linux/arch/tile/lib/memcpy_user_64.c
Chris Metcalf 18aecc2b64 arch/tile: finish enabling support for TILE-Gx 64-bit chip
This support was partially present in the existing code (look for
"__tilegx__" ifdefs) but with this change you can build a working
kernel using the TILE-Gx toolchain and ARCH=tilegx.

Most of these files are new, generally adding a foo_64.c file
where previously there was just a foo_32.c file.

The ARCH=tilegx directive redirects to arch/tile, not arch/tilegx,
using the existing SRCARCH mechanism in the top-level Makefile.

Changes to existing files:

- <asm/bitops.h> and <asm/bitops_32.h> changed to factor the
  include of <asm-generic/bitops/non-atomic.h> in the common header.

- <asm/compat.h> and arch/tile/kernel/compat.c changed to remove
  the "const" markers I had put on compat_sys_execve() when trying
  to match some recent similar changes to the non-compat execve.
  It turns out the compat version wasn't "upgraded" to use const.

- <asm/opcode-tile_64.h> and <asm/opcode_constants_64.h> were
  previously included accidentally, with the 32-bit contents.  Now
  they have the proper 64-bit contents.

Finally, I had to hack the existing hacky drivers/input/input-compat.h
to add yet another "#ifdef" for INPUT_COMPAT_TEST (same as x86_64).

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> [drivers/input]
2011-05-12 15:52:12 -04:00

86 lines
2.5 KiB
C

/*
* Copyright 2011 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*
* Do memcpy(), but trap and return "n" when a load or store faults.
*
* Note: this idiom only works when memcpy() compiles to a leaf function.
* If "sp" is updated during memcpy, the "jrp lr" will be incorrect.
*
* Also note that we are capturing "n" from the containing scope here.
*/
#define _ST(p, inst, v) \
({ \
asm("1: " #inst " %0, %1;" \
".pushsection .coldtext.memcpy,\"ax\";" \
"2: { move r0, %2; jrp lr };" \
".section __ex_table,\"a\";" \
".quad 1b, 2b;" \
".popsection" \
: "=m" (*(p)) : "r" (v), "r" (n)); \
})
#define _LD(p, inst) \
({ \
unsigned long __v; \
asm("1: " #inst " %0, %1;" \
".pushsection .coldtext.memcpy,\"ax\";" \
"2: { move r0, %2; jrp lr };" \
".section __ex_table,\"a\";" \
".quad 1b, 2b;" \
".popsection" \
: "=r" (__v) : "m" (*(p)), "r" (n)); \
__v; \
})
#define USERCOPY_FUNC __copy_to_user_inatomic
#define ST1(p, v) _ST((p), st1, (v))
#define ST2(p, v) _ST((p), st2, (v))
#define ST4(p, v) _ST((p), st4, (v))
#define ST8(p, v) _ST((p), st, (v))
#define LD1 LD
#define LD2 LD
#define LD4 LD
#define LD8 LD
#include "memcpy_64.c"
#define USERCOPY_FUNC __copy_from_user_inatomic
#define ST1 ST
#define ST2 ST
#define ST4 ST
#define ST8 ST
#define LD1(p) _LD((p), ld1u)
#define LD2(p) _LD((p), ld2u)
#define LD4(p) _LD((p), ld4u)
#define LD8(p) _LD((p), ld)
#include "memcpy_64.c"
#define USERCOPY_FUNC __copy_in_user_inatomic
#define ST1(p, v) _ST((p), st1, (v))
#define ST2(p, v) _ST((p), st2, (v))
#define ST4(p, v) _ST((p), st4, (v))
#define ST8(p, v) _ST((p), st, (v))
#define LD1(p) _LD((p), ld1u)
#define LD2(p) _LD((p), ld2u)
#define LD4(p) _LD((p), ld4u)
#define LD8(p) _LD((p), ld)
#include "memcpy_64.c"
unsigned long __copy_from_user_zeroing(void *to, const void __user *from,
unsigned long n)
{
unsigned long rc = __copy_from_user_inatomic(to, from, n);
if (unlikely(rc))
memset(to + n - rc, 0, rc);
return rc;
}