2018-04-24 22:26:16 +03:00
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/*
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* Emulation of Linux signals
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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2018-04-24 22:26:30 +03:00
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#include "qemu/osdep.h"
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#include "qemu.h"
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2021-09-08 18:44:03 +03:00
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#include "user-internals.h"
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2018-04-24 22:26:30 +03:00
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#include "signal-common.h"
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#include "linux-user/trace.h"
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struct target_sigcontext {
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abi_ulong sc_pc;
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abi_ulong sc_ps;
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abi_ulong sc_lbeg;
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abi_ulong sc_lend;
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abi_ulong sc_lcount;
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abi_ulong sc_sar;
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abi_ulong sc_acclo;
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abi_ulong sc_acchi;
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abi_ulong sc_a[16];
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abi_ulong sc_xtregs;
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};
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struct target_ucontext {
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abi_ulong tuc_flags;
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abi_ulong tuc_link;
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target_stack_t tuc_stack;
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struct target_sigcontext tuc_mcontext;
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target_sigset_t tuc_sigmask;
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};
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struct target_rt_sigframe {
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target_siginfo_t info;
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struct target_ucontext uc;
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/* TODO: xtregs */
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uint8_t retcode[6];
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abi_ulong window[4];
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};
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static abi_ulong get_sigframe(struct target_sigaction *sa,
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CPUXtensaState *env,
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unsigned long framesize)
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{
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2018-04-11 22:23:47 +03:00
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abi_ulong sp;
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sp = target_sigsp(get_sp_from_cpustate(env), sa);
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2018-04-24 22:26:30 +03:00
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return (sp - framesize) & -16;
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}
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static int flush_window_regs(CPUXtensaState *env)
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{
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uint32_t wb = env->sregs[WINDOW_BASE];
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uint32_t ws = xtensa_replicate_windowstart(env) >> (wb + 1);
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unsigned d = ctz32(ws) + 1;
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unsigned i;
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int ret = 0;
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for (i = d; i < env->config->nareg / 4; i += d) {
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uint32_t ssp, osp;
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unsigned j;
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ws >>= d;
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xtensa_rotate_window(env, d);
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if (ws & 0x1) {
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ssp = env->regs[5];
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d = 1;
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} else if (ws & 0x2) {
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ssp = env->regs[9];
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ret |= get_user_ual(osp, env->regs[1] - 12);
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osp -= 32;
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d = 2;
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} else if (ws & 0x4) {
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ssp = env->regs[13];
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ret |= get_user_ual(osp, env->regs[1] - 12);
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osp -= 48;
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d = 3;
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} else {
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g_assert_not_reached();
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}
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for (j = 0; j < 4; ++j) {
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ret |= put_user_ual(env->regs[j], ssp - 16 + j * 4);
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}
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for (j = 4; j < d * 4; ++j) {
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ret |= put_user_ual(env->regs[j], osp - 16 + j * 4);
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}
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}
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xtensa_rotate_window(env, d);
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g_assert(env->sregs[WINDOW_BASE] == wb);
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return ret == 0;
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}
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static int setup_sigcontext(struct target_rt_sigframe *frame,
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CPUXtensaState *env)
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{
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struct target_sigcontext *sc = &frame->uc.tuc_mcontext;
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int i;
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__put_user(env->pc, &sc->sc_pc);
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__put_user(env->sregs[PS], &sc->sc_ps);
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__put_user(env->sregs[LBEG], &sc->sc_lbeg);
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__put_user(env->sregs[LEND], &sc->sc_lend);
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__put_user(env->sregs[LCOUNT], &sc->sc_lcount);
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if (!flush_window_regs(env)) {
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return 0;
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}
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for (i = 0; i < 16; ++i) {
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__put_user(env->regs[i], sc->sc_a + i);
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}
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__put_user(0, &sc->sc_xtregs);
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/* TODO: xtregs */
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return 1;
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}
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2021-09-29 16:05:51 +03:00
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static void install_sigtramp(uint8_t *tramp)
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{
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#ifdef TARGET_WORDS_BIGENDIAN
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/* Generate instruction: MOVI a2, __NR_rt_sigreturn */
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__put_user(0x22, &tramp[0]);
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__put_user(0x0a, &tramp[1]);
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__put_user(TARGET_NR_rt_sigreturn, &tramp[2]);
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/* Generate instruction: SYSCALL */
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__put_user(0x00, &tramp[3]);
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__put_user(0x05, &tramp[4]);
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__put_user(0x00, &tramp[5]);
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#else
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/* Generate instruction: MOVI a2, __NR_rt_sigreturn */
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__put_user(0x22, &tramp[0]);
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__put_user(0xa0, &tramp[1]);
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__put_user(TARGET_NR_rt_sigreturn, &tramp[2]);
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/* Generate instruction: SYSCALL */
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__put_user(0x00, &tramp[3]);
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__put_user(0x50, &tramp[4]);
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__put_user(0x00, &tramp[5]);
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#endif
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}
