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

*** 23,32 ****
--- 23,33 ----
  # Copyright 2012 DEY Storage Systems, Inc.  All rights reserved.
  # Copyright 2018 Joyent, Inc.
  # Copyright (c) 2013 by Delphix. All rights reserved.
  # Copyright (c) 2019 Carlos Neira <cneirabustos@gmail.com>
  # Copyright 2020 OmniOS Community Edition (OmniOSce) Association.
+ # Copyright 2023 Oxide Computer Company
  #
  
  #
  # MAPFILE HEADER START
  #
*** 74,91 ****
--- 75,98 ----
          Lclearsig;
          Lctlfd;
          Ldstop;
          Lfree;
          Lgetareg;
+         Lgetfpregs;
+         Lgetregs;
+         Lgetxregs;
          Lgrab;
          Lgrab_error;
          _libproc_debug  { ASSERT = { TYPE = OBJECT; SIZE = 4; }; };
          Lmain_stack;
          Lprochandle;
          Lpsinfo;
          Lputareg;
+         Lsetfpregs;
+         Lsetregs;
          Lsetrun;
+         Lsetxregs;
          Lstack;
          Lstate;
          Lstatus;
          Lstop;
          Lsync;
*** 135,154 ****
--- 142,164 ----
          Plmid_to_loadobj;
          Plmid_to_map;
          Plookup_by_addr;
          Plookup_by_name;
          Plwp_alt_stack;
+         Plwp_freexregs;
          Plwp_getfpregs;
          Plwp_getname;
          Plwp_getpsinfo;
          Plwp_getregs;
          Plwp_getspymaster;
+         Plwp_getxregs;
          Plwp_iter;
          Plwp_iter_all;
          Plwp_main_stack;
          Plwp_setfpregs;
          Plwp_setregs;
+         Plwp_setxregs;
          Plwp_stack;
          Pmapping_iter;
          Pmapping_iter_resolved;
          Pname_to_ctf;
          Pname_to_loadobj;
*** 270,281 ****
--- 280,294 ----
          Psetzoneid;
          Psignal;
          ps_lcontinue;
          ps_lgetfpregs;
          ps_lgetregs;
+         ps_lgetxregs;
+         ps_lgetxregsize;
          ps_lsetfpregs;
          ps_lsetregs;
+         ps_lsetxregs;
          ps_lstop;
          ps_pauxv;
          ps_pbrandname;
          ps_pcontinue;
          ps_pdmodel;
*** 330,345 ****
          ps_lgetLDT;
  $endif
  
  $if _sparc
          Plwp_getgwindows;
-         Plwp_getxregs;
-         Plwp_setxregs;
-         ps_lgetxregs;
-         ps_lgetxregsize;
-         ps_lsetxregs;
- 
  $if _ELF64
          Plwp_getasrs;
          Plwp_setasrs;
  $endif
  $endif
--- 343,352 ----