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arm64: PIE: Skip fixups if distance is zero

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When the actual offset between link and runtime address is zero, there
is no need for patching up U-Boot early when running with
CONFIG_POSITION_INDEPENDENT.

Skip the whole routine when the distance is 0.

This helps when U-Boot is loaded into ROM, or in otherwise sensitive
memory locations.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Andre Przywara 2020-09-30 17:39:14 +01:00 committed by Tom Rini
parent eabc090215
commit 9a984f100e
1 changed files with 2 additions and 1 deletions
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3
arch/arm/cpu/armv8/start.S
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@ -83,7 +83,8 @@ save_boot_params_ret:
pie_fixup:
adr x0, _start /* x0 <- Runtime value of _start */
ldr x1, _TEXT_BASE /* x1 <- Linked value of _start */
sub x9, x0, x1 /* x9 <- Run-vs-link offset */
subs x9, x0, x1 /* x9 <- Run-vs-link offset */
beq pie_fixup_done
adrp x2, __rel_dyn_start /* x2 <- Runtime &__rel_dyn_start */
add x2, x2, #:lo12:__rel_dyn_start
adrp x3, __rel_dyn_end /* x3 <- Runtime &__rel_dyn_end */