linux-user/alpha/signal.c - qemu - Git at Google

 /*
  *  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 {
     abi_long sc_onstack;
     abi_long sc_mask;
     abi_long sc_pc;
     abi_long sc_ps;
     abi_long sc_regs[32];
     abi_long sc_ownedfp;
     abi_long sc_fpregs[32];
     abi_ulong sc_fpcr;
     abi_ulong sc_fp_control;
     abi_ulong sc_reserved1;
     abi_ulong sc_reserved2;
     abi_ulong sc_ssize;
     abi_ulong sc_sbase;
     abi_ulong sc_traparg_a0;
     abi_ulong sc_traparg_a1;
     abi_ulong sc_traparg_a2;
     abi_ulong sc_fp_trap_pc;
     abi_ulong sc_fp_trigger_sum;
     abi_ulong sc_fp_trigger_inst;
 };

 struct target_ucontext {
     abi_ulong tuc_flags;
     abi_ulong tuc_link;
     abi_ulong tuc_osf_sigmask;
     target_stack_t tuc_stack;
     struct target_sigcontext tuc_mcontext;
     target_sigset_t tuc_sigmask;
 };

 struct target_sigframe {
     struct target_sigcontext sc;
 };

 struct target_rt_sigframe {
     target_siginfo_t info;
     struct target_ucontext uc;
 };

 #define INSN_MOV_R30_R16        0x47fe0410
 #define INSN_LDI_R0             0x201f0000
 #define INSN_CALLSYS            0x00000083

 static void setup_sigcontext(struct target_sigcontext *sc, CPUAlphaState *env,
                              abi_ulong frame_addr, target_sigset_t *set)
 {
     int i;

     __put_user(on_sig_stack(frame_addr), &sc->sc_onstack);
     __put_user(set->sig[0], &sc->sc_mask);
     __put_user(env->pc, &sc->sc_pc);
     __put_user(8, &sc->sc_ps);

     for (i = 0; i < 31; ++i) {
         __put_user(env->ir[i], &sc->sc_regs[i]);
     }
     __put_user(0, &sc->sc_regs[31]);

     for (i = 0; i < 31; ++i) {
         __put_user(env->fir[i], &sc->sc_fpregs[i]);
     }
     __put_user(0, &sc->sc_fpregs[31]);
     __put_user(cpu_alpha_load_fpcr(env), &sc->sc_fpcr);

     __put_user(0, &sc->sc_traparg_a0); /* FIXME */
     __put_user(0, &sc->sc_traparg_a1); /* FIXME */
     __put_user(0, &sc->sc_traparg_a2); /* FIXME */
 }

 static void restore_sigcontext(CPUAlphaState *env,
                                struct target_sigcontext *sc)
 {
     uint64_t fpcr;
     int i;

     __get_user(env->pc, &sc->sc_pc);

     for (i = 0; i < 31; ++i) {
         __get_user(env->ir[i], &sc->sc_regs[i]);
     }
     for (i = 0; i < 31; ++i) {
         __get_user(env->fir[i], &sc->sc_fpregs[i]);
     }

     __get_user(fpcr, &sc->sc_fpcr);
     cpu_alpha_store_fpcr(env, fpcr);
 }

 static inline abi_ulong get_sigframe(struct target_sigaction *sa,
                                      CPUAlphaState *env,
                                      unsigned long framesize)
 {
     abi_ulong sp;

     sp = target_sigsp(get_sp_from_cpustate(env), sa);

     return (sp - framesize) & -32;
 }

 void setup_frame(int sig, struct target_sigaction *ka,
                  target_sigset_t *set, CPUAlphaState *env)
 {
     abi_ulong frame_addr, r26;
     struct target_sigframe *frame;
     int err = 0;

