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authorHeiko Carstens <heiko.carstens@de.ibm.com>2006-07-03 00:24:41 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 15:27:02 -0700
commit5bdc9b447c0076f494a56fdcd93ee8c5e78a2afd (patch)
tree4e2b7a27b6cd227ac67b9d127838aaea36ec3fd8 /arch
parent21b32bbff950771f196da91011249fa05fa83b32 (diff)
downloadlinux-2.6.34-ux500-5bdc9b447c0076f494a56fdcd93ee8c5e78a2afd.tar.gz
[PATCH] lockdep: stacktrace subsystem, s390 support
stacktrace interface for s390 as needed by lock validator. [clg@fr.ibm.com: build fix] Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/Kconfig4
-rw-r--r--arch/s390/kernel/Makefile1
-rw-r--r--arch/s390/kernel/stacktrace.c90
3 files changed, 95 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 821a141889d..5b28da4ad80 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -7,6 +7,10 @@ config MMU
bool
default y
+config STACKTRACE_SUPPORT
+ bool
+ default y
+
config RWSEM_GENERIC_SPINLOCK
bool
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 9269b5788fa..eabf00a6f77 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_COMPAT) += compat_linux.o compat_signal.o \
obj-$(CONFIG_BINFMT_ELF32) += binfmt_elf32.o
obj-$(CONFIG_VIRT_TIMER) += vtime.o
+obj-$(CONFIG_STACKTRACE) += stacktrace.o
# Kexec part
S390_KEXEC_OBJS := machine_kexec.o crash.o
diff --git a/arch/s390/kernel/stacktrace.c b/arch/s390/kernel/stacktrace.c
new file mode 100644
index 00000000000..de83f38288d
--- /dev/null
+++ b/arch/s390/kernel/stacktrace.c
@@ -0,0 +1,90 @@
+/*
+ * arch/s390/kernel/stacktrace.c
+ *
+ * Stack trace management functions
+ *
+ * Copyright (C) IBM Corp. 2006
+ * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
+ */
+
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/kallsyms.h>
+
+static inline unsigned long save_context_stack(struct stack_trace *trace,
+ unsigned int *skip,
+ unsigned long sp,
+ unsigned long low,
+ unsigned long high)
+{
+ struct stack_frame *sf;
+ struct pt_regs *regs;
+ unsigned long addr;
+
+ while(1) {
+ sp &= PSW_ADDR_INSN;
+ if (sp < low || sp > high)
+ return sp;
+ sf = (struct stack_frame *)sp;
+ while(1) {
+ addr = sf->gprs[8] & PSW_ADDR_INSN;
+ if (!(*skip))
+ trace->entries[trace->nr_entries++] = addr;
+ else
+ (*skip)--;
+ if (trace->nr_entries >= trace->max_entries)
+ return sp;
+ 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;
+ }
+ /* 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;
+ addr = regs->psw.addr & PSW_ADDR_INSN;
+ if (!(*skip))
+ trace->entries[trace->nr_entries++] = addr;
+ else
+ (*skip)--;
+ if (trace->nr_entries >= trace->max_entries)
+ return sp;
+ low = sp;
+ sp = regs->gprs[15];
+ }
+}
+
+void save_stack_trace(struct stack_trace *trace,
+ struct task_struct *task, int all_contexts,
+ unsigned int skip)
+{
+ register unsigned long sp asm ("15");
+ unsigned long orig_sp;
+
+ sp &= PSW_ADDR_INSN;
+ orig_sp = sp;
+
+ sp = save_context_stack(trace, &skip, sp,
+ S390_lowcore.panic_stack - PAGE_SIZE,
+ S390_lowcore.panic_stack);
+ if ((sp != orig_sp) && !all_contexts)
+ return;
+ sp = save_context_stack(trace, &skip, sp,
+ S390_lowcore.async_stack - ASYNC_SIZE,
+ S390_lowcore.async_stack);
+ if ((sp != orig_sp) && !all_contexts)
+ return;
+ if (task)
+ save_context_stack(trace, &skip, sp,
+ (unsigned long) task_stack_page(task),
+ (unsigned long) task_stack_page(task) + THREAD_SIZE);
+ else
+ save_context_stack(trace, &skip, sp, S390_lowcore.thread_info,
+ S390_lowcore.thread_info + THREAD_SIZE);
+ return;
+}