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qemu/linux-user/mips/cpu_loop.c
Peter Maydell b10089a14c linux-user: Don't call gdb_handlesig() before queue_signal() 
The CPU main-loop routines for linux-user generally
call gdb_handlesig() when they're about to queue a
SIGTRAP signal. This is wrong, because queue_signal()
will cause us to pend a signal, and process_pending_signals()
will then call gdb_handlesig() itself. So the effect is that
we notify gdb of the SIGTRAP, and then if gdb says "OK,
continue with signal X" we will incorrectly notify
gdb of the signal X as well. We don't do this double-notify
for anything else, only SIGTRAP.

Remove this unnecessary and incorrect code from all
the targets except for nios2 (whose main loop is
doing something different and broken, and will be handled
in a separate patch).

This bug only manifests if the user responds to the reported
SIGTRAP using "signal SIGFOO" rather than "continue"; since
the latter is the overwhelmingly common thing to do after a
breakpoint most people won't have hit this.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20181019174958.26616-2-peter.maydell@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2018-11-12 15:48:00 +01:00

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/*
* qemu user cpu loop
*
* Copyright (c) 2003-2008 Fabrice Bellard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu.h"
#include "cpu_loop-common.h"
#include "elf.h"
# ifdef TARGET_ABI_MIPSO32
# define MIPS_SYS(name, args) args,
static const uint8_t mips_syscall_args[] = {
MIPS_SYS(sys_syscall , 8) /* 4000 */
MIPS_SYS(sys_exit , 1)
MIPS_SYS(sys_fork , 0)
MIPS_SYS(sys_read , 3)
MIPS_SYS(sys_write , 3)
MIPS_SYS(sys_open , 3) /* 4005 */
MIPS_SYS(sys_close , 1)
MIPS_SYS(sys_waitpid , 3)
MIPS_SYS(sys_creat , 2)
MIPS_SYS(sys_link , 2)
MIPS_SYS(sys_unlink , 1) /* 4010 */
MIPS_SYS(sys_execve , 0)
MIPS_SYS(sys_chdir , 1)
MIPS_SYS(sys_time , 1)
MIPS_SYS(sys_mknod , 3)
MIPS_SYS(sys_chmod , 2) /* 4015 */
MIPS_SYS(sys_lchown , 3)
MIPS_SYS(sys_ni_syscall , 0)
MIPS_SYS(sys_ni_syscall , 0) /* was sys_stat */
MIPS_SYS(sys_lseek , 3)
MIPS_SYS(sys_getpid , 0) /* 4020 */
MIPS_SYS(sys_mount , 5)
MIPS_SYS(sys_umount , 1)
MIPS_SYS(sys_setuid , 1)
MIPS_SYS(sys_getuid , 0)
MIPS_SYS(sys_stime , 1) /* 4025 */
