ab1b6f03a1
Simplify the stacktrace code: - remove the unused task argument to save_stack_trace, it's always current - remove the all_contexts flag, it's alwasy 0 Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Andi Kleen <ak@suse.de> Cc: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
85 lines
2.0 KiB
C
85 lines
2.0 KiB
C
/*
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* arch/s390/kernel/stacktrace.c
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*
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* Stack trace management functions
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*
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* Copyright (C) IBM Corp. 2006
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
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*/
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#include <linux/sched.h>
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#include <linux/stacktrace.h>
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#include <linux/kallsyms.h>
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static unsigned long save_context_stack(struct stack_trace *trace,
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unsigned int *skip,
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unsigned long sp,
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unsigned long low,
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unsigned long high)
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{
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struct stack_frame *sf;
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struct pt_regs *regs;
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unsigned long addr;
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while(1) {
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sp &= PSW_ADDR_INSN;
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if (sp < low || sp > high)
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return sp;
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sf = (struct stack_frame *)sp;
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while(1) {
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addr = sf->gprs[8] & PSW_ADDR_INSN;
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if (!(*skip))
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trace->entries[trace->nr_entries++] = addr;
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else
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(*skip)--;
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if (trace->nr_entries >= trace->max_entries)
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return sp;
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low = sp;
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sp = sf->back_chain & PSW_ADDR_INSN;
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if (!sp)
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break;
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if (sp <= low || sp > high - sizeof(*sf))
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return sp;
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sf = (struct stack_frame *)sp;
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}
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/* Zero backchain detected, check for interrupt frame. */
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sp = (unsigned long)(sf + 1);
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if (sp <= low || sp > high - sizeof(*regs))
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return sp;
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regs = (struct pt_regs *)sp;
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addr = regs->psw.addr & PSW_ADDR_INSN;
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if (!(*skip))
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trace->entries[trace->nr_entries++] = addr;
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else
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(*skip)--;
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if (trace->nr_entries >= trace->max_entries)
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return sp;
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low = sp;
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sp = regs->gprs[15];
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}
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}
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void save_stack_trace(struct stack_trace *trace)
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{
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register unsigned long sp asm ("15");
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unsigned long orig_sp, new_sp;
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orig_sp = sp & PSW_ADDR_INSN;
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new_sp = save_context_stack(trace, &trace->skip, orig_sp,
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S390_lowcore.panic_stack - PAGE_SIZE,
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S390_lowcore.panic_stack);
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if (new_sp != orig_sp)
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return;
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new_sp = save_context_stack(trace, &trace->skip, new_sp,
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S390_lowcore.async_stack - ASYNC_SIZE,
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S390_lowcore.async_stack);
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if (new_sp != orig_sp)
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return;
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save_context_stack(trace, &trace->skip, new_sp,
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S390_lowcore.thread_info,
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S390_lowcore.thread_info + THREAD_SIZE);
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return;
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}
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