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authorCatalin Marinas <catalin.marinas@arm.com>2012-03-05 11:49:27 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2012-09-17 10:24:46 +0100
commit60ffc30d5652810dd34ea2eec41504222f5d5791 (patch)
treeb1d8364b8a86df0327b2f6318c4f59e973695337 /arch/arm64/kernel/traps.c
parent9703d9d7f77ce129621f7d80a844822e2daa7008 (diff)
downloadlinux-linaro-stable-60ffc30d5652810dd34ea2eec41504222f5d5791.tar.gz
arm64: Exception handling
The patch contains the exception entry code (kernel/entry.S), pt_regs structure and related accessors, undefined instruction trapping and stack tracing. AArch64 Linux kernel (including kernel threads) runs in EL1 mode using the SP1 stack. The vectors don't have a fixed address, only alignment (2^11) requirements. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm64/kernel/traps.c')
-rw-r--r--arch/arm64/kernel/traps.c348
1 files changed, 348 insertions, 0 deletions
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
new file mode 100644
index 000000000000..3883f842434f
--- /dev/null
+++ b/arch/arm64/kernel/traps.c
@@ -0,0 +1,348 @@
+/*
+ * Based on arch/arm/kernel/traps.c
+ *
+ * Copyright (C) 1995-2009 Russell King
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/signal.h>
+#include <linux/personality.h>
+#include <linux/kallsyms.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/hardirq.h>
+#include <linux/kdebug.h>
+#include <linux/module.h>
+#include <linux/kexec.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/syscalls.h>
+
+#include <asm/atomic.h>
+#include <asm/traps.h>
+#include <asm/stacktrace.h>
+#include <asm/exception.h>
+#include <asm/system_misc.h>
+
+static const char *handler[]= {
+ "Synchronous Abort",
+ "IRQ",
+ "FIQ",
+ "Error"
+};
+
+int show_unhandled_signals = 1;
+
+/*
+ * Dump out the contents of some memory nicely...
+ */
+static void dump_mem(const char *lvl, const char *str, unsigned long bottom,
+ unsigned long top)
+{
+ unsigned long first;
+ mm_segment_t fs;
+ int i;
+
+ /*
+ * We need to switch to kernel mode so that we can use __get_user
+ * to safely read from kernel space. Note that we now dump the
+ * code first, just in case the backtrace kills us.
+ */
+ fs = get_fs();
+ set_fs(KERNEL_DS);
+
+ printk("%s%s(0x%016lx to 0x%016lx)\n", lvl, str, bottom, top);
+
+ for (first = bottom & ~31; first < top; first += 32) {
+ unsigned long p;
+ char str[sizeof(" 12345678") * 8 + 1];
+
+ memset(str, ' ', sizeof(str));
+ str[sizeof(str) - 1] = '\0';
+
+ for (p = first, i = 0; i < 8 && p < top; i++, p += 4) {
+ if (p >= bottom && p < top) {
+ unsigned int val;
+ if (__get_user(val, (unsigned int *)p) == 0)
+ sprintf(str + i * 9, " %08x", val);
+ else
+ sprintf(str + i * 9, " ????????");
+ }
+ }
+ printk("%s%04lx:%s\n", lvl, first & 0xffff, str);
+ }
+
+ set_fs(fs);
+}
+
+static void dump_backtrace_entry(unsigned long where, unsigned long stack)
+{
+ print_ip_sym(where);
+ if (in_exception_text(where))
+ dump_mem("", "Exception stack", stack,
+ stack + sizeof(struct pt_regs));
+}
+
+static void dump_instr(const char *lvl, struct pt_regs *regs)
+{
+ unsigned long addr = instruction_pointer(regs);
+ mm_segment_t fs;
+ char str[sizeof("00000000 ") * 5 + 2 + 1], *p = str;
+ int i;
+
+ /*
+ * We need to switch to kernel mode so that we can use __get_user
+ * to safely read from kernel space. Note that we now dump the
+ * code first, just in case the backtrace kills us.
