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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-sparc64/uaccess.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-sparc64/uaccess.h')
-rw-r--r--include/asm-sparc64/uaccess.h335
1 files changed, 335 insertions, 0 deletions
diff --git a/include/asm-sparc64/uaccess.h b/include/asm-sparc64/uaccess.h
new file mode 100644
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+++ b/include/asm-sparc64/uaccess.h
@@ -0,0 +1,335 @@
+/* $Id: uaccess.h,v 1.35 2002/02/09 19:49:31 davem Exp $ */
+#ifndef _ASM_UACCESS_H
+#define _ASM_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+
+#ifdef __KERNEL__
+#include <linux/compiler.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <asm/a.out.h>
+#include <asm/asi.h>
+#include <asm/system.h>
+#include <asm/spitfire.h>
+#include <asm-generic/uaccess.h>
+#endif
+
+#ifndef __ASSEMBLY__
+
+/*
+ * Sparc64 is segmented, though more like the M68K than the I386.
+ * We use the secondary ASI to address user memory, which references a
+ * completely different VM map, thus there is zero chance of the user
+ * doing something queer and tricking us into poking kernel memory.
+ *
+ * What is left here is basically what is needed for the other parts of
+ * the kernel that expect to be able to manipulate, erum, "segments".
+ * Or perhaps more properly, permissions.
+ *
+ * "For historical reasons, these macros are grossly misnamed." -Linus
+ */
+
+#define KERNEL_DS ((mm_segment_t) { ASI_P })
+#define USER_DS ((mm_segment_t) { ASI_AIUS }) /* har har har */
+
+#define VERIFY_READ 0
+#define VERIFY_WRITE 1
+
+#define get_fs() ((mm_segment_t) { get_thread_current_ds() })
+#define get_ds() (KERNEL_DS)
+
+#define segment_eq(a,b) ((a).seg == (b).seg)
+
+#define set_fs(val) \
+do { \
+ set_thread_current_ds((val).seg); \
+ __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg)); \
+} while(0)
+
+static inline int __access_ok(const void __user * addr, unsigned long size)
+{
+ return 1;
+}
+
+static inline int access_ok(int type, const void __user * addr, unsigned long size)
+{
+ return 1;
+}
+
+/* this function will go away soon - use access_ok() instead */
+static inline int __deprecated verify_area(int type, const void __user * addr, unsigned long size)
+{
+ return 0;
+}
+
+/*
+ * The exception table consists of pairs of addresses: the first is the
+ * address of an instruction that is allowed to fault, and the second is
+ * the address at which the program should continue. No registers are
+ * modified, so it is entirely up to the continuation code to figure out
+ * what to do.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path. This means when everything is well,
+ * we don't even have to jump over them. Further, they do not intrude
+ * on our cache or tlb entries.
+ *
+ * There is a special way how to put a range of potentially faulting
+ * insns (like twenty ldd/std's with now intervening other instructions)
+ * You specify address of first in insn and 0 in fixup and in the next
+ * exception_table_entry you specify last potentially faulting insn + 1
+ * and in fixup the routine which should handle the fault.
+ * That fixup code will get
+ * (faulting_insn_address - first_insn_in_the_range_address)/4
+ * in %g2 (ie. index of the faulting instruction in the range).
+ */
+
+struct exception_table_entry
+{
+ unsigned insn, fixup;
+};
+
+/* Special exable search, which handles ranges. Returns fixup */
+unsigned long search_extables_range(unsigned long addr, unsigned long *g2);
+
+extern void __ret_efault(void);
+
+/* Uh, these should become the main single-value transfer routines..
+ * They automatically use the right size if we just have the right
+ * pointer type..
+ *
+ * This gets kind of ugly. We want to return _two_ values in "get_user()"
+ * and yet we don't want to do any pointers, because that is too much
+ * of a performance impact. Thus we have a few rather ugly macros here,
+ * and hide all the ugliness from the user.
