diff options
Diffstat (limited to 'arch/s390/kernel/entry64.S')
| -rw-r--r-- | arch/s390/kernel/entry64.S | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 56f5f613b86..29bbfbab733 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -518,6 +518,8 @@ pgm_no_vtime2: #endif lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct lg %r1,__TI_task(%r9) + tm SP_PSW+1(%r15),0x01 # kernel per event ? + jz kernel_per mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID @@ -553,6 +555,16 @@ pgm_no_vtime3: stosm __SF_EMPTY(%r15),0x03 # reenable interrupts j sysc_do_svc +# +# per was called from kernel, must be kprobes +# +kernel_per: + lhi %r0,__LC_PGM_OLD_PSW + sth %r0,SP_TRAP(%r15) # set trap indication to pgm check + la %r2,SP_PTREGS(%r15) # address of register-save area + larl %r14,sysc_leave # load adr. of system ret, no work + jg do_single_step # branch to do_single_step + /* * IO interrupt handler routine */ @@ -815,7 +827,7 @@ restart_go: */ stack_overflow: lg %r15,__LC_PANIC_STACK # change to panic stack - aghi %r1,-SP_SIZE + aghi %r15,-SP_SIZE mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack stmg %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack la %r1,__LC_SAVE_AREA @@ -823,7 +835,7 @@ stack_overflow: je 0f chi %r12,__LC_PGM_OLD_PSW je 0f - la %r1,__LC_SAVE_AREA+16 + la %r1,__LC_SAVE_AREA+32 0: mvc SP_R12(32,%r15),0(%r1) # move %r12-%r15 to stack xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # clear back chain la %r2,SP_PTREGS(%r15) # load pt_regs |