07f2402b4a
Function __copy_user_zeroing in arch/lib/usercopy.c had the wrong parameter set as __user, and in include/asm-cris/uaccess.h, it was not set at all for some of the calling functions. This will cut the number of warnings quite dramatically when using sparse. While we're here, remove useless CVS log and correct confusing typo. Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Mikael Starvik <mikael.starvik@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
523 lines
16 KiB
C
523 lines
16 KiB
C
/*
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* User address space access functions.
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* The non-inlined parts of asm-cris/uaccess.h are here.
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*
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* Copyright (C) 2000, Axis Communications AB.
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*
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* Written by Hans-Peter Nilsson.
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* Pieces used from memcpy, originally by Kenny Ranerup long time ago.
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*/
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#include <asm/uaccess.h>
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/* Asm:s have been tweaked (within the domain of correctness) to give
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satisfactory results for "gcc version 2.96 20000427 (experimental)".
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Check regularly...
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Note that the PC saved at a bus-fault is the address *after* the
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faulting instruction, which means the branch-target for instructions in
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delay-slots for taken branches. Note also that the postincrement in
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the instruction is performed regardless of bus-fault; the register is
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seen updated in fault handlers.
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Oh, and on the code formatting issue, to whomever feels like "fixing
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it" to Conformity: I'm too "lazy", but why don't you go ahead and "fix"
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string.c too. I just don't think too many people will hack this file
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for the code format to be an issue. */
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/* Copy to userspace. This is based on the memcpy used for
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kernel-to-kernel copying; see "string.c". */
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unsigned long
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__copy_user (void __user *pdst, const void *psrc, unsigned long pn)
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{
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/* We want the parameters put in special registers.
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Make sure the compiler is able to make something useful of this.
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As it is now: r10 -> r13; r11 -> r11 (nop); r12 -> r12 (nop).
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FIXME: Comment for old gcc version. Check.
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If gcc was alright, it really would need no temporaries, and no
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stack space to save stuff on. */
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register char *dst __asm__ ("r13") = pdst;
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register const char *src __asm__ ("r11") = psrc;
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register int n __asm__ ("r12") = pn;
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register int retn __asm__ ("r10") = 0;
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/* When src is aligned but not dst, this makes a few extra needless
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cycles. I believe it would take as many to check that the
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re-alignment was unnecessary. */
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if (((unsigned long) dst & 3) != 0
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/* Don't align if we wouldn't copy more than a few bytes; so we
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don't have to check further for overflows. */
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&& n >= 3)
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{
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if ((unsigned long) dst & 1)
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{
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__asm_copy_to_user_1 (dst, src, retn);
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n--;
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}
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if ((unsigned long) dst & 2)
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{
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__asm_copy_to_user_2 (dst, src, retn);
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n -= 2;
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}
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}
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/* Decide which copying method to use. */
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if (n >= 44*2) /* Break even between movem and
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move16 is at 38.7*2, but modulo 44. */
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{
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/* For large copies we use 'movem'. */
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/* It is not optimal to tell the compiler about clobbering any
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registers; that will move the saving/restoring of those registers
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to the function prologue/epilogue, and make non-movem sizes
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suboptimal.
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This method is not foolproof; it assumes that the "asm reg"
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declarations at the beginning of the function really are used
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here (beware: they may be moved to temporary registers).
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This way, we do not have to save/move the registers around into
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temporaries; we can safely use them straight away.
