From 94b212c29f685ca54b5689a8e89ac7671c43d651 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Wed, 16 Nov 2005 13:38:21 +1100 Subject: powerpc: Move ppc64 boot wrapper code over to arch/powerpc This also extends the code to handle 32-bit ELF vmlinux files as well as 64-bit ones. This is sufficient for booting on new-world 32-bit powermacs (i.e. all recent machines). Signed-off-by: Paul Mackerras --- arch/powerpc/boot/crt0.S | 59 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 arch/powerpc/boot/crt0.S (limited to 'arch/powerpc/boot/crt0.S') diff --git a/arch/powerpc/boot/crt0.S b/arch/powerpc/boot/crt0.S new file mode 100644 index 000000000000..9cc442263939 --- /dev/null +++ b/arch/powerpc/boot/crt0.S @@ -0,0 +1,59 @@ +/* + * Copyright (C) Paul Mackerras 1997. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * NOTE: this code runs in 32 bit mode and is packaged as ELF32. + */ + +#include "ppc_asm.h" + + .text + .globl _zimage_start +_zimage_start: + bl reloc_offset + +reloc_offset: + mflr r0 + lis r9,reloc_offset@ha + addi r9,r9,reloc_offset@l + subf. r0,r9,r0 + beq clear_caches + +reloc_got2: + lis r9,__got2_start@ha + addi r9,r9,__got2_start@l + lis r8,__got2_end@ha + addi r8,r8,__got2_end@l + subf. r8,r9,r8 + beq clear_caches + srwi. r8,r8,2 + mtctr r8 + add r9,r0,r9 +reloc_got2_loop: + lwz r8,0(r9) + add r8,r8,r0 + stw r8,0(r9) + addi r9,r9,4 + bdnz reloc_got2_loop + +clear_caches: + lis r9,_start@h + add r9,r0,r9 + lis r8,_etext@ha + addi r8,r8,_etext@l + add r8,r0,r8 +1: dcbf r0,r9 + icbi r0,r9 + addi r9,r9,0x20 + cmplwi 0,r9,8 + blt 1b + sync + isync + + mr r6,r1 + b start + -- cgit v1.2.2 From 68643cfb879ad8c327441f875b60981822016575 Mon Sep 17 00:00:00 2001 From: Olaf Hering Date: Thu, 17 Nov 2005 22:09:02 +0100 Subject: [PATCH] ppc boot: replace string labels with numbers Replacing the string labels with numbers saves 117 bytes in the final zImage. These local labels are not discared. Signed-off-by: Olaf Hering arch/powerpc/boot/crt0.S | 23 +++++++++++------------ 1 files changed, 11 insertions(+), 12 deletions(-) Signed-off-by: Paul Mackerras --- arch/powerpc/boot/crt0.S | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-) (limited to 'arch/powerpc/boot/crt0.S') diff --git a/arch/powerpc/boot/crt0.S b/arch/powerpc/boot/crt0.S index 9cc442263939..d2f2ace56cd3 100644 --- a/arch/powerpc/boot/crt0.S +++ b/arch/powerpc/boot/crt0.S @@ -14,43 +14,42 @@ .text .globl _zimage_start _zimage_start: - bl reloc_offset + bl 1f -reloc_offset: +1: mflr r0 - lis r9,reloc_offset@ha - addi r9,r9,reloc_offset@l + lis r9,1b@ha + addi r9,r9,1b@l subf. r0,r9,r0 - beq clear_caches + beq 3f -reloc_got2: lis r9,__got2_start@ha addi r9,r9,__got2_start@l lis r8,__got2_end@ha addi r8,r8,__got2_end@l subf. r8,r9,r8 - beq clear_caches + beq 3f srwi. r8,r8,2 mtctr r8 add r9,r0,r9 -reloc_got2_loop: +2: lwz r8,0(r9) add r8,r8,r0 stw r8,0(r9) addi r9,r9,4 - bdnz reloc_got2_loop + bdnz 2b -clear_caches: +3: lis r9,_start@h add r9,r0,r9 lis r8,_etext@ha addi r8,r8,_etext@l add r8,r0,r8 -1: dcbf r0,r9 +4: dcbf r0,r9 icbi r0,r9 addi r9,r9,0x20 cmplwi 0,r9,8 - blt 1b + blt 4b sync isync -- cgit v1.2.2