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[Qemu-devel] [Bug 796480] Re: Addresses with 4GB differences are conside
From: |
Thomas Huth |
Subject: |
[Qemu-devel] [Bug 796480] Re: Addresses with 4GB differences are consider as one single address in QEMU |
Date: |
Wed, 07 Jun 2017 08:41:30 -0000 |
Can you still reproduce this problem with the latest version of QEMU
(currently version 2.9.0)?
** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/796480
Title:
Addresses with 4GB differences are consider as one single address in
QEMU
Status in QEMU:
Incomplete
Bug description:
THIS IS THE ISSUE OF USER MODE EMULATION
Information about guest and host
**********************************
guest: 64 bit x86 user mode binary
host: 32 bit Linux OS
uname -a :Linux KICS-HPCNL-32blue 2.6.33.3-85.fc13.i686.PAE #1 SMP
architecture: intel64
Bug Description
****************
for memory reference instructions, suppose I have two addresses in guest
address space(64 bit)
0x220000000
0x320000000
as lower 32 bit part of both addresses are same, when particular instructions
are translated into host code(32 bit)
in both above cases the value is loaded from same memory and we get same
value. where actual behaviour was to get two different values.
here is the program which i used to test:
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#define SIZE 4294967297 /* 4Gib*/
int main() {
char *array;
unsigned int i;
array = malloc(sizeof(char) * SIZE);
if(array == NULL) {
fprintf(stderr, "Could not allocate that much memory");
return 1; }
array[0] = 'a';
array[SIZE-1] = 'z';
printf("array[SIZE-1] = %c array[0] = %c\n",array[SIZE-1], array[0]);
return 0;
}
I have 8 gib RAM
I compiled this program on 64 bit linux and run this on 32 bit linux with
qemu
QEMU command line and output
**********************************
$x86_64-linux-user/qemu-x86_64 ~/ar_x86
output: array[SIZE-1] = z,array[0] = z
Release information
********************
x86_64 binary is tested with latest release : qemu-0.14.1
and with current development tree as well( live code of QEMU using git)
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