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Subject[PATCH v6 0/5] LoongArch: Add kernel relocation and KASLR support
Date
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 v5:
- Fix relocate_la_abs.
- Other minor modifications.

Changes from v4:
- Add la_abs macro implementation.
- Remove patch2 (LoongArch: Use la.pcrel instead of la.abs for exception
handlers).
- Remove SYS_SUPPORTS_RELOCATABLE.
- Fix do_kaslr.
- Fix compiler warnings.
- Move some declarations and struct definitions to setup.h.

Changes from v3:

- JUMP_LINK_ADDR renamed to JUMP_VIRT_ADDR, and use the way of parameter
passing.
- Reimplement kernel relocation, when the link address and load address
are different, realize the effect of adaptive relocation (one of the
usage scenarios is kdump operation).
- Reimplement KASLR.

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 (1):
LoongArch: Use la.pcrel instead of la.abs when it's trivially possible

Youling Tang (4):
LoongArch: Add JUMP_VIRT_ADDR macro implementation to avoid using
la.abs
LoongArch: Add la_abs macro implementation
LoongArch: Add support for kernel relocation
LoongArch: Add support for kernel address space layout randomization
(KASLR)

arch/loongarch/Kconfig | 31 +++
arch/loongarch/Makefile | 5 +
arch/loongarch/include/asm/asmmacro.h | 17 ++
arch/loongarch/include/asm/setup.h | 16 ++
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 | 8 +-
arch/loongarch/kernel/head.S | 31 ++-
arch/loongarch/kernel/relocate.c | 245 ++++++++++++++++++++++++
arch/loongarch/kernel/vmlinux.lds.S | 20 +-
arch/loongarch/mm/tlbex.S | 17 +-
arch/loongarch/power/suspend_asm.S | 5 +-
14 files changed, 382 insertions(+), 31 deletions(-)
create mode 100644 arch/loongarch/kernel/relocate.c

--
2.37.3

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