Viewing file:  cmpxchg-grb.h (2.8 KB) -rw-r--r--
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_SH_CMPXCHG_GRB_H
#define __ASM_SH_CMPXCHG_GRB_H
static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
{
unsigned long retval;
__asm__ __volatile__ (
" .align 2 \n\t"
" mova 1f, r0 \n\t" /* r0 = end point */
" nop \n\t"
" mov r15, r1 \n\t" /* r1 = saved sp */
" mov #-4, r15 \n\t" /* LOGIN */
" mov.l @%1, %0 \n\t" /* load old value */
" mov.l %2, @%1 \n\t" /* store new value */
"1: mov r1, r15 \n\t" /* LOGOUT */
: "=&r" (retval),
"+r" (m),
"+r" (val) /* inhibit r15 overloading */
:
: "memory", "r0", "r1");
return retval;
}
static inline unsigned long xchg_u16(volatile u16 *m, unsigned long val)
{
unsigned long retval;
__asm__ __volatile__ (
" .align 2 \n\t"
" mova 1f, r0 \n\t" /* r0 = end point */
" mov r15, r1 \n\t" /* r1 = saved sp */
" mov #-6, r15 \n\t" /* LOGIN */
" mov.w @%1, %0 \n\t" /* load old value */
" extu.w %0, %0 \n\t" /* extend as unsigned */
" mov.w %2, @%1 \n\t" /* store new value */
"1: mov r1, r15 \n\t" /* LOGOUT */
: "=&r" (retval),
"+r" (m),
"+r" (val) /* inhibit r15 overloading */
:
: "memory" , "r0", "r1");
return retval;
}
static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
{
unsigned long retval;
__asm__ __volatile__ (
" .align 2 \n\t"
" mova 1f, r0 \n\t" /* r0 = end point */
" mov r15, r1 \n\t" /* r1 = saved sp */
" mov #-6, r15 \n\t" /* LOGIN */
" mov.b @%1, %0 \n\t" /* load old value */
" extu.b %0, %0 \n\t" /* extend as unsigned */
" mov.b %2, @%1 \n\t" /* store new value */
"1: mov r1, r15 \n\t" /* LOGOUT */
: "=&r" (retval),
"+r" (m),
"+r" (val) /* inhibit r15 overloading */
:
: "memory" , "r0", "r1");
return retval;
}
static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
unsigned long new)
{
unsigned long retval;
__asm__ __volatile__ (
" .align 2 \n\t"
" mova 1f, r0 \n\t" /* r0 = end point */
" nop \n\t"
" mov r15, r1 \n\t" /* r1 = saved sp */
" mov #-8, r15 \n\t" /* LOGIN */
" mov.l @%3, %0 \n\t" /* load old value */
" cmp/eq %0, %1 \n\t"
" bf 1f \n\t" /* if not equal */
" mov.l %2, @%3 \n\t" /* store new value */
"1: mov r1, r15 \n\t" /* LOGOUT */
: "=&r" (retval),
"+r" (old), "+r" (new) /* old or new can be r15 */
: "r" (m)
: "memory" , "r0", "r1", "t");
return retval;
}
#endif /* __ASM_SH_CMPXCHG_GRB_H */
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