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The _exit function currently passes -1 as a "sig" to the _kill function as an invalid signal number so that _kill can distinguish between an abort and a standard exit. For boards using the SYS_EXIT_EXTENDED semi-hosting operation to return a status code, this means that the "status" paramter to _exit is ignored and the return code is always -1. https://developer.arm.com/docs/100863/latest/semihosting-operations/sys_exit_extended-0x20 This patch puts shared code between _kill and _exit into a new function _kill_shared that takes the semi-hosting "reason" to use (if semi-hosting is available) as an argument. For semi-hosting _kill_shared provides that "reason". Without the "sig" argument being used to distinguish between a normal and abnormal exit, the _exit function can provide the return code to be used if the SYS_EXIT_EXTENDED operation is available. Hence the exit code can be returned.
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.