGET_NR_pidfd_send_signal 424
+#define TARGET_NR_io_uring_setup 425
+#define TARGET_NR_io_uring_enter 426
+#define TARGET_NR_io_uring_register 427
+#define TARGET_NR_open_tree 428
+#define TARGET_NR_move_mount 429
+#define TARGET_NR_fsopen 430
+#define TARGET_NR_fsconfig 431
+#define TARGET_NR_fsmount 432
+#define TARGET_NR_fspick 433
+#define TARGET_NR_pidfd_open 434
+#define TARGET_NR_clone3 435
+#define TARGET_NR_close_range 436
+#define TARGET_NR_openat2 437
+#define TARGET_NR_pidfd_getfd 438
+#define TARGET_NR_faccessat2 439
+#define TARGET_NR_process_madvise 440
+#define TARGET_NR_epoll_pwait2 441
+#define TARGET_NR_mount_setattr 442
+#define TARGET_NR_quotactl_fd 443
+#define TARGET_NR_landlock_create_ruleset 444
+#define TARGET_NR_landlock_add_rule 445
+#define TARGET_NR_landlock_restrict_self 446
+#define TARGET_NR_process_mrelease 448
+#define TARGET_NR_futex_waitv 449
+#define TARGET_NR_set_mempolicy_home_node 450
+#define TARGET_NR_syscalls 451
+
+#endif /* LINUX_USER_LOONGARCH_SYSCALL_BASE_NR_H */
diff --git a/linux-user/loongarch64/syscall_nr.h b/linux-user/loongarch64/syscall_nr.h
index be00915adf..a955b39a2e 100644
--- a/linux-user/loongarch64/syscall_nr.h
+++ b/linux-user/loongarch64/syscall_nr.h
@@ -1,312 +1,14 @@
-/*
- * This file contains the system call numbers.
- * Do not modify.
- * This file is generated by scripts/gensyscalls.sh
- */
 #ifndef LINUX_USER_LOONGARCH_SYSCALL_NR_H
 #define LINUX_USER_LOONGARCH_SYSCALL_NR_H
 
