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/*
 * Handle a system call.
 */
	.stabs	"arch/powerpc/kernel/",N_SO,0,0,0f
	.stabs	"entry_32.S",N_SO,0,0,0f
0:

_GLOBAL(DoSyscall)
	stw	r0,THREAD+LAST_SYSCALL(r2)
	stw	r3,ORIG_GPR3(r1)
	li	r12,0
	stw	r12,RESULT(r1)
	lwz	r11,_CCR(r1)	/* Clear SO bit in CR */
	rlwinm	r11,r11,0,4,2
	stw	r11,_CCR(r1)
#ifdef SHOW_SYSCALLS
	bl	do_show_syscall
#endif /* SHOW_SYSCALLS */
	rlwinm	r10,r1,0,0,(31-THREAD_SHIFT)	/* current_thread_info() */
	lwz	r11,TI_FLAGS(r10)
	andi.	r11,r11,_TIF_SYSCALL_T_OR_A
	bne-	syscall_dotrace
syscall_dotrace_cont:
	cmplwi	0,r0,NR_syscalls
	lis	r10,sys_call_table@h
	ori	r10,r10,sys_call_table@l
	slwi	r0,r0,2
	bge-	66f
	lwzx	r10,r10,r0	/* Fetch system call handler [ptr] */
	mtlr	r10
	addi	r9,r1,STACK_FRAME_OVERHEAD
	PPC440EP_ERR42
	blrl			/* Call handler */
	.globl	ret_from_syscall
ret_from_syscall:
#ifdef SHOW_SYSCALLS
	bl	do_show_syscall_exit
#endif
	mr	r6,r3
	rlwinm	r12,r1,0,0,(31-THREAD_SHIFT)	/* current_thread_info() */
	/* disable interrupts so current_thread_info()->flags can't change */
	LOAD_MSR_KERNEL(r10,MSR_KERNEL)	/* doesn't include MSR_EE */
	SYNC
	MTMSRD(r10)
	lwz	r9,TI_FLAGS(r12)
	li	r8,-_LAST_ERRNO
	andi.	r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP|_TIF_USER_WORK_MASK|_TIF_PERSYSCALL_MASK)
	bne-	syscall_exit_work
	cmplw	0,r3,r8
	blt+	syscall_exit_cont
	lwz	r11,_CCR(r1)			/* Load CR */
	neg	r3,r3
	oris	r11,r11,0x1000	/* Set SO bit in CR */
	stw	r11,_CCR(r1)
syscall_exit_cont:
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
	/* If the process has its own DBCR0 value, load it up.  The single
	   step bit tells us that dbcr0 should be loaded. */
	lwz	r0,THREAD+THREAD_DBCR0(r2)
	andis.	r10,r0,DBCR0_IC@h
	bnel-	load_dbcr0
#endif
	stwcx.	r0,0,r1			/* to clear the reservation */
	lwz	r4,_LINK(r1)
	lwz	r5,_CCR(r1)
	mtlr	r4
	mtcr	r5
	lwz	r7,_NIP(r1)
	lwz	r8,_MSR(r1)
	FIX_SRR1(r8, r0)
	lwz	r2,GPR2(r1)
	lwz	r1,GPR1(r1)
	mtspr	SPRN_SRR0,r7
	mtspr	SPRN_SRR1,r8
	SYNC
	RFI
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