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1275 |
phoenix |
#ifndef __PARISC_UACCESS_H
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#define __PARISC_UACCESS_H
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/*
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* User space memory access functions
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*/
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#include <linux/sched.h>
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#include <asm/page.h>
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#include <asm/system.h>
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#include <asm/cache.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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#define KERNEL_DS ((mm_segment_t){0})
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#define USER_DS ((mm_segment_t){1})
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#define segment_eq(a,b) ((a).seg == (b).seg)
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#define get_ds() (KERNEL_DS)
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#define get_fs() (current->addr_limit)
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#define set_fs(x) (current->addr_limit = (x))
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/*
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* Note that since kernel addresses are in a separate address space on
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* parisc, we don't need to do anything for access_ok() or verify_area().
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* We just let the page fault handler do the right thing. This also means
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* that put_user is the same as __put_user, etc.
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*/
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#define access_ok(type,addr,size) (1)
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#define verify_area(type,addr,size) (0)
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#define put_user __put_user
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#define get_user __get_user
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#if BITS_PER_LONG == 32
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#define LDD_KERNEL(ptr) BUG()
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#define LDD_USER(ptr) BUG()
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#define STD_KERNEL(x, ptr) __put_kernel_asm64(x,ptr)
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#define STD_USER(x, ptr) __put_user_asm64(x,ptr)
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#else
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#define LDD_KERNEL(ptr) __get_kernel_asm("ldd",ptr)
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#define LDD_USER(ptr) __get_user_asm("ldd",ptr)
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#define STD_KERNEL(x, ptr) __put_kernel_asm("std",x,ptr)
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#define STD_USER(x, ptr) __put_user_asm("std",x,ptr)
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#endif
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/*
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* The exception table contains two values: the first is an address
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* for an instruction that is allowed to fault, and the second is
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* the number of bytes to skip if a fault occurs. We also support in
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* two bit flags: 0x2 tells the exception handler to clear register
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* r9 and 0x1 tells the exception handler to put -EFAULT in r8.
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* This allows us to handle the simple cases for put_user and
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* get_user without having to have .fixup sections.
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*/
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struct exception_table_entry {
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unsigned long addr; /* address of insn that is allowed to fault. */
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long skip; /* pcoq skip | r9 clear flag | r8 -EFAULT flag */
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};
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extern const struct exception_table_entry
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*search_exception_table(unsigned long addr);
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#define __get_user(x,ptr) \
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({ \
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register long __gu_err __asm__ ("r8") = 0; \
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register long __gu_val __asm__ ("r9") = 0; \
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\
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if (segment_eq(get_fs(),KERNEL_DS)) { \
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switch (sizeof(*(ptr))) { \
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case 1: __get_kernel_asm("ldb",ptr); break; \
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case 2: __get_kernel_asm("ldh",ptr); break; \
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case 4: __get_kernel_asm("ldw",ptr); break; \
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case 8: LDD_KERNEL(ptr); break; \
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default: BUG(); break; \
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} \
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} \
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else { \
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switch (sizeof(*(ptr))) { \
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case 1: __get_user_asm("ldb",ptr); break; \
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case 2: __get_user_asm("ldh",ptr); break; \
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case 4: __get_user_asm("ldw",ptr); break; \
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case 8: LDD_USER(ptr); break; \
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default: BUG(); break; \
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} \
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} \
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\
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(x) = (__typeof__(*(ptr))) __gu_val; \
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__gu_err; \
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})
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#ifdef __LP64__
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#define __get_kernel_asm(ldx,ptr) \
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__asm__("\n1:\t" ldx "\t0(%2),%0\n" \
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"2:\n" \
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"\t.section __ex_table,\"a\"\n" \
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"\t.dword\t1b\n" \
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"\t.dword\t(2b-1b)+3\n" \
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"\t.previous" \
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: "=r"(__gu_val), "=r"(__gu_err) \
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: "r"(ptr), "1"(__gu_err));
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#define __get_user_asm(ldx,ptr) \
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__asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n" \
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"2:\n" \
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"\t.section __ex_table,\"a\"\n" \
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"\t.dword\t1b\n" \
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"\t.dword\t(2b-1b)+3\n" \
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"\t.previous" \
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: "=r"(__gu_val), "=r"(__gu_err) \
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: "r"(ptr), "1"(__gu_err));
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#else
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#define __get_kernel_asm(ldx,ptr) \
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__asm__("\n1:\t" ldx "\t0(%2),%0\n" \
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"2:\n" \
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"\t.section __ex_table,\"a\"\n" \
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"\t.word\t1b\n" \
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"\t.word\t(2b-1b)+3\n" \
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"\t.previous" \
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: "=r"(__gu_val), "=r"(__gu_err) \
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: "r"(ptr), "1"(__gu_err));
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#define __get_user_asm(ldx,ptr) \
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__asm__("\n1:\t" ldx "\t0(%%sr3,%2),%0\n" \
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"2:\n" \
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"\t.section __ex_table,\"a\"\n" \
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"\t.word\t1b\n" \
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"\t.word\t(2b-1b)+3\n" \
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"\t.previous" \
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: "=r"(__gu_val), "=r"(__gu_err) \
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: "r"(ptr), "1"(__gu_err));
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#endif
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#define __put_user(x,ptr) \
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({ \
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register long __pu_err __asm__ ("r8") = 0; \
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\
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if (segment_eq(get_fs(),KERNEL_DS)) { \
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switch (sizeof(*(ptr))) { \
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case 1: __put_kernel_asm("stb",x,ptr); break; \
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case 2: __put_kernel_asm("sth",x,ptr); break; \
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case 4: __put_kernel_asm("stw",x,ptr); break; \
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case 8: STD_KERNEL(x,ptr); break; \
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default: BUG(); break; \
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} \
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} \
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else { \
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switch (sizeof(*(ptr))) { \
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case 1: __put_user_asm("stb",x,ptr); break; \
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case 2: __put_user_asm("sth",x,ptr); break; \
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case 4: __put_user_asm("stw",x,ptr); break; \
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case 8: STD_USER(x,ptr); break; \
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default: BUG(); break; \
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} \
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} \
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\
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__pu_err; \
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})
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/*
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* The "__put_user/kernel_asm()" macros tell gcc they read from memory
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* instead of writing. This is because they do not write to any memory
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* gcc knows about, so there are no aliasing issues.