-#define TARGET_NR_io_setup 0
-#define TARGET_NR_io_destroy 1
-#define TARGET_NR_io_submit 2
-#define TARGET_NR_io_cancel 3
-#define TARGET_NR_io_getevents 4
-#define TARGET_NR_setxattr 5
-#define TARGET_NR_lsetxattr 6
-#define TARGET_NR_fsetxattr 7
-#define TARGET_NR_getxattr 8
-#define TARGET_NR_lgetxattr 9
-#define TARGET_NR_fgetxattr 10
-#define TARGET_NR_listxattr 11
-#define TARGET_NR_llistxattr 12
-#define TARGET_NR_flistxattr 13
-#define TARGET_NR_removexattr 14
-#define TARGET_NR_lremovexattr 15
-#define TARGET_NR_fremovexattr 16
-#define TARGET_NR_getcwd 17
-#define TARGET_NR_lookup_dcookie 18
-#define TARGET_NR_eventfd2 19
-#define TARGET_NR_epoll_create1 20
-#define TARGET_NR_epoll_ctl 21
-#define TARGET_NR_epoll_pwait 22
-#define TARGET_NR_dup 23
-#define TARGET_NR_dup3 24
-#define TARGET_NR_fcntl 25
-#define TARGET_NR_inotify_init1 26
-#define TARGET_NR_inotify_add_watch 27
-#define TARGET_NR_inotify_rm_watch 28
-#define TARGET_NR_ioctl 29
-#define TARGET_NR_ioprio_set 30
-#define TARGET_NR_ioprio_get 31
-#define TARGET_NR_flock 32
-#define TARGET_NR_mknodat 33
-#define TARGET_NR_mkdirat 34
-#define TARGET_NR_unlinkat 35
-#define TARGET_NR_symlinkat 36
-#define TARGET_NR_linkat 37
-#define TARGET_NR_umount2 39
-#define TARGET_NR_mount 40
-#define TARGET_NR_pivot_root 41
-#define TARGET_NR_nfsservctl 42
-#define TARGET_NR_statfs 43
-#define TARGET_NR_fstatfs 44
-#define TARGET_NR_truncate 45
-#define TARGET_NR_ftruncate 46
-#define TARGET_NR_fallocate 47
-#define TARGET_NR_faccessat 48
-#define TARGET_NR_chdir 49
-#define TARGET_NR_fchdir 50
-#define TARGET_NR_chroot 51
-#define TARGET_NR_fchmod 52
-#define TARGET_NR_fchmodat 53
-#define TARGET_NR_fchownat 54
-#define TARGET_NR_fchown 55
-#define TARGET_NR_openat 56
-#define TARGET_NR_close 57
-#define TARGET_NR_vhangup 58
-#define TARGET_NR_pipe2 59
-#define TARGET_NR_quotactl 60
-#define TARGET_NR_getdents64 61
-#define TARGET_NR_lseek 62
-#define TARGET_NR_read 63
-#define TARGET_NR_write 64
-#define TARGET_NR_readv 65
-#define TARGET_NR_writev 66
-#define TARGET_NR_pread64 67
-#define TARGET_NR_pwrite64 68
-#define TARGET_NR_preadv 69
-#define TARGET_NR_pwritev 70
-#define TARGET_NR_sendfile 71
-#define TARGET_NR_pselect6 72
-#define TARGET_NR_ppoll 73
-#define TARGET_NR_signalfd4 74
-#define TARGET_NR_vmsplice 75
-#define TARGET_NR_splice 76
-#define TARGET_NR_tee 77
-#define TARGET_NR_readlinkat 78
-#define TARGET_NR_sync 81
-#define TARGET_NR_fsync 82
-#define TARGET_NR_fdatasync 83
-#define TARGET_NR_sync_file_range 84
-#define TARGET_NR_timerfd_create 85
-#define TARGET_NR_timerfd_settime 86
-#define TARGET_NR_timerfd_gettime 87
-#define TARGET_NR_utimensat 88
-#define TARGET_NR_acct 89
-#define TARGET_NR_capget 90
-#define TARGET_NR_capset 91
-#define TARGET_NR_personality 92
-#define TARGET_NR_exit 93
-#define TARGET_NR_exit_group 94
-#define TARGET_NR_waitid 95
-#define TARGET_NR_set_tid_address 96
-#define TARGET_NR_unshare 97
-#define TARGET_NR_futex 98
-#define TARGET_NR_set_robust_list 99
-#define TARGET_NR_get_robust_list 100
-#define TARGET_NR_nanosleep 101
-#define TARGET_NR_getitimer 102
-#define TARGET_NR_setitimer 103
-#define TARGET_NR_kexec_load 104
-#define TARGET_NR_init_module 105
-#define TARGET_NR_delete_module 106
-#define TARGET_NR_timer_create 107
-#define TARGET_NR_timer_gettime 108
-#define TARGET_NR_timer_getoverrun 109
-#define TARGET_NR_timer_settime 110