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2018-04-24 22:26:30 +03:00
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void setup_rt_frame(int sig, struct target_sigaction *ka,
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target_siginfo_t *info,
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target_sigset_t *set, CPUXtensaState *env)
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{
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abi_ulong frame_addr;
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struct target_rt_sigframe *frame;
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uint32_t ra;
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2019-09-06 19:57:13 +03:00
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bool abi_call0;
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unsigned base;
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2018-04-24 22:26:30 +03:00
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int i;
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frame_addr = get_sigframe(ka, env, sizeof(*frame));
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trace_user_setup_rt_frame(env, frame_addr);
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if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
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goto give_sigsegv;
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}
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if (ka->sa_flags & SA_SIGINFO) {
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tswap_siginfo(&frame->info, info);
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}
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__put_user(0, &frame->uc.tuc_flags);
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__put_user(0, &frame->uc.tuc_link);
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2018-04-11 22:23:47 +03:00
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target_save_altstack(&frame->uc.tuc_stack, env);
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2018-04-24 22:26:30 +03:00
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if (!setup_sigcontext(frame, env)) {
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unlock_user_struct(frame, frame_addr, 0);
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goto give_sigsegv;
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}
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for (i = 0; i < TARGET_NSIG_WORDS; ++i) {
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__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i]);
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}
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if (ka->sa_flags & TARGET_SA_RESTORER) {
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ra = ka->sa_restorer;
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} else {
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2021-09-29 16:05:51 +03:00
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/* Not used, but retain for ABI compatibility. */
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install_sigtramp(frame->retcode);
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ra = default_rt_sigreturn;
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2018-04-24 22:26:30 +03:00
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}
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memset(env->regs, 0, sizeof(env->regs));
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env->pc = ka->_sa_handler;
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env->regs[1] = frame_addr;
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env->sregs[WINDOW_BASE] = 0;
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env->sregs[WINDOW_START] = 1;
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2019-09-06 19:57:13 +03:00
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abi_call0 = (env->sregs[PS] & PS_WOE) == 0;
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env->sregs[PS] = PS_UM | (3 << PS_RING_SHIFT);
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if (abi_call0) {
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base = 0;
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env->regs[base] = ra;
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} else {
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env->sregs[PS] |= PS_WOE | (1 << PS_CALLINC_SHIFT);
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base = 4;
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env->regs[base] = (ra & 0x3fffffff) | 0x40000000;
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}
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env->regs[base + 2] = sig;
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env->regs[base + 3] = frame_addr + offsetof(struct target_rt_sigframe,
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info);
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env->regs[base + 4] = frame_addr + offsetof(struct target_rt_sigframe, uc);
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2018-04-24 22:26:30 +03:00
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unlock_user_struct(frame, frame_addr, 1);
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return;
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give_sigsegv:
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force_sigsegv(sig);
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return;
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}
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static void restore_sigcontext(CPUXtensaState *env,
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struct target_rt_sigframe *frame)
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{
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struct target_sigcontext *sc = &frame->uc.tuc_mcontext;
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uint32_t ps;
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int i;
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__get_user(env->pc, &sc->sc_pc);
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__get_user(ps, &sc->sc_ps);
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__get_user(env->sregs[LBEG], &sc->sc_lbeg);
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__get_user(env->sregs[LEND], &sc->sc_lend);
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__get_user(env->sregs[LCOUNT], &sc->sc_lcount);
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env->sregs[WINDOW_BASE] = 0;
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env->sregs[WINDOW_START] = 1;
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env->sregs[PS] = deposit32(env->sregs[PS],
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PS_CALLINC_SHIFT,
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PS_CALLINC_LEN,
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extract32(ps, PS_CALLINC_SHIFT,
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PS_CALLINC_LEN));
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for (i = 0; i < 16; ++i) {
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__get_user(env->regs[i], sc->sc_a + i);
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}
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/* TODO: xtregs */
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}
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long do_rt_sigreturn(CPUXtensaState *env)
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{
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abi_ulong frame_addr = env->regs[1];
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struct target_rt_sigframe *frame;
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sigset_t set;
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trace_user_do_rt_sigreturn(env, frame_addr);
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if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
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goto badframe;
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}
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target_to_host_sigset(&set, &frame->uc.tuc_sigmask);
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set_sigmask(&set);
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restore_sigcontext(env, frame);
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2021-04-26 05:53:13 +03:00
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target_restore_altstack(&frame->uc.tuc_stack, env);
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2018-04-24 22:26:30 +03:00
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unlock_user_struct(frame, frame_addr, 0);
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return -TARGET_QEMU_ESIGRETURN;
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badframe:
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unlock_user_struct(frame, frame_addr, 0);
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force_sig(TARGET_SIGSEGV);
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return -TARGET_QEMU_ESIGRETURN;
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}
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2021-09-29 16:05:51 +03:00
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void setup_sigtramp(abi_ulong sigtramp_page)
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{
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uint8_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 6, 0);
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assert(tramp != NULL);
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default_rt_sigreturn = sigtramp_page;
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install_sigtramp(tramp);
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unlock_user(tramp, sigtramp_page, 6);
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}
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