Add patch_area_size and patch_area_entry to crtl

Currently patchable area is at the wrong place.  It is placed immediately
after function label and before .cfi_startproc.  A backend should be able
to add a pseudo patchable area instruction durectly into RTL.  This patch
adds patch_area_size and patch_area_entry to crtl so that the patchable
area info is available in RTL passes.

It also limits patch_area_size and patch_area_entry to 65535, which is
a reasonable maximum size for patchable area.

gcc/

	PR target/93492
	* cfgexpand.c (pass_expand::execute): Set crtl->patch_area_size
	and crtl->patch_area_entry.
	* emit-rtl.h (rtl_data): Add patch_area_size and patch_area_entry.
	* opts.c (common_handle_option): Limit
	function_entry_patch_area_size and function_entry_patch_area_start
	to USHRT_MAX.  Fix a typo in error message.
	* varasm.c (assemble_start_function): Use crtl->patch_area_size
	and crtl->patch_area_entry.
	* doc/invoke.texi: Document the maximum value for
	-fpatchable-function-entry.

gcc/c-family/

	PR target/93492
	* c-attribs.c (handle_patchable_function_entry_attribute): Limit
	value to USHRT_MAX (65535).

gcc/testsuite/

	PR target/93492
	* c-c++-common/patchable_function_entry-error-1.c: New test.
	* c-c++-common/patchable_function_entry-error-2.c: Likewise.
	* c-c++-common/patchable_function_entry-error-3.c: Likewise.

1 files changed, 3 insertions, 1 deletions

diff --git a/gcc/opts.c b/gcc/opts.c
index c212a1a..3dccef3 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -2615,10 +2615,12 @@ common_handle_option (struct gcc_options *opts,
 	    function_entry_patch_area_start = 0;
 	  }
 	if (function_entry_patch_area_size < 0
+	    || function_entry_patch_area_size > USHRT_MAX
 	    || function_entry_patch_area_start < 0
+	    || function_entry_patch_area_start > USHRT_MAX
 	    || function_entry_patch_area_size 
 		< function_entry_patch_area_start)
-	  error ("invalid arguments for %<-fpatchable_function_entry%>");
+	  error ("invalid arguments for %<-fpatchable-function-entry%>");
 	free (patch_area_arg);
       }
       break;