diff options
Diffstat (limited to 'arch/s390/kernel/early.c')
| -rw-r--r-- | arch/s390/kernel/early.c | 38 |
1 files changed, 33 insertions, 5 deletions
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 14d324865e33..62f8f5a750a3 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -7,6 +7,7 @@ #define KMSG_COMPONENT "setup" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt +#include <linux/sched/debug.h> #include <linux/compiler.h> #include <linux/init.h> #include <linux/errno.h> @@ -175,20 +176,45 @@ static __init void setup_topology(void) topology_max_mnest = max_mnest; } -void __do_early_pgm_check(struct pt_regs *regs) +void __init __do_early_pgm_check(struct pt_regs *regs) { - if (!fixup_exception(regs)) - disabled_wait(); + struct lowcore *lc = get_lowcore(); + unsigned long ip; + + regs->int_code = lc->pgm_int_code; + regs->int_parm_long = lc->trans_exc_code; + ip = __rewind_psw(regs->psw, regs->int_code >> 16); + + /* Monitor Event? Might be a warning */ + if ((regs->int_code & PGM_INT_CODE_MASK) == 0x40) { + if (report_bug(ip, regs) == BUG_TRAP_TYPE_WARN) + return; + } + if (fixup_exception(regs)) + return; + /* + * Unhandled exception - system cannot continue but try to get some + * helpful messages to the console. Use early_printk() to print + * some basic information in case it is too early for printk(). + */ + register_early_console(); + early_printk("PANIC: early exception %04x PSW: %016lx %016lx\n", + regs->int_code & 0xffff, regs->psw.mask, regs->psw.addr); + show_regs(regs); + disabled_wait(); } static noinline __init void setup_lowcore_early(void) { + struct lowcore *lc = get_lowcore(); psw_t psw; psw.addr = (unsigned long)early_pgm_check_handler; psw.mask = PSW_KERNEL_BITS; - get_lowcore()->program_new_psw = psw; - get_lowcore()->preempt_count = INIT_PREEMPT_COUNT; + lc->program_new_psw = psw; + lc->preempt_count = INIT_PREEMPT_COUNT; + lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); + lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); } static __init void detect_diag9c(void) @@ -242,6 +268,8 @@ static __init void detect_machine_facilities(void) } if (test_facility(194)) get_lowcore()->machine_flags |= MACHINE_FLAG_RDP; + if (test_facility(85)) + get_lowcore()->machine_flags |= MACHINE_FLAG_SEQ_INSN; } static inline void save_vector_registers(void) |