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Adjust sbrk test for large user address spaces

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All tests pass
This commit is contained in:
Frans Kaashoek 2011-08-07 23:03:48 -04:00
parent 67d4254d15
commit 6479766334
2 changed files with 10 additions and 21 deletions
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25
usertests.c
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@ -5,6 +5,7 @@
#include "fcntl.h"
#include "syscall.h"
#include "traps.h"
#include "memlayout.h"
char buf[2048];
char name[3];
@ -1271,24 +1272,18 @@ sbrktest(void)
exit();
wait();
// can one allocate the full 640K?
// can one grow address space to something big?
#define BIG (100*1024*1024)
a = sbrk(0);
amt = (640 * 1024) - (uint)a;
amt = (BIG) - (uint)a;
p = sbrk(amt);
if (p != a) {
printf(stdout, "sbrk test failed 640K test, p %x a %x\n", p, a);
printf(stdout, "sbrk test failed to grow big address space; enough phys mem?\n");
exit();
}
lastaddr = (char*)(640 * 1024 - 1);
lastaddr = (char*) (BIG-1);
*lastaddr = 99;
// is one forbidden from allocating more than 640K?
c = sbrk(4096);
if(c != (char*)0xffffffff){
printf(stdout, "sbrk allocated more than 640K, c %x\n", c);
exit();
}
// can one de-allocate?
a = sbrk(0);
c = sbrk(-4096);
@ -1315,14 +1310,8 @@ sbrktest(void)
exit();
}
c = sbrk(4096);
if(c != (char*)0xffffffff){
printf(stdout, "sbrk was able to re-allocate beyond 640K, c %x\n", c);
exit();
}
// can we read the kernel's memory?
for(a = (char*)(640*1024); a < (char*)2000000; a += 50000){
for(a = (char*)(KERNBASE); a < (char*) (KERNBASE+2000000); a += 50000){
ppid = getpid();
pid = fork();
if(pid < 0){

2
vm.c
View file

@ -158,7 +158,7 @@ mappages(pde_t *pgdir, void *la, uint size, uint pa, int perm)
//
//
// setupkvm() and exec() set up every page table like this:
// 0..KERNBASE : user memory (text, data, stack, heap), mapped to some phys mem
// 0..USERTOP : user memory (text, data, stack, heap), mapped to some phys mem
// KERNBASE+640K..KERNBASE+1M: mapped to 640K..1M
// KERNBASE+1M..KERNBASE+end : mapped to 1M..end
// KERNBASE+end..KERBASE+PHYSTOP : mapped to end..PHYSTOP (free memory)