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HV: Remove SIB decode related code in decode_modrm

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We will decode SIB in decode_sib after decode_modrm. So, there is no need to
decode SIB related field in decode_modrm. This patch remove it.

Signed-off-by: Kaige Fu <kaige.fu@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
This commit is contained in:
Kaige Fu 2018-07-12 13:28:28 +08:00 committed by lijinxia
parent 0fbdf374a3
commit 2f3eb6723d
1 changed files with 0 additions and 35 deletions
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35
hypervisor/arch/x86/guest/instr_emul.c
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@ -1969,41 +1969,6 @@ decode_modrm(struct vie *vie, enum vm_cpu_mode cpu_mode)
vie->reg |= (vie->rex_r << 3);
/* SIB */
if (vie->mod != VIE_MOD_DIRECT && vie->rm == VIE_RM_SIB) {
goto done;
}
vie->base_register = gpr_map[vie->rm];
switch (vie->mod) {
case VIE_MOD_INDIRECT_DISP8:
vie->disp_bytes = 1U;
break;
case VIE_MOD_INDIRECT_DISP32:
vie->disp_bytes = 4U;
break;
case VIE_MOD_INDIRECT:
if (vie->rm == VIE_RM_DISP32) {
vie->disp_bytes = 4U;
/*
* Table 2-7. RIP-Relative Addressing
*
* In 64-bit mode mod=00 r/m=101 implies [rip] + disp32
* whereas in compatibility mode it just implies disp32.
*/
if (cpu_mode == CPU_MODE_64BIT) {
vie->base_register = CPU_REG_RIP;
}
else {
vie->base_register = CPU_REG_LAST;
}
}
break;
}
done:
vie_advance(vie);
return 0;