Merge branch 'linus' into stackprotector

Conflicts:
	arch/x86/include/asm/pda.h
	kernel/fork.c

1 files changed, 64 insertions, 0 deletions

diff --git a/arch/sparc/kernel/stacktrace.c b/arch/sparc/kernel/stacktrace.c
new file mode 100644
index 000000000000..acb12f673757
--- /dev/null
+++ b/arch/sparc/kernel/stacktrace.c
@@ -0,0 +1,64 @@
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/thread_info.h>
+#include <linux/module.h>
+#include <asm/ptrace.h>
+#include <asm/stacktrace.h>
+
+#include "kstack.h"
+
+static void __save_stack_trace(struct thread_info *tp,
+			       struct stack_trace *trace,
+			       bool skip_sched)
+{
+	unsigned long ksp, fp;
+
+	if (tp == current_thread_info()) {
+		stack_trace_flush();
+		__asm__ __volatile__("mov %%fp, %0" : "=r" (ksp));
+	} else {
+		ksp = tp->ksp;
+	}
+
+	fp = ksp + STACK_BIAS;
+	do {
+		struct sparc_stackf *sf;
+		struct pt_regs *regs;
+		unsigned long pc;
+
+		if (!kstack_valid(tp, fp))
+			break;
+
+		sf = (struct sparc_stackf *) fp;
+		regs = (struct pt_regs *) (sf + 1);
+
+		if (kstack_is_trap_frame(tp, regs)) {
+			if (!(regs->tstate & TSTATE_PRIV))
+				break;
+			pc = regs->tpc;
+			fp = regs->u_regs[UREG_I6] + STACK_BIAS;
+		} else {
+			pc = sf->callers_pc;
+			fp = (unsigned long)sf->fp + STACK_BIAS;
+		}
+
+		if (trace->skip > 0)
+			trace->skip--;
+		else if (!skip_sched || !in_sched_functions(pc))
+			trace->entries[trace->nr_entries++] = pc;
+	} while (trace->nr_entries < trace->max_entries);
+}
+
+void save_stack_trace(struct stack_trace *trace)
+{
+	__save_stack_trace(current_thread_info(), trace, false);
+}
+EXPORT_SYMBOL_GPL(save_stack_trace);
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+	struct thread_info *tp = task_thread_info(tsk);
+
+	__save_stack_trace(tp, trace, true);
+}
+EXPORT_SYMBOL_GPL(save_stack_trace_tsk);