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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RESEND 1/4] x86emul: support MOVBE and CRC32
The former in an attempt to at least gradually support all simple data
movement instructions. The latter just because it shares the opcode
with the former.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/tools/tests/x86_emulator/test_x86_emulator.c
+++ b/tools/tests/x86_emulator/test_x86_emulator.c
@@ -78,7 +78,14 @@ static int cpuid(
unsigned int *edx,
struct x86_emulate_ctxt *ctxt)
{
+ unsigned int leaf = *eax;
+
asm ("cpuid" : "+a" (*eax), "+c" (*ecx), "=d" (*edx), "=b" (*ebx));
+
+ /* The emulator doesn't itself use MOVBE, so we can always run the test. */
+ if ( leaf == 1 )
+ *ecx |= 1U << 22;
+
return X86EMUL_OKAY;
}
@@ -605,6 +612,34 @@ int main(int argc, char **argv)
printf("skipped\n");
#endif
+ printf("%-40s", "Testing movbe (%%ecx),%%eax...");
+ instr[0] = 0x0f; instr[1] = 0x38; instr[2] = 0xf0; instr[3] = 0x01;
+ regs.eflags = 0x200;
+ regs.eip = (unsigned long)&instr[0];
+ regs.ecx = (unsigned long)res;
+ regs.eax = 0x11111111;
+ *res = 0x12345678;
+ rc = x86_emulate(&ctxt, &emulops);
+ if ( (rc != X86EMUL_OKAY) ||
+ (*res != 0x12345678) ||
+ (regs.eax != 0x78563412) ||
+ (regs.eflags != 0x200) ||
+ (regs.eip != (unsigned long)&instr[4]) )
+ goto fail;
+ printf("okay\n");
+
+ printf("%-40s", "Testing movbe %%ax,(%%ecx)...");
+ instr[0] = 0x66; instr[1] = 0x0f; instr[2] = 0x38; instr[3] = 0xf1;
instr[4] = 0x01;
+ regs.eip = (unsigned long)&instr[0];
+ rc = x86_emulate(&ctxt, &emulops);
+ if ( (rc != X86EMUL_OKAY) ||
+ (*res != 0x12341234) ||
+ (regs.eax != 0x78563412) ||
+ (regs.eflags != 0x200) ||
+ (regs.eip != (unsigned long)&instr[5]) )
+ goto fail;
+ printf("okay\n");
+
#define decl_insn(which) extern const unsigned char which[], which##_len[]
#define put_insn(which, insn) ".pushsection .test, \"ax\", @progbits\n" \
#which ": " insn "\n" \
--- a/tools/tests/x86_emulator/x86_emulate.c
+++ b/tools/tests/x86_emulator/x86_emulate.c
@@ -12,6 +12,7 @@ typedef bool bool_t;
#define BUG() abort()
#define ASSERT assert
+#define ASSERT_UNREACHABLE() assert(!__LINE__)
#define cpu_has_amd_erratum(nr) 0
#define mark_regs_dirty(r) ((void)(r))
--- a/xen/arch/x86/Rules.mk
+++ b/xen/arch/x86/Rules.mk
@@ -12,6 +12,7 @@ CFLAGS += -msoft-float
$(call cc-options-add,CFLAGS,CC,$(EMBEDDED_EXTRA_CFLAGS))
$(call cc-option-add,CFLAGS,CC,-Wnested-externs)
$(call as-insn-check,CFLAGS,CC,"vmcall",-DHAVE_GAS_VMX)
+$(call as-insn-check,CFLAGS,CC,"crc32 %eax$$(comma)%eax",-DHAVE_GAS_SSE4_2)
$(call as-insn-check,CFLAGS,CC,"invept (%rax)$$(comma)%rax",-DHAVE_GAS_EPT)
$(call as-insn-check,CFLAGS,CC,"rdfsbase %rax",-DHAVE_GAS_FSGSBASE)
$(call as-insn-check,CFLAGS,CC,".equ \"x\"$$(comma)1", \
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -188,7 +188,7 @@ static uint8_t twobyte_table[256] = {
ImplicitOps, ImplicitOps, ImplicitOps, 0,
ImplicitOps, ImplicitOps, 0, 0,
/* 0x38 - 0x3F */
- 0, 0, 0, 0, 0, 0, 0, 0,
+ DstReg|SrcMem|ModRM, 0, 0, 0, 0, 0, 0, 0,
/* 0x40 - 0x47 */
DstReg|SrcMem|ModRM|Mov, DstReg|SrcMem|ModRM|Mov,
DstReg|SrcMem|ModRM|Mov, DstReg|SrcMem|ModRM|Mov,
@@ -1098,6 +1098,8 @@ static bool_t vcpu_has(
#define vcpu_must_have_sse2() vcpu_must_have(0x00000001, EDX, 26)
