feat: fonction task_switch & task_run passe en mode utilisateur RING0 mais plantage lors de l'execution

include/interrupts.h

@@ -56,11 +56,11 @@
 })
 
 #define createdump(dump) ({ \
+        push(dump.ss);\
+        push(dump.esp);\
         push(dump.eflags);\
         push(dump.cs);\
         push(dump.eip);\
-        push(dump.esp);\
-        push(dump.ss);\
         push(dump.ds);\
         push(dump.es);\
         push(dump.fs);\
@@ -90,11 +90,11 @@
 
 #define dumpcpu()  ({ \
 	asm("\
+        pushl %%ss\n \
+        pushl %%esp\n \
         pushf \n \
         pushl %%cs\n \
         pushl $0x0\n \
-        pushl %%esp\n \
-        pushl %%ss\n \
     	pushl %%ds\n \
         pushl %%es\n \
         pushl %%fs\n \
@@ -132,7 +132,7 @@
         pushl %%eax":::);\
 })
 
-#define restcpu(usermode)  ({\
+#define restcpu()  ({\
 	asm("\
         popl %%eax \n \
         popl %%edx \n \
@@ -166,11 +166,9 @@
         popl %%fs\n \
         popl %%es\n \
   	popl %%ds\n \"::);\
-	if (usermode==true)\
-		asm("add $0x8,%%esp"::);\
 })
 
-#define restdebugcpu(usermode) ({\
+#define restdebugcpu() ({\
 	asm("\
         popl %%eax \n \
         popl %%edx \n \
@@ -198,8 +196,6 @@
         popl %%fs\n \
         popl %%es\n \
   	popl %%ds":::);\
-	if (usermode==true)\
-		asm("add $0x8,%%esp"::);\
 })
 
 /*
@@ -237,11 +233,11 @@ typedef struct regs {
    u32 fs;
    u32 es;
    u32 ds;
-   u32 ss;
-   u32 esp;
    u32 eip;
    u32 cs;
    u32 eflags;
+   u32 esp;
+   u32 ss;
 } regs __attribute__ ((packed));
 /* exception pile */
 typedef struct exception_stack {

lib/interrupts.c

@@ -214,14 +214,7 @@ void exception1()
           initselectors(retry_address);            
     }
     changevc(0);
-    if (dump->cs==SEL_KERNEL_CODE)
+    restdebugcpu();
-    {
-    	restdebugcpu(true);
-    }
-    else
-    {
-    	restdebugcpu(false);
-    }
     iret();
 }
 
@@ -435,14 +428,7 @@ void exception14()
         printf("Page fault - %s at adress %Y cs:eip - %Y:%Y\r\n",ex14_errors[current->error_code & 0xF],dump->cr2,dump->cs,dump->eip);
         cpuerror("#SS Page fault",dump);
 	}
-    if (dump->cs==SEL_KERNEL_CODE)
+    restdebugcpu();
-    {
-    	restdebugcpu(true);
-    }
-    else
-    {
-    	restdebugcpu(false);
-    }
     iret();
 }
 

lib/process.c

@@ -154,18 +154,12 @@ u32 task_usePID (u32 pid)
 
 void task_switch(u32 pid, bool fromkernelmode)
 {
+    process *previous=current;
 	current = &processes[pid];
     	setTSS(current->kstack.ss0,current->kstack.esp0);
 	current->dump.eflags = (current->dump.eflags | 0x200) & 0xFFFFBFFF;
     createdump(current->dump);
-	if (fromkernelmode) 
+    restdebugcpu();
-	{
-            restdebugcpu(true);
-	} 
-	else 
-	{
-    	   restdebugcpu(false);
-	}
     iret();
 }
 
@@ -175,7 +169,7 @@ void task_switch(u32 pid, bool fromkernelmode)
 void task_run(u32 pid)
 {  
 	processes[pid].status = STATUS_RUN;
-    task_switch(pid, true);
+    task_switch(pid, false);
 }
 
 /*******************************************************************************/
@@ -194,7 +188,7 @@ u32 task_create(u8 *code)
 	setcr3(processes[pid].pdd->addr->paddr);
 	kstack = virtual_page_getfree();
 	processes[pid].dump.ss = SEL_USER_STACK | RPL_RING3;
-	processes[pid].dump.esp = USER_STACK;
+	processes[pid].dump.esp = USER_STACK-16;
 	processes[pid].dump.eflags = 0x0;
 	processes[pid].dump.cs = SEL_USER_CODE  | RPL_RING3;
 	processes[pid].dump.eip = elf_load(code,pid);

lib/syscall.c

@@ -42,7 +42,7 @@ void sysenter_handler(void)
 			break;
 		
 	}
-    restdebugcpu(true);
+    restdebugcpu();
     sysexit();
 }