ac0f5f0407
[ Upstream commit 63e80314ab7cf4783526d2e44ee57a90514911c9 ] Clang cannot translate the string "r30" into a valid register yet. Link: https://github.com/ClangBuiltLinux/linux/issues/755 Link: http://lkml.kernel.org/r/20191028155722.23419-1-ndesaulniers@google.com Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Suggested-by: Sid Manning <sidneym@quicinc.com> Reviewed-by: Brian Cain <bcain@codeaurora.org> Cc: Allison Randal <allison@lohutok.net> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Richard Fontana <rfontana@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
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* Stacktrace support for Hexagon
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*
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* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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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/thread_info.h>
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#include <linux/module.h>
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struct stackframe {
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unsigned long fp;
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unsigned long rets;
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};
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/*
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* Save stack-backtrace addresses into a stack_trace buffer.
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*/
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void save_stack_trace(struct stack_trace *trace)
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{
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unsigned long low, high;
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unsigned long fp;
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struct stackframe *frame;
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int skip = trace->skip;
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low = (unsigned long)task_stack_page(current);
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high = low + THREAD_SIZE;
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fp = (unsigned long)__builtin_frame_address(0);
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while (fp >= low && fp <= (high - sizeof(*frame))) {
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frame = (struct stackframe *)fp;
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if (skip) {
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skip--;
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} else {
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trace->entries[trace->nr_entries++] = frame->rets;
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if (trace->nr_entries >= trace->max_entries)
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break;
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}
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/*
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* The next frame must be at a higher address than the
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* current frame.
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*/
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low = fp + sizeof(*frame);
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fp = frame->fp;
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}
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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