arch/s390/kernel/base.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  arch/s390/kernel/base.S
   4  *
   5  *    Copyright IBM Corp. 2006, 2007
   6  *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
   7  *               Michael Holzheu <holzheu@de.ibm.com>
   8  */
   9
  10 #include <linux/linkage.h>
  11 #include <asm/asm-offsets.h>
  12 #include <asm/nospec-insn.h>
  13 #include <asm/ptrace.h>
  14
  15         GEN_BR_THUNK %r9
  16         GEN_BR_THUNK %r14
  17
  18 ENTRY(s390_base_pgm_handler)
  19         stmg    %r0,%r15,__LC_SAVE_AREA_SYNC
  20         basr    %r13,0
  21 0:      aghi    %r15,-STACK_FRAME_OVERHEAD
  22         larl    %r1,s390_base_pgm_handler_fn
  23         lg      %r9,0(%r1)
  24         ltgr    %r9,%r9
  25         jz      1f
  26         BASR_EX %r14,%r9
  27         lmg     %r0,%r15,__LC_SAVE_AREA_SYNC
  28         lpswe   __LC_PGM_OLD_PSW
  29 1:      lpswe   disabled_wait_psw-0b(%r13)
  30 ENDPROC(s390_base_pgm_handler)
  31
  32         .align  8
  33 disabled_wait_psw:
  34         .quad   0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler
  35
  36         .section .bss
  37         .align 8
  38         .globl s390_base_pgm_handler_fn
  39 s390_base_pgm_handler_fn:
  40         .quad   0
  41         .previous