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s390 updates

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- setup stack backchain properly in external and i/o interrupt handler
   to fix stack unwinding. This broke when converting to generic entry.
 
 - save caller address of psw_idle to get a sane stacktrace.
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Merge tag 's390-5.12-7' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 fixes from Heiko Carstens:

 - setup stack backchain properly in external and i/o interrupt handler
   to fix stack unwinding. This broke when converting to generic entry

  - save caller address of psw_idle to get a sane stacktrace

* tag 's390-5.12-7' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/entry: save the caller of psw_idle
  s390/entry: avoid setting up backchain in ext|io handlers
This commit is contained in:
Linus Torvalds 2021-04-14 10:55:56 -07:00
commit 8e2e0104ef
1 changed files with 3 additions and 4 deletions
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7
arch/s390/kernel/entry.S
View file

@ -401,15 +401,13 @@ ENTRY(\name)
brasl %r14,.Lcleanup_sie_int
#endif
0: CHECK_STACK __LC_SAVE_AREA_ASYNC
lgr %r11,%r15
aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
stg %r11,__SF_BACKCHAIN(%r15)
j 2f
1: BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP
lctlg %c1,%c1,__LC_KERNEL_ASCE
lg %r15,__LC_KERNEL_STACK
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
2: la %r11,STACK_FRAME_OVERHEAD(%r15)
2: xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
la %r11,STACK_FRAME_OVERHEAD(%r15)
stmg %r0,%r7,__PT_R0(%r11)
# clear user controlled registers to prevent speculative use
xgr %r0,%r0
@ -445,6 +443,7 @@ INT_HANDLER io_int_handler,__LC_IO_OLD_PSW,do_io_irq
* Load idle PSW.
*/
ENTRY(psw_idle)
stg %r14,(__SF_GPRS+8*8)(%r15)
stg %r3,__SF_EMPTY(%r15)
larl %r1,psw_idle_exit
stg %r1,__SF_EMPTY+8(%r15)