* except.c (EH_RETURN_STACKADJ_RTX): Do not define.

	(EH_RETURN_HANDLER_RTX): Likewise.
	(expand_builtin_eh_return): Do not copy stack adjustment
	if EH_RETURN_STACKADJ_RTX is not defined.
	(expand_eh_return): Likewise.  Also, do not pass stack
	adjustment as argument to the eh_return pattern.
	* except.h (MUST_USE_SJLJ_EXCEPTIONS): Do not define just
	because EH_RETURN_STACKADJ_RTX is not defined.
	* unwind-dw.c (uw_update_context_1): If EH_RETURN_STACKADJ_RTX
	is not defined, treat stack pointer like a regular register.
	(uw_init_context_1): Set up fake initial stack pointer register.
	(uw_install_context_1): Do not compute stack adjustment if
	EH_RETURN_STACKADJ_RTX is not defined.

	* config/i386/i386.md ("eh_return"): Remove first argument.
	* config/mips/mips.md ("eh_return"): Likewise.
	* config/rs6000/rs6000.md ("eh_return"): Likewise.
	* config/sh/sh.md ("eh_return"): Likewise.

	* config/s390/s390.h (EH_RETURN_STACKADJ_RTX): Remove.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@66672 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 11 insertions, 11 deletions

diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index c808d494e9a..f078520ab3d 100644
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -3374,17 +3374,17 @@ and thence the call frame exception handling library routines, are
 built.  It is intended to handle non-trivial actions needed along
 the abnormal return path.
 
-The pattern takes two arguments.  The first is an offset to be applied
-to the stack pointer.  It will have been copied to some appropriate
-location (typically @code{EH_RETURN_STACKADJ_RTX}) which will survive
-until after reload to when the normal epilogue is generated.
-The second argument is the address of the exception handler to which
-the function should return.  This will normally need to copied by the
-pattern to some special register or memory location.
-
-This pattern only needs to be defined if call frame exception handling
-is to be used, and simple moves involving @code{EH_RETURN_STACKADJ_RTX}
-and @code{EH_RETURN_HANDLER_RTX} are not sufficient.
+The address of the exception handler to which the function should return
+is passed as operand to this pattern.  It will normally need to copied by 
+the pattern to some special register or memory location.
+If the pattern needs to determine the location of the target call
+frame in order to do so, it may use @code{EH_RETURN_STACKADJ_RTX},
+if defined; it will have already been assigned.
+
+If this pattern is not defined, the default action will be to simply
+copy the return address to @code{EH_RETURN_HANDLER_RTX}.  Either
+that macro or this pattern needs to be defined if call frame exception
+handling is to be used.
 
 @cindex @code{prologue} instruction pattern
 @anchor{prologue instruction pattern}