Gpf Error Code
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Stack-Segment Fault 1.1.8 General Protection Fault 1.1.9 Page Fault 1.1.9.1 Error code 1.1.10 x87 Floating-Point Exception 1.1.11 Alignment Check 1.1.12 SIMD Floating-Point Exception 1.2 Traps 1.2.1 Debug 1.2.2 Breakpoint 1.2.3 Overflow 1.3 Aborts 1.3.1 Double Fault 1.3.2 Machine Check linux general protection fault 1.3.3 Triple Fault 2 Selector Error Code 2.1 Legacy 2.1.1 FPU Error Interrupt 2.1.2 page fault error code Coprocessor Segment Overrun 3 See Also 3.1 External Links Exceptions as described in this article are generated by the CPU when an
Gpf Not Handled Opcode From V86
'error' occurs. Some exceptions are not really errors in most cases, such as page faults. Exceptions are a type of interrupt. Exceptions are classified as: Faults: These can be corrected and the program may continue as if
General Protection Fault Fix
nothing happened. Traps: Traps are reported immediately after the execution of the trapping instruction. Aborts: Some severe unrecoverable error. Some exceptions will push a 32-bit "error code" on to the top of the stack, which provides additional information about the error. This value must be pulled from the stack before returning control back to the currently running program. (i.e. before calling IRET) Name Vector nr. Type Mnemonic Error code? Divide-by-zero Error 0 (0x0) exception 13 general protection fault Fault #DE No Debug 1 (0x1) Fault/Trap #DB No Non-maskable Interrupt 2 (0x2) Interrupt - No Breakpoint 3 (0x3) Trap #BP No Overflow 4 (0x4) Trap #OF No Bound Range Exceeded 5 (0x5) Fault #BR No Invalid Opcode 6 (0x6) Fault #UD No Device Not Available 7 (0x7) Fault #NM No Double Fault 8 (0x8) Abort #DF Yes (Zero) Coprocessor Segment Overrun 9 (0x9) Fault - No Invalid TSS 10 (0xA) Fault #TS Yes Segment Not Present 11 (0xB) Fault #NP Yes Stack-Segment Fault 12 (0xC) Fault #SS Yes General Protection Fault 13 (0xD) Fault #GP Yes Page Fault 14 (0xE) Fault #PF Yes Reserved 15 (0xF) - - No x87 Floating-Point Exception 16 (0x10) Fault #MF No Alignment Check 17 (0x11) Fault #AC Yes Machine Check 18 (0x12) Abort #MC No SIMD Floating-Point Exception 19 (0x13) Fault #XM/#XF No Virtualization Exception 20 (0x14) Fault #VE No Reserved 21-29 (0x15-0x1D) - - No Security Exception 30 (0x1E) - #SX Yes Reserved 31 (0x1F) - - No Triple Fault - - - No FPU Error Interrupt IRQ 13 Interrupt #FERR No Exceptions Faults Divide-by-zero Error The Divide-by-zero Error occurs when dividing any number by 0 using the DIV or IDIV instruction. Many OS developers use this exception to test whether their exception handling code works. This exception m
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X86 Exceptions
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with http://stackoverflow.com/questions/491613/do-i-have-to-pop-the-error-code-pushed-to-stack-by-certain-exceptions-before-ret us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Do I have to pop the error code pushed to stack by certain exceptions before returning from the interrupt handler? up vote 6 down vote favorite 1 I have loaded an idt table with 256 entries, all pointing to similar handlers: for general protection exceptions 8 and 10-14, push the exception number (these exceptions push an error code automatically) for the others, push a "dummy" error code and the exception number; then jump to a common handler So when the common handler enters, the stack is properly aligned and contains the exception/interrupt number, error code (which may just be a dummy), eflags, cs and eip. My question regards returning from the interrupt handler. I use iret to return after taking out the exception number and the error code general protection fault from the stack, but this doesn't work for exception nr 8; if I leave the error code on the stack, then it returns fine! Questions: do I have to leave the error code on the stack for exceptions that put the error code there? If so, how does iret determine whether it has to pop an error code or not? as soon as I enable interrupts I always get exception 8 (double fault), but then everything runs fine (I'm developing a hobby OS). Is this normal behavior or do I have a bug somewhere? assembly operating-system x86 interrupt osdev share|improve this question edited Oct 28 '15 at 18:11 Ciro Santilli 烏坎事件2016六四事件 法轮功 52.5k10225166 asked Jan 29 '09 at 13:38 Joao da Silva 4,8731822 Also, pointers to the intel manuals would be most welcome :) I haven't found anything regarding these problems there yet. –Joao da Silva Jan 29 '09 at 13:39 add a comment| 4 Answers 4 active oldest votes up vote 10 down vote accepted If the CPU pushed an error code automatically, the handler must pop it before the iret. The iret instruction doesn't know where you're coming from, if it's a fault, a trap or an external interrupt. It always does the same, and it assumes that there's no error code on the stack. Quoting from the SDM (Software Developer's Manual), Volume 3, Chapter 5, section 5.13 titled Error Code: The error code is pushed on the stack as a doubleword or word (depending on th