debug serial output and fixed syscalls

src/PCB.c

@@ -5,7 +5,7 @@
 #define NUM_PROCS 16
 
 process* procs[NUM_PROCS]; 
-int curproc=-1;
+int curproc=0;
 int firstfree=0;
 
 //process* curproc;
@@ -18,6 +18,11 @@ void addproc(process* proc)
     //curproc=proc; 
 }
 
+void settf(trapframe* tf)
+{
+    procs[curproc]->tf = tf;
+}
+
 void schedule()
 {
     int old = curproc;
@@ -46,13 +51,13 @@ int yield()
 
 int print1()
 {
-    terminal_writestring("1");
+    terminal_writestring("1\n");
     return 1;
 }
 
 int print2()
 {
-    terminal_writestring("2");
+    terminal_writestring("2\n");
     return 2;
 }
 
@@ -63,13 +68,18 @@ void syscall()
 {
     int num = procs[curproc]->tf->eax;
     
+    serial_hexword(num);
+    serial_writestring(" SYSCALLED\n");
+    
     if(num>0 && num<NUM_SYSCALLS && syscalls[num])
     {
         procs[curproc]->tf->eax = syscalls[num]();
     }
     else
     {
-        serial_writestring("UNKNOWN SYSCALL CALLED\n");
+        serial_writestring("UNKNOWN SYSCALL CALLED ");
+        serial_hexword(num);
+        serial_writestring("\n");
         procs[curproc]->tf->eax = -1;
     }
 }

src/PCB.h

@@ -66,6 +66,7 @@ typedef struct
 extern void context_switch(context** old, context* new);
 void syscall();
 void addproc(process* proc);
+void settf(trapframe* tf);
 void proc_setup();
 
 #endif

src/exceptions.c

@@ -59,7 +59,14 @@ void int_general_protection_fault(uint32_t __attribute__((unused))error)
 }
 void int_page_fault(uint32_t __attribute__((unused))error)
 {
-    serial_writestring("PAGE FAULT ERROR\n");
+    serial_writestring("PAGE FAULT ERROR ");
+    serial_hexword(error);
+    uint32_t cr2;
+    asm volatile("movl %%cr2, %0" : "=r" (cr2) : );
+    //register uint32_t cr2 asm("%%cr2");
+    serial_writestring(" ");
+    serial_hexword(cr2);
+    serial_writestring("\n");
 }
 void int_reserved(uint32_t __attribute__((unused))error)
 {

src/idt.c

@@ -2,6 +2,7 @@
 #include "string.h"
 #include "serial.h"
 #include "exceptions.h"
+#include "PCB.h"
 
 #pragma GCC push_options
 #pragma GCC optimize ("0")
@@ -45,6 +46,7 @@ void load_error_handlers()
 
 void default_handler(trapframe reg) 
 {
+    settf(&reg);
     if(reg.trap<32)
 	reg.eip+=2;
     if(handlers[reg.trap]!=NULL)
@@ -105,7 +107,7 @@ int idt_init(uint16_t code_sel)
     idtsetup();
     idt_install();
     load_error_handlers();
-    handlers[0x100] = syscall;
+    handlers[0x80] = syscall;
     return 0;
 }
 #pragma GCC pop_options

src/test.c

@@ -6,8 +6,8 @@
 
 void test_idt()
 {
-    asm ("int $0x80");
-    asm ("int $0x90");
+    asm volatile("mov $4, %eax; int $0x80");
+    asm volatile("int $0x90");
 }
 
 void test_mem()