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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 "target_signal.h"
#include "signal-common.h"
#include "linux-user/trace.h"
struct target_sigcontext {
union {
/* General-purpose registers. */
abi_ulong gregs[56];
struct {
abi_ulong __gregs[53];
abi_ulong tp; /* Aliases gregs[TREG_TP]. */
abi_ulong sp; /* Aliases gregs[TREG_SP]. */
abi_ulong lr; /* Aliases gregs[TREG_LR]. */
};
};
abi_ulong pc; /* Program counter. */
abi_ulong ics; /* In Interrupt Critical Section? */
abi_ulong faultnum; /* Fault number. */
abi_ulong pad[5];
};
struct target_ucontext {
abi_ulong tuc_flags;
abi_ulong tuc_link;
target_stack_t tuc_stack;
struct target_sigcontext tuc_mcontext;
target_sigset_t tuc_sigmask; /* mask last for extensibility */
};
struct target_rt_sigframe {
unsigned char save_area[16]; /* caller save area */
struct target_siginfo info;
struct target_ucontext uc;
abi_ulong retcode[2];
};
#define INSN_MOVELI_R10_139 0x00045fe551483000ULL /* { moveli r10, 139 } */
#define INSN_SWINT1 0x286b180051485000ULL /* { swint1 } */
static void setup_sigcontext(struct target_sigcontext *sc,
CPUArchState *env, int signo)
{
int i;
for (i = 0; i < TILEGX_R_COUNT; ++i) {
__put_user(env->regs[i], &sc->gregs[i]);
}
__put_user(env->pc, &sc->pc);
__put_user(0, &sc->ics);
__put_user(signo, &sc->faultnum);
}
static void restore_sigcontext(CPUTLGState *env, struct target_sigcontext *sc)
{
int i;
for (i = 0; i < TILEGX_R_COUNT; ++i) {
__get_user(env->regs[i], &sc->gregs[i]);
}
__get_user(env->pc, &sc->pc);
}
static abi_ulong get_sigframe(struct target_sigaction *ka, CPUArchState *env,
size_t frame_size)
{
unsigned long sp = env->regs[TILEGX_R_SP];
if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size))) {
return -1UL;
}
if ((ka->sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) {
sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
}
sp -= frame_size;
sp &= -16UL;
return sp;
}
void setup_rt_frame(int sig, struct target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUArchState *env)
{
abi_ulong frame_addr;
struct target_rt_sigframe *frame;
unsigned long restorer;
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;
}
/* Always write at least the signal number for the stack backtracer. */
if (ka->sa_flags & TARGET_SA_SIGINFO) {
/* At sigreturn time, restore the callee-save registers too. */
tswap_siginfo(&frame->info, info);
/* regs->flags |= PT_FLAGS_RESTORE_REGS; FIXME: we can skip it? */
} else {
__put_user(info->si_signo, &frame->info.si_signo);
}
/* Create the ucontext. */
__put_user(0, &frame->uc.tuc_flags);
__put_user(0, &frame->uc.tuc_link);
__put_user(target_sigaltstack_used.ss_sp, &frame->uc.tuc_stack.ss_sp);
__put_user(sas_ss_flags(env->regs[TILEGX_R_SP]),
&frame->uc.tuc_stack.ss_flags);
__put_user(target_sigaltstack_used.ss_size, &frame->uc.tuc_stack.ss_size);
setup_sigcontext(&frame->uc.tuc_mcontext, env, info->si_signo);
if (ka->sa_flags & TARGET_SA_RESTORER) {
restorer = (unsigned long) ka->sa_restorer;
} else {
__put_user(INSN_MOVELI_R10_139, &frame->retcode[0]);
__put_user(INSN_SWINT1, &frame->retcode[1]);
restorer = frame_addr + offsetof(struct target_rt_sigframe, retcode);
}
env->pc = (unsigned long) ka->_sa_handler;
env->regs[TILEGX_R_SP] = (unsigned long) frame;
env->regs[TILEGX_R_LR] = restorer;
env->regs[0] = (unsigned long) sig;
env->regs[1] = (unsigned long) &frame->info;
env->regs[2] = (unsigned long) &frame->uc;
/* regs->flags |= PT_FLAGS_CALLER_SAVES; FIXME: we can skip it? */
unlock_user_struct(frame, frame_addr, 1);
return;
give_sigsegv:
force_sigsegv(sig);
}
long do_rt_sigreturn(CPUTLGState *env)
{
abi_ulong frame_addr = env->regs[TILEGX_R_SP];
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);
if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
uc.tuc_stack),
0, env->regs[TILEGX_R_SP]) == -EFAULT) {
goto badframe;
}
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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