misc: create C declarations for the _addr and _semi m5ops

Symbols such as m5_exit_addr are already present in the libm5.a, but were
not previously exposed in a header. This commit allows external C programs
to use those versions of the functions as well.

Change-Id: I925e3af7bd6cb23e06fb744d453153323afb9310
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/36896
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

include/gem5/m5ops.h

@@ -35,6 +35,8 @@ extern "C" {
 
 #include <stdint.h>
 
+#include <gem5/asm/generic/m5ops.h>
+
 void m5_arm(uint64_t address);
 void m5_quiesce(void);
 void m5_quiesce_ns(uint64_t ns);
@@ -73,6 +75,20 @@ void m5_work_end(uint64_t workid, uint64_t threadid);
  */
 void m5_workload();
 
+/*
+ * Create _addr and _semi versions all declarations, e.g. m5_exit_addr and
+ * m5_exit_semi. These expose the the memory and semihosting variants of the
+ * ops.
+ *
+ * Some of those declarations are not defined for certain ISAs, e.g. X86
+ * does not have _semi, but we felt that ifdefing them out could cause more
+ * trouble tham leaving them in.
+ */
+#define M5OP(name, func) __typeof__(name) M5OP_MERGE_TOKENS(name, _addr); \
+                         __typeof__(name) M5OP_MERGE_TOKENS(name, _semi);
+M5OP_FOREACH
+#undef M5OP
+
 #ifdef __cplusplus
 }
 #endif