#define vcpu_must_have_sse3() vcpu_must_have(0x00000001, ECX, 0)
#define vcpu_must_have_cx16() vcpu_must_have(0x00000001, ECX, 13)
+#define vcpu_must_have_sse4_2() vcpu_must_have(0x00000001, ECX, 20)
+#define vcpu_must_have_movbe() vcpu_must_have(0x00000001, ECX, 22)
#define vcpu_must_have_avx() vcpu_must_have(0x00000001, ECX, 28)
#ifdef __XEN__
@@ -1509,8 +1511,9 @@ x86_emulate(
/* Shadow copy of register state. Committed on successful emulation. */
struct cpu_user_regs _regs = *ctxt->regs;
- uint8_t b, d, sib, sib_index, sib_base, twobyte = 0, rex_prefix = 0;
+ uint8_t b, d, sib, sib_index, sib_base, rex_prefix = 0;
uint8_t modrm = 0, modrm_mod = 0, modrm_reg = 0, modrm_rm = 0;
+ enum { ext_none, ext_0f, ext_0f38 } ext = ext_none;
union vex vex = {};
unsigned int op_bytes, def_op_bytes, ad_bytes, def_ad_bytes;
bool_t lock_prefix = 0;
@@ -1606,9 +1609,18 @@ x86_emulate(
/* Two-byte opcode? */
if ( b == 0x0f )
{
- twobyte = 1;
b = insn_fetch_type(uint8_t);
d = twobyte_table[b];
+ switch ( b )
+ {
+ default:
+ ext = ext_0f;
+ break;
+ case 0x38:
+ b = insn_fetch_type(uint8_t);
+ ext = ext_0f38;
+ break;
+ }
}
/* Unrecognised? */
@@ -1625,7 +1637,7 @@ x86_emulate(
modrm = insn_fetch_type(uint8_t);
modrm_mod = (modrm & 0xc0) >> 6;
- if ( !twobyte && ((b & ~1) == 0xc4) )
+ if ( !ext && ((b & ~1) == 0xc4) )
switch ( def_ad_bytes )
{
default:
@@ -1671,12 +1683,12 @@ x86_emulate(
rex_prefix |= REX_R;
fail_if(vex.opcx != vex_0f);
- twobyte = 1;
+ ext = ext_0f;
b = insn_fetch_type(uint8_t);
d = twobyte_table[b];
/* Unrecognised? */
- if ( d == 0 )
+ if ( d == 0 || b == 0x38 )
goto cannot_emulate;
modrm = insn_fetch_type(uint8_t);
@@ -1762,7 +1774,7 @@ x86_emulate(
{
ea.mem.seg = x86_seg_ss;
ea.mem.off += _regs.esp;
- if ( !twobyte && (b == 0x8f) )
+ if ( !ext && (b == 0x8f) )
/* POP <rm> computes its EA post increment. */
ea.mem.off += ((mode_64bit() && (op_bytes == 4))
? 8 : op_bytes);
@@ -1797,12 +1809,12 @@ x86_emulate(
((op_bytes == 8) ? 4 : op_bytes);
else if ( (d & SrcMask) == SrcImmByte )
ea.mem.off += 1;
- else if ( !twobyte && ((b & 0xfe) == 0xf6) &&
+ else if ( !ext && ((b & 0xfe) == 0xf6) &&
((modrm_reg & 7) <= 1) )
/* Special case in Grp3: test has immediate operand. */
ea.mem.off += (d & ByteOp) ? 1
: ((op_bytes == 8) ? 4 : op_bytes);
- else if ( twobyte && ((b & 0xf7) == 0xa4) )
+ else if ( ext == ext_0f && ((b & 0xf7) == 0xa4) )
/* SHLD/SHRD with immediate byte third operand. */
ea.mem.off++;
break;
@@ -1821,7 +1833,9 @@ x86_emulate(
ea.mem.seg = override_seg;
/* Early operand adjustments. */
- if ( !twobyte )
+ switch ( ext )
+ {
+ case ext_none:
switch ( b )
{
case 0xf6 ... 0xf7: /* Grp3 */
@@ -1854,6 +1868,29 @@ x86_emulate(
}
break;
}
+ break;
+
+ case ext_0f:
+ break;
+
+ case ext_0f38:
+ switch ( b )
+ {
+ case 0xf0: /* movbe / crc32 */
+ d |= repne_prefix() ? ByteOp : Mov;
+ break;
+ case 0xf1: /* movbe / crc32 */
+ if ( !repne_prefix() )
+ d = (d & ~(DstMask | SrcMask)) | DstMem | SrcReg | Mov;
+ break;
+ default: /* Until it is worth making this table based ... */
+ goto cannot_emulate;
+ }
+ break;
+
+ default:
+ ASSERT_UNREACHABLE();
+ }
/* Decode and fetch the source operand: register, memory or immediate. */
switch ( d & SrcMask )
@@ -2012,8 +2049,18 @@ x86_emulate(
break;
}
- if ( twobyte )
