target/riscv: Add MAX_INSN_LEN and insn_len
These will be useful in properly ending the TB. Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Acked-by: Ilya Leoshkevich <iii@linux.ibm.com> Tested-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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@ -1022,6 +1022,14 @@ static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
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/* Include decoders for factored-out extensions */
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#include "decode-XVentanaCondOps.c.inc"
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/* The specification allows for longer insns, but not supported by qemu. */
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#define MAX_INSN_LEN 4
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static inline int insn_len(uint16_t first_word)
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{
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return (first_word & 3) == 3 ? 4 : 2;
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}
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static void decode_opc(CPURISCVState *env, DisasContext *ctx, uint16_t opcode)
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{
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/*
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@ -1037,7 +1045,7 @@ static void decode_opc(CPURISCVState *env, DisasContext *ctx, uint16_t opcode)
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};
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/* Check for compressed insn */
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if (extract16(opcode, 0, 2) != 3) {
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if (insn_len(opcode) == 2) {
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if (!has_ext(ctx, RVC)) {
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gen_exception_illegal(ctx);
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} else {
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