[PATCH v3 0/5] LoongArch: Add kernel relocation and KASLR support
From: Xi Ruoyao
Date: Wed Feb 08 2023 - 12:16:36 EST
This patch series to support kernel relocation and KASLR (only 64bit).
Tested the kernel images built with new toolchain (Binutils-2.40 + patched
GCC-12.2) and old toolchain (kernel.org cross toolchain [1]) on a
3A5000-7A2000-EVB.
With CONFIG_RANDOMIZE_BASE=y, the results are:
1. first boot, new toolchain:
$ sudo cat /proc/iomem | grep Kernel
01080000-0189ffff : Kernel code
018a0000-01deb5ff : Kernel data
01deb600-01ef6e9f : Kernel bss
2. second boot, new toolchain:
$ sudo cat /proc/iomem | grep Kernel
012f0000-01b0ffff : Kernel code
01b10000-0205b5ff : Kernel data
0205b600-02166e9f : Kernel bss
3. first boot, old toolchain:
010e0000-018fffff : Kernel code
01900000-01e591ff : Kernel data
01e59200-01f56dcf : Kernel bss
4. second boot, old toolchain:
010b0000-018cffff : Kernel code
018d0000-01e291ff : Kernel data
01e29200-01f26dcf : Kernel bss
Changes from v2:
- Correctly fixup pcaddi12i/ori/lu32i.d/lu52i.d sequence generated by
GNU as <= 2.39 for la.pcrel.
Changes from v1 to v2:
- Relocate the handlers instead of using a trampoline, to avoid
performance issue on NUMA systems.
- Fix compiler warnings.
Xi Ruoyao (2):
LoongArch: Use la.pcrel instead of la.abs when it's trivially possible
LoongArch: Use la.pcrel instead of la.abs for exception handlers
Youling Tang (3):
LoongArch: Add JUMP_LINK_ADDR macro implementation to avoid using
la.abs
LoongArch: Add support for kernel relocation
LoongArch: Add support for kernel address space layout randomization
(KASLR)
arch/loongarch/Kconfig | 37 +++++
arch/loongarch/Makefile | 5 +
arch/loongarch/include/asm/inst.h | 1 +
arch/loongarch/include/asm/page.h | 6 +
arch/loongarch/include/asm/setup.h | 6 +-
arch/loongarch/include/asm/stackframe.h | 13 +-
arch/loongarch/include/asm/uaccess.h | 1 -
arch/loongarch/kernel/Makefile | 2 +
arch/loongarch/kernel/entry.S | 2 +-
arch/loongarch/kernel/genex.S | 40 ++++-
arch/loongarch/kernel/head.S | 30 +++-
arch/loongarch/kernel/relocate.c | 211 ++++++++++++++++++++++++
arch/loongarch/kernel/setup.c | 3 +
arch/loongarch/kernel/traps.c | 158 +++++++++++++++---
arch/loongarch/kernel/vmlinux.lds.S | 11 +-
arch/loongarch/mm/tlb.c | 23 +--
arch/loongarch/mm/tlbex.S | 72 +++++++-
arch/loongarch/power/suspend_asm.S | 5 +-
18 files changed, 564 insertions(+), 62 deletions(-)
create mode 100644 arch/loongarch/kernel/relocate.c
--
2.39.1