diff options
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/kernel/traps_64.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/sparc/kernel/traps_64.c b/arch/sparc/kernel/traps_64.c index d273a65a0a10..f36a40217f6c 100644 --- a/arch/sparc/kernel/traps_64.c +++ b/arch/sparc/kernel/traps_64.c @@ -1870,6 +1870,7 @@ struct sun4v_error_entry { #define SUN4V_ERR_ATTRS_ASI 0x00000080 #define SUN4V_ERR_ATTRS_PRIV_REG 0x00000100 #define SUN4V_ERR_ATTRS_SPSTATE_MSK 0x00000600 +#define SUN4V_ERR_ATTRS_MCD 0x00000800 #define SUN4V_ERR_ATTRS_SPSTATE_SHFT 9 #define SUN4V_ERR_ATTRS_MODE_MSK 0x03000000 #define SUN4V_ERR_ATTRS_MODE_SHFT 24 @@ -2067,6 +2068,56 @@ static void sun4v_log_error(struct pt_regs *regs, struct sun4v_error_entry *ent, } } +/* Handle memory corruption detected error which is vectored in + * through resumable error trap. + */ +void do_mcd_err(struct pt_regs *regs, struct sun4v_error_entry ent) +{ + siginfo_t info; + + if (notify_die(DIE_TRAP, "MCD error", regs, 0, 0x34, + SIGSEGV) == NOTIFY_STOP) + return; + + if (regs->tstate & TSTATE_PRIV) { + /* MCD exception could happen because the task was + * running a system call with MCD enabled and passed a + * non-versioned pointer or pointer with bad version + * tag to the system call. In such cases, hypervisor + * places the address of offending instruction in the + * resumable error report. This is a deferred error, + * so the read/write that caused the trap was potentially + * retired long time back and we may have no choice + * but to send SIGSEGV to the process. + */ + const struct exception_table_entry *entry; + + entry = search_exception_tables(regs->tpc); + if (entry) { + /* Looks like a bad syscall parameter */ +#ifdef DEBUG_EXCEPTIONS + pr_emerg("Exception: PC<%016lx> faddr<UNKNOWN>\n", + regs->tpc); + pr_emerg("EX_TABLE: insn<%016lx> fixup<%016lx>\n", + ent.err_raddr, entry->fixup); +#endif + regs->tpc = entry->fixup; + regs->tnpc = regs->tpc + 4; + return; + } + } + + /* Send SIGSEGV to the userspace process with the right signal + * code + */ + info.si_signo = SIGSEGV; + info.si_errno = 0; + info.si_code = SEGV_ADIDERR; + info.si_addr = (void __user *)ent.err_raddr; + info.si_trapno = 0; + force_sig_info(SIGSEGV, &info, current); +} + /* We run with %pil set to PIL_NORMAL_MAX and PSTATE_IE enabled in %pstate. * Log the event and clear the first word of the entry. */ @@ -2104,6 +2155,14 @@ void sun4v_resum_error(struct pt_regs *regs, unsigned long offset) goto out; } + /* If this is a memory corruption detected error vectored in + * by HV through resumable error trap, call the handler + */ + if (local_copy.err_attrs & SUN4V_ERR_ATTRS_MCD) { + do_mcd_err(regs, local_copy); + return; + } + sun4v_log_error(regs, &local_copy, cpu, KERN_ERR "RESUMABLE ERROR", &sun4v_resum_oflow_cnt); |