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| author | Andre Przywara <andre.przywara@arm.com> | 2020-09-30 17:39:14 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2020-10-08 11:42:36 -0400 |
| commit | 9a984f100ed1d2d4a3aed7db9cfd1a3892e2bccd (patch) | |
| tree | ead0e6a3694bb5d4fe59e355dbfc0b2e2e6307dd /arch/arm/cpu/armv8 | |
| parent | eabc0902155aa36f603f628360706767202affb2 (diff) | |
| download | u-boot-9a984f100ed1d2d4a3aed7db9cfd1a3892e2bccd.tar.gz | |
arm64: PIE: Skip fixups if distance is zero
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>
Diffstat (limited to 'arch/arm/cpu/armv8')
| -rw-r--r-- | arch/arm/cpu/armv8/start.S | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S index e5c2856cf5..662449156b 100644 --- a/arch/arm/cpu/armv8/start.S +++ b/arch/arm/cpu/armv8/start.S @@ -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 */ |