2021-02-08 08:46:20 +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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* Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
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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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#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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2021-02-08 08:46:20 +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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target_ulong r0, r1, r2, r3;
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target_ulong r4, r5, r6, r7;
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target_ulong r8, r9, r10, r11;
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target_ulong r12, r13, r14, r15;
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target_ulong r16, r17, r18, r19;
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target_ulong r20, r21, r22, r23;
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target_ulong r24, r25, r26, r27;
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target_ulong r28, r29, r30, r31;
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target_ulong sa0;
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target_ulong lc0;
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target_ulong sa1;
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target_ulong lc1;
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target_ulong m0;
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target_ulong m1;
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target_ulong usr;
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target_ulong p3_0;
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target_ulong gp;
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target_ulong ugp;
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target_ulong pc;
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target_ulong cause;
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target_ulong badva;
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target_ulong pad1;
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target_ulong pad2;
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target_ulong pad3;
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};
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struct target_ucontext {
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unsigned long uc_flags;
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target_ulong uc_link; /* target pointer */
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target_stack_t uc_stack;
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struct target_sigcontext uc_mcontext;
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target_sigset_t uc_sigmask;
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};
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struct target_rt_sigframe {
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uint32_t tramp[2];
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struct target_siginfo info;
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struct target_ucontext uc;
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};
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static abi_ulong get_sigframe(struct target_sigaction *ka,
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CPUHexagonState *regs, size_t framesize)
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{
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abi_ulong sp = get_sp_from_cpustate(regs);
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/* This is the X/Open sanctioned signal stack switching. */
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sp = target_sigsp(sp, ka) - framesize;
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sp = QEMU_ALIGN_DOWN(sp, 8);
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return sp;
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}
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static void setup_sigcontext(struct target_sigcontext *sc, CPUHexagonState *env)
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{
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__put_user(env->gpr[HEX_REG_R00], &sc->r0);
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__put_user(env->gpr[HEX_REG_R01], &sc->r1);
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__put_user(env->gpr[HEX_REG_R02], &sc->r2);
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__put_user(env->gpr[HEX_REG_R03], &sc->r3);
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__put_user(env->gpr[HEX_REG_R04], &sc->r4);
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__put_user(env->gpr[HEX_REG_R05], &sc->r5);
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__put_user(env->gpr[HEX_REG_R06], &sc->r6);
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__put_user(env->gpr[HEX_REG_R07], &sc->r7);
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__put_user(env->gpr[HEX_REG_R08], &sc->r8);
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__put_user(env->gpr[HEX_REG_R09], &sc->r9);
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__put_user(env->gpr[HEX_REG_R10], &sc->r10);
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__put_user(env->gpr[HEX_REG_R11], &sc->r11);
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__put_user(env->gpr[HEX_REG_R12], &sc->r12);
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__put_user(env->gpr[HEX_REG_R13], &sc->r13);
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__put_user(env->gpr[HEX_REG_R14], &sc->r14);
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__put_user(env->gpr[HEX_REG_R15], &sc->r15);
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__put_user(env->gpr[HEX_REG_R16], &sc->r16);
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__put_user(env->gpr[HEX_REG_R17], &sc->r17);
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__put_user(env->gpr[HEX_REG_R18], &sc->r18);
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__put_user(env->gpr[HEX_REG_R19], &sc->r19);
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__put_user(env->gpr[HEX_REG_R20], &sc->r20);
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__put_user(env->gpr[HEX_REG_R21], &sc->r21);
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__put_user(env->gpr[HEX_REG_R22], &sc->r22);
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__put_user(env->gpr[HEX_REG_R23], &sc->r23);
