REPE tests ZF after the string instruction is executed. Try it with ZF
initially clear to make sure.
Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
---
x86/emulator.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/x86/emulator.c b/x86/emulator.c
index 04adce7..d30ca8e 100644
--- a/x86/emulator.c
+++ b/x86/emulator.c
@@ -53,6 +53,13 @@ void test_cmps_one(unsigned char *m1, unsigned char *m3)
: : "cc");
report("repe/cmpsb (1)", rcx == 0 && rsi == m1 + 30 && rdi == m3 + 30);
+ rsi = m1; rdi = m3; rcx = 30;
+ asm volatile("or $1, %[tmp]\n\t" // clear ZF
+ "repe/cmpsb"
+ : "+S"(rsi), "+D"(rdi), "+c"(rcx), [tmp]"=&r"(tmp)
+ : : "cc");
+ report("repe/cmpsb (1.zf)", rcx == 0 && rsi == m1 + 30 && rdi == m3 + 30);
+
rsi = m1; rdi = m3; rcx = 15;
asm volatile("xor %[tmp], %[tmp] \n\t"
"repe/cmpsw"
--
1.7.1
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
