Kernel: Interpret "reserved bit violation" page faults correctly

We don't actually react to these in any meaningful way other than crashing, but let's at least print the correct information. :^)
fleximus · Dec 25, 2019 · c22a430 · c22a430
1 parent 52deb09
commit c22a430
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/Kernel/Arch/i386/CPU.cpp b/Kernel/Arch/i386/CPU.cpp
@@ -279,10 +279,11 @@ void page_fault_handler(RegisterDump regs)
  return;
  }
 
- kprintf("\033[31;1m%s(%u:%u) Unrecoverable page fault, %s%s address %p\033[0m\n",
+ kprintf("\033[31;1m%s(%u:%u) Unrecoverable page fault, %s%s%s address %p\033[0m\n",
  current->process().name().characters(),
  current->pid(),
  current->tid(),
+ regs.exception_code & PageFaultFlags::ReservedBitViolation ? "reserved bit violation / " : "",
  regs.exception_code & PageFaultFlags::InstructionFetch ? "instruction fetch / " : "",
  regs.exception_code & PageFaultFlags::Write ? "write to" : "read from",
  fault_address);

diff --git a/Kernel/Arch/i386/CPU.h b/Kernel/Arch/i386/CPU.h
@@ -348,7 +348,8 @@ struct PageFaultFlags {
  Write = 0x02,
  UserMode = 0x04,
  SupervisorMode = 0x00,
- InstructionFetch = 0x08,
+ ReservedBitViolation = 0x08,
+ InstructionFetch = 0x10,
  };
 };