     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;
     }

     setup_sigcontext(&frame->sc, env, frame_addr, set);

     if (ka->ka_restorer) {
         r26 = ka->ka_restorer;
     } else {
         r26 = default_sigreturn;
     }

     unlock_user_struct(frame, frame_addr, 1);

     if (err) {
 give_sigsegv:
         force_sigsegv(sig);
         return;
     }

     env->ir[IR_RA] = r26;
     env->ir[IR_PV] = env->pc = ka->_sa_handler;
     env->ir[IR_A0] = sig;
     env->ir[IR_A1] = 0;
     env->ir[IR_A2] = frame_addr + offsetof(struct target_sigframe, sc);
     env->ir[IR_SP] = frame_addr;
 }

 void setup_rt_frame(int sig, struct target_sigaction *ka,
                     target_siginfo_t *info,
                     target_sigset_t *set, CPUAlphaState *env)
 {
     abi_ulong frame_addr, r26;
     struct target_rt_sigframe *frame;
     int i, err = 0;

     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;
     }

     frame->info = *info;

     __put_user(0, &frame->uc.tuc_flags);
     __put_user(0, &frame->uc.tuc_link);
     __put_user(set->sig[0], &frame->uc.tuc_osf_sigmask);

     target_save_altstack(&frame->uc.tuc_stack, env);

     setup_sigcontext(&frame->uc.tuc_mcontext, env, frame_addr, set);
     for (i = 0; i < TARGET_NSIG_WORDS; ++i) {
         __put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
     }

     if (ka->ka_restorer) {
         r26 = ka->ka_restorer;
     } else {
         r26 = default_rt_sigreturn;
     }

     if (err) {
 give_sigsegv:
         force_sigsegv(sig);
         return;
     }

     env->ir[IR_RA] = r26;
     env->ir[IR_PV] = env->pc = ka->_sa_handler;
     env->ir[IR_A0] = sig;
     env->ir[IR_A1] = frame_addr + offsetof(struct target_rt_sigframe, info);
     env->ir[IR_A2] = frame_addr + offsetof(struct target_rt_sigframe, uc);
     env->ir[IR_SP] = frame_addr;
 }

 long do_sigreturn(CPUAlphaState *env)
 {
     struct target_sigcontext *sc;
     abi_ulong sc_addr = env->ir[IR_A0];
     target_sigset_t target_set;
     sigset_t set;

     if (!lock_user_struct(VERIFY_READ, sc, sc_addr, 1)) {
         goto badframe;
     }

     target_sigemptyset(&target_set);
     __get_user(target_set.sig[0], &sc->sc_mask);

     target_to_host_sigset_internal(&set, &target_set);
     set_sigmask(&set);

     restore_sigcontext(env, sc);
     unlock_user_struct(sc, sc_addr, 0);
     return -QEMU_ESIGRETURN;

 badframe:
     force_sig(TARGET_SIGSEGV);
     return -QEMU_ESIGRETURN;
 }

 long do_rt_sigreturn(CPUAlphaState *env)
 {
     abi_ulong frame_addr = env->ir[IR_A0];
     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);
     target_restore_altstack(&frame->uc.tuc_stack, env);

     unlock_user_struct(frame, frame_addr, 0);
     return -QEMU_ESIGRETURN;


 badframe:
     unlock_user_struct(frame, frame_addr, 0);
     force_sig(TARGET_SIGSEGV);
     return -QEMU_ESIGRETURN;
 }

 void setup_sigtramp(abi_ulong sigtramp_page)
 {
     uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6 * 4, 0);
     assert(tramp != NULL);

     default_sigreturn = sigtramp_page;
     __put_user(INSN_MOV_R30_R16, &tramp[0]);
     __put_user(INSN_LDI_R0 + TARGET_NR_sigreturn, &tramp[1]);
     __put_user(INSN_CALLSYS, &tramp[2]);

     default_rt_sigreturn = sigtramp_page + 3 * 4;
     __put_user(INSN_MOV_R30_R16, &tramp[3]);
     __put_user(INSN_LDI_R0 + TARGET_NR_rt_sigreturn, &tramp[4]);
     __put_user(INSN_CALLSYS, &tramp[5]);

