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| author | Frédéric Pétrot | 2022-07-10 13:04:51 +0200 |
|---|---|---|
| committer | Alistair Francis | 2022-09-07 09:18:32 +0200 |
| commit | 3363277525958e173b4526f9dca225e125b1a5de (patch) | |
| tree | 58eb5fb7b67a6839480d710a9347e8402bf1101b /disas/riscv.c | |
| parent | target/riscv: Force disable extensions if priv spec version does not match (diff) | |
| download | qemu-3363277525958e173b4526f9dca225e125b1a5de.tar.gz qemu-3363277525958e173b4526f9dca225e125b1a5de.tar.xz qemu-3363277525958e173b4526f9dca225e125b1a5de.zip | |
target/riscv: fix shifts shamt value for rv128c
For rv128c shifts, a shamt of 0 is a shamt of 64, while for rv32c/rv64c
it stays 0 and is a hint instruction that does not change processor state.
For rv128c right shifts, the 6-bit shamt is in addition sign extended to
7 bits.
Signed-off-by: Frédéric Pétrot <frederic.petrot@univ-grenoble-alpes.fr>
Reviewed-by: Weiwei Li <liweiwei@iscas.ac.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220710110451.245567-1-frederic.petrot@univ-grenoble-alpes.fr>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Diffstat (limited to 'disas/riscv.c')
| -rw-r--r-- | disas/riscv.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/disas/riscv.c b/disas/riscv.c index 7af6afc8fa..489c2ae5e8 100644 --- a/disas/riscv.c +++ b/disas/riscv.c @@ -2402,10 +2402,25 @@ static int32_t operand_sbimm12(rv_inst inst) ((inst << 56) >> 63) << 11; } -static uint32_t operand_cimmsh6(rv_inst inst) +static uint32_t operand_cimmshl6(rv_inst inst, rv_isa isa) { - return ((inst << 51) >> 63) << 5 | + int imm = ((inst << 51) >> 63) << 5 | (inst << 57) >> 59; + if (isa == rv128) { + imm = imm ? imm : 64; + } + return imm; +} + +static uint32_t operand_cimmshr6(rv_inst inst, rv_isa isa) +{ + int imm = ((inst << 51) >> 63) << 5 | + (inst << 57) >> 59; + if (isa == rv128) { + imm = imm | (imm & 32) << 1; + imm = imm ? imm : 64; + } + return imm; } static int32_t operand_cimmi(rv_inst inst) @@ -2529,7 +2544,7 @@ static uint32_t operand_rnum(rv_inst inst) /* decode operands */ -static void decode_inst_operands(rv_decode *dec) +static void decode_inst_operands(rv_decode *dec, rv_isa isa) { rv_inst inst = dec->inst; dec->codec = opcode_data[dec->op].codec; @@ -2652,7 +2667,7 @@ static void decode_inst_operands(rv_decode *dec) case rv_codec_cb_sh6: dec->rd = dec->rs1 = operand_crs1rdq(inst) + 8; dec->rs2 = rv_ireg_zero; - dec->imm = operand_cimmsh6(inst); + dec->imm = operand_cimmshr6(inst, isa); break; case rv_codec_ci: dec->rd = dec->rs1 = operand_crs1rd(inst); @@ -2667,7 +2682,7 @@ static void decode_inst_operands(rv_decode *dec) case rv_codec_ci_sh6: dec->rd = dec->rs1 = operand_crs1rd(inst); dec->rs2 = rv_ireg_zero; - dec->imm = operand_cimmsh6(inst); + dec->imm = operand_cimmshl6(inst, isa); break; case rv_codec_ci_16sp: dec->rd = rv_ireg_sp; @@ -3193,7 +3208,7 @@ disasm_inst(char *buf, size_t buflen, rv_isa isa, uint64_t pc, rv_inst inst) dec.pc = pc; dec.inst = inst; decode_inst_opcode(&dec, isa); - decode_inst_operands(&dec); + decode_inst_operands(&dec, isa); decode_inst_decompress(&dec, isa); decode_inst_lift_pseudo(&dec); format_inst(buf, buflen, 16, &dec); |