diff options
| author | Ard Biesheuvel <ardb@kernel.org> | 2022-06-22 19:10:10 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2022-06-24 15:08:30 +0300 |
| commit | 1c9a8e87680870d5daf1eaa6314373dcc156ac15 (patch) | |
| tree | 7795f36f44351c6debfe7fc04d840d31ba3c9502 /arch/arm64/include/asm/fixmap.h | |
| parent | 47546a1912fc4a037035746998c3cfa740beed70 (diff) | |
| download | linux-1c9a8e87680870d5daf1eaa6314373dcc156ac15.tar.xz | |
arm64: entry: simplify trampoline data page
Get rid of some clunky open coded arithmetic on section addresses, by
emitting the trampoline data variables into a separate, dedicated r/o
data section, and putting it at the next page boundary. This way, we can
access the literals via single LDR instruction.
While at it, get rid of other, implicit literals, and use ADRP/ADD or
MOVZ/MOVK sequences, as appropriate. Note that the latter are only
supported for CONFIG_RELOCATABLE=n (which is usually the case if
CONFIG_RANDOMIZE_BASE=n), so update the CPP conditionals to reflect
this.
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20220622161010.3845775-1-ardb@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include/asm/fixmap.h')
| -rw-r--r-- | arch/arm64/include/asm/fixmap.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h index daff882883f9..71ed5fdf718b 100644 --- a/arch/arm64/include/asm/fixmap.h +++ b/arch/arm64/include/asm/fixmap.h @@ -62,10 +62,12 @@ enum fixed_addresses { #endif /* CONFIG_ACPI_APEI_GHES */ #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 +#ifdef CONFIG_RELOCATABLE + FIX_ENTRY_TRAMP_TEXT4, /* one extra slot for the data page */ +#endif FIX_ENTRY_TRAMP_TEXT3, FIX_ENTRY_TRAMP_TEXT2, FIX_ENTRY_TRAMP_TEXT1, - FIX_ENTRY_TRAMP_DATA, #define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT1)) #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ __end_of_permanent_fixed_addresses, |