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KVM: x86 emulator: Add 'push/pop sreg' instructions 

[avi: avoid buffer overflow]

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Mohammed Gamal 2009-08-23 14:24:24 +03:00 committed by Avi Kivity
parent 45ec431c52
commit 0934ac9d13
1 changed files with 101 additions and 6 deletions
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107
arch/x86/kvm/emulate.c
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@ -92,19 +92,22 @@ static u32 opcode_table[256] = {
/* 0x00 - 0x07 */
ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
ByteOp | DstAcc | SrcImm, DstAcc | SrcImm, 0, 0,
ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
ImplicitOps | Stack, ImplicitOps | Stack,
/* 0x08 - 0x0F */
ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
0, 0, 0, 0,
0, 0, ImplicitOps | Stack, 0,
/* 0x10 - 0x17 */
ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
ByteOp | DstAcc | SrcImm, DstAcc | SrcImm, 0, 0,
ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
ImplicitOps | Stack, ImplicitOps | Stack,
/* 0x18 - 0x1F */
ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
ByteOp | DstAcc | SrcImm, DstAcc | SrcImm, 0, 0,
ByteOp | DstAcc | SrcImm, DstAcc | SrcImm,
ImplicitOps | Stack, ImplicitOps | Stack,
/* 0x20 - 0x27 */
ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM,
ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM,
@ -244,11 +247,13 @@ static u32 twobyte_table[256] = {
/* 0x90 - 0x9F */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 0xA0 - 0xA7 */
0, 0, 0, DstMem | SrcReg | ModRM | BitOp,
ImplicitOps | Stack, ImplicitOps | Stack,
0, DstMem | SrcReg | ModRM | BitOp,
DstMem | SrcReg | Src2ImmByte | ModRM,
DstMem | SrcReg | Src2CL | ModRM, 0, 0,
/* 0xA8 - 0xAF */
0, 0, 0, DstMem | SrcReg | ModRM | BitOp,
ImplicitOps | Stack, ImplicitOps | Stack,
0, DstMem | SrcReg | ModRM | BitOp,
DstMem | SrcReg | Src2ImmByte | ModRM,
DstMem | SrcReg | Src2CL | ModRM,
ModRM, 0,
@ -1186,6 +1191,32 @@ static int emulate_pop(struct x86_emulate_ctxt *ctxt,
return rc;
}
static void emulate_push_sreg(struct x86_emulate_ctxt *ctxt, int seg)
{
struct decode_cache *c = &ctxt->decode;
struct kvm_segment segment;
kvm_x86_ops->get_segment(ctxt->vcpu, &segment, seg);
c->src.val = segment.selector;
emulate_push(ctxt);
}
static int emulate_pop_sreg(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops, int seg)
{
struct decode_cache *c = &ctxt->decode;
unsigned long selector;
int rc;
rc = emulate_pop(ctxt, ops, &selector, c->op_bytes);
if (rc != 0)
return rc;
rc = kvm_load_segment_descriptor(ctxt->vcpu, (u16)selector, 1, seg);
return rc;
}
static inline int emulate_grp1a(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops)
{
@ -1707,18 +1738,66 @@ special_insn:
add: /* add */
emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags);
break;
case 0x06: /* push es */
if (ctxt->mode == X86EMUL_MODE_PROT64)
goto cannot_emulate;
emulate_push_sreg(ctxt, VCPU_SREG_ES);
break;
case 0x07: /* pop es */
if (ctxt->mode == X86EMUL_MODE_PROT64)
goto cannot_emulate;
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_ES);
if (rc != 0)
goto done;
break;
case 0x08 ... 0x0d:
or: /* or */
emulate_2op_SrcV("or", c->src, c->dst, ctxt->eflags);
break;
case 0x0e: /* push cs */
if (ctxt->mode == X86EMUL_MODE_PROT64)
goto cannot_emulate;
emulate_push_sreg(ctxt, VCPU_SREG_CS);
break;
case 0x10 ... 0x15:
adc: /* adc */
emulate_2op_SrcV("adc", c->src, c->dst, ctxt->eflags);
break;
case 0x16: /* push ss */
if (ctxt->mode == X86EMUL_MODE_PROT64)
goto cannot_emulate;
emulate_push_sreg(ctxt, VCPU_SREG_SS);
break;
case 0x17: /* pop ss */
if (ctxt->mode == X86EMUL_MODE_PROT64)
goto cannot_emulate;
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_SS);
if (rc != 0)
goto done;
break;
case 0x18 ... 0x1d:
sbb: /* sbb */
emulate_2op_SrcV("sbb", c->src, c->dst, ctxt->eflags);
break;
case 0x1e: /* push ds */
if (ctxt->mode == X86EMUL_MODE_PROT64)
goto cannot_emulate;
emulate_push_sreg(ctxt, VCPU_SREG_DS);
break;
case 0x1f: /* pop ds */
if (ctxt->mode == X86EMUL_MODE_PROT64)
goto cannot_emulate;
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_DS);
if (rc != 0)
goto done;
break;
case 0x20 ... 0x25:
and: /* and */
emulate_2op_SrcV("and", c->src, c->dst, ctxt->eflags);
@ -2297,6 +2376,14 @@ twobyte_insn:
jmp_rel(c, c->src.val);
c->dst.type = OP_NONE;
break;
case 0xa0: /* push fs */
emulate_push_sreg(ctxt, VCPU_SREG_FS);
break;
case 0xa1: /* pop fs */
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_FS);
if (rc != 0)
goto done;
break;
case 0xa3:
bt: /* bt */
c->dst.type = OP_NONE;
@ -2308,6 +2395,14 @@ twobyte_insn:
case 0xa5: /* shld cl, r, r/m */
emulate_2op_cl("shld", c->src2, c->src, c->dst, ctxt->eflags);
break;
case 0xa8: /* push gs */
emulate_push_sreg(ctxt, VCPU_SREG_GS);
break;
case 0xa9: /* pop gs */
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_GS);
if (rc != 0)
goto done;
break;
case 0xab:
bts: /* bts */
/* only subword offset */