-/*
+/*
* Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
* Licensed under the GPL
*/
#include "asm/pgtable.h"
#include "asm/uaccess.h"
#include "kern_util.h"
+#include "user_util.h"
-extern void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
+extern void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
pte_t *pte_out);
static unsigned long maybe_map(unsigned long virt, int is_write)
int dummy_code;
if(IS_ERR(phys) || (is_write && !pte_write(pte))){
- err = handle_page_fault(virt, 0, is_write, 0, &dummy_code);
+ err = handle_page_fault(virt, 0, is_write, 1, &dummy_code);
if(err)
return(0);
phys = um_virt_to_phys(current, virt, NULL);
return((unsigned long) phys);
}
-static int do_op(unsigned long addr, int len, int is_write,
+static int do_op(unsigned long addr, int len, int is_write,
int (*op)(unsigned long addr, int len, void *arg), void *arg)
{
struct page *page;
return(n);
}
-static int buffer_op(unsigned long addr, int len, int is_write,
- int (*op)(unsigned long addr, int len, void *arg),
- void *arg)
+static void do_buffer_op(void *jmpbuf, void *arg_ptr)
{
+ va_list args = *((va_list *) arg_ptr);
+ unsigned long addr = va_arg(args, unsigned long);
+ int len = va_arg(args, int);
+ int is_write = va_arg(args, int);
+ int (*op)(unsigned long, int, void *) = va_arg(args, void *);
+ void *arg = va_arg(args, void *);
+ int *res = va_arg(args, int *);
int size = min(PAGE_ALIGN(addr) - addr, (unsigned long) len);
int remain = len, n;
+ current->thread.fault_catcher = jmpbuf;
n = do_op(addr, size, is_write, op, arg);
- if(n != 0)
- return(n < 0 ? remain : 0);
+ if(n != 0){
+ *res = (n < 0 ? remain : 0);
+ goto out;
+ }
addr += size;
remain -= size;
- if(remain == 0)
- return(0);
+ if(remain == 0){
+ *res = 0;
+ goto out;
+ }
while(addr < ((addr + remain) & PAGE_MASK)){
n = do_op(addr, PAGE_SIZE, is_write, op, arg);
- if(n != 0)
- return(n < 0 ? remain : 0);
+ if(n != 0){
+ *res = (n < 0 ? remain : 0);
+ goto out;
+ }
addr += PAGE_SIZE;
remain -= PAGE_SIZE;
}
- if(remain == 0)
- return(0);
+ if(remain == 0){
+ *res = 0;
+ goto out;
+ }
n = do_op(addr, remain, is_write, op, arg);
if(n != 0)
- return(n < 0 ? remain : 0);
- return(0);
+ *res = (n < 0 ? remain : 0);
+ else *res = 0;
+ out:
+ current->thread.fault_catcher = NULL;
+}
+
+static int buffer_op(unsigned long addr, int len, int is_write,
+ int (*op)(unsigned long addr, int len, void *arg),
+ void *arg)
+{
+ int faulted, res;
+
+ faulted = setjmp_wrapper(do_buffer_op, addr, len, is_write, op, arg,
+ &res);
+ if(!faulted)
+ return(res);
+
+ return(addr + len - (unsigned long) current->thread.fault_addr);
}
static int copy_chunk_from_user(unsigned long from, int len, void *arg)
n = strnlen(to, len);
*to_ptr += n;
- if(n < len)
+ if(n < len)
return(1);
return(0);
}
if(!access_ok_skas(VERIFY_READ, src, 1))
return(-EFAULT);
- n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user,
+ n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user,
&ptr);
if(n != 0)
return(-EFAULT);
return(0);
}
- return(access_ok_skas(VERIFY_WRITE, mem, len) ?
+ return(access_ok_skas(VERIFY_WRITE, mem, len) ?
buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL) : len);
}