2018-04-24 21:26:16 +02:00
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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 21:26:33 +02:00
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#include "qemu/osdep.h"
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#include "qemu.h"
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#include "target_signal.h"
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#include "signal-common.h"
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#include "linux-user/trace.h"
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# if defined(TARGET_ABI_MIPSO32)
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struct target_sigcontext {
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uint32_t sc_regmask; /* Unused */
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uint32_t sc_status;
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uint64_t sc_pc;
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uint64_t sc_regs[32];
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uint64_t sc_fpregs[32];
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uint32_t sc_ownedfp; /* Unused */
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uint32_t sc_fpc_csr;
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uint32_t sc_fpc_eir; /* Unused */
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uint32_t sc_used_math;
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uint32_t sc_dsp; /* dsp status, was sc_ssflags */
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uint32_t pad0;
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uint64_t sc_mdhi;
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uint64_t sc_mdlo;
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target_ulong sc_hi1; /* Was sc_cause */
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target_ulong sc_lo1; /* Was sc_badvaddr */
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target_ulong sc_hi2; /* Was sc_sigset[4] */
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target_ulong sc_lo2;
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target_ulong sc_hi3;
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target_ulong sc_lo3;
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};
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# else /* N32 || N64 */
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struct target_sigcontext {
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uint64_t sc_regs[32];
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uint64_t sc_fpregs[32];
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uint64_t sc_mdhi;
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uint64_t sc_hi1;
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uint64_t sc_hi2;
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uint64_t sc_hi3;
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uint64_t sc_mdlo;
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uint64_t sc_lo1;
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uint64_t sc_lo2;
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uint64_t sc_lo3;
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uint64_t sc_pc;
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uint32_t sc_fpc_csr;
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uint32_t sc_used_math;
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uint32_t sc_dsp;
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uint32_t sc_reserved;
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};
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# endif /* O32 */
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struct sigframe {
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uint32_t sf_ass[4]; /* argument save space for o32 */
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uint32_t sf_code[2]; /* signal trampoline */
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struct target_sigcontext sf_sc;
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target_sigset_t sf_mask;
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};
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struct target_ucontext {
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target_ulong tuc_flags;
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target_ulong tuc_link;
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target_stack_t tuc_stack;
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target_ulong pad0;
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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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uint32_t rs_ass[4]; /* argument save space for o32 */
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uint32_t rs_code[2]; /* signal trampoline */
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struct target_siginfo rs_info;
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struct target_ucontext rs_uc;
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};
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/* Install trampoline to jump back from signal handler */
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static inline int install_sigtramp(unsigned int *tramp, unsigned int syscall)
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{
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int err = 0;
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/*
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* Set up the return code ...
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*
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* li v0, __NR__foo_sigreturn
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* syscall
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*/
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__put_user(0x24020000 + syscall, tramp + 0);
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__put_user(0x0000000c , tramp + 1);
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return err;
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}
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static inline void setup_sigcontext(CPUMIPSState *regs,
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struct target_sigcontext *sc)
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{
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int i;
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__put_user(exception_resume_pc(regs), &sc->sc_pc);
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regs->hflags &= ~MIPS_HFLAG_BMASK;
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__put_user(0, &sc->sc_regs[0]);
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for (i = 1; i < 32; ++i) {
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__put_user(regs->active_tc.gpr[i], &sc->sc_regs[i]);
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}
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__put_user(regs->active_tc.HI[0], &sc->sc_mdhi);
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__put_user(regs->active_tc.LO[0], &sc->sc_mdlo);
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/* Rather than checking for dsp existence, always copy. The storage
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would just be garbage otherwise. */
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__put_user(regs->active_tc.HI[1], &sc->sc_hi1);
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__put_user(regs->active_tc.HI[2], &sc->sc_hi2);
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__put_user(regs->active_tc.HI[3], &sc->sc_hi3);
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__put_user(regs->active_tc.LO[1], &sc->sc_lo1);
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__put_user(regs->active_tc.LO[2], &sc->sc_lo2);
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__put_user(regs->active_tc.LO[3], &sc->sc_lo3);
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{
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uint32_t dsp = cpu_rddsp(0x3ff, regs);
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__put_user(dsp, &sc->sc_dsp);
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}
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__put_user(1, &sc->sc_used_math);
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for (i = 0; i < 32; ++i) {
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__put_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i]);
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}
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}
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static inline void
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restore_sigcontext(CPUMIPSState *regs, struct target_sigcontext *sc)
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{
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int i;
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__get_user(regs->CP0_EPC, &sc->sc_pc);
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__get_user(regs->active_tc.HI[0], &sc->sc_mdhi);
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__get_user(regs->active_tc.LO[0], &sc->sc_mdlo);
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for (i = 1; i < 32; ++i) {
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__get_user(regs->active_tc.gpr[i], &sc->sc_regs[i]);
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}
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__get_user(regs->active_tc.HI[1], &sc->sc_hi1);
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__get_user(regs->active_tc.HI[2], &sc->sc_hi2);
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__get_user(regs->active_tc.HI[3], &sc->sc_hi3);
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__get_user(regs->active_tc.LO[1], &sc->sc_lo1);
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__get_user(regs->active_tc.LO[2], &sc->sc_lo2);
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__get_user(regs->active_tc.LO[3], &sc->sc_lo3);
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{
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uint32_t dsp;
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__get_user(dsp, &sc->sc_dsp);
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cpu_wrdsp(dsp, 0x3ff, regs);
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}
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for (i = 0; i < 32; ++i) {
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__get_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i]);
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}
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}
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/*
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* Determine which stack to use..
