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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"
#define __NUM_GPRS 16
#define __NUM_FPRS 16
#define __NUM_ACRS 16
#define __SIGNAL_FRAMESIZE 160 /* FIXME: 31-bit mode -> 96 */
#define _SIGCONTEXT_NSIG 64
#define _SIGCONTEXT_NSIG_BPW 64 /* FIXME: 31-bit mode -> 32 */
#define _SIGCONTEXT_NSIG_WORDS (_SIGCONTEXT_NSIG / _SIGCONTEXT_NSIG_BPW)
#define _SIGMASK_COPY_SIZE (sizeof(unsigned long)*_SIGCONTEXT_NSIG_WORDS)
#define S390_SYSCALL_OPCODE ((uint16_t)0x0a00)
typedef struct {
target_psw_t psw;
abi_ulong gprs[__NUM_GPRS];
abi_uint acrs[__NUM_ACRS];
} target_s390_regs_common;
typedef struct {
uint32_t fpc;
uint32_t pad;
uint64_t fprs[__NUM_FPRS];
} target_s390_fp_regs;
typedef struct {
target_s390_regs_common regs;
target_s390_fp_regs fpregs;
} target_sigregs;
typedef struct {
abi_ulong oldmask[_SIGCONTEXT_NSIG_WORDS];
abi_ulong sregs;
} target_sigcontext;
typedef struct {
uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
target_sigcontext sc;
target_sigregs sregs;
int signo;
uint16_t retcode;
} sigframe;
struct target_ucontext {
abi_ulong tuc_flags;
abi_ulong tuc_link;
target_stack_t tuc_stack;
target_sigregs tuc_mcontext;
target_sigset_t tuc_sigmask; /* mask last for extensibility */
};
typedef struct {
uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
uint16_t retcode;
struct target_siginfo info;
struct target_ucontext uc;
} rt_sigframe;
static inline abi_ulong
get_sigframe(struct target_sigaction *ka, CPUS390XState *env, size_t frame_size)
{
abi_ulong sp;
/* Default to using normal stack */
sp = get_sp_from_cpustate(env);
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa_flags & TARGET_SA_ONSTACK) {
sp = target_sigsp(sp, ka);
}
/* This is the legacy signal stack switching. */
else if (/* FIXME !user_mode(regs) */ 0 &&
!(ka->sa_flags & TARGET_SA_RESTORER) &&
ka->sa_restorer) {
sp = (abi_ulong) ka->sa_restorer;
}
return (sp - frame_size) & -8ul;
}
static void save_sigregs(CPUS390XState *env, target_sigregs *sregs)
{
int i;
//save_access_regs(current->thread.acrs); FIXME
/* Copy a 'clean' PSW mask to the user to avoid leaking
information about whether PER is currently on. */
__put_user(env->psw.mask, &sregs->regs.psw.mask);
__put_user(env->psw.addr, &sregs->regs.psw.addr);
for (i = 0; i < 16; i++) {
__put_user(env->regs[i], &sregs->regs.gprs[i]);
}
for (i = 0; i < 16; i++) {
__put_user(env->aregs[i], &sregs->regs.acrs[i]);
}
/*
* We have to store the fp registers to current->thread.fp_regs
* to merge them with the emulated registers.
*/
//save_fp_regs(¤t->thread.fp_regs); FIXME
for (i = 0; i < 16; i++) {
__put_user(*get_freg(env, i), &sregs->fpregs.fprs[i]);
}
}
void setup_frame(int sig, struct target_sigaction *ka,
target_sigset_t *set, CPUS390XState *env)
{
sigframe *frame;
abi_ulong frame_addr;
frame_addr = get_sigframe(ka, env, sizeof(*frame));
trace_user_setup_frame(env, frame_addr);
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
goto give_sigsegv;
}
__put_user(set->sig[0], &frame->sc.oldmask[0]);
save_sigregs(env, &frame->sregs);
__put_user((abi_ulong)(unsigned long)&frame->sregs, &frame->sc.sregs);
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa_flags & TARGET_SA_RESTORER) {
env->regs[14] = ka->sa_restorer;
} else {
env->regs[14] = frame_addr + offsetof(sigframe, retcode);
__put_user(S390_SYSCALL_OPCODE | TARGET_NR_sigreturn,
&frame->retcode);
}
/* Set up backchain. */
__put_user(env->regs[15], (abi_ulong *) frame);
/* Set up registers for signal handler */
env->regs[15] = frame_addr;
env->psw.addr = ka->_sa_handler;
env->regs[2] = sig; //map_signal(sig);
env->regs[3] = frame_addr += offsetof(typeof(*frame), sc);
/* We forgot to include these in the sigcontext.
