On 07/09/2019 16:25, Sebastian Huber wrote:
----- Am 6. Sep 2019 um 18:06 schrieb Sebastian Huber
sebastian.hu...@embedded-brains.de:
----- Am 6. Sep 2019 um 11:09 schrieb Sebastian Huber
sebastian.hu...@embedded-brains.de:
On 06/09/2019 09:26, Sebastian Huber wrote:
On 06/09/2019 09:01, Chris Johns wrote:
On 6/9/19 4:20 pm, Sebastian Huber wrote:
Hello,
I tried the rtems-addr2line on ARM and SPARC. On SPARC it seems to
work fine,
however, on ARM I get this:
rtems-addr2line -e
build/arm-rtems5-xilinx_zynq_a9_qemu-everything/media01.exe
0x0000135a
/home/EB/sebastian_h/git-rtems-5/c/src/lib/libbsp/arm/xilinx-zynq/../../../../../../bsps/arm/shared/irq/irq-gic.c:264
addr2line -e
build/arm-rtems5-xilinx_zynq_a9_qemu-everything/media01.exe 0000135a
/scratch/git-rtems-libbsd/build/arm-rtems5-xilinx_zynq_a9_qemu-everything/../../testsuite/include/rtems/bsd/test/default-network-init.h:179
The GNU tool is right. It is also considerably faster.
I would hope it is faster and exact. It has had many years of work on it,
written in C and not a means to test a C++ framework so we can grow an
ecosystem. I have stated its purpose before. I am perplexed by the
intent of
this statement.
If you want to compare performance I suggest you try the elftools one?
There is
one. It is not built because GNU provides one and good one.
Also be-careful as the exec call is not as fast as Linux on all the
hosts we
support.
That the GNU tool is faster was just an observation.
Do we have a working library solution to get from an address to the
source line/function? I don't have time to debug the DWARF support code
at the moment.
I have a working solution using "addr2line" and rld::process::execute().
Thanks for the hint to the elftoolchain:
https://github.com/elftoolchain/elftoolchain/blob/trunk/addr2line/addr2line.c
To me it looks pretty complicated. It should be possible to refactor
this code to use it as a library, e.g. call translate() for each address
you need the source information.
I tried to debug the rld get_source() problem for more than two hours
and the elftoolchain code looks similar. I am not sure what to do.
Another option is to use the LLVM infrastructure:
https://github.com/llvm-mirror/llvm/blob/master/tools/llvm-symbolizer/llvm-symbolizer.cpp
From a first glance, this looks like the way to go.
Attached is a patch which uses the LLVM library to get an addr2line
functionality. The code to resolve an address is very easy (item.data is the
address):
auto res_or_err = symbolizer_.symbolizeCode(elf_file_, item.data);
if (res_or_err) {
auto info = res_or_err.get();
std::string fn = info.FunctionName;
std::string str;
if (fn != "<invalid>") {
str += fn;
str += " at ";
}
str += llvm::sys::path::filename(info.FileName);
str += ":";
str += std::to_string(info.Line);
LLVM has also support for command line arguments, file handling, etc.
The LLVM solution is also the fastest so far:
time ../build/trace/rtems-record-lttng -e media01.exe records.bin
real 0m0.425s
user 0m0.293s
sys 0m0.132s
addr2line based solution on Linux:
real 0m11.944s
user 0m5.334s
sys 0m6.593s
LLVM has also an API to access the DWARF debug information:
https://github.com/llvm-mirror/llvm/blob/master/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
llvm-dwarfdump media.exe | grep '\<_Workspace_Allocate\>' -B 10 -A 40
0x0163bea5: DW_TAG_subprogram
DW_AT_external (true)
DW_AT_name ("_Workspace_Allocate")
DW_AT_decl_file ("wkspace.c")
DW_AT_decl_line (232)
DW_AT_prototyped (true)
DW_AT_type (0x016388fd "*")
DW_AT_low_pc (0x0000000000746092)
DW_AT_high_pc (0x00000000007460b4)
DW_AT_frame_base (DW_OP_call_frame_cfa)
DW_AT_unknown_2116 (true)
DW_AT_sibling (0x0163bedb)
0x0163bebe: DW_TAG_formal_parameter
DW_AT_name ("size")
DW_AT_decl_file ("wkspace.c")
DW_AT_decl_line (233)
DW_AT_type (0x01638817 "size_t")
DW_AT_location (DW_OP_fbreg -20)
This could be used to generate wrapper functions and generic record
function entry/exit consumers.
--
Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone : +49 89 189 47 41-16
Fax : +49 89 189 47 41-09
E-Mail : sebastian.hu...@embedded-brains.de
PGP : Public key available on request.
Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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