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80 lines
1.8 KiB
80 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* SH specific backtracing code for oprofile |
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* |
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* Copyright 2007 STMicroelectronics Ltd. |
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* |
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* Author: Dave Peverley <[email protected]> |
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* |
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* Based on ARM oprofile backtrace code by Richard Purdie and in turn, i386 |
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* oprofile backtrace code by John Levon, David Smith |
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*/ |
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#include <linux/oprofile.h> |
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#include <linux/sched.h> |
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#include <linux/kallsyms.h> |
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#include <linux/mm.h> |
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#include <asm/unwinder.h> |
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#include <asm/ptrace.h> |
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#include <linux/uaccess.h> |
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#include <asm/sections.h> |
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#include <asm/stacktrace.h> |
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static void backtrace_address(void *data, unsigned long addr, int reliable) |
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{ |
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unsigned int *depth = data; |
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if ((*depth)--) |
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oprofile_add_trace(addr); |
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} |
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static struct stacktrace_ops backtrace_ops = { |
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.address = backtrace_address, |
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}; |
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/* Limit to stop backtracing too far. */ |
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static int backtrace_limit = 20; |
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static unsigned long * |
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user_backtrace(unsigned long *stackaddr, struct pt_regs *regs) |
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{ |
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unsigned long buf_stack; |
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/* Also check accessibility of address */ |
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if (!access_ok(stackaddr, sizeof(unsigned long))) |
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return NULL; |
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if (__copy_from_user_inatomic(&buf_stack, stackaddr, sizeof(unsigned long))) |
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return NULL; |
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/* Quick paranoia check */ |
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if (buf_stack & 3) |
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return NULL; |
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oprofile_add_trace(buf_stack); |
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stackaddr++; |
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return stackaddr; |
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} |
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void sh_backtrace(struct pt_regs * const regs, unsigned int depth) |
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{ |
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unsigned long *stackaddr; |
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/* |
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* Paranoia - clip max depth as we could get lost in the weeds. |
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*/ |
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if (depth > backtrace_limit) |
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depth = backtrace_limit; |
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stackaddr = (unsigned long *)kernel_stack_pointer(regs); |
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if (!user_mode(regs)) { |
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if (depth) |
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unwind_stack(NULL, regs, stackaddr, |
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&backtrace_ops, &depth); |
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return; |
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} |
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while (depth-- && (stackaddr != NULL)) |
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stackaddr = user_backtrace(stackaddr, regs); |
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}
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