/*
- * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
-#include "linux/compiler.h"
-#include "linux/stddef.h"
-#include "linux/kernel.h"
-#include "linux/string.h"
-#include "linux/fs.h"
-#include "linux/highmem.h"
-#include "asm/page.h"
-#include "asm/pgtable.h"
-#include "asm/uaccess.h"
+#include <linux/err.h>
+#include <linux/highmem.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <asm/current.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
#include "kern_util.h"
#include "os.h"
-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)
+pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr)
{
- pte_t pte;
- int err;
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ if (mm == NULL)
+ return NULL;
+
+ pgd = pgd_offset(mm, addr);
+ if (!pgd_present(*pgd))
+ return NULL;
+
+ pud = pud_offset(pgd, addr);
+ if (!pud_present(*pud))
+ return NULL;
- void *phys = um_virt_to_phys(current, virt, &pte);
- int dummy_code;
+ pmd = pmd_offset(pud, addr);
+ if (!pmd_present(*pmd))
+ return NULL;
+
+ return pte_offset_kernel(pmd, addr);
+}
+
+static pte_t *maybe_map(unsigned long virt, int is_write)
+{
+ pte_t *pte = virt_to_pte(current->mm, virt);
+ int err, dummy_code;
- if(IS_ERR(phys) || (is_write && !pte_write(pte))){
+ if ((pte == NULL) || !pte_present(*pte) ||
+ (is_write && !pte_write(*pte))) {
err = handle_page_fault(virt, 0, is_write, 1, &dummy_code);
- if(err)
- return(-1UL);
- phys = um_virt_to_phys(current, virt, NULL);
+ if (err)
+ return NULL;
+ pte = virt_to_pte(current->mm, virt);
}
- if(IS_ERR(phys))
- phys = (void *) -1;
+ if (!pte_present(*pte))
+ pte = NULL;
- return((unsigned long) phys);
+ return pte;
}
-static int do_op(unsigned long addr, int len, int is_write,
+static int do_op_one_page(unsigned long addr, int len, int is_write,
int (*op)(unsigned long addr, int len, void *arg), void *arg)
{
+ jmp_buf buf;
struct page *page;
- int n;
+ pte_t *pte;
+ int n, faulted;
+
+ pte = maybe_map(addr, is_write);
+ if (pte == NULL)
+ return -1;
- addr = maybe_map(addr, is_write);
- if(addr == -1UL)
- return(-1);
+ page = pte_page(*pte);
+ addr = (unsigned long) kmap_atomic(page, KM_UML_USERCOPY) +
+ (addr & ~PAGE_MASK);
- page = phys_to_page(addr);
- addr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
- n = (*op)(addr, len, arg);
- kunmap(page);
+ current->thread.fault_catcher = &buf;
- return(n);
+ faulted = UML_SETJMP(&buf);
+ if (faulted == 0)
+ n = (*op)(addr, len, arg);
+ else
+ n = -1;
+
+ current->thread.fault_catcher = NULL;
+
+ kunmap_atomic((void *)addr, KM_UML_USERCOPY);
+
+ return n;
}
-static void do_buffer_op(void *jmpbuf, void *arg_ptr)
+static int buffer_op(unsigned long addr, int len, int is_write,
+ int (*op)(unsigned long, int, void *), void *arg)
{
- va_list args;
- unsigned long addr;
- int len, is_write, size, remain, n;
- int (*op)(unsigned long, int, void *);
- void *arg;
- int *res;
-
- va_copy(args, *(va_list *)arg_ptr);
- addr = va_arg(args, unsigned long);
- len = va_arg(args, int);
- is_write = va_arg(args, int);
- op = va_arg(args, void *);
- arg = va_arg(args, void *);
- res = va_arg(args, int *);
- va_end(args);
+ int size, remain, n;
+
size = min(PAGE_ALIGN(addr) - addr, (unsigned long) len);
remain = len;
- current->thread.fault_catcher = jmpbuf;
- n = do_op(addr, size, is_write, op, arg);
- if(n != 0){
- *res = (n < 0 ? remain : 0);
+ n = do_op_one_page(addr, size, is_write, op, arg);
+ if (n != 0) {
+ remain = (n < 0 ? remain : 0);
goto out;
}
addr += size;
remain -= size;
- if(remain == 0){
- *res = 0;
+ if (remain == 0)
goto out;
- }
- while(addr < ((addr + remain) & PAGE_MASK)){
- n = do_op(addr, PAGE_SIZE, is_write, op, arg);
- if(n != 0){
- *res = (n < 0 ? remain : 0);
+ while (addr < ((addr + remain) & PAGE_MASK)) {
+ n = do_op_one_page(addr, PAGE_SIZE, is_write, op, arg);
+ if (n != 0) {
+ remain = (n < 0 ? remain : 0);
goto out;
}
addr += PAGE_SIZE;
remain -= PAGE_SIZE;
}
- if(remain == 0){
- *res = 0;
+ if (remain == 0)
+ goto out;
+
+ n = do_op_one_page(addr, remain, is_write, op, arg);
+ if (n != 0) {
+ remain = (n < 0 ? remain : 0);
goto out;
}
- n = do_op(addr, remain, is_write, op, arg);
- if(n != 0)
- *res = (n < 0 ? remain : 0);
- else *res = 0;
+ return 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);
+ return remain;
}
static int copy_chunk_from_user(unsigned long from, int len, void *arg)
memcpy((void *) to, (void *) from, len);
*to_ptr += len;
- return(0);
+ return 0;
}
-int copy_from_user_skas(void *to, const void __user *from, int n)
+int copy_from_user(void *to, const void __user *from, int n)
{
- if(segment_eq(get_fs(), KERNEL_DS)){
+ if (segment_eq(get_fs(), KERNEL_DS)) {
memcpy(to, (__force void*)from, n);
- return(0);
+ return 0;
}
- return(access_ok(VERIFY_READ, from, n) ?
