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: Jiri Olsa <[e-mail]>
Acked-by: Jean Pihet <[e-mail]>
Cc: Corey Ashford <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Frederic Weisbecker <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jean Pihet <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/Makefile.perf

···
   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

···
+#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

···
 #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
 
 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

···
 	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;
 
···
 		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;
 
···
 	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;
 		}
···
 
 	offset = addr - start;
 	*valp  = *(unw_word_t *)&stack->data[offset];
-	pr_debug("unwind: access_mem addr %p, val %lx, offset %d\n",
-		 (void *)addr, (unsigned long)*valp, offset);
+	pr_debug("unwind: access_mem addr %p val %lx, offset %d\n",
+		 (void *) addr, (unsigned long)*valp, offset);
 	return 0;
 }
 
···
 {
 	struct unwind_info *ui = arg;
 	int id, ret;
+	u64 val;
 
 	/* Don't support write, I suspect we don't need it. */
 	if (__write) {
···
 	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;
 }
···
 			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,
···
 	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;