xserver: Branch 'server-1.5-branch'

[Adam Jackson]

 hw/xfree86/x86emu/ops2.c |   63 +++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 55 insertions(+), 8 deletions(-)

New commits:
commit 89d73d759588da2cb9048c6149a456700ad660e8
Author: Adam Jackson <ajax at redhat.com>
Date:   Mon Jun 23 13:59:48 2008 -0400

    Implement bswap in x86emu.
    
    Yes, this is a 486+ instruction and thus not strictly legal in vm86
    mode, but enough BIOSes use it (looking at you VIA) that we might as
    well implement it.
    (cherry picked from commit c8d066a15142678041c1d82ccf530dcdb2ea74ca)

diff --git a/hw/xfree86/x86emu/ops2.c b/hw/xfree86/x86emu/ops2.c
index 324de8a..a1eda76 100644
--- a/hw/xfree86/x86emu/ops2.c
+++ b/hw/xfree86/x86emu/ops2.c
@@ -40,6 +40,12 @@
 
 #include "x86emu/x86emui.h"
 
+#undef bswap_32
+#define bswap_32(x) (((x & 0xff000000) >> 24) | \
+		     ((x & 0x00ff0000) >> 8) | \
+		     ((x & 0x0000ff00) << 8) | \
+		     ((x & 0x000000ff) << 24))
+
 /*----------------------------- Implementation ----------------------------*/
 
 /****************************************************************************
@@ -2571,6 +2577,47 @@ static void x86emuOp2_movsx_word_R_RM(u8 X86EMU_UNUSED(op2))
     END_OF_INSTR();
 }
 
+/* Handles opcodes 0xc8-0xcf */
+static void x86emuOp2_bswap(u8 X86EMU_UNUSED(op2))
+{
+    START_OF_INSTR();
+    DECODE_PRINTF("BSWAP\n");
+    TRACE_AND_STEP();
+
+    switch (op2) {
+	case 0xc8:
+	    M.x86.R_EAX = bswap_32(M.x86.R_EAX);
+	    break;
+	case 0xc9:
+	    M.x86.R_ECX = bswap_32(M.x86.R_ECX);
+	    break;
+	case 0xca:
+	    M.x86.R_EDX = bswap_32(M.x86.R_EDX);
+	    break;
+	case 0xcb:
+	    M.x86.R_EBX = bswap_32(M.x86.R_EBX);
+	    break;
+	case 0xcc:
+	    M.x86.R_ESP = bswap_32(M.x86.R_ESP);
+	    break;
+	case 0xcd:
+	    M.x86.R_EBP = bswap_32(M.x86.R_EBP);
+	    break;
+	case 0xce:
+	    M.x86.R_ESI = bswap_32(M.x86.R_ESI);
+	    break;
+	case 0xcf:
+	    M.x86.R_EDI = bswap_32(M.x86.R_EDI);
+	    break;
+	default:
+	    /* can't happen */
+	    break;
+    }
+
+    DECODE_CLEAR_SEGOVR();
+    END_OF_INSTR();
+}
+
 /***************************************************************************
  * Double byte operation code table:
  **************************************************************************/
@@ -2788,14 +2835,14 @@ void (*x86emu_optab2[256])(u8) =
 /*  0xc5 */ x86emuOp2_illegal_op,
 /*  0xc6 */ x86emuOp2_illegal_op,
 /*  0xc7 */ x86emuOp2_illegal_op,
-/*  0xc8 */ x86emuOp2_illegal_op,  /* TODO: bswap */
-/*  0xc9 */ x86emuOp2_illegal_op,  /* TODO: bswap */
-/*  0xca */ x86emuOp2_illegal_op,  /* TODO: bswap */
-/*  0xcb */ x86emuOp2_illegal_op,  /* TODO: bswap */
-/*  0xcc */ x86emuOp2_illegal_op,  /* TODO: bswap */
-/*  0xcd */ x86emuOp2_illegal_op,  /* TODO: bswap */
-/*  0xce */ x86emuOp2_illegal_op,  /* TODO: bswap */
-/*  0xcf */ x86emuOp2_illegal_op,  /* TODO: bswap */
+/*  0xc8 */ x86emuOp2_bswap,
+/*  0xc9 */ x86emuOp2_bswap,
+/*  0xca */ x86emuOp2_bswap,
+/*  0xcb */ x86emuOp2_bswap,
+/*  0xcc */ x86emuOp2_bswap,
+/*  0xcd */ x86emuOp2_bswap,
+/*  0xce */ x86emuOp2_bswap,
+/*  0xcf */ x86emuOp2_bswap,
 
 /*  0xd0 */ x86emuOp2_illegal_op,
 /*  0xd1 */ x86emuOp2_illegal_op,