toolchain: bump rust toolchain version

1. allow unexpected cfgs in lib.rs, in this case
   "no_global_oom_handling" is cause warnings [1]

2. for large code models the compiler (rust linkers) now put code and
   data in `.ltext`, `.ldata`, `.lbss`, `.lrodata` instead of the
   same `.text` , `.data` ... etc. We are adjusting accordingly in the
   linker script.

3. unsafe assertions identified undefined behaviours, in this case a repr(C)
   struct was not mared as repr(packed), therefore having an unexpected
   size. The unsafe assertions was not enabled by default in debug
   builds so the idt setup code with from_raw_parts_mut() has been
   working on UB. Glad we can catch this....

related: [1] rust-lang/rust#123501
related: [2] https://blog.rust-lang.org/2024/05/02/Rust-1.78.0.html#asserting-unsafe-preconditions

defs/x86_64-hm-linker.ld

@@ -82,20 +82,29 @@ SECTIONS
 		*(".text")
 		*(".text.*")
 		*(".text$")
+		*(".ltext")
+		*(".ltext.*")
+		*(".ltext$")
 	}
 
 	.data : AT(ADDR(.data) - KERNEL_OFFSET)
 	{
 		*(".data")
 		*(".data.*")
 		*(".data$")
+		*(".ldata")
+		*(".ldata.*")
+		*(".ldata$")
 	}
 
 	.bss : AT(ADDR(.bss) - KERNEL_OFFSET)
 	{
 		PROVIDE (___BSS_START__ = .);
 		*(".bss")
+		*(".lbss")
 		*(".bss.*")
+		*(".lbss.*")
+		*(".lbss$")
 		PROVIDE (___BSS_END__ = .);
 	}
 
@@ -104,6 +113,9 @@ SECTIONS
 		*(".rodata")
 		*(".rodata$")
 		*(".rodata.*")
+		*(".lrodata")
+		*(".lrodata$")
+		*(".lrodata.*")
 	}
 
 	PROVIDE (___KERNEL_PM_END__ = . - KERNEL_OFFSET);

src/arch/x86_64/interrupt/mod.rs

@@ -27,6 +27,7 @@ extern "C" {
 // [48:63] - addr[16:31]
 // [64:95] - addr[32:63]
 #[repr(C)]
+#[repr(packed)]
 pub struct GateDescriptor64 {
 	pub offset_1: u16,
 	pub selector: u16,

src/lib.rs

@@ -1,5 +1,6 @@
 #![allow(dead_code)]
 #![allow(unused_imports)]
+#![allow(unexpected_cfgs)]
 #![no_std]
 #![no_main]
 #![feature(const_option)]