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#include "arm.s"
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/*
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 *  This is the first jump from kernel to user mode.
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 *  Fake a return from interrupt.
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 *
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 *  Enter with R0 containing the user stack pointer.
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 *  UTZERO + 0x20 is always the entry point.
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 *
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 */
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TEXT touser(SB), 1, $-4
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	/* store the user stack pointer into the USR_r13 */
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	MOVM.DB.W [R0], (R13)
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	/* avoid the ambiguity described in notes/movm.w. */
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	MOVM.S	(R13), [R13]
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	ADD	$4, R13			/* pop new user SP */
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	/* set up a PSR for user level */
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	MOVW	$(PsrMusr), R0
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	MOVW	R0, SPSR
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	/* push new user PSR */
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	MOVM.DB.W [R0], (R13)
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	/* push the new user PC on the stack */
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	MOVW	$(UTZERO+0x20), R0
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	MOVM.DB.W [R0], (R13)
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	RFEV7W(13)
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/*
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 *  here to jump to a newly forked process
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 */
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TEXT forkret(SB), 1, $-4
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	ADD	$(4*NREGS), R13		/* make r13 point to ureg->type */
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	MOVW	8(R13), R14		/* restore link */
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	MOVW	4(R13), R0		/* restore SPSR */
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	B	rfue(SB)