15254 %ymm registers not restored after signal handler
15367 x86 getfpregs() summons corrupting %xmm ghosts
15333 want x86 /proc xregs support (libc_db, libproc, mdb, etc.)
15336 want libc functions for extended ucontext_t
15334 want ps_lwphandle-specific reg routines
15328 FPU_CW_INIT mistreats reserved bit
15335 i86pc fpu_subr.c isn't really platform-specific
15332 setcontext(2) isn't actually noreturn
15331 need <sys/stdalign.h>
Change-Id: I7060aa86042dfb989f77fc3323c065ea2eafa9ad
Conflicts:
    usr/src/uts/common/fs/proc/prcontrol.c
    usr/src/uts/intel/os/archdep.c
    usr/src/uts/intel/sys/ucontext.h
    usr/src/uts/intel/syscall/getcontext.c

@@ -19,11 +19,11 @@
 #
 # CDDL HEADER END
 #
 # Copyright 2015 Toomas Soome <tsoome@me.com>
 # Copyright 2016 Nexenta Systems, Inc.
-# Copyright 2020 Oxide Computer Company
+# Copyright 2023 Oxide Computer Company
 #
 # Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 # Copyright (c) 2015 by Delphix. All rights reserved.

@@ -611,27 +611,27 @@
                 err("improper boolean continuation");
         }
         if (/\S   *(&&|\|\|)/ || /(&&|\|\|)   *\S/) {
                 err("more than one space around boolean operator");
         }
-        if (/\b(for|if|while|switch|sizeof|return|case)\(/) {
+        if (/\b(for|if|while|switch|sizeof|alignof|return|case)\(/) {
                 err("missing space between keyword and paren");
         }
         if (/(\b(for|if|while|switch|return)\b.*){2,}/ && !/^#define/) {
                 # multiple "case" and "sizeof" allowed
                 err("more than one keyword on line");
         }
-        if (/\b(for|if|while|switch|sizeof|return|case)\s\s+\(/ &&
+        if (/\b(for|if|while|switch|sizeof|alignof|return|case)\s\s+\(/ &&
             !/^#if\s+\(/) {
                 err("extra space between keyword and paren");
         }
         # try to detect "func (x)" but not "if (x)" or
         # "#define foo (x)" or "int (*func)();"
         if (/\w\s\(/) {
                 my $s = $_;
                 # strip off all keywords on the line
-                s/\b(for|if|while|switch|return|case|sizeof)\s\(/XXX(/g;
+                s/\b(for|if|while|switch|return|case|alignof|sizeof)\s\(/XXX(/g;
                 s/#elif\s\(/XXX(/g;
                 s/^#define\s+\w+\s+\(/XXX(/;
                 # do not match things like "void (*f)();"
                 # or "typedef void (func_t)();"
                 s/\w\s\(+\*/XXX(*/g;

@@ -660,10 +660,13 @@
                 err("unparenthesized return expression");
         }
         if (/\bsizeof\b/ && !/\bsizeof\s*\(.*\)/) {
                 err("unparenthesized sizeof expression");
         }
+        if (/\balignof\b/ && !/\balignof\s*\(.*\)/) {
+                err("unparenthesized alignof expression");
+        }
         if (/\(\s/) {
                 err("whitespace after left paren");
         }
         # allow "for" statements to have empty "continue" clauses
         if (/\s\)/ && !/^\s*for \([^;]*;[^;]*; \)/) {