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*/
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#ifdef __LP64__
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#define __put_kernel_asm(stx,x,ptr) \
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__asm__ __volatile__ ( \
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"\n1:\t" stx "\t%2,0(%1)\n" \
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"2:\n" \
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"\t.section __ex_table,\"a\"\n" \
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"\t.dword\t1b\n" \
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"\t.dword\t(2b-1b)+1\n" \
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"\t.previous" \
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: "=r"(__pu_err) \
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: "r"(ptr), "r"(x), "0"(__pu_err))
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#define __put_user_asm(stx,x,ptr) \
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__asm__ __volatile__ ( \
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"\n1:\t" stx "\t%2,0(%%sr3,%1)\n" \
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"2:\n" \
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"\t.section __ex_table,\"a\"\n" \
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"\t.dword\t1b\n" \
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"\t.dword\t(2b-1b)+1\n" \
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"\t.previous" \
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: "=r"(__pu_err) \
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: "r"(ptr), "r"(x), "0"(__pu_err))
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#else
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#define __put_kernel_asm(stx,x,ptr) \
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__asm__ __volatile__ ( \
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"\n1:\t" stx "\t%2,0(%1)\n" \
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"2:\n" \
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"\t.section __ex_table,\"a\"\n" \
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"\t.word\t1b\n" \
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"\t.word\t(2b-1b)+1\n" \
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"\t.previous" \
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: "=r"(__pu_err) \
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: "r"(ptr), "r"(x), "0"(__pu_err))
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#define __put_user_asm(stx,x,ptr) \
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__asm__ __volatile__ ( \
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"\n1:\t" stx "\t%2,0(%%sr3,%1)\n" \
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"2:\n" \
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"\t.section __ex_table,\"a\"\n" \
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"\t.word\t1b\n" \
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"\t.word\t(2b-1b)+1\n" \
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"\t.previous" \
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: "=r"(__pu_err) \
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: "r"(ptr), "r"(x), "0"(__pu_err))
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static inline void __put_kernel_asm64(u64 x, void *ptr)
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{
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u32 hi = x>>32;
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u32 lo = x&0xffffffff;
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__asm__ __volatile__ (
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"\n1:\tstw %1,0(%0)\n"
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"\n2:\tstw %2,4(%0)\n"
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"3:\n"
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"\t.section __ex_table,\"a\"\n"
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"\t.word\t1b\n"
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"\t.word\t(3b-1b)+1\n"
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"\t.word\t2b\n"
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"\t.word\t(3b-2b)+1\n"
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"\t.previous"
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: : "r"(ptr), "r"(hi), "r"(lo));
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}
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static inline void __put_user_asm64(u64 x, void *ptr)
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{
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u32 hi = x>>32;
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u32 lo = x&0xffffffff;
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__asm__ __volatile__ (
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"\n1:\tstw %1,0(%%sr3,%0)\n"
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"\n2:\tstw %2,4(%%sr3,%0)\n"
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"3:\n"
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"\t.section __ex_table,\"a\"\n"
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"\t.word\t1b\n"
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"\t.word\t(3b-1b)+1\n"
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"\t.word\t2b\n"
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"\t.word\t(3b-2b)+1\n"
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"\t.previous"
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: : "r"(ptr), "r"(hi), "r"(lo));
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}
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#endif
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/*
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* Complex access routines -- external declarations
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*/
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extern unsigned long lcopy_to_user(void *, const void *, unsigned long);
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extern unsigned long lcopy_from_user(void *, const void *, unsigned long);
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extern long lstrncpy_from_user(char *, const char *, long);
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extern unsigned lclear_user(void *,unsigned long);
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extern long lstrnlen_user(const char *,long);
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/*
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* Complex access routines -- macros
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*/
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#define strncpy_from_user lstrncpy_from_user
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#define strnlen_user lstrnlen_user
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#define strlen_user(str) lstrnlen_user(str, 0x7fffffffL)
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#define clear_user lclear_user
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#define __clear_user lclear_user
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#define copy_from_user lcopy_from_user
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#define __copy_from_user lcopy_from_user
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#define copy_to_user lcopy_to_user
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#define __copy_to_user lcopy_to_user
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#endif /* __PARISC_UACCESS_H */
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