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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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232f5dd785
git commitdc7ee00d47("s390: lowcore stack pointer offsets") introduced a regression in regard to s390_backtrace(). The stack pointer for the asynchronous stack in the lowcore now has an additional offset applied. This offset needs to be taken into account in the calculation for the low and high address for the stack. This bug was already partially fixed with commit9cc5c206d9("s390/dumpstack: fix address ranges for asynchronous and panic stack"). This patch fixes it also for the oprofile code. Fixes:dc7ee00d47("s390: lowcore stack pointer offsets") Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
79 lines
1.7 KiB
C
79 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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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]);
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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;
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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]);
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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]);
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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, frame_size;
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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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frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
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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,
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S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
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S390_lowcore.async_stack + frame_size);
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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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