MIPS_SYS(sys_ptrace , 4)
MIPS_SYS(sys_alarm , 1)
MIPS_SYS(sys_ni_syscall , 0) /* was sys_fstat */
MIPS_SYS(sys_pause , 0)
MIPS_SYS(sys_utime , 2) /* 4030 */
MIPS_SYS(sys_ni_syscall , 0)
MIPS_SYS(sys_ni_syscall , 0)
MIPS_SYS(sys_access , 2)
MIPS_SYS(sys_nice , 1)
MIPS_SYS(sys_ni_syscall , 0) /* 4035 */
MIPS_SYS(sys_sync , 0)
MIPS_SYS(sys_kill , 2)
MIPS_SYS(sys_rename , 2)
MIPS_SYS(sys_mkdir , 2)
MIPS_SYS(sys_rmdir , 1) /* 4040 */
MIPS_SYS(sys_dup , 1)
MIPS_SYS(sys_pipe , 0)
MIPS_SYS(sys_times , 1)
MIPS_SYS(sys_ni_syscall , 0)
MIPS_SYS(sys_brk , 1) /* 4045 */
MIPS_SYS(sys_setgid , 1)
MIPS_SYS(sys_getgid , 0)
MIPS_SYS(sys_ni_syscall , 0) /* was signal(2) */
MIPS_SYS(sys_geteuid , 0)
MIPS_SYS(sys_getegid , 0) /* 4050 */
MIPS_SYS(sys_acct , 0)
MIPS_SYS(sys_umount2 , 2)
MIPS_SYS(sys_ni_syscall , 0)
MIPS_SYS(sys_ioctl , 3)
MIPS_SYS(sys_fcntl , 3) /* 4055 */
MIPS_SYS(sys_ni_syscall , 2)
MIPS_SYS(sys_setpgid , 2)
MIPS_SYS(sys_ni_syscall , 0)
MIPS_SYS(sys_olduname , 1)
MIPS_SYS(sys_umask , 1) /* 4060 */
MIPS_SYS(sys_chroot , 1)
MIPS_SYS(sys_ustat , 2)
MIPS_SYS(sys_dup2 , 2)
MIPS_SYS(sys_getppid , 0)
MIPS_SYS(sys_getpgrp , 0) /* 4065 */
MIPS_SYS(sys_setsid , 0)
MIPS_SYS(sys_sigaction , 3)
MIPS_SYS(sys_sgetmask , 0)
MIPS_SYS(sys_ssetmask , 1)
MIPS_SYS(sys_setreuid , 2) /* 4070 */
MIPS_SYS(sys_setregid , 2)
MIPS_SYS(sys_sigsuspend , 0)
MIPS_SYS(sys_sigpending , 1)
MIPS_SYS(sys_sethostname , 2)
MIPS_SYS(sys_setrlimit , 2) /* 4075 */
MIPS_SYS(sys_getrlimit , 2)
MIPS_SYS(sys_getrusage , 2)
MIPS_SYS(sys_gettimeofday, 2)
MIPS_SYS(sys_settimeofday, 2)
MIPS_SYS(sys_getgroups , 2) /* 4080 */
MIPS_SYS(sys_setgroups , 2)
MIPS_SYS(sys_ni_syscall , 0) /* old_select */
MIPS_SYS(sys_symlink , 2)
MIPS_SYS(sys_ni_syscall , 0) /* was sys_lstat */
MIPS_SYS(sys_readlink , 3) /* 4085 */
MIPS_SYS(sys_uselib , 1)
MIPS_SYS(sys_swapon , 2)
MIPS_SYS(sys_reboot , 3)
MIPS_SYS(old_readdir , 3)
MIPS_SYS(old_mmap , 6) /* 4090 */
MIPS_SYS(sys_munmap , 2)
MIPS_SYS(sys_truncate , 2)
MIPS_SYS(sys_ftruncate , 2)
MIPS_SYS(sys_fchmod , 2)
MIPS_SYS(sys_fchown , 3) /* 4095 */
MIPS_SYS(sys_getpriority , 2)
MIPS_SYS(sys_setpriority , 3)
MIPS_SYS(sys_ni_syscall , 0)
MIPS_SYS(sys_statfs , 2)
MIPS_SYS(sys_fstatfs , 2) /* 4100 */
MIPS_SYS(sys_ni_syscall , 0) /* was ioperm(2) */
MIPS_SYS(sys_socketcall , 2)
MIPS_SYS(sys_syslog , 3)
