diff options
| author | Ibai Erkiaga <ibai.erkiaga-elorza@xilinx.com> | 2019-03-15 12:18:41 +0000 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2019-04-22 18:13:24 -0400 |
| commit | 98ffbb78e12646a1d06236ad6a1893217f255aae (patch) | |
| tree | 87b0dbfe41ca3cddac870718d879d989f5e22418 /arch | |
| parent | aa2e9c9e80916218c6e6036a848374c4ae4fdc87 (diff) | |
| download | u-boot-98ffbb78e12646a1d06236ad6a1893217f255aae.tar.gz | |
arm: arm64 32bit address relocation
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/lib/relocate_64.S | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/arch/arm/lib/relocate_64.S b/arch/arm/lib/relocate_64.S index 7603f52774..26d29c5324 100644 --- a/arch/arm/lib/relocate_64.S +++ b/arch/arm/lib/relocate_64.S @@ -26,9 +26,10 @@ ENTRY(relocate_code) /* * Copy u-boot from flash to RAM */ - adr x1, __image_copy_start /* x1 <- Run &__image_copy_start */ - subs x9, x0, x1 /* x8 <- Run to copy offset */ - b.eq relocate_done /* skip relocation */ + adrp x1, __image_copy_start /* x1 <- address bits [31:12] */ + add x1, x1, :lo12:__image_copy_start/* x1 <- address bits [11:00] */ + 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 * 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 */ subs x9, x0, x1 /* x9 <- Link to copy offset */ - adr x1, __image_copy_start /* x1 <- Run &__image_copy_start */ - adr x2, __image_copy_end /* x2 <- Run &__image_copy_end */ + adrp x1, __image_copy_start /* x1 <- address bits [31:12] */ + 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: ldp x10, x11, [x1], #16 /* copy from source address [x1] */ stp x10, x11, [x0], #16 /* copy to target address [x0] */ @@ -54,8 +57,10 @@ copy_loop: /* * Fix .rela.dyn relocations */ - adr x2, __rel_dyn_start /* x2 <- Run &__rel_dyn_start */ - adr x3, __rel_dyn_end /* x3 <- Run &__rel_dyn_end */ + adrp x2, __rel_dyn_start /* x2 <- address bits [31:12] */ + 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: ldp x0, x1, [x2], #16 /* (x0,x1) <- (SRC location, fixup) */ ldr x4, [x2], #8 /* x4 <- addend */ |