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This patch untangles the interplay of the base library and the libc during the exit handling. - The CXA ABI for the atexit handling is now provided by the libc. For plain Genode components without libc dependency, __cxa_atexit is a no-op, which is consistent with Genode's notion of components. - The 'abort' implementation of the base library no longer calls 'genode_exit' but merely 'sleep_forever'. This way, the cxx library no longer depends on a 'genode_exit' implementation. - The libc provides 'atexit' support by storing metadata on the libc kernel's heap now, thereby eliminating the former bounded maximum number of atexit handlers. - Shared-library dtors are no longer called via the atexit mechanism by explicitly by the dynamic linker. This slightly changes the call order of destructors (adjustment of the ldso test). Functions marked as destructors are called after the atexit handlers now. - The libc executes atexit handlers in the application context, which supports the I/O operations in those handles, in particular the closing of file descriptors. Fixes #3851
This is generic part of the Genode implementation. It consists of two parts: :_Core_: is the ultimate root of the Genode application tree and provides abstractions for the lowest-level hardware resources such as RAM, ROM, CPU, and generic device access. All generic parts of Core can be found here - for system-specific implementations refer to the appropriate 'base-<system>' directory. :_Base libraries and protocols_: that are used by each Genode component to interact with other components. This is the glue that holds everything together. _Core_ may export information about the hardware platform by an ROM called 'platform_info'. Depending on the platform, e.g. ARM or x86 or riscv, and depending on the boot mode and boot loader and kernel, some nodes may not be populated. !<platform_info> ! <acpi revision="2" rsdt="0x1fe93074" xsdt="0x1fe930e8"/> ! <boot> ! <framebuffer phys="0x7300000" width="1024" height="768" bpp="32"/> ! </boot> !</platform_info> If the ACPI RSDT and XSDT physical pointer is reported by the used kernel and/or bootloader, _Core_ may provide this information by the ROM. If the graphic device is initialised and can be directly used by a framebuffer driver, _Core_ may provide the physical pointer to the framebuffer, the resolution and color depth in bits.