hw/i386.reference/s09_09.htm

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   4 <TITLE>80386 Programmer's Reference Manual -- Section 9.9</TITLE>
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   7 <B>up:</B> <A HREF="c09.htm">
   8 Chapter 9 -- Exceptions and Interrupts</A><BR>
   9 <B>prev:</B> <A HREF="s09_08.htm">9.8  Exception Conditions</A><BR>
  10 <B>next:</B> <A HREF="s09_10.htm">9.10  Error Code Summary</A>
  11 <P>
  12 <HR>
  13 <P>
  14 <H1>9.9  Exception Summary</H1>
  15 Table 9-6 summarizes the exceptions recognized by the 386.
  16 <PRE>
  17 Table 9-6. Exception Summary
  18
  19 Description               Interrupt   Return Address  Exception     Function That Can Generate
  20 Number      Points to       Type          the Exception
  21 Faulting
  22 Instruction
  23
  24 Divide error               0          YES             FAULT         DIV, IDIV
  25 Debug exceptions           1
  26 Some debug exceptions are traps and some are faults.  The exception
  27 handler can determine which has occurred by examining DR6.  (Refer to <A HREF="c12.htm">Chapter 12</A>.)
  28 Some debug exceptions are traps and some are faults.  The exception
  29 handler can determine which has occurred by examining DR6.  (Refer to <A HREF="c12.htm">Chapter 12</A>.) Any instruction
  30 Breakpoint                 3          NO              TRAP          One-byte INT 3
  31 Overflow                   4          NO              TRAP          INTO
  32 Bounds check               5          YES             FAULT         BOUND
  33 Invalid opcode             6          YES             FAULT         Any illegal instruction
  34 Coprocessor not available  7          YES             FAULT         ESC, WAIT
  35 Double fault               8          YES             ABORT         Any instruction that can
  36 generate an exception
  37 Coprocessor Segment
  38 Overrun                    9          NO              ABORT         Any operand of an ESC
  39 instruction that wraps around
  40 the end of a segment.
  41 Invalid TSS               10          YES             FAULT
  42 An invalid-TSS fault is not restartable if it occurs during the
  43 processing of an external interrupt.        JMP, CALL, IRET, any interrupt
  44 Segment not present       11          YES             FAULT         Any segment-register modifier
  45 Stack exception           12          YES             FAULT         Any memory reference thru SS
  46 General Protection        13          YES             FAULT/ABORT
  47 All GP faults are restartable. If the fault occurs while attempting to
  48 vector to the handler for an external interrupt, the interrupted program is
  49 restartable, but the interrupt may be lost.  Any memory reference or code
  50 fetch
  51 Page fault                14          YES             FAULT         Any memory reference or code
  52 fetch
  53 Coprocessor error         16          YES             FAULT
  54 Coprocessor errors are reported as a fault on the first ESC or WAIT
  55 instruction executed after the ESC instruction that caused the error.        ESC, WAIT
  56 Two-byte SW Interrupt     0-255       NO              TRAP          INT n
  57 </PRE>
  58 <P>
  59 <HR>
  60 <P>
  61 <B>up:</B> <A HREF="c09.htm">
  62 Chapter 9 -- Exceptions and Interrupts</A><BR>
  63 <B>prev:</B> <A HREF="s09_08.htm">9.8  Exception Conditions</A><BR>
  64 <B>next:</B> <A HREF="s09_10.htm">9.10  Error Code Summary</A>
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