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s390/unwind: introduce stack unwind API

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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>
This commit is contained in:
Martin Schwidefsky
2019-01-28 08:33:08 +01:00
parent 1c705ad5ef
commit 78c98f9074
16 changed files with 521 additions and 205 deletions
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22
arch/s390/oprofile/init.c
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@@ -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)