Add backtrace functions for sandbox, including:
- os_backtrace() to collect addresses into a caller-supplied buffer
- os_backtrace_symbols() to convert addresses to symbol strings
- os_backtrace_symbols_free() to free the symbol array
The libbacktrace library (bundled with GCC) reads DWARF debug information
to provide detailed symbol resolution including function names (even for
static functions), source file paths, and line numbers.
The sandbox backtrace implementation wraps these OS functions to implement
the generic backtrace API (backtrace_init, backtrace_get_syms, etc.).
Enable it for just the 'sandbox' board. Add the library for the Rust
example too.
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
The current Makefile for the ulib examples is not very easy to modify.
Split it into three parts:
- config.mk containing the variables used by the build tools
- a list of programs and the objects in each one
- rules.mk with some rules to make it all work
Use sys-objs to indicate objects which should be built with system
headers. Use U-Boot headers by default.
With this it is fairly simply to add a new program. Of course we could
make use of U-Boot's kbuild implementation to tidy this up, but the
purpose of the examples is to show how to do things outside the U-Boot
build system.
Co-developed-by: Claude <noreply@anthropic.com>
Co-developed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
