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-rw-r--r--Documentation/rust/arch-support.rst1
-rw-r--r--arch/arm/Kconfig3
-rw-r--r--arch/arm/Makefile1
-rw-r--r--arch/arm/include/asm/vmlinux.lds.h14
-rw-r--r--arch/arm/kernel/smp.c3
-rw-r--r--arch/arm/kernel/vmlinux-xip.lds.S2
-rw-r--r--arch/arm/kernel/vmlinux.lds.S2
-rw-r--r--drivers/clk/clkdev.c9
-rw-r--r--init/Kconfig5
-rw-r--r--rust/Makefile8
-rw-r--r--rust/compiler_builtins.rs24
-rw-r--r--scripts/generate_rust_target.rs4
12 files changed, 62 insertions, 14 deletions
diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst
index 54be7ddf3e57..6e6a515d0899 100644
--- a/Documentation/rust/arch-support.rst
+++ b/Documentation/rust/arch-support.rst
@@ -15,6 +15,7 @@ support corresponds to ``S`` values in the ``MAINTAINERS`` file.
============= ================ ==============================================
Architecture Level of support Constraints
============= ================ ==============================================
+``arm`` Maintained ARMv7 Little Endian only.
``arm64`` Maintained Little Endian only.
``loongarch`` Maintained \-
``riscv`` Maintained ``riscv64`` and LLVM/Clang only.
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 835b5f100e92..25ed6f1a7c7a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -121,7 +121,7 @@ config ARM
select HAVE_KERNEL_XZ
select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
select HAVE_KRETPROBES if HAVE_KPROBES
- select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if (LD_VERSION >= 23600 || LD_IS_LLD)
+ select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if (LD_VERSION >= 23600 || LD_CAN_USE_KEEP_IN_OVERLAY)
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_NMI
select HAVE_OPTPROBES if !THUMB2_KERNEL
@@ -133,6 +133,7 @@ config ARM
select MMU_GATHER_RCU_TABLE_FREE if SMP && ARM_LPAE
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RSEQ
+ select HAVE_RUST if CPU_LITTLE_ENDIAN && CPU_32v7
select HAVE_STACKPROTECTOR
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_UID16
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 00ca7886b18e..4808d3ed98e4 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -150,6 +150,7 @@ endif
KBUILD_CPPFLAGS +=$(cpp-y)
KBUILD_CFLAGS +=$(CFLAGS_ABI) $(CFLAGS_ISA) $(arch-y) $(tune-y) $(call cc-option,-mshort-load-bytes,$(call cc-option,-malignment-traps,)) -msoft-float -Uarm
KBUILD_AFLAGS +=$(CFLAGS_ABI) $(AFLAGS_ISA) -Wa,$(arch-y) $(tune-y) -include asm/unified.h -msoft-float
+KBUILD_RUSTFLAGS += --target=arm-unknown-linux-gnueabi
CHECKFLAGS += -D__arm__
diff --git a/arch/arm/include/asm/vmlinux.lds.h b/arch/arm/include/asm/vmlinux.lds.h
index d60f6e83a9f7..0341973e30e1 100644
--- a/arch/arm/include/asm/vmlinux.lds.h
+++ b/arch/arm/include/asm/vmlinux.lds.h
@@ -19,7 +19,7 @@
#endif
#ifdef CONFIG_MMU
-#define ARM_MMU_KEEP(x) x
+#define ARM_MMU_KEEP(x) KEEP(x)
#define ARM_MMU_DISCARD(x)
#else
#define ARM_MMU_KEEP(x)
@@ -34,6 +34,12 @@
#define NOCROSSREFS
#endif
+#ifdef CONFIG_LD_CAN_USE_KEEP_IN_OVERLAY
+#define OVERLAY_KEEP(x) KEEP(x)
+#else
+#define OVERLAY_KEEP(x) x
+#endif
+
/* Set start/end symbol names to the LMA for the section */
#define ARM_LMA(sym, section) \
sym##_start = LOADADDR(section); \
@@ -125,13 +131,13 @@
__vectors_lma = .; \
OVERLAY 0xffff0000 : NOCROSSREFS AT(__vectors_lma) { \
.vectors { \
- *(.vectors) \
+ OVERLAY_KEEP(*(.vectors)) \
} \
.vectors.bhb.loop8 { \
- *(.vectors.bhb.loop8) \
+ OVERLAY_KEEP(*(.vectors.bhb.loop8)) \
} \
.vectors.bhb.bpiall { \
- *(.vectors.bhb.bpiall) \
+ OVERLAY_KEEP(*(.vectors.bhb.bpiall)) \
} \
} \
ARM_LMA(__vectors, .vectors); \
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 3431c0553f45..50999886a8b5 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -551,7 +551,8 @@ void show_ipi_list(struct seq_file *p, int prec)
if (!ipi_desc[i])
continue;
- seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
+ seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
+ prec >= 4 ? " " : "");
for_each_online_cpu(cpu)
seq_printf(p, "%10u ", irq_desc_kstat_cpu(ipi_desc[i], cpu));
diff --git a/arch/arm/kernel/vmlinux-xip.lds.S b/arch/arm/kernel/vmlinux-xip.lds.S
index 5eddb75a7174..f2e8d4fac068 100644
--- a/arch/arm/kernel/vmlinux-xip.lds.S
+++ b/arch/arm/kernel/vmlinux-xip.lds.S
@@ -63,7 +63,7 @@ SECTIONS
. = ALIGN(4);
__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
__start___ex_table = .;
- ARM_MMU_KEEP(KEEP(*(__ex_table)))
+ ARM_MMU_KEEP(*(__ex_table))
__stop___ex_table = .;
}
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index de373c6c2ae8..d592a203f9c6 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -74,7 +74,7 @@ SECTIONS
. = ALIGN(4);
__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
__start___ex_table = .;
- ARM_MMU_KEEP(KEEP(*(__ex_table)))
+ ARM_MMU_KEEP(*(__ex_table))
__stop___ex_table = .;
}
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 2f83fb97c6fb..e0bede6350e1 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -153,7 +153,7 @@ struct clk_lookup_alloc {
char con_id[MAX_CON_ID];
};
-static struct clk_lookup * __ref
+static __printf(3, 0) struct clk_lookup * __ref
vclkdev_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt,
va_list ap)
{
@@ -215,7 +215,7 @@ fail:
return &cla->cl;
}
-static struct clk_lookup *
+static __printf(3, 0) struct clk_lookup *
vclkdev_create(struct clk_hw *hw, const char *con_id, const char *dev_fmt,
va_list ap)
{
@@ -303,9 +303,8 @@ void clkdev_drop(struct clk_lookup *cl)
}
EXPORT_SYMBOL(clkdev_drop);
-static struct clk_lookup *__clk_register_clkdev(struct clk_hw *hw,
- const char *con_id,
- const char *dev_id, ...)