     unlock_user(tramp, sigtramp_page, 6 * 4);
 }
	/*
	* 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 {
	abi_long sc_onstack;
	abi_long sc_mask;
	abi_long sc_pc;
	abi_long sc_ps;
	abi_long sc_regs[32];
	abi_long sc_ownedfp;
	abi_long sc_fpregs[32];
	abi_ulong sc_fpcr;
	abi_ulong sc_fp_control;
	abi_ulong sc_reserved1;
	abi_ulong sc_reserved2;
	abi_ulong sc_ssize;
	abi_ulong sc_sbase;
	abi_ulong sc_traparg_a0;
	abi_ulong sc_traparg_a1;
	abi_ulong sc_traparg_a2;
	abi_ulong sc_fp_trap_pc;
	abi_ulong sc_fp_trigger_sum;
	abi_ulong sc_fp_trigger_inst;
	};

	struct target_ucontext {
	abi_ulong tuc_flags;
	abi_ulong tuc_link;
	abi_ulong tuc_osf_sigmask;
	target_stack_t tuc_stack;
	struct target_sigcontext tuc_mcontext;
	target_sigset_t tuc_sigmask;
	};

	struct target_sigframe {
	struct target_sigcontext sc;
	};

	struct target_rt_sigframe {
	target_siginfo_t info;
	struct target_ucontext uc;
	};

	#define INSN_MOV_R30_R16 0x47fe0410
	#define INSN_LDI_R0 0x201f0000
	#define INSN_CALLSYS 0x00000083

	static void setup_sigcontext(struct target_sigcontext sc, CPUAlphaState env,
	abi_ulong frame_addr, target_sigset_t *set)
	{
	int i;

	__put_user(on_sig_stack(frame_addr), &sc->sc_onstack);
	__put_user(set->sig[0], &sc->sc_mask);
	__put_user(env->pc, &sc->sc_pc);
	__put_user(8, &sc->sc_ps);

	for (i = 0; i < 31; ++i) {
	__put_user(env->ir[i], &sc->sc_regs[i]);
	}
	__put_user(0, &sc->sc_regs[31]);

	for (i = 0; i < 31; ++i) {
	__put_user(env->fir[i], &sc->sc_fpregs[i]);
	}
	__put_user(0, &sc->sc_fpregs[31]);
	__put_user(cpu_alpha_load_fpcr(env), &sc->sc_fpcr);

	__put_user(0, &sc->sc_traparg_a0); /* FIXME */
	__put_user(0, &sc->sc_traparg_a1); /* FIXME */
	__put_user(0, &sc->sc_traparg_a2); /* FIXME */
	}

	static void restore_sigcontext(CPUAlphaState *env,
	struct target_sigcontext *sc)
	{
	uint64_t fpcr;
	int i;

	__get_user(env->pc, &sc->sc_pc);

	for (i = 0; i < 31; ++i) {
	__get_user(env->ir[i], &sc->sc_regs[i]);
	}
	for (i = 0; i < 31; ++i) {
	__get_user(env->fir[i], &sc->sc_fpregs[i]);
	}

	__get_user(fpcr, &sc->sc_fpcr);
	cpu_alpha_store_fpcr(env, fpcr);
	}

	static inline abi_ulong get_sigframe(struct target_sigaction *sa,
	CPUAlphaState *env,
	unsigned long framesize)
	{
	abi_ulong sp;

	sp = target_sigsp(get_sp_from_cpustate(env), sa);

	return (sp - framesize) & -32;
	}

	void setup_frame(int sig, struct target_sigaction *ka,
	target_sigset_t set, CPUAlphaState env)
	{
	abi_ulong frame_addr, r26;
	struct target_sigframe *frame;
	int err = 0;

