解决内存allocate函数有可能访问未知内存的问题

Cargo.toml

@@ -6,14 +6,5 @@ edition = "2021"
 # 此Cargo.toml仅用于rust-analyzer识别rust部分的代码
 # 不应使用cargo编译
 
-[build]
-type = "staticlib"
-rustflags = [
-    "-C", "embed-bitcode=no",
-    "-C", "code-model=large",
-    "-C", "relocation-model=static",
-    "-L", "crate=${PWD}/../rustlib/${ARCH}/src/"
-]
-
 [target.'cfg(target_arch = "x86_64")']
 target = "x86_64-unknown-none"

include/kernel/memm.h

@@ -139,9 +139,9 @@ allocator对象在进程与内核之间传递时一律使用内核空间的映
  */
 void *memm_allocate(usize size, usize pid);
 #define memm_addr_set_allocator(mem, allocator) \
-    *(allocator_t **)(mem - 16) = allocator;
+    *(allocator_t **)((void *)(mem) - 16) = allocator;
 #define memm_addr_get_allocator(mem) \
-    ((*(allocator_t **)(mem - 16)))
+    ((*(allocator_t **)((void *)(mem) - 16)))
 
 void *memm_kernel_allocate(usize size);
 

src/kernel/memm/memm.c

@@ -200,6 +200,7 @@ void *memm_allocate(usize size, usize pid)
     ptr = new_allocator->allocate(&new_allocator->allocator_instance, orgsize, 0);
 
 after_allocation:
+    if (ptr != nullptr)
         memm_addr_set_allocator(ptr, allocator);
     return ptr;
 }

src/kernel/memm/memm.rs

@@ -1,6 +1,9 @@
 extern crate core;
 
-use core::alloc::{GlobalAlloc, Layout};
+use core::{
+    alloc::{GlobalAlloc, Layout},
+    ptr::null_mut,
+};
 
 extern "C" {
     pub fn memm_kernel_allocate(size: usize) -> *mut u8;
@@ -12,7 +15,14 @@ pub struct KernelAllocator {}
 
 unsafe impl GlobalAlloc for KernelAllocator {
     unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
-        memm_kernel_allocate(layout.size())
+        let res = memm_kernel_allocate(layout.size());
+        if res == null_mut() {
+            panic!(
+                "Kernel allocator failed to allocate {} byte(s) memory.",
+                layout.size()
+            );
+        }
+        res
     }
 
     unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {

src/metaverse.lds

@@ -96,6 +96,10 @@ SECTIONS {
     {
         *(.debug_pubtypes)
     }
+    .debug_frame :
+    {
+        *(.debug_frame)
+    }
     .kend :
     {
         *(.kend)