No longer builds, but this is a good intermediate save point.
[akaros.git] / kern / arch / x86 / trap64.c
index af06e27..754c90b 100644 (file)
 #include <kdebug.h>
 #include <kmalloc.h>
 
-/* Starts running the current TF, just using ret. */
-void pop_kernel_ctx(struct kernel_ctx *ctx)
-{
-       #if 0
-       asm volatile ("movl %1,%%esp;           " /* move to future stack */
-                     "pushl %2;                " /* push cs */
-                     "movl %0,%%esp;           " /* move to TF */
-                     "addl $0x20,%%esp;        " /* move to tf_gs slot */
-                     "movl %1,(%%esp);         " /* write future esp */
-                     "subl $0x20,%%esp;        " /* move back to tf start */
-                     "popal;                   " /* restore regs */
-                     "popl %%esp;              " /* set stack ptr */
-                     "subl $0x4,%%esp;         " /* jump down past CS */
-                     "ret                      " /* return to the EIP */
-                     :
-                     : "g"(&ctx->hw_tf), "r"(ctx->hw_tf.tf_esp),
-                       "r"(ctx->hw_tf.tf_eip)
-                     : "memory");
-       #endif
-       panic("ret failed");
-}
-
 void print_trapframe(struct hw_trapframe *hw_tf)
 {
        static spinlock_t ptf_lock = SPINLOCK_INITIALIZER_IRQSAVE;
@@ -53,9 +31,9 @@ void print_trapframe(struct hw_trapframe *hw_tf)
        /* This is only called in debug scenarios, and often when the kernel trapped
         * and needs to tell us about it.  Disable the lock checker so it doesn't go
         * nuts when we print/panic */
-       pcpui->__lock_depth_disabled++;
+       pcpui->__lock_checking_enabled--;
        spin_lock_irqsave(&ptf_lock);
-       printk("TRAP frame at %p on core %d\n", hw_tf, core_id());
+       printk("HW TRAP frame at %p on core %d\n", hw_tf, core_id());
        printk("  rax  0x%016lx\n",           hw_tf->tf_rax);
        printk("  rbx  0x%016lx\n",           hw_tf->tf_rbx);
        printk("  rcx  0x%016lx\n",           hw_tf->tf_rcx);
@@ -74,7 +52,10 @@ void print_trapframe(struct hw_trapframe *hw_tf)
        printk("  trap 0x%08x %s\n",          hw_tf->tf_trapno,
                                              x86_trapname(hw_tf->tf_trapno));
        /* FYI: these aren't physically adjacent to trap and err */
-       printk("  gsbs 0x%016lx\n",           hw_tf->tf_gsbase);
+       if (hw_tf->tf_cs == GD_KT)
+               printk("  gsbs 0x%016lx\n",       read_msr(MSR_GS_BASE));
+       else
+               printk("  gsbs 0x%016lx\n",       hw_tf->tf_gsbase);
        printk("  fsbs 0x%016lx\n",           hw_tf->tf_fsbase);
        printk("  err  0x--------%08x\n",     hw_tf->tf_err);
        printk("  rip  0x%016lx\n",           hw_tf->tf_rip);
@@ -83,7 +64,7 @@ void print_trapframe(struct hw_trapframe *hw_tf)
        printk("  rsp  0x%016lx\n",           hw_tf->tf_rsp);
        printk("  ss   0x------------%04x\n", hw_tf->tf_ss);
        spin_unlock_irqsave(&ptf_lock);
-       pcpui->__lock_depth_disabled--;
+       pcpui->__lock_checking_enabled++;
 
        /* Used in trapentry64.S */
        static_assert(offsetof(struct hw_trapframe, tf_cs) - 
@@ -92,35 +73,37 @@ void print_trapframe(struct hw_trapframe *hw_tf)
        static_assert(offsetof(struct per_cpu_info, stacktop) == 0);
 }
 
