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target/arm: Fix stlxp for aarch64_be

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ldxp loads two consecutive doublewords from memory regardless of CPU
endianness. On store, stlxp currently assumes to work with a 128bit
value and consequently switches order in big-endian mode. With this
change it packs the doublewords in reverse order in anticipation of the
128bit big-endian store operation interposing them so they end up in
memory in the right order. This makes it work for both MTTCG and !MTTCG.
It effectively implements the ARM ARM STLXP operation pseudo-code:

data = if BigEndian() then el1:el2 else el2:el1;

With this change an aarch64_be Linux 4.14.4 kernel succeeds to boot up
in system emulation mode.

Backports commit 0785557f8811133bd69be02aeccf018d47a26373 from qemu
This commit is contained in:
Michael Weiser 2018-03-06 08:45:34 -05:00 committed by Lioncash
parent 0a43963f3b
commit 5fabebabee
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 5 additions and 2 deletions
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7
qemu/target/arm/helper-a64.c
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@ -506,8 +506,11 @@ uint64_t HELPER(paired_cmpxchg64_le)(CPUARMState *env, uint64_t addr,
Int128 oldv, cmpv, newv;
bool success;
cmpv = int128_make128(env->exclusive_val, env->exclusive_high);
newv = int128_make128(new_lo, new_hi);
/* high and low need to be switched here because this is not actually a
* 128bit store but two doublewords stored consecutively
*/
cmpv = int128_make128(env->exclusive_high, env->exclusive_val);
newv = int128_make128(new_hi, new_lo);
if (env->uc->parallel_cpus) {
#ifndef CONFIG_ATOMIC128