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Grammar: trying to execut{ing => e} (#510)

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OddCoincidence
2018-12-29 00:19:37 -08:00
committed by Philipp Oppermann
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blog/content/second-edition/posts/06-cpu-exceptions/index.md
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@@ -24,7 +24,7 @@ On x86 there are about 20 different CPU exception types. The most important are:
- **Page Fault**: A page fault occurs on illegal memory accesses. For example, if the current instruction tries to read from an unmapped page or tries to write to a read-only page.
- **Invalid Opcode**: This exception occurs when the current instruction is invalid, for example when we try to use newer [SSE instructions] on an old CPU that does not support them.
- **General Protection Fault**: This is the exception with the broadest range of causes. It occurs on various kinds of access violations such as trying to executing a privileged instruction in user level code or writing reserved fields in configuration registers.
- **General Protection Fault**: This is the exception with the broadest range of causes. It occurs on various kinds of access violations such as trying to execute a privileged instruction in user level code or writing reserved fields in configuration registers.
- **Double Fault**: When an exception occurs, the CPU tries to call the corresponding handler function. If another exception occurs _while calling the exception handler_, the CPU raises a double fault exception. This exception also occurs when there is no handler function registered for an exception.
- **Triple Fault**: If an exception occurs while the CPU tries to call the double fault handler function, it issues a fatal _triple fault_. We can't catch or handle a triple fault. Most processors react by resetting themselves and rebooting the operating system.