aarch64: fix the potential memory overlapping bug of bootloader

bootloader/build.rs

@@ -25,7 +25,7 @@ fn gen_payload_asm() -> Result<std::path::PathBuf> {
 
     write!(f, "# generated by build.rs - do not edit")?;
     write!(f, r#"
-    .section .rodata
+    .section .payload,"a"
     .align 12
     .global _kernel_payload_start, _kernel_payload_end
 _kernel_payload_start:

bootloader/src/arch/aarch64/boot.ld

@@ -27,5 +27,9 @@ SECTIONS {
     _ebss = .;
   }
 
+  .payload : {
+    *(.payload)
+  }
+
   /DISCARD/ : { *(.comment) *(.gnu*) *(.note*) *(.eh_frame*) }
 }

kernel/src/arch/aarch64/boot/entry.S

@@ -5,3 +5,4 @@ _start:
     ldr     x0, =bootstacktop
     mov     sp, x0
     bl      rust_main
+1:  b       1b

kernel/src/arch/aarch64/boot/linker.ld

@@ -2,7 +2,6 @@ ENTRY(_start)
 
 SECTIONS {
   . = 0xffff000000100000; /* Load the kernel at this address. It's also kernel stack top address */
-  bootstacktop = .;
 
   .text : {
     stext = .;
@@ -35,12 +34,15 @@ SECTIONS {
     ebss = .;
   }
 
+  .stack : {
+    . = ALIGN(4K);
+    bootstack = .;
+    . += 0x100000;
+    bootstacktop = .;
+  }
+
   /* end of the binary */
   _end = ALIGN(8);
 
-  /* number of bytes in BSS section and complete binary */
-  __bss_length = (ebss - sbss);
-  __binary_length = (_end - _start);
-
   /DISCARD/ : { *(.comment) *(.gnu*) *(.note*) *(.eh_frame*) }
 }

kernel/src/arch/aarch64/memory.rs

@@ -47,11 +47,11 @@ static mut KERNEL_MEMORY_SET: Option<MemorySet> = None;
 fn remap_the_kernel() {
     let offset = -(KERNEL_OFFSET as isize);
     let mut ms = MemorySet::new_bare();
-    ms.push(KERNEL_OFFSET, bootstacktop as usize, Linear::new(offset, MemoryAttr::default()), "kstack");
     ms.push(stext as usize, etext as usize, Linear::new(offset, MemoryAttr::default().execute().readonly()), "text");
     ms.push(sdata as usize, edata as usize, Linear::new(offset, MemoryAttr::default()), "data");
     ms.push(srodata as usize, erodata as usize, Linear::new(offset, MemoryAttr::default().readonly()), "rodata");
     ms.push(sbss as usize, ebss as usize, Linear::new(offset, MemoryAttr::default()), "bss");
+    ms.push(bootstack as usize, bootstacktop as usize, Linear::new(offset, MemoryAttr::default()), "kstack");
 
     use super::board::{IO_REMAP_BASE, IO_REMAP_END};
     ms.push(IO_REMAP_BASE, IO_REMAP_END, Linear::new(offset, MemoryAttr::default().mmio(MMIOType::Device as u8)), "io_remap");
@@ -73,7 +73,6 @@ pub fn ioremap(paddr: usize, len: usize, name: &'static str) -> usize {
 }
 
 extern "C" {
-    fn bootstacktop();
     fn stext();
     fn etext();
     fn sdata();
@@ -82,6 +81,8 @@ extern "C" {
     fn erodata();
     fn sbss();
     fn ebss();
+    fn bootstack();
+    fn bootstacktop();
     fn _start();
     fn _end();
 }