diff options
| -rw-r--r-- | arch/s390/Kconfig | 4 | ||||
| -rw-r--r-- | arch/s390/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/stacktrace.c | 90 |
3 files changed, 95 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 821a141889de..5b28da4ad809 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 9269b5788fac..eabf00a6f770 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 000000000000..de83f38288d0 --- /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; +} |