KVM: x86 emulator: X86EMUL macro replacements: x86_emulate_insn() and its helpers
This patch just replaces integer values used inside
x86_emulate_insn() and its helper functions to X86EMUL_*.
The purpose of this is to make it clear what will happen
when the variable rc is compared to X86EMUL_* at the end
of x86_emulate_insn().
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index b8aed35..ee1a2a2 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -702,7 +702,7 @@
*address = 0;
rc = ops->read_std((unsigned long)ptr, (unsigned long *)size, 2,
ctxt->vcpu, NULL);
- if (rc)
+ if (rc != X86EMUL_CONTINUE)
return rc;
rc = ops->read_std((unsigned long)ptr + 2, address, op_bytes,
ctxt->vcpu, NULL);
@@ -1301,7 +1301,7 @@
int rc;
rc = emulate_pop(ctxt, ops, &selector, c->op_bytes);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
return rc;
rc = kvm_load_segment_descriptor(ctxt->vcpu, (u16)selector, seg);
@@ -1327,7 +1327,7 @@
struct x86_emulate_ops *ops)
{
struct decode_cache *c = &ctxt->decode;
- int rc = 0;
+ int rc = X86EMUL_CONTINUE;
int reg = VCPU_REGS_RDI;
while (reg >= VCPU_REGS_RAX) {
@@ -1338,7 +1338,7 @@
}
rc = emulate_pop(ctxt, ops, &c->regs[reg], c->op_bytes);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
break;
--reg;
}
@@ -1349,12 +1349,8 @@
struct x86_emulate_ops *ops)
{
struct decode_cache *c = &ctxt->decode;
- int rc;
- rc = emulate_pop(ctxt, ops, &c->dst.val, c->dst.bytes);
- if (rc != 0)
- return rc;
- return 0;
+ return emulate_pop(ctxt, ops, &c->dst.val, c->dst.bytes);
}
static inline void emulate_grp2(struct x86_emulate_ctxt *ctxt)
@@ -1390,7 +1386,7 @@
struct x86_emulate_ops *ops)
{
struct decode_cache *c = &ctxt->decode;
- int rc = 0;
+ int rc = X86EMUL_CONTINUE;
switch (c->modrm_reg) {
case 0 ... 1: /* test */
@@ -1437,7 +1433,7 @@
emulate_push(ctxt);
break;
}
- return 0;
+ return X86EMUL_CONTINUE;
}
static inline int emulate_grp9(struct x86_emulate_ctxt *ctxt,
@@ -1468,7 +1464,7 @@
return rc;
ctxt->eflags |= EFLG_ZF;
}
- return 0;
+ return X86EMUL_CONTINUE;
}
static int emulate_ret_far(struct x86_emulate_ctxt *ctxt,
@@ -1479,12 +1475,12 @@
unsigned long cs;
rc = emulate_pop(ctxt, ops, &c->eip, c->op_bytes);
- if (rc)
+ if (rc != X86EMUL_CONTINUE)
return rc;
if (c->op_bytes == 4)
c->eip = (u32)c->eip;
rc = emulate_pop(ctxt, ops, &cs, c->op_bytes);
- if (rc)
+ if (rc != X86EMUL_CONTINUE)
return rc;
rc = kvm_load_segment_descriptor(ctxt->vcpu, (u16)cs, VCPU_SREG_CS);
return rc;
@@ -1539,7 +1535,7 @@
default:
break;
}
- return 0;
+ return X86EMUL_CONTINUE;
}
static void toggle_interruptibility(struct x86_emulate_ctxt *ctxt, u32 mask)
@@ -1811,7 +1807,7 @@
struct decode_cache *c = &ctxt->decode;
unsigned int port;
int io_dir_in;
- int rc = 0;
+ int rc = X86EMUL_CONTINUE;
ctxt->interruptibility = 0;
@@ -1926,7 +1922,7 @@
break;
case 0x07: /* pop es */
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_ES);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0x08 ... 0x0d:
@@ -1945,7 +1941,7 @@
break;
case 0x17: /* pop ss */
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_SS);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0x18 ... 0x1d:
@@ -1957,7 +1953,7 @@
break;
case 0x1f: /* pop ds */
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_DS);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0x20 ... 0x25:
@@ -1988,7 +1984,7 @@
case 0x58 ... 0x5f: /* pop reg */
pop_instruction:
rc = emulate_pop(ctxt, ops, &c->dst.val, c->op_bytes);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0x60: /* pusha */
@@ -1996,7 +1992,7 @@
break;
case 0x61: /* popa */
rc = emulate_popa(ctxt, ops);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0x63: /* movsxd */
@@ -2141,7 +2137,7 @@
}
case 0x8f: /* pop (sole member of Grp1a) */
rc = emulate_grp1a(ctxt, ops);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0x90: /* nop / xchg r8,rax */
@@ -2277,7 +2273,7 @@
break;
case 0xcb: /* ret far */
rc = emulate_ret_far(ctxt, ops);
- if (rc)
+ if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0xd0 ... 0xd1: /* Grp2 */
@@ -2351,7 +2347,7 @@
break;
case 0xf6 ... 0xf7: /* Grp3 */
rc = emulate_grp3(ctxt, ops);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0xf8: /* clc */
@@ -2385,14 +2381,14 @@
break;
case 0xfe ... 0xff: /* Grp4/Grp5 */
rc = emulate_grp45(ctxt, ops);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
goto done;
break;
}
writeback:
rc = writeback(ctxt, ops);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
goto done;
/* Commit shadow register state. */
@@ -2418,7 +2414,7 @@
goto cannot_emulate;
rc = kvm_fix_hypercall(ctxt->vcpu);
- if (rc)
+ if (rc != X86EMUL_CONTINUE)
goto done;
/* Let the processor re-execute the fixed hypercall */
@@ -2429,7 +2425,7 @@
case 2: /* lgdt */
rc = read_descriptor(ctxt, ops, c->src.ptr,
&size, &address, c->op_bytes);
- if (rc)
+ if (rc != X86EMUL_CONTINUE)
goto done;
realmode_lgdt(ctxt->vcpu, size, address);
/* Disable writeback. */
@@ -2440,7 +2436,7 @@
switch (c->modrm_rm) {
case 1:
rc = kvm_fix_hypercall(ctxt->vcpu);
- if (rc)
+ if (rc != X86EMUL_CONTINUE)
goto done;
break;
default:
@@ -2450,7 +2446,7 @@
rc = read_descriptor(ctxt, ops, c->src.ptr,
&size, &address,
c->op_bytes);
- if (rc)
+ if (rc != X86EMUL_CONTINUE)
goto done;
realmode_lidt(ctxt->vcpu, size, address);
}
@@ -2577,7 +2573,7 @@
break;
case 0xa1: /* pop fs */
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_FS);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0xa3:
@@ -2596,7 +2592,7 @@
break;
case 0xa9: /* pop gs */
rc = emulate_pop_sreg(ctxt, ops, VCPU_SREG_GS);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
goto done;
break;
case 0xab:
@@ -2669,7 +2665,7 @@
break;
case 0xc7: /* Grp9 (cmpxchg8b) */
rc = emulate_grp9(ctxt, ops, memop);
- if (rc != 0)
+ if (rc != X86EMUL_CONTINUE)
goto done;
c->dst.type = OP_NONE;
break;