d75383400e
1.【需求描述】 动态库开发部分： gcc的sample code。 提供生成暴露接口生成机制，并允许产品新增需要暴露的接口。 提供可以判断库允许资源大小的能力，并提供相关工具辅助开发者确定开发的库要求的资源是否可以满足。 动态库运行部分： 提供elf load的api，可以加载指定路径下的库，并完成符号重映射等运行准备。 提供elf 暴露符号调用的api，用于调用库的api。 elf加载&链接异常时，有明确错误记录，返回明确错误类型。 提供elf 卸载的api。 2.【方案描述】 (1) 通过灌段的形式记录需要导出符号的地址信息，用于暴露内核对外的接口，在加载链接器中通过查询 对应的符号信息获取符号地址。 (2) 加载链接时，解析共享库并将共享库中可加载段通过文件系统读入内存中，并对共享库中未定义的、 需要重定位的符号进行重定位。需要调用符号时，根据符号名通过哈希表即可查询共享库提供的对应符号 的地址。 BREAKING CHANGE: 新增4个对外接口，声明在los_dynlink.h文件中，分别为： (1) LOS_DynlinkInit: 动态加载模块初始化。 (2) LOS_SoLoad: 加载指定路径的共享库。 (3) LOS_FindSym: 根据共享库句柄查找指定符号。 (4) LOS_SoUnload: 卸载共享库。 close #I418HJ Signed-off-by: Haryslee <lihao189@huawei.com> Change-Id: I7669b7ef20096294f9d1094c85ac6602fefad354
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├── components --- Components available for porting and header files exposed externally
│ ├── backtrace --- Backtrace
│ ├── cppsupport --- C++
│ ├── cpup --- CPUP
│ ├── dynlink --- Dynamic loader & linker
│ ├── exchook --- Exception hook
│ ├── fs --- File System
│ └── net --- Network
├── kal --- Kernel Abstraction Layer, APIs exposed externally, including CMSIS APIs and part of POSIX APIs
│ ├── cmsis --- CMSIS
│ └── posix --- POSIX
├── kernel --- Code for defining the minimum kernel function set
│ ├── arch --- Code of the kernel instruction architecture layer
│ │ ├── arm --- ARM32 architecture
│ │ │ ├── cortex-m3 --- Cortex-m3 architecture
│ │ │ │ └── keil --- Implementation of the Keil toolchain
│ │ │ ├── cortex-m33 --- Cortex-m33 architecture
│ │ │ │ │── gcc --- Implementation of the GCC toolchain
│ │ │ │ └── iar --- Implementation of the IAR toolchain
│ │ │ └── cortex-m4 --- Cortex-m4 architecture
│ │ │ │ │── gcc --- Implementation of the GCC toolchain
│ │ │ │ └── iar --- Implementation of the IAR toolchain
│ │ │ └── cortex-m7 --- Cortex-m7 architecture
│ │ │ │ │── gcc --- Implementation of the GCC toolchain
│ │ │ │ └── iar --- Implementation of the IAR toolchain
│ │ ├── risc-v --- Risc-v architecture
│ │ │ ├── nuclei --- Nuclei architecture
│ │ │ │ └── gcc --- Implementation of the GCC toolchain
│ │ │ └── riscv32 --- Riscv32 architecture
│ │ │ │ └── gcc --- Implementation of the GCC toolchain
│ │ └── include
│ │ ├── los_arch.h --- Arch initialization
│ │ ├── los_atomic.h --- Atomic operations
│ │ ├── los_context.h --- Context switch
│ │ ├── los_interrupt.h --- Interrupts
│ │ ├── los_mpu.h --- Memory protection unit operations
│ │ └── los_timer.h --- Timer operations
│ ├── include
│ │ ├── los_config.h --- Configuration parameters
│ │ ├── los_event.h --- Events management
│ │ ├── los_membox.h --- Membox management
│ │ ├── los_memory.h --- Heap memory management
│ │ ├── los_mux.h --- Mutex
│ │ ├── los_queue.h --- Queue
│ │ ├── los_sched.h --- Scheduler
│ │ ├── los_sem.h --- Semaphores
│ │ ├── los_sortlink.h --- Sort link
│ │ ├── los_swtmr.h --- Timer
│ │ ├── los_task.h --- Tasks
│ │ └── los_tick.h --- Tick
│ └── src
├── targets
│ └── targets
│ └── riscv_nuclei_demo_soc_gcc
│ │ ├── GCC --- Compilation config
│ │ ├── OS_CONFIG --- Board config
│ │ ├── SoC --- SOC codes
│ │ └── Src --- Application codes
│ └── riscv_nuclei_gd32vf103_soc_gcc
│ └── riscv_sifive_fe310_gcc
└── utils
├── internal
├── BUILD.gn --- Gn build config file
├── los_compiler.h --- Compiler configuration
├── los_debug.c --- Debugging facilities
├── los_debug.h
├── los_error.c --- Errors codes and definitions
├── los_error.h
├── los_hook.c --- Hook function facilities
├── los_hook.h
├── los_list.h --- Doubly linked list
└── los_reg.h --- Register macros
└── src