diff options
| author | Alex Richardson <Alexander.Richardson@cl.cam.ac.uk> | 2020-02-02 15:34:09 +0000 |
|---|---|---|
| committer | Aleksandar Markovic <amarkovic@wavecomp.com> | 2020-02-04 08:51:41 +0100 |
| commit | ec860426dfbebe0c9995e12cd82935a94fde5215 (patch) | |
| tree | 9130b31cfa03a5e183ca3ef9adddc21e77dd4fb4 /target/mips | |
| parent | f31160c7d1b89cfb4dd4001a23575b42141cb0ec (diff) | |
target/mips: Fix handling of LL/SC instructions after 7dd547e5ab
After 7dd547e5ab6b31e7a0cfc182d3ad131dd55a948f the env->llval value
is loaded as an unsigned value (instead of sign-extended as before).
Therefore, the CMPXCHG in gen_st_cond() in translate.c fails if the
sign bit is set in the loaded value.
Fix this by sign-extending the llval value for the 32-bit case.
I discovered this issue because FreeBSD MIPS64 was looping forever
in an atomic helper function when trying to start /sbin/init.
Signed-off-by: Alex Richardson <Alexander.Richardson@cl.cam.ac.uk>
Fixes: 7dd547e5ab ("target/mips: Use cpu_*_mmuidx_ra instead of MMU_MODE*_SUFFIX")
Buglink: https://bugs.launchpad.net/qemu/+bug/1861605
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Aleksandar Markovic <amarkovic@wavecomp.com>
Cc: Aleksandar Rikalo <aleksandar.rikalo@rt-rk.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: James Clarke <jrtc27@jrtc27.com>
Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20200202153409.28534-1-jrtc27@jrtc27.com>
Diffstat (limited to 'target/mips')
| -rw-r--r-- | target/mips/op_helper.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/target/mips/op_helper.c b/target/mips/op_helper.c index 15d05a5fbc..467914d1ca 100644 --- a/target/mips/op_helper.c +++ b/target/mips/op_helper.c @@ -305,7 +305,7 @@ static inline hwaddr do_translate_address(CPUMIPSState *env, } } -#define HELPER_LD_ATOMIC(name, insn, almask) \ +#define HELPER_LD_ATOMIC(name, insn, almask, do_cast) \ target_ulong helper_##name(CPUMIPSState *env, target_ulong arg, int mem_idx) \ { \ if (arg & almask) { \ @@ -316,12 +316,12 @@ target_ulong helper_##name(CPUMIPSState *env, target_ulong arg, int mem_idx) \ } \ env->CP0_LLAddr = do_translate_address(env, arg, 0, GETPC()); \ env->lladdr = arg; \ - env->llval = cpu_##insn##_mmuidx_ra(env, arg, mem_idx, GETPC()); \ + env->llval = do_cast cpu_##insn##_mmuidx_ra(env, arg, mem_idx, GETPC()); \ return env->llval; \ } -HELPER_LD_ATOMIC(ll, ldl, 0x3) +HELPER_LD_ATOMIC(ll, ldl, 0x3, (target_long)(int32_t)) #ifdef TARGET_MIPS64 -HELPER_LD_ATOMIC(lld, ldq, 0x7) +HELPER_LD_ATOMIC(lld, ldq, 0x7, (target_ulong)) #endif #undef HELPER_LD_ATOMIC #endif |