![Heiko Carstens](/assets/img/avatar_default.png)
The exception-trace facility on x86 and other architectures prints traces to dmesg whenever a user space application crashes. s390 has such a feature since ages however it is called userprocess_debug and is enabled differently. This patch makes sure that whenever one of the two procfs files /proc/sys/kernel/userprocess_debug /proc/sys/debug/exception-trace is modified the contents of the second one changes as well. That way we keep backwards compatibilty but also support the same interface like other architectures do. Besides that the output of the traces is improved since it will now also contain the corresponding filename of the vma (when available) where the process caused a fault or trap. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
601 lines
16 KiB
C
601 lines
16 KiB
C
/*
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* arch/s390/mm/fault.c
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Hartmut Penner (hp@de.ibm.com)
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* Ulrich Weigand (uweigand@de.ibm.com)
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*
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* Derived from "arch/i386/mm/fault.c"
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* Copyright (C) 1995 Linus Torvalds
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*/
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#include <linux/perf_event.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/compat.h>
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#include <linux/smp.h>
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#include <linux/kdebug.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/module.h>
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#include <linux/hardirq.h>
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#include <linux/kprobes.h>
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#include <linux/uaccess.h>
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#include <linux/hugetlb.h>
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#include <asm/asm-offsets.h>
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#include <asm/system.h>
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#include <asm/pgtable.h>
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#include <asm/s390_ext.h>
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#include <asm/mmu_context.h>
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#include <asm/compat.h>
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#include "../kernel/entry.h"
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#ifndef CONFIG_64BIT
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#define __FAIL_ADDR_MASK 0x7ffff000
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#define __SUBCODE_MASK 0x0200
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#define __PF_RES_FIELD 0ULL
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#else /* CONFIG_64BIT */
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#define __FAIL_ADDR_MASK -4096L
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#define __SUBCODE_MASK 0x0600
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#define __PF_RES_FIELD 0x8000000000000000ULL
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#endif /* CONFIG_64BIT */
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#define VM_FAULT_BADCONTEXT 0x010000
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#define VM_FAULT_BADMAP 0x020000
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#define VM_FAULT_BADACCESS 0x040000
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static inline int notify_page_fault(struct pt_regs *regs)
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{
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int ret = 0;
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/* kprobe_running() needs smp_processor_id() */
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if (kprobes_built_in() && !user_mode(regs)) {
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preempt_disable();
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if (kprobe_running() && kprobe_fault_handler(regs, 14))
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ret = 1;
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preempt_enable();
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}
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return ret;
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}
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/*
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* Unlock any spinlocks which will prevent us from getting the
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* message out.
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*/
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void bust_spinlocks(int yes)
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{
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if (yes) {
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oops_in_progress = 1;
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} else {
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int loglevel_save = console_loglevel;
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console_unblank();
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oops_in_progress = 0;
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/*
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* OK, the message is on the console. Now we call printk()
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* without oops_in_progress set so that printk will give klogd
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* a poke. Hold onto your hats...
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*/
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console_loglevel = 15;
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printk(" ");
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console_loglevel = loglevel_save;
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}
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}
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/*
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* Returns the address space associated with the fault.
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* Returns 0 for kernel space and 1 for user space.
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*/
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static inline int user_space_fault(unsigned long trans_exc_code)
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{
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/*
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* The lowest two bits of the translation exception
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* identification indicate which paging table was used.
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*/
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trans_exc_code &= 3;
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if (trans_exc_code == 2)
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/* Access via secondary space, set_fs setting decides */
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return current->thread.mm_segment.ar4;
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if (user_mode == HOME_SPACE_MODE)
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/* User space if the access has been done via home space. */
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return trans_exc_code == 3;
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/*
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* If the user space is not the home space the kernel runs in home
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* space. Access via secondary space has already been covered,
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* access via primary space or access register is from user space
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* and access via home space is from the kernel.
