static Addr build_sigframe(ThreadState *tst,
Addr sp_top_of_frame,
const vki_siginfo_t *siginfo,
const struct vki_ucontext *siguc,
UInt flags,
const vki_sigset_t *mask,
void *restorer)
{
struct sigframe *frame;
Addr sp = sp_top_of_frame;
vg_assert((flags & VKI_SA_SIGINFO) == 0);
vg_assert((sizeof(*frame) & 7) == 0);
vg_assert((sp & 7) == 0);
sp -= sizeof(*frame);
frame = (struct sigframe *)sp;
if (! ML_(sf_maybe_extend_stack)(tst, sp, sizeof(*frame), flags))
return sp_top_of_frame;
/* retcode, sigNo, sc, sregs fields are to be written */
VG_TRACK( pre_mem_write, Vg_CoreSignal, tst->tid, "signal handler frame",
sp, offsetof(struct sigframe, vg) );
save_sigregs(tst, &frame->sregs);
frame->sigNo = siginfo->si_signo;
frame->sc.sregs = &frame->sregs;
VG_(memcpy)(frame->sc.oldmask, mask->sig, sizeof(frame->sc.oldmask));
if (flags & VKI_SA_RESTORER) {
SET_SIGNAL_GPR(tst, 14, restorer);
} else {
frame->retcode[0] = 0x0a;
frame->retcode[1] = __NR_sigreturn;
/* This normally should be &frame->recode. but since there
might be problems with non-exec stack and we must discard
the translation for the on-stack sigreturn we just use the
trampoline like x86,ppc. We still fill in the retcode, lets
just hope that nobody actually jumps here */
SET_SIGNAL_GPR(tst, 14, (Addr)&VG_(s390x_linux_SUBST_FOR_sigreturn));
}
SET_SIGNAL_GPR(tst, 2, siginfo->si_signo);
SET_SIGNAL_GPR(tst, 3, &frame->sc);
/* fixs390: we dont fill in trapno and prot_addr in r4 and r5*/
/* Set up backchain. */
*((Addr *) sp) = sp_top_of_frame;
VG_TRACK( post_mem_write, Vg_CoreSignal, tst->tid,
sp, offsetof(struct sigframe, vg) );
build_vg_sigframe(&frame->vg, tst, flags, siginfo->si_signo);
return sp;
}
static int setup_frame(int sig, struct k_sigaction *ka,
sigset_t *set, struct pt_regs * regs)
{
sigframe __user *frame;
frame = get_sigframe(ka, regs, sizeof(sigframe));
if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe)))
goto give_sigsegv;
if (frame == (void __user *) -1UL)
goto give_sigsegv;
if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE))
goto give_sigsegv;
if (save_sigregs(regs, &frame->sregs))
goto give_sigsegv;
if (__put_user(&frame->sregs, &frame->sc.sregs))
goto give_sigsegv;
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
regs->gprs[14] = (unsigned long)
ka->sa.sa_restorer | PSW_ADDR_AMODE;
} else {
regs->gprs[14] = (unsigned long)
frame->retcode | PSW_ADDR_AMODE;
if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
(u16 __user *)(frame->retcode)))
goto give_sigsegv;
}
/* Set up backchain. */
if (__put_user(regs->gprs[15], (addr_t __user *) frame))
goto give_sigsegv;
/* Set up registers for signal handler */
regs->gprs[15] = (unsigned long) frame;
regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
regs->gprs[2] = map_signal(sig);
regs->gprs[3] = (unsigned long) &frame->sc;
/* We forgot to include these in the sigcontext.
