mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 07:34:31 +00:00
47bd65ef05
This change is only done where needed: some linker scripts may contain relocation symbols yet remain unchanged. __rel_dyn_start and __rel_dyn_end each requires its own output section; putting them in relocation sections changes their flags and breaks relocation. Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net> Tested-by: Lubomir Popov <lpopov@mm-sol.com> Tested-by: Jeroen Hofstee <jeroen@myspectrum.nl> Reviewed-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
89 lines
2.7 KiB
ArmAsm
89 lines
2.7 KiB
ArmAsm
/*
|
|
* relocate - common relocation function for ARM U-Boot
|
|
*
|
|
* Copyright (c) 2013 Albert ARIBAUD <albert.u.boot@aribaud.net>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
/*
|
|
* void relocate_code(addr_moni)
|
|
*
|
|
* This function relocates the monitor code.
|
|
*
|
|
* NOTE:
|
|
* To prevent the code below from containing references with an R_ARM_ABS32
|
|
* relocation record type, we never refer to linker-defined symbols directly.
|
|
* Instead, we declare literals which contain their relative location with
|
|
* respect to relocate_code, and at run time, add relocate_code back to them.
|
|
*/
|
|
|
|
ENTRY(relocate_code)
|
|
mov r6, r0 /* save addr of destination */
|
|
|
|
ldr r0, =__image_copy_start /* r0 <- SRC &__image_copy_start */
|
|
subs r9, r6, r0 /* r9 <- relocation offset */
|
|
beq relocate_done /* skip relocation */
|
|
mov r1, r6 /* r1 <- scratch for copy loop */
|
|
adr r7, relocate_code /* r7 <- SRC &relocate_code */
|
|
ldr r2, =__image_copy_end /* r2 <- SRC &__image_copy_end */
|
|
|
|
copy_loop:
|
|
ldmia r0!, {r10-r11} /* copy from source address [r0] */
|
|
stmia r1!, {r10-r11} /* copy to target address [r1] */
|
|
cmp r0, r2 /* until source end address [r2] */
|
|
blo copy_loop
|
|
|
|
/*
|
|
* fix .rel.dyn relocations
|
|
*/
|
|
ldr r2, =__rel_dyn_start /* r2 <- SRC &__rel_dyn_start */
|
|
ldr r3, =__rel_dyn_end /* r3 <- SRC &__rel_dyn_end */
|
|
fixloop:
|
|
ldr r0, [r2] /* r0 <- SRC location to fix up */
|
|
add r0, r0, r9 /* r0 <- DST location to fix up */
|
|
ldr r1, [r2, #4]
|
|
and r7, r1, #0xff
|
|
cmp r7, #23 /* relative fixup? */
|
|
beq fixrel
|
|
/* ignore unknown type of fixup */
|
|
b fixnext
|
|
fixrel:
|
|
/* relative fix: increase location by offset */
|
|
ldr r1, [r0]
|
|
add r1, r1, r9
|
|
fixnext:
|
|
str r1, [r0]
|
|
add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
|
|
cmp r2, r3
|
|
blo fixloop
|
|
|
|
relocate_done:
|
|
|
|
/* ARMv4- don't know bx lr but the assembler fails to see that */
|
|
|
|
#ifdef __ARM_ARCH_4__
|
|
mov pc, lr
|
|
#else
|
|
bx lr
|
|
#endif
|
|
|
|
ENDPROC(relocate_code)
|