From: Joakim Tjernlund Joakim.Tjernlund@transmode.se To: u-boot@lists.denx.de, Scott Wood scottwood@freescale.com, Kim
Phillips
kim.phillips@freescale.com Cc: Joakim Tjernlund Joakim.Tjernlund@transmode.se Date: 2010/10/13 23:12 Subject: [U-Boot] [PATCHv3] mpc83xx: Add -fpic relocation support Sent by: u-boot-bounces@lists.denx.de
This adds relocation of .got entries produced by -fpic. -fpic produces 2-3% smaller code and is faster. Unfortunately gcc promotes -fpic to -fPIC when -mrelocatable is used so one need a very small patch to gcc too(sent upstream).
-fpic puts its GOT entries in .got section(s) and linker defines the symbol _GLOBAL_OFFSET_TABLE_ to point to the middle of this table. The entry at _GLOBAL_OFFSET_TABLE_-4 contains a blrl insn which is used to find the table's real address by branching to _GLOBAL_OFFSET_TABLE_-4.
Ping?
Jocke