For a main thread a thread object is created by the CRT0 before _main gets
called so that _main can already run in a generic environment that, e.g.,
catches stack overflows as a page-fault instead of corrupting the BSS.
Additionally dynamic programs have only one CRT0 - the one of the LDSO -
which does the initialization for both LDSO and program.
ref #989
With 64K stack size, when doing 'make core' in noux on base-hw, the main thread
of /libexec/gcc/arm-elf-eabi/4.7.2/cc1plus runs into a stack overflow during
the compilation of core/main.o . Thus raise the stack size to 128K.
fix#964
- use the generic 'crt0.s' for Linux
- move the read-only '__dso_handle' definition into the '.text' section
- move the '__initial_sp' definition into the '.bss' section
- remove the '_main_utcb' definition
Part of #766.
This patch introduces a new platform 'linux_arm' for building and running
Genode/Linux on an ARM device.
Known limitations:
- libc 'setjmp()'/'longjmp()' doesn't currently save/restore floating
point registers
Fixes#746.
Martin Stein
Christian Prochaska
Norman Feske
Genode Labs