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Liu, Changcheng 95a8798254 scripts/faddr2line: extend usage on generic arch

When cross-compiling, fadd2line should use the binary tool used for the
target system, rather than that of the host.

Link: http://lkml.kernel.org/r/20171121092911.GA150711@sofia
Signed-off-by: Liu Changcheng <changcheng.liu@intel.com>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: NeilBrown <neilb@suse.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2017-11-29 18:40:42 -08:00

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#!/bin/bash

SPDX-License-Identifier: GPL-2.0

Translate stack dump function offsets.

addr2line doesn't work with KASLR addresses. This works similarly to

addr2line, but instead takes the 'func+0x123' format as input:

$ ./scripts/faddr2line ~/k/vmlinux meminfo_proc_show+0x5/0x568

meminfo_proc_show+0x5/0x568:

meminfo_proc_show at fs/proc/meminfo.c:27

If the address is part of an inlined function, the full inline call chain is

printed:

$ ./scripts/faddr2line ~/k/vmlinux native_write_msr+0x6/0x27

native_write_msr+0x6/0x27:

arch_static_branch at arch/x86/include/asm/msr.h:121

(inlined by) static_key_false at include/linux/jump_label.h:125

(inlined by) native_write_msr at arch/x86/include/asm/msr.h:125

The function size after the '/' in the input is optional, but recommended.

It's used to help disambiguate any duplicate symbol names, which can occur

rarely. If the size is omitted for a duplicate symbol then it's possible for

multiple code sites to be printed:

$ ./scripts/faddr2line ~/k/vmlinux raw_ioctl+0x5

raw_ioctl+0x5/0x20:

raw_ioctl at drivers/char/raw.c:122

raw_ioctl+0x5/0xb1:

raw_ioctl at net/ipv4/raw.c:876

Multiple addresses can be specified on a single command line:

$ ./scripts/faddr2line ~/k/vmlinux type_show+0x10/45 free_reserved_area+0x90

type_show+0x10/0x2d:

type_show at drivers/video/backlight/backlight.c:213

free_reserved_area+0x90/0x123:

free_reserved_area at mm/page_alloc.c:6429 (discriminator 2)

set -o errexit set -o nounset

READELF="${CROSS_COMPILE}readelf" ADDR2LINE="${CROSS_COMPILE}addr2line" SIZE="${CROSS_COMPILE}size" NM="${CROSS_COMPILE}nm"

command -v awk >/dev/null 2>&1 || die "awk isn't installed" command -v ${READELF} >/dev/null 2>&1 || die "readelf isn't installed" command -v ${ADDR2LINE} >/dev/null 2>&1 || die "addr2line isn't installed" command -v ${SIZE} >/dev/null 2>&1 || die "size isn't installed" command -v ${NM} >/dev/null 2>&1 || die "nm isn't installed"

usage() { echo "usage: faddr2line

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