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*/
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return trans_exc_code != 3;
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}
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static inline void report_user_fault(struct pt_regs *regs, long int_code,
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int signr, unsigned long address)
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{
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if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
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return;
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if (!unhandled_signal(current, signr))
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return;
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if (!printk_ratelimit())
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return;
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printk("User process fault: interruption code 0x%lX ", int_code);
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print_vma_addr(KERN_CONT "in ", regs->psw.addr & PSW_ADDR_INSN);
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printk("\n");
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printk("failing address: %lX\n", address);
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show_regs(regs);
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}
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/*
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* Send SIGSEGV to task. This is an external routine
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* to keep the stack usage of do_page_fault small.
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*/
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static noinline void do_sigsegv(struct pt_regs *regs, long int_code,
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int si_code, unsigned long trans_exc_code)
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{
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struct siginfo si;
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unsigned long address;
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address = trans_exc_code & __FAIL_ADDR_MASK;
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current->thread.prot_addr = address;
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current->thread.trap_no = int_code;
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report_user_fault(regs, int_code, SIGSEGV, address);
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si.si_signo = SIGSEGV;
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si.si_code = si_code;
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si.si_addr = (void __user *) address;
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force_sig_info(SIGSEGV, &si, current);
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}
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static noinline void do_no_context(struct pt_regs *regs, long int_code,
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unsigned long trans_exc_code)
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{
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const struct exception_table_entry *fixup;
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unsigned long address;
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/* Are we prepared to handle this kernel fault? */
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fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
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if (fixup) {
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regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
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return;
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}
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/*
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* Oops. The kernel tried to access some bad page. We'll have to
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* terminate things with extreme prejudice.
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*/
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address = trans_exc_code & __FAIL_ADDR_MASK;
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if (!user_space_fault(trans_exc_code))
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printk(KERN_ALERT "Unable to handle kernel pointer dereference"
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" at virtual kernel address %p\n", (void *)address);
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else
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printk(KERN_ALERT "Unable to handle kernel paging request"
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" at virtual user address %p\n", (void *)address);
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die("Oops", regs, int_code);
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do_exit(SIGKILL);
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}
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static noinline void do_low_address(struct pt_regs *regs, long int_code,
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unsigned long trans_exc_code)
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{
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/* Low-address protection hit in kernel mode means
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NULL pointer write access in kernel mode. */
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if (regs->psw.mask & PSW_MASK_PSTATE) {
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/* Low-address protection hit in user mode 'cannot happen'. */
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die ("Low-address protection", regs, int_code);
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do_exit(SIGKILL);
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}
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do_no_context(regs, int_code, trans_exc_code);
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}
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static noinline void do_sigbus(struct pt_regs *regs, long int_code,
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unsigned long trans_exc_code)
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{
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struct task_struct *tsk = current;
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/*
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* Send a sigbus, regardless of whether we were in kernel
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* or user mode.
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*/
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tsk->thread.prot_addr = trans_exc_code & __FAIL_ADDR_MASK;
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tsk->thread.trap_no = int_code;
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force_sig(SIGBUS, tsk);
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}
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#ifdef CONFIG_S390_EXEC_PROTECT
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static noinline int signal_return(struct pt_regs *regs, long int_code,
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unsigned long trans_exc_code)
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{
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u16 instruction;
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int rc;
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rc = __get_user(instruction, (u16 __user *) regs->psw.addr);
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if (!rc && instruction == 0x0a77) {
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clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
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if (is_compat_task())
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sys32_sigreturn();
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else
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sys_sigreturn();
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} else if (!rc && instruction == 0x0aad) {
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clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
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if (is_compat_task())
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sys32_rt_sigreturn();
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else
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sys_rt_sigreturn();
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} else
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do_sigsegv(regs, int_code, SEGV_MAPERR, trans_exc_code);
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return 0;
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}
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#endif /* CONFIG_S390_EXEC_PROTECT */
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static noinline void do_fault_error(struct pt_regs *regs, long int_code,
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unsigned long trans_exc_code, int fault)
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{
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int si_code;
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switch (fault) {
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case VM_FAULT_BADACCESS:
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#ifdef CONFIG_S390_EXEC_PROTECT
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if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_SECONDARY &&
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(trans_exc_code & 3) == 0) {
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signal_return(regs, int_code, trans_exc_code);
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break;
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}
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#endif /* CONFIG_S390_EXEC_PROTECT */
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case VM_FAULT_BADMAP:
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/* Bad memory access. Check if it is kernel or user space. */
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if (regs->psw.mask & PSW_MASK_PSTATE) {
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/* User mode accesses just cause a SIGSEGV */
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si_code = (fault == VM_FAULT_BADMAP) ?
