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arm: arm64 32bit address relocation

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Current relocation code is limited to 21bit PC-relative addressing
which might not be enough for bigger code sizes. The following patch
increases the addressing to 32bit PC-relative. This feature is
specially interesting if U-Boot is build without optimiation (-O0) as
the text section is increased significativelly.

Signed-off-by: Ibai Erkiaga <ibai.erkiaga-elorza@xilinx.com>
This commit is contained in:
Ibai Erkiaga
2019-03-15 12:18:41 +00:00
committed by Tom Rini
parent aa2e9c9e80
commit 98ffbb78e1
1 changed files with 12 additions and 7 deletions
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19
arch/arm/lib/relocate_64.S
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@@ -26,9 +26,10 @@ ENTRY(relocate_code)
/* /*
* Copy u-boot from flash to RAM * Copy u-boot from flash to RAM
*/ */
adr x1, __image_copy_start /* x1 <- Run &__image_copy_start */ adrp x1, __image_copy_start /* x1 <- address bits [31:12] */
subs x9, x0, x1 /* x8 <- Run to copy offset */ add x1, x1, :lo12:__image_copy_start/* x1 <- address bits [11:00] */
b.eq relocate_done /* skip relocation */ subs x9, x0, x1 /* x9 <- Run to copy offset */
b.eq relocate_done /* skip relocation */
/* /*
* Don't ldr x1, __image_copy_start here, since if the code is already * Don't ldr x1, __image_copy_start here, since if the code is already
* running at an address other than it was linked to, that instruction * running at an address other than it was linked to, that instruction
@@ -42,8 +43,10 @@ ENTRY(relocate_code)
ldr x1, _TEXT_BASE /* x1 <- Linked &__image_copy_start */ ldr x1, _TEXT_BASE /* x1 <- Linked &__image_copy_start */
subs x9, x0, x1 /* x9 <- Link to copy offset */ subs x9, x0, x1 /* x9 <- Link to copy offset */
adr x1, __image_copy_start /* x1 <- Run &__image_copy_start */ adrp x1, __image_copy_start /* x1 <- address bits [31:12] */
adr x2, __image_copy_end /* x2 <- Run &__image_copy_end */ add x1, x1, :lo12:__image_copy_start/* x1 <- address bits [11:00] */
adrp x2, __image_copy_end /* x2 <- address bits [31:12] */
add x2, x2, :lo12:__image_copy_end /* x2 <- address bits [11:00] */
copy_loop: copy_loop:
ldp x10, x11, [x1], #16 /* copy from source address [x1] */ ldp x10, x11, [x1], #16 /* copy from source address [x1] */
stp x10, x11, [x0], #16 /* copy to target address [x0] */ stp x10, x11, [x0], #16 /* copy to target address [x0] */
@@ -54,8 +57,10 @@ copy_loop:
/* /*
* Fix .rela.dyn relocations * Fix .rela.dyn relocations
*/ */
adr x2, __rel_dyn_start /* x2 <- Run &__rel_dyn_start */ adrp x2, __rel_dyn_start /* x2 <- address bits [31:12] */
adr x3, __rel_dyn_end /* x3 <- Run &__rel_dyn_end */ add x2, x2, :lo12:__rel_dyn_start /* x2 <- address bits [11:00] */
adrp x3, __rel_dyn_end /* x3 <- address bits [31:12] */
add x3, x3, :lo12:__rel_dyn_end /* x3 <- address bits [11:00] */
fixloop: fixloop:
ldp x0, x1, [x2], #16 /* (x0,x1) <- (SRC location, fixup) */ ldp x0, x1, [x2], #16 /* (x0,x1) <- (SRC location, fixup) */
ldr x4, [x2], #8 /* x4 <- addend */ ldr x4, [x2], #8 /* x4 <- addend */