-#define TARGET_NR_timer_delete 111
-#define TARGET_NR_clock_settime 112
-#define TARGET_NR_clock_gettime 113
-#define TARGET_NR_clock_getres 114
-#define TARGET_NR_clock_nanosleep 115
-#define TARGET_NR_syslog 116
-#define TARGET_NR_ptrace 117
-#define TARGET_NR_sched_setparam 118
-#define TARGET_NR_sched_setscheduler 119
-#define TARGET_NR_sched_getscheduler 120
-#define TARGET_NR_sched_getparam 121
-#define TARGET_NR_sched_setaffinity 122
-#define TARGET_NR_sched_getaffinity 123
-#define TARGET_NR_sched_yield 124
-#define TARGET_NR_sched_get_priority_max 125
-#define TARGET_NR_sched_get_priority_min 126
-#define TARGET_NR_sched_rr_get_interval 127
-#define TARGET_NR_restart_syscall 128
-#define TARGET_NR_kill 129
-#define TARGET_NR_tkill 130
-#define TARGET_NR_tgkill 131
-#define TARGET_NR_sigaltstack 132
-#define TARGET_NR_rt_sigsuspend 133
-#define TARGET_NR_rt_sigaction 134
-#define TARGET_NR_rt_sigprocmask 135
-#define TARGET_NR_rt_sigpending 136
-#define TARGET_NR_rt_sigtimedwait 137
-#define TARGET_NR_rt_sigqueueinfo 138
-#define TARGET_NR_rt_sigreturn 139
-#define TARGET_NR_setpriority 140
-#define TARGET_NR_getpriority 141
-#define TARGET_NR_reboot 142
-#define TARGET_NR_setregid 143
-#define TARGET_NR_setgid 144
-#define TARGET_NR_setreuid 145
-#define TARGET_NR_setuid 146
-#define TARGET_NR_setresuid 147
-#define TARGET_NR_getresuid 148
-#define TARGET_NR_setresgid 149
-#define TARGET_NR_getresgid 150
-#define TARGET_NR_setfsuid 151
-#define TARGET_NR_setfsgid 152
-#define TARGET_NR_times 153
-#define TARGET_NR_setpgid 154
-#define TARGET_NR_getpgid 155
-#define TARGET_NR_getsid 156
-#define TARGET_NR_setsid 157
-#define TARGET_NR_getgroups 158
-#define TARGET_NR_setgroups 159
-#define TARGET_NR_uname 160
-#define TARGET_NR_sethostname 161
-#define TARGET_NR_setdomainname 162
-#define TARGET_NR_getrusage 165
-#define TARGET_NR_umask 166
-#define TARGET_NR_prctl 167
-#define TARGET_NR_getcpu 168
-#define TARGET_NR_gettimeofday 169
-#define TARGET_NR_settimeofday 170
-#define TARGET_NR_adjtimex 171
-#define TARGET_NR_getpid 172
-#define TARGET_NR_getppid 173
-#define TARGET_NR_getuid 174
-#define TARGET_NR_geteuid 175
-#define TARGET_NR_getgid 176
-#define TARGET_NR_getegid 177
-#define TARGET_NR_gettid 178
-#define TARGET_NR_sysinfo 179
-#define TARGET_NR_mq_open 180
-#define TARGET_NR_mq_unlink 181
-#define TARGET_NR_mq_timedsend 182
-#define TARGET_NR_mq_timedreceive 183
-#define TARGET_NR_mq_notify 184
-#define TARGET_NR_mq_getsetattr 185
-#define TARGET_NR_msgget 186
-#define TARGET_NR_msgctl 187
-#define TARGET_NR_msgrcv 188
-#define TARGET_NR_msgsnd 189
-#define TARGET_NR_semget 190
-#define TARGET_NR_semctl 191
-#define TARGET_NR_semtimedop 192
-#define TARGET_NR_semop 193
-#define TARGET_NR_shmget 194
-#define TARGET_NR_shmctl 195
-#define TARGET_NR_shmat 196
-#define TARGET_NR_shmdt 197
-#define TARGET_NR_socket 198
-#define TARGET_NR_socketpair 199
-#define TARGET_NR_bind 200
-#define TARGET_NR_listen 201
-#define TARGET_NR_accept 202
-#define TARGET_NR_connect 203
-#define TARGET_NR_getsockname 204
-#define TARGET_NR_getpeername 205
-#define TARGET_NR_sendto 206
-#define TARGET_NR_recvfrom 207
-#define TARGET_NR_setsockopt 208
-#define TARGET_NR_getsockopt 209
-#define TARGET_NR_shutdown 210
-#define TARGET_NR_sendmsg 211
-#define TARGET_NR_recvmsg 212
-#define TARGET_NR_readahead 213
-#define TARGET_NR_brk 214