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SEGV_MAPERR : SEGV_ACCERR;
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do_sigsegv(regs, int_code, si_code, trans_exc_code);
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return;
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}
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case VM_FAULT_BADCONTEXT:
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do_no_context(regs, int_code, trans_exc_code);
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break;
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default: /* fault & VM_FAULT_ERROR */
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if (fault & VM_FAULT_OOM)
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pagefault_out_of_memory();
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else if (fault & VM_FAULT_SIGBUS) {
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do_sigbus(regs, int_code, trans_exc_code);
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/* Kernel mode? Handle exceptions or die */
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if (!(regs->psw.mask & PSW_MASK_PSTATE))
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do_no_context(regs, int_code, trans_exc_code);
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} else
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BUG();
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break;
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}
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}
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/*
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* This routine handles page faults. It determines the address,
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* and the problem, and then passes it off to one of the appropriate
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* routines.
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*
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* interruption code (int_code):
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* 04 Protection -> Write-Protection (suprression)
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* 10 Segment translation -> Not present (nullification)
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* 11 Page translation -> Not present (nullification)
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* 3b Region third trans. -> Not present (nullification)
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*/
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static inline int do_exception(struct pt_regs *regs, int access,
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unsigned long trans_exc_code)
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{
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struct task_struct *tsk;
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struct mm_struct *mm;
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struct vm_area_struct *vma;
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unsigned long address;
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int fault;
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if (notify_page_fault(regs))
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return 0;
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tsk = current;
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mm = tsk->mm;
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/*
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* Verify that the fault happened in user space, that
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* we are not in an interrupt and that there is a
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* user context.
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*/
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fault = VM_FAULT_BADCONTEXT;
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if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
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goto out;
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address = trans_exc_code & __FAIL_ADDR_MASK;
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/*
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* When we get here, the fault happened in the current
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* task's user address space, so we can switch on the
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* interrupts again and then search the VMAs
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*/
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local_irq_enable();
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, address);
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down_read(&mm->mmap_sem);
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fault = VM_FAULT_BADMAP;
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vma = find_vma(mm, address);
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if (!vma)
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goto out_up;
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if (unlikely(vma->vm_start > address)) {
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if (!(vma->vm_flags & VM_GROWSDOWN))
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goto out_up;
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if (expand_stack(vma, address))
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goto out_up;
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}
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/*
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* Ok, we have a good vm_area for this memory access, so
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* we can handle it..
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*/
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fault = VM_FAULT_BADACCESS;
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if (unlikely(!(vma->vm_flags & access)))
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goto out_up;
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if (is_vm_hugetlb_page(vma))
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address &= HPAGE_MASK;
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/*
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* If for any reason at all we couldn't handle the fault,
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* make sure we exit gracefully rather than endlessly redo
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* the fault.
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*/
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fault = handle_mm_fault(mm, vma, address,
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(access == VM_WRITE) ? FAULT_FLAG_WRITE : 0);
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if (unlikely(fault & VM_FAULT_ERROR))
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goto out_up;
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if (fault & VM_FAULT_MAJOR) {
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tsk->maj_flt++;
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, 0,
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regs, address);
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} else {
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tsk->min_flt++;
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, 0,
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regs, address);
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}
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/*
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* The instruction that caused the program check will
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* be repeated. Don't signal single step via SIGTRAP.
