[PATCH] lockdep: stacktrace subsystem, s390 support (5bdc9b44) · Commits · 戴 / test

arch/s390/Kconfig

+4 −0

Original line number	Diff line number	Diff line
		@@ -7,6 +7,10 @@ config MMU
		bool
		default y

		config STACKTRACE_SUPPORT
		bool
		default y

		config RWSEM_GENERIC_SPINLOCK
		bool

arch/s390/kernel/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

arch/s390/kernel/stacktrace.c

0 → 100644

+90 −0

Original line number	Diff line number	Diff line
		/*
		* 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;
		}

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