shithub: purgatorio

ref: c116550e6a41572796e4db65e4f6acbcb3d9d6f8
dir: /emu/Irix/asm-mips.s/

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#include <sys/regdef.h>
#include <sys/asm.h>

LEAF(FPsave)
	cfc1	t0, $31
	sw	t0, 0(a0)		/* a0 is argument */
	j	$31
	END(FPsave)

LEAF(FPrestore)
	lw	t0, 0(a0)		/* a0 is argument */
	ctc1	t0, $31
	j	$31
	END(FPrestore)


/*
 * lock from r4000 book
 */
LEAF(_tas)
	.set 	noreorder
1:
	ll	v0,0(a0)		/* a0 is argument */
	or	t1, v0, 1
	sc	t1,0(a0)
	beq	t1,zero,1b	
	nop
	j	$31			/* lock held */
	nop
	.set 	reorder
	END(_tas)