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[Bug gas/28733] New: RISC-V: Bad errors on fence.i and CSR ISA checking
From: |
nelsonc1225 at sourceware dot org |
Subject: |
[Bug gas/28733] New: RISC-V: Bad errors on fence.i and CSR ISA checking |
Date: |
Fri, 31 Dec 2021 01:40:57 +0000 |
https://sourceware.org/bugzilla/show_bug.cgi?id=28733
Bug ID: 28733
Summary: RISC-V: Bad errors on fence.i and CSR ISA checking
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: nelsonc1225 at sourceware dot org
Target Milestone: ---
For now we just report the errors "unrecognized opcode" for the instruction
which needs to enable some specific extensions. For example,
nelson@LAPTOP-QFSGI1F2:~/test$ cat tmp.s
fence.i
csrr a0, fcsr
csrr a0, seed
sh1add a0, a1, a2
nelson@LAPTOP-QFSGI1F2:~/test$
~/binutils-dev/build-elf64-upstream/build-install/bin/riscv64-unknown-elf-as
-march=rv32i2p1 tmp.s -o tmp.o tmp.s: Assembler messages:
tmp.s:1: Error: unrecognized opcode `fence.i'
tmp.s:2: Error: unrecognized opcode `csrr a0,fcsr'
tmp.s:3: Error: unrecognized opcode `csrr a0,seed'
tmp.s:4: Error: unrecognized opcode `sh1add a0,a1,a2'
nelson@LAPTOP-QFSGI1F2:~/test$
~/binutils-dev/build-elf64-upstream/build-install/bin/riscv64-unknown-elf-as
-march=rv32i2p1_zicsr_zifencei_zba tmp.s -o tmp.o
It would great if we can show the more details like "unrecognized opcode
`fence.i', need to enable zifencei extension...". Besides, if we enable the
-mcsr-check, then,
nelson@LAPTOP-QFSGI1F2:~/test$
~/binutils-dev/build-elf64-upstream/build-install/bin/riscv64-unknown-elf-as
-march=rv32i2p1_zicsr_zifencei_zba -mcsr-check tmp.s -o tmp.o
tmp.s: Assembler messages:
tmp.s:2: Warning: invalid CSR `fcsr' for the current ISA
tmp.s:3: Warning: invalid CSR `seed' for the current ISA
This is also the similar works, we can report something like "fcsr needs f
extension" and "seed needs zkr extension".
The more TODO, we can also try to improve the whole error reports in the
riscv_ip, since for now we just report "illegal operand", and sometimes it is
really not friendly to users.
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