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#include <machine/asm.h>
/*
* ulong _tas(ulong*);
*/
#if __ARM_ARCH >= 6
#if __ARM_ARCH >= 7
#define DMB dmb
#else
#define DMB mcr p15, 0, r0, c7, c10, 5
#endif
ENTRY(_tas)
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
@ link register save eliminated.
@ lr needed for prologue
DMB
mov r1, r0
mov r2, #0xaa
.Loop:
ldrex r0, [r1]
cmp r0, #0
bne .Lockbusy
strex r3, r2, [r1]
cmp r3, #0
bne .Loop
DMB
bx lr
.Lockbusy:
clrex
bx lr
END(_tas)
#else /* __ARM_ARCH <= 5*/
ENTRY(_tas)
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
@ link register save eliminated.
@ lr needed for prologue
mov r3, #1
mov r1, r0
swp r0, r3, [r1]
bx lr
END(_tas)
#endif /* __ARM_ARCH <= 5*/
/*
* void FPsave(void *);
*/
ENTRY(FPsave)
@ args = 0, pretend = 0, frame = 4
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {fp, ip, lr, pc}
sub fp, ip, #4
sub sp, sp, #4
str r0, [fp, #-16]
ldmea fp, {fp, sp, pc}
END(FPsave)
/*
* void FPrestore(void *);
*/
ENTRY(FPrestore)
@ args = 0, pretend = 0, frame = 4
@ frame_needed = 1, uses_anonymous_args = 0
mov ip, sp
stmfd sp!, {fp, ip, lr, pc}
sub fp, ip, #4
sub sp, sp, #4
str r0, [fp, #-16]
ldmea fp, {fp, sp, pc}
END(FPrestore)
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