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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/sparc/include/asm/futex_64.h | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | arch/sparc/include/asm/futex_64.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/futex_64.h b/arch/sparc/include/asm/futex_64.h new file mode 100644 index 0000000000..72de967318 --- /dev/null +++ b/arch/sparc/include/asm/futex_64.h @@ -0,0 +1,94 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _SPARC64_FUTEX_H +#define _SPARC64_FUTEX_H + +#include <linux/futex.h> +#include <linux/uaccess.h> +#include <asm/errno.h> + +#define __futex_cas_op(insn, ret, oldval, uaddr, oparg) \ + __asm__ __volatile__( \ + "\n1: lduwa [%3] %%asi, %2\n" \ + " " insn "\n" \ + "2: casa [%3] %%asi, %2, %1\n" \ + " cmp %2, %1\n" \ + " bne,pn %%icc, 1b\n" \ + " mov 0, %0\n" \ + "3:\n" \ + " .section .fixup,#alloc,#execinstr\n" \ + " .align 4\n" \ + "4: sethi %%hi(3b), %0\n" \ + " jmpl %0 + %%lo(3b), %%g0\n" \ + " mov %5, %0\n" \ + " .previous\n" \ + " .section __ex_table,\"a\"\n" \ + " .align 4\n" \ + " .word 1b, 4b\n" \ + " .word 2b, 4b\n" \ + " .previous\n" \ + : "=&r" (ret), "=&r" (oldval), "=&r" (tem) \ + : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \ + : "memory") + +static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, + u32 __user *uaddr) +{ + int oldval = 0, ret, tem; + + if (unlikely((((unsigned long) uaddr) & 0x3UL))) + return -EINVAL; + + switch (op) { + case FUTEX_OP_SET: + __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg); + break; + case FUTEX_OP_ADD: + __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg); + break; + case FUTEX_OP_OR: + __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg); + break; + case FUTEX_OP_ANDN: + __futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg); + break; + case FUTEX_OP_XOR: + __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg); + break; + default: + ret = -ENOSYS; + } + + if (!ret) + *oval = oldval; + + return ret; +} + +static inline int +futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, + u32 oldval, u32 newval) +{ + int ret = 0; + + __asm__ __volatile__( + "\n1: casa [%4] %%asi, %3, %1\n" + "2:\n" + " .section .fixup,#alloc,#execinstr\n" + " .align 4\n" + "3: sethi %%hi(2b), %0\n" + " jmpl %0 + %%lo(2b), %%g0\n" + " mov %5, %0\n" + " .previous\n" + " .section __ex_table,\"a\"\n" + " .align 4\n" + " .word 1b, 3b\n" + " .previous\n" + : "+r" (ret), "=r" (newval) + : "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT) + : "memory"); + + *uval = newval; + return ret; +} + +#endif /* !(_SPARC64_FUTEX_H) */ |