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$ loongarch64-unknown-linux-gnu-gcc -c -o foo.o foo.s
foo.s: Assembler messages:
foo.s:2: Fatal error: Immediate overflow.
format: u10:12
arg: (0+(((~((0)))-(((1))<<(0))+1)&(~((0))>>(64-1-(9)))))

$ clang-16 --target=loongarch64 -fintegrated-as -c -o foo.o foo.s
$ loongarch64-unknown-linux-gnu-objdump -d foo.o

foo.o:     file format elf64-loongarch


Disassembly of section .text:

0000000000000000 <foo>:
   0:   034ffc84        andi            $a0, $a0, 0x3ff

.equ EXIT_SUCCESS, 0
.equ STDOUT, 1
.equ SYS_exit, 93
.equ SYS_write, 64

.section .rodata
msg:
    .string "hello, world!\n"
    len = . - msg

.text
    .globl  _start
_start:
    li.w        $a2, $len          # 必须将 $len 写为 0xf
    la.local    $a1, msg
    li.w        $a0, $STDOUT       # 必须将 $STDOUT 写为 1
    li.w        $a7, $SYS_exit     # 必须将 $SYS_exit 写为 64
    syscall     0x0

    li.w        $a0, $EXIT_SUCCESS  # 必须将 $EXIT_SUCCESS 写为 0
    li.w        $a7, $SYS_exit      # 必须将 SYS_exit 写为 93
    syscall     0x0

$ as -o hello.o hello.S
hello.S: Assembler messages:
hello.S:14: 错误：no match insn: li.w   $a2,$len
hello.S:16: 错误：no match insn: li.w   $a0,$STDOUT
hello.S:17: 错误：no match insn: li.w   $a7,$SYS_exit
hello.S:20: 错误：no match insn: li.w   $a0,$EXIT_SUCCESS
hello.S:21: 错误：no match insn: li.w   $a7,$SYS_exit

$ cat hello.S 
.section .rodata
msg:
    .string "hello, world!\n"
    len = . - msg

.text
    .globl  _start
_start:
    li.w        $a2, 0xf
    la.local    $a1, msg
    li.w        $a0, 1
    li.w        $a7, 64
    syscall     0x0

    li.w        $a0, 0
    li.w        $a7, 93
    syscall     0x0
$ as -o hello.o hello.S
$ ld -o hello hello.o
$ ./hello 
hello, world!