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*/
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clear_tsk_thread_flag(tsk, TIF_SINGLE_STEP);
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fault = 0;
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out_up:
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up_read(&mm->mmap_sem);
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out:
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return fault;
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}
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void __kprobes do_protection_exception(struct pt_regs *regs, long int_code)
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{
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unsigned long trans_exc_code = S390_lowcore.trans_exc_code;
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int fault;
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/* Protection exception is supressing, decrement psw address. */
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regs->psw.addr -= (int_code >> 16);
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/*
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* Check for low-address protection. This needs to be treated
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* as a special case because the translation exception code
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* field is not guaranteed to contain valid data in this case.
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*/
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if (unlikely(!(trans_exc_code & 4))) {
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do_low_address(regs, int_code, trans_exc_code);
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return;
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}
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fault = do_exception(regs, VM_WRITE, trans_exc_code);
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if (unlikely(fault))
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do_fault_error(regs, 4, trans_exc_code, fault);
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}
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void __kprobes do_dat_exception(struct pt_regs *regs, long int_code)
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{
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unsigned long trans_exc_code = S390_lowcore.trans_exc_code;
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int access, fault;
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access = VM_READ | VM_EXEC | VM_WRITE;
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#ifdef CONFIG_S390_EXEC_PROTECT
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if ((regs->psw.mask & PSW_MASK_ASC) == PSW_ASC_SECONDARY &&
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(trans_exc_code & 3) == 0)
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access = VM_EXEC;
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#endif
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fault = do_exception(regs, access, trans_exc_code);
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if (unlikely(fault))
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do_fault_error(regs, int_code & 255, trans_exc_code, fault);
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}
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#ifdef CONFIG_64BIT
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void __kprobes do_asce_exception(struct pt_regs *regs, long int_code)
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{
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unsigned long trans_exc_code = S390_lowcore.trans_exc_code;
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
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goto no_context;
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local_irq_enable();
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down_read(&mm->mmap_sem);
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vma = find_vma(mm, trans_exc_code & __FAIL_ADDR_MASK);
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up_read(&mm->mmap_sem);
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if (vma) {
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update_mm(mm, current);
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return;
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}
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/* User mode accesses just cause a SIGSEGV */
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if (regs->psw.mask & PSW_MASK_PSTATE) {
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do_sigsegv(regs, int_code, SEGV_MAPERR, trans_exc_code);
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return;
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}
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no_context:
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do_no_context(regs, int_code, trans_exc_code);
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}
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#endif
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int __handle_fault(unsigned long uaddr, unsigned long int_code, int write_user)
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{
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struct pt_regs regs;
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int access, fault;
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regs.psw.mask = psw_kernel_bits;
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if (!irqs_disabled())
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regs.psw.mask |= PSW_MASK_IO | PSW_MASK_EXT;
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regs.psw.addr = (unsigned long) __builtin_return_address(0);
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regs.psw.addr |= PSW_ADDR_AMODE;
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uaddr &= PAGE_MASK;
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access = write_user ? VM_WRITE : VM_READ;
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fault = do_exception(®s, access, uaddr | 2);
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if (unlikely(fault)) {
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if (fault & VM_FAULT_OOM) {
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pagefault_out_of_memory();
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fault = 0;
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} else if (fault & VM_FAULT_SIGBUS)
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do_sigbus(®s, int_code, uaddr);
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}
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return fault ? -EFAULT : 0;
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}
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#ifdef CONFIG_PFAULT
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/*
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* 'pfault' pseudo page faults routines.
