static void
setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, struct exregs_regs *regs)
{
struct sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
unsigned long handler = (unsigned long)ka->sa.sa_handler;
int err = 0;
printk_dbg("%s called\n", __func__);
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto badframe;
err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]);
if (_NSIG_WORDS > 1) {
err |= __copy_to_user(frame->extramask, &set->sig[1],
sizeof(frame->extramask));
}
err |= __put_user(handler, &frame->sig_ip);
printk_dbg("%s frame->sig_ip = %lx\n", __func__, handler);
if (!err)
err = setup_return(regs, ka, &frame->retcode, frame,
&frame->lr, &frame->usig, usig);
if (err)
goto badframe;
regs->ip = TASK_SIG_BASE;
switch (regs->syscall_action)
{
case 1: /* Syscall */
regs->ip += ((unsigned long)&__wombat_user_sigentry) & ~PAGE_MASK;
break;
case 0: /* Fault */
case 2: /* Restart syscall */
regs->ip += ((unsigned long)&__wombat_user_sigentry_restart) & ~PAGE_MASK;
break;
case 4: /* Interrupt syscall */
regs->ip += ((unsigned long)&__wombat_user_sigentry_int) & ~PAGE_MASK;
break;
default:
BUG();
}
set_need_restart(current_thread_info(), regs->ip,
regs->sp, regs->flags);
printk_dbg("SIG deliver (%s:%d:%lx): sp=%p pc=%p\n",
current->comm, current->pid,
current_thread_info()->user_tid.raw,
frame, (void*)regs->ip);
return;
badframe:
force_sigsegv(usig, current);
return;
}
asmlinkage int
sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, struct pt_regs *regs)
{
sigset_t saveset, newset;
printk_dbg("XXX - %s() called\n", __func__);
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
return -EINVAL;
if (copy_from_user(&newset, unewset, sizeof(newset)))
return -EFAULT;
sigdelsetmask(&newset, ~_BLOCKABLE);
spin_lock_irq(¤t->sighand->siglock);
saveset = current->blocked;
current->blocked = newset;
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
ARM_put_r0(regs, -ERESTART_RESTARTBLOCK);
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (l4_do_signal(&saveset, regs, 1))
return ARM_r0(regs);
}
}
asmlinkage int
sys_sigaction(int sig, const struct old_sigaction *act,
struct old_sigaction *oact)
{
struct k_sigaction new_ka, old_ka;
int ret;
printk_dbg("XXX - %s() called\n", __func__);
if (act) {
old_sigset_t mask;
if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
return -EFAULT;
__get_user(new_ka.sa.sa_flags, &act->sa_flags);
__get_user(mask, &act->sa_mask);
siginitset(&new_ka.sa.sa_mask, mask);
}
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
return -EFAULT;
__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
}
return ret;
}
static int
restore_sigcontext(struct sigcontext *sc)
{
int err = 0;
struct exregs_regs regs;
struct restore_sigframe __user *restore;
printk_dbg("%s called\n", __func__);
/* User registers are saved/restored in user.S (__wombat_user_xxx) */
__get_user_error(regs.sp, &sc->arm_sp, err);
__get_user_error(regs.ip, &sc->arm_pc, err);
__get_user_error(regs.flags, &sc->arm_cpsr, err);
restore = (void*)(regs.sp - sizeof(struct restore_sigframe));
__put_user_error(regs.ip, &restore->ret_ip, err);
if (!err) {
set_need_restart(current_thread_info(),
(unsigned long)TASK_SIG_BASE +
(((unsigned long)&__wombat_user_sigrestore) & ~PAGE_MASK),
(unsigned long)sc, regs.flags);
L4_Stop_Thread(current_thread_info()->user_tid);
set_user_ipc_cancelled(current_thread_info());
}
return err;
}
static inline void *
get_sigframe(struct k_sigaction *ka, struct exregs_regs *regs, int framesize)
{
unsigned long sp = regs->sp;
printk_dbg("%s called\n", __func__);
/*
* This is the X/Open sanctioned signal stack switching.
