#include <linux/compiler.h>
#include <linux/types.h>
#include <unistd.h>
#include "tests.h"
#include "debug.h"
#include "machine.h"
#include "event.h"
#include "unwind.h"
#include "perf_regs.h"
#include "map.h"
#include "thread.h"
#include "callchain.h"

#if defined (__x86_64__) || defined (__i386__) || defined (__powerpc__)
#include "arch-tests.h"
#endif

/* For bsearch. We try to unwind functions in shared object. */
#include <stdlib.h>

static int mmap_handler(struct perf_tool *tool __maybe_unused,
			union perf_event *event,
			struct perf_sample *sample,
			struct machine *machine)
{
	return machine__process_mmap2_event(machine, event, sample);
}

static int init_live_machine(struct machine *machine)
{
	union perf_event event;
	pid_t pid = getpid();

	return perf_event__synthesize_mmap_events(NULL, &event, pid, pid,
						  mmap_handler, machine, true, 500);
}

#define MAX_STACK 8

static int unwind_entry(struct unwind_entry *entry, void *arg)
{
	unsigned long *cnt = (unsigned long *) arg;
	char *symbol = entry->sym ? entry->sym->name : NULL;
	static const char *funcs[MAX_STACK] = {
		"test__arch_unwind_sample",
		"unwind_thread",
		"compare",
		"bsearch",
		"krava_3",
		"krava_2",
		"krava_1",
		"test__dwarf_unwind"
	};
	/*
	 * The funcs[MAX_STACK] array index, based on the
	 * callchain order setup.
	 */
	int idx = callchain_param.order == ORDER_CALLER ?
		  MAX_STACK - *cnt - 1 : *cnt;

	if (*cnt >= MAX_STACK) {
		pr_debug("failed: crossed the max stack value %d\n", MAX_STACK);
		return -1;
	}

	if (!symbol) {
		pr_debug("failed: got unresolved address 0x%" PRIx64 "\n",
			 entry->ip);
		return -1;
	}

	(*cnt)++;
	pr_debug("got: %s 0x%" PRIx64 ", expecting %s\n",
		 symbol, entry->ip, funcs[idx]);
	return strcmp((const char *) symbol, funcs[idx]);
}

__attribute__ ((noinline))
static int unwind_thread(struct thread *thread)
{
	struct perf_sample sample;
	unsigned long cnt = 0;
	int err = -1;

	memset(&sample, 0, sizeof(sample));

	if (test__arch_unwind_sample(&sample, thread)) {
		pr_debug("failed to get unwind sample\n");
		goto out;
	}

	err = unwind__get_entries(unwind_entry, &cnt, thread,
				  &sample, MAX_STACK);
	if (err)
		pr_debug("unwind failed\n");
	else if (cnt != MAX_STACK) {
		pr_debug("got wrong number of stack entries %lu != %d\n",
			 cnt, MAX_STACK);
		err = -1;
	}

 out:
	free(sample.user_stack.data);
	free(sample.user_regs.regs);
	return err;
}

static int global_unwind_retval = -INT_MAX;

__attribute__ ((noinline))
static int compare(void *p1, void *p2)
{
	/* Any possible value should be 'thread' */
	struct thread *thread = *(struct thread **)p1;

	if (global_unwind_retval == -INT_MAX) {
		/* Call unwinder twice for both callchain orders. */
		callchain_param.order = ORDER_CALLER;

		global_unwind_retval = unwind_thread(thread);
		if (!global_unwind_retval) {
			callchain_param.order = ORDER_CALLEE;
			global_unwind_retval = unwind_thread(thread);
		}
	}

	return p1 - p2;
}

__attribute__ ((noinline))
static int krava_3(struct thread *thread)
{
	struct thread *array[2] = {thread, thread};
	void *fp = &bsearch;
	/*
	 * make _bsearch a volatile function pointer to
	 * prevent potential optimization, which may expand
	 * bsearch and call compare directly from this function,
	 * instead of libc shared object.
	 */
	void *(*volatile _bsearch)(void *, void *, size_t,
			size_t, int (*)(void *, void *));

	_bsearch = fp;
	_bsearch(array, &thread, 2, sizeof(struct thread **), compare);
	return global_unwind_retval;
}

__attribute__ ((noinline))
static int krava_2(struct thread *thread)
{
	return krava_3(thread);
}

__attribute__ ((noinline))
static int krava_1(struct thread *thread)
{
	return krava_2(thread);
}

int test__dwarf_unwind(int subtest __maybe_unused)
{
	struct machine *machine;
	struct thread *thread;
	int err = -1;

	machine = machine__new_host();
	if (!machine) {
		pr_err("Could not get machine\n");
		return -1;
	}

	if (machine__create_kernel_maps(machine)) {
		pr_err("Failed to create kernel maps\n");
		return -1;
	}

	callchain_param.record_mode = CALLCHAIN_DWARF;

	if (init_live_machine(machine)) {
		pr_err("Could not init machine\n");
		goto out;
	}

	if (verbose > 1)
		machine__fprintf(machine, stderr);

	thread = machine__find_thread(machine, getpid(), getpid());
	if (!thread) {
		pr_err("Could not get thread\n");
		goto out;
	}

	err = krava_1(thread);
	thread__put(thread);

 out:
	machine__delete_threads(machine);
	machine__delete(machine);
	return err;
}
></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Liam R. Howlett &lt;Liam.Howlett@Oracle.com&gt;</td><td class='right'>2017-01-17 10:59:03 -0500</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-30 14:27:54 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/atmel/ac97c.h?h=nds-private-remove&amp;id=047487241ff59374fded8c477f21453681f5995c'>047487241ff59374fded8c477f21453681f5995c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/atmel/ac97c.h?id=047487241ff59374fded8c477f21453681f5995c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=047487241ff59374fded8c477f21453681f5995c'>1c2616bd373ce5ea28aac2a53e32f5b5834901ce</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/atmel/ac97c.h?h=nds-private-remove&amp;id=047487241ff59374fded8c477f21453681f5995c'>sound/atmel/ac97c.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/atmel/ac97c.h?h=nds-private-remove&amp;id=7a7dc961a28b965a0d0303c2e989df17b411708b'>7a7dc961a28b965a0d0303c2e989df17b411708b</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/atmel/ac97c.h?h=nds-private-remove&amp;id=047487241ff59374fded8c477f21453681f5995c&amp;id2=7a7dc961a28b965a0d0303c2e989df17b411708b'>diff</a>)</td></tr></table>
<div class='commit-subject'>sparc64: Handle PIO &amp; MEM non-resumable errors.</div><div class='commit-msg'>User processes trying to access an invalid memory address via PIO will
receive a SIGBUS signal instead of causing a panic.  Memory errors will
receive a SIGKILL since a SIGBUS may result in a coredump which may
attempt to repeat the faulting access.

Signed-off-by: Liam R. Howlett &lt;Liam.Howlett@Oracle.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=047487241ff59374fded8c477f21453681f5995c'>Diffstat</a> (limited to 'sound/atmel/ac97c.h')</div><table summary='diffstat' class='diffstat'>