barebox/arch/ppc/mach-mpc85xx/barebox.lds.S
Juergen Borleis a23eb47bf2 PPC: fix size optimisation
Since patch e92abad363 the linker discards sections which seems not
used to make the image smaller.
But this change will discard the whole init and exception code from start.S
which renders the final image useless.

From 'barebox.map' without this patch:

Discarded input sections
 .text          0x0000000000000000     0x358c arch/ppc/mach-mpc5xxx/start.o
 .data          0x0000000000000000        0x0 arch/ppc/mach-mpc5xxx/start.o
 .bss           0x0000000000000000        0x0 arch/ppc/mach-mpc5xxx/start.o
 .got2          0x0000000000000000       0x24 arch/ppc/mach-mpc5xxx/start.o
[...]

So, define the entry point to mark the init and exception used.

From 'barebox.map' with this patch applied:

Discarded input sections
 .data          0x0000000000000000        0x0 arch/ppc/mach-mpc5xxx/start.o
 .bss           0x0000000000000000        0x0 arch/ppc/mach-mpc5xxx/start.o
[...]

Note: tested on MPC5200 at run time, for MPC85XX compile time only

Signed-off-by: Juergen Borleis <jbe@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2016-05-30 07:07:48 +02:00

171 lines
3.8 KiB
ArmAsm

/*
* Copyright 2013 GE Intelligent Platforms, Inc.
* Copyright 2007-2009, 2011 Freescale Semiconductor, Inc.
*
* 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.
*/
#include <asm-generic/barebox.lds.h>
#ifdef CONFIG_RESET_VECTOR_ADDRESS
#define RESET_VECTOR_ADDRESS CONFIG_RESET_VECTOR_ADDRESS
#else
#define RESET_VECTOR_ADDRESS 0xfffffffc
#endif
OUTPUT_ARCH("powerpc")
ENTRY(_start_e500)
PHDRS
{
text PT_LOAD;
bss PT_LOAD;
}
SECTIONS
{
. = TEXT_BASE;
_stext = .;
PROVIDE (stext = .);
.interp : { *(.interp) }
.hash : { *(.hash) }
.dynsym : { *(.dynsym) }
.dynstr : { *(.dynstr) }
.rel.text : { *(.rel.text) }
.rela.text : { *(.rela.text) }
.rel.data : { *(.rel.data) }
.rela.data : { *(.rela.data) }
.rel.rodata : { *(.rel.rodata) }
.rela.rodata : { *(.rela.rodata)}
.rel.got : { *(.rel.got) }
.rela.got : { *(.rela.got) }
.rel.ctors : { *(.rel.ctors) }
.rela.ctors : { *(.rela.ctors) }
.rel.dtors : { *(.rel.dtors) }
.rela.dtors : { *(.rela.dtors) }
.rel.bss : { *(.rel.bss) }
.rela.bss : { *(.rela.bss) }
.rel.plt : { *(.rel.plt) }
.rela.plt : { *(.rela.plt) }
.init : { *(.init) }
.plt : { *(.plt) }
.text :
{
*(.text*)
*(.got1*)
} :text
_etext = .;
PROVIDE (etext = .);
_sdata = .;
.rodata :
{
*(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*)))
} :text
/* Read-write section, merged into data segment: */
. = (. + 0x00FF) & 0xFFFFFF00;
_erotext = .;
PROVIDE (erotext = .);
.reloc :
{
KEEP(*(.got))
_GOT2_TABLE_ = .;
KEEP(*(.got2))
PROVIDE(_GLOBAL_OFFSET_TABLE_ = . + 4);
_FIXUP_TABLE_ = .;
KEEP(*(.fixup))
}
__got2_entries = ((_FIXUP_TABLE_ - _GOT2_TABLE_) >> 2);
__fixup_entries = (. - _FIXUP_TABLE_) >> 2;
.data :
{
*(.data*)
*(.data1*)
*(.sdata*)
*(.sdata2*)
*(.dynamic*)
CONSTRUCTORS
}
. = .;
__barebox_cmd_start = .;
.barebox_cmd : { BAREBOX_CMDS }
__barebox_cmd_end = .;
__barebox_initcalls_start = .;
.barebox_initcalls : { INITCALLS }
__barebox_initcalls_end = .;
__initcall_entries = (__barebox_initcalls_end - __barebox_initcalls_start)>>2;
__barebox_exitcalls_start = .;
.barebox_exitcalls : { EXITCALLS }
__barebox_exitcalls_end = .;
__exitcall_entries = (__barebox_exitcalls_end - __barebox_exitcalls_start) >> 2;
__usymtab_start = .;
__usymtab : { BAREBOX_SYMS }
__usymtab_end = .;
. = .;
__start___ex_table = .;
__ex_table : { *(__ex_table) }
__stop___ex_table = .;
_edata = .;
PROVIDE (edata = .);
. = ALIGN(256);
__init_begin = .;
.text.init : { *(.text.init) }
.data.init : { *(.data.init) }
. = ALIGN(256);
__init_end = .;
__init_size = __init_end - _start;
.bootpg RESET_VECTOR_ADDRESS - 0xffc :
{
_text = .;
arch/ppc/cpu-85xx/start.o (.bootpg)
} :text = 0xffff
.resetvec RESET_VECTOR_ADDRESS :
{
KEEP(*(.resetvec))
arch/ppc/cpu-85xx/resetvec.o (.resetvec)
} :text = 0xffff
. = RESET_VECTOR_ADDRESS + 0x4;
#if (RESET_VECTOR_ADDRESS == 0xfffffffc)
/* This avoids wrapping around to offset 0 */
. |= 0x10;
#endif
__bss_start = .;
.bss :
{
*(.sbss*) *(.scommon*)
*(.dynbss*)
*(.bss*)
*(COMMON)
} :bss
. = ALIGN(4);
__bss_stop = .;
_end = . ;
PROVIDE (end = .);
}