ESP32 Forum

Hi,

I'm using xtensa-esp32-elf-objdump[1] to analysis some ESP32-Binaries. I noticed that sometimes 0x3f single byte instructions(?) can be found in the disassembly.

For example:
I could not find any mentioning of this in the Xtensa-ISA[2]. Why are they placed there?

Regards

[1] https://github.com/badgeteam/xtensa-esp ... master/bin
[2] https://esp32.com/download/file.php?id=10134

Objdump is not very smart and may be trying to decode non-instruction areas, like literal pools.

This could also be caused by the ELF file missing additional xtensa-specific sections; we have fixed this issue in https://github.com/espressif/esp-idf/co ... 98277fb3bb, but it could be that your ELF file was built with an IDF version which doesn't contain that fix.