summaryrefslogtreecommitdiff
path: root/arch/arm/lib/relocate.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/lib/relocate.S')
-rw-r--r--arch/arm/lib/relocate.S61
1 files changed, 15 insertions, 46 deletions
diff --git a/arch/arm/lib/relocate.S b/arch/arm/lib/relocate.S
index 4446da9..949b9e8 100644
--- a/arch/arm/lib/relocate.S
+++ b/arch/arm/lib/relocate.S
@@ -37,56 +37,34 @@
*/
ENTRY(relocate_code)
- mov r6, r0 /* save addr of destination */
-
- ldr r0, =_start /* r0 <- SRC &_start */
- subs r9, r6, r0 /* r9 <- relocation offset */
+ ldr r1, =__image_copy_start /* r1 <- SRC &__image_copy_start */
+ subs r9, r0, r1 /* 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 r3, _image_copy_end_ofs /* r3 <- __image_copy_end local ofs */
- add r2, r7, r3 /* r2 <- SRC &__image_copy_end */
+ 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] */
+ 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 r10, _dynsym_start_ofs /* r10 <- __dynsym_start local ofs */
- add r10, r10, r7 /* r10 <- SRC &__dynsym_start */
- ldr r2, _rel_dyn_start_ofs /* r2 <- __rel_dyn_start local ofs */
- add r2, r2, r7 /* r2 <- SRC &__rel_dyn_start */
- ldr r3, _rel_dyn_end_ofs /* r3 <- __rel_dyn_end local ofs */
- add r3, r3, r7 /* r3 <- SRC &__rel_dyn_end */
+ 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
- cmp r7, #2 /* absolute fixup? */
- beq fixabs
- /* ignore unknown type of fixup */
- b fixnext
-fixabs:
- /* absolute fix: set location to (offset) symbol value */
- mov r1, r1, LSR #4 /* r1 <- symbol index in .dynsym */
- add r1, r10, r1 /* r1 <- address of symbol in table */
- ldr r1, [r1, #4] /* r1 <- symbol value */
- add r1, r1, r9 /* r1 <- relocated sym addr */
- b fixnext
-fixrel:
+ 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, r9
ldr r1, [r0]
add r1, r1, r9
-fixnext:
str r1, [r0]
- add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
+fixnext:
cmp r2, r3
blo fixloop
@@ -100,13 +78,4 @@ relocate_done:
bx lr
#endif
-_image_copy_end_ofs:
- .word __image_copy_end - relocate_code
-_rel_dyn_start_ofs:
- .word __rel_dyn_start - relocate_code
-_rel_dyn_end_ofs:
- .word __rel_dyn_end - relocate_code
-_dynsym_start_ofs:
- .word __dynsym_start - relocate_code
-
ENDPROC(relocate_code)