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a53c8fab3f
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
/*
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* S390 Version
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* Copyright IBM Corp. 2005
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* Author(s): Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
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*/
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#include <linux/oprofile.h>
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#include <asm/processor.h> /* for struct stack_frame */
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static unsigned long
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__show_trace(unsigned int *depth, unsigned long sp,
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unsigned long low, 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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while (*depth) {
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sp = sp & PSW_ADDR_INSN;
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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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(*depth)--;
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oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
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/* Follow the backchain. */
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while (*depth) {
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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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(*depth)--;
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oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
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}
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if (*depth == 0)
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break;
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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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(*depth)--;
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oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);
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low = sp;
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sp = regs->gprs[15];
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}
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return sp;
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}
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void s390_backtrace(struct pt_regs * const regs, unsigned int depth)
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{
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unsigned long head;
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struct stack_frame* head_sf;
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if (user_mode (regs))
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return;
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head = regs->gprs[15];
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head_sf = (struct stack_frame*)head;
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if (!head_sf->back_chain)
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return;
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head = head_sf->back_chain;
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head = __show_trace(&depth, head, S390_lowcore.async_stack - ASYNC_SIZE,
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S390_lowcore.async_stack);
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__show_trace(&depth, head, S390_lowcore.thread_info,
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S390_lowcore.thread_info + THREAD_SIZE);
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}
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