static int genregs_set()

in kernel/ptrace.c [78:155]

• 67 lines of code
• 4 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)
{
	const struct pt_regs *ptregs = task_pt_regs(target);
	const struct callee_regs *cregs = task_callee_regs(target);
	int ret = 0;

#define REG_IN_CHUNK(FIRST, NEXT, PTR)	\
	if (!ret)			\
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
			(void *)(PTR), \
			offsetof(struct user_regs_struct, FIRST), \
			offsetof(struct user_regs_struct, NEXT));

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

#define REG_IGNORE_ONE(LOC)		\
	if (!ret)			\
		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \
			offsetof(struct user_regs_struct, LOC), \
			offsetof(struct user_regs_struct, LOC) + 4);

	REG_IGNORE_ONE(pad);

	REG_IN_ONE(scratch.bta, &ptregs->bta);
	REG_IN_ONE(scratch.lp_start, &ptregs->lp_start);
	REG_IN_ONE(scratch.lp_end, &ptregs->lp_end);
	REG_IN_ONE(scratch.lp_count, &ptregs->lp_count);

	REG_IGNORE_ONE(scratch.status32);

	REG_IN_ONE(scratch.ret, &ptregs->ret);
	REG_IN_ONE(scratch.blink, &ptregs->blink);
	REG_IN_ONE(scratch.fp, &ptregs->fp);
	REG_IN_ONE(scratch.gp, &ptregs->r26);
	REG_IN_ONE(scratch.r12, &ptregs->r12);
	REG_IN_ONE(scratch.r11, &ptregs->r11);
	REG_IN_ONE(scratch.r10, &ptregs->r10);
	REG_IN_ONE(scratch.r9, &ptregs->r9);
	REG_IN_ONE(scratch.r8, &ptregs->r8);
	REG_IN_ONE(scratch.r7, &ptregs->r7);
	REG_IN_ONE(scratch.r6, &ptregs->r6);
	REG_IN_ONE(scratch.r5, &ptregs->r5);
	REG_IN_ONE(scratch.r4, &ptregs->r4);
	REG_IN_ONE(scratch.r3, &ptregs->r3);
	REG_IN_ONE(scratch.r2, &ptregs->r2);
	REG_IN_ONE(scratch.r1, &ptregs->r1);
	REG_IN_ONE(scratch.r0, &ptregs->r0);
	REG_IN_ONE(scratch.sp, &ptregs->sp);

	REG_IGNORE_ONE(pad2);

	REG_IN_ONE(callee.r25, &cregs->r25);
	REG_IN_ONE(callee.r24, &cregs->r24);
	REG_IN_ONE(callee.r23, &cregs->r23);
	REG_IN_ONE(callee.r22, &cregs->r22);
	REG_IN_ONE(callee.r21, &cregs->r21);
	REG_IN_ONE(callee.r20, &cregs->r20);
	REG_IN_ONE(callee.r19, &cregs->r19);
	REG_IN_ONE(callee.r18, &cregs->r18);
	REG_IN_ONE(callee.r17, &cregs->r17);
	REG_IN_ONE(callee.r16, &cregs->r16);
	REG_IN_ONE(callee.r15, &cregs->r15);
	REG_IN_ONE(callee.r14, &cregs->r14);
	REG_IN_ONE(callee.r13, &cregs->r13);

	REG_IGNORE_ONE(efa);			/* efa update invalid */
	REG_IGNORE_ONE(stop_pc);		/* PC updated via @ret */

	return ret;
}