-#define TARGET_NR_munmap 215
-#define TARGET_NR_mremap 216
-#define TARGET_NR_add_key 217
-#define TARGET_NR_request_key 218
-#define TARGET_NR_keyctl 219
-#define TARGET_NR_clone 220
-#define TARGET_NR_execve 221
-#define TARGET_NR_mmap 222
-#define TARGET_NR_fadvise64 223
-#define TARGET_NR_swapon 224
-#define TARGET_NR_swapoff 225
-#define TARGET_NR_mprotect 226
-#define TARGET_NR_msync 227
-#define TARGET_NR_mlock 228
-#define TARGET_NR_munlock 229
-#define TARGET_NR_mlockall 230
-#define TARGET_NR_munlockall 231
-#define TARGET_NR_mincore 232
-#define TARGET_NR_madvise 233
-#define TARGET_NR_remap_file_pages 234
-#define TARGET_NR_mbind 235
-#define TARGET_NR_get_mempolicy 236
-#define TARGET_NR_set_mempolicy 237
-#define TARGET_NR_migrate_pages 238
-#define TARGET_NR_move_pages 239
-#define TARGET_NR_rt_tgsigqueueinfo 240
-#define TARGET_NR_perf_event_open 241
-#define TARGET_NR_accept4 242
-#define TARGET_NR_recvmmsg 243
-#define TARGET_NR_arch_specific_syscall 244
-#define TARGET_NR_wait4 260
-#define TARGET_NR_prlimit64 261
-#define TARGET_NR_fanotify_init 262
-#define TARGET_NR_fanotify_mark 263
-#define TARGET_NR_name_to_handle_at 264
-#define TARGET_NR_open_by_handle_at 265
-#define TARGET_NR_clock_adjtime 266
-#define TARGET_NR_syncfs 267
-#define TARGET_NR_setns 268
-#define TARGET_NR_sendmmsg 269
-#define TARGET_NR_process_vm_readv 270
-#define TARGET_NR_process_vm_writev 271
-#define TARGET_NR_kcmp 272
-#define TARGET_NR_finit_module 273
-#define TARGET_NR_sched_setattr 274
-#define TARGET_NR_sched_getattr 275
-#define TARGET_NR_renameat2 276
-#define TARGET_NR_seccomp 277
-#define TARGET_NR_getrandom 278
-#define TARGET_NR_memfd_create 279
-#define TARGET_NR_bpf 280
-#define TARGET_NR_execveat 281
-#define TARGET_NR_userfaultfd 282
-#define TARGET_NR_membarrier 283
-#define TARGET_NR_mlock2 284
-#define TARGET_NR_copy_file_range 285
-#define TARGET_NR_preadv2 286
-#define TARGET_NR_pwritev2 287
-#define TARGET_NR_pkey_mprotect 288
-#define TARGET_NR_pkey_alloc 289
-#define TARGET_NR_pkey_free 290
-#define TARGET_NR_statx 291
-#define TARGET_NR_io_pgetevents 292
-#define TARGET_NR_rseq 293
-#define TARGET_NR_kexec_file_load 294
-#define TARGET_NR_pidfd_send_signal 424
-#define TARGET_NR_io_uring_setup 425
-#define TARGET_NR_io_uring_enter 426
-#define TARGET_NR_io_uring_register 427
-#define TARGET_NR_open_tree 428
-#define TARGET_NR_move_mount 429
-#define TARGET_NR_fsopen 430
-#define TARGET_NR_fsconfig 431
-#define TARGET_NR_fsmount 432
-#define TARGET_NR_fspick 433
-#define TARGET_NR_pidfd_open 434
-#define TARGET_NR_clone3 435
-#define TARGET_NR_close_range 436
-#define TARGET_NR_openat2 437
-#define TARGET_NR_pidfd_getfd 438
-#define TARGET_NR_faccessat2 439
-#define TARGET_NR_process_madvise 440
-#define TARGET_NR_epoll_pwait2 441
-#define TARGET_NR_mount_setattr 442
-#define TARGET_NR_quotactl_fd 443
-#define TARGET_NR_landlock_create_ruleset 444
-#define TARGET_NR_landlock_add_rule 445
-#define TARGET_NR_landlock_restrict_self 446
-#define TARGET_NR_process_mrelease 448
-#define TARGET_NR_futex_waitv 449
-#define TARGET_NR_set_mempolicy_home_node 450
-#define TARGET_NR_syscalls 451
+#include "syscall_base_nr.h"
+
+/* Restore various syscalls for old world.  */
+#if defined(TARGET_ABI_LOONGARCH64_OW)
+#define TARGET_NR_newfstatat 79
+#define TARGET_NR_fstat 80
+#define TARGET_NR_getrlimit 163
+#define TARGET_NR_setrlimit 164
+#endif
 
