#ifndef _ASM_S390_STACKTRACE_H
#define _ASM_S390_STACKTRACE_H
+#include <linux/stacktrace.h>
#include <linux/uaccess.h>
#include <linux/ptrace.h>
unsigned long empty2[4];
};
+struct perf_callchain_entry_ctx;
+
+void arch_stack_walk_user_common(stack_trace_consume_fn consume_entry, void *cookie,
+ struct perf_callchain_entry_ctx *entry,
+ const struct pt_regs *regs, bool perf);
+
enum stack_type {
STACK_TYPE_UNKNOWN,
STACK_TYPE_TASK,
void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
struct pt_regs *regs)
{
- struct stack_frame_user __user *sf;
- unsigned long ip, sp;
- bool first = true;
-
- if (is_compat_task())
- return;
- perf_callchain_store(entry, instruction_pointer(regs));
- sf = (void __user *)user_stack_pointer(regs);
- pagefault_disable();
- while (entry->nr < entry->max_stack) {
- if (__get_user(sp, &sf->back_chain))
- break;
- if (__get_user(ip, &sf->gprs[8]))
- break;
- if (ip & 0x1) {
- /*
- * If the instruction address is invalid, and this
- * is the first stack frame, assume r14 has not
- * been written to the stack yet. Otherwise exit.
- */
- if (first && !(regs->gprs[14] & 0x1))
- ip = regs->gprs[14];
- else
- break;
- }
- perf_callchain_store(entry, ip);
- /* Sanity check: ABI requires SP to be aligned 8 bytes. */
- if (!sp || sp & 0x7)
- break;
- sf = (void __user *)sp;
- first = false;
- }
- pagefault_enable();
+ arch_stack_walk_user_common(NULL, NULL, entry, regs, true);
}
/* Perf definitions for PMU event attributes in sysfs */
* Copyright IBM Corp. 2006
*/
+#include <linux/perf_event.h>
#include <linux/stacktrace.h>
#include <linux/uaccess.h>
#include <linux/compat.h>
return 0;
}
-void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie,
- const struct pt_regs *regs)
+static inline bool store_ip(stack_trace_consume_fn consume_entry, void *cookie,
+ struct perf_callchain_entry_ctx *entry, bool perf,
+ unsigned long ip)
+{
+#ifdef CONFIG_PERF_EVENTS
+ if (perf) {
+ if (perf_callchain_store(entry, ip))
+ return false;
+ return true;
+ }
+#endif
+ return consume_entry(cookie, ip);
+}
+
+void arch_stack_walk_user_common(stack_trace_consume_fn consume_entry, void *cookie,
+ struct perf_callchain_entry_ctx *entry,
+ const struct pt_regs *regs, bool perf)
{
struct stack_frame_user __user *sf;
unsigned long ip, sp;
if (is_compat_task())
return;
- if (!consume_entry(cookie, instruction_pointer(regs)))
+ ip = instruction_pointer(regs);
+ if (!store_ip(consume_entry, cookie, entry, perf, ip))
return;
sf = (void __user *)user_stack_pointer(regs);
pagefault_disable();
else
break;
}
- if (!consume_entry(cookie, ip))
- break;
+ if (!store_ip(consume_entry, cookie, entry, perf, ip))
+ return;
/* Sanity check: ABI requires SP to be aligned 8 bytes. */
if (!sp || sp & 0x7)
break;
pagefault_enable();
}
+void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie,
+ const struct pt_regs *regs)
+{
+ arch_stack_walk_user_common(consume_entry, cookie, NULL, regs, false);
+}
+
unsigned long return_address(unsigned int n)
{
struct unwind_state state;