[PATCH v2] linux-user/armeb: Fix __kernel_cmpxchg() for armeb

[Helge Deller <deller@gmx.de>]

Commit 7f4f0d9ea870 ("linux-user/arm: Implement __kernel_cmpxchg with host
atomics") switched to use qatomic_cmpxchg() to swap a word with the memory
content, but missed to endianess-swap the oldval and newval values when
emulating an armeb CPU, which expects words to be stored in big endian in
the guest memory.

The bug can be verified with qemu >= v7.2 on any little-endian host, when
starting the armeb binary of the upx program, which just hangs without
this patch.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-stable@nongnu.org
Reported-by: "Markus F.X.J. Oberhumer" <markus@oberhumer.com>
Reported-by: John Reiser <jreiser@BitWagon.com>
Closes: https://github.com/upx/upx/issues/687

--
v2:
- add tswap32() in arm_kernel_cmpxchg64_helper()


diff --git a/linux-user/arm/cpu_loop.c b/linux-user/arm/cpu_loop.c
index a992423257..0907cd8c15 100644
--- a/linux-user/arm/cpu_loop.c
+++ b/linux-user/arm/cpu_loop.c
@@ -117,8 +117,9 @@ static void arm_kernel_cmpxchg32_helper(CPUARMState *env)
 {
     uint32_t oldval, newval, val, addr, cpsr, *host_addr;

-    oldval = env->regs[0];
-    newval = env->regs[1];
+    /* endianess-swap if emulating armeb */
+    oldval = tswap32(env->regs[0]);
+    newval = tswap32(env->regs[1]);
     addr = env->regs[2];

     mmap_lock();
@@ -174,6 +175,10 @@ static void arm_kernel_cmpxchg64_helper(CPUARMState *env)
         return;
     }

+    /* endianess-swap if emulating armeb */
+    oldval = tswap32(oldval);
+    newval = tswap32(newval);
+
 #ifdef CONFIG_ATOMIC64
     val = qatomic_cmpxchg__nocheck(host_addr, oldval, newval);
     cpsr = (val == oldval) * CPSR_C;