*/
if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp))
sp = current->sas_ss_sp + current->sas_ss_size;
/*
* ATPCS B01 mandates 8-byte alignment
*/
return (void *)((sp - framesize) & ~7);
}
asmlinkage int sys_sigreturn(struct pt_regs *regs)
{
struct sigframe *frame;
sigset_t set;
printk_dbg("XXX - %s() called\n", __func__);
/* Always make any pending restarted system calls return -EINTR */
current_thread_info()->restart_block.fn = do_no_restart_syscall;
/*
* Since we stacked the signal on a 64-bit boundary,
* then 'sp' should be word aligned here. If it's
* not, then the user is trying to mess with us.
*/
if (ARM_sp(regs) & 7)
goto badframe;
frame = (struct sigframe *)ARM_sp(regs);
if (verify_area(VERIFY_READ, frame, sizeof (*frame)))
goto badframe;
if (__get_user(set.sig[0], &frame->sc.oldmask)
|| (_NSIG_WORDS > 1
&& __copy_from_user(&set.sig[1], &frame->extramask,
sizeof(frame->extramask))))
goto badframe;
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(¤t->sighand->siglock);
current->blocked = set;
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
if (restore_sigcontext(&frame->sc))
goto badframe;
return ARM_r0(regs);
badframe:
force_sig(SIGSEGV, current);
return 0;
}
/*
* atomically swap in the new signal mask, and wait for a signal.
*/
asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask, struct pt_regs *regs)
{
sigset_t saveset;
printk_dbg("XXX - %s() called\n", __func__);
mask &= _BLOCKABLE;
spin_lock_irq(¤t->sighand->siglock);
saveset = current->blocked;
siginitset(¤t->blocked, mask);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
ARM_put_r0(regs, -ERESTART_RESTARTBLOCK);
while (1) {
current->state = TASK_INTERRUPTIBLE;
schedule();
if (l4_do_signal(&saveset, regs, 1))
return ARM_r0(regs);
}
}
void l4_arch_setup_frame(int signr, struct k_sigaction * ka, siginfo_t *info,
sigset_t *set, struct exregs_regs *regs)
{
struct thread_info *thread = current_thread_info();
int usig = signr;
/*
* translate the signal
*/
if (usig < 32 && thread->exec_domain && thread->exec_domain->signal_invmap)
usig = thread->exec_domain->signal_invmap[usig];
printk_dbg("%s %d\n", __func__, usig);
if (regs->syscall_action == 2) /* restart syscall */
regs->ip -= 4;
/*
* Set up the stack frame
*/
if (ka->sa.sa_flags & SA_SIGINFO)
setup_rt_frame(usig, ka, info, set, regs);
else
setup_frame(usig, ka, set, regs);
}
/*
* subbuf_splice_actor - splice up to one subbuf's worth of data
*/
static int subbuf_splice_actor(struct file *in,
loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len,
unsigned int flags,
struct lib_ring_buffer *buf)
{
struct channel *chan = buf->backend.chan;
const struct lib_ring_buffer_config *config = &chan->backend.config;
unsigned int poff, subbuf_pages, nr_pages;
struct page *pages[PIPE_DEF_BUFFERS];
struct partial_page partial[PIPE_DEF_BUFFERS];
struct splice_pipe_desc spd = {
.pages = pages,
.nr_pages = 0,
.partial = partial,
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4,12,0))
.flags = flags,
#endif
.ops = &ring_buffer_pipe_buf_ops,
.spd_release = lib_ring_buffer_page_release,
};
unsigned long consumed_old, roffset;
unsigned long bytes_avail;
/*
* Check that a GET_SUBBUF ioctl has been done before.
*/
WARN_ON(atomic_long_read(&buf->active_readers) != 1);
consumed_old = lib_ring_buffer_get_consumed(config, buf);
consumed_old += *ppos;
/*
* Adjust read len, if longer than what is available.
* Max read size is 1 subbuffer due to get_subbuf/put_subbuf for
* protection.
