Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit fb4616f4 authored by Mohammed Gamal's avatar Mohammed Gamal Committed by Avi Kivity
Browse files

KVM: x86 emulator: Add std and cld instructions (opcodes 0xfc-0xfd) 



This adds the std and cld instructions to the emulator.

Encountered while running the BIOS with invalid guest
state emulation enabled.

Signed-off-by: default avatarMohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent 20766c08

arch/x86/kvm/x86_emulate.c

+9 −1
Original line number Diff line number Diff line
@@ -187,7 +187,7 @@ static u16 opcode_table[256] = { 
	ImplicitOps, ImplicitOps, Group | Group3_Byte, Group | Group3,

	/* 0xF8 - 0xFF */

	ImplicitOps, 0, ImplicitOps, ImplicitOps,

	0, 0, Group | Group4, Group | Group5,

	ImplicitOps, ImplicitOps, Group | Group4, Group | Group5,

};



static u16 twobyte_table[256] = {
@@ -1762,6 +1762,14 @@ x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) 
		ctxt->eflags |= X86_EFLAGS_IF;

		c->dst.type = OP_NONE;	/* Disable writeback. */

		break;

	case 0xfc: /* cld */

		ctxt->eflags &= ~EFLG_DF;

		c->dst.type = OP_NONE;	/* Disable writeback. */

		break;

	case 0xfd: /* std */

		ctxt->eflags |= EFLG_DF;

		c->dst.type = OP_NONE;	/* Disable writeback. */

		break;

	case 0xfe ... 0xff:	/* Grp4/Grp5 */

		rc = emulate_grp45(ctxt, ops);

		if (rc != 0)