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If you want to check that the allocation was right; then
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check the equalities in the first comment. It should say
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"r13=r13, r11=r11, r12=r12". */
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__asm__ volatile ("\
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.ifnc %0%1%2%3,$r13$r11$r12$r10 \n\
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.err \n\
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.endif \n\
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\n\
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;; Save the registers we'll use in the movem process \n\
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;; on the stack. \n\
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subq 11*4,$sp \n\
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movem $r10,[$sp] \n\
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\n\
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;; Now we've got this: \n\
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;; r11 - src \n\
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;; r13 - dst \n\
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;; r12 - n \n\
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\n\
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;; Update n for the first loop \n\
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subq 44,$r12 \n\
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\n\
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; Since the noted PC of a faulting instruction in a delay-slot of a taken \n\
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; branch, is that of the branch target, we actually point at the from-movem \n\
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; for this case. There is no ambiguity here; if there was a fault in that \n\
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; instruction (meaning a kernel oops), the faulted PC would be the address \n\
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; after *that* movem. \n\
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\n\
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0: \n\
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movem [$r11+],$r10 \n\
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subq 44,$r12 \n\
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bge 0b \n\
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movem $r10,[$r13+] \n\
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1: \n\
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addq 44,$r12 ;; compensate for last loop underflowing n \n\
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\n\
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;; Restore registers from stack \n\
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movem [$sp+],$r10 \n\
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2: \n\
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.section .fixup,\"ax\" \n\
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\n\
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; To provide a correct count in r10 of bytes that failed to be copied, \n\
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; we jump back into the loop if the loop-branch was taken. There is no \n\
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; performance penalty for sany use; the program will segfault soon enough.\n\
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\n\
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3: \n\
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move.d [$sp],$r10 \n\
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addq 44,$r10 \n\
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move.d $r10,[$sp] \n\
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jump 0b \n\
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4: \n\
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movem [$sp+],$r10 \n\
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addq 44,$r10 \n\
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addq 44,$r12 \n\
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jump 2b \n\
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\n\
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.previous \n\
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.section __ex_table,\"a\" \n\
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.dword 0b,3b \n\
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.dword 1b,4b \n\
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.previous"
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/* Outputs */ : "=r" (dst), "=r" (src), "=r" (n), "=r" (retn)
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/* Inputs */ : "0" (dst), "1" (src), "2" (n), "3" (retn));
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}
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/* Either we directly start copying, using dword copying in a loop, or
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we copy as much as possible with 'movem' and then the last block (<44
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bytes) is copied here. This will work since 'movem' will have
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updated SRC, DST and N. */
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while (n >= 16)
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{
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__asm_copy_to_user_16 (dst, src, retn);
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n -= 16;
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}
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/* Having a separate by-four loops cuts down on cache footprint.
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FIXME: Test with and without; increasing switch to be 0..15. */
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while (n >= 4)
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{
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__asm_copy_to_user_4 (dst, src, retn);
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n -= 4;
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}
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switch (n)
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{
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case 0:
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break;
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case 1:
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__asm_copy_to_user_1 (dst, src, retn);
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break;
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case 2:
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__asm_copy_to_user_2 (dst, src, retn);
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break;
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case 3:
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__asm_copy_to_user_3 (dst, src, retn);
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break;
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}
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return retn;
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}
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/* Copy from user to kernel, zeroing the bytes that were inaccessible in
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userland. The return-value is the number of bytes that were
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inaccessible. */
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unsigned long
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__copy_user_zeroing(void *pdst, const void __user *psrc, unsigned long pn)
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{
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/* We want the parameters put in special registers.
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Make sure the compiler is able to make something useful of this.
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As it is now: r10 -> r13; r11 -> r11 (nop); r12 -> r12 (nop).
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FIXME: Comment for old gcc version. Check.
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If gcc was alright, it really would need no temporaries, and no
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stack space to save stuff on. */
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register char *dst __asm__ ("r13") = pdst;
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register const char *src __asm__ ("r11") = psrc;
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register int n __asm__ ("r12") = pn;
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register int retn __asm__ ("r10") = 0;
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/* The best reason to align src is that we then know that a read-fault
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was for aligned bytes; there's no 1..3 remaining good bytes to
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pickle. */
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if (((unsigned long) src & 3) != 0)
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{
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if (((unsigned long) src & 1) && n != 0)
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{
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__asm_copy_from_user_1 (dst, src, retn);
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n--;
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}
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if (((unsigned long) src & 2) && n >= 2)
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{
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__asm_copy_from_user_2 (dst, src, retn);
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n -= 2;
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}
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/* We only need one check after the unalignment-adjustments, because
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if both adjustments were done, either both or neither reference
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had an exception. */
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if (retn != 0)
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goto copy_exception_bytes;
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}
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/* Decide which copying method to use. */
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if (n >= 44*2) /* Break even between movem and
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move16 is at 38.7*2, but modulo 44.
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FIXME: We use move4 now. */
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{
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/* For large copies we use 'movem' */
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/* It is not optimal to tell the compiler about clobbering any
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registers; that will move the saving/restoring of those registers
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to the function prologue/epilogue, and make non-movem sizes
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suboptimal.
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This method is not foolproof; it assumes that the "asm reg"
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declarations at the beginning of the function really are used
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here (beware: they may be moved to temporary registers).
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This way, we do not have to save/move the registers around into
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temporaries; we can safely use them straight away.
