cmd/asm: riscv64 assembler does not check the shift amount input #57755
Description
What did you do?
TEXT ·SLLI128(SB),NOSPLIT,$0-0
MOV rs+0(FP), A1
SLLI $128, A1, A2
MOV A2, rd+8(FP)
RET
compile this assembly code with GOARCH=riscv64.
What did you expect to see?
got a error shift amount out of range 0 to 63
What did you see instead?
assemble successfully but got a illegal instruction fault in run time.
SIGILL: illegal instruction
PC=0x6494c m=0 sigcode=1
instruction bytes: 0x13 0x96 0x5 0x8 0x23 0x38 0xc1 0x0 0x67 0x80 0x0 0x0 0x0 0x0 0x0 0x0
goroutine 1 [running]:
main.SLLI128(0x1)
riscv1/asm.s:9 +0x4 fp=0x3f84032768 sp=0x3f84032768 pc=0x6494c
main.main()
riscv1/main.go:52 +0x28 fp=0x3f84032780 sp=0x3f84032768 pc=0x64928
runtime.main()
runtime/proc.go:250 +0x218 fp=0x3f840327d8 sp=0x3f84032780 pc=0x3dcd8
runtime.goexit()
runtime/asm_riscv64.s:512 +0x4 fp=0x3f840327d8 sp=0x3f840327d8 pc=0x61e7c