+ */
+ fs = get_fs();
+ set_fs(KERNEL_DS);
+
+ for (i = -4; i < 1; i++) {
+ unsigned int val, bad;
+
+ bad = __get_user(val, &((u32 *)addr)[i]);
+
+ if (!bad)
+ p += sprintf(p, i == 0 ? "(%08x) " : "%08x ", val);
+ else {
+ p += sprintf(p, "bad PC value");
+ break;
+ }
+ }
+ printk("%sCode: %s\n", lvl, str);
+
+ set_fs(fs);
+}
+
+static void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk)
+{
+ struct stackframe frame;
+ const register unsigned long current_sp asm ("sp");
+
+ pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
+
+ if (!tsk)
+ tsk = current;
+
+ if (regs) {
+ frame.fp = regs->regs[29];
+ frame.sp = regs->sp;
+ frame.pc = regs->pc;
+ } else if (tsk == current) {
+ frame.fp = (unsigned long)__builtin_frame_address(0);
+ frame.sp = current_sp;
+ frame.pc = (unsigned long)dump_backtrace;
+ } else {
+ /*
+ * task blocked in __switch_to
+ */
+ frame.fp = thread_saved_fp(tsk);
+ frame.sp = thread_saved_sp(tsk);
+ frame.pc = thread_saved_pc(tsk);
+ }
+
+ printk("Call trace:\n");
+ while (1) {
+ unsigned long where = frame.pc;
+ int ret;
+
+ ret = unwind_frame(&frame);
+ if (ret < 0)
+ break;
+ dump_backtrace_entry(where, frame.sp);
+ }
+}
+
+void dump_stack(void)
+{
+ dump_backtrace(NULL, NULL);
+}
+
+EXPORT_SYMBOL(dump_stack);
+
+void show_stack(struct task_struct *tsk, unsigned long *sp)
+{
+ dump_backtrace(NULL, tsk);
+ barrier();
+}
+
+#ifdef CONFIG_PREEMPT
+#define S_PREEMPT " PREEMPT"
+#else
+#define S_PREEMPT ""
+#endif
+#ifdef CONFIG_SMP
+#define S_SMP " SMP"
+#else
+#define S_SMP ""
+#endif
+
+static int __die(const char *str, int err, struct thread_info *thread,
+ struct pt_regs *regs)
+{
+ struct task_struct *tsk = thread->task;
+ static int die_counter;
+ int ret;
+
+ pr_emerg("Internal error: %s: %x [#%d]" S_PREEMPT S_SMP "\n",
+ str, err, ++die_counter);
+
+ /* trap and error numbers are mostly meaningless on ARM */
+ ret = notify_die(DIE_OOPS, str, regs, err, 0, SIGSEGV);
+ if (ret == NOTIFY_STOP)
+ return ret;
+
+ print_modules();
+ __show_regs(regs);
+ pr_emerg("Process %.*s (pid: %d, stack limit = 0x%p)\n",
+ TASK_COMM_LEN, tsk->comm, task_pid_nr(tsk), thread + 1);
+
+ if (!user_mode(regs) || in_interrupt()) {
+ dump_mem(KERN_EMERG, "Stack: ", regs->sp,
+ THREAD_SIZE + (unsigned long)task_stack_page(tsk));
+ dump_backtrace(regs, tsk);
+ dump_instr(KERN_EMERG, regs);
+ }
+
+ return ret;
+}
+
+static DEFINE_RAW_SPINLOCK(die_lock);
+
+/*
+ * This function is protected against re-entrancy.
+ */
+void die(const char *str, struct pt_regs *regs, int err)
+{
+ struct thread_info *thread = current_thread_info();
+ int ret;
+
+ oops_enter();
+
+ raw_spin_lock_irq(&die_lock);
+ console_verbose();
+ bust_spinlocks(1);
+ ret = __die(str, err, thread, regs);
+
+ if (regs && kexec_should_crash(thread->task))
+ crash_kexec(regs);
+
+ bust_spinlocks(0);
+ add_taint(TAINT_DIE);
+ raw_spin_unlock_irq(&die_lock);
+ oops_exit();
+
+ if (in_interrupt())
+ panic("Fatal exception in interrupt");
+ if (panic_on_oops)
+ panic("Fatal exception");
+ if (ret != NOTIFY_STOP)
+ do_exit(SIGSEGV);
+}
+
+void arm64_notify_die(const char *str, struct pt_regs *regs,
+ struct siginfo *info, int err)
+{
+ if (user_mode(regs))
+ force_sig_info(info->si_signo, info, current);
+ else
+ die(str, regs, err);
+}
+
+asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
+{
+ siginfo_t info;
+ void __user *pc = (void __user *)instruction_pointer(regs);
+
+#ifdef CONFIG_COMPAT
+ /* check for AArch32 breakpoint instructions */
+ if (compat_user_mode(regs) && aarch32_break_trap(regs) == 0)
+ return;
+#endif
+
+ if (show_unhandled_signals) {
+ pr_info("%s[%d]: undefined instruction: pc=%p\n",
+ current->comm, task_pid_nr(current), pc);
+ dump_instr(KERN_INFO, regs);
+ }
+
+ info.si_signo = SIGILL;
+ info.si_errno = 0;
+ info.si_code = ILL_ILLOPC;
+ info.si_addr = pc;
+
+ arm64_notify_die("Oops - undefined instruction", regs, &info, 0);
+}
+
+long compat_arm_syscall(struct pt_regs *regs);
+
+asmlinkage long do_ni_syscall(struct pt_regs *regs)
+{
+#ifdef CONFIG_COMPAT
+ long ret;
+ if (is_compat_task()) {
+ ret = compat_arm_syscall(regs);
+ if (ret != -ENOSYS)
+ return ret;
+ }
+#endif
+
+ if (show_unhandled_signals) {
+ pr_info("%s[%d]: syscall %d\n", current->comm,
+ task_pid_nr(current), (int)regs->syscallno);
+ dump_instr("", regs);
+ if (user_mode(regs))
+ __show_regs(regs);
+ }
+
+ return sys_ni_syscall();
+}
+
+/*
+ * bad_mode handles the impossible case in the exception vector.
+ */
+asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr)
+{
+ console_verbose();
+
+ pr_crit("Bad mode in %s handler detected, code 0x%08x\n",
+ handler[reason], esr);
+
+ die("Oops - bad mode", regs, 0);
+ local_irq_disable();
+ panic("bad mode");
+}
+
+void __pte_error(const char *file, int line, unsigned long val)
+{
+ printk("%s:%d: bad pte %016lx.\n", file, line, val);
+}
+
+void __pmd_error(const char *file, int line, unsigned long val)
+{
+ printk("%s:%d: bad pmd %016lx.\n", file, line, val);
+}
+
+void __pgd_error(const char *file, int line, unsigned long val)
+{
+ printk("%s:%d: bad pgd %016lx.\n", file, line, val);
+}
+
+void __init trap_init(void)
+{
+ return;
+}