+ return access_ok(VERIFY_READ, from, n) ?
buffer_op((unsigned long) from, n, 0, copy_chunk_from_user, &to):
- n);
+ n;
}
static int copy_chunk_to_user(unsigned long to, int len, void *arg)
memcpy((void *) to, (void *) from, len);
*from_ptr += len;
- return(0);
+ return 0;
}
-int copy_to_user_skas(void __user *to, const void *from, int n)
+int copy_to_user(void __user *to, const void *from, int n)
{
- if(segment_eq(get_fs(), KERNEL_DS)){
- memcpy((__force void*)to, from, n);
- return(0);
+ if (segment_eq(get_fs(), KERNEL_DS)) {
+ memcpy((__force void *) to, from, n);
+ return 0;
}
- return(access_ok(VERIFY_WRITE, to, n) ?
+ return access_ok(VERIFY_WRITE, to, n) ?
buffer_op((unsigned long) to, n, 1, copy_chunk_to_user, &from) :
- n);
+ n;
}
static int strncpy_chunk_from_user(unsigned long from, int len, void *arg)
n = strnlen(to, len);
*to_ptr += n;
- if(n < len)
- return(1);
- return(0);
+ if (n < len)
+ return 1;
+ return 0;
}
-int strncpy_from_user_skas(char *dst, const char __user *src, int count)
+int strncpy_from_user(char *dst, const char __user *src, int count)
{
int n;
char *ptr = dst;
- if(segment_eq(get_fs(), KERNEL_DS)){
- strncpy(dst, (__force void*)src, count);
- return(strnlen(dst, count));
+ if (segment_eq(get_fs(), KERNEL_DS)) {
+ strncpy(dst, (__force void *) src, count);
+ return strnlen(dst, count);
}
- if(!access_ok(VERIFY_READ, src, 1))
- return(-EFAULT);
+ if (!access_ok(VERIFY_READ, src, 1))
+ return -EFAULT;
n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user,
&ptr);
- if(n != 0)
- return(-EFAULT);
- return(strnlen(dst, count));
+ if (n != 0)
+ return -EFAULT;
+ return strnlen(dst, count);
}
static int clear_chunk(unsigned long addr, int len, void *unused)
{
memset((void *) addr, 0, len);
- return(0);
+ return 0;
}
-int __clear_user_skas(void __user *mem, int len)
+int __clear_user(void __user *mem, int len)
{
- return(buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL));
+ return buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL);
}
-int clear_user_skas(void __user *mem, int len)
+int clear_user(void __user *mem, int len)
{
- if(segment_eq(get_fs(), KERNEL_DS)){
+ if (segment_eq(get_fs(), KERNEL_DS)) {
memset((__force void*)mem, 0, len);
- return(0);
+ return 0;
}
- return(access_ok(VERIFY_WRITE, mem, len) ?
- buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL) : len);
+ return access_ok(VERIFY_WRITE, mem, len) ?
+ buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL) : len;
}
static int strnlen_chunk(unsigned long str, int len, void *arg)
n = strnlen((void *) str, len);
*len_ptr += n;
- if(n < len)
- return(1);
- return(0);
+ if (n < len)
+ return 1;
+ return 0;
}
-int strnlen_user_skas(const void __user *str, int len)
+int strnlen_user(const void __user *str, int len)
{
int count = 0, n;
- if(segment_eq(get_fs(), KERNEL_DS))
- return(strnlen((__force char*)str, len) + 1);
+ if (segment_eq(get_fs(), KERNEL_DS))
+ return strnlen((__force char*)str, len) + 1;
n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count);
- if(n == 0)
- return(count + 1);
- return(-EFAULT);
+ if (n == 0)
+ return count + 1;
+ return -EFAULT;
}
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
git.openpandora.org / pandora-kernel.git / blobdiff