mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-01 19:36:48 +07:00
8cf662ed3e
Old Microblaze toolchain supported "b" contstrains for all register but it always points to general purpose reg. New Microblaze toolchain is more strict in this and general purpose register should be used there "r". Signed-off-by: Michal Simek <monstr@monstr.eu>
130 lines
2.8 KiB
C
130 lines
2.8 KiB
C
#ifndef _ASM_MICROBLAZE_FUTEX_H
|
|
#define _ASM_MICROBLAZE_FUTEX_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/futex.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/errno.h>
|
|
|
|
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
|
|
({ \
|
|
__asm__ __volatile__ ( \
|
|
"1: lwx %0, %2, r0; " \
|
|
insn \
|
|
"2: swx %1, %2, r0; \
|
|
addic %1, r0, 0; \
|
|
bnei %1, 1b; \
|
|
3: \
|
|
.section .fixup,\"ax\"; \
|
|
4: brid 3b; \
|
|
addik %1, r0, %3; \
|
|
.previous; \
|
|
.section __ex_table,\"a\"; \
|
|
.word 1b,4b,2b,4b; \
|
|
.previous;" \
|
|
: "=&r" (oldval), "=&r" (ret) \
|
|
: "r" (uaddr), "i" (-EFAULT), "r" (oparg) \
|
|
); \
|
|
})
|
|
|
|
static inline int
|
|
futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
|
|
{
|
|
int op = (encoded_op >> 28) & 7;
|
|
int cmp = (encoded_op >> 24) & 15;
|
|
int oparg = (encoded_op << 8) >> 20;
|
|
int cmparg = (encoded_op << 20) >> 20;
|
|
int oldval = 0, ret;
|
|
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
|
|
oparg = 1 << oparg;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
|
return -EFAULT;
|
|
|
|
pagefault_disable();
|
|
|
|
switch (op) {
|
|
case FUTEX_OP_SET:
|
|
__futex_atomic_op("or %1,%4,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ADD:
|
|
__futex_atomic_op("add %1,%0,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_OR:
|
|
__futex_atomic_op("or %1,%0,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ANDN:
|
|
__futex_atomic_op("andn %1,%0,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_XOR:
|
|
__futex_atomic_op("xor %1,%0,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
default:
|
|
ret = -ENOSYS;
|
|
}
|
|
|
|
pagefault_enable();
|
|
|
|
if (!ret) {
|
|
switch (cmp) {
|
|
case FUTEX_OP_CMP_EQ:
|
|
ret = (oldval == cmparg);
|
|
break;
|
|
case FUTEX_OP_CMP_NE:
|
|
ret = (oldval != cmparg);
|
|
break;
|
|
case FUTEX_OP_CMP_LT:
|
|
ret = (oldval < cmparg);
|
|
break;
|
|
case FUTEX_OP_CMP_GE:
|
|
ret = (oldval >= cmparg);
|
|
break;
|
|
case FUTEX_OP_CMP_LE:
|
|
ret = (oldval <= cmparg);
|
|
break;
|
|
case FUTEX_OP_CMP_GT:
|
|
ret = (oldval > cmparg);
|
|
break;
|
|
default:
|
|
ret = -ENOSYS;
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static inline int
|
|
futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
|
|
u32 oldval, u32 newval)
|
|
{
|
|
int ret = 0, cmp;
|
|
u32 prev;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
|
return -EFAULT;
|
|
|
|
__asm__ __volatile__ ("1: lwx %1, %3, r0; \
|
|
cmp %2, %1, %4; \
|
|
beqi %2, 3f; \
|
|
2: swx %5, %3, r0; \
|
|
addic %2, r0, 0; \
|
|
bnei %2, 1b; \
|
|
3: \
|
|
.section .fixup,\"ax\"; \
|
|
4: brid 3b; \
|
|
addik %0, r0, %6; \
|
|
.previous; \
|
|
.section __ex_table,\"a\"; \
|
|
.word 1b,4b,2b,4b; \
|
|
.previous;" \
|
|
: "+r" (ret), "=&r" (prev), "=&r"(cmp) \
|
|
: "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT));
|
|
|
|
*uval = prev;
|
|
return ret;
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif
|