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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2019-01-28 08:33:08 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2019-05-02 13:54:11 +0200
commit78c98f9074135d3dab4e39544e0a537f92388fce (patch)
tree6f6d96e8e0911fe2aa27ec89cca52d56d3ed6f7e /arch/s390/oprofile
parent1c705ad5efae9c712e763a47fbcc95b87b7347d2 (diff)
downloadlinux-78c98f9074135d3dab4e39544e0a537f92388fce.tar.bz2
s390/unwind: introduce stack unwind API
Rework the dump_trace() stack unwinder interface to support different unwinding algorithms. The new interface looks like this: struct unwind_state state; unwind_for_each_frame(&state, task, regs, start_stack) do_something(state.sp, state.ip, state.reliable); The unwind_bc.c file contains the implementation for the classic back-chain unwinder. One positive side effect of the new code is it now handles ftraced functions gracefully. It prints the real name of the return function instead of 'return_to_handler'. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/oprofile')
-rw-r--r--arch/s390/oprofile/init.c22
1 files changed, 8 insertions, 14 deletions
diff --git a/arch/s390/oprofile/init.c b/arch/s390/oprofile/init.c
index 43d9525c36fc..7441857df51b 100644
--- a/arch/s390/oprofile/init.c
+++ b/arch/s390/oprofile/init.c
@@ -13,23 +13,17 @@
#include <linux/oprofile.h>
#include <linux/init.h>
#include <asm/processor.h>
-
-static int __s390_backtrace(void *data, unsigned long address, int reliable)
-{
- unsigned int *depth = data;
-
- if (*depth == 0)
- return 1;
- (*depth)--;
- oprofile_add_trace(address);
- return 0;
-}
+#include <asm/unwind.h>
static void s390_backtrace(struct pt_regs *regs, unsigned int depth)
{
- if (user_mode(regs))
- return;
- dump_trace(__s390_backtrace, &depth, NULL, regs->gprs[15]);
+ struct unwind_state state;
+
+ unwind_for_each_frame(&state, current, regs, 0) {
+ if (depth-- == 0)
+ break;
+ oprofile_add_trace(state.ip);
+ }
}
int __init oprofile_arch_init(struct oprofile_operations *ops)