static inline int rt_restore_ucontext()

in kernel/signal.c [37:99]

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

static inline int rt_restore_ucontext(struct pt_regs *regs,
					struct switch_stack *sw,
					struct ucontext *uc, int *pr2)
{
	int temp;
	unsigned long *gregs = uc->uc_mcontext.gregs;
	int err;

	/* Always make any pending restarted system calls return -EINTR */
	current->restart_block.fn = do_no_restart_syscall;

	err = __get_user(temp, &uc->uc_mcontext.version);
	if (temp != MCONTEXT_VERSION)
		goto badframe;
	/* restore passed registers */
	err |= __get_user(regs->r1, &gregs[0]);
	err |= __get_user(regs->r2, &gregs[1]);
	err |= __get_user(regs->r3, &gregs[2]);
	err |= __get_user(regs->r4, &gregs[3]);
	err |= __get_user(regs->r5, &gregs[4]);
	err |= __get_user(regs->r6, &gregs[5]);
	err |= __get_user(regs->r7, &gregs[6]);
	err |= __get_user(regs->r8, &gregs[7]);
	err |= __get_user(regs->r9, &gregs[8]);
	err |= __get_user(regs->r10, &gregs[9]);
	err |= __get_user(regs->r11, &gregs[10]);
	err |= __get_user(regs->r12, &gregs[11]);
	err |= __get_user(regs->r13, &gregs[12]);
	err |= __get_user(regs->r14, &gregs[13]);
	err |= __get_user(regs->r15, &gregs[14]);
	err |= __get_user(sw->r16, &gregs[15]);
	err |= __get_user(sw->r17, &gregs[16]);
	err |= __get_user(sw->r18, &gregs[17]);
	err |= __get_user(sw->r19, &gregs[18]);
	err |= __get_user(sw->r20, &gregs[19]);
	err |= __get_user(sw->r21, &gregs[20]);
	err |= __get_user(sw->r22, &gregs[21]);
	err |= __get_user(sw->r23, &gregs[22]);
	/* gregs[23] is handled below */
	err |= __get_user(sw->fp, &gregs[24]);  /* Verify, should this be
							settable */
	err |= __get_user(sw->gp, &gregs[25]);  /* Verify, should this be
							settable */

	err |= __get_user(temp, &gregs[26]);  /* Not really necessary no user
							settable bits */
	err |= __get_user(regs->ea, &gregs[27]);

	err |= __get_user(regs->ra, &gregs[23]);
	err |= __get_user(regs->sp, &gregs[28]);

	regs->orig_r2 = -1;		/* disable syscall checks */

	err |= restore_altstack(&uc->uc_stack);
	if (err)
		goto badframe;

	*pr2 = regs->r2;
	return err;

badframe:
	return 1;
}