Question

我有一个像这样定义的函数表类型

typedef struct
{
    uint16_t majorRevision;
    uint16_t minorRevision;
    uint8_t  (*CommInit)(void *);
    uint8_t  (*CommDeInit)(void);
    uint16_t (*Write)(uint8_t *, uint16_t);
    uint16_t (*Read)(uint8_t *, uint16_t);
    uint8_t  (*Attached)(void);
    uint8_t  (*ExitApp)(uint8_t);
    uint8_t  (*Jump)(uint32_t address);
    uint16_t (*GetCRC)(uint8_t*, uint32_t);
    int      (*Encrypt)(uint8_t *, uint32_t);
    int      (*Decrypt)(uint8_t *, uint32_t);
    uint8_t  (*Reset)(void);
    uint32_t (*GetTickCount)(void);
    void     (*Sleep)(uint32_t);
    uint8_t  (*ReadASCIIByte)(void);
    uint16_t (*ReadASCIIWord)(void);
    uint32_t (*ReadASCIIDWord)(void);
    void     (*WriteASCIIByte)(uint8_t);
    void     (*WriteASCIIWord)(uint16_t);
    void     (*WriteASCIIDWord)(uint32_t);
    void     (*PutChar)(uint8_t);
    uint8_t  (*GetChar)(void);
    uint8_t  (*WaitChar)(uint8_t *, uint32_t);
    uint8_t  (*IsOpen)(void);
} BootFunctionTable_t;

然后我使用default_function_attribute pragma声明该类型的变量，强制它到特定地址并用我的特定函数填充它。

#pragma default_variable_attributes = @ "boottable"
BootFunctionTable_t bootFunctions =
{
        MAJOR_REVISION,
        MINOR_REVISION,
        BootSerialInit,     /* Communication Init */
        BootSerialDeInit,   /* Communication Deinit */
        BootSerialWrite,
        BootSerialRead,
        BootSerialAttached,
        BootExitToApp,
        BootJump,
        BootGetCRC,
        NULL,
        NULL,
        BootReset,
        BootGetTickCount,
        BootSleep,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        BootSerialPutChar,
        BootSerialGetChar,
        NULL
};
#pragma default_variable_attributes =

在main中我创建一个新指针并将其指向我试图强制该表的地址

BootFunctionTable_t * bootf;
bootf = (BootFunctionTable_t *)0x080000200;

最后，我在链接器文件中创建了部分

/*###ICF### Section handled by ICF editor, don't touch! ****/
/*-Editor annotation file-*/
/* IcfEditorFile="$TOOLKIT_DIR$\config\ide\IcfEditor\cortex_v1_0.xml" */
/*-Specials-*/

define symbol __ICFEDIT_intvec_start__ =    0x08000000;

/*-Memory Regions-*/
define symbol __ICFEDIT_region_ROM_start__    = 0x08000300;
define symbol __ICFEDIT_region_ROM_end__      = 0x080FFFFF;
define symbol __ICFEDIT_region_RAM_start__    = 0x20000000;
define symbol __ICFEDIT_region_RAM_end__      = 0x2001FFFF;
define symbol __ICFEDIT_region_CCMRAM_start__ = 0x10000000;
define symbol __ICFEDIT_region_CCMRAM_end__   = 0x1000FFFF;
/*-Sizes-*/
define symbol __ICFEDIT_size_cstack__ = 0x400;
define symbol __ICFEDIT_size_heap__   = 0x200;
/**** End of ICF editor section. ###ICF###*/


define memory mem with size = 4G;
define region ROM_region        = mem:[from __ICFEDIT_region_ROM_start__   to __ICFEDIT_region_ROM_end__];
define region RAM_region        = mem:[from __ICFEDIT_region_RAM_start__   to __ICFEDIT_region_RAM_end__];
define region CCMRAM_region     = mem:[from __ICFEDIT_region_CCMRAM_start__   to __ICFEDIT_region_CCMRAM_end__];
define region BOOTTABLE_region  = mem:[from 0x08000200 to 0x080002FF];

initialize by copy {section boottable};
place in BOOTTABLE_region { readonly section boottable};

define block CSTACK    with alignment = 8, size = __ICFEDIT_size_cstack__   { };
define block HEAP      with alignment = 8, size = __ICFEDIT_size_heap__     { };

initialize by copy { readwrite };
do not initialize  { section .noinit };

place at address mem:__ICFEDIT_intvec_start__ { readonly section .intvec };


place in ROM_region   { readonly };
place in RAM_region   { readwrite,
                        block CSTACK, block HEAP };

但我不能将链接器放在请求的地址上。有人可以告诉我我做错了什么吗？我甚至无法将该部分显示在地图文件中。我能找到的唯一例子是.intvec部分，但是向量表是在汇编文件中定义的。我想将我的boottable放在一个C文件中。

Answer 1

链接器排除未使用的符号。

尝试明确告诉链接器保留该部分。添加如下行：

keep { section boottable };

Answer 2

@ user694733是正确的。因为我实际上并没有使用

BootFunctionTable_t bootFunctions

而是链接器将其遗漏的硬编码地址。我将代码更改为

BootFunctionTable_t * bootf;
bootf = &bootFunctions;

并且也修复了它。

Answer 3

我不得不说我无法获得“保持”链接程序指令来为我工作。我确实找到了IAR注释51348 https://www.iar.com/support/tech-notes/linker/the-linker-removing-functions-and-variables-or-external-not-found/，该注释建议使用__root强制链接器保留内容，这对我有用。

不能使用IAR ARM编译器强制功能表到特定地址

3 个答案: