** >>>>>>>>>>>>>##*/
/* Entry Point */
NOTE：程序中第⼀条运⾏的指令被称为⼊⼝点entry point，可以使⽤ENTRY链接脚本命令设置entry point，参数是⼀个符号名：
有⼏种⽅法可以设置entry point，链接器会按照如下的顺序来try各种⽅法，只要任何⼀种⽅法成功则会停⽌：
the ‘-e’ entry command-line option;
the ENTRY(symbol) command in a linker script;
the value of the symbol start, if defined;
the address of the first byte of the ‘.text’ section, if present;
The address 0
ENTRY(Reset_Handler)
/*
DEFINED(symbol)⽤于判断symbol在符号表中是否有定义，如果有定义则返回1否则返回0 */
HEAP_SIZE = DEFINED(__heap_size__) ? __heap_size__ : 0x0400; STACK_SIZE = DEFINED(__stack_size__) ? __stack_size__ : 0x0400; /* Specify the memory areas */ /*定义内存区域的起始地址和长度*/ MEMORY
{
m_interrupts (RX) : ORIGIN = 0x00000000, LENGTH = 0x00000400
m_flash_config (RX) : ORIGIN = 0x00000400, LENGTH = 0x00000010
m_text (RX) : ORIGIN = 0x00000410, LENGTH = 0x000FFBF0
m_data (RW) : ORIGIN = 0x1FFF0000, LENGTH = 0x00010000
夏尔丹m_data_2 (RW) : ORIGIN = 0x20000000, LENGTH = 0x00030000
}
/* Define output sections */
SECTIONS
{
/* The startup code goes first into internal flash */
.interrupts :
{
. = ALIGN(4);
/*
isr_vector在start.S中定义：.section .isr_vector, "a"，按照MEMORY命令说明，isr_vector由于没有指定输出section，因此会创建与输⼊section同名的输出section，且会按照isr_vector的属性放到合适的内存区域，此处KEEP是保证isr_vector的输出section不会被删除 */
KEEP(*(.isr_vector)) /* Startup code */
. = ALIGN(4);
} > m_interrupts
.flash_config :
{
. = ALIGN(4);
KEEP(*(.FlashConfig)) /* Flash Configuration Field (FCF) */
. = ALIGN(4);
} > m_flash_config
/* The program code and other data goes into internal 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);
} > m_text
.ab :
{
*(.ab* .gnu.linkonce.armextab.*)
} > m_text
.ARM :
{
__exidx_start = .;
*(.idx*)
__exidx_end = .;
} > m_text
.ctors :
{
__CTOR_LIST__ = .;
/* gcc uses crtbegin.o to find the start of
2013北京中考物理the constructors, so we make sure it is
first. Because this is a wildcard, it
doesn't matter if the user does not
actually link against crtbegin.o; the
linker won't look for a file to match a
wildcard. The wildcard also means that it
doesn't matter which directory crtbegin.o
is in. */
KEEP (*crtbegin.o(.ctors))
KEEP (*crtbegin?.o(.ctors))
/* We don't want to include the .ctor section from
from the crtend.o file until after the sorted ctors.
The .ctor section from the crtend file contains the
end of ctors marker and it must be last */
KEEP (*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors))
KEEP (*(SORT(.ctors.*)))
KEEP (*(.ctors))
__CTOR_END__ = .;
} > m_text
.dtors :
{
__DTOR_LIST__ = .;
KEEP (*crtbegin.o(.dtors))
KEEP (*crtbegin?.o(.dtors))
KEEP (*(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors))
KEEP (*(SORT(.dtors.*)))
KEEP (*(.dtors))
__DTOR_END__ = .;
} > m_text
.preinit_array :
{
共享PROVIDE_HIDDEN (__preinit_array_start = .);
KEEP (*(.preinit_array*))
PROVIDE_HIDDEN (__preinit_array_end = .);
} > m_text
.init_array :
{
PROVIDE_HIDDEN (__init_array_start = .);
KEEP (*(SORT(.init_array.*)))
KEEP (*(.init_array*))
PROVIDE_HIDDEN (__init_array_end = .);
} > m_text
.fini_array :
{
PROVIDE_HIDDEN (__fini_array_start = .);
KEEP (*(SORT(.fini_array.*)))
KEEP (*(.fini_array*))
PROVIDE_HIDDEN (__fini_array_end = .);
} > m_text
__etext = .; /* define a global symbol at end of code */
__DATA_ROM = .; /* Symbol is used by startup for data initialization */
.data : AT(__DATA_ROM)
{
. = ALIGN(4);
__DATA_RAM = .;
__data_start__ = .; /* create a global symbol at data start */
*(.data) /* .data sections */
*(.data*) /* .data* sections */
KEEP(*(.jcr*))
. = ALIGN(4);
__data_end__ = .; /* define a global symbol at data end */
} > m_data
__DATA_END = __DATA_ROM + (__data_end__ - __data_start__);
text_end = ORIGIN(m_text) + LENGTH(m_text);
ASSERT(__DATA_END <= text_end, "region m_text overflowed with text and data") /* Uninitialized data section */
.bss :
{
/* This is used by the startup in order to initialize the .bss section */
. = ALIGN(4);
__START_BSS = .;
__bss_start__ = .;
*(.bss)
*(.bss*)
*(COMMON)
. = ALIGN(4);
__bss_end__ = .;
__END_BSS = .;
} > m_data
.heap :
{
.
= ALIGN(8);
__end__ = .;
PROVIDE(end = .);
__HeapBase = .;
. += HEAP_SIZE;
国发3号文件__HeapLimit = .;
__heap_limit = .; /* Add for _sbrk */
} > m_data_2
.stack :
{
. = ALIGN(8);
.
+= STACK_SIZE;
} > m_data_2
/* Initializes stack on the end of block */
__StackTop = ORIGIN(m_data_2) + LENGTH(m_data_2);
北极七鳃鳗__StackLimit = __StackTop - STACK_SIZE;
PROVIDE(__stack = __StackTop);
.ARM.attributes 0 : { *(.ARM.attributes) }
音乐风云榜2013ASSERT(__StackLimit >= __HeapLimit, "region m_data_2 overflowed with stack and heap") }
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