Messages in this thread |  | | | Date | Sat, 25 Jan 1997 00:35:20 -0500 (EST) | | From | "Richard B. Johnson" <> | | Subject | Opcodes |
| |
This code (to test invd from user mode) simply produced a core-dump. This is what the trap should have done. I tried this first at home on a '486 and then tried it here (over the network) on a Pentium.
#include <stdio.h>
main() { __asm__ __volatile__( "invd" ); printf("Was not killed!"); fflush(stdout); } ------------------------------------- .file "xxx.c" .version "01.01" gcc2_compiled.: .section .rodata .LC0: .string "Was not killed!" .text .align 16 .globl main .type main,@function main: pushl %ebp movl %esp,%ebp #APP invd #NO_APP pushl $.LC0 call printf addl $4,%esp pushl $_IO_stdout_ call fflush addl $4,%esp .L1: movl %ebp,%esp popl %ebp ret .Lfe1: .size main,.Lfe1-main .ident "GCC: (GNU) 2.7.2" --------------------------------------
Cheers, Dick Johnson -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Richard B. Johnson Project Engineer Analogic Corporation Voice : (508) 977-3000 ext. 3754 Fax : (508) 532-6097 Modem : (508) 977-6870 Ftp : ftp@boneserver.analogic.com Email : rjohnson@analogic.com, johnson@analogic.com Penguin : Linux version 2.1.21 on an i586 machine (66.15 BogoMips). Warning : It's hard to remain at the trailing edge of technology. -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
|  |