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riscv: Hoist linker relaxation disabling logic into Kconfig 

Certain configurations may need to be disabled if linker relaxation is
in use, such as DWARF5 with ld.lld < 18. Hoist the logic of whether or
not linker relaxation is in use into Kconfig so decisions can be made at
configuration time.

Reviewed-by: Fangrui Song <maskray@google.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20231205-riscv-restrict-dwarf5-llvm-v2-1-aedf00a382ac@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Nathan Chancellor 2023-12-05 16:53:50 -07:00 committed by Palmer Dabbelt
parent b85ea95d08
commit 55b71d2ce1
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2 changed files with 6 additions and 3 deletions
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5
arch/riscv/Kconfig
View File

@ -181,6 +181,11 @@ config HAVE_SHADOW_CALL_STACK
# https://github.com/riscv-non-isa/riscv-elf-psabi-doc/commit/a484e843e6eeb51f0cb7b8819e50da6d2444d769
depends on $(ld-option,--no-relax-gp)
config RISCV_USE_LINKER_RELAXATION
def_bool y
# https://github.com/llvm/llvm-project/commit/6611d58f5bbcbec77262d392e2923e1d680f6985
depends on !LD_IS_LLD || LLD_VERSION >= 150000
config ARCH_MMAP_RND_BITS_MIN
default 18 if 64BIT
default 8

4
arch/riscv/Makefile
View File

@ -43,8 +43,7 @@ else
KBUILD_LDFLAGS += -melf32lriscv
endif
ifeq ($(CONFIG_LD_IS_LLD),y)
ifeq ($(call test-lt, $(CONFIG_LLD_VERSION), 150000),y)
ifndef CONFIG_RISCV_USE_LINKER_RELAXATION
KBUILD_CFLAGS += -mno-relax
KBUILD_AFLAGS += -mno-relax
ifndef CONFIG_AS_IS_LLVM
@ -52,7 +51,6 @@ ifndef CONFIG_AS_IS_LLVM
KBUILD_AFLAGS += -Wa,-mno-relax
endif
endif
endif
ifeq ($(CONFIG_SHADOW_CALL_STACK),y)
KBUILD_LDFLAGS += --no-relax-gp