MIPS_SYS(sys_setitimer , 3)
MIPS_SYS(sys_getitimer , 2) /* 4105 */
MIPS_SYS(sys_newstat , 2)
MIPS_SYS(sys_newlstat , 2)
MIPS_SYS(sys_newfstat , 2)
MIPS_SYS(sys_uname , 1)
MIPS_SYS(sys_ni_syscall , 0) /* 4110 was iopl(2) */
MIPS_SYS(sys_vhangup , 0)
MIPS_SYS(sys_ni_syscall , 0) /* was sys_idle() */
MIPS_SYS(sys_ni_syscall , 0) /* was sys_vm86 */
MIPS_SYS(sys_wait4 , 4)
MIPS_SYS(sys_swapoff , 1) /* 4115 */
MIPS_SYS(sys_sysinfo , 1)
MIPS_SYS(sys_ipc , 6)
MIPS_SYS(sys_fsync , 1)
MIPS_SYS(sys_sigreturn , 0)
MIPS_SYS(sys_clone , 6) /* 4120 */
MIPS_SYS(sys_setdomainname, 2)
MIPS_SYS(sys_newuname , 1)
MIPS_SYS(sys_ni_syscall , 0) /* sys_modify_ldt */
MIPS_SYS(sys_adjtimex , 1)
MIPS_SYS(sys_mprotect , 3) /* 4125 */
MIPS_SYS(sys_sigprocmask , 3)
MIPS_SYS(sys_ni_syscall , 0) /* was create_module */
MIPS_SYS(sys_init_module , 5)
MIPS_SYS(sys_delete_module, 1)
MIPS_SYS(sys_ni_syscall , 0) /* 4130 was get_kernel_syms */
MIPS_SYS(sys_quotactl , 0)
MIPS_SYS(sys_getpgid , 1)
MIPS_SYS(sys_fchdir , 1)
MIPS_SYS(sys_bdflush , 2)
MIPS_SYS(sys_sysfs , 3) /* 4135 */
MIPS_SYS(sys_personality , 1)
MIPS_SYS(sys_ni_syscall , 0) /* for afs_syscall */
MIPS_SYS(sys_setfsuid , 1)
MIPS_SYS(sys_setfsgid , 1)
MIPS_SYS(sys_llseek , 5) /* 4140 */
MIPS_SYS(sys_getdents , 3)
MIPS_SYS(sys_select , 5)
MIPS_SYS(sys_flock , 2)
MIPS_SYS(sys_msync , 3)
MIPS_SYS(sys_readv , 3) /* 4145 */
MIPS_SYS(sys_writev , 3)
MIPS_SYS(sys_cacheflush , 3)
MIPS_SYS(sys_cachectl , 3)
MIPS_SYS(sys_sysmips , 4)
MIPS_SYS(sys_ni_syscall , 0) /* 4150 */
MIPS_SYS(sys_getsid , 1)
MIPS_SYS(sys_fdatasync , 0)
MIPS_SYS(sys_sysctl , 1)
MIPS_SYS(sys_mlock , 2)
MIPS_SYS(sys_munlock , 2) /* 4155 */
MIPS_SYS(sys_mlockall , 1)
MIPS_SYS(sys_munlockall , 0)
MIPS_SYS(sys_sched_setparam, 2)
MIPS_SYS(sys_sched_getparam, 2)
MIPS_SYS(sys_sched_setscheduler, 3) /* 4160 */
MIPS_SYS(sys_sched_getscheduler, 1)
MIPS_SYS(sys_sched_yield , 0)
MIPS_SYS(sys_sched_get_priority_max, 1)
MIPS_SYS(sys_sched_get_priority_min, 1)
MIPS_SYS(sys_sched_rr_get_interval, 2) /* 4165 */
MIPS_SYS(sys_nanosleep, 2)
MIPS_SYS(sys_mremap , 5)
MIPS_SYS(sys_accept , 3)
MIPS_SYS(sys_bind , 3)
MIPS_SYS(sys_connect , 3) /* 4170 */
MIPS_SYS(sys_getpeername , 3)
MIPS_SYS(sys_getsockname , 3)
MIPS_SYS(sys_getsockopt , 5)
MIPS_SYS(sys_listen , 2)
MIPS_SYS(sys_recv , 4) /* 4175 */
