upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
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112 lines
3.5 KiB
112 lines
3.5 KiB
/*
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* relocate - common relocation function for ARM U-Boot
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*
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* Copyright (c) 2013 Albert ARIBAUD <albert.u.boot@aribaud.net>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <linux/linkage.h>
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/*
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* void relocate_code(addr_moni)
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*
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* This function relocates the monitor code.
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*
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* NOTE:
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* To prevent the code below from containing references with an R_ARM_ABS32
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* relocation record type, we never refer to linker-defined symbols directly.
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* Instead, we declare literals which contain their relative location with
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* respect to relocate_code, and at run time, add relocate_code back to them.
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*/
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ENTRY(relocate_code)
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mov r6, r0 /* save addr of destination */
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ldr r0, =_start /* r0 <- SRC &_start */
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subs r9, r6, r0 /* r9 <- relocation offset */
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beq relocate_done /* skip relocation */
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mov r1, r6 /* r1 <- scratch for copy loop */
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adr r7, relocate_code /* r7 <- SRC &relocate_code */
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ldr r3, _image_copy_end_ofs /* r3 <- __image_copy_end local ofs */
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add r2, r7, r3 /* r2 <- SRC &__image_copy_end */
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copy_loop:
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ldmia r0!, {r10-r11} /* copy from source address [r0] */
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stmia r1!, {r10-r11} /* copy to target address [r1] */
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cmp r0, r2 /* until source end address [r2] */
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blo copy_loop
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/*
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* fix .rel.dyn relocations
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*/
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ldr r10, _dynsym_start_ofs /* r10 <- __dynsym_start local ofs */
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add r10, r10, r7 /* r10 <- SRC &__dynsym_start */
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ldr r2, _rel_dyn_start_ofs /* r2 <- __rel_dyn_start local ofs */
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add r2, r2, r7 /* r2 <- SRC &__rel_dyn_start */
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ldr r3, _rel_dyn_end_ofs /* r3 <- __rel_dyn_end local ofs */
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add r3, r3, r7 /* r3 <- SRC &__rel_dyn_end */
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fixloop:
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ldr r0, [r2] /* r0 <- SRC location to fix up */
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add r0, r0, r9 /* r0 <- DST location to fix up */
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ldr r1, [r2, #4]
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and r7, r1, #0xff
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cmp r7, #23 /* relative fixup? */
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beq fixrel
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cmp r7, #2 /* absolute fixup? */
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beq fixabs
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/* ignore unknown type of fixup */
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b fixnext
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fixabs:
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/* absolute fix: set location to (offset) symbol value */
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mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */
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add r1, r10, r1 /* r1 <- address of symbol in table */
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ldr r1, [r1, #4] /* r1 <- symbol value */
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add r1, r1, r9 /* r1 <- relocated sym addr */
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b fixnext
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fixrel:
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/* relative fix: increase location by offset */
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ldr r1, [r0]
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add r1, r1, r9
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fixnext:
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str r1, [r0]
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add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
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cmp r2, r3
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blo fixloop
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relocate_done:
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/* ARMv4- don't know bx lr but the assembler fails to see that */
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#ifdef __ARM_ARCH_4__
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mov pc, lr
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#else
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bx lr
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#endif
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_image_copy_end_ofs:
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.word __image_copy_end - relocate_code
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_rel_dyn_start_ofs:
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.word __rel_dyn_start - relocate_code
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_rel_dyn_end_ofs:
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.word __rel_dyn_end - relocate_code
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_dynsym_start_ofs:
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.word __dynsym_start - relocate_code
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ENDPROC(relocate_code)
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