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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

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          --- old/usr/src/cmd/truss/systable.c
          +++ new/usr/src/cmd/truss/systable.c
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 674  674  {"sigpending",  2, DEC, NOV, HID, HEX},                         /* 1 */
 675  675  {"sigfillset",  2, DEC, NOV, HID, HEX},                         /* 2 */
 676  676  };
 677  677  #define NSGPCODE        (sizeof (sgptable) / sizeof (struct systable))
 678  678  
 679  679  const   struct systable ctxtable[] = {
 680  680  {"getcontext",  2, DEC, NOV, HID, HEX},                         /* 0 */
 681  681  {"setcontext",  2, DEC, NOV, HID, HEX},                         /* 1 */
 682  682  {"getustack",   2, DEC, NOV, HID, HEX},                         /* 2 */
 683  683  {"setustack",   2, DEC, NOV, HID, HEX},                         /* 3 */
      684 +{"getcontext_extd",     2, DEC, NOV, HID, HEX},                         /* 4 */
 684  685  };
 685  686  #define NCTXCODE        (sizeof (ctxtable) / sizeof (struct systable))
 686  687  
 687  688  const   struct systable hrttable[] = {
 688  689  {"hrtcntl",     5, DEC, NOV, HID, DEC, DEC, HEX, HEX},          /* 0 */
 689  690  {"hrtalarm",    3, DEC, NOV, HID, HEX, DEC},                    /* 1 */
 690  691  {"hrtsleep",    2, DEC, NOV, HID, HEX},                         /* 2 */
 691  692  {"hrtcancel",   3, DEC, NOV, HID, HEX, DEC},                    /* 3 */
 692  693  };
 693  694  #define NHRTCODE        (sizeof (hrttable) / sizeof (struct systable))
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