* Licensed under the GPL
*/
-#include <setjmp.h>
#include <string.h>
#include "user_util.h"
#include "uml_uaccess.h"
+#include "task.h"
+#include "kern_util.h"
+#include "os.h"
+#include "longjmp.h"
int __do_copy_from_user(void *to, const void *from, int n,
void **fault_addr, void **fault_catcher)
{
+ struct tt_regs save = TASK_REGS(get_current())->tt;
unsigned long fault;
int faulted;
fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
__do_copy, &faulted);
- if(!faulted) return(0);
- else return(n - (fault - (unsigned long) from));
+ TASK_REGS(get_current())->tt = save;
+
+ if(!faulted)
+ return 0;
+ else if (fault)
+ return n - (fault - (unsigned long) from);
+ else
+ /* In case of a general protection fault, we don't have the
+ * fault address, so NULL is used instead. Pretend we didn't
+ * copy anything. */
+ return n;
}
static void __do_strncpy(void *dst, const void *src, int count)
int __do_strncpy_from_user(char *dst, const char *src, unsigned long count,
void **fault_addr, void **fault_catcher)
{
+ struct tt_regs save = TASK_REGS(get_current())->tt;
unsigned long fault;
int faulted;
fault = __do_user_copy(dst, src, count, fault_addr, fault_catcher,
__do_strncpy, &faulted);
+ TASK_REGS(get_current())->tt = save;
+
if(!faulted) return(strlen(dst));
else return(-1);
}
int __do_clear_user(void *mem, unsigned long len,
void **fault_addr, void **fault_catcher)
{
+ struct tt_regs save = TASK_REGS(get_current())->tt;
unsigned long fault;
int faulted;
fault = __do_user_copy(mem, NULL, len, fault_addr, fault_catcher,
__do_clear, &faulted);
+ TASK_REGS(get_current())->tt = save;
+
if(!faulted) return(0);
else return(len - (fault - (unsigned long) mem));
}
int __do_strnlen_user(const char *str, unsigned long n,
void **fault_addr, void **fault_catcher)
{
+ struct tt_regs save = TASK_REGS(get_current())->tt;
int ret;
unsigned long *faddrp = (unsigned long *)fault_addr;
jmp_buf jbuf;
*fault_catcher = &jbuf;
- if(setjmp(jbuf) == 0){
+ if(UML_SETJMP(&jbuf) == 0)
ret = strlen(str) + 1;
- }
- else {
- ret = *faddrp - (unsigned long) str;
- }
+ else ret = *faddrp - (unsigned long) str;
+
*fault_addr = NULL;
*fault_catcher = NULL;
+
+ TASK_REGS(get_current())->tt = save;
return ret;
}