diff options
| author | Frédéric Pétrot <frederic.petrot@univ-grenoble-alpes.fr> | 2022-07-10 13:04:51 +0200 |
|---|---|---|
| committer | Alistair Francis <alistair.francis@wdc.com> | 2022-09-07 09:18:32 +0200 |
| commit | 3363277525958e173b4526f9dca225e125b1a5de (patch) | |
| tree | 58eb5fb7b67a6839480d710a9347e8402bf1101b /target | |
| parent | 9a1f054d5bd9acaa82b66e09309482cba9eced63 (diff) | |
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 'target')
| -rw-r--r-- | target/riscv/insn16.decode | 7 | ||||
| -rw-r--r-- | target/riscv/translate.c | 20 |
2 files changed, 22 insertions, 5 deletions
diff --git a/target/riscv/insn16.decode b/target/riscv/insn16.decode index 02c8f61b48..ccfe59f294 100644 --- a/target/riscv/insn16.decode +++ b/target/riscv/insn16.decode @@ -31,7 +31,8 @@ %imm_cb 12:s1 5:2 2:1 10:2 3:2 !function=ex_shift_1 %imm_cj 12:s1 8:1 9:2 6:1 7:1 2:1 11:1 3:3 !function=ex_shift_1 -%shimm_6bit 12:1 2:5 !function=ex_rvc_shifti +%shlimm_6bit 12:1 2:5 !function=ex_rvc_shiftli +%shrimm_6bit 12:1 2:5 !function=ex_rvc_shiftri %uimm_6bit_lq 2:4 12:1 6:1 !function=ex_shift_4 %uimm_6bit_ld 2:3 12:1 5:2 !function=ex_shift_3 %uimm_6bit_lw 2:2 12:1 4:3 !function=ex_shift_2 @@ -82,9 +83,9 @@ @c_addi16sp ... . ..... ..... .. &i imm=%imm_addi16sp rs1=2 rd=2 @c_shift ... . .. ... ..... .. \ - &shift rd=%rs1_3 rs1=%rs1_3 shamt=%shimm_6bit + &shift rd=%rs1_3 rs1=%rs1_3 shamt=%shrimm_6bit @c_shift2 ... . .. ... ..... .. \ - &shift rd=%rd rs1=%rd shamt=%shimm_6bit + &shift rd=%rd rs1=%rd shamt=%shlimm_6bit @c_andi ... . .. ... ..... .. &i imm=%imm_ci rs1=%rs1_3 rd=%rs1_3 diff --git a/target/riscv/translate.c b/target/riscv/translate.c index f8af6daa70..6eeb728462 100644 --- a/target/riscv/translate.c +++ b/target/riscv/translate.c @@ -705,10 +705,26 @@ static int ex_rvc_register(DisasContext *ctx, int reg) return 8 + reg; } -static int ex_rvc_shifti(DisasContext *ctx, int imm) +static int ex_rvc_shiftli(DisasContext *ctx, int imm) { /* For RV128 a shamt of 0 means a shift by 64. */ - return imm ? imm : 64; + if (get_ol(ctx) == MXL_RV128) { + imm = imm ? imm : 64; + } + return imm; +} + +static int ex_rvc_shiftri(DisasContext *ctx, int imm) +{ + /* + * For RV128 a shamt of 0 means a shift by 64, furthermore, for right + * shifts, the shamt is sign-extended. + */ + if (get_ol(ctx) == MXL_RV128) { + imm = imm | (imm & 32) << 1; + imm = imm ? imm : 64; + } + return imm; } /* Include the auto-generated decoder for 32 bit insn */ |