Il 10/04/2014 20:03, Bandan Das ha scritto:
- if (ctxt->rex_prefix) {
- ctxt->modrm_reg = (ctxt->rex_prefix & 4) << 1; /* REX.R */
- index_reg = (ctxt->rex_prefix & 2) << 2; /* REX.X */
- ctxt->modrm_rm = base_reg = (ctxt->rex_prefix & 1) << 3; /*
REG.B */
- }
+ index_reg = (ctxt->rex_prefix << 2) & 8; /* REX.X */
+ base_reg = (ctxt->rex_prefix << 3) & 8; /* REG.B */
This is REX.B (preexisting typo), and please leave REX.R here too for
clarity.
Also, the function is "decode_modrm", not "decode_rm" (in the commit
message).
Otherwise the series seems okay from a somewhat cursory review.
Paolo
- ctxt->modrm_mod |= (ctxt->modrm & 0xc0) >> 6;
- ctxt->modrm_reg |= (ctxt->modrm & 0x38) >> 3;
- ctxt->modrm_rm |= (ctxt->modrm & 0x07);
+ ctxt->modrm_mod = (ctxt->modrm & 0xc0) >> 6;
+ ctxt->modrm_reg = ((ctxt->rex_prefix << 1) & 8) | /* REX.R */
+ ((ctxt->modrm & 0x38) >> 3);
+ ctxt->modrm_rm = base_reg | (ctxt->modrm & 0x07);
ctxt->modrm_seg = VCPU_SREG_DS;
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