riscv: Introduce CONFIG_RELOCATABLE

Browse source

This config allows to compile 64b kernel as PIE and to relocate it at
any virtual address at runtime: this paves the way to KASLR.
Runtime relocation is possible since relocation metadata are embedded into
the kernel.

Note that relocating at runtime introduces an overhead even if the
kernel is loaded at the same address it was linked at and that the compiler
options are those used in arm64 which uses the same RELA relocation
format.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20230329045329.64565-4-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

...

This commit is contained in:

Alexandre Ghiti 2023-03-29 06:53:26 +02:00 • committed by Palmer Dabbelt

parent 69a90d2fe1

commit 39b3307294

No known key found for this signature in database

GPG key ID: 2E1319F35FBB1889

5 changed files with 91 additions and 5 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

14

arch/riscv/Kconfig

View file

7

arch/riscv/Makefile

View file

17

arch/riscv/kernel/vmlinux.lds.S

View file

4

arch/riscv/mm/Makefile

View file

54

arch/riscv/mm/init.c

View file