diff options
author | 2015-08-04 12:17:53 -0700 | |
---|---|---|
committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/metag/oprofile/backtrace.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/metag/oprofile/backtrace.c')
-rw-r--r-- | kernel/arch/metag/oprofile/backtrace.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/kernel/arch/metag/oprofile/backtrace.c b/kernel/arch/metag/oprofile/backtrace.c new file mode 100644 index 000000000..7cc3f37cb --- /dev/null +++ b/kernel/arch/metag/oprofile/backtrace.c @@ -0,0 +1,63 @@ +/* + * Copyright (C) 2010-2013 Imagination Technologies Ltd. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/oprofile.h> +#include <linux/uaccess.h> +#include <asm/processor.h> +#include <asm/stacktrace.h> + +#include "backtrace.h" + +static void user_backtrace_fp(unsigned long __user *fp, unsigned int depth) +{ + while (depth-- && access_ok(VERIFY_READ, fp, 8)) { + unsigned long addr; + unsigned long __user *fpnew; + if (__copy_from_user_inatomic(&addr, fp + 1, sizeof(addr))) + break; + addr -= 4; + + oprofile_add_trace(addr); + + /* stack grows up, so frame pointers must decrease */ + if (__copy_from_user_inatomic(&fpnew, fp + 0, sizeof(fpnew))) + break; + if (fpnew >= fp) + break; + fp = fpnew; + } +} + +static int kernel_backtrace_frame(struct stackframe *frame, void *data) +{ + unsigned int *depth = data; + + oprofile_add_trace(frame->pc); + + /* decrement depth and stop if we reach 0 */ + if ((*depth)-- == 0) + return 1; + + /* otherwise onto the next frame */ + return 0; +} + +void metag_backtrace(struct pt_regs * const regs, unsigned int depth) +{ + if (user_mode(regs)) { + unsigned long *fp = (unsigned long *)regs->ctx.AX[1].U0; + user_backtrace_fp((unsigned long __user __force *)fp, depth); + } else { + struct stackframe frame; + frame.fp = regs->ctx.AX[1].U0; /* A0FrP */ + frame.sp = user_stack_pointer(regs); /* A0StP */ + frame.lr = 0; /* from stack */ + frame.pc = regs->ctx.CurrPC; /* PC */ + walk_stackframe(&frame, &kernel_backtrace_frame, &depth); + } +} |