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96d4f267e4
Nobody has actually used the type (VERIFY_READ vs VERIFY_WRITE) argument
of the user address range verification function since we got rid of the
old racy i386-only code to walk page tables by hand.
It existed because the original 80386 would not honor the write protect
bit when in kernel mode, so you had to do COW by hand before doing any
user access. But we haven't supported that in a long time, and these
days the 'type' argument is a purely historical artifact.
A discussion about extending 'user_access_begin()' to do the range
checking resulted this patch, because there is no way we're going to
move the old VERIFY_xyz interface to that model. And it's best done at
the end of the merge window when I've done most of my merges, so let's
just get this done once and for all.
This patch was mostly done with a sed-script, with manual fix-ups for
the cases that weren't of the trivial 'access_ok(VERIFY_xyz' form.
There were a couple of notable cases:
- csky still had the old "verify_area()" name as an alias.
- the iter_iov code had magical hardcoded knowledge of the actual
values of VERIFY_{READ,WRITE} (not that they mattered, since nothing
really used it)
- microblaze used the type argument for a debug printout
but other than those oddities this should be a total no-op patch.
I tried to fix up all architectures, did fairly extensive grepping for
access_ok() uses, and the changes are trivial, but I may have missed
something. Any missed conversion should be trivially fixable, though.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
251 lines
6.8 KiB
C
251 lines
6.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __SPARC_CHECKSUM_H
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#define __SPARC_CHECKSUM_H
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/* checksum.h: IP/UDP/TCP checksum routines on the Sparc.
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*
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* Copyright(C) 1995 Linus Torvalds
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* Copyright(C) 1995 Miguel de Icaza
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* Copyright(C) 1996 David S. Miller
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* Copyright(C) 1996 Eddie C. Dost
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* Copyright(C) 1997 Jakub Jelinek
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*
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* derived from:
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* Alpha checksum c-code
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* ix86 inline assembly
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* RFC1071 Computing the Internet Checksum
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*/
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#include <linux/in6.h>
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#include <linux/uaccess.h>
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/* computes the checksum of a memory block at buff, length len,
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* and adds in "sum" (32-bit)
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*
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* returns a 32-bit number suitable for feeding into itself
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* or csum_tcpudp_magic
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*
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* this function must be called with even lengths, except
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* for the last fragment, which may be odd
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*
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* it's best to have buff aligned on a 32-bit boundary
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*/
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__wsum csum_partial(const void *buff, int len, __wsum sum);
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/* the same as csum_partial, but copies from fs:src while it
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* checksums
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*
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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*/
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unsigned int __csum_partial_copy_sparc_generic (const unsigned char *, unsigned char *);
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static inline __wsum
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csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
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{
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register unsigned int ret asm("o0") = (unsigned int)src;
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register char *d asm("o1") = dst;
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register int l asm("g1") = len;
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__asm__ __volatile__ (
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"call __csum_partial_copy_sparc_generic\n\t"
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" mov %6, %%g7\n"
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: "=&r" (ret), "=&r" (d), "=&r" (l)
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: "0" (ret), "1" (d), "2" (l), "r" (sum)
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: "o2", "o3", "o4", "o5", "o7",
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"g2", "g3", "g4", "g5", "g7",
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"memory", "cc");
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return (__force __wsum)ret;
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}
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static inline __wsum
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csum_partial_copy_from_user(const void __user *src, void *dst, int len,
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__wsum sum, int *err)
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{
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register unsigned long ret asm("o0") = (unsigned long)src;
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register char *d asm("o1") = dst;
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register int l asm("g1") = len;
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register __wsum s asm("g7") = sum;
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__asm__ __volatile__ (
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".section __ex_table,#alloc\n\t"
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".align 4\n\t"
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".word 1f,2\n\t"
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".previous\n"
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"1:\n\t"
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"call __csum_partial_copy_sparc_generic\n\t"
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" st %8, [%%sp + 64]\n"
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: "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s)
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: "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err)
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: "o2", "o3", "o4", "o5", "o7", "g2", "g3", "g4", "g5",
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"cc", "memory");
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return (__force __wsum)ret;
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}
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static inline __wsum
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csum_partial_copy_to_user(const void *src, void __user *dst, int len,
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__wsum sum, int *err)
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{
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if (!access_ok(dst, len)) {
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*err = -EFAULT;
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return sum;
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} else {
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register unsigned long ret asm("o0") = (unsigned long)src;
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register char __user *d asm("o1") = dst;
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register int l asm("g1") = len;
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register __wsum s asm("g7") = sum;
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__asm__ __volatile__ (
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".section __ex_table,#alloc\n\t"
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".align 4\n\t"
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".word 1f,1\n\t"
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".previous\n"
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"1:\n\t"
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"call __csum_partial_copy_sparc_generic\n\t"
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" st %8, [%%sp + 64]\n"
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: "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s)
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: "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err)
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: "o2", "o3", "o4", "o5", "o7",
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"g2", "g3", "g4", "g5",
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"cc", "memory");
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return (__force __wsum)ret;
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}
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}
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#define HAVE_CSUM_COPY_USER
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#define csum_and_copy_to_user csum_partial_copy_to_user
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/* ihl is always 5 or greater, almost always is 5, and iph is word aligned
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* the majority of the time.
