fork: fs_base should be inherited

Signed-off-by: Andy-Python-Programmer <[email protected]>

Author: Andy-Python-Programmer

src/aero_kernel/src/arch/x86_64/task.asm

@@ -80,8 +80,9 @@ sysret_fork_init:
 
     o64 sysret
 
-; This function is responsible for switching from the current context to the new one and 
-; also save the current state in the previous context so there is a restore point.
+; extern "C" fn task_spinup(prev: &mut Context, next: &mut Context)
+;
+; Saves the current context into `prev` and restore the context from `next`.
 task_spinup:
     pushfq
 
@@ -112,4 +113,5 @@ task_spinup:
 
     popfq
 
+    ; Resume the next thread.
     ret

src/aero_kernel/src/arch/x86_64/task.rs

@@ -28,8 +28,8 @@ use core::ptr::Unique;
 use crate::fs::cache::DirCacheItem;
 use crate::mem::paging::*;
 use crate::syscall::{ExecArgs, RegistersFrame, SyscallFrame};
-use crate::userland::vm::{LoadedBinary, Vm};
-use crate::utils::StackHelper;
+use crate::userland::vm::Vm;
+use crate::utils::{io, StackHelper};
 
 use super::controlregs;
 use super::gdt::Ring;
@@ -278,7 +278,9 @@ impl ArchTask {
             context_switch_rsp: VirtAddr::new(switch_stack as u64),
             address_space: new_address_space,
             rpl: Ring::Ring3,
-            fs_base: VirtAddr::zero(),
+
+            // The FS base is inherited from the parent process.
+            fs_base: self.fs_base.clone(),
         })
     }