42990701f9
When dereferencing the memory address contained in a register and modifying the value at that memory address, the register should not be listed in the inline asm outputs. The value at the memory address is an output (which is taken care of with the "memory" clobber), not the register. Signed-off-by: Matt Fleming <matt@console-pimps.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
#ifndef __ASM_SH_CMPXCHG_LLSC_H
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#define __ASM_SH_CMPXCHG_LLSC_H
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static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
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{
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unsigned long retval;
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unsigned long tmp;
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__asm__ __volatile__ (
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"1: \n\t"
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"movli.l @%2, %0 ! xchg_u32 \n\t"
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"mov %0, %1 \n\t"
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"mov %3, %0 \n\t"
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"movco.l %0, @%2 \n\t"
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"bf 1b \n\t"
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"synco \n\t"
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: "=&z"(tmp), "=&r" (retval)
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: "r" (m), "r" (val)
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: "t", "memory"
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);
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return retval;
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}
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static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
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{
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unsigned long retval;
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unsigned long tmp;
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__asm__ __volatile__ (
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"1: \n\t"
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"movli.l @%2, %0 ! xchg_u8 \n\t"
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"mov %0, %1 \n\t"
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"mov %3, %0 \n\t"
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"movco.l %0, @%2 \n\t"
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"bf 1b \n\t"
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"synco \n\t"
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: "=&z"(tmp), "=&r" (retval)
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: "r" (m), "r" (val & 0xff)
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: "t", "memory"
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);
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return retval;
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}
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static inline unsigned long
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__cmpxchg_u32(volatile int *m, unsigned long old, unsigned long new)
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{
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unsigned long retval;
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unsigned long tmp;
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__asm__ __volatile__ (
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"1: \n\t"
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"movli.l @%2, %0 ! __cmpxchg_u32 \n\t"
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"mov %0, %1 \n\t"
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"cmp/eq %1, %3 \n\t"
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"bf 2f \n\t"
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"mov %3, %0 \n\t"
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"2: \n\t"
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"movco.l %0, @%2 \n\t"
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"bf 1b \n\t"
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"synco \n\t"
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: "=&z" (tmp), "=&r" (retval)
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: "r" (m), "r" (old), "r" (new)
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: "t", "memory"
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);
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return retval;
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}
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#endif /* __ASM_SH_CMPXCHG_LLSC_H */
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