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*/
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
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{
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__sum16 sum;
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/* Note: We must read %2 before we touch %0 for the first time,
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* because GCC can legitimately use the same register for
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* both operands.
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*/
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__asm__ __volatile__("sub\t%2, 4, %%g4\n\t"
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"ld\t[%1 + 0x00], %0\n\t"
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"ld\t[%1 + 0x04], %%g2\n\t"
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"ld\t[%1 + 0x08], %%g3\n\t"
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"addcc\t%%g2, %0, %0\n\t"
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"addxcc\t%%g3, %0, %0\n\t"
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"ld\t[%1 + 0x0c], %%g2\n\t"
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"ld\t[%1 + 0x10], %%g3\n\t"
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"addxcc\t%%g2, %0, %0\n\t"
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"addx\t%0, %%g0, %0\n"
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"1:\taddcc\t%%g3, %0, %0\n\t"
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"add\t%1, 4, %1\n\t"
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"addxcc\t%0, %%g0, %0\n\t"
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"subcc\t%%g4, 1, %%g4\n\t"
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"be,a\t2f\n\t"
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"sll\t%0, 16, %%g2\n\t"
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"b\t1b\n\t"
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"ld\t[%1 + 0x10], %%g3\n"
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"2:\taddcc\t%0, %%g2, %%g2\n\t"
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"srl\t%%g2, 16, %0\n\t"
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"addx\t%0, %%g0, %0\n\t"
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"xnor\t%%g0, %0, %0"
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: "=r" (sum), "=&r" (iph)
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: "r" (ihl), "1" (iph)
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: "g2", "g3", "g4", "cc", "memory");
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return sum;
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}
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/* Fold a partial checksum without adding pseudo headers. */
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static inline __sum16 csum_fold(__wsum sum)
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{
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unsigned int tmp;
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__asm__ __volatile__("addcc\t%0, %1, %1\n\t"
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"srl\t%1, 16, %1\n\t"
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"addx\t%1, %%g0, %1\n\t"
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"xnor\t%%g0, %1, %0"
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: "=&r" (sum), "=r" (tmp)
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: "0" (sum), "1" ((__force u32)sum<<16)
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: "cc");
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return (__force __sum16)sum;
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}
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static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
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__u32 len, __u8 proto,
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__wsum sum)
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{
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__asm__ __volatile__("addcc\t%1, %0, %0\n\t"
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"addxcc\t%2, %0, %0\n\t"
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"addxcc\t%3, %0, %0\n\t"
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"addx\t%0, %%g0, %0\n\t"
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: "=r" (sum), "=r" (saddr)
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: "r" (daddr), "r" (proto + len), "0" (sum),
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"1" (saddr)
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: "cc");
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return sum;
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}
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/*
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* computes the checksum of the TCP/UDP pseudo-header
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* returns a 16-bit checksum, already complemented
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*/
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static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
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__u32 len, __u8 proto,
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__wsum sum)
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{
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return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
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}
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#define _HAVE_ARCH_IPV6_CSUM
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static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__u32 len, __u8 proto, __wsum sum)
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{
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__asm__ __volatile__ (
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"addcc %3, %4, %%g4\n\t"
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"addxcc %5, %%g4, %%g4\n\t"
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"ld [%2 + 0x0c], %%g2\n\t"
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"ld [%2 + 0x08], %%g3\n\t"
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"addxcc %%g2, %%g4, %%g4\n\t"
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"ld [%2 + 0x04], %%g2\n\t"
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"addxcc %%g3, %%g4, %%g4\n\t"
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"ld [%2 + 0x00], %%g3\n\t"
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"addxcc %%g2, %%g4, %%g4\n\t"
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"ld [%1 + 0x0c], %%g2\n\t"
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"addxcc %%g3, %%g4, %%g4\n\t"
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"ld [%1 + 0x08], %%g3\n\t"
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"addxcc %%g2, %%g4, %%g4\n\t"
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"ld [%1 + 0x04], %%g2\n\t"
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"addxcc %%g3, %%g4, %%g4\n\t"
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"ld [%1 + 0x00], %%g3\n\t"
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"addxcc %%g2, %%g4, %%g4\n\t"
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"addxcc %%g3, %%g4, %0\n\t"
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"addx 0, %0, %0\n"
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: "=&r" (sum)
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: "r" (saddr), "r" (daddr),
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"r"(htonl(len)), "r"(htonl(proto)), "r"(sum)
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: "g2", "g3", "g4", "cc");
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return csum_fold(sum);
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}
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/* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
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static inline __sum16 ip_compute_csum(const void *buff, int len)
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{
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return csum_fold(csum_partial(buff, len, 0));
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}
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#define HAVE_ARCH_CSUM_ADD
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static inline __wsum csum_add(__wsum csum, __wsum addend)
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{
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__asm__ __volatile__(
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"addcc %0, %1, %0\n"
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"addx %0, %%g0, %0"
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: "=r" (csum)
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: "r" (addend), "0" (csum));
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return csum;
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}
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#endif /* !(__SPARC_CHECKSUM_H) */
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