To avoid breaking binary compatibility, they are passed as args. */
regs->gprs[4] = current->thread.trap_no;
regs->gprs[5] = current->thread.prot_addr;
/* Place signal number on stack to allow backtrace from handler. */
if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
goto give_sigsegv;
return 0;
give_sigsegv:
force_sigsegv(sig, current);
return -EFAULT;
}
static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs * regs)
{
int err = 0;
rt_sigframe __user *frame;
frame = get_sigframe(ka, regs, sizeof(rt_sigframe));
if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe)))
goto give_sigsegv;
if (frame == (void __user *) -1UL)
goto give_sigsegv;
if (copy_siginfo_to_user(&frame->info, info))
goto give_sigsegv;
/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
err |= __put_user(NULL, &frame->uc.uc_link);
err |= __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
err |= __put_user(sas_ss_flags(regs->gprs[15]),
&frame->uc.uc_stack.ss_flags);
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
err |= save_sigregs(regs, &frame->uc.uc_mcontext);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
goto give_sigsegv;
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
regs->gprs[14] = (unsigned long)
ka->sa.sa_restorer | PSW_ADDR_AMODE;
} else {
regs->gprs[14] = (unsigned long)
frame->retcode | PSW_ADDR_AMODE;
if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
(u16 __user *)(frame->retcode)))
goto give_sigsegv;
}
/* Set up backchain. */
if (__put_user(regs->gprs[15], (addr_t __user *) frame))
goto give_sigsegv;
/* Set up registers for signal handler */
regs->gprs[15] = (unsigned long) frame;
regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
regs->gprs[2] = map_signal(sig);
regs->gprs[3] = (unsigned long) &frame->info;
regs->gprs[4] = (unsigned long) &frame->uc;
return 0;
give_sigsegv:
force_sigsegv(sig, current);
return -EFAULT;
}
static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs * regs)
{
int err = 0;
rt_sigframe __user *frame;
frame = get_sigframe(ka, regs, sizeof(rt_sigframe));
if (frame == (void __user *) -1UL)
goto give_sigsegv;
if (copy_siginfo_to_user(&frame->info, info))
goto give_sigsegv;
/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
err |= __put_user(NULL, &frame->uc.uc_link);
err |= __save_altstack(&frame->uc.uc_stack, regs->gprs[15]);
err |= save_sigregs(regs, &frame->uc.uc_mcontext);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
goto give_sigsegv;
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
regs->gprs[14] = (unsigned long)
ka->sa.sa_restorer | PSW_ADDR_AMODE;
} else {
regs->gprs[14] = (unsigned long)
frame->retcode | PSW_ADDR_AMODE;
if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
(u16 __user *)(frame->retcode)))
goto give_sigsegv;
}
/* Set up backchain. */
if (__put_user(regs->gprs[15], (addr_t __user *) frame))
goto give_sigsegv;
/* Set up registers for signal handler */
regs->gprs[15] = (unsigned long) frame;
/* Force default amode and default user address space control. */
regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
(PSW_USER_BITS & PSW_MASK_ASC) |
(regs->psw.mask & ~PSW_MASK_ASC);
regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
regs->gprs[2] = map_signal(sig);
regs->gprs[3] = (unsigned long) &frame->info;
regs->gprs[4] = (unsigned long) &frame->uc;
regs->gprs[5] = task_thread_info(current)->last_break;
return 0;
give_sigsegv:
force_sigsegv(sig, current);
return -EFAULT;
}
static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
sigset_t *set, struct pt_regs * regs)
{
int err = 0;
rt_sigframe *frame = get_sigframe(ka, regs, sizeof(rt_sigframe));
if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe)))
goto give_sigsegv;
if (copy_siginfo_to_user(&frame->info, info))
goto give_sigsegv;
/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
err |= __put_user(0, &frame->uc.uc_link);
err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
err |= __put_user(sas_ss_flags(regs->gprs[15]),
&frame->uc.uc_stack.ss_flags);
err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
err |= save_sigregs(regs, &frame->uc.uc_mcontext);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
goto give_sigsegv;
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
regs->gprs[14] = FIX_PSW(ka->sa.sa_restorer);
} else {
regs->gprs[14] = FIX_PSW(frame->retcode);
err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
(u16 *)(frame->retcode));
}
/* Set up backchain. */
if (__put_user(regs->gprs[15], (addr_t *) frame))
goto give_sigsegv;
/* Set up registers for signal handler */
regs->gprs[15] = (addr_t)frame;
regs->psw.addr = FIX_PSW(ka->sa.sa_handler);
regs->psw.mask = _USER_PSW_MASK;
regs->gprs[2] = map_signal(sig);
regs->gprs[3] = (addr_t)&frame->info;
regs->gprs[4] = (addr_t)&frame->uc;
return;
give_sigsegv:
if (sig == SIGSEGV)
ka->sa.sa_handler = SIG_DFL;
force_sig(SIGSEGV, current);
}
static void setup_frame(int sig, struct k_sigaction *ka,
sigset_t *set, struct pt_regs * regs)
{
sigframe *frame = get_sigframe(ka, regs, sizeof(sigframe));
if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe)))
goto give_sigsegv;
if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE))
goto give_sigsegv;
if (save_sigregs(regs, &frame->sregs))
goto give_sigsegv;
if (__put_user(&frame->sregs, &frame->sc.sregs))
goto give_sigsegv;
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
regs->gprs[14] = FIX_PSW(ka->sa.sa_restorer);
} else {
regs->gprs[14] = FIX_PSW(frame->retcode);
if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
(u16 *)(frame->retcode)))
goto give_sigsegv;
}
/* Set up backchain. */
if (__put_user(regs->gprs[15], (addr_t *) frame))
goto give_sigsegv;
/* Set up registers for signal handler */
regs->gprs[15] = (addr_t)frame;
regs->psw.addr = FIX_PSW(ka->sa.sa_handler);
regs->psw.mask = _USER_PSW_MASK;
regs->gprs[2] = map_signal(sig);
regs->gprs[3] = (addr_t)&frame->sc;
/* We forgot to include these in the sigcontext.
