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>

1 files changed, 127 insertions, 0 deletions

diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
new file mode 100644
index 000000000000..d25459ff57fc
--- /dev/null
+++ b/arch/arm64/kernel/stacktrace.c
@@ -0,0 +1,127 @@
+/*
+ * Stack tracing support
+ *
+ * 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/kernel.h>
+#include <linux/export.h>
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+
+#include <asm/stacktrace.h>
+
+/*
+ * AArch64 PCS assigns the frame pointer to x29.
+ *
+ * A simple function prologue looks like this:
+ *      sub     sp, sp, #0x10
+ *      stp     x29, x30, [sp]
+ *      mov     x29, sp
+ *
+ * A simple function epilogue looks like this:
+ *      mov     sp, x29
+ *      ldp     x29, x30, [sp]
+ *      add     sp, sp, #0x10
+ */
+int unwind_frame(struct stackframe *frame)
+{
+        unsigned long high, low;
+        unsigned long fp = frame->fp;
+
+        low  = frame->sp;
+        high = ALIGN(low, THREAD_SIZE);
+
+        if (fp < low || fp > high || fp & 0xf)
+                return -EINVAL;
+
+        frame->sp = fp + 0x10;
+        frame->fp = *(unsigned long *)(fp);
+        frame->pc = *(unsigned long *)(fp + 8);
+
+        return 0;
+}
+
+void notrace walk_stackframe(struct stackframe *frame,
+                     int (*fn)(struct stackframe *, void *), void *data)
+{
+        while (1) {
+                int ret;
+
+                if (fn(frame, data))
+                        break;
+                ret = unwind_frame(frame);
+                if (ret < 0)
+                        break;
+        }
+}
+EXPORT_SYMBOL(walk_stackframe);
+
+#ifdef CONFIG_STACKTRACE
+struct stack_trace_data {
+        struct stack_trace *trace;
+        unsigned int no_sched_functions;
+        unsigned int skip;
+};
+
+static int save_trace(struct stackframe *frame, void *d)
+{
+        struct stack_trace_data *data = d;
+        struct stack_trace *trace = data->trace;
+        unsigned long addr = frame->pc;
+
+        if (data->no_sched_functions && in_sched_functions(addr))
+                return 0;
+        if (data->skip) {
+                data->skip--;
+                return 0;
+        }
+
+        trace->entries[trace->nr_entries++] = addr;
+
+        return trace->nr_entries >= trace->max_entries;
+}
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+        struct stack_trace_data data;
+        struct stackframe frame;
+
+        data.trace = trace;
+        data.skip = trace->skip;
+
+        if (tsk != current) {
+                data.no_sched_functions = 1;
+                frame.fp = thread_saved_fp(tsk);
+                frame.sp = thread_saved_sp(tsk);
+                frame.pc = thread_saved_pc(tsk);
+        } else {
+                register unsigned long current_sp asm("sp");
+                data.no_sched_functions = 0;
+                frame.fp = (unsigned long)__builtin_frame_address(0);
+                frame.sp = current_sp;
+                frame.pc = (unsigned long)save_stack_trace_tsk;
+        }
+
+        walk_stackframe(&frame, save_trace, &data);
+        if (trace->nr_entries < trace->max_entries)
+                trace->entries[trace->nr_entries++] = ULONG_MAX;
+}
+
+void save_stack_trace(struct stack_trace *trace)
+{
+        save_stack_trace_tsk(current, trace);
+}
+EXPORT_SYMBOL_GPL(save_stack_trace);
+#endif