NIOS II FINSH 开启后报错

发布于 2023-07-31 22:01:14 浏览：488 订阅该版

按照网上教程一步一步进行RT thread 移植到NIOS II上，当增加FinSH组件后编译无法通过，
报错：
```
Unable to reach (null) (at 0x0200041c) from the global pointer (at 0x020205b4) because the offset (-131480) is out of the allowed range, -32678 to 32767.
```

软件错误定位：
```c
#ifdef FINSH_USING_SYMTAB
#ifdef __ARMCC_VERSION  /* ARM C Compiler */
    extern const int FSymTab$$Base;
    extern const int FSymTab$$Limit;
    finsh_system_function_init(&FSymTab$$Base, &FSymTab$$Limit);
#elif defined (__ICCARM__) || defined(__ICCRX__)      /* for IAR Compiler */
    finsh_system_function_init(__section_begin("FSymTab"),
                               __section_end("FSymTab"));
#elif defined (__GNUC__) || defined(__TI_COMPILER_VERSION__) || defined(__TASKING__)
    /* GNU GCC Compiler and TI CCS */
    extern const int __fsymtab_start;
    extern const int __fsymtab_end;
    finsh_system_function_init(&__fsymtab_start, &__fsymtab_end);
#elif defined(__ADSPBLACKFIN__) /* for VisualDSP++ Compiler */
    finsh_system_function_init(&__fsymtab_start, &__fsymtab_end);//错误位置
#elif defined(_MSC_VER)
    unsigned int *ptr_begin, *ptr_end;

if (shell)
    {
        rt_kprintf("finsh shell already init.\n");
        return RT_EOK;
    }

ptr_begin = (unsigned int *)&__fsym_begin;
    ptr_begin += (sizeof(struct finsh_syscall) / sizeof(unsigned int));
    while (*ptr_begin == 0) ptr_begin ++;

ptr_end = (unsigned int *) &__fsym_end;
    ptr_end --;
    while (*ptr_end == 0) ptr_end --;

finsh_system_function_init(ptr_begin, ptr_end);
#endif
#endif
```

不知道错在哪里，查了很多资料也没有搞定，请高人指点！

1 个回答

Cherry58 2023-08-17

这家伙很懒，什么也没写！

BSP Builder 生成的linker.x文件中把FSymTab看做普通用户自定义区，而 FSymTab在RT Thread 中对应为heap（堆），因此BSP Builder直接生成的文件中有专门地方放heap段。如下 .bss :
```
    {
        __bss_start = ABSOLUTE(.);
        PROVIDE (__sbss_start = ABSOLUTE(.));
        PROVIDE (___sbss_start = ABSOLUTE(.));

*(.dynsbss)
        *(.sbss .sbss.* .gnu.linkonce.sb.*)
        *(.sbss2 .sbss2.* .gnu.linkonce.sb2.*)
        *(.scommon)

PROVIDE (__sbss_end = ABSOLUTE(.));
        PROVIDE (___sbss_end = ABSOLUTE(.));

*(.dynbss)
        *(.bss .bss.* .gnu.linkonce.b.*)
        *(COMMON)

. = ALIGN(4);
        __bss_end = ABSOLUTE(.);
    } > sdram

/*
     *
     * One output section mapped to the associated memory device for each of
     * the available memory devices. These are not used by default, but can
     * be used by user applications by using the .section directive.
     *
     * **The output section used for the heap is treated in a special way,**
     * i.e. the symbols "end" and "_end" are added to point to the heap start.
     *
     * Because alt_load() is enabled, these sections have
     * their LMA set to be loaded into the .text memory region.
     * However, the alt_load() code will NOT automatically copy
     * these sections into their mapped memory region.
     *
     */
	 //将生成的FSymTab 段 拷贝在这里
	 FSymTab :
    {
        PROVIDE (_alt_partition_FSymTab_start = ABSOLUTE(.));
        *(FSymTab FSymTab.*)
        . = ALIGN(4);
        PROVIDE (_alt_partition_FSymTab_end = ABSOLUTE(.));
    } > sdram
	  VSymTab :
    {
        PROVIDE (_alt_partition_VSymTab_start = ABSOLUTE(.));
        *(VSymTab VSymTab.*)
        . = ALIGN(4);
        PROVIDE (_alt_partition_VSymTab_end = ABSOLUTE(.));
    } > sdram
    /*
     *
     * This section's LMA is set to the .text region.
     * crt0 will copy to this section's specified mapped region virtual memory address (VMA)
     *
     */

.epcs_flash : AT ( LOADADDR (.bss) + SIZEOF (.bss) )
    {
        PROVIDE (_alt_partition_epcs_flash_start = ABSOLUTE(.));
        *(.epcs_flash .epcs_flash. epcs_flash.*)
        . = ALIGN(4);
        PROVIDE (_alt_partition_epcs_flash_end = ABSOLUTE(.));
    } > epcs_flash
```