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The code in base-hw/src/bootstrap/platform.cc uses segment flags for identification purposes. Based on this information the code decides what to do with each segment. Unfortunately the linker script does not actually ensure the flags for a specific named segment match expectations. The code relies on implicit linker behaviour. This implicit behaviour can vary between linkers. This breaks arm_v7a base-hw builds linked with LLVM's lld linker. The segment named "ro" ends up having writeable flag set when using LLD. This patch ensures that all ELF segments in genode.ld have their required perimssion flags set explicitly. Fixes #3988 |
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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.