Generating an assembly listing under platform.io

[robmaxtech]

Hello,
I'm struggling to generate an assembly listing to look a bit in-depth what's giong on (especially what happens in a timer interrupt - the prologue and epilogue seems to be too long, way more than the numbers mentioned in Ref_Interrupts.md)
The core offers "Sketch -> Export compiled binary" within the Arduino IDE, but how to do this in VS Code / platform.io?
I tried
build_type = debug
build_flags = -save-temps
but the .s files look like this:
.ascii "\357\375\030\026\306\300\002\35428\003\321\370\3530p\236\276"
.ascii "\261\232b\253\265PU7\252\036U5F\323e8\r1p\n(\370,X\265\200/."
.ascii "|p \022\305\2629\352\216s\245\027\256\357\024\365aV\233}a\316"
......

Thanks a lot for any hint!

[SpenceKonde]

/path/to/avr-objdump" --disassemble --source --line-numbers --demangle --section=.text "/path/to/setch.ino.elf" > "/path/to/outputfile.lst" (extracted from the console output of the IDE. The temp files are unreadable because of lto - lto-supporting intermediate files are not human readable. That's the price you pay for binaries that are 10-20% smaller and those compile/linktime functions like __builtin_constant_p that we make heavy use of.

…

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On Thu, Jun 1, 2023, 06:24 robmaxtech ***@***.***> wrote: Hello, I'm struggling to generate an assembly listing to look a bin in-depth what's giong on (especially what happens in a timer interrupt - the prologue and epilogue seems to be too long, way more than the numbers mentioned in Ref_Interrupts.md) The core offers "Sketch -> Export compiled binary" within the Arduino IDE, but how to do this in VS Code / platform.io? I tried build_type = debug build_flags = -save-temps but the .s files look like this: .ascii "\357\375\030\026\306\300\002\35428\003\321\370\3530p\236\276" .ascii "\261\232b\253\265PU7\252\036U5F\323e8\r1p\n(\370,X\265\200/." .ascii "|p \022\305\2629\352\216s\245\027\256\357\024\365aV\233}a\316" ...... Thanks a lot for any hint! — Reply to this email directly, view it on GitHub <#964>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTXEW3YKSEZQPQZPWIRLFTXJBUUNANCNFSM6AAAAAAYWWOJEA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[robmaxtech]

Brilliant! Works like a charm! Thanks a lot for the explanations! Your work is pure gold, really.

[SpenceKonde]

Is this something that should be added to the platformio docs?

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On Fri, Jun 2, 2023 at 5:44 AM robmaxtech ***@***.***> wrote: Brilliant! Works like a charm! Thanks a lot for the explanations! Your work is pure gold, really. — Reply to this email directly, view it on GitHub <#964 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTXEW3AEZXSP7OW6YSSHWLXJGYWZANCNFSM6AAAAAAYWWOJEA> . You are receiving this because you commented.Message ID: ***@***.*** com>

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[robmaxtech]

I think it might be helpful! Ideally with the steps how to generate it via a custom script under platformio - this is what I tried today. Basically it shouldn't be a big deal, but I struggled with spaces in the pathname for BUILD_DIR and couldn't fix it yet. But I can contribute my findings - from the perspective of a bit naive user ;-)

[SpenceKonde]

Well, how'd you do it because I have never even run PIO?

[robmaxtech]

Ok, it work sas following (I took it from here: https://five-embeddev.com/baremetal/platformio/ and modified it to work with spaces in pathnames):

In platformio.ini, under the [env] section, add the following two lines:

extra_scripts = post_build.py
targets = disasm

Add a new file to the project root folder (besides of platformio.ini) named 'post_build.py' (ugh, Python... indent alarm!!)
The content of this file is:

import os
Import("env")

#https://docs.platformio.org/en/latest/projectconf/advanced_scripting.html
#https://docs.platformio.org/en/latest/projectconf/section_env_build.html#projectconf-dynamic-build-flags

def after_build(source, target, env):
""" Run objdump on the target elf file and save the output in the top dir.
"""
objdump=env.subst("${OBJCOPY}").replace("objcopy","objdump")
src_elf=env.subst("\"${BUILD_DIR}\${PROGNAME}.elf\"")
#--disassembler-options=no-aliases,numeric
cmd=" ".join([
objdump, "-SC","--file-start-context", "-w",
src_elf,">","${PROGNAME}.lst"]) #
env.Execute(cmd)

env.AddCustomTarget(
"disasm",
"${BUILD_DIR}/${PROGNAME}.elf",
after_build,
title="Disasm 2",
description="Generate a disassembly file on demand",
always_build=True
)