lkml.org 
[lkml]   [2011]   [Feb]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCHv2 11/11] unicore32 core architecture: signals handling
On Sun, Feb 13, 2011 at 02:42:00PM +0800, Guan Xuetao wrote:
> This patch implements signals.

> +static int restore_sigframe(struct pt_regs *regs, struct sigframe __user *sf)
> +{
> + sigset_t set;
> + int err;
> +
> + err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
> + if (err == 0) {
> + sigdelsetmask(&set, ~_BLOCKABLE);
> + spin_lock_irq(&current->sighand->siglock);
> + current->blocked = set;
> + recalc_sigpending();
> + spin_unlock_irq(&current->sighand->siglock);
> + }
> +
> + err |= __get_user(regs->UCreg_00, &sf->uc.uc_mcontext.regs.UCreg_00);
> + err |= __get_user(regs->UCreg_01, &sf->uc.uc_mcontext.regs.UCreg_01);
> + err |= __get_user(regs->UCreg_02, &sf->uc.uc_mcontext.regs.UCreg_02);
> + err |= __get_user(regs->UCreg_03, &sf->uc.uc_mcontext.regs.UCreg_03);
> + err |= __get_user(regs->UCreg_04, &sf->uc.uc_mcontext.regs.UCreg_04);
> + err |= __get_user(regs->UCreg_05, &sf->uc.uc_mcontext.regs.UCreg_05);
> + err |= __get_user(regs->UCreg_06, &sf->uc.uc_mcontext.regs.UCreg_06);
> + err |= __get_user(regs->UCreg_07, &sf->uc.uc_mcontext.regs.UCreg_07);
> + err |= __get_user(regs->UCreg_08, &sf->uc.uc_mcontext.regs.UCreg_08);
> + err |= __get_user(regs->UCreg_09, &sf->uc.uc_mcontext.regs.UCreg_09);
> + err |= __get_user(regs->UCreg_10, &sf->uc.uc_mcontext.regs.UCreg_10);
> + err |= __get_user(regs->UCreg_11, &sf->uc.uc_mcontext.regs.UCreg_11);
> + err |= __get_user(regs->UCreg_12, &sf->uc.uc_mcontext.regs.UCreg_12);
> + err |= __get_user(regs->UCreg_13, &sf->uc.uc_mcontext.regs.UCreg_13);
> + err |= __get_user(regs->UCreg_14, &sf->uc.uc_mcontext.regs.UCreg_14);
> + err |= __get_user(regs->UCreg_15, &sf->uc.uc_mcontext.regs.UCreg_15);
> + err |= __get_user(regs->UCreg_16, &sf->uc.uc_mcontext.regs.UCreg_16);
> + err |= __get_user(regs->UCreg_17, &sf->uc.uc_mcontext.regs.UCreg_17);
> + err |= __get_user(regs->UCreg_18, &sf->uc.uc_mcontext.regs.UCreg_18);
> + err |= __get_user(regs->UCreg_19, &sf->uc.uc_mcontext.regs.UCreg_19);
> + err |= __get_user(regs->UCreg_20, &sf->uc.uc_mcontext.regs.UCreg_20);
> + err |= __get_user(regs->UCreg_21, &sf->uc.uc_mcontext.regs.UCreg_21);
> + err |= __get_user(regs->UCreg_22, &sf->uc.uc_mcontext.regs.UCreg_22);
> + err |= __get_user(regs->UCreg_23, &sf->uc.uc_mcontext.regs.UCreg_23);
> + err |= __get_user(regs->UCreg_24, &sf->uc.uc_mcontext.regs.UCreg_24);
> + err |= __get_user(regs->UCreg_25, &sf->uc.uc_mcontext.regs.UCreg_25);
> + err |= __get_user(regs->UCreg_26, &sf->uc.uc_mcontext.regs.UCreg_26);
> + err |= __get_user(regs->UCreg_fp, &sf->uc.uc_mcontext.regs.UCreg_fp);
> + err |= __get_user(regs->UCreg_ip, &sf->uc.uc_mcontext.regs.UCreg_ip);
> + err |= __get_user(regs->UCreg_sp, &sf->uc.uc_mcontext.regs.UCreg_sp);
> + err |= __get_user(regs->UCreg_lr, &sf->uc.uc_mcontext.regs.UCreg_lr);
> + err |= __get_user(regs->UCreg_pc, &sf->uc.uc_mcontext.regs.UCreg_pc);
> + err |= __get_user(regs->UCreg_asr, &sf->uc.uc_mcontext.regs.UCreg_asr);
> +
> + err |= !valid_user_regs(regs);

a) where is valid_user_regs() defined?

b) assuming it's not always returning true (and it'd better, or you'll be able
to do interesting things with asr here), can it fail on frame setup path?
And what do you do if it *does* fail there and resulting SIGSEGV is caught and
handled?


\
 
 \ /
  Last update: 2011-02-13 17:11    [W:0.049 / U:0.264 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site