我正在使用stm32f746vg微控制器调试嵌入式系统，其中一些速度关键的代码段加载到数据RAM而不是闪存中。其余的非关键代码都加载到flash中，默认情况下链接器会将所有.text部分放入flash中。
我用这样令人讨厌的小函数原型做这个重定位：
int main(void) __attribute__((section(".data")));
这会强制main()加载到地址0x2000 0000，这就是我想要的。不幸的是，GDB希望main()加载到地址0x0080 0000，其余的程序代码都在地址main()。因此，GDB不知道main()的行号在哪里。有没有办法告诉GDB＆＃34; arm-none-eabi-gdb实际上是在这个地址＆＃34; ？
arm-none-eabi-gcc和arm-none-eabi-gcc。-g选项运行__attribute__。/* Entry Point */
ENTRY(Reset_Handler)
/* Generate a link error if heap and stack don't fit into RAM */
_Min_Heap_Size = 0; /* required amount of heap */
_Min_Stack_Size = 0x400; /* required amount of stack */
/* Specify the memory areas */
/**
* for the time being, we are going to buffer the image in sram1. sram1 is
* entirely dedicated to buffering images.
* DTCM_RAM will be used for user variables
*/
MEMORY
{
FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 1024K
DTCM_SRAM (xrw) : ORIGIN = 0x20000000, LENGTH = 64K
/* RAM1 (xrw) : ORIGIN = 0x20010000, LENGTH = 240K*/
RAM1 (xrw) : ORIGIN = 0x20010000, LENGTH = 245760
RAM2 (xrw) : ORIGIN = 0x2004c000, LENGTH = 16K
ITCM_SRAM (xrw) : ORIGIN = 0x00000000, LENGTH = 16K
}
/* Define output sections */
SECTIONS
{
/* Vectors need to be loaded at the start of flash. */
.isr_vector :
{
. = ALIGN(4);
KEEP(*(.vector)) /* Startup code */
. = ALIGN(4);
} >FLASH
/* The program code and other data goes into FLASH */
.text :
{
. = ALIGN(4);
*(.text) /* .text sections (code) */
*(.text*) /* .text* sections (code) */
*(.rodata) /* .rodata sections (constants, strings, etc.) */
*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
*(.glue_7) /* glue arm to thumb code */
*(.glue_7t) /* glue thumb to arm code */
*(.eh_frame)
/*KEEP (*(.init))*/
/*KEEP (*(.fini))*/
. = ALIGN(4);
_etext = .; /* define a global symbols at end of code */
_exit = .;
} >FLASH
.ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH
.ARM : {
__exidx_start = .;
*(.ARM.exidx*)
__exidx_end = .;
} >FLASH
/* used by the startup to initialize data */
_sidata = .;
/* Initialized data sections goes into RAM, load LMA copy after code */
.data ORIGIN(DTCM_SRAM) :
{
. = ALIGN(4);
_sdata = .; /* create a global symbol at data start */
*(.data) /* .data sections */
*(.data*) /* .data* sections */
. = ALIGN(4);
_edata = .; /* define a global symbol at data end */
} AT > FLASH
__const_data_length__ = SIZEOF(.data);
/* Uninitialized data section */
. = ALIGN(4);
.bss . :
{
/* This is used by the startup in order to initialize the .bss secion */
_sbss = .; /* define a global symbol at bss start */
__bss_start__ = _sbss;
*(.bss)
*(.bss*)
*(COMMON)
. = ALIGN(4);
_ebss = .; /* define a global symbol at bss end */
__bss_end__ = _ebss;
} >DTCM_SRAM
/* User_heap_stack section, used to check that there is enough RAM left */
._user_heap_stack :
{
. = ALIGN(4);
PROVIDE ( end = . );
PROVIDE ( _end = . );
. = . + _Min_Heap_Size;
. = . + _Min_Stack_Size;
. = ALIGN(4);
} >DTCM_SRAM
/* ram1 section, vars must be located here explicitly */
/* Example: extern int foo(void) __attribute__ ((section (".ram1"))); */
/* No initialization is offered for this section.*/
.ram1 ORIGIN(RAM1) :
{
*(.ram1)
} >RAM1
/* Remove information from the standard libraries */
/DISCARD/ :
{
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}
.ARM.attributes 0 : { *(.ARM.attributes) }
}
指令的main原型时，GDB找到行号没有问题。以下是我的链接描述文件：
CFLAGS = -gstabs -Wall -std=gnu99 -ffunction-sections -Wno-unused-variable
CFLAGS += -mlittle-endian -mthumb -mcpu=cortex-m4 -mthumb-interwork
CFLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16 -mlong-calls
CFLAGS += -I. -ggdb
CFLAGS += -DHSE_VALUE=$(HSE_VALUE)
CFLAGS += -DUSE_STDPERIPH_DRIVER
这些是我的gcc标志
import tensorflow答案 0 :(得分：1)
你可以通过将main（）放在你选择的特殊代码部分来实现这一点，然后调用它.fast_exec
int main(void) __attribute__((section(".fast_exec")));
然后，在链接描述文件中，将此新部分放在RAM中执行。它将在启动时从FLASH复制：
.fast_exec : {
*(.fast_exec)
} > DTCM_SRAM AT> FLASH
您可以通过检查地图文件来验证此效果。