# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1196013956 0
# Node ID 502f5b9469c35ed1f93ebf7ac6b5f6efb2698fc7
# Parent f6a587e3d5c981b7cea8c3e97d234e14e3ca81bb
x86_emulate: Decode and emulate PUSHF/POPF.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
xen/arch/x86/x86_emulate.c | 54 +++++++++++++++++++++++++++++++++++----------
1 files changed, 42 insertions(+), 12 deletions(-)
diff -r f6a587e3d5c9 -r 502f5b9469c3 xen/arch/x86/x86_emulate.c
--- a/xen/arch/x86/x86_emulate.c Sun Nov 25 18:05:10 2007 +0000
+++ b/xen/arch/x86/x86_emulate.c Sun Nov 25 18:05:56 2007 +0000
@@ -127,7 +127,7 @@ static uint8_t opcode_table[256] = {
ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
/* 0x98 - 0x9F */
ImplicitOps, ImplicitOps, ImplicitOps, 0,
- 0, 0, ImplicitOps, ImplicitOps,
+ ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
/* 0xA0 - 0xA7 */
ByteOp|ImplicitOps|Mov, ImplicitOps|Mov,
ByteOp|ImplicitOps|Mov, ImplicitOps|Mov,
@@ -265,17 +265,22 @@ struct operand {
};
/* EFLAGS bit definitions. */
-#define EFLG_VM (1<<17)
-#define EFLG_RF (1<<16)
-#define EFLG_OF (1<<11)
-#define EFLG_DF (1<<10)
-#define EFLG_IF (1<<9)
-#define EFLG_TF (1<<8)
-#define EFLG_SF (1<<7)
-#define EFLG_ZF (1<<6)
-#define EFLG_AF (1<<4)
-#define EFLG_PF (1<<2)
-#define EFLG_CF (1<<0)
+#define EFLG_VIP (1<<20)
+#define EFLG_VIF (1<<19)
+#define EFLG_AC (1<<18)
+#define EFLG_VM (1<<17)
+#define EFLG_RF (1<<16)
+#define EFLG_NT (1<<14)
+#define EFLG_IOPL (3<<12)
+#define EFLG_OF (1<<11)
+#define EFLG_DF (1<<10)
+#define EFLG_IF (1<<9)
+#define EFLG_TF (1<<8)
+#define EFLG_SF (1<<7)
+#define EFLG_ZF (1<<6)
+#define EFLG_AF (1<<4)
+#define EFLG_PF (1<<2)
+#define EFLG_CF (1<<0)
/* Exception definitions. */
#define EXC_DE 0
@@ -2089,6 +2094,31 @@ x86_emulate(
break;
}
+ case 0x9c: /* pushf */
+ src.val = _regs.eflags;
+ goto push;
+
+ case 0x9d: /* popf */ {
+ uint32_t mask = EFLG_VIP | EFLG_VIF | EFLG_VM;
+ if ( !mode_iopl() )
+ mask |= EFLG_IOPL;
+ fail_if(ops->write_rflags == NULL);
+ /* 64-bit mode: POP defaults to a 64-bit operand. */
+ if ( mode_64bit() && (op_bytes == 4) )
+ op_bytes = 8;
+ if ( (rc = ops->read(x86_seg_ss, sp_post_inc(op_bytes),
+ &dst.val, op_bytes, ctxt)) != 0 )
+ goto done;
+ if ( op_bytes == 2 )
+ dst.val = (uint16_t)dst.val | (_regs.eflags & 0xffff0000u);
+ dst.val &= 0x257fd5;
+ _regs.eflags &= mask;
+ _regs.eflags |= (uint32_t)(dst.val & ~mask) | 0x02;
+ if ( (rc = ops->write_rflags(_regs.eflags, ctxt)) != 0 )
+ goto done;
+ break;
+ }
+
case 0x9e: /* sahf */
*(uint8_t *)_regs.eflags = (((uint8_t *)&_regs.eax)[1] & 0xd7) | 0x02;
break;
_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog
|
Home