static inline void adjust_pc()

in kernel/traps.c [288:334]

• 43 lines of code
• 10 McCabe index (conditional complexity)

static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
{
	int displacement;
	unsigned int rb, op, jmp;

	if (unlikely(in_delay_slot(regs))) {
		/* In delay slot, instruction at pc is a branch, simulate it */
		jmp = *((unsigned int *)regs->pc);

		displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
		rb = (jmp & 0x0000ffff) >> 11;
		op = jmp >> 26;

		switch (op) {
		case 0x00: /* l.j */
			regs->pc += displacement;
			return;
		case 0x01: /* l.jal */
			regs->pc += displacement;
			regs->gpr[9] = regs->pc + 8;
			return;
		case 0x03: /* l.bnf */
			if (regs->sr & SPR_SR_F)
				regs->pc += 8;
			else
				regs->pc += displacement;
			return;
		case 0x04: /* l.bf */
			if (regs->sr & SPR_SR_F)
				regs->pc += displacement;
			else
				regs->pc += 8;
			return;
		case 0x11: /* l.jr */
			regs->pc = regs->gpr[rb];
			return;
		case 0x12: /* l.jalr */
			regs->pc = regs->gpr[rb];
			regs->gpr[9] = regs->pc + 8;
			return;
		default:
			break;
		}
	} else {
		regs->pc += 4;
	}
}