To avoid breaking binary compatibility, they are passed as args. */
env->regs[4] = 0; // FIXME: no clue... current->thread.trap_no;
env->regs[5] = 0; // FIXME: no clue... current->thread.prot_addr;
/* Place signal number on stack to allow backtrace from handler. */
__put_user(env->regs[2], &frame->signo);
unlock_user_struct(frame, frame_addr, 1);
return;
give_sigsegv:
force_sigsegv(sig);
}
void setup_rt_frame(int sig, struct target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUS390XState *env)
{
int i;
rt_sigframe *frame;
abi_ulong frame_addr;
frame_addr = get_sigframe(ka, env, sizeof *frame);
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);
/* Create the ucontext. */
__put_user(0, &frame->uc.tuc_flags);
__put_user((abi_ulong)0, (abi_ulong *)&frame->uc.tuc_link);
target_save_altstack(&frame->uc.tuc_stack, env);
save_sigregs(env, &frame->uc.tuc_mcontext);
for (i = 0; i < TARGET_NSIG_WORDS; i++) {
__put_user((abi_ulong)set->sig[i],
(abi_ulong *)&frame->uc.tuc_sigmask.sig[i]);
}
/* Set up to return from userspace. If provided, use a stub
already in userspace. */
if (ka->sa_flags & TARGET_SA_RESTORER) {
env->regs[14] = ka->sa_restorer;
} else {
env->regs[14] = frame_addr + offsetof(typeof(*frame), retcode);
__put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn,
&frame->retcode);
}
/* Set up backchain. */
__put_user(env->regs[15], (abi_ulong *) frame);
/* Set up registers for signal handler */
env->regs[15] = frame_addr;
env->psw.addr = ka->_sa_handler;
env->regs[2] = sig; //map_signal(sig);
env->regs[3] = frame_addr + offsetof(typeof(*frame), info);
env->regs[4] = frame_addr + offsetof(typeof(*frame), uc);
return;
give_sigsegv:
force_sigsegv(sig);
}
static void restore_sigregs(CPUS390XState *env, target_sigregs *sc)
{
target_ulong prev_addr;
int i;
for (i = 0; i < 16; i++) {
__get_user(env->regs[i], &sc->regs.gprs[i]);
}
prev_addr = env->psw.addr;
__get_user(env->psw.mask, &sc->regs.psw.mask);
__get_user(env->psw.addr, &sc->regs.psw.addr);
trace_user_s390x_restore_sigregs(env, env->psw.addr, prev_addr);
for (i = 0; i < 16; i++) {
__get_user(env->aregs[i], &sc->regs.acrs[i]);
}
for (i = 0; i < 16; i++) {
__get_user(*get_freg(env, i), &sc->fpregs.fprs[i]);
}
}
long do_sigreturn(CPUS390XState *env)
{
sigframe *frame;
abi_ulong frame_addr = env->regs[15];
target_sigset_t target_set;
sigset_t set;
trace_user_do_sigreturn(env, frame_addr);
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
goto badframe;
}
__get_user(target_set.sig[0], &frame->sc.oldmask[0]);
target_to_host_sigset_internal(&set, &target_set);
set_sigmask(&set); /* ~_BLOCKABLE? */
restore_sigregs(env, &frame->sregs);
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
badframe:
force_sig(TARGET_SIGSEGV);
return -TARGET_QEMU_ESIGRETURN;
}
long do_rt_sigreturn(CPUS390XState *env)
{
rt_sigframe *frame;
abi_ulong frame_addr = env->regs[15];
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); /* ~_BLOCKABLE? */
restore_sigregs(env, &frame->uc.tuc_mcontext);
target_restore_altstack(&frame->uc.tuc_stack, env);
unlock_user_struct(frame, frame_addr, 0);
return -TARGET_QEMU_ESIGRETURN;
badframe:
unlock_user_struct(frame, frame_addr, 0);
force_sig(TARGET_SIGSEGV);
return -TARGET_QEMU_ESIGRETURN;
}
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