[platforms] only keep _start in .text section

Specifically, it moves `_start_primary` and `_start_secondary` from the
`.text.boot` section to the `.text` section to prevent the linker from
placing them before `_start`.

Fix #25

Author: equation314

platforms/axplat-aarch64-bsta1000b/src/boot.rs

@@ -79,7 +79,7 @@ unsafe extern "C" fn _start() -> ! {
 
 /// The earliest entry point for the primary CPU.
 #[unsafe(naked)]
-#[unsafe(link_section = ".text.boot")]
+#[unsafe(link_section = ".text")]
 unsafe extern "C" fn _start_primary() -> ! {
     // X0 = dtb
     core::arch::naked_asm!("
@@ -120,7 +120,7 @@ unsafe extern "C" fn _start_primary() -> ! {
 /// The earliest entry point for the secondary CPUs.
 #[cfg(feature = "smp")]
 #[unsafe(naked)]
-#[unsafe(link_section = ".text.boot")]
+#[unsafe(link_section = ".text")]
 pub(crate) unsafe extern "C" fn _start_secondary() -> ! {
     // X0 = stack pointer
     core::arch::naked_asm!("

platforms/axplat-aarch64-phytium-pi/src/boot.rs

@@ -80,7 +80,7 @@ unsafe extern "C" fn _start() -> ! {
 
 /// The earliest entry point for the primary CPU.
 #[unsafe(naked)]
-#[unsafe(link_section = ".text.boot")]
+#[unsafe(link_section = ".text")]
 unsafe extern "C" fn _start_primary() -> ! {
     // X0 = dtb
     core::arch::naked_asm!("
@@ -123,7 +123,7 @@ unsafe extern "C" fn _start_primary() -> ! {
 /// The earliest entry point for the secondary CPUs.
 #[cfg(feature = "smp")]
 #[unsafe(naked)]
-#[unsafe(link_section = ".text.boot")]
+#[unsafe(link_section = ".text")]
 pub(crate) unsafe extern "C" fn _start_secondary() -> ! {
     // X0 = stack pointer
     core::arch::naked_asm!("

platforms/axplat-aarch64-qemu-virt/src/boot.rs

@@ -73,7 +73,7 @@ unsafe extern "C" fn _start() -> ! {
 
 /// The earliest entry point for the primary CPU.
 #[unsafe(naked)]
-#[unsafe(link_section = ".text.boot")]
+#[unsafe(link_section = ".text")]
 unsafe extern "C" fn _start_primary() -> ! {
     // X0 = dtb
     core::arch::naked_asm!("
@@ -114,7 +114,7 @@ unsafe extern "C" fn _start_primary() -> ! {
 /// The earliest entry point for the secondary CPUs.
 #[cfg(feature = "smp")]
 #[unsafe(naked)]
-#[unsafe(link_section = ".text.boot")]
+#[unsafe(link_section = ".text")]
 pub(crate) unsafe extern "C" fn _start_secondary() -> ! {
     // X0 = stack pointer
     core::arch::naked_asm!("

platforms/axplat-aarch64-raspi/src/boot.rs

@@ -95,7 +95,7 @@ unsafe extern "C" fn _start() -> ! {
 /// The earliest entry point for the secondary CPUs.
 #[cfg(feature = "smp")]
 #[unsafe(naked)]
-#[unsafe(link_section = ".text.boot")]
+#[unsafe(link_section = ".text")]
 pub(crate) unsafe extern "C" fn _start_secondary() -> ! {
     // X0 = stack pointer
     core::arch::naked_asm!("

platforms/axplat-loongarch64-qemu-virt/src/boot.rs

@@ -92,7 +92,7 @@ unsafe extern "C" fn _start() -> ! {
 #[cfg(feature = "smp")]
 #[unsafe(naked)]
 #[unsafe(no_mangle)]
-#[unsafe(link_section = ".text.boot")]
+#[unsafe(link_section = ".text")]
 unsafe extern "C" fn _start_secondary() -> ! {
     core::arch::naked_asm!("
         ori          $t0, $zero, 0x1     # CSR_DMW1_PLV0

platforms/axplat-riscv64-qemu-virt/src/boot.rs

@@ -68,7 +68,7 @@ unsafe extern "C" fn _start() -> ! {
 #[cfg(feature = "smp")]
 #[unsafe(naked)]
 #[unsafe(no_mangle)]
-#[unsafe(link_section = ".text.boot")]
+#[unsafe(link_section = ".text")]
 unsafe extern "C" fn _start_secondary() -> ! {
     // a0 = hartid
     // a1 = SP