MIPS_SYS(sys_recvfrom , 6)
MIPS_SYS(sys_recvmsg , 3)
MIPS_SYS(sys_send , 4)
MIPS_SYS(sys_sendmsg , 3)
MIPS_SYS(sys_sendto , 6) /* 4180 */
MIPS_SYS(sys_setsockopt , 5)
MIPS_SYS(sys_shutdown , 2)
MIPS_SYS(sys_socket , 3)
MIPS_SYS(sys_socketpair , 4)
MIPS_SYS(sys_setresuid , 3) /* 4185 */
MIPS_SYS(sys_getresuid , 3)
MIPS_SYS(sys_ni_syscall , 0) /* was sys_query_module */
MIPS_SYS(sys_poll , 3)
MIPS_SYS(sys_nfsservctl , 3)
MIPS_SYS(sys_setresgid , 3) /* 4190 */
MIPS_SYS(sys_getresgid , 3)
MIPS_SYS(sys_prctl , 5)
MIPS_SYS(sys_rt_sigreturn, 0)
MIPS_SYS(sys_rt_sigaction, 4)
MIPS_SYS(sys_rt_sigprocmask, 4) /* 4195 */
MIPS_SYS(sys_rt_sigpending, 2)
MIPS_SYS(sys_rt_sigtimedwait, 4)
MIPS_SYS(sys_rt_sigqueueinfo, 3)
MIPS_SYS(sys_rt_sigsuspend, 0)
MIPS_SYS(sys_pread64 , 6) /* 4200 */
MIPS_SYS(sys_pwrite64 , 6)
MIPS_SYS(sys_chown , 3)
MIPS_SYS(sys_getcwd , 2)
MIPS_SYS(sys_capget , 2)
MIPS_SYS(sys_capset , 2) /* 4205 */
MIPS_SYS(sys_sigaltstack , 2)
MIPS_SYS(sys_sendfile , 4)
MIPS_SYS(sys_ni_syscall , 0)
MIPS_SYS(sys_ni_syscall , 0)
MIPS_SYS(sys_mmap2 , 6) /* 4210 */
MIPS_SYS(sys_truncate64 , 4)
MIPS_SYS(sys_ftruncate64 , 4)
MIPS_SYS(sys_stat64 , 2)
MIPS_SYS(sys_lstat64 , 2)
MIPS_SYS(sys_fstat64 , 2) /* 4215 */
MIPS_SYS(sys_pivot_root , 2)
MIPS_SYS(sys_mincore , 3)
MIPS_SYS(sys_madvise , 3)
MIPS_SYS(sys_getdents64 , 3)
MIPS_SYS(sys_fcntl64 , 3) /* 4220 */
MIPS_SYS(sys_ni_syscall , 0)
MIPS_SYS(sys_gettid , 0)
MIPS_SYS(sys_readahead , 5)
MIPS_SYS(sys_setxattr , 5)
MIPS_SYS(sys_lsetxattr , 5) /* 4225 */
MIPS_SYS(sys_fsetxattr , 5)
MIPS_SYS(sys_getxattr , 4)
MIPS_SYS(sys_lgetxattr , 4)
MIPS_SYS(sys_fgetxattr , 4)
MIPS_SYS(sys_listxattr , 3) /* 4230 */
MIPS_SYS(sys_llistxattr , 3)
MIPS_SYS(sys_flistxattr , 3)
MIPS_SYS(sys_removexattr , 2)
MIPS_SYS(sys_lremovexattr, 2)
MIPS_SYS(sys_fremovexattr, 2) /* 4235 */
MIPS_SYS(sys_tkill , 2)
MIPS_SYS(sys_sendfile64 , 5)
MIPS_SYS(sys_futex , 6)
MIPS_SYS(sys_sched_setaffinity, 3)
MIPS_SYS(sys_sched_getaffinity, 3) /* 4240 */
MIPS_SYS(sys_io_setup , 2)
MIPS_SYS(sys_io_destroy , 1)
MIPS_SYS(sys_io_getevents, 5)
MIPS_SYS(sys_io_submit , 3)
MIPS_SYS(sys_io_cancel , 3) /* 4245 */
MIPS_SYS(sys_exit_group , 1)
MIPS_SYS(sys_lookup_dcookie, 3)
MIPS_SYS(sys_epoll_create, 1)
MIPS_SYS(sys_epoll_ctl , 4)
MIPS_SYS(sys_epoll_wait , 3) /* 4250 */
