mirror of https://gitee.com/openkylin/qemu.git
321 lines
9.5 KiB
C
321 lines
9.5 KiB
C
/*
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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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#include "qemu/osdep.h"
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#include "qemu.h"
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#include "signal-common.h"
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#include "linux-user/trace.h"
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#define __NUM_GPRS 16
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#define __NUM_FPRS 16
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#define __NUM_ACRS 16
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#define S390_SYSCALL_SIZE 2
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#define __SIGNAL_FRAMESIZE 160 /* FIXME: 31-bit mode -> 96 */
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#define _SIGCONTEXT_NSIG 64
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#define _SIGCONTEXT_NSIG_BPW 64 /* FIXME: 31-bit mode -> 32 */
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#define _SIGCONTEXT_NSIG_WORDS (_SIGCONTEXT_NSIG / _SIGCONTEXT_NSIG_BPW)
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#define _SIGMASK_COPY_SIZE (sizeof(unsigned long)*_SIGCONTEXT_NSIG_WORDS)
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#define PSW_ADDR_AMODE 0x0000000000000000UL /* 0x80000000UL for 31-bit */
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#define S390_SYSCALL_OPCODE ((uint16_t)0x0a00)
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typedef struct {
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target_psw_t psw;
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target_ulong gprs[__NUM_GPRS];
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unsigned int acrs[__NUM_ACRS];
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} target_s390_regs_common;
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typedef struct {
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unsigned int fpc;
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double fprs[__NUM_FPRS];
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} target_s390_fp_regs;
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typedef struct {
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target_s390_regs_common regs;
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target_s390_fp_regs fpregs;
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} target_sigregs;
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struct target_sigcontext {
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target_ulong oldmask[_SIGCONTEXT_NSIG_WORDS];
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target_sigregs *sregs;
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};
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typedef struct {
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uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
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struct target_sigcontext sc;
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target_sigregs sregs;
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int signo;
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uint8_t retcode[S390_SYSCALL_SIZE];
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} sigframe;
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struct target_ucontext {
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target_ulong tuc_flags;
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struct target_ucontext *tuc_link;
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target_stack_t tuc_stack;
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target_sigregs tuc_mcontext;
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target_sigset_t tuc_sigmask; /* mask last for extensibility */
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};
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typedef struct {
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uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
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uint8_t retcode[S390_SYSCALL_SIZE];
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struct target_siginfo info;
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struct target_ucontext uc;
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} rt_sigframe;
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static inline abi_ulong
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get_sigframe(struct target_sigaction *ka, CPUS390XState *env, size_t frame_size)
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{
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abi_ulong sp;
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/* Default to using normal stack */
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sp = get_sp_from_cpustate(env);
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/* This is the X/Open sanctioned signal stack switching. */
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if (ka->sa_flags & TARGET_SA_ONSTACK) {
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sp = target_sigsp(sp, ka);
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}
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/* This is the legacy signal stack switching. */
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else if (/* FIXME !user_mode(regs) */ 0 &&
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!(ka->sa_flags & TARGET_SA_RESTORER) &&
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ka->sa_restorer) {
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sp = (abi_ulong) ka->sa_restorer;
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}
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return (sp - frame_size) & -8ul;
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}
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static void save_sigregs(CPUS390XState *env, target_sigregs *sregs)
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{
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int i;
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//save_access_regs(current->thread.acrs); FIXME
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/* Copy a 'clean' PSW mask to the user to avoid leaking
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information about whether PER is currently on. */
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__put_user(env->psw.mask, &sregs->regs.psw.mask);
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__put_user(env->psw.addr, &sregs->regs.psw.addr);
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for (i = 0; i < 16; i++) {
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__put_user(env->regs[i], &sregs->regs.gprs[i]);
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}
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for (i = 0; i < 16; i++) {
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__put_user(env->aregs[i], &sregs->regs.acrs[i]);
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}
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/*
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* We have to store the fp registers to current->thread.fp_regs
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* to merge them with the emulated registers.
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*/
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//save_fp_regs(¤t->thread.fp_regs); FIXME
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for (i = 0; i < 16; i++) {
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__put_user(*get_freg(env, i), &sregs->fpregs.fprs[i]);
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}
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}
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void setup_frame(int sig, struct target_sigaction *ka,
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target_sigset_t *set, CPUS390XState *env)
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{
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sigframe *frame;
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abi_ulong frame_addr;
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frame_addr = get_sigframe(ka, env, sizeof(*frame));
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trace_user_setup_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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__put_user(set->sig[0], &frame->sc.oldmask[0]);
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save_sigregs(env, &frame->sregs);
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__put_user((abi_ulong)(unsigned long)&frame->sregs,
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(abi_ulong *)&frame->sc.sregs);
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/* Set up to return from userspace. If provided, use a stub
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already in userspace. */
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if (ka->sa_flags & TARGET_SA_RESTORER) {
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env->regs[14] = (unsigned long)
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ka->sa_restorer | PSW_ADDR_AMODE;
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} else {
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env->regs[14] = (frame_addr + offsetof(sigframe, retcode))
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| PSW_ADDR_AMODE;
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__put_user(S390_SYSCALL_OPCODE | TARGET_NR_sigreturn,
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(uint16_t *)(frame->retcode));
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}
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/* Set up backchain. */
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__put_user(env->regs[15], (abi_ulong *) frame);
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/* Set up registers for signal handler */
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env->regs[15] = frame_addr;
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env->psw.addr = (target_ulong) ka->_sa_handler | PSW_ADDR_AMODE;
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env->regs[2] = sig; //map_signal(sig);
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env->regs[3] = frame_addr += offsetof(typeof(*frame), sc);
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/* We forgot to include these in the sigcontext.
