[PATCH] target/hppa: Generate illegal instruction exception for 64-bit instructions

[Helge Deller <deller@gmx.de>]

Qemu currently emulates a 32-bit CPU only, and crashes with this error
when it faces a 64-bit load (e.g.  "ldd 0(r26),r0") or 64-bit store
(e.g. "std r26,0(r26)") instruction in the guest:

ERROR:../qemu/tcg/tcg-op.c:2822:tcg_canonicalize_memop: code should not be reached

Fix this by adding checks for 64-bit sizes and generate an illegal
instruction exception if necessary.

Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/target/hppa/translate.c b/target/hppa/translate.c
index b8dbfee5e9..287cc410cd 100644
--- a/target/hppa/translate.c
+++ b/target/hppa/translate.c
@@ -1568,7 +1568,12 @@ static bool do_load(DisasContext *ctx, unsigned rt, unsigned rb,
         /* Make sure if RT == RB, we see the result of the load.  */
         dest = get_temp(ctx);
     }
-    do_load_reg(ctx, dest, rb, rx, scale, disp, sp, modify, mop);
+    if (unlikely(TARGET_REGISTER_BITS == 32 && (mop & MO_SIZE) > MO_32)) {
+        gen_illegal(ctx);
+        dest = tcg_constant_reg(0);
+    } else {
+        do_load_reg(ctx, dest, rb, rx, scale, disp, sp, modify, mop);
+    }
     save_gpr(ctx, rt, dest);

     return nullify_end(ctx);
@@ -1631,7 +1636,11 @@ static bool do_store(DisasContext *ctx, unsigned rt, unsigned rb,
                      int modify, MemOp mop)
 {
     nullify_over(ctx);
-    do_store_reg(ctx, load_gpr(ctx, rt), rb, 0, 0, disp, sp, modify, mop);
+    if (unlikely(TARGET_REGISTER_BITS == 32 && (mop & MO_SIZE) > MO_32)) {
+        gen_illegal(ctx);
+    } else {
+        do_store_reg(ctx, load_gpr(ctx, rt), rb, 0, 0, disp, sp, modify, mop);
+    }
     return nullify_end(ctx);
 }