From 44cab258a2754ab2d2c9af0fabd9cd6bda591fb9 Mon Sep 17 00:00:00 2001
From: jhibbits <jhibbits@FreeBSD.org>
Date: Wed, 15 Jan 2014 04:44:52 +0000
Subject: [PATCH] MFC r259394,r259395,r259699

r259394:
Rebase the PMC indices at 1, since PMC_SOFT is at 0.

r259395,r259699:
Add userland PMC backtracing, and use the PMC trapframe macros for kernel
backtraces.
---
 sys/dev/hwpmc/hwpmc_powerpc.c  | 25 ++++++++++++++++++-------
 sys/powerpc/include/pmc_mdep.h |  8 ++++----
 2 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/sys/dev/hwpmc/hwpmc_powerpc.c b/sys/dev/hwpmc/hwpmc_powerpc.c
index 25a32fa35d3..ed1f023e94e 100644
--- a/sys/dev/hwpmc/hwpmc_powerpc.c
+++ b/sys/dev/hwpmc/hwpmc_powerpc.c
@@ -45,6 +45,8 @@ __FBSDID("$FreeBSD$");
 
 #define INKERNEL(x)	(((vm_offset_t)(x)) <= VM_MAX_KERNEL_ADDRESS && \
 		((vm_offset_t)(x)) >= VM_MIN_KERNEL_ADDRESS)
+#define INUSER(x)	(((vm_offset_t)(x)) <= VM_MAXUSER_ADDRESS && \
+		((vm_offset_t)(x)) >= VM_MIN_ADDRESS)
 
 struct powerpc_cpu **powerpc_pcpu;
 
@@ -55,13 +57,13 @@ pmc_save_kernel_callchain(uintptr_t *cc, int maxsamples,
 	int frames = 0;
 	uintptr_t *sp;
 
-	cc[frames++] = tf->srr0;
-	sp = (uintptr_t *)tf->fixreg[1];
+	cc[frames++] = PMC_TRAPFRAME_TO_PC(tf);
+	sp = (uintptr_t *)PMC_TRAPFRAME_TO_FP(tf);
 
 	for (frames = 1; frames < maxsamples; frames++) {
 		if (!INKERNEL(sp))
 			break;
-		cc[frames++] = *(sp + 1);
+		cc[frames++] = sp[1];
 		sp = (uintptr_t *)*sp;
 	}
 	return (frames);
@@ -172,8 +174,17 @@ int
 pmc_save_user_callchain(uintptr_t *cc, int maxsamples,
     struct trapframe *tf)
 {
-	(void) cc;
-	(void) maxsamples;
-	(void) tf;
-	return (0);
+	uintptr_t *sp;
+	int frames = 0;
+
+	cc[frames++] = PMC_TRAPFRAME_TO_PC(tf);
+	sp = (uintptr_t *)PMC_TRAPFRAME_TO_FP(tf);
+
+	for (frames = 1; frames < maxsamples; frames++) {
+		if (!INUSER(sp))
+			break;
+		cc[frames++] = fuword(sp + 1);
+		sp = (uintptr_t *)fuword(sp);
+	}
+	return (frames);
 }
diff --git a/sys/powerpc/include/pmc_mdep.h b/sys/powerpc/include/pmc_mdep.h
index 678852b6233..a0f2062729e 100644
--- a/sys/powerpc/include/pmc_mdep.h
+++ b/sys/powerpc/include/pmc_mdep.h
@@ -7,8 +7,8 @@
 #ifndef _MACHINE_PMC_MDEP_H_
 #define	_MACHINE_PMC_MDEP_H_
 
-#define PMC_MDEP_CLASS_INDEX_PPC7450	0
-#define PMC_MDEP_CLASS_INDEX_PPC970	0
+#define PMC_MDEP_CLASS_INDEX_PPC7450	1
+#define PMC_MDEP_CLASS_INDEX_PPC970	1
 
 union pmc_md_op_pmcallocate {
 	uint64_t		__pad[4];
@@ -28,8 +28,8 @@ union pmc_md_pmc {
 	struct pmc_md_powerpc_pmc	pm_powerpc;
 };
 
-#define	PMC_TRAPFRAME_TO_PC(TF)	(0)	/* Stubs */
-#define	PMC_TRAPFRAME_TO_FP(TF)	(0)
+#define	PMC_TRAPFRAME_TO_PC(TF)	((TF)->srr0)
+#define	PMC_TRAPFRAME_TO_FP(TF)	((TF)->fixreg[1])
 #define	PMC_TRAPFRAME_TO_SP(TF)	(0)
 
 #endif
-- 
2.45.2