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To avoid breaking binary compatibility, they are passed as args. */
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env->regs[4] = 0; // FIXME: no clue... current->thread.trap_no;
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env->regs[5] = 0; // FIXME: no clue... current->thread.prot_addr;
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/* Place signal number on stack to allow backtrace from handler. */
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__put_user(env->regs[2], &frame->signo);
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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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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, CPUS390XState *env)
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{
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int i;
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rt_sigframe *frame;
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abi_ulong frame_addr;
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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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tswap_siginfo(&frame->info, info);
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/* Create the ucontext. */
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__put_user(0, &frame->uc.tuc_flags);
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__put_user((abi_ulong)0, (abi_ulong *)&frame->uc.tuc_link);
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target_save_altstack(&frame->uc.tuc_stack, env);
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save_sigregs(env, &frame->uc.tuc_mcontext);
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for (i = 0; i < TARGET_NSIG_WORDS; i++) {
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__put_user((abi_ulong)set->sig[i],
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(abi_ulong *)&frame->uc.tuc_sigmask.sig[i]);
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}
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/* Set up to return from userspace. If provided, use a stub
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already in userspace. */
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if (ka->sa_flags & TARGET_SA_RESTORER) {
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env->regs[14] = (unsigned long) ka->sa_restorer | PSW_ADDR_AMODE;
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} else {
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env->regs[14] = (unsigned long) frame->retcode | PSW_ADDR_AMODE;
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__put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn,
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(uint16_t *)(frame->retcode));
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}
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/* Set up backchain. */
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__put_user(env->regs[15], (abi_ulong *) frame);
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/* Set up registers for signal handler */
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env->regs[15] = frame_addr;
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env->psw.addr = (target_ulong) ka->_sa_handler | PSW_ADDR_AMODE;
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env->regs[2] = sig; //map_signal(sig);
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env->regs[3] = frame_addr + offsetof(typeof(*frame), info);
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env->regs[4] = frame_addr + offsetof(typeof(*frame), uc);
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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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static int
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restore_sigregs(CPUS390XState *env, target_sigregs *sc)
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{
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int err = 0;
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int i;
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for (i = 0; i < 16; i++) {
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__get_user(env->regs[i], &sc->regs.gprs[i]);
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}
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__get_user(env->psw.mask, &sc->regs.psw.mask);
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trace_user_s390x_restore_sigregs(env, (unsigned long long)sc->regs.psw.addr,
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(unsigned long long)env->psw.addr);
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__get_user(env->psw.addr, &sc->regs.psw.addr);
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/* FIXME: 31-bit -> | PSW_ADDR_AMODE */
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for (i = 0; i < 16; i++) {
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__get_user(env->aregs[i], &sc->regs.acrs[i]);
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}
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for (i = 0; i < 16; i++) {
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__get_user(*get_freg(env, i), &sc->fpregs.fprs[i]);
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}
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return err;
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}
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long do_sigreturn(CPUS390XState *env)
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{
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sigframe *frame;
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abi_ulong frame_addr = env->regs[15];
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target_sigset_t target_set;
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sigset_t set;
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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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__get_user(target_set.sig[0], &frame->sc.oldmask[0]);
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target_to_host_sigset_internal(&set, &target_set);
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set_sigmask(&set); /* ~_BLOCKABLE? */
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if (restore_sigregs(env, &frame->sregs)) {
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goto badframe;
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}
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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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force_sig(TARGET_SIGSEGV);
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return -TARGET_QEMU_ESIGRETURN;
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}
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long do_rt_sigreturn(CPUS390XState *env)
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{
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rt_sigframe *frame;
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abi_ulong frame_addr = env->regs[15];
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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); /* ~_BLOCKABLE? */
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if (restore_sigregs(env, &frame->uc.tuc_mcontext)) {
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goto badframe;
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}
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if (do_sigaltstack(frame_addr + offsetof(rt_sigframe, uc.tuc_stack), 0,
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get_sp_from_cpustate(env)) == -EFAULT) {
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goto badframe;
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}
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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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