matos/core/syscall.c

#include "klibc.h"
#include "stdarg.h"
#include "syscall.h"
#include "thread.h"

int syscallExecute(int syscallId, const struct cpu_state *userCtx){

    int ret;

    switch (syscallId) {
        case SYSCALL_ID_EXIT:
            uint status;
            ret = syscallGet1arg(userCtx, &status);
            if(ret != 0)
                break;
            threadExit();
            assert(0);
            break;
        case SYSCALL_ID_YOLO:
            ret = printf("YOLO FROM USERSPACE\n");
            break;
        case SYSCALL_ID_PUTC:
            unsigned int c;
            ret = syscallGet1arg(userCtx, &c);
            putc(c);
            break;
        default:
           printf("Unknon syscall id %d\n", syscallId); 
           ret = -ENOENT;
    }
    return ret;
}