+ */
+#define put_user(x,ptr) ({ \
+unsigned long __pu_addr = (unsigned long)(ptr); \
+__chk_user_ptr(ptr); \
+__put_user_nocheck((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr))); })
+
+#define get_user(x,ptr) ({ \
+unsigned long __gu_addr = (unsigned long)(ptr); \
+__chk_user_ptr(ptr); \
+__get_user_nocheck((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); })
+
+#define __put_user(x,ptr) put_user(x,ptr)
+#define __get_user(x,ptr) get_user(x,ptr)
+
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) ((struct __large_struct *)(x))
+
+#define __put_user_nocheck(data,addr,size) ({ \
+register int __pu_ret; \
+switch (size) { \
+case 1: __put_user_asm(data,b,addr,__pu_ret); break; \
+case 2: __put_user_asm(data,h,addr,__pu_ret); break; \
+case 4: __put_user_asm(data,w,addr,__pu_ret); break; \
+case 8: __put_user_asm(data,x,addr,__pu_ret); break; \
+default: __pu_ret = __put_user_bad(); break; \
+} __pu_ret; })
+
+#define __put_user_nocheck_ret(data,addr,size,retval) ({ \
+register int __foo __asm__ ("l1"); \
+switch (size) { \
+case 1: __put_user_asm_ret(data,b,addr,retval,__foo); break; \
+case 2: __put_user_asm_ret(data,h,addr,retval,__foo); break; \
+case 4: __put_user_asm_ret(data,w,addr,retval,__foo); break; \
+case 8: __put_user_asm_ret(data,x,addr,retval,__foo); break; \
+default: if (__put_user_bad()) return retval; break; \
+} })
+
+#define __put_user_asm(x,size,addr,ret) \
+__asm__ __volatile__( \
+ "/* Put user asm, inline. */\n" \
+"1:\t" "st"#size "a %1, [%2] %%asi\n\t" \
+ "clr %0\n" \
+"2:\n\n\t" \
+ ".section .fixup,#alloc,#execinstr\n\t" \
+ ".align 4\n" \
+"3:\n\t" \
+ "b 2b\n\t" \
+ " mov %3, %0\n\n\t" \
+ ".previous\n\t" \
+ ".section __ex_table,#alloc\n\t" \
+ ".align 4\n\t" \
+ ".word 1b, 3b\n\t" \
+ ".previous\n\n\t" \
+ : "=r" (ret) : "r" (x), "r" (__m(addr)), \
+ "i" (-EFAULT))
+
+#define __put_user_asm_ret(x,size,addr,ret,foo) \
+if (__builtin_constant_p(ret) && ret == -EFAULT) \
+__asm__ __volatile__( \
+ "/* Put user asm ret, inline. */\n" \
+"1:\t" "st"#size "a %1, [%2] %%asi\n\n\t" \
+ ".section __ex_table,#alloc\n\t" \
+ ".align 4\n\t" \
+ ".word 1b, __ret_efault\n\n\t" \
+ ".previous\n\n\t" \
+ : "=r" (foo) : "r" (x), "r" (__m(addr))); \
+else \
+__asm__ __volatile__( \
+ "/* Put user asm ret, inline. */\n" \
+"1:\t" "st"#size "a %1, [%2] %%asi\n\n\t" \
+ ".section .fixup,#alloc,#execinstr\n\t" \
+ ".align 4\n" \
+"3:\n\t" \
+ "ret\n\t" \
+ " restore %%g0, %3, %%o0\n\n\t" \
+ ".previous\n\t" \
+ ".section __ex_table,#alloc\n\t" \
+ ".align 4\n\t" \
+ ".word 1b, 3b\n\n\t" \
+ ".previous\n\n\t" \
+ : "=r" (foo) : "r" (x), "r" (__m(addr)), \
+ "i" (ret))
+
+extern int __put_user_bad(void);
+
+#define __get_user_nocheck(data,addr,size,type) ({ \
+register int __gu_ret; \
+register unsigned long __gu_val; \
+switch (size) { \
+case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \
+case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \
+case 4: __get_user_asm(__gu_val,uw,addr,__gu_ret); break; \
+case 8: __get_user_asm(__gu_val,x,addr,__gu_ret); break; \
+default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \
+} data = (type) __gu_val; __gu_ret; })
+
+#define __get_user_nocheck_ret(data,addr,size,type,retval) ({ \
+register unsigned long __gu_val __asm__ ("l1"); \
+switch (size) { \
+case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \
+case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
+case 4: __get_user_asm_ret(__gu_val,uw,addr,retval); break; \
+case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \
