Messages in this thread Patch in this message | | | From | Björn Töpel <> | Subject | [PATCH 2/2] scripts/decodecode: Add support for RISC-V | Date | Fri, 13 Jan 2023 15:45:52 +0100 |
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From: Björn Töpel <bjorn@rivosinc.com>
RISC-V has some GNU disassembly quirks, e.g. it requires '-D' to properly disassemble .byte directives similar to Arm [1]. Further, GNU objdump groups RISC-V instruction by 2 or 4 byte chunks, instead doing byte-for-byte.
Add the required switches, and translate from short/word to bytes when ARCH is "riscv".
An example how to invoke decodecode for RISC-V: $ echo 'Code: 64 c9 29 a0 17 d4 1f 01 13 04 44 b8 93 92 38 00 16 94 00 60 <02> 94 aa e8' | \ AFLAGS="-march=rv64imac_zicbom_zihintpause" \ ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- ./scripts/decodecode Code: 64 c9 29 a0 17 d4 1f 01 13 04 44 b8 93 92 38 00 16 94 00 60 <02> 94 aa e8 All code ======== 0: c964 c.sw s1,84(a0) 2: a029 c.j c <.text+0xc> 4: 011fd417 auipc s0,0x11fd 8: b8440413 addi s0,s0,-1148 # 11fcb88 <.text+0x11fcb88> c: 00389293 slli t0,a7,0x3 10: 9416 c.add s0,t0 12: 6000 c.ld s0,0(s0) 14:* 9402 c.jalr s0 <-- trapping instruction 16: e8aa c.sdsp a0,80(sp)
Code starting with the faulting instruction =========================================== 0: 9402 c.jalr s0 2: e8aa c.sdsp a0,80(sp)
[1] https://sourceware.org/bugzilla/show_bug.cgi?id=10263
Signed-off-by: Björn Töpel <bjorn@rivosinc.com> --- scripts/decodecode | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/scripts/decodecode b/scripts/decodecode index b28fd2686561..8fe71c292381 100755 --- a/scripts/decodecode +++ b/scripts/decodecode @@ -93,6 +93,11 @@ disas() { ${CROSS_COMPILE}strip $t.o fi + if [ "$ARCH" = "riscv" ]; then + OBJDUMPFLAGS="-M no-aliases --section=.text -D" + ${CROSS_COMPILE}strip $t.o + fi + if [ $pc_sub -ne 0 ]; then if [ $PC ]; then adj_vma=$(( $PC - $pc_sub )) @@ -126,8 +131,13 @@ get_substr_opcode_bytes_num() do substr+="$opc" + opcode="$substr" + if [ "$ARCH" = "riscv" ]; then + opcode=$(echo $opcode | tr ' ' '\n' | tac | tr -d '\n') + fi + # return if opcode bytes do not match @opline anymore - if ! echo $opline | grep -q "$substr"; + if ! echo $opline | grep -q "$opcode"; then break fi -- 2.37.2
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