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riscv: Fix relocatable kernels with early alternatives using -fno-pie

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Early alternatives are called with the mmu disabled, and then should not
access any global symbols through the GOT since it requires relocations,
relocations that we do before but *virtually*. So only use medany code
model for this early code.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com> # booted on nezha & unmatched
Fixes: 39b33072941f ("riscv: Introduce CONFIG_RELOCATABLE")
Link: https://lore.kernel.org/r/20230526154630.289374-1-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Alexandre Ghiti 2023-05-26 17:46:30 +02:00 committed by Palmer Dabbelt
parent ed309ce522
commit 8dc2a7e802
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2 changed files with 8 additions and 0 deletions
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4
arch/riscv/errata/Makefile
View File

@ -1,2 +1,6 @@
ifdef CONFIG_RELOCATABLE
KBUILD_CFLAGS += -fno-pie
endif
obj-$(CONFIG_ERRATA_SIFIVE) += sifive/
obj-$(CONFIG_ERRATA_THEAD) += thead/

4
arch/riscv/kernel/Makefile
View File

@ -23,6 +23,10 @@ ifdef CONFIG_FTRACE
CFLAGS_REMOVE_alternative.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_cpufeature.o = $(CC_FLAGS_FTRACE)
endif
ifdef CONFIG_RELOCATABLE
CFLAGS_alternative.o += -fno-pie
CFLAGS_cpufeature.o += -fno-pie
endif
ifdef CONFIG_KASAN
KASAN_SANITIZE_alternative.o := n
KASAN_SANITIZE_cpufeature.o := n