Difference between revisions of "Xv6 homework 6"
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Assignment: In xv6, set a breakpoint at the beginning of syscall() to catch the very first system call. What values are on the stack at this point? Turn in the output of print-stack 35 at that breakpoint with each value labeled as to what it is (e.g., saved %ebp for trap, trapframe.eip, etc.). | Assignment: In xv6, set a breakpoint at the beginning of syscall() to catch the very first system call. What values are on the stack at this point? Turn in the output of print-stack 35 at that breakpoint with each value labeled as to what it is (e.g., saved %ebp for trap, trapframe.eip, etc.). | ||
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Latest revision as of 14:57, 30 December 2018
Since this has gone missing...
Lecture 6 homework: xv6 and Interrupts and Exceptions Handed out: Wednesday, September 21, 2005 Due: Wednesday, September 28, Oct 3, 2005 Read: trapasm.C, trap.c, syscall.c, vectors.S, usys.c of xv6. Skim lapic.c, ioapic.c, and picirq.c Hand-In Procedure You are to turn in this homework during lecture. Please write up your answers to the exercises below and hand them in to a 6.828 staff member at the beginning of the lecture. Introduction Try to understand trapasm.C, trap.c, syscall.c, vectors.S, usys.c of xv6. You will need to consult: Chapter 5 of IA-32 Intel Architecture Software Developer's Manual, Volume 3: System programming guide; you can skip sections 5.7.1, 5.8.2, and 5.12.2. Be aware that terms such as exceptions, traps, interrupts, faults and aborts have no standardized meaning. Chapter 9 of the 1987 i386 Programmer's Reference Manual also covers exception and interrupt handling in IA32 processors. Assignment: In xv6, set a breakpoint at the beginning of syscall() to catch the very first system call. What values are on the stack at this point? Turn in the output of print-stack 35 at that breakpoint with each value labeled as to what it is (e.g., saved %ebp for trap, trapframe.eip, etc.). This completes the homework.
