diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 15:35:32 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 15:35:32 -0700 |
commit | 0798b1dbfbd9ff2a370c5968c5f0621ef0075fe0 (patch) | |
tree | c7f61ab9683786a070da0933b9981fc74a4d865f /arch/tile/kernel/futex_64.S | |
parent | ad363e0916423b2e6cdfcdc30ae707ec709f0a65 (diff) | |
parent | 6738d3210aabe3016a1b03cd98a7fc479c229197 (diff) | |
download | kernel_samsung_smdk4412-0798b1dbfbd9ff2a370c5968c5f0621ef0075fe0.zip kernel_samsung_smdk4412-0798b1dbfbd9ff2a370c5968c5f0621ef0075fe0.tar.gz kernel_samsung_smdk4412-0798b1dbfbd9ff2a370c5968c5f0621ef0075fe0.tar.bz2 |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile
* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: (26 commits)
arch/tile: prefer "tilepro" as the name of the 32-bit architecture
compat: include aio_abi.h for aio_context_t
arch/tile: cleanups for tilegx compat mode
arch/tile: allocate PCI IRQs later in boot
arch/tile: support signal "exception-trace" hook
arch/tile: use better definitions of xchg() and cmpxchg()
include/linux/compat.h: coding-style fixes
tile: add an RTC driver for the Tilera hypervisor
arch/tile: finish enabling support for TILE-Gx 64-bit chip
compat: fixes to allow working with tile arch
arch/tile: update defconfig file to something more useful
tile: do_hardwall_trap: do not play with task->sighand
tile: replace mm->cpu_vm_mask with mm_cpumask()
tile,mn10300: add device parameter to dma_cache_sync()
audit: support the "standard" <asm-generic/unistd.h>
arch/tile: clarify flush_buffer()/finv_buffer() function names
arch/tile: kernel-related cleanups from removing static page size
arch/tile: various header improvements for building drivers
arch/tile: disable GX prefetcher during cache flush
arch/tile: tolerate disabling CONFIG_BLK_DEV_INITRD
...
Diffstat (limited to 'arch/tile/kernel/futex_64.S')
-rw-r--r-- | arch/tile/kernel/futex_64.S | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/tile/kernel/futex_64.S b/arch/tile/kernel/futex_64.S new file mode 100644 index 0000000..f465d1e --- /dev/null +++ b/arch/tile/kernel/futex_64.S @@ -0,0 +1,55 @@ +/* + * 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. + * + * Atomically access user memory, but use MMU to avoid propagating + * kernel exceptions. + */ + +#include <linux/linkage.h> +#include <asm/errno.h> +#include <asm/futex.h> +#include <asm/page.h> +#include <asm/processor.h> + +/* + * Provide a set of atomic memory operations supporting <asm/futex.h>. + * + * r0: user address to manipulate + * r1: new value to write, or for cmpxchg, old value to compare against + * r2: (cmpxchg only) new value to write + * + * Return __get_user struct, r0 with value, r1 with error. + */ +#define FUTEX_OP(name, ...) \ +STD_ENTRY(futex_##name) \ + __VA_ARGS__; \ + { \ + move r1, zero; \ + jrp lr \ + }; \ + STD_ENDPROC(futex_##name); \ + .pushsection __ex_table,"a"; \ + .quad 1b, get_user_fault; \ + .popsection + + .pushsection .fixup,"ax" +get_user_fault: + { movei r1, -EFAULT; jrp lr } + ENDPROC(get_user_fault) + .popsection + +FUTEX_OP(cmpxchg, mtspr CMPEXCH_VALUE, r1; 1: cmpexch4 r0, r0, r2) +FUTEX_OP(set, 1: exch4 r0, r0, r1) +FUTEX_OP(add, 1: fetchadd4 r0, r0, r1) +FUTEX_OP(or, 1: fetchor4 r0, r0, r1) +FUTEX_OP(andn, nor r1, r1, zero; 1: fetchand4 r0, r0, r1) |