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m68k: modify user space access functions to support ColdFire CPUs

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Modify the user space access functions to support the ColdFire V4e cores
running with MMU enabled.

The ColdFire processors do not support the "moves" instruction used by
the traditional 680x0 processors for moving data into and out of another
address space. They only support the notion of a single address space,
and you use the usual "move" instruction to access that.

Create a new config symbol (CONFIG_CPU_HAS_ADDRESS_SPACES) to mark the
CPU types that support separate address spaces, and thus also support
the sfc/dfc registers and the "moves" instruction that go along with that.

The code is almost identical for user space access, so lets just use a
define to choose either the "move" or "moves" in the assembler code.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Matt Waddel <mwaddel@yahoo.com>
Acked-by: Kurt Mahan <kmahan@xmission.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Greg Ungerer 2011-10-14 14:43:30 +10:00
parent 2c9b82adb5
commit e08d703cc2
5 changed files with 49 additions and 26 deletions
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22
arch/m68k/lib/uaccess.c
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@ -15,17 +15,17 @@ unsigned long __generic_copy_from_user(void *to, const void __user *from,
asm volatile ("\n"
" tst.l %0\n"
" jeq 2f\n"
"1: moves.l (%1)+,%3\n"
"1: "MOVES".l (%1)+,%3\n"
" move.l %3,(%2)+\n"
" subq.l #1,%0\n"
" jne 1b\n"
"2: btst #1,%5\n"
" jeq 4f\n"
"3: moves.w (%1)+,%3\n"
"3: "MOVES".w (%1)+,%3\n"
" move.w %3,(%2)+\n"
"4: btst #0,%5\n"
" jeq 6f\n"
"5: moves.b (%1)+,%3\n"
"5: "MOVES".b (%1)+,%3\n"
" move.b %3,(%2)+\n"
"6:\n"
" .section .fixup,\"ax\"\n"
@ -68,17 +68,17 @@ unsigned long __generic_copy_to_user(void __user *to, const void *from,
" tst.l %0\n"
" jeq 4f\n"
"1: move.l (%1)+,%3\n"
"2: moves.l %3,(%2)+\n"
"2: "MOVES".l %3,(%2)+\n"
"3: subq.l #1,%0\n"
" jne 1b\n"
"4: btst #1,%5\n"
" jeq 6f\n"
" move.w (%1)+,%3\n"
"5: moves.w %3,(%2)+\n"
"5: "MOVES".w %3,(%2)+\n"
"6: btst #0,%5\n"
" jeq 8f\n"
" move.b (%1)+,%3\n"
"7: moves.b %3,(%2)+\n"
"7: "MOVES".b %3,(%2)+\n"
"8:\n"
" .section .fixup,\"ax\"\n"
" .even\n"
@ -115,7 +115,7 @@ long strncpy_from_user(char *dst, const char __user *src, long count)
return count;
asm volatile ("\n"
"1: moves.b (%2)+,%4\n"
"1: "MOVES".b (%2)+,%4\n"
" move.b %4,(%1)+\n"
" jeq 2f\n"
" subq.l #1,%3\n"
@ -152,7 +152,7 @@ long strnlen_user(const char __user *src, long n)
asm volatile ("\n"
"1: subq.l #1,%1\n"
" jmi 3f\n"
"2: moves.b (%0)+,%2\n"
"2: "MOVES".b (%0)+,%2\n"
" tst.b %2\n"
" jne 1b\n"
" jra 4f\n"
@ -188,15 +188,15 @@ unsigned long __clear_user(void __user *to, unsigned long n)
asm volatile ("\n"
" tst.l %0\n"
" jeq 3f\n"
"1: moves.l %2,(%1)+\n"
"1: "MOVES".l %2,(%1)+\n"
"2: subq.l #1,%0\n"
" jne 1b\n"
"3: btst #1,%4\n"
" jeq 5f\n"
"4: moves.w %2,(%1)+\n"
"4: "MOVES".w %2,(%1)+\n"
"5: btst #0,%4\n"
" jeq 7f\n"
"6: moves.b %2,(%1)\n"
"6: "MOVES".b %2,(%1)\n"
"7:\n"
" .section .fixup,\"ax\"\n"
" .even\n"