 #endif /* LINUX_USER_LOONGARCH_SYSCALL_NR_H */
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 77864de57f..ac4a571e54 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -450,7 +450,7 @@ struct target_dirent64 {
 #define TARGET_SIG_IGN	((abi_long)1)	/* ignore signal */
 #define TARGET_SIG_ERR	((abi_long)-1)	/* error return from signal */
 
-#ifdef TARGET_MIPS
+#if defined(TARGET_MIPS) || defined(TARGET_ABI_LOONGARCH64_OW)
 #define TARGET_NSIG	   128
 #else
 #define TARGET_NSIG	   64
@@ -2085,7 +2085,8 @@ struct target_stat64  {
 };
 
 #elif defined(TARGET_OPENRISC) || defined(TARGET_NIOS2) \
-        || defined(TARGET_RISCV) || defined(TARGET_HEXAGON)
+        || defined(TARGET_RISCV) || defined(TARGET_HEXAGON) \
+        || defined(TARGET_ABI_LOONGARCH64_OW)
 
 /* These are the asm-generic versions of the stat and stat64 structures */
 
@@ -2113,7 +2114,7 @@ struct target_stat {
     unsigned int __unused5;
 };
 
-#if !defined(TARGET_RISCV64)
+#if !(defined(TARGET_RISCV64) || defined(TARGET_LOONGARCH64))
 #define TARGET_HAS_STRUCT_STAT64
 struct target_stat64 {
     uint64_t st_dev;
@@ -2198,7 +2199,7 @@ struct target_stat64 {
 
 #elif defined(TARGET_LOONGARCH64)
 
-/* LoongArch no newfstatat/fstat syscall. */
+/* LoongArch new-world doesn't have fstat/newfstatat.  */
 
 #else
 #error unsupported CPU
diff --git a/scripts/gensyscalls.sh b/scripts/gensyscalls.sh
index a2f7664b7b..635ac83755 100755
--- a/scripts/gensyscalls.sh
+++ b/scripts/gensyscalls.sh
@@ -100,5 +100,5 @@ generate_syscall_nr openrisc 32 "$output/linux-user/openrisc/syscall_nr.h"
 generate_syscall_nr riscv 32 "$output/linux-user/riscv/syscall32_nr.h"
 generate_syscall_nr riscv 64 "$output/linux-user/riscv/syscall64_nr.h"
 generate_syscall_nr hexagon 32 "$output/linux-user/hexagon/syscall_nr.h"
-generate_syscall_nr loongarch 64 "$output/linux-user/loongarch64/syscall_nr.h"
+generate_syscall_nr loongarch 64 "$output/linux-user/loongarch64/syscall_base_nr.h"
 rm -fr "$TMP"
diff --git a/scripts/qemu-binfmt-conf.sh b/scripts/qemu-binfmt-conf.sh
index 6ef9f118d9..f3d019b0f1 100755
--- a/scripts/qemu-binfmt-conf.sh
+++ b/scripts/qemu-binfmt-conf.sh
@@ -4,7 +4,7 @@
 qemu_target_list="i386 i486 alpha arm armeb sparc sparc32plus sparc64 \
 ppc ppc64 ppc64le m68k mips mipsel mipsn32 mipsn32el mips64 mips64el \
 sh4 sh4eb s390x aarch64 aarch64_be hppa riscv32 riscv64 xtensa xtensaeb \
-microblaze microblazeel or1k x86_64 hexagon loongarch64"
+microblaze microblazeel or1k x86_64 hexagon loongarch64 loongarch64ow"
 
 i386_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'
 i386_mask='\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
@@ -140,10 +140,16 @@ hexagon_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x
 hexagon_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
 hexagon_family=hexagon
 
