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| author | Ard Biesheuvel <ardb@kernel.org> | 2021-11-24 20:56:22 +0300 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2021-12-06 14:49:16 +0300 |
| commit | 1fa8c4b19543ae8c8894ec92a18696c9f9b03fc8 (patch) | |
| tree | cc6a2f523338f66bf6b59be8b91e3433e0f9baa4 /arch/arm/include/asm/elf.h | |
| parent | 831a469bc1674b7898984ce96f2902534445c0cf (diff) | |
| download | linux-1fa8c4b19543ae8c8894ec92a18696c9f9b03fc8.tar.xz | |
ARM: module: implement support for PC-relative group relocations
Add support for the R_ARM_ALU_PC_Gn_NC and R_ARM_LDR_PC_G2 group
relocations [0] so we can use them in modules. These will be used to
load the current task pointer from a global variable without having to
rely on a literal pool entry to carry the address of this variable,
which may have a significant negative impact on cache utilization for
variables that are used often and in many different places, as each
occurrence will result in a literal pool entry and therefore a line in
the D-cache.
[0] 'ELF for the ARM architecture'
https://github.com/ARM-software/abi-aa/releases
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Marc Zyngier <maz@kernel.org>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
Diffstat (limited to 'arch/arm/include/asm/elf.h')
| -rw-r--r-- | arch/arm/include/asm/elf.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/include/asm/elf.h b/arch/arm/include/asm/elf.h index b8102a6ddf16..d68101655b74 100644 --- a/arch/arm/include/asm/elf.h +++ b/arch/arm/include/asm/elf.h @@ -61,6 +61,9 @@ typedef struct user_fp elf_fpregset_t; #define R_ARM_MOVT_ABS 44 #define R_ARM_MOVW_PREL_NC 45 #define R_ARM_MOVT_PREL 46 +#define R_ARM_ALU_PC_G0_NC 57 +#define R_ARM_ALU_PC_G1_NC 59 +#define R_ARM_LDR_PC_G2 63 #define R_ARM_THM_CALL 10 #define R_ARM_THM_JUMP24 30 |