From mboxrd@z Thu Jan 1 00:00:00 1970 From: ming lei Date: Tue, 1 Nov 2005 17:33:11 +0800 Subject: [U-Boot-Users] What's going on here: global offset table Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de I am a newbie to u-boot. I found some macros in file u-boot-1.1.3\include\ppc_asm.tmpl #define START_GOT \ .section ".got2","aw"; \ .LCTOC1 = .+32768 #define END_GOT \ .text #define GET_GOT \ bl 1f ; \ .text 2 ; \ 0: .long .LCTOC1-1f ; \ .text ; \ 1: mflr r14 ; \ lwz r0,0b-1b(r14) ; \ add r14,r0,r14 ; #define GOT_ENTRY(NAME) .L_ ## NAME = . - .LCTOC1 ; .long NAME #define GOT(NAME) .L_ ## NAME (r14) in file u-boot-1.1.3\cpu\mpc8260\start.S, I found some statements as follows START_GOT GOT_ENTRY(_GOT2_TABLE_) GOT_ENTRY(_FIXUP_TABLE_) GOT_ENTRY(_start) GOT_ENTRY(_start_of_vectors) GOT_ENTRY(_end_of_vectors) GOT_ENTRY(transfer_to_handler) GOT_ENTRY(__init_end) GOT_ENTRY(_end) GOT_ENTRY(__bss_start) #if defined(CONFIG_HYMOD) GOT_ENTRY(environment) #endif END_GOT I thougt that these statement will be something as follows after preprocessed by gasp .section ".got2","aw"; .LCTOC1 = .+32768 .L___GOT2_TABLE _= . - .LCTOC1; .long _GOT2_TABLE_ ................ ............... My questions are: (1) what is the meaning of the "LCT0C1"? is ".LCTOC1" a symbol or a directive ? if ".LCTOC1" is a symbol ,why I can not see it using nm or objdump? (2) what is the meaning of the ".L__GOT2_TABLE_". what is the relation between ".L__GOT2_TABLE_" and "_GOT2_TABLE_" defined in u-boot.lds? THANKS!