mirror of
https://github.com/qemu/qemu.git
synced 2025-01-07 22:23:26 +08:00
043b936ef6
V flag for subtraction is:
v = (res ^ src1) & (src1 ^ src2)
(see COMPUTE_CCR() in target/m68k/helper.c)
But gen_flush_flags() uses:
v = (res ^ src2) & (src1 ^ src2)
The problem has been found with the following program:
.global _start
_start:
move.l #-2147483648,%d0
subq.l #1,%d0
jvc 1f
move.l #1,%d1
move.l #1,%d0
trap #0
1:
move.l #0,%d1
move.l #1,%d0
trap #0
It works fine (exit(1)) on real hardware, and with "-singlestep".
"-singlestep" uses gen_helper_flush_flags(), whereas
without "-singlestep", V flag is computed directly in
gen_flush_flags().
This patch updates gen_flush_flags() to have the same result
as with gen_helper_flush_flags().
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-Id: <20170614203905.19657-1-laurent@vivier.eu>
|
||
|---|---|---|
| .. | ||
| alpha | ||
| arm | ||
| cris | ||
| hppa | ||
| i386 | ||
| lm32 | ||
| m68k | ||
| microblaze | ||
| mips | ||
| moxie | ||
| nios2 | ||
| openrisc | ||
| ppc | ||
| s390x | ||
| sh4 | ||
| sparc | ||
| tilegx | ||
| tricore | ||
| unicore32 | ||
| xtensa | ||