MIPS_SYS(sys_remap_file_pages, 5)
MIPS_SYS(sys_set_tid_address, 1)
MIPS_SYS(sys_restart_syscall, 0)
MIPS_SYS(sys_fadvise64_64, 7)
MIPS_SYS(sys_statfs64 , 3) /* 4255 */
MIPS_SYS(sys_fstatfs64 , 2)
MIPS_SYS(sys_timer_create, 3)
MIPS_SYS(sys_timer_settime, 4)
MIPS_SYS(sys_timer_gettime, 2)
MIPS_SYS(sys_timer_getoverrun, 1) /* 4260 */
MIPS_SYS(sys_timer_delete, 1)
MIPS_SYS(sys_clock_settime, 2)
MIPS_SYS(sys_clock_gettime, 2)
MIPS_SYS(sys_clock_getres, 2)
MIPS_SYS(sys_clock_nanosleep, 4) /* 4265 */
MIPS_SYS(sys_tgkill , 3)
MIPS_SYS(sys_utimes , 2)
MIPS_SYS(sys_mbind , 4)
MIPS_SYS(sys_ni_syscall , 0) /* sys_get_mempolicy */
MIPS_SYS(sys_ni_syscall , 0) /* 4270 sys_set_mempolicy */
MIPS_SYS(sys_mq_open , 4)
MIPS_SYS(sys_mq_unlink , 1)
MIPS_SYS(sys_mq_timedsend, 5)
MIPS_SYS(sys_mq_timedreceive, 5)
MIPS_SYS(sys_mq_notify , 2) /* 4275 */
MIPS_SYS(sys_mq_getsetattr, 3)
MIPS_SYS(sys_ni_syscall , 0) /* sys_vserver */
MIPS_SYS(sys_waitid , 4)
MIPS_SYS(sys_ni_syscall , 0) /* available, was setaltroot */
MIPS_SYS(sys_add_key , 5)
MIPS_SYS(sys_request_key, 4)
MIPS_SYS(sys_keyctl , 5)
MIPS_SYS(sys_set_thread_area, 1)
MIPS_SYS(sys_inotify_init, 0)
MIPS_SYS(sys_inotify_add_watch, 3) /* 4285 */
MIPS_SYS(sys_inotify_rm_watch, 2)
MIPS_SYS(sys_migrate_pages, 4)
MIPS_SYS(sys_openat, 4)
MIPS_SYS(sys_mkdirat, 3)
MIPS_SYS(sys_mknodat, 4) /* 4290 */
MIPS_SYS(sys_fchownat, 5)
MIPS_SYS(sys_futimesat, 3)
MIPS_SYS(sys_fstatat64, 4)
MIPS_SYS(sys_unlinkat, 3)
MIPS_SYS(sys_renameat, 4) /* 4295 */
MIPS_SYS(sys_linkat, 5)
MIPS_SYS(sys_symlinkat, 3)
MIPS_SYS(sys_readlinkat, 4)
MIPS_SYS(sys_fchmodat, 3)
MIPS_SYS(sys_faccessat, 3) /* 4300 */
MIPS_SYS(sys_pselect6, 6)
MIPS_SYS(sys_ppoll, 5)
MIPS_SYS(sys_unshare, 1)
MIPS_SYS(sys_splice, 6)
MIPS_SYS(sys_sync_file_range, 7) /* 4305 */
MIPS_SYS(sys_tee, 4)
MIPS_SYS(sys_vmsplice, 4)
MIPS_SYS(sys_move_pages, 6)
MIPS_SYS(sys_set_robust_list, 2)
MIPS_SYS(sys_get_robust_list, 3) /* 4310 */
MIPS_SYS(sys_kexec_load, 4)
MIPS_SYS(sys_getcpu, 3)
MIPS_SYS(sys_epoll_pwait, 6)
MIPS_SYS(sys_ioprio_set, 3)
MIPS_SYS(sys_ioprio_get, 2)
MIPS_SYS(sys_utimensat, 4)
MIPS_SYS(sys_signalfd, 3)
MIPS_SYS(sys_ni_syscall, 0) /* was timerfd */
MIPS_SYS(sys_eventfd, 1)
MIPS_SYS(sys_fallocate, 6) /* 4320 */
MIPS_SYS(sys_timerfd_create, 2)
MIPS_SYS(sys_timerfd_gettime, 2)
