From be5bfc030892300b830d9ec66dedf914f18f7c56 Mon Sep 17 00:00:00 2001
From: fabient <fabient@FreeBSD.org>
Date: Wed, 23 May 2012 13:23:40 +0000
Subject: Soft PMC support for ARM. Callgraph is not captured, only current
 location.

Sample system wide profiling: "pmcstat -Sclock.hard -T"
---
 sys/dev/hwpmc/hwpmc_arm.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

(limited to 'sys/dev/hwpmc')

diff --git a/sys/dev/hwpmc/hwpmc_arm.c b/sys/dev/hwpmc/hwpmc_arm.c
index 86cfaf3..fc76165 100644
--- a/sys/dev/hwpmc/hwpmc_arm.c
+++ b/sys/dev/hwpmc/hwpmc_arm.c
@@ -38,38 +38,47 @@ __FBSDID("$FreeBSD$");
 struct pmc_mdep *
 pmc_md_initialize()
 {
+#ifdef CPU_XSCALE_IXP425
 	if (cpu_class == CPU_CLASS_XSCALE)
 		return pmc_xscale_initialize();
 	else
+#endif
 		return NULL;
 }
 
 void
 pmc_md_finalize(struct pmc_mdep *md)
 {
+#ifdef CPU_XSCALE_IXP425
 	if (cpu_class == CPU_CLASS_XSCALE)
 		pmc_xscale_finalize(md);
 	else
 		KASSERT(0, ("[arm,%d] Unknown CPU Class 0x%x", __LINE__,
 		    cpu_class));
+#endif
+}
+
+static int
+pmc_save_callchain(uintptr_t *cc, int maxsamples,
+    struct trapframe *tf)
+{
+
+	*cc = PMC_TRAPFRAME_TO_PC(tf);
+	return (1);
 }
 
 int
 pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples,
     struct trapframe *tf)
 {
-	(void) cc;
-	(void) maxsamples;
-	(void) tf;
-	return (0);
+
+	return pmc_save_callchain(cc, maxsamples, tf);
 }
 
 int
 pmc_save_user_callchain(uintptr_t *cc, int maxsamples,
     struct trapframe *tf)
 {
-	(void) cc;
-	(void) maxsamples;
-	(void) tf;
-	return (0);
+
+	return pmc_save_callchain(cc, maxsamples, tf);
 }
-- 
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