*/
bytes_avail = chan->backend.subbuf_size;
WARN_ON(bytes_avail > chan->backend.buf_size);
len = min_t(size_t, len, bytes_avail);
subbuf_pages = bytes_avail >> PAGE_SHIFT;
nr_pages = min_t(unsigned int, subbuf_pages, PIPE_DEF_BUFFERS);
roffset = consumed_old & PAGE_MASK;
poff = consumed_old & ~PAGE_MASK;
printk_dbg(KERN_DEBUG "SPLICE actor len %zu pos %zd write_pos %ld\n",
len, (ssize_t)*ppos, lib_ring_buffer_get_offset(config, buf));
for (; spd.nr_pages < nr_pages; spd.nr_pages++) {
unsigned int this_len;
unsigned long *pfnp, new_pfn;
struct page *new_page;
void **virt;
if (!len)
break;
printk_dbg(KERN_DEBUG "SPLICE actor loop len %zu roffset %ld\n",
len, roffset);
/*
* We have to replace the page we are moving into the splice
* pipe.
*/
new_page = alloc_pages_node(cpu_to_node(max(buf->backend.cpu,
0)),
GFP_KERNEL | __GFP_ZERO, 0);
if (!new_page)
break;
new_pfn = page_to_pfn(new_page);
this_len = PAGE_SIZE - poff;
pfnp = lib_ring_buffer_read_get_pfn(&buf->backend, roffset, &virt);
spd.pages[spd.nr_pages] = pfn_to_page(*pfnp);
*pfnp = new_pfn;
*virt = page_address(new_page);
spd.partial[spd.nr_pages].offset = poff;
spd.partial[spd.nr_pages].len = this_len;
poff = 0;
roffset += PAGE_SIZE;
len -= this_len;
}
if (!spd.nr_pages)
return 0;
return wrapper_splice_to_pipe(pipe, &spd);
}
ssize_t lib_ring_buffer_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags,
struct lib_ring_buffer *buf)
{
struct channel *chan = buf->backend.chan;
const struct lib_ring_buffer_config *config = &chan->backend.config;
ssize_t spliced;
int ret;
if (config->output != RING_BUFFER_SPLICE)
return -EINVAL;
/*
* We require ppos and length to be page-aligned for performance reasons
* (no page copy). Size is known using the ioctl
* RING_BUFFER_GET_PADDED_SUBBUF_SIZE, which is page-size padded.
* We fail when the ppos or len passed is not page-sized, because splice
* is not allowed to copy more than the length passed as parameter (so
* the ABI does not let us silently copy more than requested to include
* padding).
*/
if (*ppos != PAGE_ALIGN(*ppos) || len != PAGE_ALIGN(len))
return -EINVAL;
ret = 0;
spliced = 0;
printk_dbg(KERN_DEBUG "SPLICE read len %zu pos %zd\n", len,
(ssize_t)*ppos);
while (len && !spliced) {
ret = subbuf_splice_actor(in, ppos, pipe, len, flags, buf);
printk_dbg(KERN_DEBUG "SPLICE read loop ret %d\n", ret);
if (ret < 0)
break;
else if (!ret) {
if (flags & SPLICE_F_NONBLOCK)
ret = -EAGAIN;
break;
}
*ppos += ret;
if (ret > len)
len = 0;
else
len -= ret;
spliced += ret;
}
if (spliced)
return spliced;
return ret;
}
EXPORT_SYMBOL_GPL(lib_ring_buffer_splice_read);
ssize_t vfs_lib_ring_buffer_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags)
{
struct lib_ring_buffer *buf = in->private_data;
return lib_ring_buffer_splice_read(in, ppos, pipe, len, flags, buf);
}
EXPORT_SYMBOL_GPL(vfs_lib_ring_buffer_splice_read);
asmlinkage int
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, struct pt_regs *regs)
{
printk_dbg("XXX - %s() called\n", __func__);
return do_sigaltstack(uss, uoss, ARM_sp(regs));
}
static void
setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct exregs_regs *regs)
{
struct rt_sigframe *frame = get_sigframe(ka, regs, sizeof(*frame));
unsigned long handler = (unsigned long)ka->sa.sa_handler;
int err = 0;
printk_dbg("%s called\n", __func__);
if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
goto badframe;
__put_user_error(&frame->info, &frame->pinfo, err);
__put_user_error(&frame->uc, &frame->puc, err);
err |= copy_siginfo_to_user(&frame->info, info);
/* Clear all the bits of the ucontext we don't use. */
err |= clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
err |= setup_sigcontext(&frame->uc.uc_mcontext, /*&frame->fpstate,*/
regs, set->sig[0]);
err |= copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
err |= __put_user(handler, &frame->sig_ip);
printk_dbg("%s frame->sig_ip = %lx\n", __func__, handler);
if (!err)
err = setup_return(regs, ka, &frame->retcode, frame,
&frame->lr, &frame->usig, usig);
if (!err) {
/*
* For realtime signals we must also set the second and third
* arguments for the signal handler.
