From: Andreas Krebbel <[email protected]>
[patch 6/17] s390: add oprofile callgraph support.
Signed-off-by: Andreas Krebbel <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
---
arch/s390/oprofile/Makefile | 2 -
arch/s390/oprofile/backtrace.c | 79 +++++++++++++++++++++++++++++++++++++++++
arch/s390/oprofile/init.c | 4 ++
3 files changed, 84 insertions(+), 1 deletion(-)
diff -urpN linux-2.6/arch/s390/oprofile/backtrace.c linux-2.6-patched/arch/s390/oprofile/backtrace.c
--- linux-2.6/arch/s390/oprofile/backtrace.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6-patched/arch/s390/oprofile/backtrace.c 2005-12-09 14:24:25.000000000 +0100
@@ -0,0 +1,79 @@
+/**
+ * arch/s390/oprofile/backtrace.c
+ *
+ * S390 Version
+ * Copyright (C) 2005 IBM Corporation, IBM Deutschland Entwicklung GmbH.
+ * Author(s): Andreas Krebbel <[email protected]>
+ */
+
+#include <linux/oprofile.h>
+
+#include <asm/processor.h> /* for struct stack_frame */
+
+static unsigned long
+__show_trace(unsigned int *depth, unsigned long sp,
+ unsigned long low, unsigned long high)
+{
+ struct stack_frame *sf;
+ struct pt_regs *regs;
+
+ while (*depth) {
+ sp = sp & PSW_ADDR_INSN;
+ if (sp < low || sp > high - sizeof(*sf))
+ return sp;
+ sf = (struct stack_frame *) sp;
+ (*depth)--;
+ oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
+
+ /* Follow the backchain. */
+ while (*depth) {
+ low = sp;
+ sp = sf->back_chain & PSW_ADDR_INSN;
+ if (!sp)
+ break;
+ if (sp <= low || sp > high - sizeof(*sf))
+ return sp;
+ sf = (struct stack_frame *) sp;
+ (*depth)--;
+ oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
+
+ }
+
+ if (*depth == 0)
+ break;
+
+ /* Zero backchain detected, check for interrupt frame. */
+ sp = (unsigned long) (sf + 1);
+ if (sp <= low || sp > high - sizeof(*regs))
+ return sp;
+ regs = (struct pt_regs *) sp;
+ (*depth)--;
+ oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
+ low = sp;
+ sp = regs->gprs[15];
+ }
+ return sp;
+}
+
+void s390_backtrace(struct pt_regs * const regs, unsigned int depth)
+{
+ unsigned long head;
+ struct stack_frame* head_sf;
+
+ if (user_mode (regs))
+ return;
+
+ head = regs->gprs[15];
+ head_sf = (struct stack_frame*)head;
+
+ if (!head_sf->back_chain)
+ return;
+
+ head = head_sf->back_chain;
+
+ head = __show_trace(&depth, head, S390_lowcore.async_stack - ASYNC_SIZE,
+ S390_lowcore.async_stack);
+
+ __show_trace(&depth, head, S390_lowcore.thread_info,
+ S390_lowcore.thread_info + THREAD_SIZE);
+}
diff -urpN linux-2.6/arch/s390/oprofile/init.c linux-2.6-patched/arch/s390/oprofile/init.c
--- linux-2.6/arch/s390/oprofile/init.c 2005-10-28 02:02:08.000000000 +0200
+++ linux-2.6-patched/arch/s390/oprofile/init.c 2005-12-09 14:24:25.000000000 +0100
@@ -12,8 +12,12 @@
#include <linux/init.h>
#include <linux/errno.h>
+
+extern void s390_backtrace(struct pt_regs * const regs, unsigned int depth);
+
int __init oprofile_arch_init(struct oprofile_operations* ops)
{
+ ops->backtrace = s390_backtrace;
return -ENODEV;
}
diff -urpN linux-2.6/arch/s390/oprofile/Makefile linux-2.6-patched/arch/s390/oprofile/Makefile
--- linux-2.6/arch/s390/oprofile/Makefile 2005-10-28 02:02:08.000000000 +0200
+++ linux-2.6-patched/arch/s390/oprofile/Makefile 2005-12-09 14:24:25.000000000 +0100
@@ -6,4 +6,4 @@ DRIVER_OBJS = $(addprefix ../../../drive
oprofilefs.o oprofile_stats.o \
timer_int.o )
-oprofile-y := $(DRIVER_OBJS) init.o
+oprofile-y := $(DRIVER_OBJS) init.o backtrace.o
-
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