请教版主关于链接的问题

发布于 2012-09-08 22:26:36 浏览：10169 订阅该版

25 个回答

bernard 2012-09-08

这家伙很懒，什么也没写！

lkm_unication 2012-09-09

这家伙很懒，什么也没写！

lkm_unication 2012-09-10

这家伙很懒，什么也没写！

版主, 我的自定义段以及链接脚本如下:

自定义段如下:
```c
#if defined (__GNUC__)                /* GNU GCC Compiler */

struct __initcall_symtab
{
	const char *func_name;
	void *func_addr;
};

#define __define_initcall(level,fn,id) \
	const struct __initcall_symtab __initcall_##fn##_##id __attribute_used__ \
	__attribute__((__section__(".initcall" level ".init"))) = \
    {\
      #fn,\
      (void *)fn\
    }

#define DRIVER_REGISTER(fn) __define_initcall("1",fn,1)

#endif
```

注册如下
`DRIVER_REGISTER(uart1_init);`

脚本如下:
```c
OUTPUT_FORMAT ("elf32-littlearm", "elf32-bigarm", "elf32-littlearm")
ENTRY(vector_tables)
MEMORY
{
    /* STM32F103xG has 1M FLASH and 96K SRAM */
    CODE  (rx) : ORIGIN = 0x08000000, LENGTH = 1M   /* 1M FLASH */
    DATA  (rw) : ORIGIN = 0x20000000, LENGTH = 96k  /* 96K SRAM */
}

/* main stack size, used by OS (as MSP) */
system_stack_size = 0x200;

SECTIONS
{
    .text :
    {
        . = ALIGN(4);
        KEEP(*(.isr_vector))            /* vector tables */

. = ALIGN(4);
        *(.text*)                        /* remaining code */

. = ALIGN(4);
        __driver_reg_start = ABSOLUTE(.);
        KEEP(*(.initcall1.init))       /* driver register functions */
        __driver_reg_end = ABSOLUTE(.);

*(.rodata*)              /* read-only data (constants) */

/* section information for finsh shell */
        . = ALIGN(4);
        __fsymtab_start = .;
        KEEP(*(FSymTab))      /* functions symtab */
        __fsymtab_end = .;
        . = ALIGN(4);
        __vsymtab_start = .;
        KEEP(*(VSymTab))      /* variables symtab */
        __vsymtab_end = .;

. = ALIGN(4);
        __text_end = .;

. = ALIGN(4);
        /*  
         *  This is used by the global variables initial function,
         *  in order to initialize the .data secion. 
         */
        __data_in_flash = .;

} > CODE = 0xFF

/* .data section which is used for initialized data */

.data : AT (__data_in_flash) /* initialized value load address at __data_in_flash */
    {
        . = ALIGN(4);
        /* start address of .data secion which in SRAM */
        __data_start = .;

*(.data*)

. = ALIGN(4);
        /* end address of .data secion which in SRAM */
        __data_end = .;
    } > DATA = 0x00
    
    .bss :
    {
        . = ALIGN(4);
        /* start address of .bss secion which in SRAM */
        __bss_start = .;

*(.bss*)

. = ALIGN(4);
        /* end address of .bss secion which in SRAM */
        __bss_end = .;
    } > DATA = 0x00

.stack : 
    {
        . = ALIGN(8); /* according to ARMv7-M.pdf page 720, ARM recommend 
                         used 8 bytes stack */
        . = . + system_stack_size;
        . = ALIGN(8);

/* end address of .bss secion which in SRAM */
        __handler_mode_stack_base = .;
    } > DATA = 0x00
    
    __heap_start = .;
}

从链接的MAP看出, 自定义段是没有内容的.
               0x08009d04                __driver_reg_start = ABSOLUTE (.)
 *(.initcall1.init)
                0x08009d04                __driver_reg_end = ABSOLUTE (.)

这是FSymTab的内容
                0x0800b4c0                __fsymtab_start = .
 *(FSymTab)
 FSymTab        0x0800b4c0        0xc libs/librtos_STM32F103xG.a(mem.o)
                0x0800b4c0                __fsym_list_mem
 FSymTab        0x0800b4cc       0x90 libs/libfinsh.a(cmd.o)
                0x0800b4cc                __fsym_list
                0x0800b4d8                __fsym_list_device
                0x0800b4e4                __fsym_list_timer
                0x0800b4f0                __fsym_list_mempool
                0x0800b4fc                __fsym_list_msgqueue
                0x0800b508                __fsym_list_mailbox
                0x0800b514                __fsym_list_mutex
                0x0800b520                __fsym_list_event
                0x0800b52c                __fsym_list_sem
                0x0800b538                __fsym_list_thread
                0x0800b544                __fsym_version
                0x0800b550                __fsym_hello
                0x0800b55c                __fsymtab_end = .
```