ntdll: Use memcpy() in set_float_reg().

The source address might not be aligned although the compiler can expect alignment when using a plain assignment. Signed-off-by: Matteo Bruni <mbruni@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

ntdll: Use memcpy() in set_float_reg().
2e5c2c7c · Matteo Bruni · Alexandre Julliard · 2716e215 · 2e5c2c7c
Commit 2e5c2c7c authored May 22, 2020 by Matteo Bruni Committed by Alexandre Julliard May 25, 2020
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signal_x86_64.c dlls/ntdll/signal_x86_64.c +2 -1

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--- a/dlls/ntdll/signal_x86_64.c
+++ b/dlls/ntdll/signal_x86_64.c
@@ -3298,7 +3298,8 @@ static void set_int_reg( CONTEXT *context, KNONVOLATILE_CONTEXT_POINTERS *ctx_pt

 static void set_float_reg( CONTEXT *context, KNONVOLATILE_CONTEXT_POINTERS *ctx_ptr, int reg, M128A *val )
 {
-    *(&context->u.s.Xmm0 + reg) = *val;
+    /* Use a memcpy() to avoid issues if val is misaligned. */
+    memcpy(&context->u.s.Xmm0 + reg, val, sizeof(*val));
    if (ctx_ptr) ctx_ptr->u.FloatingContext[reg] = val;
 }