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If you want to check that the allocation was right; then
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check the equalities in the first comment. It should say
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"r13=r13, r11=r11, r12=r12" */
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__asm__ volatile ("\n\
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.ifnc %0%1%2%3,$r13$r11$r12$r10 \n\
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.err \n\
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.endif \n\
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\n\
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;; Save the registers we'll use in the movem process \n\
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;; on the stack. \n\
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subq 11*4,$sp \n\
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movem $r10,[$sp] \n\
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\n\
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;; Now we've got this: \n\
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;; r11 - src \n\
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;; r13 - dst \n\
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;; r12 - n \n\
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\n\
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;; Update n for the first loop \n\
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subq 44,$r12 \n\
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0: \n\
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movem [$r11+],$r10 \n\
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1: \n\
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subq 44,$r12 \n\
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bge 0b \n\
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movem $r10,[$r13+] \n\
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\n\
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addq 44,$r12 ;; compensate for last loop underflowing n \n\
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\n\
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;; Restore registers from stack \n\
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movem [$sp+],$r10 \n\
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4: \n\
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.section .fixup,\"ax\" \n\
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\n\
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;; Do not jump back into the loop if we fail. For some uses, we get a \n\
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;; page fault somewhere on the line. Without checking for page limits, \n\
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;; we don't know where, but we need to copy accurately and keep an \n\
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;; accurate count; not just clear the whole line. To do that, we fall \n\
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;; down in the code below, proceeding with smaller amounts. It should \n\
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;; be kept in mind that we have to cater to code like what at one time \n\
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;; was in fs/super.c: \n\
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;; i = size - copy_from_user((void *)page, data, size); \n\
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;; which would cause repeated faults while clearing the remainder of \n\
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;; the SIZE bytes at PAGE after the first fault. \n\
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;; A caveat here is that we must not fall through from a failing page \n\
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;; to a valid page. \n\
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\n\
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3: \n\
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movem [$sp+],$r10 \n\
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addq 44,$r12 ;; Get back count before faulting point. \n\
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subq 44,$r11 ;; Get back pointer to faulting movem-line. \n\
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jump 4b ;; Fall through, pretending the fault didn't happen.\n\
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\n\
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.previous \n\
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.section __ex_table,\"a\" \n\
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.dword 1b,3b \n\
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.previous"
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/* Outputs */ : "=r" (dst), "=r" (src), "=r" (n), "=r" (retn)
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/* Inputs */ : "0" (dst), "1" (src), "2" (n), "3" (retn));
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}
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/* Either we directly start copying here, using dword copying in a loop,
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or we copy as much as possible with 'movem' and then the last block
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(<44 bytes) is copied here. This will work since 'movem' will have
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updated src, dst and n. (Except with failing src.)
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Since we want to keep src accurate, we can't use
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__asm_copy_from_user_N with N != (1, 2, 4); it updates dst and
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retn, but not src (by design; it's value is ignored elsewhere). */
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while (n >= 4)
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{
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__asm_copy_from_user_4 (dst, src, retn);
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n -= 4;
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if (retn)
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goto copy_exception_bytes;
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}
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/* If we get here, there were no memory read faults. */
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switch (n)
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{
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/* These copies are at least "naturally aligned" (so we don't have
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to check each byte), due to the src alignment code before the
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movem loop. The *_3 case *will* get the correct count for retn. */
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case 0:
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/* This case deliberately left in (if you have doubts check the
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generated assembly code). */
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break;
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case 1:
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__asm_copy_from_user_1 (dst, src, retn);
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break;
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case 2:
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__asm_copy_from_user_2 (dst, src, retn);
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break;
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case 3:
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__asm_copy_from_user_3 (dst, src, retn);
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break;
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}
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/* If we get here, retn correctly reflects the number of failing
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bytes. */
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return retn;
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copy_exception_bytes:
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/* We already have "retn" bytes cleared, and need to clear the
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remaining "n" bytes. A non-optimized simple byte-for-byte in-line
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memset is preferred here, since this isn't speed-critical code and
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we'd rather have this a leaf-function than calling memset. */
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{
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char *endp;
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for (endp = dst + n; dst < endp; dst++)
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*dst = 0;
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}
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return retn + n;
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}
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/* Zero userspace. */
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unsigned long
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__do_clear_user (void __user *pto, unsigned long pn)
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{
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/* We want the parameters put in special registers.
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Make sure the compiler is able to make something useful of this.
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As it is now: r10 -> r13; r11 -> r11 (nop); r12 -> r12 (nop).
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FIXME: Comment for old gcc version. Check.