+static __printf(3, 4) struct clk_lookup *
+__clk_register_clkdev(struct clk_hw *hw, const char *con_id, const char *dev_id, ...)
{
struct clk_lookup *cl;
va_list ap;
diff --git a/init/Kconfig b/init/Kconfig
index 18717967fc8c..ede5a43029a9 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -132,6 +132,11 @@ config CC_HAS_COUNTED_BY
config CC_HAS_MULTIDIMENSIONAL_NONSTRING
def_bool $(success,echo 'char tag[][4] __attribute__((__nonstring__)) = { };' | $(CC) $(CLANG_FLAGS) -x c - -c -o /dev/null -Werror)
+config LD_CAN_USE_KEEP_IN_OVERLAY
+ # ld.lld prior to 21.0.0 did not support KEEP within an overlay description
+ # https://github.com/llvm/llvm-project/pull/130661
+ def_bool LD_IS_BFD || LLD_VERSION >= 210000
+
config RUSTC_HAS_COERCE_POINTEE
def_bool RUSTC_VERSION >= 108400
diff --git a/rust/Makefile b/rust/Makefile
index 2a8342e9c5b5..99bc3eea44a6 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -275,6 +275,7 @@ 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_arm := arm-linux-gnueabi
BINDGEN_TARGET_loongarch := loongarch64-linux-gnusf
BINDGEN_TARGET_um := $(BINDGEN_TARGET_$(SUBARCH))
BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH))
@@ -433,6 +434,13 @@ redirect-intrinsics = \
__muloti4 __multi3 \
__udivmodti4 __udivti3 __umodti3
+ifdef CONFIG_ARM
+ # Add eabi initrinsics for ARM 32-bit
+ redirect-intrinsics += \
+ __aeabi_fadd __aeabi_fmul __aeabi_fcmpeq __aeabi_fcmple __aeabi_fcmplt __aeabi_fcmpun \
+ __aeabi_dadd __aeabi_dmul __aeabi_dcmple __aeabi_dcmplt __aeabi_dcmpun \
+ __aeabi_uldivmod
+endif
ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),)
# These intrinsics are defined for ARM64 and RISCV64
redirect-intrinsics += \
diff --git a/rust/compiler_builtins.rs b/rust/compiler_builtins.rs
index f14b8d7caf89..dd16c1dc899c 100644
--- a/rust/compiler_builtins.rs
+++ b/rust/compiler_builtins.rs
@@ -73,5 +73,29 @@ define_panicking_intrinsics!("`u128` should not be used", {
__umodti3,
});
+#[cfg(target_arch = "arm")]
+define_panicking_intrinsics!("`f32` should not be used", {
+ __aeabi_fadd,
+ __aeabi_fmul,
+ __aeabi_fcmpeq,
+ __aeabi_fcmple,
+ __aeabi_fcmplt,
+ __aeabi_fcmpun,
+});
+
+#[cfg(target_arch = "arm")]
+define_panicking_intrinsics!("`f64` should not be used", {
+ __aeabi_dadd,
+ __aeabi_dmul,
+ __aeabi_dcmple,
+ __aeabi_dcmplt,
+ __aeabi_dcmpun,
+});
+
+#[cfg(target_arch = "arm")]
+define_panicking_intrinsics!("`u64` division/modulo should not be used", {
+ __aeabi_uldivmod,
+});
+
// NOTE: if you are adding a new intrinsic here, you should also add it to
// `redirect-intrinsics` in `rust/Makefile`.
diff --git a/scripts/generate_rust_target.rs b/scripts/generate_rust_target.rs
index 4fd6b6ab3e32..8667d0ae3c82 100644
--- a/scripts/generate_rust_target.rs
+++ b/scripts/generate_rust_target.rs
@@ -184,7 +184,9 @@ fn main() {
let mut ts = TargetSpec::new();
// `llvm-target`s are taken from `scripts/Makefile.clang`.
- if cfg.has("ARM64") {
+ if cfg.has("ARM") {
+ panic!("arm uses the builtin rustc target");
+ } else if cfg.has("ARM64") {
panic!("arm64 uses the builtin rustc aarch64-unknown-none target");
} else if cfg.has("RISCV") {
if cfg.has("64BIT") {
generated by cgit (git 2.34.1) at 2025-05-10 05:48:01 +0000