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*/
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static ext_int_info_t ext_int_pfault;
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static int pfault_disable = 0;
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static int __init nopfault(char *str)
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{
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pfault_disable = 1;
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return 1;
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}
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__setup("nopfault", nopfault);
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typedef struct {
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__u16 refdiagc;
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__u16 reffcode;
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__u16 refdwlen;
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__u16 refversn;
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__u64 refgaddr;
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__u64 refselmk;
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__u64 refcmpmk;
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__u64 reserved;
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} __attribute__ ((packed, aligned(8))) pfault_refbk_t;
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int pfault_init(void)
|
|
{
|
|
pfault_refbk_t refbk =
|
|
{ 0x258, 0, 5, 2, __LC_CURRENT, 1ULL << 48, 1ULL << 48,
|
|
__PF_RES_FIELD };
|
|
int rc;
|
|
|
|
if (!MACHINE_IS_VM || pfault_disable)
|
|
return -1;
|
|
asm volatile(
|
|
" diag %1,%0,0x258\n"
|
|
"0: j 2f\n"
|
|
"1: la %0,8\n"
|
|
"2:\n"
|
|
EX_TABLE(0b,1b)
|
|
: "=d" (rc) : "a" (&refbk), "m" (refbk) : "cc");
|
|
__ctl_set_bit(0, 9);
|
|
return rc;
|
|
}
|
|
|
|
void pfault_fini(void)
|
|
{
|
|
pfault_refbk_t refbk =
|
|
{ 0x258, 1, 5, 2, 0ULL, 0ULL, 0ULL, 0ULL };
|
|
|
|
if (!MACHINE_IS_VM || pfault_disable)
|
|
return;
|
|
__ctl_clear_bit(0,9);
|
|
asm volatile(
|
|
" diag %0,0,0x258\n"
|
|
"0:\n"
|
|
EX_TABLE(0b,0b)
|
|
: : "a" (&refbk), "m" (refbk) : "cc");
|
|
}
|
|
|
|
static void pfault_interrupt(__u16 int_code)
|
|
{
|
|
struct task_struct *tsk;
|
|
__u16 subcode;
|
|
|
|
/*
|
|
* Get the external interruption subcode & pfault
|
|
* initial/completion signal bit. VM stores this
|
|
* in the 'cpu address' field associated with the
|
|
* external interrupt.
|
|
*/
|
|
subcode = S390_lowcore.cpu_addr;
|
|
if ((subcode & 0xff00) != __SUBCODE_MASK)
|
|
return;
|
|
|
|
/*
|
|
* Get the token (= address of the task structure of the affected task).
|
|
*/
|
|
tsk = *(struct task_struct **) __LC_PFAULT_INTPARM;
|
|
|
|
if (subcode & 0x0080) {
|
|
/* signal bit is set -> a page has been swapped in by VM */
|
|
if (xchg(&tsk->thread.pfault_wait, -1) != 0) {
|
|
/* Initial interrupt was faster than the completion
|
|
* interrupt. pfault_wait is valid. Set pfault_wait
|
|
* back to zero and wake up the process. This can
|
|
* safely be done because the task is still sleeping
|
|
* and can't produce new pfaults. */
|
|
tsk->thread.pfault_wait = 0;
|
|
wake_up_process(tsk);
|
|
put_task_struct(tsk);
|
|
}
|
|
} else {
|
|
/* signal bit not set -> a real page is missing. */
|
|
get_task_struct(tsk);
|
|
set_task_state(tsk, TASK_UNINTERRUPTIBLE);
|
|
if (xchg(&tsk->thread.pfault_wait, 1) != 0) {
|
|
/* Completion interrupt was faster than the initial
|
|
* interrupt (swapped in a -1 for pfault_wait). Set
|
|
* pfault_wait back to zero and exit. This can be
|
|
* done safely because tsk is running in kernel
|
|
* mode and can't produce new pfaults. */
|
|
tsk->thread.pfault_wait = 0;
|
|
set_task_state(tsk, TASK_RUNNING);
|
|
put_task_struct(tsk);
|
|
} else
|
|
set_tsk_need_resched(tsk);
|
|
}
|
|
}
|
|
|
|
void __init pfault_irq_init(void)
|
|
{
|
|
if (!MACHINE_IS_VM)
|
|
return;
|
|
|
|
/*
|
|
* Try to get pfault pseudo page faults going.
|
|
*/
|
|
if (register_early_external_interrupt(0x2603, pfault_interrupt,
|
|
&ext_int_pfault) != 0)
|
|
panic("Couldn't request external interrupt 0x2603");
|
|
|
|
if (pfault_init() == 0)
|
|
return;
|
|
|
|
/* Tough luck, no pfault. */
|
|
pfault_disable = 1;
|
|
unregister_early_external_interrupt(0x2603, pfault_interrupt,
|
|
&ext_int_pfault);
|
|
}
|
|
#endif
|