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FRV: Add support for emulation of userspace atomic ops [try #2]

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Use traps 120-126 to emulate atomic cmpxchg32, xchg32, and XOR-, OR-, AND-, SUB-
and ADD-to-memory operations for userspace.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells
2008-04-10 16:10:55 +01:00
committed by Linus Torvalds
parent 0c93d8e4d3
commit e31c243f98
4 changed files with 268 additions and 1 deletions
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include/asm-frv/spr-regs.h
+14
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@@ -99,9 +99,23 @@
#define TBR_TT_TRAP1 (0x81 << 4)
#define TBR_TT_TRAP2 (0x82 << 4)
#define TBR_TT_TRAP3 (0x83 << 4)
#define TBR_TT_TRAP120 (0xf8 << 4)
#define TBR_TT_TRAP121 (0xf9 << 4)
#define TBR_TT_TRAP122 (0xfa << 4)
#define TBR_TT_TRAP123 (0xfb << 4)
#define TBR_TT_TRAP124 (0xfc << 4)
#define TBR_TT_TRAP125 (0xfd << 4)
#define TBR_TT_TRAP126 (0xfe << 4)
#define TBR_TT_BREAK (0xff << 4)
#define TBR_TT_ATOMIC_CMPXCHG32 TBR_TT_TRAP120
#define TBR_TT_ATOMIC_XCHG32 TBR_TT_TRAP121
#define TBR_TT_ATOMIC_XOR TBR_TT_TRAP122
#define TBR_TT_ATOMIC_OR TBR_TT_TRAP123
#define TBR_TT_ATOMIC_AND TBR_TT_TRAP124
#define TBR_TT_ATOMIC_SUB TBR_TT_TRAP125
#define TBR_TT_ATOMIC_ADD TBR_TT_TRAP126
#define __get_TBR() ({ unsigned long x; asm volatile("movsg tbr,%0" : "=r"(x)); x; })
/*