static inline void simulate_lwa()

in kernel/traps.c [336:376]

• 32 lines of code
• 5 McCabe index (conditional complexity)

static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
				unsigned int insn)
{
	unsigned int ra, rd;
	unsigned long value;
	unsigned long orig_pc;
	long imm;

	const struct exception_table_entry *entry;

	orig_pc = regs->pc;
	adjust_pc(regs, address);

	ra = (insn >> 16) & 0x1f;
	rd = (insn >> 21) & 0x1f;
	imm = (short)insn;
	lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);

	if ((unsigned long)lwa_addr & 0x3) {
		do_unaligned_access(regs, address);
		return;
	}

	if (get_user(value, lwa_addr)) {
		if (user_mode(regs)) {
			force_sig(SIGSEGV);
			return;
		}

		if ((entry = search_exception_tables(orig_pc))) {
			regs->pc = entry->fixup;
			return;
		}

		/* kernel access in kernel space, load it directly */
		value = *((unsigned long *)lwa_addr);
	}

	lwa_flag = 1;
	regs->gpr[rd] = value;
}