-loongarch64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02\x01'
-loongarch64_mask='\xff\xff\xff\xff\xff\xff\xff\xfc\x00\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
+# LoongArch New World (by checking e_flags only)
+loongarch64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x40\x00\x00\x00'
+loongarch64_mask='\xff\xff\xff\xff\xff\xff\xff\xfc\x00\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xc0\xff\xff\xff'
 loongarch64_family=loongarch
 
+# LoongArch Old World (by checking e_flags only)
+loongarch64ow_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
+loongarch64ow_mask='\xff\xff\xff\xff\xff\xff\xff\xfc\x00\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xc0\xff\xff\xff'
+loongarch64ow_family=loongarch
+
 qemu_get_family() {
     cpu=${HOST_ARCH:-$(uname -m)}
     case "$cpu" in
-- 
2.39.0
Re: [PATCH] linux-user: Add support for LoongArch64's old world ABI
Posted by Peter Maydell 2 weeks, 2 days ago
On Mon, 23 Jan 2023 at 10:27, WANG Xuerui <i.qemu@xen0n.name> wrote:
>
> From: WANG Xuerui <git@xen0n.name>
>
> This patch adds a "loongarch64ow-linux-user" target and a
> corresponding "qemu-loongarch64ow" binary, for supporting user-mode
> emulation of old-world LoongArch applications in the wild.
>
> Although the old-world LoongArch is already being (slowly) phased out,
> there are already a number of deployments (mainly as a result of
> LoongArch's early commercial growth), whose migration path is something
> software developers have to care about. Support for user-mode emulation
> in addition to system-level emulation would help development of such
> migration & compatibility solutions.

Is this 'old-world' ABI supported by the upstream Linux kernel?
I can't see signs of it from a quick grep. If it isn't, then
I'm not sure if we should support it in QEMU user-mode emulation.
We've always set "upstream Linux" as our definition of what the
official ABI and featureset is for usermode emulation.

thanks
-- PMM
Re: [PATCH] linux-user: Add support for LoongArch64's old world ABI
Posted by WANG Xuerui 2 weeks, 2 days ago
On 1/23/23 18:47, Peter Maydell wrote:
> On Mon, 23 Jan 2023 at 10:27, WANG Xuerui <i.qemu@xen0n.name> wrote:
>>
>> From: WANG Xuerui <git@xen0n.name>
>>
>> This patch adds a "loongarch64ow-linux-user" target and a
>> corresponding "qemu-loongarch64ow" binary, for supporting user-mode
>> emulation of old-world LoongArch applications in the wild.
>>
>> Although the old-world LoongArch is already being (slowly) phased out,
>> there are already a number of deployments (mainly as a result of
>> LoongArch's early commercial growth), whose migration path is something
>> software developers have to care about. Support for user-mode emulation
>> in addition to system-level emulation would help development of such
>> migration & compatibility solutions.
> 
> Is this 'old-world' ABI supported by the upstream Linux kernel?
> I can't see signs of it from a quick grep. If it isn't, then
> I'm not sure if we should support it in QEMU user-mode emulation.
> We've always set "upstream Linux" as our definition of what the
> official ABI and featureset is for usermode emulation.

No, the old-world is not, and will not be, supported by upstream Linux, 
as it is strictly the premature state of this architecture only born for 
commercial reasons.

After sending the patch I've discussed with several other maintainers of 
various LoongArch ports, and it seems even Loongson the corporation 
itself is seeing to completely abandon old-world development in favor of 
a 100% new world future (which is even more courageous than me, an 
unaffiliated hobbyist user). Given the current old-world deployments all 
have commercial support, it's probably best to leave the migration work 
for them and keep upstream clean of any such legacy.

So I'm dropping this patch now, and thanks for the feedback!