- goto twobyte_insn;
+ switch ( ext )
+ {
+ case ext_none:
+ break;
+ case ext_0f:
+ goto ext_0f_insn;
+ case ext_0f38:
+ goto ext_0f38_insn;
+ default:
+ ASSERT_UNREACHABLE();
+ goto cannot_emulate;
+ }
switch ( b )
{
@@ -2056,7 +2103,7 @@ x86_emulate(
struct segment_register reg;
src.val = x86_seg_es;
push_seg:
- generate_exception_if(mode_64bit() && !twobyte, EXC_UD, -1);
+ generate_exception_if(mode_64bit() && !ext, EXC_UD, -1);
fail_if(ops->read_segment == NULL);
if ( (rc = ops->read_segment(src.val, ®, ctxt)) != 0 )
return rc;
@@ -2072,7 +2119,7 @@ x86_emulate(
case 0x07: /* pop %%es */
src.val = x86_seg_es;
pop_seg:
- generate_exception_if(mode_64bit() && !twobyte, EXC_UD, -1);
+ generate_exception_if(mode_64bit() && !ext, EXC_UD, -1);
fail_if(ops->write_segment == NULL);
/* 64-bit mode: POP defaults to a 64-bit operand. */
if ( mode_64bit() && (op_bytes == 4) )
@@ -2727,7 +2774,7 @@ x86_emulate(
unsigned long sel;
dst.val = x86_seg_es;
les: /* dst.val identifies the segment */
- generate_exception_if(mode_64bit() && !twobyte, EXC_UD, -1);
+ generate_exception_if(mode_64bit() && !ext, EXC_UD, -1);
generate_exception_if(src.type != OP_MEM, EXC_UD, -1);
if ( (rc = read_ulong(src.mem.seg, src.mem.off + src.bytes,
&sel, 2, ctxt, ops)) != 0 )
@@ -3865,7 +3912,7 @@ x86_emulate(
put_stub(stub);
return rc;
- twobyte_insn:
+ ext_0f_insn:
switch ( b )
{
case 0x00: /* Grp6 */
@@ -4772,6 +4819,72 @@ x86_emulate(
}
goto writeback;
+ ext_0f38_insn:
+ switch ( b )
+ {
+ case 0xf0: case 0xf1: /* movbe / crc32 */
+ generate_exception_if(repe_prefix(), EXC_UD, -1);
+ if ( repne_prefix() )
+ {
+ /* crc32 */
+#ifdef HAVE_GAS_SSE4_2
+ host_and_vcpu_must_have(sse4_2);
+ dst.bytes = rex_prefix & REX_W ? 8 : 4;
+ switch ( op_bytes )
+ {
+ case 1:
+ asm ( "crc32b %1,%k0" : "+r" (dst.val)
+ : "qm" (*(uint8_t *)&src.val) );
+ break;
+ case 2:
+ asm ( "crc32w %1,%k0" : "+r" (dst.val)
+ : "rm" (*(uint16_t *)&src.val) );
+ break;
+ case 4:
+ asm ( "crc32l %1,%k0" : "+r" (dst.val)
+ : "rm" (*(uint32_t *)&src.val) );
+ break;
+# ifdef __x86_64__
+ case 8:
+ asm ( "crc32q %1,%0" : "+r" (dst.val) : "rm" (src.val) );
+ break;
+# endif
+ default:
+ ASSERT_UNREACHABLE();
+ }
+#else /* !HAVE_GAS_SSE4_2 */
+ goto cannot_emulate;
+#endif
+ }
+ else
+ {
+ /* movbe */
+ vcpu_must_have_movbe();
+ switch ( op_bytes )
+ {
+ case 2:
+ asm ( "xchg %h0,%b0" : "=Q" (dst.val)
+ : "0" (*(uint32_t *)&src.val) );
+ break;
+ case 4:
+#ifdef __x86_64__
+ asm ( "bswap %k0" : "=r" (dst.val)
+ : "0" (*(uint32_t *)&src.val) );
+ break;
+ case 8:
+#endif
+ asm ( "bswap %0" : "=r" (dst.val) : "0" (src.val) );
+ break;
+ default:
+ ASSERT_UNREACHABLE();
+ }
+ }
+ break;
+ default:
+ goto cannot_emulate;
+ }
+ goto writeback;
+
cannot_emulate:
_put_fpu();
put_stub(stub);
--- a/xen/include/asm-x86/cpufeature.h
+++ b/xen/include/asm-x86/cpufeature.h
@@ -57,6 +57,7 @@
#define cpu_has_sse boot_cpu_has(X86_FEATURE_SSE)
#define cpu_has_sse2 boot_cpu_has(X86_FEATURE_SSE2)
#define cpu_has_sse3 boot_cpu_has(X86_FEATURE_SSE3)
+#define cpu_has_sse4_2 boot_cpu_has(X86_FEATURE_SSE4_2)
#define cpu_has_htt boot_cpu_has(X86_FEATURE_HTT)
#define cpu_has_nx boot_cpu_has(X86_FEATURE_NX)
#define cpu_has_clflush boot_cpu_has(X86_FEATURE_CLFLUSH)
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