MIPS_SYS(sys_timerfd_settime, 4)
MIPS_SYS(sys_signalfd4, 4)
MIPS_SYS(sys_eventfd2, 2) /* 4325 */
MIPS_SYS(sys_epoll_create1, 1)
MIPS_SYS(sys_dup3, 3)
MIPS_SYS(sys_pipe2, 2)
MIPS_SYS(sys_inotify_init1, 1)
MIPS_SYS(sys_preadv, 5) /* 4330 */
MIPS_SYS(sys_pwritev, 5)
MIPS_SYS(sys_rt_tgsigqueueinfo, 4)
MIPS_SYS(sys_perf_event_open, 5)
MIPS_SYS(sys_accept4, 4)
MIPS_SYS(sys_recvmmsg, 5) /* 4335 */
MIPS_SYS(sys_fanotify_init, 2)
MIPS_SYS(sys_fanotify_mark, 6)
MIPS_SYS(sys_prlimit64, 4)
MIPS_SYS(sys_name_to_handle_at, 5)
MIPS_SYS(sys_open_by_handle_at, 3) /* 4340 */
MIPS_SYS(sys_clock_adjtime, 2)
MIPS_SYS(sys_syncfs, 1)
MIPS_SYS(sys_sendmmsg, 4)
MIPS_SYS(sys_setns, 2)
MIPS_SYS(sys_process_vm_readv, 6) /* 345 */
MIPS_SYS(sys_process_vm_writev, 6)
MIPS_SYS(sys_kcmp, 5)
MIPS_SYS(sys_finit_module, 3)
MIPS_SYS(sys_sched_setattr, 2)
MIPS_SYS(sys_sched_getattr, 3) /* 350 */
MIPS_SYS(sys_renameat2, 5)
MIPS_SYS(sys_seccomp, 3)
MIPS_SYS(sys_getrandom, 3)
MIPS_SYS(sys_memfd_create, 2)
MIPS_SYS(sys_bpf, 3) /* 355 */
MIPS_SYS(sys_execveat, 5)
MIPS_SYS(sys_userfaultfd, 1)
MIPS_SYS(sys_membarrier, 2)
MIPS_SYS(sys_mlock2, 3)
MIPS_SYS(sys_copy_file_range, 6) /* 360 */
MIPS_SYS(sys_preadv2, 6)
MIPS_SYS(sys_pwritev2, 6)
};
# undef MIPS_SYS
# endif /* O32 */
static int do_store_exclusive(CPUMIPSState *env)
{
target_ulong addr;
target_ulong page_addr;
target_ulong val;
uint32_t val_wp = 0;
uint32_t llnewval_wp = 0;
int flags;
int segv = 0;
int reg;
int d;
int wp;
addr = env->lladdr;
page_addr = addr & TARGET_PAGE_MASK;
start_exclusive();
mmap_lock();
flags = page_get_flags(page_addr);
if ((flags & PAGE_READ) == 0) {
segv = 1;
} else {
reg = env->llreg & 0x1f;
d = (env->llreg & 0x20) != 0;
wp = (env->llreg & 0x40) != 0;
if (!wp) {
if (d) {
segv = get_user_s64(val, addr);
} else {
segv = get_user_s32(val, addr);
}
} else {
segv = get_user_s32(val, addr);
segv |= get_user_s32(val_wp, addr);
llnewval_wp = env->llnewval_wp;
}
if (!segv) {
if (val != env->llval && val_wp == llnewval_wp) {
env->active_tc.gpr[reg] = 0;
} else {
if (!wp) {
if (d) {
segv = put_user_u64(env->llnewval, addr);
} else {
segv = put_user_u32(env->llnewval, addr);
}
} else {
segv = put_user_u32(env->llnewval, addr);
segv |= put_user_u32(env->llnewval_wp, addr + 4);
}
if (!segv) {
env->active_tc.gpr[reg] = 1;
}
}
}
}
env->lladdr = -1;
