github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-06 05:27:07 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph
42d976bd97
linux/tools
History
Ajay Kaher 38d35aae1b perf symbol: correction while adjusting symbol 
[ Upstream commit 6f520ce179 ]

perf doesn't provide proper symbol information for specially crafted
.debug files.

Sometimes .debug file may not have similar program header as runtime
ELF file. For example if we generate .debug file using objcopy
--only-keep-debug resulting file will not contain .text, .data and
other runtime sections. That means corresponding program headers will
have zero FileSiz and modified Offset.

Example: program header of text section of libxxx.so:

Type           Offset             VirtAddr           PhysAddr
               FileSiz            MemSiz              Flags  Align
LOAD        0x00000000003d3000 0x00000000003d3000 0x00000000003d3000
            0x000000000055ae80 0x000000000055ae80  R E    0x1000

Same program header after executing:
objcopy --only-keep-debug libxxx.so libxxx.so.debug

LOAD        0x0000000000001000 0x00000000003d3000 0x00000000003d3000
            0x0000000000000000 0x000000000055ae80  R E    0x1000

Offset and FileSiz have been changed.

Following formula will not provide correct value, if program header
taken from .debug file (syms_ss):

    sym.st_value -= phdr.p_vaddr - phdr.p_offset;

Correct program header information is located inside runtime ELF
file (runtime_ss).

Fixes: 2d86612aac ("perf symbol: Correct address for bss symbols")
Signed-off-by: Ajay Kaher <akaher@vmware.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Makhalov <amakhalov@vmware.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srivatsa S. Bhat <srivatsab@vmware.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Vasavi Sirnapalli <vsirnapalli@vmware.com>
Link: http://lore.kernel.org/lkml/1669198696-50547-1-git-send-email-akaher@vmware.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-12-31 13:32:44 +01:00
..
accounting
arch x86/cpu: Restore AMD's DE_CFG MSR after resume 2022-11-15 10:15:58 -08:00
bootconfig
bpf bpftool: Fix memory leak in do_build_table_cb 2022-12-31 13:32:23 +01:00
build perf bpf: Fix build with libbpf 0.7.0 by checking if bpf_program__set_insns() is available 2022-10-25 17:40:48 -03:00
certs
cgroup iocost_monitor: reorder BlkgIterator 2022-09-23 16:57:10 -10:00
counter
debugging
edid
firewire
firmware
gpio
hv
iio tools: iio: iio_generic_buffer: Fix read size 2022-11-01 08:48:13 +00:00
include bpf-for-netdev 2022-11-03 19:51:02 -07:00
io_uring
kvm/kvm_stat tools/kvm_stat: update exit reasons for vmx/svm/aarch64/userspace 2022-11-09 12:26:52 -05:00
laptop
leds
lib libbpf: Btf dedup identical struct test needs check for nested structs/arrays 2022-12-31 13:32:04 +01:00
memory-model
objtool objtool, kcsan: Add volatile read/write instrumentation to whitelist 2022-12-31 13:31:48 +01:00
pci
pcmcia
perf perf symbol: correction while adjusting symbol 2022-12-31 13:32:44 +01:00
power pm-graph v5.10 2022-10-25 17:46:15 +02:00
rcu
scripts
spi
testing netfilter: conntrack: set icmpv6 redirects as RELATED 2022-12-31 13:32:19 +01:00
thermal
time
tracing
usb
verification rv/dot2c: Make automaton definition static 2022-10-20 16:02:45 -04:00
virtio virtio_test: fixup for vq reset 2022-09-27 18:30:49 -04:00
vm tools/vm/slabinfo-gnuplot: use "grep -E" instead of "egrep" 2022-11-30 14:49:41 -08:00
wmi
Makefile