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*/
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static inline abi_ulong
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get_sigframe(struct target_sigaction *ka, CPUMIPSState *regs, size_t frame_size)
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{
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unsigned long sp;
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/*
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* FPU emulator may have its own trampoline active just
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* above the user stack, 16-bytes before the next lowest
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* 16 byte boundary. Try to avoid trashing it.
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*/
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2018-04-11 21:23:47 +02:00
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sp = target_sigsp(get_sp_from_cpustate(regs) - 32, ka);
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2018-04-24 21:26:33 +02:00
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return (sp - frame_size) & ~7;
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}
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static void mips_set_hflags_isa_mode_from_pc(CPUMIPSState *env)
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{
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if (env->insn_flags & (ASE_MIPS16 | ASE_MICROMIPS)) {
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env->hflags &= ~MIPS_HFLAG_M16;
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env->hflags |= (env->active_tc.PC & 1) << MIPS_HFLAG_M16_SHIFT;
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env->active_tc.PC &= ~(target_ulong) 1;
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}
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}
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# if defined(TARGET_ABI_MIPSO32)
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/* compare linux/arch/mips/kernel/signal.c:setup_frame() */
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void setup_frame(int sig, struct target_sigaction * ka,
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target_sigset_t *set, CPUMIPSState *regs)
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{
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struct sigframe *frame;
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abi_ulong frame_addr;
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int i;
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frame_addr = get_sigframe(ka, regs, sizeof(*frame));
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trace_user_setup_frame(regs, 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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install_sigtramp(frame->sf_code, TARGET_NR_sigreturn);
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setup_sigcontext(regs, &frame->sf_sc);
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for(i = 0; i < TARGET_NSIG_WORDS; i++) {
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__put_user(set->sig[i], &frame->sf_mask.sig[i]);
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}
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/*
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* Arguments to signal handler:
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*
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* a0 = signal number
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* a1 = 0 (should be cause)
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* a2 = pointer to struct sigcontext
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*
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* $25 and PC point to the signal handler, $29 points to the
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* struct sigframe.
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*/
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regs->active_tc.gpr[ 4] = sig;
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regs->active_tc.gpr[ 5] = 0;
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regs->active_tc.gpr[ 6] = frame_addr + offsetof(struct sigframe, sf_sc);
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regs->active_tc.gpr[29] = frame_addr;
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regs->active_tc.gpr[31] = frame_addr + offsetof(struct sigframe, sf_code);
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/* The original kernel code sets CP0_EPC to the handler
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* since it returns to userland using eret
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* we cannot do this here, and we must set PC directly */
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regs->active_tc.PC = regs->active_tc.gpr[25] = ka->_sa_handler;
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mips_set_hflags_isa_mode_from_pc(regs);
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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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}
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long do_sigreturn(CPUMIPSState *regs)
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{
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struct sigframe *frame;
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abi_ulong frame_addr;
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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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frame_addr = regs->active_tc.gpr[29];
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trace_user_do_sigreturn(regs, 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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for(i = 0; i < TARGET_NSIG_WORDS; i++) {
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__get_user(target_set.sig[i], &frame->sf_mask.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(regs, &frame->sf_sc);
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#if 0
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/*
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* Don't let your children do this ...
