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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 "user-internals.h"
#include "signal-common.h"
#include "linux-user/trace.h"
struct target_sigcontext {
struct target_pt_regs regs; /* needs to be first */
uint32_t oldmask;
uint32_t usp; /* usp before stacking this gunk on it */
};
/* Signal frames. */
struct target_signal_frame {
struct target_sigcontext sc;
uint32_t extramask[TARGET_NSIG_WORDS - 1];
uint16_t retcode[4]; /* Trampoline code. */
};
struct rt_signal_frame {
siginfo_t *pinfo;
void *puc;
siginfo_t info;
ucontext_t uc;
uint16_t retcode[4]; /* Trampoline code. */
};
static void setup_sigcontext(struct target_sigcontext *sc, CPUCRISState *env)
{
__put_user(env->regs[0], &sc->regs.r0);
__put_user(env->regs[1], &sc->regs.r1);
__put_user(env->regs[2], &sc->regs.r2);
__put_user(env->regs[3], &sc->regs.r3);
__put_user(env->regs[4], &sc->regs.r4);
__put_user(env->regs[5], &sc->regs.r5);
__put_user(env->regs[6], &sc->regs.r6);
__put_user(env->regs[7], &sc->regs.r7);
__put_user(env->regs[8], &sc->regs.r8);
__put_user(env->regs[9], &sc->regs.r9);
__put_user(env->regs[10], &sc->regs.r10);
__put_user(env->regs[11], &sc->regs.r11);
__put_user(env->regs[12], &sc->regs.r12);
__put_user(env->regs[13], &sc->regs.r13);
__put_user(env->regs[14], &sc->usp);
__put_user(env->regs[15], &sc->regs.acr);
__put_user(env->pregs[PR_MOF], &sc->regs.mof);
__put_user(env->pregs[PR_SRP], &sc->regs.srp);
__put_user(env->pc, &sc->regs.erp);
}
static void restore_sigcontext(struct target_sigcontext *sc, CPUCRISState *env)
{
__get_user(env->regs[0], &sc->regs.r0);
__get_user(env->regs[1], &sc->regs.r1);
__get_user(env->regs[2], &sc->regs.r2);
__get_user(env->regs[3], &sc->regs.r3);
__get_user(env->regs[4], &sc->regs.r4);
__get_user(env->regs[5], &sc->regs.r5);
__get_user(env->regs[6], &sc->regs.r6);
__get_user(env->regs[7], &sc->regs.r7);
__get_user(env->regs[8], &sc->regs.r8);
__get_user(env->regs[9], &sc->regs.r9);
__get_user(env->regs[10], &sc->regs.r10);
__get_user(env->regs[11], &sc->regs.r11);
__get_user(env->regs[12], &sc->regs.r12);
__get_user(env->regs[13], &sc->regs.r13);
__get_user(env->regs[14], &sc->usp);
__get_user(env->regs[15], &sc->regs.acr);
__get_user(env->pregs[PR_MOF], &sc->regs.mof);
__get_user(env->pregs[PR_SRP], &sc->regs.srp);
__get_user(env->pc, &sc->regs.erp);
}
static abi_ulong get_sigframe(CPUCRISState *env, int framesize)
{
abi_ulong sp;
/* Align the stack downwards to 4. */
sp = (env->regs[R_SP] & ~3);
return sp - framesize;
}
static void setup_sigreturn(uint16_t *retcode)
{
/* This is movu.w __NR_sigreturn, r9; break 13; */
__put_user(0x9c5f, retcode + 0);
__put_user(TARGET_NR_sigreturn, retcode + 1);
__put_user(0xe93d, retcode + 2);
}
void setup_frame(int sig, struct target_sigaction *ka,
target_sigset_t *set, CPUCRISState *env)
{
struct target_signal_frame *frame;
abi_ulong frame_addr;
int i;
frame_addr = get_sigframe(env, sizeof *frame);
trace_user_setup_frame(env, frame_addr);
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0))
goto badframe;
/*
* The CRIS signal return trampoline. A real linux/CRIS kernel doesn't
* use this trampoline anymore but it sets it up for GDB.
*/
setup_sigreturn(frame->retcode);
/* Save the mask. */
__put_user(set->sig[0], &frame->sc.oldmask);
for(i = 1; i < TARGET_NSIG_WORDS; i++) {
__put_user(set->sig[i], &frame->extramask[i - 1]);
}
setup_sigcontext(&frame->sc, env);
/* Move the stack and setup the arguments for the handler. */
env->regs[R_SP] = frame_addr;
env->regs[10] = sig;
env->pc = (unsigned long) ka->_sa_handler;
/* Link SRP so the guest returns through the trampoline. */
env->pregs[PR_SRP] = default_sigreturn;
unlock_user_struct(frame, frame_addr, 1);
return;
badframe:
force_sigsegv(sig);
}
void setup_rt_frame(int sig, struct target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPUCRISState *env)
{
qemu_log_mask(LOG_UNIMP, "setup_rt_frame: not implemented\n");
}
long do_sigreturn(CPUCRISState *env)
{
struct target_signal_frame *frame;
abi_ulong frame_addr;
target_sigset_t target_set;
sigset_t set;
int i;
frame_addr = env->regs[R_SP];
trace_user_do_sigreturn(env, frame_addr);
/* Make sure the guest isn't playing games. */
if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 1)) {
goto badframe;
}
/* Restore blocked signals */
__get_user(target_set.sig[0], &frame->sc.oldmask);
for(i = 1; i < TARGET_NSIG_WORDS; i++) {
__get_user(target_set.sig[i], &frame->extramask[i - 1]);
}
target_to_host_sigset_internal(&set, &target_set);
set_sigmask(&set);
restore_sigcontext(&frame->sc, env);
unlock_user_struct(frame, frame_addr, 0);
return -QEMU_ESIGRETURN;
badframe:
force_sig(TARGET_SIGSEGV);
return -QEMU_ESIGRETURN;
}
long do_rt_sigreturn(CPUCRISState *env)
{
trace_user_do_rt_sigreturn(env, 0);
qemu_log_mask(LOG_UNIMP, "do_rt_sigreturn: not implemented\n");
return -TARGET_ENOSYS;
}
void setup_sigtramp(abi_ulong sigtramp_page)
{
uint16_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6, 0);
assert(tramp != NULL);
default_sigreturn = sigtramp_page;
setup_sigreturn(tramp);
unlock_user(tramp, sigtramp_page, 6);
}
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