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authorSimon Glass <sjg@chromium.org>2012-02-23 03:28:41 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-03-30 07:43:44 +0200
commitdde3b70dcf3d13b3ce173a017788f7522780b857 (patch)
tree7f53c7ed439a3b6ebc3030cd7dd234799b859760
parent9492791ab462c586424217f4b6e34f61f9ef5461 (diff)
downloadtalos-obmc-uboot-dde3b70dcf3d13b3ce173a017788f7522780b857.tar.gz
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arm: add a common .lds link script
Most ARM CPUs use a very similar link script. This adds a basic script that can be used by most CPUs. Two new symbols are introduced which are intended to eventually be defined on all architectures to make things easier for generic relocation and reduce special-case code for each architecture: __image_copy_start is the start of the text area (equivalent to the existing _start on ARM). It marks the start of the region which must be copied to a new location during relocation. This symbol is called __text_start on x86 and microblaze. __image_copy_end is the end of the region which must be copied to a new location during relocation. It is normally equal to the start of the BSS region, but this can vary in some cases (SPL?). Making this an explicit symbol on its own removes any ambiguity and permits common code to always do the right thing. This new script makes use of CPUDIR, now defined by both Makefile and spl/Makefile, to find the directory containing the start.o object file, which is always placed first in the image. To permit MMU setup prior to relocation (as used by pxa) we add an area to the link script which contains space for this. This is taken from commit 7f4cfcf. CPUs can put the contents in there using their start.S file. BTW, shouldn't that area be 16KB-aligned? Signed-off-by: Simon Glass <sjg@chromium.org>
-rw-r--r--arch/arm/cpu/u-boot.lds94
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/arm/cpu/u-boot.lds b/arch/arm/cpu/u-boot.lds
new file mode 100644
index 0000000000..e49ca0c552
--- /dev/null
+++ b/arch/arm/cpu/u-boot.lds
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2004-2008 Texas Instruments
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
+OUTPUT_ARCH(arm)
+ENTRY(_start)
+SECTIONS
+{
+ . = 0x00000000;
+
+ . = ALIGN(4);
+ .text :
+ {
+ __image_copy_start = .;
+ CPUDIR/start.o (.text)
+ *(.text)
+ }
+
+ . = ALIGN(4);
+ .rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
+
+ . = ALIGN(4);
+ .data : {
+ *(.data)
+ }
+
+ . = ALIGN(4);
+
+ . = .;
+ __u_boot_cmd_start = .;
+ .u_boot_cmd : { *(.u_boot_cmd) }
+ __u_boot_cmd_end = .;
+
+ . = ALIGN(4);
+
+ __image_copy_end = .;
+
+ .rel.dyn : {
+ __rel_dyn_start = .;
+ *(.rel*)
+ __rel_dyn_end = .;
+ }
+
+ .dynsym : {
+ __dynsym_start = .;
+ *(.dynsym)
+ }
+
+ _end = .;
+
+ /*
+ * Deprecated: this MMU section is used by pxa at present but
+ * should not be used by new boards/CPUs.
+ */
+ . = ALIGN(4096);
+ .mmutable : {
+ *(.mmutable)
+ }
+
+ .bss __rel_dyn_start (OVERLAY) : {
+ __bss_start = .;
+ *(.bss)
+ . = ALIGN(4);
+ __bss_end__ = .;
+ }
+
+ /DISCARD/ : { *(.dynstr*) }
+ /DISCARD/ : { *(.dynamic*) }
+ /DISCARD/ : { *(.plt*) }
+ /DISCARD/ : { *(.interp*) }
+ /DISCARD/ : { *(.gnu*) }
+}
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