To avoid breaking binary compatibility, they are passed as args. */
regs->gprs[4] = current->thread.trap_no;
regs->gprs[5] = current->thread.prot_addr;
return;
give_sigsegv:
if (sig == SIGSEGV)
ka->sa.sa_handler = SIG_DFL;
force_sig(SIGSEGV, current);
}
static void *setup_frame_common(int sig, struct k_sigaction *ka,
sigset_t *set, struct pt_regs * regs,
int frame_size,u16 retcode)
{
sigframe *frame;
int err;
frame = get_sigframe(ka, regs,frame_size);
if (!access_ok(VERIFY_WRITE, frame,frame_size))
return 0;
err = save_sigregs(regs,&frame->sregs);
if(!err)
err=__put_user(&frame->sregs,&frame->sc.sregs);
if(!err)
err=__copy_to_user(&frame->sc.oldmask,&set->sig,SIGMASK_COPY_SIZE);
if(!err)
{
regs->gprs[2]=(current->exec_domain
&& current->exec_domain->signal_invmap
&& sig < 32
? current->exec_domain->signal_invmap[sig]
: sig);
/* Set up registers for signal handler */
regs->gprs[15] = (addr_t)frame;
regs->psw.addr = FIX_PSW(ka->sa.sa_handler);
}
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
regs->gprs[14] = FIX_PSW(ka->sa.sa_restorer);
} else {
regs->gprs[14] = FIX_PSW(frame->retcode);
err |= __put_user(retcode, (u16 *)(frame->retcode));
}
return(err ? 0:frame);
}
static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
unsigned long uc_flags, restorer;
size_t frame_size;
frame_size = sizeof(struct rt_sigframe) - sizeof(_sigregs_ext);
/*
* gprs_high are only present for a 31-bit task running on
* a 64-bit kernel (see compat_signal.c) but the space for
* gprs_high need to be allocated if vector registers are
* included in the signal frame on a 31-bit system.
*/
uc_flags = 0;
#ifdef CONFIG_64BIT
if (MACHINE_HAS_VX) {
frame_size += sizeof(_sigregs_ext);
if (current->thread.vxrs)
uc_flags |= UC_VXRS;
}
#endif
frame = get_sigframe(&ksig->ka, regs, frame_size);
if (frame == (void __user *) -1UL)
return -EFAULT;
/* Set up backchain. */
if (__put_user(regs->gprs[15], (addr_t __user *) frame))
return -EFAULT;
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ksig->ka.sa.sa_flags & SA_RESTORER) {
restorer = (unsigned long)
ksig->ka.sa.sa_restorer | PSW_ADDR_AMODE;
} else {
__u16 __user *svc = &frame->svc_insn;
if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn, svc))
return -EFAULT;
restorer = (unsigned long) svc | PSW_ADDR_AMODE;
}
/* Create siginfo on the signal stack */
if (copy_siginfo_to_user(&frame->info, &ksig->info))
return -EFAULT;
/* Store registers needed to create the signal frame */
store_sigregs();
/* Create ucontext on the signal stack. */
if (__put_user(uc_flags, &frame->uc.uc_flags) ||
__put_user(NULL, &frame->uc.uc_link) ||
__save_altstack(&frame->uc.uc_stack, regs->gprs[15]) ||
save_sigregs(regs, &frame->uc.uc_mcontext) ||
__copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)) ||
save_sigregs_ext(regs, &frame->uc.uc_mcontext_ext))
return -EFAULT;
/* Set up registers for signal handler */
regs->gprs[14] = restorer;
regs->gprs[15] = (unsigned long) frame;
/* Force default amode and default user address space control. */
regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
(PSW_USER_BITS & PSW_MASK_ASC) |
(regs->psw.mask & ~PSW_MASK_ASC);
regs->psw.addr = (unsigned long) ksig->ka.sa.sa_handler | PSW_ADDR_AMODE;
regs->gprs[2] = map_signal(ksig->sig);
regs->gprs[3] = (unsigned long) &frame->info;
regs->gprs[4] = (unsigned long) &frame->uc;
regs->gprs[5] = task_thread_info(current)->last_break;
return 0;
}
static int setup_frame(int sig, struct k_sigaction *ka,
sigset_t *set, struct pt_regs * regs)
{
struct sigframe __user *frame;
struct sigcontext sc;
unsigned long restorer;
size_t frame_size;
/*
* gprs_high are only present for a 31-bit task running on
* a 64-bit kernel (see compat_signal.c) but the space for
* gprs_high need to be allocated if vector registers are
* included in the signal frame on a 31-bit system.
