static int emulate_stw()

in kernel/unaligned.c [299:344]

• 41 lines of code
• 3 McCabe index (conditional complexity)

static int emulate_stw(struct pt_regs *regs, int frreg, int flop)
{
	unsigned long val;
	int ret;

	if (flop)
		val = ((__u32*)(regs->fr))[frreg];
	else if (frreg)
		val = regs->gr[frreg];
	else
		val = 0;

	DPRINTF("store r%d (0x" RFMT ") to " RFMT ":" RFMT " for 4 bytes\n", frreg, 
		val, regs->isr, regs->ior);


	__asm__ __volatile__ (
"	mtsp %3, %%sr1\n"
"	zdep	%2, 28, 2, %%r19\n"
"	dep	%%r0, 31, 2, %2\n"
"	mtsar	%%r19\n"
"	depwi,z	-2, %%sar, 32, %%r19\n"
"1:	ldw	0(%%sr1,%2),%%r20\n"
"2:	ldw	4(%%sr1,%2),%%r21\n"
"	vshd	%%r0, %1, %%r22\n"
"	vshd	%1, %%r0, %%r1\n"
"	and	%%r20, %%r19, %%r20\n"
"	andcm	%%r21, %%r19, %%r21\n"
"	or	%%r22, %%r20, %%r20\n"
"	or	%%r1, %%r21, %%r21\n"
"	stw	%%r20,0(%%sr1,%2)\n"
"	stw	%%r21,4(%%sr1,%2)\n"
"	copy	%%r0, %0\n"
"3:	\n"
"	.section .fixup,\"ax\"\n"
"4:	ldi	-2, %0\n"
	FIXUP_BRANCH(3b)
"	.previous\n"
	ASM_EXCEPTIONTABLE_ENTRY(1b,4b)
	ASM_EXCEPTIONTABLE_ENTRY(2b,4b)
	: "=r" (ret)
	: "r" (val), "r" (regs->ior), "r" (regs->isr)
	: "r19", "r20", "r21", "r22", "r1", FIXUP_BRANCH_CLOBBER );

	return 0;
}