wip on fork

minimal example works

kernel/syscall/skeleton.cc

@@ -9,6 +9,7 @@
 #include "../thread/scheduler.h"
 #include "../memory/pageframealloc.h"
 #include "../memory/pagetable.h"
+#include "../arch/idt.h"
 void *operator new(size_t, void *);
 
 //#include "../user/app1/appl.h"
@@ -175,8 +176,6 @@ namespace Syscall {
 
 
 bool copy_from_phys(Vault& vault, uintptr_t phys_ptr, void* virt_ptr, size_t size) {
-	Thread* current_thread = vault.scheduler.active();
-	
 	size_t offset = Page::offset(phys_ptr); 
 	size_t total_size = size + offset;
     four_lvl_paging_t* search_table = vault.scheduler.active()->paging_tree;
@@ -185,10 +184,10 @@ bool copy_from_phys(Vault& vault, uintptr_t phys_ptr, void* virt_ptr, size_t siz
 	if (virt_addr == nullptr) {
 		return false;
 	}
-	
-  for(uint8_t i =0; i<size/4096  +1; i++){
-    setMapping((uintptr_t)virt_addr, (void*)phys_ptr, vault.scheduler.active()->paging_tree);
-  }
+
+    for(uint8_t i =0; i<size/4096  +1; i++){
+        setMapping((uintptr_t)virt_addr, (void*)phys_ptr, vault.scheduler.active()->paging_tree);
+    }
 
 	memcpy(virt_ptr, (void*)((uintptr_t)(virt_addr)+ (uintptr_t)offset), size);
     setMapping((uintptr_t)(virt_addr), 0, search_table);
@@ -280,9 +279,25 @@ bool reply(Vault& v, const void* buffer, size_t size) {
   return true;
 }
 
+void copy_stack(Thread* parent, Thread* child){
+    uintptr_t dest_frame = isMapped((uintptr_t)child->StackPointer.user, child->paging_tree);
+    void* dest_vaddr = getFreeVirtSpace(parent->paging_tree, 1);
+    setMapping((uintptr_t)dest_vaddr, (void*)dest_frame, parent->paging_tree);
+
+    memcpy(dest_vaddr, (void*)0x6000000/*((uintptr_t)parent->StackPointer.user & ~0xFFF)*/, 4096);
+
+    setMapping((uintptr_t)dest_vaddr, 0, parent->paging_tree);
+}
+
 int fork(Vault &vault, InterruptContext *user_context) {
     Thread* parent = vault.scheduler.active();
-    //Thread* child = new Thread(false, 
+    Thread* child = new Thread(false, (void*)user_context->ip, parent->code_paddr, parent->code_pagenum);
+    copy_pagetable(parent->paging_tree, child->paging_tree);
+    copy_stack(parent, child);
+
+    child->StackPointer.user = (void*)user_context->sp;
+
+    vault.scheduler.ready(child);
     
     return 0;
 }

kernel/syscall/stub.asm

@@ -6,7 +6,21 @@
 align 8
 sys_call:
 	; BSB2 1 - Syscall stub
+    push rbx
+    push rbp
+    push r11
+    push r12
+    push r13
+    push r14
+    push r15
     int 0x80
+    pop r15
+    pop r14
+    pop r13
+    pop r12
+    pop r11
+    pop rbp
+    pop rbx
     ret