+default: if (__get_user_bad()) return retval; \
+} data = (type) __gu_val; })
+
+#define __get_user_asm(x,size,addr,ret) \
+__asm__ __volatile__( \
+ "/* Get user asm, inline. */\n" \
+"1:\t" "ld"#size "a [%2] %%asi, %1\n\t" \
+ "clr %0\n" \
+"2:\n\n\t" \
+ ".section .fixup,#alloc,#execinstr\n\t" \
+ ".align 4\n" \
+"3:\n\t" \
+ "clr %1\n\t" \
+ "b 2b\n\t" \
+ " mov %3, %0\n\n\t" \
+ ".previous\n\t" \
+ ".section __ex_table,#alloc\n\t" \
+ ".align 4\n\t" \
+ ".word 1b, 3b\n\n\t" \
+ ".previous\n\t" \
+ : "=r" (ret), "=r" (x) : "r" (__m(addr)), \
+ "i" (-EFAULT))
+
+#define __get_user_asm_ret(x,size,addr,retval) \
+if (__builtin_constant_p(retval) && retval == -EFAULT) \
+__asm__ __volatile__( \
+ "/* Get user asm ret, inline. */\n" \
+"1:\t" "ld"#size "a [%1] %%asi, %0\n\n\t" \
+ ".section __ex_table,#alloc\n\t" \
+ ".align 4\n\t" \
+ ".word 1b,__ret_efault\n\n\t" \
+ ".previous\n\t" \
+ : "=r" (x) : "r" (__m(addr))); \
+else \
+__asm__ __volatile__( \
+ "/* Get user asm ret, inline. */\n" \
+"1:\t" "ld"#size "a [%1] %%asi, %0\n\n\t" \
+ ".section .fixup,#alloc,#execinstr\n\t" \
+ ".align 4\n" \
+"3:\n\t" \
+ "ret\n\t" \
+ " restore %%g0, %2, %%o0\n\n\t" \
+ ".previous\n\t" \
+ ".section __ex_table,#alloc\n\t" \
+ ".align 4\n\t" \
+ ".word 1b, 3b\n\n\t" \
+ ".previous\n\t" \
+ : "=r" (x) : "r" (__m(addr)), "i" (retval))
+
+extern int __get_user_bad(void);
+
+extern unsigned long __must_check ___copy_from_user(void *to,
+ const void __user *from,
+ unsigned long size);
+extern unsigned long copy_from_user_fixup(void *to, const void __user *from,
+ unsigned long size);
+static inline unsigned long __must_check
+copy_from_user(void *to, const void __user *from, unsigned long size)
+{
+ unsigned long ret = ___copy_from_user(to, from, size);
+
+ if (ret)
+ ret = copy_from_user_fixup(to, from, size);
+ return ret;
+}
+#define __copy_from_user copy_from_user
+
+extern unsigned long __must_check ___copy_to_user(void __user *to,
+ const void *from,
+ unsigned long size);
+extern unsigned long copy_to_user_fixup(void __user *to, const void *from,
+ unsigned long size);
+static inline unsigned long __must_check
+copy_to_user(void __user *to, const void *from, unsigned long size)
+{
+ unsigned long ret = ___copy_to_user(to, from, size);
+
+ if (ret)
+ ret = copy_to_user_fixup(to, from, size);
+ return ret;
+}
+#define __copy_to_user copy_to_user
+
+extern unsigned long __must_check ___copy_in_user(void __user *to,
+ const void __user *from,
+ unsigned long size);
+extern unsigned long copy_in_user_fixup(void __user *to, void __user *from,
+ unsigned long size);
+static inline unsigned long __must_check
+copy_in_user(void __user *to, void __user *from, unsigned long size)
+{
+ unsigned long ret = ___copy_in_user(to, from, size);
+
+ if (ret)
+ ret = copy_in_user_fixup(to, from, size);
+ return ret;
+}
+#define __copy_in_user copy_in_user
+
+extern unsigned long __must_check __bzero_noasi(void __user *, unsigned long);
+
+static inline unsigned long __must_check
+__clear_user(void __user *addr, unsigned long size)
+{
+
+ return __bzero_noasi(addr, size);
+}
+
+#define clear_user __clear_user
+
+extern long __must_check __strncpy_from_user(char *dest, const char __user *src, long count);
+
+#define strncpy_from_user __strncpy_from_user
+
+extern long __strlen_user(const char __user *);
+extern long __strnlen_user(const char __user *, long len);
+
+#define strlen_user __strlen_user
+#define strnlen_user __strnlen_user
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_UACCESS_H */