diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-01-16 17:59:44 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-02-02 21:21:53 +0000 |
| commit | a16ede35a2659170c855c5d267776666c0630f1f (patch) | |
| tree | 67773b1c9aac890cd5838a6d58983f2d8643a1ba | |
| parent | e5310f611d17ed4e92e0d4e46fd9f6fb40e66df3 (diff) | |
ARM: bitops: ensure set/clear/change bitops take a word-aligned pointer
Add additional instructions to our assembly bitops functions to ensure
that they only operate on word-aligned pointers. This will be necessary
when we switch these operations to use the word-based exclusive
operations.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/lib/bitops.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/lib/bitops.h b/arch/arm/lib/bitops.h index d42252918bfb..bd00551fb797 100644 --- a/arch/arm/lib/bitops.h +++ b/arch/arm/lib/bitops.h @@ -1,6 +1,8 @@ #if __LINUX_ARM_ARCH__ >= 6 && defined(CONFIG_CPU_32v6K) .macro bitop, instr + ands ip, r1, #3 + strneb r1, [ip] @ assert word-aligned mov r2, #1 and r3, r0, #7 @ Get bit offset add r1, r1, r0, lsr #3 @ Get byte offset @@ -14,6 +16,8 @@ .endm .macro testop, instr, store + ands ip, r1, #3 + strneb r1, [ip] @ assert word-aligned and r3, r0, #7 @ Get bit offset mov r2, #1 add r1, r1, r0, lsr #3 @ Get byte offset @@ -32,6 +36,8 @@ .endm #else .macro bitop, instr + ands ip, r1, #3 + strneb r1, [ip] @ assert word-aligned and r2, r0, #7 mov r3, #1 mov r3, r3, lsl r2 @@ -52,6 +58,8 @@ * to avoid dirtying the data cache. */ .macro testop, instr, store + ands ip, r1, #3 + strneb r1, [ip] @ assert word-aligned add r1, r1, r0, lsr #3 and r3, r0, #7 mov r0, #1 |