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path: root/hw/xfree86/x86emu
authorAdam Jackson <ajax@redhat.com>2010-12-10 19:24:02 (GMT)
committer Adam Jackson <ajax@redhat.com>2011-01-04 14:23:52 (GMT)
commitbb18f277156c08be028a6e12d8987fb1593e9168 (patch) (side-by-side diff)
treec4ec43729ade318825fbc4a204d2d0cc1ec41f9c /hw/xfree86/x86emu
parent261d0d16af797bb52d4c778e220296d7f2b28e14 (diff)
downloadxserver-bb18f277156c08be028a6e12d8987fb1593e9168.zip
xserver-bb18f277156c08be028a6e12d8987fb1593e9168.tar.gz
x86emu: Fix more mis-decoding of the data prefix
cc2c73ddcb4370a7c3ad439cda4da825156c26c9's three-cent titanium tax doesn't go too far enough. Fix the rest of the call and jmp instructions to handle the data prefix correctly. Reference: Intel 64 and IA-32 Architectures Software Developer's Manual Volume 2A: Instruction Set Reference, A-M http://www.intel.com/Assets/PDF/manual/253666.pdf Reviewed-by: Julien Cristau <jcristau@debian.org> Signed-off-by: Adam Jackson <ajax@redhat.com>
Diffstat (limited to 'hw/xfree86/x86emu') (more/less context) (ignore whitespace changes)
-rw-r--r--hw/xfree86/x86emu/ops.c63
1 files changed, 45 insertions, 18 deletions
diff --git a/hw/xfree86/x86emu/ops.c b/hw/xfree86/x86emu/ops.c
index c6b2f0a..5d3cac1 100644
--- a/hw/xfree86/x86emu/ops.c
+++ b/hw/xfree86/x86emu/ops.c
@@ -7065,15 +7065,20 @@ Handles opcode 0x9a
****************************************************************************/
static void x86emuOp_call_far_IMM(u8 X86EMU_UNUSED(op1))
{
- u16 farseg, faroff;
+ u32 farseg, faroff;
START_OF_INSTR();
- DECODE_PRINTF("CALL\t");
+ DECODE_PRINTF("CALL\t");
+ if (M.x86.mode & SYSMODE_PREFIX_DATA) {
+ faroff = fetch_long_imm();
+ farseg = fetch_word_imm();
+ } else {
faroff = fetch_word_imm();
farseg = fetch_word_imm();
- DECODE_PRINTF2("%04x:", farseg);
- DECODE_PRINTF2("%04x\n", faroff);
- CALL_TRACE(M.x86.saved_cs, M.x86.saved_ip, farseg, faroff, "FAR ");
+ }
+ DECODE_PRINTF2("%04x:", farseg);
+ DECODE_PRINTF2("%04x\n", faroff);
+ CALL_TRACE(M.x86.saved_cs, M.x86.saved_ip, farseg, faroff, "FAR ");
/* XXX
*
@@ -7084,8 +7089,12 @@ static void x86emuOp_call_far_IMM(u8 X86EMU_UNUSED(op1))
TRACE_AND_STEP();
push_word(M.x86.R_CS);
M.x86.R_CS = farseg;
- push_word(M.x86.R_IP);
- M.x86.R_IP = faroff;
+ if (M.x86.mode & SYSMODE_PREFIX_DATA) {
+ push_long(M.x86.R_EIP);
+ } else {
+ push_word(M.x86.R_IP);
+ }
+ M.x86.R_EIP = faroff & 0xffff;
DECODE_CLEAR_SEGOVR();
END_OF_INSTR();
}
@@ -9670,17 +9679,30 @@ Handles opcode 0xe8
****************************************************************************/
static void x86emuOp_call_near_IMM(u8 X86EMU_UNUSED(op1))
{
- s16 ip;
+ s16 ip16;
+ s32 ip32;
START_OF_INSTR();
- DECODE_PRINTF("CALL\t");
- ip = (s16) fetch_word_imm();
- ip += (s16) M.x86.R_IP; /* CHECK SIGN */
- DECODE_PRINTF2("%04x\n", (u16)ip);
- CALL_TRACE(M.x86.saved_cs, M.x86.saved_ip, M.x86.R_CS, ip, "");
+ DECODE_PRINTF("CALL\t");
+ if (M.x86.mode & SYSMODE_PREFIX_DATA) {
+ ip32 = (s32) fetch_long_imm();
+ ip32 += (s16) M.x86.R_IP; /* CHECK SIGN */
+ DECODE_PRINTF2("%04x\n", (u16)ip32);
+ CALL_TRACE(M.x86.saved_cs, M.x86.saved_ip, M.x86.R_CS, ip32, "");
+ } else {
+ ip16 = (s16) fetch_word_imm();
+ ip16 += (s16) M.x86.R_IP; /* CHECK SIGN */
+ DECODE_PRINTF2("%04x\n", (u16)ip16);
+ CALL_TRACE(M.x86.saved_cs, M.x86.saved_ip, M.x86.R_CS, ip16, "");
+ }
TRACE_AND_STEP();
- push_word(M.x86.R_IP);
- M.x86.R_IP = ip;
+ if (M.x86.mode & SYSMODE_PREFIX_DATA) {
+ push_long(M.x86.R_EIP);
+ M.x86.R_EIP = ip32 & 0xffff;
+ } else {
+ push_word(M.x86.R_IP);
+ M.x86.R_EIP = ip16;
+ }
DECODE_CLEAR_SEGOVR();
END_OF_INSTR();
}
@@ -9718,16 +9740,21 @@ Handles opcode 0xea
****************************************************************************/
static void x86emuOp_jump_far_IMM(u8 X86EMU_UNUSED(op1))
{
- u16 cs, ip;
+ u16 cs;
+ u32 ip;
START_OF_INSTR();
DECODE_PRINTF("JMP\tFAR ");
- ip = fetch_word_imm();
+ if (M.x86.mode & SYSMODE_PREFIX_DATA) {
+ ip = fetch_long_imm();
+ } else {
+ ip = fetch_word_imm();
+ }
cs = fetch_word_imm();
DECODE_PRINTF2("%04x:", cs);
DECODE_PRINTF2("%04x\n", ip);
TRACE_AND_STEP();
- M.x86.R_IP = ip;
+ M.x86.R_EIP = ip & 0xffff;
M.x86.R_CS = cs;
DECODE_CLEAR_SEGOVR();
END_OF_INSTR();