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/*
* Emulation of Linux signals
*
* Copyright (c) 2003 Fabrice Bellard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu.h"
#include "signal-common.h"
#include "linux-user/trace.h"
struct target_sigcontext {
abi_ulong sc_flags;
abi_ulong sc_gr[32];
uint64_t sc_fr[32];
abi_ulong sc_iasq[2];
abi_ulong sc_iaoq[2];
abi_ulong sc_sar;
};
struct target_ucontext {
abi_uint tuc_flags;
abi_ulong tuc_link;
target_stack_t tuc_stack;
abi_uint pad[1];
struct target_sigcontext tuc_mcontext;
target_sigset_t tuc_sigmask;
};
struct target_rt_sigframe {
abi_uint tramp[9];
target_siginfo_t info;
struct target_ucontext uc;
/* hidden location of upper halves of pa2.0 64-bit gregs */
};
static void setup_sigcontext(struct target_sigcontext *sc, CPUArchState *env)
{
int flags = 0;
int i;
/* ??? if on_sig_stack, flags |= 1 (PARISC_SC_FLAG_ONSTACK). */
if (env->iaoq_f < TARGET_PAGE_SIZE) {
/* In the gateway page, executing a syscall. */
flags |= 2; /* PARISC_SC_FLAG_IN_SYSCALL */
__put_user(env->gr[31], &sc->sc_iaoq[0]);
__put_user(env->gr[31] + 4, &sc->sc_iaoq[1]);
} else {
__put_user(env->iaoq_f, &sc->sc_iaoq[0]);
__put_user(env->iaoq_b, &sc->sc_iaoq[1]);
}
__put_user(0, &sc->sc_iasq[0]);
__put_user(0, &sc->sc_iasq[1]);
__put_user(flags, &sc->sc_flags);
__put_user(cpu_hppa_get_psw(env), &sc->sc_gr[0]);
for (i = 1; i < 32; ++i) {
__put_user(env->gr[i], &sc->sc_gr[i]);
}
__put_user((uint64_t)env->fr0_shadow << 32, &sc->sc_fr[0]);
for (i = 1; i < 32; ++i) {
__put_user(env->fr[i], &sc->sc_fr[i]);
}
__put_user(env->cr[CR_SAR], &sc->sc_sar);
}
static void restore_sigcontext(CPUArchState *env, struct target_sigcontext *sc)
{
target_ulong psw;
int i;
__get_user(psw, &sc->sc_gr[0]);
cpu_hppa_put_psw(env, psw);
for (i = 1; i < 32; ++i) {
__get_user(env->gr[i], &sc->sc_gr[i]);
}
for (i = 0; i < 32; ++i) {
__get_user(env->fr[i], &sc->sc_fr[i]);
}
cpu_hppa_loaded_fr0(env);
__get_user(env->iaoq_f, &sc->sc_iaoq[0]);
__get_user(env->iaoq_b, &sc->sc_iaoq[1]);
__get_user(env->cr[CR_SAR], &sc->sc_sar);
}
/* No, this doesn't look right, but it's copied straight from the kernel. */
#define PARISC_RT_SIGFRAME_SIZE32 \
((sizeof(struct target_rt_sigframe) + 48 + 64) & -64)
void setup_rt_frame(int sig, struct target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUArchState *env)
{
abi_ulong frame_addr, sp, haddr;
struct target_rt_sigframe *frame;
int i;
TaskState *ts = (TaskState *)thread_cpu->opaque;
sp = get_sp_from_cpustate(env);
if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) {
sp = (ts->sigaltstack_used.ss_sp + 0x7f) & ~0x3f;
}
frame_addr = QEMU_ALIGN_UP(sp, 64);
sp = frame_addr + PARISC_RT_SIGFRAME_SIZE32;
trace_user_setup_rt_frame(env, frame_addr);
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
goto give_sigsegv;
}
tswap_siginfo(&frame->info, info);
frame->uc.tuc_flags = 0;
frame->uc.tuc_link = 0;
target_save_altstack(&frame->uc.tuc_stack, env);
for (i = 0; i < TARGET_NSIG_WORDS; i++) {
__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
}
setup_sigcontext(&frame->uc.tuc_mcontext, env);
__put_user(0x34190000, frame->tramp + 0); /* ldi 0,%r25 */
__put_user(0x3414015a, frame->tramp + 1); /* ldi __NR_rt_sigreturn,%r20 */
__put_user(0xe4008200, frame->tramp + 2); /* be,l 0x100(%sr2,%r0) */
__put_user(0x08000240, frame->tramp + 3); /* nop */
unlock_user_struct(frame, frame_addr, 1);
env->gr[2] = h2g(frame->tramp);
env->gr[30] = sp;
env->gr[26] = sig;
env->gr[25] = h2g(&frame->info);
env->gr[24] = h2g(&frame->uc);
haddr = ka->_sa_handler;
if (haddr & 2) {
/* Function descriptor. */
target_ulong *fdesc, dest;
haddr &= -4;
if (!lock_user_struct(VERIFY_READ, fdesc, haddr, 1)) {
goto give_sigsegv;
}
__get_user(dest, fdesc);
__get_user(env->gr[19], fdesc + 1);
unlock_user_struct(fdesc, haddr, 1);
haddr = dest;
}
env->iaoq_f = haddr;
env->iaoq_b = haddr + 4;
return;
give_sigsegv:
force_sigsegv(sig);
}
long do_rt_sigreturn(CPUArchState *env)
{
abi_ulong frame_addr = env->gr[30] - PARISC_RT_SIGFRAME_SIZE32;
struct target_rt_sigframe *frame;
sigset_t set;
trace_user_do_rt_sigreturn(env, frame_addr);
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
goto badframe;
}
target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
set_sigmask(&set);
restore_sigcontext(env, &frame->uc.tuc_mcontext);
unlock_user_struct(frame, frame_addr, 0);
if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
uc.tuc_stack),
0, env->gr[30]) == -EFAULT) {
goto badframe;
}
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
badframe:
force_sig(TARGET_SIGSEGV);
return -TARGET_QEMU_ESIGRETURN;
}
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