*/
frame_size = sizeof(*frame) - sizeof(frame->sregs_ext);
if (MACHINE_HAS_VX)
frame_size += sizeof(frame->sregs_ext);
frame = get_sigframe(ka, regs, frame_size);
if (frame == (void __user *) -1UL)
return -EFAULT;
/* Set up backchain. */
if (__put_user(regs->gprs[15], (addr_t __user *) frame))
return -EFAULT;
/* Create struct sigcontext on the signal stack */
memcpy(&sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE);
sc.sregs = (_sigregs __user __force *) &frame->sregs;
if (__copy_to_user(&frame->sc, &sc, sizeof(frame->sc)))
return -EFAULT;
/* Store registers needed to create the signal frame */
store_sigregs();
/* Create _sigregs on the signal stack */
if (save_sigregs(regs, &frame->sregs))
return -EFAULT;
/* Place signal number on stack to allow backtrace from handler. */
if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
return -EFAULT;
/* Create _sigregs_ext on the signal stack */
if (save_sigregs_ext(regs, &frame->sregs_ext))
return -EFAULT;
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
restorer = (unsigned long) ka->sa.sa_restorer | PSW_ADDR_AMODE;
} else {
/* Signal frame without vector registers are short ! */
__u16 __user *svc = (void __user *) frame + frame_size - 2;
if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn, svc))
return -EFAULT;
restorer = (unsigned long) svc | PSW_ADDR_AMODE;
}
/* Set up registers for signal handler */
regs->gprs[14] = restorer;
regs->gprs[15] = (unsigned long) frame;
/* Force default amode and default user address space control. */
regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
(PSW_USER_BITS & PSW_MASK_ASC) |
(regs->psw.mask & ~PSW_MASK_ASC);
regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
regs->gprs[2] = map_signal(sig);
regs->gprs[3] = (unsigned long) &frame->sc;
/* We forgot to include these in the sigcontext.
To avoid breaking binary compatibility, they are passed as args. */
if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
sig == SIGTRAP || sig == SIGFPE) {
/* set extra registers only for synchronous signals */
regs->gprs[4] = regs->int_code & 127;
regs->gprs[5] = regs->int_parm_long;
regs->gprs[6] = task_thread_info(current)->last_break;
}
return 0;
}
static int setup_frame(int sig, struct k_sigaction *ka,
sigset_t *set, struct pt_regs * regs)
{
sigframe __user *frame;
frame = get_sigframe(ka, regs, sizeof(sigframe));
if (frame == (void __user *) -1UL)
goto give_sigsegv;
if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE))
goto give_sigsegv;
if (save_sigregs(regs, &frame->sregs))
goto give_sigsegv;
if (__put_user(&frame->sregs, &frame->sc.sregs))
goto give_sigsegv;
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa.sa_flags & SA_RESTORER) {
regs->gprs[14] = (unsigned long)
ka->sa.sa_restorer | PSW_ADDR_AMODE;
} else {
regs->gprs[14] = (unsigned long)
frame->retcode | PSW_ADDR_AMODE;
if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
(u16 __user *)(frame->retcode)))
goto give_sigsegv;
}
/* Set up backchain. */
if (__put_user(regs->gprs[15], (addr_t __user *) frame))
goto give_sigsegv;
/* Set up registers for signal handler */
regs->gprs[15] = (unsigned long) frame;
/* Force default amode and default user address space control. */
regs->psw.mask = PSW_MASK_EA | PSW_MASK_BA |
(PSW_USER_BITS & PSW_MASK_ASC) |
(regs->psw.mask & ~PSW_MASK_ASC);
regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
regs->gprs[2] = map_signal(sig);
regs->gprs[3] = (unsigned long) &frame->sc;
/* We forgot to include these in the sigcontext.
To avoid breaking binary compatibility, they are passed as args. */
if (sig == SIGSEGV || sig == SIGBUS || sig == SIGILL ||
sig == SIGTRAP || sig == SIGFPE) {
/* set extra registers only for synchronous signals */
regs->gprs[4] = regs->int_code & 127;
regs->gprs[5] = regs->int_parm_long;
regs->gprs[6] = task_thread_info(current)->last_break;
}
/* Place signal number on stack to allow backtrace from handler. */
if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
goto give_sigsegv;
return 0;
give_sigsegv:
force_sigsegv(sig, current);
return -EFAULT;
}