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If gcc was alright, it really would need no temporaries, and no
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stack space to save stuff on. */
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register char *dst __asm__ ("r13") = pto;
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register int n __asm__ ("r12") = pn;
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register int retn __asm__ ("r10") = 0;
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if (((unsigned long) dst & 3) != 0
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/* Don't align if we wouldn't copy more than a few bytes. */
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&& n >= 3)
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{
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if ((unsigned long) dst & 1)
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{
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__asm_clear_1 (dst, retn);
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n--;
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}
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if ((unsigned long) dst & 2)
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{
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__asm_clear_2 (dst, retn);
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n -= 2;
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}
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}
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/* Decide which copying method to use.
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FIXME: This number is from the "ordinary" kernel memset. */
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if (n >= (1*48))
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{
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/* For large clears we use 'movem' */
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/* It is not optimal to tell the compiler about clobbering any
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call-saved registers; that will move the saving/restoring of
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those registers to the function prologue/epilogue, and make
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|
non-movem sizes suboptimal.
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|
|
|
This method is not foolproof; it assumes that the "asm reg"
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|
declarations at the beginning of the function really are used
|
|
here (beware: they may be moved to temporary registers).
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|
This way, we do not have to save/move the registers around into
|
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temporaries; we can safely use them straight away.
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|
|
|
If you want to check that the allocation was right; then
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|
check the equalities in the first comment. It should say
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|
something like "r13=r13, r11=r11, r12=r12". */
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__asm__ volatile ("\n\
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.ifnc %0%1%2,$r13$r12$r10 \n\
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.err \n\
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.endif \n\
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\n\
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;; Save the registers we'll clobber in the movem process \n\
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;; on the stack. Don't mention them to gcc, it will only be \n\
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;; upset. \n\
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subq 11*4,$sp \n\
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movem $r10,[$sp] \n\
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\n\
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clear.d $r0 \n\
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clear.d $r1 \n\
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clear.d $r2 \n\
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clear.d $r3 \n\
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clear.d $r4 \n\
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clear.d $r5 \n\
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clear.d $r6 \n\
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clear.d $r7 \n\
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clear.d $r8 \n\
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clear.d $r9 \n\
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clear.d $r10 \n\
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clear.d $r11 \n\
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\n\
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;; Now we've got this: \n\
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;; r13 - dst \n\
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;; r12 - n \n\
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\n\
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;; Update n for the first loop \n\
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subq 12*4,$r12 \n\
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0: \n\
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subq 12*4,$r12 \n\
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bge 0b \n\
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movem $r11,[$r13+] \n\
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1: \n\
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addq 12*4,$r12 ;; compensate for last loop underflowing n\n\
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\n\
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;; Restore registers from stack \n\
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movem [$sp+],$r10 \n\
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2: \n\
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.section .fixup,\"ax\" \n\
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3: \n\
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move.d [$sp],$r10 \n\
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addq 12*4,$r10 \n\
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move.d $r10,[$sp] \n\
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clear.d $r10 \n\
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jump 0b \n\
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\n\
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4: \n\
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movem [$sp+],$r10 \n\
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addq 12*4,$r10 \n\
|
|
addq 12*4,$r12 \n\
|
|
jump 2b \n\
|
|
\n\
|
|
.previous \n\
|
|
.section __ex_table,\"a\" \n\
|
|
.dword 0b,3b \n\
|
|
.dword 1b,4b \n\
|
|
.previous"
|
|
|
|
/* Outputs */ : "=r" (dst), "=r" (n), "=r" (retn)
|
|
/* Inputs */ : "0" (dst), "1" (n), "2" (retn)
|
|
/* Clobber */ : "r11");
|
|
}
|
|
|
|
while (n >= 16)
|
|
{
|
|
__asm_clear_16 (dst, retn);
|
|
n -= 16;
|
|
}
|
|
|
|
/* Having a separate by-four loops cuts down on cache footprint.
|
|
FIXME: Test with and without; increasing switch to be 0..15. */
|
|
while (n >= 4)
|
|
{
|
|
__asm_clear_4 (dst, retn);
|
|
n -= 4;
|
|
}
|
|
|
|
switch (n)
|
|
{
|
|
case 0:
|
|
break;
|
|
case 1:
|
|
__asm_clear_1 (dst, retn);
|
|
break;
|
|
case 2:
|
|
__asm_clear_2 (dst, retn);
|
|
break;
|
|
case 3:
|
|
__asm_clear_3 (dst, retn);
|
|
break;
|
|
}
|
|
|
|
return retn;
|
|
}
|