107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
/*
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* Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
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* Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <setjmp.h>
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#include <string.h>
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#include "user_util.h"
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#include "uml_uaccess.h"
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#include "task.h"
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#include "kern_util.h"
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#include "os.h"
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int __do_copy_from_user(void *to, const void *from, int n,
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void **fault_addr, void **fault_catcher)
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{
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struct tt_regs save = TASK_REGS(get_current())->tt;
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unsigned long fault;
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int faulted;
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fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
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__do_copy, &faulted);
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TASK_REGS(get_current())->tt = save;
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if(!faulted)
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return 0;
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else if (fault)
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return n - (fault - (unsigned long) from);
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else
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/* In case of a general protection fault, we don't have the
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* fault address, so NULL is used instead. Pretend we didn't
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* copy anything. */
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return n;
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}
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static void __do_strncpy(void *dst, const void *src, int count)
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{
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strncpy(dst, src, count);
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}
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int __do_strncpy_from_user(char *dst, const char *src, unsigned long count,
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void **fault_addr, void **fault_catcher)
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{
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struct tt_regs save = TASK_REGS(get_current())->tt;
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unsigned long fault;
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int faulted;
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fault = __do_user_copy(dst, src, count, fault_addr, fault_catcher,
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__do_strncpy, &faulted);
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TASK_REGS(get_current())->tt = save;
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if(!faulted) return(strlen(dst));
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else return(-1);
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}
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static void __do_clear(void *to, const void *from, int n)
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{
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memset(to, 0, n);
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}
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int __do_clear_user(void *mem, unsigned long len,
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void **fault_addr, void **fault_catcher)
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{
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struct tt_regs save = TASK_REGS(get_current())->tt;
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unsigned long fault;
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int faulted;
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fault = __do_user_copy(mem, NULL, len, fault_addr, fault_catcher,
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__do_clear, &faulted);
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TASK_REGS(get_current())->tt = save;
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if(!faulted) return(0);
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else return(len - (fault - (unsigned long) mem));
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}
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int __do_strnlen_user(const char *str, unsigned long n,
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void **fault_addr, void **fault_catcher)
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{
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struct tt_regs save = TASK_REGS(get_current())->tt;
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int ret;
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unsigned long *faddrp = (unsigned long *)fault_addr;
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sigjmp_buf jbuf;
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*fault_catcher = &jbuf;
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if(sigsetjmp(jbuf, 1) == 0)
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ret = strlen(str) + 1;
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else ret = *faddrp - (unsigned long) str;
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*fault_addr = NULL;
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*fault_catcher = NULL;
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TASK_REGS(get_current())->tt = save;
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return ret;
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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