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GNU utilities cannot necessarily parse objects built by LLVM, which can result in confusing errors when using 'faddr2line': $ CROSS_COMPILE=aarch64-linux-gnu- ./scripts/faddr2line vmlinux do_one_initcall+0xf4/0x260 aarch64-linux-gnu-addr2line: vmlinux: unknown type [0x13] section `.relr.dyn' aarch64-linux-gnu-addr2line: DWARF error: invalid or unhandled FORM value: 0x25 do_one_initcall+0xf4/0x260: aarch64-linux-gnu-addr2line: vmlinux: unknown type [0x13] section `.relr.dyn' aarch64-linux-gnu-addr2line: DWARF error: invalid or unhandled FORM value: 0x25 $x.73 at main.c:? Although this can be worked around by setting CROSS_COMPILE to "llvm=-", it's cleaner to follow the same syntax as the top-level Makefile and accept LLVM= as an indication to use the llvm- tools, optionally specifying their location or specific version number. Suggested-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Will Deacon <will@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Link: https://lore.kernel.org/r/20231002165750.1661-3-will@kernel.org Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
8.5 KiB
Executable File
8.5 KiB
Executable File
#!/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
usage() { echo "usage: faddr2line [--list]