void syscall_handler_tt(int sig, struct pt_regs *regs)
{
void *sc;
long result;
int syscall;
#ifdef CONFIG_SYSCALL_DEBUG
int index;
index = record_syscall_start(syscall);
#endif
sc = UPT_SC(®s->regs);
SC_START_SYSCALL(sc);
syscall_trace(®s->regs, 0);
current->thread.nsyscalls++;
nsyscalls++;
syscall = UPT_SYSCALL_NR(®s->regs);
if((syscall >= NR_syscalls) || (syscall < 0))
result = -ENOSYS;
else result = EXECUTE_SYSCALL(syscall, regs);
/* regs->sc may have changed while the system call ran (there may
* have been an interrupt or segfault), so it needs to be refreshed.
*/
UPT_SC(®s->regs) = sc;
SC_SET_SYSCALL_RETURN(sc, result);
syscall_trace(®s->regs, 1);
#ifdef CONFIG_SYSCALL_DEBUG
record_syscall_end(index, result);
#endif
}
void handle_syscall(struct uml_pt_regs *r)
{
struct pt_regs *regs = container_of(r, struct pt_regs, regs);
long result;
int syscall;
syscall_trace(r, 0);
/*
* This should go in the declaration of syscall, but when I do that,
* strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing
* children at all, sometimes hanging when bash doesn't see the first
* ls exit.
* The assembly looks functionally the same to me. This is
* gcc version 4.0.1 20050727 (Red Hat 4.0.1-5)
* in case it's a compiler bug.
*/
syscall = UPT_SYSCALL_NR(r);
if ((syscall >= NR_SYSCALLS) || (syscall < 0))
result = -ENOSYS;
else result = EXECUTE_SYSCALL(syscall, regs);
REGS_SET_SYSCALL_RETURN(r->gp, result);
syscall_trace(r, 1);
}
void handle_syscall(union uml_pt_regs *regs)
{
long result;
int index;
index = record_syscall_start(UPT_SYSCALL_NR(regs));
syscall_trace();
result = execute_syscall(regs);
REGS_SET_SYSCALL_RETURN(regs->skas.regs, result);
if((result == -ERESTARTNOHAND) || (result == -ERESTARTSYS) ||
(result == -ERESTARTNOINTR))
do_signal(result);
syscall_trace();
record_syscall_end(index, result);
}
void handle_syscall(union uml_pt_regs *regs)
{
long result;
#ifdef UML_CONFIG_SYSCALL_DEBUG
int index;
index = record_syscall_start(UPT_SYSCALL_NR(regs));
#endif
syscall_trace(regs, 0);
result = execute_syscall_skas(regs);
REGS_SET_SYSCALL_RETURN(regs->skas.regs, result);
syscall_trace(regs, 1);
#ifdef UML_CONFIG_SYSCALL_DEBUG
record_syscall_end(index, result);
#endif
}
void do_sys(struct pt_regs *regs)
{
unsigned long syscallnr, usp;
syscall_t syscall;
int errno, narg;
/*
* Compute the return address;
*/
if (regs->cp0_cause & CAUSEF_BD)
{
/*
* This syscall is in a branch delay slot. Since we don't do
* branch delay slot handling we would get a process trying
* to do syscalls ever and ever again. So better zap it.
*/
printk("%s: syscall in branch delay slot.\n", current->comm);
current->sig->action[SIGILL-1].sa_handler = NULL;
current->blocked &= ~(1<<(SIGILL-1));
send_sig(SIGILL, current, 1);
return;
}
regs->cp0_epc += 4;
syscallnr = regs->reg2;
if (syscallnr > (__NR_Linux + __NR_Linux_syscalls))
goto illegal_syscall;
syscall = sys_call_table[syscallnr];
if (syscall == NULL)
goto illegal_syscall;
narg = sys_narg_table[syscallnr];
if (narg > 4)
{
/*
* Verify that we can safely get the additional parameters
* from the user stack. Of course I could read the params
* from unaligned addresses ... Consider this a programming
* course caliber .45.
*/
usp = regs->reg29;
if (usp & 3)
{
printk("unaligned usp\n");
send_sig(SIGSEGV, current, 1);
regs->reg2 = EFAULT;
regs->reg7 = 1;
return;
}
errno = verify_area(VERIFY_READ, (void *) (usp + 16),
(narg - 4) * sizeof(unsigned long));
if (errno < 0)
goto bad_syscall;
}
if ((current->flags & PF_TRACESYS) == 0)
{
errno = do_syscalls(regs, syscall, narg);
if (errno < 0 || current->errno)
goto bad_syscall;
regs->reg2 = errno;
regs->reg7 = 0;
}
else
{
syscall_trace();
errno = do_syscalls(regs, syscall, narg);
if (errno < 0 || current->errno)
{
regs->reg2 = -errno;
regs->reg7 = 1;
}
else
{
regs->reg2 = errno;
regs->reg7 = 0;
}
syscall_trace();
}
return;
bad_syscall:
regs->reg2 = -errno;
regs->reg7 = 1;
return;
illegal_syscall:
regs->reg2 = ENOSYS;
regs->reg7 = 1;
return;
}
asmlinkage void
irix_sigreturn(struct pt_regs *regs)
{
struct sigctx_irix5 *context, *magic;
unsigned long umask, mask;
u64 *fregs;
int sig, i, base = 0;
sigset_t blocked;
if(regs->regs[2] == 1000)
base = 1;
context = (struct sigctx_irix5 *) regs->regs[base + 4];
magic = (struct sigctx_irix5 *) regs->regs[base + 5];
sig = (int) regs->regs[base + 6];
#ifdef DEBUG_SIG
printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
current->comm, current->pid, context, magic, sig);
#endif
if (!context)
context = magic;
if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
goto badframe;
#ifdef DEBUG_SIG
dump_irix5_sigctx(context);
#endif
__get_user(regs->cp0_epc, &context->pc);
umask = context->rmask; mask = 2;
for (i = 1; i < 32; i++, mask <<= 1) {
if(umask & mask)
__get_user(regs->regs[i], &context->regs[i]);
}
__get_user(regs->hi, &context->hi);
__get_user(regs->lo, &context->lo);
if ((umask & 1) && context->usedfp) {
fregs = (u64 *) ¤t->thread.fpu;
for(i = 0; i < 32; i++)
fregs[i] = (u64) context->fpregs[i];
__get_user(current->thread.fpu.hard.control, &context->fpcsr);
}
/* XXX do sigstack crapola here... XXX */
if (__copy_from_user(&blocked, &context->sigset, sizeof(blocked)))
goto badframe;
sigdelsetmask(&blocked, ~_BLOCKABLE);
spin_lock_irq(¤t->sigmask_lock);
current->blocked = blocked;
recalc_sigpending(current);
spin_unlock_irq(¤t->sigmask_lock);
/*
* Don't let your children do this ...
*/
if (current->ptrace & PT_TRACESYS)
syscall_trace();
__asm__ __volatile__(
"move\t$29,%0\n\t"
"j\tret_from_sys_call"
:/* no outputs */
:"r" (®s));
/* Unreached */
badframe:
force_sig(SIGSEGV, current);
}