* -- Peter Maydell <*****@*****.**> 2000-12-06
*/
// ARM_put_r1(regs, (unsigned long)frame->pinfo);
// ARM_put_r2(regs, (unsigned long)frame->puc);
}
if (err)
goto badframe;
regs->ip = TASK_SIG_BASE;
switch (regs->syscall_action)
{
case 1: /* Syscall */
regs->ip += ((unsigned long)&__wombat_user_rt_sigentry) & ~PAGE_MASK;
break;
case 0: /* Fault */
case 2: /* Restart syscall */
regs->ip += ((unsigned long)&__wombat_user_rt_sigentry_restart) & ~PAGE_MASK;
break;
case 4: /* Interrupt syscall */
regs->ip += ((unsigned long)&__wombat_user_rt_sigentry_int) & ~PAGE_MASK;
break;
default:
BUG();
}
set_need_restart(current_thread_info(), regs->ip,
regs->sp, regs->flags);
printk_dbg("SIG rt deliver (%s:%d:%lx): sp=%p pc=%p\n",
current->comm, current->pid,
current_thread_info()->user_tid.raw,
frame, (void*)regs->ip);
return;
badframe:
force_sigsegv(usig, current);
return;
}
static int
setup_return(struct exregs_regs *regs, struct k_sigaction *ka,
unsigned long __user *rc, void __user *frame,
unsigned long __user *lr, int __user *sig,
int usig)
{
unsigned long retcode;
int thumb = 0;
unsigned long cpsr = regs->flags & ~PSR_f;
unsigned long handler = (unsigned long)ka->sa.sa_handler;
/*
* Maybe we need to deliver a 32-bit signal to a 26-bit task.
*/
if (ka->sa.sa_flags & SA_THIRTYTWO)
cpsr = (cpsr & ~MODE_MASK) | USR_MODE;
/* Thumb mode tests */
/*
* The LSB of the handler determines if we're going to
* be using THUMB or ARM mode for this signal handler.
*/
thumb = handler & 1;
if (thumb)
cpsr |= PSR_T_BIT;
else
cpsr &= ~PSR_T_BIT;
if (thumb)
{
printk("%d: Thumb mode handlers not suppoted\n", current->pid);
return 1;
}
if (ka->sa.sa_flags & SA_RESTORER) {
retcode = (unsigned long)ka->sa.sa_restorer;
} else {
unsigned int idx = thumb << 1;
if (ka->sa.sa_flags & SA_SIGINFO)
idx += 3;
if (__put_user(sigreturn_codes[idx], rc) ||
__put_user(sigreturn_codes[idx+1], rc+1))
return 1;
/*
* Ensure that the instruction cache sees
* the return code written onto the stack.
*/
flush_icache_range((unsigned long)rc,
(unsigned long)(rc + 1));
retcode = ((unsigned long)rc) + thumb;
}
if (__put_user(usig, sig))
return 1;
if (__put_user(retcode, lr))
return 1;
printk_dbg("%s %d restorer = %lx, frame = %p\n", __func__, __LINE__, retcode, frame);
regs->sp = (unsigned long)frame;
regs->flags = cpsr;
// ARM_put_r0(regs, usig);
// ARM_put_lr(regs, retcode);
return 0;
}