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__put_user(env->gpr[HEX_REG_R24], &sc->r24);
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__put_user(env->gpr[HEX_REG_R25], &sc->r25);
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__put_user(env->gpr[HEX_REG_R26], &sc->r26);
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__put_user(env->gpr[HEX_REG_R27], &sc->r27);
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__put_user(env->gpr[HEX_REG_R28], &sc->r28);
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__put_user(env->gpr[HEX_REG_R29], &sc->r29);
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__put_user(env->gpr[HEX_REG_R30], &sc->r30);
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__put_user(env->gpr[HEX_REG_R31], &sc->r31);
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__put_user(env->gpr[HEX_REG_SA0], &sc->sa0);
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__put_user(env->gpr[HEX_REG_LC0], &sc->lc0);
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__put_user(env->gpr[HEX_REG_SA1], &sc->sa1);
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__put_user(env->gpr[HEX_REG_LC1], &sc->lc1);
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__put_user(env->gpr[HEX_REG_M0], &sc->m0);
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__put_user(env->gpr[HEX_REG_M1], &sc->m1);
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__put_user(env->gpr[HEX_REG_USR], &sc->usr);
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__put_user(env->gpr[HEX_REG_P3_0], &sc->p3_0);
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__put_user(env->gpr[HEX_REG_GP], &sc->gp);
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__put_user(env->gpr[HEX_REG_UGP], &sc->ugp);
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__put_user(env->gpr[HEX_REG_PC], &sc->pc);
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}
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static void setup_ucontext(struct target_ucontext *uc,
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CPUHexagonState *env, target_sigset_t *set)
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{
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__put_user(0, &(uc->uc_flags));
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__put_user(0, &(uc->uc_link));
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target_save_altstack(&uc->uc_stack, env);
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int i;
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for (i = 0; i < TARGET_NSIG_WORDS; i++) {
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__put_user(set->sig[i], &(uc->uc_sigmask.sig[i]));
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}
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setup_sigcontext(&uc->uc_mcontext, env);
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}
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static inline void install_sigtramp(uint32_t *tramp)
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{
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__put_user(0x7800d166, tramp + 0); /* { r6=#__NR_rt_sigreturn } */
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__put_user(0x5400c004, tramp + 1); /* { trap0(#1) } */
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}
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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, CPUHexagonState *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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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 badframe;
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}
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setup_ucontext(&frame->uc, env, set);
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tswap_siginfo(&frame->info, info);
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2021-09-29 16:05:35 +03:00
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/*
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* The on-stack signal trampoline is no longer executed;
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* however, the libgcc signal frame unwinding code checks
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* for the presence of these two numeric magic values.
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*/
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2021-02-08 08:46:20 +03:00
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install_sigtramp(frame->tramp);
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env->gpr[HEX_REG_PC] = ka->_sa_handler;
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env->gpr[HEX_REG_SP] = frame_addr;
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env->gpr[HEX_REG_R00] = sig;
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env->gpr[HEX_REG_R01] =
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frame_addr + offsetof(struct target_rt_sigframe, info);
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env->gpr[HEX_REG_R02] =
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frame_addr + offsetof(struct target_rt_sigframe, uc);
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2021-09-29 16:05:35 +03:00
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env->gpr[HEX_REG_LR] = default_rt_sigreturn;
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2021-02-08 08:46:20 +03:00
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return;
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badframe:
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unlock_user_struct(frame, frame_addr, 1);
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if (sig == TARGET_SIGSEGV) {
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ka->_sa_handler = TARGET_SIG_DFL;
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}
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force_sig(TARGET_SIGSEGV);
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}
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static void restore_sigcontext(CPUHexagonState *env,
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struct target_sigcontext *sc)
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{
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__get_user(env->gpr[HEX_REG_R00], &sc->r0);
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__get_user(env->gpr[HEX_REG_R01], &sc->r1);
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__get_user(env->gpr[HEX_REG_R02], &sc->r2);
