static int genregs_set()

in kernel/ptrace.c [47:88]

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

static int genregs_set(struct task_struct *target,
		       const struct user_regset *regset,
		       unsigned int pos, unsigned int count,
		       const void *kbuf, const void __user *ubuf)
{
	struct pt_regs *regs = task_pt_regs(target);
	const struct switch_stack *sw = (struct switch_stack *)regs - 1;
	int ret = 0;

#define REG_IGNORE_RANGE(START, END)		\
	if (!ret)					\
		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
			START * 4, (END * 4) + 4);

#define REG_IN_ONE(PTR, LOC)	\
	if (!ret)			\
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
			(void *)(PTR), LOC * 4, (LOC * 4) + 4);

#define REG_IN_RANGE(PTR, START, END)	\
	if (!ret)				\
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
			(void *)(PTR), START * 4, (END * 4) + 4);

	REG_IGNORE_RANGE(PTR_R0, PTR_R0);
	REG_IN_RANGE(&regs->r1, PTR_R1, PTR_R7);
	REG_IN_RANGE(&regs->r8, PTR_R8, PTR_R15);
	REG_IN_RANGE(sw, PTR_R16, PTR_R23);
	REG_IGNORE_RANGE(PTR_R24, PTR_R25); /* et and bt */
	REG_IN_ONE(&regs->gp, PTR_GP);
	REG_IN_ONE(&regs->sp, PTR_SP);
	REG_IN_ONE(&regs->fp, PTR_FP);
	REG_IN_ONE(&regs->ea, PTR_EA);
	REG_IGNORE_RANGE(PTR_BA, PTR_BA);
	REG_IN_ONE(&regs->ra, PTR_RA);
	REG_IN_ONE(&regs->ea, PTR_PC); /* use ea for PC */
	if (!ret)
		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
					 PTR_STATUS * 4, -1);

	return ret;
}