matos/userspace/main_user.c
Mathieu Maret c3f3eb435e implement munmap
Also add basic errno.h
2024-02-11 00:22:41 +01:00

162 lines
4.4 KiB
C

#include "errno.h"
#include "libc.h"
#include "stdarg.h"
#include "stddef.h"
#include "sys/mman.h"
#include "tiny.h"
int func_help()
{
printf("\nAvailable Commands:\n");
printf(" help: this help\n");
printf(" suicide: userspace self kill\n");
printf(" syscall5: a syscall with parameters over the stack \n");
printf(" alloc: test allocation\n");
printf(" tiny: a tiny C-like interpreter\n");
printf(" mmap: test mmap \n");
printf(" munmap: test munmap \n");
return 0;
}
int func_suicide()
{
printf("User is about to suicide\n");
int *yolo = 0;
*yolo = 1;
return 0;
}
char *initialHeap = 0;
int func_alloc()
{
if (initialHeap == 0) {
initialHeap = sbrk(0);
}
printf("Testing allocation\n");
int allocSize = 4096 * 2;
char *currentHeap = sbrk(0);
if (currentHeap - initialHeap < allocSize) {
brk(initialHeap + allocSize);
}
int *allocatedData = (int *)initialHeap;
for (unsigned int i = 0; i < allocSize / sizeof(int); i++) {
allocatedData[i] = i;
}
printf("Success\nTesting malloc\n");
uintptr_t heap = (uintptr_t)sbrk(0);
for (int i = 0; i < 12; i++) {
void *ptr = malloc(1 << i);
printf("malloc size %d: 0x%p\n", (1 << i), ptr);
if (ptr == NULL) {
printf("Malloc failed\n");
}
memset(ptr, 0, 1 << i);
free(ptr);
}
uintptr_t newHeap = (uintptr_t)sbrk(0);
printf("Malloc used %dB\n", newHeap - heap);
return 0;
}
struct mmapedArea {
void *addr;
size_t size;
struct mmapedArea *next;
};
static struct mmapedArea *listMmap = NULL;
int func_mmap()
{
struct mmapedArea *area = (struct mmapedArea *)malloc(sizeof(struct mmapedArea));
if (area == NULL) {
printf("Fail to allocate area\n");
return -1;
}
char *path = "/dev/zero";
void *mapAddr = mmap((void *)0, 4096, PROT_READ | PROT_WRITE, 0, path);
if (mapAddr == MAP_FAILED) {
printf("mmap failed errno %d\n", errno);
return -1;
}
printf("Zero mmaped at %p\n", mapAddr);
int data = *(int *)mapAddr;
*(int *)mapAddr = data;
area->addr = mapAddr;
area->size = 4096;
area->next = listMmap;
listMmap = area;
return 0;
}
int func_munmap()
{
if (!listMmap) {
printf("Nothing to unmap... mmap first! \n");
return -1;
}
struct mmapedArea *area = listMmap;
int ret = munmap(area->addr, area->size);
if (ret) {
printf("Fail to unmap area at 0x%p (size %d) error %d\n", area->addr, area->size, ret);
return ret;
}
printf("unmap done\n");
listMmap = listMmap->next;
free(area);
return ret;
}
int main(int argc, char *argv[])
{
(void)argc;
(void)argv;
char buf[64];
printf("Shell starting... type \"help\" for help\n");
while (1) {
printf(">");
if (readline(buf, sizeof(buf)))
continue;
if (strcmp(buf, "help") == 0) {
func_help();
continue;
}
if (strcmp(buf, "suicide") == 0) {
func_suicide();
continue;
}
if (strcmp(buf, "syscall5") == 0) {
testSycall5(1, 2, 3, 4, 5);
continue;
}
if (strcmp(buf, "alloc") == 0) {
func_alloc();
continue;
}
if (strcmp(buf, "tiny") == 0) {
func_tiny();
continue;
}
if (strcmp(buf, "mmap") == 0) {
func_mmap();
continue;
}
if (strcmp(buf, "munmap") == 0) {
func_munmap();
continue;
}
}
return 0;
}