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arm64: Trap PIE builds early if load address is not 4K aligned

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PIE requires a 4K aligned load address. If this is not met, trap
the startup sequence in a WFI loop rather than running into obscure
failures.

Tested-by: Michal Simek <michal.simek@xilinx.com>
Suggested-by: André Przywara <andre.przywara@arm.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Edgar E. Iglesias 2020-09-09 19:07:25 +02:00 committed by Michal Simek
parent 11f4fbf0d4
commit 04d13b5d09
1 changed files with 17 additions and 0 deletions
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17
arch/arm/cpu/armv8/start.S
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@ -59,6 +59,23 @@ reset:
save_boot_params_ret:
#if CONFIG_POSITION_INDEPENDENT
/* Verify that we're 4K aligned. */
adr x0, _start
ands x0, x0, #0xfff
b.eq 1f
0:
/*
* FATAL, can't continue.
* U-Boot needs to be loaded at a 4K aligned address.
*
* We use ADRP and ADD to load some symbol addresses during startup.
* The ADD uses an absolute (non pc-relative) lo12 relocation
* thus requiring 4K alignment.
*/
wfi
b 0b
1:
/*
* Fix .rela.dyn relocations. This allows U-Boot to be loaded to and
* executed at a different address than it was linked at.