diff --git a/c-gull/src/lib.rs b/c-gull/src/lib.rs
index dd042ee..025d1ea 100644
--- a/c-gull/src/lib.rs
+++ b/c-gull/src/lib.rs
@@ -1,7 +1,5 @@
 #![doc = include_str!("../README.md")]
 #![feature(sync_unsafe_cell)]
-#![feature(strict_provenance)]
-#![deny(fuzzy_provenance_casts, lossy_provenance_casts)]
 #![cfg_attr(not(feature = "std"), no_std)]
 // Don't warn if `try_into()` is fallible on some targets.
 #![allow(unreachable_patterns)]
diff --git a/c-scape/Cargo.toml b/c-scape/Cargo.toml
index 8417e66..0d064f8 100644
--- a/c-scape/Cargo.toml
+++ b/c-scape/Cargo.toml
@@ -23,7 +23,7 @@ rustix = { version = "0.38.35", default-features = false, features = ["event", "
 rustix-futex-sync = { version = "0.2.1", features = ["atomic_usize"] }
 memoffset = "0.9.0"
 realpath-ext = { version = "0.1.0", default-features = false }
-origin = { version = "0.23.3", default-features = false, features = ["init-fini-arrays", "program-at-exit", "thread-at-exit", "nightly", "getauxval"] }
+origin = { version = "0.24.0", default-features = false, features = ["init-fini-arrays", "program-at-exit", "thread-at-exit", "nightly", "getauxval"] }
 # We use the libc crate for C ABI types and constants, but we don't depend on
 # the actual platform libc.
 libc = { version = "0.2.155", default-features = false }
diff --git a/c-scape/src/jmp.rs b/c-scape/src/jmp.rs
index c1745b5..eb226c3 100644
--- a/c-scape/src/jmp.rs
+++ b/c-scape/src/jmp.rs
@@ -45,9 +45,40 @@ unsafe extern "C" fn setjmp(env: jmp_buf) -> c_int {
         )
     }
 
-    #[cfg(target_arch = "riscv64")]
+    #[cfg(all(target_arch = "riscv64", target_feature = "soft-float"))]
+    {
+        naked_asm!(
+            // Save all the callee-saved registers, the incoming stack pointer
+            // value, and the incoming return address into the `jmp_buf`.
+            "sd s0, 0(a0)",
+            "sd s1, 8(a0)",
+            "sd s2, 16(a0)",
+            "sd s3, 24(a0)",
+            "sd s4, 32(a0)",
+            "sd s5, 40(a0)",
+            "sd s6, 48(a0)",
+            "sd s7, 56(a0)",
+            "sd s8, 64(a0)",
+            "sd s9, 72(a0)",
+            "sd s10, 80(a0)",
+            "sd s11, 88(a0)",
+            "sd sp, 96(a0)",
+            "sd ra, 104(a0)",
+            // Soft-float mode; don't save the floating-point registers.
+
+            // Return 0.
+            "li a0, 0",
+            // Return to the caller normally.
+            "ret"
+        )
+    }
+
+    #[cfg(all(target_arch = "riscv64", not(target_feature = "soft-float")))]
     {
         naked_asm!(
+            // arch option manipulation needed due to LLVM/Rust bug, see rust-lang/rust#80608
+            ".option push",
+            ".option arch, +d",
             // Save all the callee-saved registers, the incoming stack pointer
             // value, and the incoming return address into the `jmp_buf`.
             "sd s0, 0(a0)",
@@ -64,6 +95,7 @@ unsafe extern "C" fn setjmp(env: jmp_buf) -> c_int {
             "sd s11, 88(a0)",
             "sd sp, 96(a0)",
             "sd ra, 104(a0)",
+            // Hard-float mode; save the floating-point registers.
             "fsd fs0, 112(a0)",
             "fsd fs1, 120(a0)",
             "fsd fs2, 128(a0)",
@@ -79,7 +111,9 @@ unsafe extern "C" fn setjmp(env: jmp_buf) -> c_int {
             // Return 0.
             "li a0, 0",
             // Return to the caller normally.
-            "ret"
+            "ret",
+            // arch option manipulation needed due to LLVM/Rust bug, see rust-lang/rust#80608
+            ".option pop"
         )
     }
 
@@ -178,9 +212,40 @@ unsafe extern "C" fn longjmp(env: jmp_buf, val: c_int) -> ! {
         )
     }
 
-    #[cfg(target_arch = "riscv64")]
+    #[cfg(all(target_arch = "riscv64", target_feature = "soft-float"))]
+    {
+        naked_asm!(
+            // Restore the callee-saved registers and the stack pointer.
+            "ld s0, 0(a0)",
+            "ld s1, 8(a0)",
+            "ld s2, 16(a0)",
+            "ld s3, 24(a0)",
+            "ld s4, 32(a0)",
+            "ld s5, 40(a0)",
+            "ld s6, 48(a0)",
+            "ld s7, 56(a0)",
+            "ld s8, 64(a0)",
+            "ld s9, 72(a0)",
+            "ld s10, 80(a0)",
+            "ld s11, 88(a0)",
+            "ld sp, 96(a0)",
+            "ld ra, 104(a0)",
+            // Soft-float mode; don't restore the floating-point registers.
+
+            // Return `val == 0 ? 1 : val`.
+            "seqz a0, a1",
+            "add a0, a0, a1",
+            // Jump to the `setjmp`'s return address.
+            "ret"
+        );
+    }
+
+    #[cfg(all(target_arch = "riscv64", not(target_feature = "soft-float")))]
     {
         naked_asm!(
+            // arch option manipulation needed due to LLVM/Rust bug, see rust-lang/rust#80608
+            ".option push",
+            ".option arch, +d",
             // Restore the callee-saved registers and the stack pointer.
             "ld s0, 0(a0)",
             "ld s1, 8(a0)",
@@ -196,6 +261,7 @@ unsafe extern "C" fn longjmp(env: jmp_buf, val: c_int) -> ! {
             "ld s11, 88(a0)",
             "ld sp, 96(a0)",
             "ld ra, 104(a0)",
+            // Hard-float mode; restore the floating-point registers.
             "fld fs0, 112(a0)",
             "fld fs1, 120(a0)",
             "fld fs2, 128(a0)",
@@ -212,7 +278,9 @@ unsafe extern "C" fn longjmp(env: jmp_buf, val: c_int) -> ! {
             "seqz a0, a1",
             "add a0, a0, a1",
             // Jump to the `setjmp`'s return address.
-            "ret"
+            "ret",
+            // arch option manipulation needed due to LLVM/Rust bug, see rust-lang/rust#80608
+            ".option pop"
         );
     }
 
diff --git a/c-scape/src/lib.rs b/c-scape/src/lib.rs
index 0c72614..8572149 100644
--- a/c-scape/src/lib.rs
+++ b/c-scape/src/lib.rs
@@ -7,10 +7,6 @@
 #![feature(sync_unsafe_cell)] // for lots of libc static variables
 #![feature(linkage)] // for `malloc` etc.
 #![feature(naked_functions)] // for `setjmp` etc.
-// Enable strict provenance.
-#![feature(strict_provenance)]
-#![feature(exposed_provenance)]
-#![deny(fuzzy_provenance_casts, lossy_provenance_casts)]
 // Disable some common warnings.
 #![allow(unexpected_cfgs)]
 // Don't warn if `try_into()` is fallible on some targets.
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index d126dcb..1a27b4e 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2024-10-12"
+channel = "nightly-2025-01-02"
 components = ["rustc", "cargo", "rust-std", "rust-src", "rustfmt"]