# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1196253859 0
# Node ID cca2f2fb857d5dce7c435e92b8fc105d388f4f5d
# Parent 3fdbdd131fc7c64cacf99e2dd9eda40ca3ed40bb
x86_emulate: Emulate ENTER and LEAVE instructions.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
xen/arch/x86/x86_emulate.c | 59 ++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 58 insertions(+), 1 deletion(-)
diff -r 3fdbdd131fc7 -r cca2f2fb857d xen/arch/x86/x86_emulate.c
--- a/xen/arch/x86/x86_emulate.c Wed Nov 28 12:42:17 2007 +0000
+++ b/xen/arch/x86/x86_emulate.c Wed Nov 28 12:44:19 2007 +0000
@@ -152,7 +152,7 @@ static uint8_t opcode_table[256] = {
DstReg|SrcMem|ModRM|Mov, DstReg|SrcMem|ModRM|Mov,
ByteOp|DstMem|SrcImm|ModRM|Mov, DstMem|SrcImm|ModRM|Mov,
/* 0xC8 - 0xCF */
- 0, 0, ImplicitOps, ImplicitOps,
+ ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps,
/* 0xD0 - 0xD7 */
ByteOp|DstMem|SrcImplicit|ModRM, DstMem|SrcImplicit|ModRM,
@@ -2263,6 +2263,63 @@ x86_emulate(
break;
}
+ case 0xc8: /* enter imm16,imm8 */ {
+ uint16_t size = insn_fetch_type(uint16_t);
+ uint8_t depth = insn_fetch_type(uint8_t) & 31;
+ int i;
+
+ dst.type = OP_REG;
+ dst.bytes = (mode_64bit() && (op_bytes == 4)) ? 8 : op_bytes;
+ dst.reg = (unsigned long *)&_regs.ebp;
+ if ( (rc = ops->write(x86_seg_ss, sp_pre_dec(dst.bytes),
+ _regs.ebp, dst.bytes, ctxt)) )
+ goto done;
+ dst.val = _regs.esp;
+
+ if ( depth > 0 )
+ {
+ for ( i = 1; i < depth; i++ )
+ {
+ unsigned long ebp, temp_data;
+ ebp = _truncate_ea(_regs.ebp - i*dst.bytes, ctxt->sp_size/8);
+ if ( (rc = ops->read(x86_seg_ss, ebp,
+ &temp_data, dst.bytes, ctxt)) ||
+ (rc = ops->write(x86_seg_ss, sp_pre_dec(dst.bytes),
+ temp_data, dst.bytes, ctxt)) )
+ goto done;
+ }
+ if ( (rc = ops->write(x86_seg_ss, sp_pre_dec(dst.bytes),
+ dst.val, dst.bytes, ctxt)) )
+ goto done;
+ }
+
+ sp_pre_dec(size);
+ break;
+ }
+
+ case 0xc9: /* leave */
+ /* First writeback, to %%esp. */
+ dst.type = OP_REG;
+ dst.bytes = (mode_64bit() && (op_bytes == 4)) ? 8 : op_bytes;
+ dst.reg = (unsigned long *)&_regs.esp;
+ dst.val = _regs.ebp;
+
+ /* Flush first writeback, since there is a second. */
+ switch ( dst.bytes )
+ {
+ case 1: *(uint8_t *)dst.reg = (uint8_t)dst.val; break;
+ case 2: *(uint16_t *)dst.reg = (uint16_t)dst.val; break;
+ case 4: *dst.reg = (uint32_t)dst.val; break; /* 64b: zero-ext */
+ case 8: *dst.reg = dst.val; break;
+ }
+
+ /* Second writeback, to %%ebp. */
+ dst.reg = (unsigned long *)&_regs.ebp;
+ if ( (rc = ops->read(x86_seg_ss, sp_post_inc(dst.bytes),
+ &dst.val, dst.bytes, ctxt)) )
+ goto done;
+ break;
+
case 0xca: /* ret imm16 (far) */
case 0xcb: /* ret (far) */ {
int offset = (b == 0xca) ? insn_fetch_type(uint16_t) : 0;
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