On Wed, Feb 04, 2026 at 04:05:04AM +0100, Link Mauve wrote: > For now only Big Endian 32-bit PowerPC is supported, as that is the only > hardware I have. This has been tested on the Nintendo Wii so far, but I > plan on also using it on the GameCube, Wii U and Apple G4. > > These changes aren’t the only ones required to get the kernel to compile > and link on PowerPC, libcore will also have to be changed to not use > integer division to format u64, u128 and core::time::Duration, otherwise > __udivdi3() and __umoddi3() will have to be added. I have tested this > change by replacing the three implementations with unimplemented!() and > it linked just fine. > Hey Link, I sent a patch with ppc64le support. https://lore.kernel.org/all/[email protected]/
Can i take this patch and put ppc64le support over it and send it out? Regards, Mukesh > Signed-off-by: Link Mauve <[email protected]> > --- > Documentation/rust/arch-support.rst | 1 + > arch/powerpc/Kconfig | 1 + > arch/powerpc/Makefile | 2 ++ > arch/powerpc/include/asm/jump_label.h | 16 ++++++++++------ > rust/Makefile | 4 +++- > scripts/generate_rust_target.rs | 10 ++++++++++ > 6 files changed, 27 insertions(+), 7 deletions(-) > > diff --git a/Documentation/rust/arch-support.rst > b/Documentation/rust/arch-support.rst > index 6e6a515d0899..70b9e192a7a0 100644 > --- a/Documentation/rust/arch-support.rst > +++ b/Documentation/rust/arch-support.rst > @@ -18,6 +18,7 @@ Architecture Level of support Constraints > ``arm`` Maintained ARMv7 Little Endian only. > ``arm64`` Maintained Little Endian only. > ``loongarch`` Maintained \- > +``powerpc`` Maintained 32-bit Big Endian only. > ``riscv`` Maintained ``riscv64`` and LLVM/Clang only. > ``um`` Maintained \- > ``x86`` Maintained ``x86_64`` only. > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index 9537a61ebae0..17db23b82e91 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -283,6 +283,7 @@ config PPC > select HAVE_REGS_AND_STACK_ACCESS_API > select HAVE_RELIABLE_STACKTRACE > select HAVE_RSEQ > + select HAVE_RUST if PPC32 > select HAVE_SAMPLE_FTRACE_DIRECT if > HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS > select HAVE_SAMPLE_FTRACE_DIRECT_MULTI if > HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS > select HAVE_SETUP_PER_CPU_AREA if PPC64 > diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile > index a58b1029592c..9fd82c75dcbd 100644 > --- a/arch/powerpc/Makefile > +++ b/arch/powerpc/Makefile > @@ -61,6 +61,8 @@ else > KBUILD_LDFLAGS_MODULE += $(objtree)/arch/powerpc/lib/crtsavres.o > endif > > +KBUILD_RUSTFLAGS += --target=powerpc-unknown-linux-gnu > + > ifdef CONFIG_CPU_LITTLE_ENDIAN > KBUILD_CPPFLAGS += -mlittle-endian > KBUILD_LDFLAGS += -EL > diff --git a/arch/powerpc/include/asm/jump_label.h > b/arch/powerpc/include/asm/jump_label.h > index d4eaba459a0e..238f0f625a36 100644 > --- a/arch/powerpc/include/asm/jump_label.h > +++ b/arch/powerpc/include/asm/jump_label.h > @@ -15,14 +15,18 @@ > #define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) > #define JUMP_LABEL_NOP_SIZE 4 > > +/* This macro is also expanded on the Rust side. */ > +#define ARCH_STATIC_BRANCH_ASM(key, label) \ > + "1:\n\t" \ > + "nop # arch_static_branch\n\t" \ > + ".pushsection __jump_table, \"aw\"\n\t" \ > + ".long 1b - ., " label " - .\n\t" \ > + JUMP_ENTRY_TYPE key " - .\n\t" \ > + ".popsection \n\t" > + > static __always_inline bool arch_static_branch(struct static_key *key, bool > branch) > { > - asm goto("1:\n\t" > - "nop # arch_static_branch\n\t" > - ".pushsection __jump_table, \"aw\"\n\t" > - ".long 1b - ., %l[l_yes] - .\n\t" > - JUMP_ENTRY_TYPE "%c0 - .\n\t" > - ".popsection \n\t" > + asm goto(ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]") > : : "i" (&((char *)key)[branch]) : : l_yes); > > return false; > diff --git a/rust/Makefile b/rust/Makefile > index 5c0155b83454..377e6fd68524 100644 > --- a/rust/Makefile > +++ b/rust/Makefile > @@ -400,13 +400,15 @@ bindgen_skip_c_flags := -mno-fp-ret-in-387 > -mpreferred-stack-boundary=% \ > -fno-inline-functions-called-once -fsanitize=bounds-strict \ > -fstrict-flex-arrays=% -fmin-function-alignment=% \ > -fzero-init-padding-bits=% -mno-fdpic \ > - --param=% --param asan-% -fno-isolate-erroneous-paths-dereference > + --param=% --param asan-% -fno-isolate-erroneous-paths-dereference \ > + -ffixed-r2 -mmultiple -mno-readonly-in-sdata > > # 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_powerpc := powerpc-linux-gnu > BINDGEN_TARGET_um := $(BINDGEN_TARGET_$(SUBARCH)) > BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH)) > > diff --git a/scripts/generate_rust_target.rs b/scripts/generate_rust_target.rs > index 38b3416bb979..0054880ba0ea 100644 > --- a/scripts/generate_rust_target.rs > +++ b/scripts/generate_rust_target.rs > @@ -188,6 +188,16 @@ fn main() { > 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("PPC32") { > + ts.push("arch", "powerpc"); > + ts.push("data-layout", "E-m:e-p:32:32-Fn32-i64:64-n32"); > + ts.push("features", "+soft-float"); > + ts.push("llvm-target", "powerpc-unknown-eabi"); > + if cfg.rustc_version_atleast(1, 91, 0) { > + ts.push("target-pointer-width", 32); > + } else { > + ts.push("target-pointer-width", "32"); > + } > } else if cfg.has("RISCV") { > if cfg.has("64BIT") { > panic!("64-bit RISC-V uses the builtin rustc > riscv64-unknown-none-elf target"); > -- > 2.52.0 >
