Implement some basic syscall

arch/x86/cpu_context.c

@@ -489,3 +489,34 @@ void cpu_context_update_kernel_tss(struct cpu_state *next_ctxt)
      mode */
     }
 }
+
+
+inline
+int syscallGet3args(const struct cpu_state *user_ctxt,
+			       /* out */unsigned int *arg1,
+			       /* out */unsigned int *arg2,
+			       /* out */unsigned int *arg3)
+{
+  *arg1 = user_ctxt->ebx;
+  *arg2 = user_ctxt->ecx;
+  *arg3 = user_ctxt->edx;
+  return 0;
+}
+
+
+int syscallGet1arg(const struct cpu_state *user_ctxt,
+			      /* out */unsigned int *arg1)
+{
+  unsigned int unused;
+  return syscallGet3args(user_ctxt, arg1, & unused, & unused);
+}
+
+
+int _syscallGet2args(const struct cpu_state *user_ctxt,
+			       /* out */unsigned int *arg1,
+			       /* out */unsigned int *arg2)
+{
+  unsigned int unused;
+  return syscallGet3args(user_ctxt, arg1, arg2, & unused);
+}
+

arch/x86/swintr.c

@@ -1,4 +1,4 @@
-#include "syscall.h"
+#include "swintr.h"
 #include "irq.h"
 #include "idt.h"
 
@@ -14,8 +14,3 @@ int syscallSetup(){
     return ret;
 }
 
-int syscall_execute(int syscallId, const struct cpu_state *user_ctx){
-    (void)syscallId;
-    (void)user_ctx;
-    return 0;
-}

arch/x86/swintr.h

@@ -2,4 +2,5 @@
 
 #define SYSCALL_INTR_NB  0x42
 
+
 int syscallSetup();

arch/x86/syscall_wrappers.S

@@ -6,7 +6,7 @@
 .text
 
 /* The address of the real "C" syscall function */
-.extern syscall_execute
+.extern syscallExecute
 
 /** Update the kernel TSS in case we are switching to a thread in user
 	mode in order to come back into the correct kernel stack */
@@ -51,7 +51,7 @@ syscallHandler:
   pushl %esp /* user_ctxt */
   pushl %eax /* syscall ID */
 
-  call  syscall_execute
+  call  syscallExecute
   /* Unallocate the stack used by the
      do_syscall arguments */
   addl  $8, %esp

core/cpu_context.h

@@ -200,3 +200,15 @@ void cpu_state_detect_kernel_stack_overflow(const struct cpu_state *ctxt,
                                                                                     */})
 #define cpu_state_detect_kernel_stack_overflow(ctxt, stkbottom, stksize) ({/* nop */})
 #endif
+
+int syscallGet3args(const struct cpu_state *user_ctxt,
+                    /* out */ unsigned int *arg1,
+                    /* out */ unsigned int *arg2,
+                    /* out */ unsigned int *arg3);
+
+int syscallGet1arg(const struct cpu_state *user_ctxt,
+                   /* out */ unsigned int *arg1);
+
+int syscallGet2args(const struct cpu_state *user_ctxt,
+                    /* out */ unsigned int *arg1,
+                    /* out */ unsigned int *arg2);

core/thread.c

@@ -28,6 +28,7 @@ void threadExit()
     currentThread->state = EXITING;
     currentThread        = next;
     currentThread->state = RUNNING;
+    threadPrepareContext(next);
     cpu_context_exit_to(next->cpuState, (cpu_kstate_function_arg1_t *)threadDelete,
                         (uint32_t)current);