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- /*
- * relocate - common relocation function for ARM U-Boot
- *
- * Copyright (c) 2013 Albert ARIBAUD <albert.u.boot@aribaud.net>
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
- #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)
- ldr r1, =__image_copy_start /* r1 <- SRC &__image_copy_start */
- subs r4, r0, r1 /* r4 <- relocation offset */
- beq relocate_done /* skip relocation */
- ldr r2, =__image_copy_end /* r2 <- SRC &__image_copy_end */
- copy_loop:
- ldmia r1!, {r10-r11} /* copy from source address [r1] */
- stmia r0!, {r10-r11} /* copy to target address [r0] */
- cmp r1, 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:
- ldmia r2!, {r0-r1} /* (r0,r1) <- (SRC location,fixup) */
- and r1, r1, #0xff
- cmp r1, #23 /* relative fixup? */
- bne fixnext
- /* relative fix: increase location by offset */
- add r0, r0, r4
- ldr r1, [r0]
- add r1, r1, r4
- str r1, [r0]
- fixnext:
- cmp r2, r3
- blo fixloop
- relocate_done:
- #ifdef __XSCALE__
- /*
- * On xscale, icache must be invalidated and write buffers drained,
- * even with cache disabled - 4.2.7 of xscale core developer's manual
- */
- mcr p15, 0, r0, c7, c7, 0 /* invalidate icache */
- mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */
- #endif
- /* 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)
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