copy.c

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/*
 * Copyright (c) 2006-2023 Ali Mashtizadeh
 * All rights reserved.
 * Generic Copyin/Copyout routines
 */
 
#include <stdbool.h>
#include <stdint.h>
 
#include <errno.h>
 
#include <sys/kassert.h>
#include <machine/pmap.h>
 
extern int copy_unsafe(void *to_addr, void *from_addr, uintptr_t len);
extern int copystr_unsafe(void *to_addr, void *from_addr, uintptr_t len);
 
int
Copy_In(uintptr_t fromuser, void *tokernel, uintptr_t len)
{
    if (len == 0)
        return 0;
 
    // Kernel space
    if (fromuser >= MEM_USERSPACE_TOP) {
        kprintf("Copy_In: address exceeds userspace top\n");
        return EFAULT;
    }
 
    // Wrap around
    if (len > (MEM_USERSPACE_TOP - fromuser)) {
        kprintf("Copy_In: length exceeds userspace top\n");
        return EFAULT;
    }
 
    return copy_unsafe(tokernel, (void *)fromuser, len);
}
 
int
Copy_Out(void *fromkernel, uintptr_t touser, uintptr_t len)
{
    if (len == 0)
        return 0;
 
    // Kernel space
    if (touser >= MEM_USERSPACE_TOP) {
        kprintf("Copy_Out: address exceeds userspace top\n");
        return EFAULT;
    }
 
    // Wrap around
    if (len > (MEM_USERSPACE_TOP - touser)) {
        kprintf("Copy_Out: length exceeds userspace top\n");
        return EFAULT;
    }
 
    return copy_unsafe((void *)touser, fromkernel, len);
}
 
int
Copy_StrIn(uintptr_t fromuser, void *tokernel, uintptr_t len)
{
    if (len == 0)
        return 0;
 
    // Kernel space
    if (fromuser >= MEM_USERSPACE_TOP) {
        kprintf("Copy_StrIn: address exceeds userspace top\n");
        return EFAULT;
    }
 
    // Wrap around
    if (len > (MEM_USERSPACE_TOP - fromuser)) {
        kprintf("Copy_StrIn: length exceeds userspace top\n");
        return EFAULT;
    }
 
    return copystr_unsafe(tokernel, (void *)fromuser, len);
}
 
int
Copy_StrOut(void *fromkernel, uintptr_t touser, uintptr_t len)
{
    if (len == 0)
        return 0;
 
    // Kernel space
    if (touser >= MEM_USERSPACE_TOP) {
        kprintf("Copy_StrOut: address exceeds userspace top\n");
        return EFAULT;
    }
 
    // Wrap around
    if (len > (MEM_USERSPACE_TOP - touser)) {
        kprintf("Copy_StrOut: length exceeds userspace top\n");
        return EFAULT;
    }
 
    return copystr_unsafe((void *)touser, fromkernel, len);
}