链接脚本浪费了我的记忆 [英] linker script wastes my memory
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问题描述
这是我的问题.我有一个链接标准 arm7nommu-uClinux 内核的链接器脚本:
here's my problem. I have this linker script that links a standard arm7nommu-uClinux kernel:
OUTPUT_ARCH(arm)
ENTRY(stext)
SECTIONS
{
. = 0x0;
.vectors : {
*(.resetvector)
}
. = 0x8000;
.init : { /* Init code and data */
_stext = .;
__init_begin = .;
*(.text.init)
__proc_info_begin = .;
*(.proc.info)
__proc_info_end = .;
__arch_info_begin = .;
*(.arch.info)
__arch_info_end = .;
__tagtable_begin = .;
*(.taglist)
__tagtable_end = .;
*(.data.init)
. = ALIGN(16);
__setup_start = .;
*(.setup.init)
__setup_end = .;
__initcall_start = .;
*(.initcall.init)
__initcall_end = .;
. = ALIGN(4096);
__init_end = .;
}
/DISCARD/ : { /* Exit code and data */
*(.text.exit)
*(.data.exit)
*(.exitcall.exit)
}
.text : { /* Real text segment */
_text = .; /* Text and read-only data */
*(.text)
*(.fixup)
*(.gnu.warning)
*(.text.lock) /* out-of-line lock text */
*(.rodata)
*(.rodata.str1.4)
*(.glue_7)
*(.glue_7t)
*(.kstrtab)
. = ALIGN(16);
__start___ex_table = .; /* Exception table */
*(__ex_table)
__stop___ex_table = .;
__start___ksymtab = .; /* Kernel symbol table */
*(__ksymtab)
__stop___ksymtab = .;
__start___kallsyms = .; /* All kernel symbols */
*(__kallsyms)
__stop___kallsyms = .;
*(.got) /* Global offset table */
_etext = .; /* End of text section */
}
. = ALIGN(8192);
.data : {
__data_start = .;
/*
* first, the init task union, aligned
* to an 8192 byte boundary.
*/
*(.init.task)
/*
* then the cacheline aligned data
*/
. = ALIGN(32);
*(.data.cacheline_aligned)
/*
* and the usual data section
*/
*(.data)
CONSTRUCTORS
_edata = .;
}
.bss : {
__bss_start = .; /* BSS */
*(.bss)
*(COMMON)
. = ALIGN(0x10);
_end = . ;
_ebss = . ;
}
. = ALIGN(8192);
_end_kernel = . ;
/* Stabs debugging sections. */
.stab 0 : { *(.stab) }
.stabstr 0 : { *(.stabstr) }
.stab.excl 0 : { *(.stab.excl) }
.stab.exclstr 0 : { *(.stab.exclstr) }
.stab.index 0 : { *(.stab.index) }
.stab.indexstr 0 : { *(.stab.indexstr) }
.comment 0 : { *(.comment) }
.debug_abbrev 0 : { *(.debug_abbrev) }
.debug_info 0 : { *(.debug_info) }
.debug_line 0 : { *(.debug_line) }
.debug_pubnames 0 : { *(.debug_pubnames) }
.debug_aranges 0 : { *(.debug_aranges) }
}
我的硬件模拟器的内存架构由一个 sdram 和一个闪存组成.我想拆分我的代码部分并将(例如).text 部分放在 flash 中，将 .data 部分放在 sdram 中的特定地址处.为此，我以这种方式修改了我的链接器脚本:
The memory architecture of my hw simulator is composed by one sdram and one flash memory. I want to split the section of my code and put (for example) the .text section in flash and the .data section in sdram at a particoular address. For that purpose i have modified my linker script this way:
OUTPUT_ARCH(arm)
ENTRY(stext)
MEMORY {
sdram : ORIGIN = 0x00000000, LENGTH = 12M
flash : ORIGIN = 0x19900000, LENGTH = 4M
}
SECTIONS
{
. = 0x0;
.vectors 0x19900000 : {
*(.resetvector)
} > flash
.init 0x19908000 : { /* Init code and data */
_stext = .;
__init_begin = .;
*(.text.init)
__proc_info_begin = .;
*(.proc.info)
__proc_info_end = .;
__arch_info_begin = .;
*(.arch.info)
__arch_info_end = .;
__tagtable_begin = .;
*(.taglist)
__tagtable_end = .;
*(.data.init)
. = ALIGN(16);
__setup_start = .;
*(.setup.init)
__setup_end = .;
__initcall_start = .;
*(.initcall.init)
__initcall_end = .;
. = ALIGN(4096);
__init_end = .;
} > flash
/DISCARD/ : { /* Exit code and data */
*(.text.exit)
*(.data.exit)
*(.exitcall.exit)
}
.text 0x19910000 : { /* Real text segment */
_text = .; /* Text and read-only data */
*(.text)
*(.fixup)
*(.gnu.warning)
*(.text.lock) /* out-of-line lock text */
*(.rodata)
*(.rodata.str1.4)
*(.glue_7)
*(.glue_7t)
*(.kstrtab)
. = ALIGN(16);
__start___ex_table = .; /* Exception table */
*(__ex_table)
__stop___ex_table = .;
__start___ksymtab = .; /* Kernel symbol table */
*(__ksymtab)
__stop___ksymtab = .;
__start___kallsyms = .; /* All kernel symbols */
*(__kallsyms)
__stop___kallsyms = .;
*(.got) /* Global offset table */
_etext = .; /* End of text section */
. = ALIGN(8192);
_end_kernel = . ;
} > flash
.data 0x100000 : {
. = ALIGN(8192);
__data_start = .;
/*
* first, the init task union, aligned
* to an 8192 byte boundary.
*/
*(.init.task)
/*
* then the cacheline aligned data
*/
. = ALIGN(32);
*(.data.cacheline_aligned)
/*
* and the usual data section
*/
*(.data)
CONSTRUCTORS
_edata = .;
} > sdram
.bss : {
__bss_start = .; /* BSS */
*(.bss)
*(COMMON)
. = ALIGN(0x10);
_end = . ;
_ebss = . ;
} > sdram
/* Stabs debugging sections. */
.stab 0 : { *(.stab) }
.stabstr 0 : { *(.stabstr) }
.stab.excl 0 : { *(.stab.excl) }
.stab.exclstr 0 : { *(.stab.exclstr) }
.stab.index 0 : { *(.stab.index) }
.stab.indexstr 0 : { *(.stab.indexstr) }
.comment 0 : { *(.comment) }
.debug_abbrev 0 : { *(.debug_abbrev) }
.debug_info 0 : { *(.debug_info) }
.debug_line 0 : { *(.debug_line) }
.debug_pubnames 0 : { *(.debug_pubnames) }
.debug_aranges 0 : { *(.debug_aranges) }
}
它工作正常，因为所有部分都映射到我想要的位置，但是当正常输出文件(与之前的链接描述文件链接)大约 800Kb 时，输出文件大约为 429Mb！...为什么?请帮帮我！
It works fine because all sections are mapped where i want, but the output file is about 429Mb when the normal output file (linked with the previous linker script) is about 800Kb!... Why? Please help me!
提前致谢.
推荐答案
你也说了 :-)
.text 0x19910000 : { /* Real text segment */
0x19910000 = 428933120 ~= 409 MB
0x19910000 = 428933120 ~= 409 MB
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