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*/
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__asm__ __volatile__(
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"move\t$29, %0\n\t"
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"j\tsyscall_exit"
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:/* no outputs */
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:"r" (®s));
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/* Unreached */
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#endif
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regs->active_tc.PC = regs->CP0_EPC;
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mips_set_hflags_isa_mode_from_pc(regs);
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/* I am not sure this is right, but it seems to work
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* maybe a problem with nested signals ? */
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regs->CP0_EPC = 0;
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return -TARGET_QEMU_ESIGRETURN;
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badframe:
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force_sig(TARGET_SIGSEGV);
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return -TARGET_QEMU_ESIGRETURN;
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}
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# endif /* O32 */
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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, CPUMIPSState *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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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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install_sigtramp(frame->rs_code, TARGET_NR_rt_sigreturn);
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tswap_siginfo(&frame->rs_info, info);
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__put_user(0, &frame->rs_uc.tuc_flags);
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__put_user(0, &frame->rs_uc.tuc_link);
|
2018-04-11 21:23:47 +02:00
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target_save_altstack(&frame->rs_uc.tuc_stack, env);
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2018-04-24 21:26:33 +02:00
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setup_sigcontext(env, &frame->rs_uc.tuc_mcontext);
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for(i = 0; i < TARGET_NSIG_WORDS; i++) {
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__put_user(set->sig[i], &frame->rs_uc.tuc_sigmask.sig[i]);
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}
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/*
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* Arguments to signal handler:
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*
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* a0 = signal number
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* a1 = pointer to siginfo_t
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* a2 = pointer to ucontext_t
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*
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* $25 and PC point to the signal handler, $29 points to the
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* struct sigframe.
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*/
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env->active_tc.gpr[ 4] = sig;
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env->active_tc.gpr[ 5] = frame_addr
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+ offsetof(struct target_rt_sigframe, rs_info);
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env->active_tc.gpr[ 6] = frame_addr
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+ offsetof(struct target_rt_sigframe, rs_uc);
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env->active_tc.gpr[29] = frame_addr;
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env->active_tc.gpr[31] = frame_addr
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+ offsetof(struct target_rt_sigframe, rs_code);
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/* The original kernel code sets CP0_EPC to the handler
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* since it returns to userland using eret
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* we cannot do this here, and we must set PC directly */
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env->active_tc.PC = env->active_tc.gpr[25] = ka->_sa_handler;
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|
mips_set_hflags_isa_mode_from_pc(env);
|
|
|
|
unlock_user_struct(frame, frame_addr, 1);
|
|
|
|
return;
|
|
|
|
|
|
|
|
give_sigsegv:
|
|
|
|
unlock_user_struct(frame, frame_addr, 1);
|
|
|
|
force_sigsegv(sig);
|
|
|
|
}
|
|
|
|
|
|
|
|
long do_rt_sigreturn(CPUMIPSState *env)
|
|
|
|
{
|
|
|
|
struct target_rt_sigframe *frame;
|
|
|
|
abi_ulong frame_addr;
|
|
|
|
sigset_t blocked;
|
|
|
|
|
|
|
|
frame_addr = env->active_tc.gpr[29];
|
|
|
|
trace_user_do_rt_sigreturn(env, frame_addr);
|
|
|
|
if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
|
|
|
|
goto badframe;
|
|
|
|
}
|
|
|
|
|
|
|
|
target_to_host_sigset(&blocked, &frame->rs_uc.tuc_sigmask);
|
|
|
|
set_sigmask(&blocked);
|
|
|
|
|
|
|
|
restore_sigcontext(env, &frame->rs_uc.tuc_mcontext);
|
|
|
|
|
|
|
|
if (do_sigaltstack(frame_addr +
|
|
|
|
offsetof(struct target_rt_sigframe, rs_uc.tuc_stack),
|
|
|
|
0, get_sp_from_cpustate(env)) == -EFAULT)
|
|
|
|
goto badframe;
|
|
|
|
|
|
|
|
env->active_tc.PC = env->CP0_EPC;
|
|
|
|
mips_set_hflags_isa_mode_from_pc(env);
|
|
|
|
/* I am not sure this is right, but it seems to work
|
|
|
|
* maybe a problem with nested signals ? */
|
|
|
|
env->CP0_EPC = 0;
|
|
|
|
return -TARGET_QEMU_ESIGRETURN;
|
|
|
|
|
|
|
|
badframe:
|
|
|
|
force_sig(TARGET_SIGSEGV);
|
|
|
|
return -TARGET_QEMU_ESIGRETURN;
|
|
|
|
}
|