fix(rt): use #[unsafe(naked)] macro which is to be stablized in rustc

Naked functions are to be stablized in this pull request: rust-lang/rust#134213

Signed-off-by: Zhouqi Jiang <[email protected]>

Author: luojia65

bouffalo-rt/Cargo.toml

@@ -13,8 +13,6 @@ cfg-if = "1.0.0"
 embedded-time = "0.12.1"
 plic = "0.0.2"
 xuantie-riscv = { git = "https://github.com/rustsbi/xuantie", rev = "fe7ec712" }
-# FIXME: remove this dependency once `#![feature(naked_functions)]` is stablized
-naked-function = "0.1.5"
 
 [dev-dependencies]
 

bouffalo-rt/src/soc/bl616.rs

@@ -3,7 +3,7 @@
 use crate::{HalBasicConfig, HalFlashConfig, HalPatchCfg};
 
 #[cfg(all(feature = "bl616", target_arch = "riscv32"))]
-#[naked_function::naked]
+#[unsafe(naked)]
 #[link_section = ".text.entry"]
 #[export_name = "_start"]
 unsafe extern "C" fn start() -> ! {

bouffalo-rt/src/soc/bl702.rs

@@ -14,7 +14,7 @@ use core::arch::naked_asm;
 const LEN_STACK: usize = 1 * 1024;
 
 #[cfg(feature = "bl702")]
-#[naked_function::naked]
+#[unsafe(naked)]
 #[unsafe(link_section = ".text.entry")]
 #[unsafe(export_name = "_start")]
 unsafe extern "C" fn start() -> ! {