rust: remove x86 panicking intrinsics.

This removes the panicking implementation of the x86 intrinsics.

This requires a PR [0] for the rust core library to remove the need for
the `__udivti3` intrinsic. This PR disables formatting support for the
`i/u128` rust primitives when the `no_iu128_fmt` config option is set.

In order to remove the need for the other intrinsics a recent rust
version is required (Tested with 1.84).

Link: rust-lang/rust#136385 [0]
Signed-off-by: Christian Schrefl <chrisi.schrefl@gmail.com>

Author: onestacked

rust/Makefile

@@ -53,7 +53,7 @@ rustdoc_test_kernel_quiet=>/dev/null
 endif
 
 core-cfgs = \
-    --cfg no_fp_fmt_parse
+    --cfg no_fp_fmt_parse --cfg no_iu128_fmt
 
 quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
       cmd_rustdoc = \
@@ -388,19 +388,6 @@ rust-analyzer:
 		$(rustc_sysroot) $(RUST_LIB_SRC) $(if $(KBUILD_EXTMOD),$(srcroot)) \
 		> rust-project.json
 
-redirect-intrinsics = \
-	__addsf3 __eqsf2 __extendsfdf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __truncdfsf2 __unordsf2 \
-	__adddf3 __eqdf2 __ledf2 __ltdf2 __muldf3 __unorddf2 \
-	__muloti4 __multi3 \
-	__udivmodti4 __udivti3 __umodti3
-
-ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),)
-	# These intrinsics are defined for ARM64 and RISCV64
-	redirect-intrinsics += \
-		__ashrti3 \
-		__ashlti3 __lshrti3
-endif
-
 define rule_rustc_library
 	$(call cmd_and_fixdep,rustc_library)
 	$(call cmd,gen_objtooldep)

rust/compiler_builtins.rs

@@ -25,6 +25,7 @@
 #![no_builtins]
 #![no_std]
 
+#[expect(unused_macros)]
 macro_rules! define_panicking_intrinsics(
     ($reason: tt, { $($ident: ident, )* }) => {
         $(
@@ -37,41 +38,5 @@ macro_rules! define_panicking_intrinsics(
     }
 );
 
-define_panicking_intrinsics!("`f32` should not be used", {
-    __addsf3,
-    __eqsf2,
-    __extendsfdf2,
-    __gesf2,
-    __lesf2,
-    __ltsf2,
-    __mulsf3,
-    __nesf2,
-    __truncdfsf2,
-    __unordsf2,
-});
-
-define_panicking_intrinsics!("`f64` should not be used", {
-    __adddf3,
-    __eqdf2,
-    __ledf2,
-    __ltdf2,
-    __muldf3,
-    __unorddf2,
-});
-
-define_panicking_intrinsics!("`i128` should not be used", {
-    __ashrti3,
-    __muloti4,
-    __multi3,
-});
-
-define_panicking_intrinsics!("`u128` should not be used", {
-    __ashlti3,
-    __lshrti3,
-    __udivmodti4,
-    __udivti3,
-    __umodti3,
-});
-
 // NOTE: if you are adding a new intrinsic here, you should also add it to
 // `redirect-intrinsics` in `rust/Makefile`.