feat: use PIC code model for shared libraries, fix shared library bugs

kernel/src/Hal/IDT.cpp

@@ -71,6 +71,13 @@ namespace Hal {
         return frame->CS;
     }
 
+    static System::PanicFrame* GetExceptionRegs(uint8_t vector, System::PanicFrame* frame) {
+        if (ExceptionHasErrorCode(vector)) {
+            return (System::PanicFrame*)((uint8_t*)frame + sizeof(uint64_t));
+        }
+        return frame;
+    }
+
     template<size_t i>
     __attribute__((interrupt)) void ExceptionHandler(System::PanicFrame* frame)
     {
@@ -85,6 +92,7 @@ namespace Hal {
         // instead of panicking the entire system.
         if (fromUser && Sched::GetCurrentPid() >= 0) {
             auto* proc = Sched::GetCurrentProcessPtr();
+            auto* regs = GetExceptionRegs(i, frame);
             Kt::KernelLogStream(Kt::ERROR, "Exception")
                 << ExceptionStrings[i] << " in process \""
                 << proc->name << "\" (pid " << proc->pid
@@ -99,11 +107,11 @@ namespace Hal {
             rep.exceptionVector = i;
             for (int j = 0; j < 32 && ExceptionStrings[i][j]; j++) rep.exceptionName[j] = ExceptionStrings[i][j];
             rep.exceptionName[31] = '\0';
-            rep.instructionPointer = frame->IP;
-            rep.codeSegment = frame->CS;
-            rep.flags = frame->Flags;
-            rep.stackPointer = frame->SP;
-            rep.stackSegment = frame->SS;
+            rep.instructionPointer = regs->IP;
+            rep.codeSegment = regs->CS;
+            rep.flags = regs->Flags;
+            rep.stackPointer = regs->SP;
+            rep.stackSegment = regs->SS;
 
             if (i == 0x0E) {
                 // Page fault: read CR2 for faulting address
@@ -215,4 +223,4 @@ namespace Hal {
     void IDTReload() {
         LoadIDT(IDTR);
     }
-};
+};