-void page_fault_handler(struct hw_trapframe *hw_tf)
+void print_swtrapframe(struct sw_trapframe *sw_tf)
 {
-       uintptr_t fault_va = rcr2();
-       int prot = hw_tf->tf_err & PF_ERROR_WRITE ? PROT_WRITE : PROT_READ;
-       int err;
+       static spinlock_t ptf_lock = SPINLOCK_INITIALIZER_IRQSAVE;
+       struct per_cpu_info *pcpui = &per_cpu_info[core_id()];
+       pcpui->__lock_checking_enabled--;
+       spin_lock_irqsave(&ptf_lock);
+       printk("SW TRAP frame at %p on core %d\n", sw_tf, core_id());
+       printk("  rbx  0x%016lx\n",           sw_tf->tf_rbx);
+       printk("  rbp  0x%016lx\n",           sw_tf->tf_rbp);
+       printk("  r12  0x%016lx\n",           sw_tf->tf_r12);
+       printk("  r13  0x%016lx\n",           sw_tf->tf_r13);
+       printk("  r14  0x%016lx\n",           sw_tf->tf_r14);
+       printk("  r15  0x%016lx\n",           sw_tf->tf_r15);
+       printk("  gsbs 0x%016lx\n",           sw_tf->tf_gsbase);
+       printk("  fsbs 0x%016lx\n",           sw_tf->tf_fsbase);
+       printk("  rip  0x%016lx\n",           sw_tf->tf_rip);
+       printk("  rsp  0x%016lx\n",           sw_tf->tf_rsp);
+       printk(" mxcsr 0x%08x\n",             sw_tf->tf_mxcsr);
+       printk(" fpucw 0x%04x\n",             sw_tf->tf_fpucw);
+       spin_unlock_irqsave(&ptf_lock);
+       pcpui->__lock_checking_enabled++;
+}
 
-       /* TODO - handle kernel page faults */
-       if ((hw_tf->tf_cs & 3) == 0) {
-               print_trapframe(hw_tf);
-               panic("Page Fault in the Kernel at 0x%08x!", fault_va);
-               /* if we want to do something like kill a process or other code, be
-                * aware we are in a sort of irq-like context, meaning the main kernel
-                * code we 'interrupted' could be holding locks - even irqsave locks. */
-       }
-       /* safe to reenable after rcr2 */
-       enable_irq();
-       if ((err = handle_page_fault(current, fault_va, prot))) {
-               /* Destroy the faulting process */
-               printk("[%08x] user %s fault va %08x ip %08x on core %d with err %d\n",
-                      current->pid, prot & PROT_READ ? "READ" : "WRITE", fault_va,
-                      hw_tf->tf_rip, core_id(), err);
-               print_trapframe(hw_tf);
-               /* Turn this on to help debug bad function pointers */
-               printd("rsp %p\n\t 0(rsp): %p\n\t 8(rsp): %p\n\t 16(rsp): %p\n"
-                      "\t24(rsp): %p\n", hw_tf->tf_rsp,
-                      *(uintptr_t*)(hw_tf->tf_rsp +  0),
-                      *(uintptr_t*)(hw_tf->tf_rsp +  8),
-                      *(uintptr_t*)(hw_tf->tf_rsp + 16),
-                      *(uintptr_t*)(hw_tf->tf_rsp + 24));
-               proc_destroy(current);
-       }
+void __arch_reflect_trap_hwtf(struct hw_trapframe *hw_tf, unsigned int trap_nr,
+                              unsigned int err, unsigned long aux)
+{
+       hw_tf->tf_trapno = trap_nr;
+       /* this can be necessary, since hw_tf is the pcpui one, and the err that
+        * came in probably came from the kernel stack's hw_tf. */
+       hw_tf->tf_err = err;
+       hw_tf->tf_padding4 = (uint32_t)(aux);
+       hw_tf->tf_padding5 = (uint32_t)(aux >> 32);
+       hw_tf->tf_padding3 = ROS_ARCH_REFL_ID;
 }