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__get_user(env->gpr[HEX_REG_R03], &sc->r3);
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__get_user(env->gpr[HEX_REG_R04], &sc->r4);
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__get_user(env->gpr[HEX_REG_R05], &sc->r5);
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__get_user(env->gpr[HEX_REG_R06], &sc->r6);
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__get_user(env->gpr[HEX_REG_R07], &sc->r7);
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__get_user(env->gpr[HEX_REG_R08], &sc->r8);
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__get_user(env->gpr[HEX_REG_R09], &sc->r9);
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__get_user(env->gpr[HEX_REG_R10], &sc->r10);
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__get_user(env->gpr[HEX_REG_R11], &sc->r11);
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__get_user(env->gpr[HEX_REG_R12], &sc->r12);
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__get_user(env->gpr[HEX_REG_R13], &sc->r13);
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__get_user(env->gpr[HEX_REG_R14], &sc->r14);
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__get_user(env->gpr[HEX_REG_R15], &sc->r15);
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__get_user(env->gpr[HEX_REG_R16], &sc->r16);
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__get_user(env->gpr[HEX_REG_R17], &sc->r17);
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__get_user(env->gpr[HEX_REG_R18], &sc->r18);
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__get_user(env->gpr[HEX_REG_R19], &sc->r19);
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__get_user(env->gpr[HEX_REG_R20], &sc->r20);
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__get_user(env->gpr[HEX_REG_R21], &sc->r21);
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__get_user(env->gpr[HEX_REG_R22], &sc->r22);
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__get_user(env->gpr[HEX_REG_R23], &sc->r23);
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__get_user(env->gpr[HEX_REG_R24], &sc->r24);
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__get_user(env->gpr[HEX_REG_R25], &sc->r25);
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__get_user(env->gpr[HEX_REG_R26], &sc->r26);
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__get_user(env->gpr[HEX_REG_R27], &sc->r27);
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__get_user(env->gpr[HEX_REG_R28], &sc->r28);
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__get_user(env->gpr[HEX_REG_R29], &sc->r29);
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__get_user(env->gpr[HEX_REG_R30], &sc->r30);
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__get_user(env->gpr[HEX_REG_R31], &sc->r31);
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__get_user(env->gpr[HEX_REG_SA0], &sc->sa0);
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__get_user(env->gpr[HEX_REG_LC0], &sc->lc0);
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__get_user(env->gpr[HEX_REG_SA1], &sc->sa1);
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__get_user(env->gpr[HEX_REG_LC1], &sc->lc1);
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__get_user(env->gpr[HEX_REG_M0], &sc->m0);
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__get_user(env->gpr[HEX_REG_M1], &sc->m1);
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__get_user(env->gpr[HEX_REG_USR], &sc->usr);
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__get_user(env->gpr[HEX_REG_P3_0], &sc->p3_0);
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__get_user(env->gpr[HEX_REG_GP], &sc->gp);
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__get_user(env->gpr[HEX_REG_UGP], &sc->ugp);
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__get_user(env->gpr[HEX_REG_PC], &sc->pc);
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}
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static void restore_ucontext(CPUHexagonState *env, struct target_ucontext *uc)
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{
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sigset_t blocked;
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target_sigset_t target_set;
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int i;
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target_sigemptyset(&target_set);
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for (i = 0; i < TARGET_NSIG_WORDS; i++) {
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__get_user(target_set.sig[i], &(uc->uc_sigmask.sig[i]));
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}
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target_to_host_sigset_internal(&blocked, &target_set);
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set_sigmask(&blocked);
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restore_sigcontext(env, &uc->uc_mcontext);
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}
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long do_rt_sigreturn(CPUHexagonState *env)
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{
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struct target_rt_sigframe *frame;
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abi_ulong frame_addr;
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frame_addr = env->gpr[HEX_REG_SP];
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trace_user_do_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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restore_ucontext(env, &frame->uc);
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2021-04-26 05:53:13 +03:00
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target_restore_altstack(&frame->uc.uc_stack, env);
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2021-02-08 08:46:20 +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 0;
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}
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2021-09-29 16:05:35 +03:00
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void setup_sigtramp(abi_ulong sigtramp_page)
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{
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uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 4 * 2, 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, 4 * 2);
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}
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