HI Daniel, I'm using CodeSourcery 4.5.2. I've configured and have built the code for "incaip" board and "dbau1000". The results are the same. (i.e. gp has been set with wrong value)
Could you tell me the CodeSourcery toolchain versions known to be working? I'd like to try out the same version. Thanks, Justin ________________________________________ From: Daniel Schwierzeck [[email protected]] Sent: Tuesday, February 26, 2013 1:52 AM To: Juhyun (Justin) Oh Cc: [email protected] Subject: Re: [U-Boot] [u-boot-mips] gp init and -pie option 2013/2/25 Juhyun (Justin) Oh <[email protected]>: > Hi, > > I got a problem while I was trying out v2013.01.01 on the u-boot-mips fork > repo. It looks like my u-boot binary built with "-pie" linker option doesn't > work due to wrong "gp" initialization. > > In the "start.S" file, the gp is supposed to be initialized with "_gp" > because ra will hold the address of ".word _gp" line. The below is part of > "start.S". > > ---------------------------- > ... > /* Initialize $gp */ > bal 1f > nop > .word _gp > 1: > lw gp, 0(ra) > ... > ---------------------------- > > Without the -pie option, linker puts the start address of the .got section. > However, with -pie option, the ".word _gp" is translated to "nop". The below > is disassembled code. > > ---------------------------------------------------------------------------- > 84001490 <reset>: > ... > 840014b8: 40804800 mtc0 zero,c0_count > 840014bc: 40805800 mtc0 zero,c0_compare > 840014c0: 04110002 bal 840014cc <reset+0x3c> > 840014c4: 00000000 nop > 840014c8: 00000000 nop <--------------- > 840014cc: 8ffc0000 lw gp,0(ra) > 840014d0: 3c1d8440 lui sp,0x8440 > 840014d4: 8f9982c0 lw t9,-32064(gp) > 840014d8: 03200008 jr t9 > 840014dc: 00000000 nop > ---------------------------------------------------------------------------- > > Could anyone tell me what is going on here? Am I missing anything? > > Thanks, > Justin which board and toolchain do you use? PIE support has been tested with various toolchains from ELDK, CodeSourcery and OpenWRT. -- Best regards, Daniel _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
