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FROMLIST: arm64: rust: Enable Rust support for AArch64

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This commit provides the build flags for Rust for AArch64. The core Rust
support already in the kernel does the rest. This enables the PAC ret
and BTI options in the Rust build flags to match the options that are
used when building C.

The Rust samples have been tested with this commit.

Bug: 308623796
Change-Id: I582e33974ff3db33aa3b331275137d6ce6a87556
Signed-off-by: Jamie Cunliffe <Jamie.Cunliffe@arm.com>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20231020155056.3495121-3-Jamie.Cunliffe@arm.com
[boqun: Resolve conflicts against loongarch]
Signed-off-by: Matthew Maurer <mmaurer@google.com>
This commit is contained in:
Jamie Cunliffe 2023-10-20 16:50:56 +01:00 committed by Treehugger Robot
parent adc9724f91
commit b802a765fb
5 changed files with 10 additions and 1 deletions
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1
Documentation/rust/arch-support.rst
View File

@ -15,6 +15,7 @@ support corresponds to ``S`` values in the ``MAINTAINERS`` file.
============ ================ ==============================================
Architecture Level of support Constraints
============ ================ ==============================================
``arm64`` Maintained Little Endian only.
``um`` Maintained ``x86_64`` only.
``x86`` Maintained ``x86_64`` only.
============ ================ ==============================================

1
arch/arm64/Kconfig
View File

@ -230,6 +230,7 @@ config ARM64
select HAVE_FUNCTION_ARG_ACCESS_API
select MMU_GATHER_RCU_TABLE_FREE
select HAVE_RSEQ
select HAVE_RUST if CPU_LITTLE_ENDIAN
select HAVE_STACKPROTECTOR
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_KPROBES

4
arch/arm64/Makefile
View File

@ -41,6 +41,8 @@ KBUILD_CFLAGS += -mgeneral-regs-only \
KBUILD_CFLAGS += $(call cc-disable-warning, psabi)
KBUILD_AFLAGS += $(compat_vdso)
KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon"
KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
@ -65,7 +67,9 @@ endif
ifeq ($(CONFIG_ARM64_BTI_KERNEL),y)
KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti
KBUILD_RUSTFLAGS += -Zbranch-protection=bti,pac-ret
else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y)
KBUILD_RUSTFLAGS += -Zbranch-protection=pac-ret
ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y)
KBUILD_CFLAGS += -mbranch-protection=pac-ret
else

1
rust/Makefile
View File

@ -296,6 +296,7 @@ bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
# Derived from `scripts/Makefile.clang`.
BINDGEN_TARGET_x86 := x86_64-linux-gnu
BINDGEN_TARGET_arm64 := aarch64-linux-gnu
BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH))
# All warnings are inhibited since GCC builds are very experimental,

4
scripts/generate_rust_target.rs
View File

@ -148,7 +148,9 @@ fn main() {
let mut ts = TargetSpec::new();
// `llvm-target`s are taken from `scripts/Makefile.clang`.
if cfg.has("X86_64") {
if cfg.has("ARM64") {
panic!("arm64 uses the builtin rustc aarch64-unknown-none target");
} else if cfg.has("X86_64") {
ts.push("arch", "x86_64");
ts.push(
"data-layout",