Commit f5cdac27 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky

[S390] Fix IRQ tracing in case of PER

In case user space is single stepped (PER) the program check handler
claims too early that IRQs are enabled on the return path.
Subsequent checks will notice that the IRQ mask in the PSW and
what lockdep thinks the IRQ mask should be do not correlate and
therefore will print a warning to the console and disable lockdep.

Fix this by doing all the work within the correct context.
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 1a041a23
......@@ -535,8 +535,16 @@ pgm_no_vtime2:
l %r3,__LC_PGM_ILC # load program interruption code
la %r8,0x7f
nr %r8,%r3 # clear per-event-bit and ilc
be BASED(pgm_exit) # only per or per+check ?
b BASED(pgm_do_call)
be BASED(pgm_exit2) # only per or per+check ?
l %r7,BASED(.Ljump_table)
sll %r8,2
l %r7,0(%r8,%r7) # load address of handler routine
la %r2,SP_PTREGS(%r15) # address of register-save area
basr %r14,%r7 # branch to interrupt-handler
pgm_exit2:
TRACE_IRQS_ON
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
b BASED(sysc_return)
#
# it was a single stepped SVC that is causing all the trouble
......
......@@ -544,8 +544,16 @@ pgm_no_vtime2:
lgf %r3,__LC_PGM_ILC # load program interruption code
lghi %r8,0x7f
ngr %r8,%r3 # clear per-event-bit and ilc
je pgm_exit
j pgm_do_call
je pgm_exit2
sll %r8,3
larl %r1,pgm_check_table
lg %r1,0(%r8,%r1) # load address of handler routine
la %r2,SP_PTREGS(%r15) # address of register-save area
basr %r14,%r1 # branch to interrupt-handler
pgm_exit2:
TRACE_IRQS_ON
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
j sysc_return
#
# it was a single stepped SVC that is causing all the trouble
......
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