	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;
	}

	setup_sigcontext(&frame->sc, env, frame_addr, set);

	if (ka->ka_restorer) {
	r26 = ka->ka_restorer;
	} else {
	r26 = default_sigreturn;
	}

	unlock_user_struct(frame, frame_addr, 1);

	if (err) {
	give_sigsegv:
	force_sigsegv(sig);
	return;
	}

	env->ir[IR_RA] = r26;
	env->ir[IR_PV] = env->pc = ka->_sa_handler;
	env->ir[IR_A0] = sig;
	env->ir[IR_A1] = 0;
	env->ir[IR_A2] = frame_addr + offsetof(struct target_sigframe, sc);
	env->ir[IR_SP] = frame_addr;
	}

	void setup_rt_frame(int sig, struct target_sigaction *ka,
	target_siginfo_t *info,
	target_sigset_t set, CPUAlphaState env)
	{
	abi_ulong frame_addr, r26;
	struct target_rt_sigframe *frame;
	int i, err = 0;

	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;
	}

	frame->info = *info;

	__put_user(0, &frame->uc.tuc_flags);
	__put_user(0, &frame->uc.tuc_link);
	__put_user(set->sig[0], &frame->uc.tuc_osf_sigmask);

	target_save_altstack(&frame->uc.tuc_stack, env);

	setup_sigcontext(&frame->uc.tuc_mcontext, env, frame_addr, set);
	for (i = 0; i < TARGET_NSIG_WORDS; ++i) {
	__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
	}

	if (ka->ka_restorer) {
	r26 = ka->ka_restorer;
	} else {
	r26 = default_rt_sigreturn;
	}

	if (err) {
	give_sigsegv:
	force_sigsegv(sig);
	return;
	}

	env->ir[IR_RA] = r26;
	env->ir[IR_PV] = env->pc = ka->_sa_handler;
	env->ir[IR_A0] = sig;
	env->ir[IR_A1] = frame_addr + offsetof(struct target_rt_sigframe, info);
	env->ir[IR_A2] = frame_addr + offsetof(struct target_rt_sigframe, uc);
	env->ir[IR_SP] = frame_addr;
	}

	long do_sigreturn(CPUAlphaState *env)
	{
	struct target_sigcontext *sc;
	abi_ulong sc_addr = env->ir[IR_A0];
	target_sigset_t target_set;
	sigset_t set;

	if (!lock_user_struct(VERIFY_READ, sc, sc_addr, 1)) {
	goto badframe;
	}

	target_sigemptyset(&target_set);
	__get_user(target_set.sig[0], &sc->sc_mask);

	target_to_host_sigset_internal(&set, &target_set);
	set_sigmask(&set);

	restore_sigcontext(env, sc);
	unlock_user_struct(sc, sc_addr, 0);
	return -QEMU_ESIGRETURN;

	badframe:
	force_sig(TARGET_SIGSEGV);
	return -QEMU_ESIGRETURN;
	}

	long do_rt_sigreturn(CPUAlphaState *env)
	{
	abi_ulong frame_addr = env->ir[IR_A0];
	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);
	target_restore_altstack(&frame->uc.tuc_stack, env);

	unlock_user_struct(frame, frame_addr, 0);
	return -QEMU_ESIGRETURN;


	badframe:
	unlock_user_struct(frame, frame_addr, 0);
	force_sig(TARGET_SIGSEGV);
	return -QEMU_ESIGRETURN;
	}

	void setup_sigtramp(abi_ulong sigtramp_page)
	{
	uint32_t tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6 4, 0);
	assert(tramp != NULL);

	default_sigreturn = sigtramp_page;
	__put_user(INSN_MOV_R30_R16, &tramp[0]);
	__put_user(INSN_LDI_R0 + TARGET_NR_sigreturn, &tramp[1]);
	__put_user(INSN_CALLSYS, &tramp[2]);

	default_rt_sigreturn = sigtramp_page + 3 * 4;
	__put_user(INSN_MOV_R30_R16, &tramp[3]);
	__put_user(INSN_LDI_R0 + TARGET_NR_rt_sigreturn, &tramp[4]);
	__put_user(INSN_CALLSYS, &tramp[5]);

	unlock_user(tramp, sigtramp_page, 6 * 4);
	}