projects / thirdparty / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 3da0e575 AA |
1 | /* |
| 2 | * relocate - common relocation function for ARM U-Boot | |
| 3 | * | |
| 4 | * Copyright (c) 2013 Albert ARIBAUD <albert.u.boot@aribaud.net> | |
| 5 | * | |
| 1a459660 | 6 | * SPDX-License-Identifier: GPL-2.0+ |
| 3da0e575 AA |
7 | */ |
| 8 | ||
| 9 | #include <linux/linkage.h> | |
| 10 | ||
| 11 | /* | |
| 12 | * void relocate_code(addr_moni) | |
| 13 | * | |
| 14 | * This function relocates the monitor code. | |
| 15 | * | |
| 16 | * NOTE: | |
| 17 | * To prevent the code below from containing references with an R_ARM_ABS32 | |
| 18 | * relocation record type, we never refer to linker-defined symbols directly. | |
| 19 | * Instead, we declare literals which contain their relative location with | |
| 20 | * respect to relocate_code, and at run time, add relocate_code back to them. | |
| 21 | */ | |
| 22 | ||
| 23 | ENTRY(relocate_code) | |
| fbf87b18 AA |
24 | ldr r1, =__image_copy_start /* r1 <- SRC &__image_copy_start */ |
| 25 | subs r9, r0, r1 /* r9 <- relocation offset */ | |
| 3da0e575 | 26 | beq relocate_done /* skip relocation */ |
| d026dec8 | 27 | ldr r2, =__image_copy_end /* r2 <- SRC &__image_copy_end */ |
| 3da0e575 AA |
28 | |
| 29 | copy_loop: | |
| fbf87b18 AA |
30 | ldmia r1!, {r10-r11} /* copy from source address [r1] */ |
| 31 | stmia r0!, {r10-r11} /* copy to target address [r0] */ | |
| 32 | cmp r1, r2 /* until source end address [r2] */ | |
| 3da0e575 AA |
33 | blo copy_loop |
| 34 | ||
| 35 | /* | |
| 36 | * fix .rel.dyn relocations | |
| 37 | */ | |
| 47bd65ef AA |
38 | ldr r2, =__rel_dyn_start /* r2 <- SRC &__rel_dyn_start */ |
| 39 | ldr r3, =__rel_dyn_end /* r3 <- SRC &__rel_dyn_end */ | |
| 3da0e575 | 40 | fixloop: |
| fbf87b18 AA |
41 | ldmia r2!, {r0-r1} /* (r0,r1) <- (SRC location,fixup) */ |
| 42 | and r1, r1, #0xff | |
| 43 | cmp r1, #23 /* relative fixup? */ | |
| 44 | bne fixnext | |
| 45 | ||
| 3da0e575 | 46 | /* relative fix: increase location by offset */ |
| fbf87b18 | 47 | add r0, r0, r9 |
| 3da0e575 AA |
48 | ldr r1, [r0] |
| 49 | add r1, r1, r9 | |
| 3da0e575 | 50 | str r1, [r0] |
| fbf87b18 | 51 | fixnext: |
| 3da0e575 AA |
52 | cmp r2, r3 |
| 53 | blo fixloop | |
| 54 | ||
| 55 | relocate_done: | |
| 56 | ||
| 9dc8fef2 MD |
57 | #ifdef __XSCALE__ |
| 58 | /* | |
| 59 | * On xscale, icache must be invalidated and write buffers drained, | |
| 60 | * even with cache disabled - 4.2.7 of xscale core developer's manual | |
| 61 | */ | |
| 62 | mcr p15, 0, r0, c7, c7, 0 /* invalidate icache */ | |
| 63 | mcr p15, 0, r0, c7, c10, 4 /* drain write buffer */ | |
| 64 | #endif | |
| 65 | ||
| 3da0e575 AA |
66 | /* ARMv4- don't know bx lr but the assembler fails to see that */ |
| 67 | ||
| 68 | #ifdef __ARM_ARCH_4__ | |
| 69 | mov pc, lr | |
| 70 | #else | |
| 71 | bx lr | |
| 72 | #endif | |
| 73 | ||
| 3da0e575 | 74 | ENDPROC(relocate_code) |