matos/userspace/main_user.c

#include "libc.h"
#include "stdarg.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");
        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 = brk(0);
        }
        printf("Testing allocation\n");
        int allocSize    = 4096 * 2;
        char *currentHeap = brk(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\n");

        return 0;
}

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;
                }
        }
        return 0;
}