m68k: implement move to/from usp register instruction

Fill out the code support for the move to/from usp instructions. They are
being decoded, but there is no code to support there actions. So add it.

Current versions of Linux running on the ColdFire 5208 use these instructions.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Tested-by: Laurent Vivier <laurent@vivier.eu>
Message-id: 1434721406-25288-3-git-send-email-gerg@uclinux.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/target-m68k/translate.c b/target-m68k/translate.c
index 4959b970eae3a1c227349185f5fa182704fd68cc..96d75bf9562b3a826a000039554266bb034ae58c 100644 (file)
--- a/target-m68k/translate.c
+++ b/target-m68k/translate.c
@@ -1995,8 +1995,8 @@ DISAS_INSN(move_from_usp)
         gen_exception(s, s->pc - 2, EXCP_PRIVILEGE);
         return;
     }
-    /* TODO: Implement USP.  */
-    gen_exception(s, s->pc - 2, EXCP_ILLEGAL);
+    tcg_gen_ld_i32(AREG(insn, 0), cpu_env,
+                   offsetof(CPUM68KState, sp[M68K_USP]));
 }
 
 DISAS_INSN(move_to_usp)
@@ -2005,8 +2005,8 @@ DISAS_INSN(move_to_usp)
         gen_exception(s, s->pc - 2, EXCP_PRIVILEGE);
         return;
     }
-    /* TODO: Implement USP.  */
-    gen_exception(s, s->pc - 2, EXCP_ILLEGAL);
+    tcg_gen_st_i32(AREG(insn, 0), cpu_env,
+                   offsetof(CPUM68KState, sp[M68K_USP]));
 }
 
 DISAS_INSN(halt)