Commit c9b951c4 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
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perf callchain: Separate perf_reg_value function in perf_regs object 



Making perf_reg_value function global (formely reg_value), because it's
going to be used globaly across all code providing the dwarf post unwind
feature.

Changing its prototype to be generic:

  -int reg_value(unw_word_t *valp, struct regs_dump *regs, int id)
  +int perf_reg_value(u64 *valp, struct regs_dump *regs, int id);

Changing the valp type from libunwind specific 'unw_word_t' to u64.

Signed-off-by: default avatarJiri Olsa <jolsa@redhat.com>
Acked-by: default avatarJean Pihet <jean.pihet@linaro.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1389098853-14466-13-git-send-email-jolsa@redhat.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 9ff125d1

tools/perf/Makefile.perf

+1 −0
Original line number Diff line number Diff line
@@ -538,6 +538,7 @@ ifeq ($(NO_PERF_REGS),0) 
  ifeq ($(ARCH),x86)

    LIB_H += arch/x86/include/perf_regs.h

  endif

  LIB_OBJS += $(OUTPUT)util/perf_regs.o

endif



ifndef NO_LIBNUMA

tools/perf/util/perf_regs.c

0 → 100644
+19 −0
Original line number Diff line number Diff line 
#include <errno.h>

#include "perf_regs.h"



int perf_reg_value(u64 *valp, struct regs_dump *regs, int id)

{

	int i, idx = 0;

	u64 mask = regs->mask;



	if (!(mask & (1 << id)))

		return -EINVAL;



	for (i = 0; i < id; i++) {

		if (mask & (1 << i))

			idx++;

	}



	*valp = regs->regs[idx];

	return 0;

}

tools/perf/util/perf_regs.h

+13 −0
Original line number Diff line number Diff line 
#ifndef __PERF_REGS_H

#define __PERF_REGS_H



#include "types.h"

#include "event.h"



#ifdef HAVE_PERF_REGS_SUPPORT

#include <perf_regs.h>



int perf_reg_value(u64 *valp, struct regs_dump *regs, int id);



#else

#define PERF_REGS_MASK	0
@@ -10,5 +16,12 @@ static inline const char *perf_reg_name(int id __maybe_unused) 
{

	return NULL;

}



static inline int perf_reg_value(u64 *valp __maybe_unused,

				 struct regs_dump *regs __maybe_unused,

				 int id __maybe_unused)

{

	return 0;

}

#endif /* HAVE_PERF_REGS_SUPPORT */

#endif /* __PERF_REGS_H */

tools/perf/util/unwind-libunwind.c

+12 −26
Original line number Diff line number Diff line
@@ -390,30 +390,13 @@ static int access_dso_mem(struct unwind_info *ui, unw_word_t addr, 
	return !(size == sizeof(*data));

}



static int reg_value(unw_word_t *valp, struct regs_dump *regs, int id)

{

	int i, idx = 0;

	u64 mask = regs->mask;



	if (!(mask & (1 << id)))

		return -EINVAL;



	for (i = 0; i < id; i++) {

		if (mask & (1 << i))

			idx++;

	}



	*valp = regs->regs[idx];

	return 0;

}



static int access_mem(unw_addr_space_t __maybe_unused as,

		      unw_word_t addr, unw_word_t *valp,

		      int __write, void *arg)

{

	struct unwind_info *ui = arg;

	struct stack_dump *stack = &ui->sample->user_stack;

	unw_word_t start, end;

	u64 start, end;

	int offset;

	int ret;
@@ -423,7 +406,7 @@ static int access_mem(unw_addr_space_t __maybe_unused as, 
		return 0;

	}



	ret = reg_value(&start, &ui->sample->user_regs, PERF_REG_SP);

	ret = perf_reg_value(&start, &ui->sample->user_regs, PERF_REG_SP);

	if (ret)

		return ret;
@@ -436,8 +419,9 @@ static int access_mem(unw_addr_space_t __maybe_unused as, 
	if (addr < start || addr + sizeof(unw_word_t) >= end) {

		ret = access_dso_mem(ui, addr, valp);

		if (ret) {

			pr_debug("unwind: access_mem %p not inside range %p-%p\n",

				(void *)addr, (void *)start, (void *)end);

			pr_debug("unwind: access_mem %p not inside range"

				 " 0x%" PRIx64 "-0x%" PRIx64 "\n",

				 (void *) addr, start, end);

			*valp = 0;

			return ret;

		}
@@ -446,7 +430,7 @@ static int access_mem(unw_addr_space_t __maybe_unused as, 


	offset = addr - start;

	*valp  = *(unw_word_t *)&stack->data[offset];

	pr_debug("unwind: access_mem addr %p, val %lx, offset %d\n",

	pr_debug("unwind: access_mem addr %p val %lx, offset %d\n",

		 (void *) addr, (unsigned long)*valp, offset);

	return 0;

}
@@ -457,6 +441,7 @@ static int access_reg(unw_addr_space_t __maybe_unused as, 
{

	struct unwind_info *ui = arg;

	int id, ret;

	u64 val;



	/* Don't support write, I suspect we don't need it. */

	if (__write) {
@@ -473,12 +458,13 @@ static int access_reg(unw_addr_space_t __maybe_unused as, 
	if (id < 0)

		return -EINVAL;



	ret = reg_value(valp, &ui->sample->user_regs, id);

	ret = perf_reg_value(&val, &ui->sample->user_regs, id);

	if (ret) {

		pr_err("unwind: can't read reg %d\n", regnum);

		return ret;

	}



	*valp = (unw_word_t) val;

	pr_debug("unwind: reg %d, val %lx\n", regnum, (unsigned long)*valp);

	return 0;

}
@@ -572,7 +558,7 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg, 
			struct machine *machine, struct thread *thread,

			struct perf_sample *data, int max_stack)

{

	unw_word_t ip;

	u64 ip;

	struct unwind_info ui = {

		.sample       = data,

		.thread       = thread,
@@ -583,7 +569,7 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg, 
	if (!data->user_regs.regs)

		return -EINVAL;



	ret = reg_value(&ip, &data->user_regs, PERF_REG_IP);

	ret = perf_reg_value(&ip, &data->user_regs, PERF_REG_IP);

	if (ret)

		return ret;

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