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parseinstrs: Add support for BCST16

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2-byte broadcasts cannot be inferred from the encoding and need to be
indicated in the descriptor.
This commit is contained in:
Alexis Engelke
2022-12-26 17:10:39 +01:00
parent 06832825ec
commit 8550e2cac9
2 changed files with 35 additions and 26 deletions
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6
decode.c
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@@ -94,6 +94,7 @@ struct InstrDesc
#define DESC_IGN66(desc) (((desc)->reg_types >> 15) & 1)
#define DESC_EVEX_SAE(desc) (((desc)->reg_types >> 8) & 1)
#define DESC_EVEX_ER(desc) (((desc)->reg_types >> 9) & 1)
#define DESC_EVEX_BCST16(desc) (((desc)->reg_types >> 10) & 1)
#define DESC_REGTY_MODRM(desc) (((desc)->reg_types >> 0) & 7)
#define DESC_REGTY_MODREG(desc) (((desc)->reg_types >> 3) & 7)
#define DESC_REGTY_VEXREG(desc) (((desc)->reg_types >> 6) & 3)
@@ -495,7 +496,10 @@ prefix_end:
if (UNLIKELY(prefix_evex & 0x10)) {
if (UNLIKELY(!DESC_EVEX_BCST(desc)))
return FD_ERR_UD;
scale = prefix_rex & PREFIX_REXW ? 3 : 2;
if (UNLIKELY(DESC_EVEX_BCST16(desc)))
scale = 1;
else
scale = prefix_rex & PREFIX_REXW ? 3 : 2;
instr->segment |= scale << 6; // Store broadcast size
op_modrm->type = FD_OT_MEMBCST;
} else {