2002-11-13 Andrew Cagney <cagney@redhat.com>

2002-11-13  Andrew Cagney  <cagney@redhat.com>

	* regcache.c (struct regcache): Replace passthough_p with
	readonly_p.
	(regcache_xmalloc): Initialize readonly_p.
	(build_regcache): Initialize readonly_p.
	(regcache_save): New function.
	(regcache_restore): New function.
	(regcache_cpy): Re-implement using regcache_save and
	regcache_restore.
	(regcache_raw_read): Update.
	(regcache_cooked_read): When a read-only cache, checked for cached
	pseudo register values.
	(regcache_raw_write): Assert that the cache is not read-only.
	Remove code handling a non-passthrough cache.
	* regcache.h (regcache_save): Declare.
	(regcache_restore): Declare.