if (!segv) {
env->active_tc.PC += 4;
}
mmap_unlock();
end_exclusive();
return segv;
}
/* Break codes */
enum {
BRK_OVERFLOW = 6,
BRK_DIVZERO = 7
};
static int do_break(CPUMIPSState *env, target_siginfo_t *info,
unsigned int code)
{
int ret = -1;
switch (code) {
case BRK_OVERFLOW:
case BRK_DIVZERO:
info->si_signo = TARGET_SIGFPE;
info->si_errno = 0;
info->si_code = (code == BRK_OVERFLOW) ? FPE_INTOVF : FPE_INTDIV;
queue_signal(env, info->si_signo, QEMU_SI_FAULT, &*info);
ret = 0;
break;
default:
info->si_signo = TARGET_SIGTRAP;
info->si_errno = 0;
queue_signal(env, info->si_signo, QEMU_SI_FAULT, &*info);
ret = 0;
break;
}
return ret;
}
void cpu_loop(CPUMIPSState *env)
{
CPUState *cs = CPU(mips_env_get_cpu(env));
target_siginfo_t info;
int trapnr;
abi_long ret;
# ifdef TARGET_ABI_MIPSO32
unsigned int syscall_num;
# endif
for(;;) {
cpu_exec_start(cs);
trapnr = cpu_exec(cs);
cpu_exec_end(cs);
process_queued_cpu_work(cs);
switch(trapnr) {
case EXCP_SYSCALL:
env->active_tc.PC += 4;
# ifdef TARGET_ABI_MIPSO32
syscall_num = env->active_tc.gpr[2] - 4000;
if (syscall_num >= sizeof(mips_syscall_args)) {
ret = -TARGET_ENOSYS;
} else {
int nb_args;
abi_ulong sp_reg;
abi_ulong arg5 = 0, arg6 = 0, arg7 = 0, arg8 = 0;
nb_args = mips_syscall_args[syscall_num];
sp_reg = env->active_tc.gpr[29];
switch (nb_args) {
/* these arguments are taken from the stack */
case 8:
if ((ret = get_user_ual(arg8, sp_reg + 28)) != 0) {
goto done_syscall;
}
case 7:
if ((ret = get_user_ual(arg7, sp_reg + 24)) != 0) {
goto done_syscall;
}
case 6:
if ((ret = get_user_ual(arg6, sp_reg + 20)) != 0) {
goto done_syscall;
}
case 5:
if ((ret = get_user_ual(arg5, sp_reg + 16)) != 0) {
goto done_syscall;
}
default:
break;
}
ret = do_syscall(env, env->active_tc.gpr[2],
env->active_tc.gpr[4],
env->active_tc.gpr[5],
env->active_tc.gpr[6],
env->active_tc.gpr[7],
arg5, arg6, arg7, arg8);
}
done_syscall:
# else
ret = do_syscall(env, env->active_tc.gpr[2],
env->active_tc.gpr[4], env->active_tc.gpr[5],
env->active_tc.gpr[6], env->active_tc.gpr[7],
env->active_tc.gpr[8], env->active_tc.gpr[9],
env->active_tc.gpr[10], env->active_tc.gpr[11]);
# endif /* O32 */
if (ret == -TARGET_ERESTARTSYS) {
env->active_tc.PC -= 4;
break;
}
if (ret == -TARGET_QEMU_ESIGRETURN) {
/* Returning from a successful sigreturn syscall.
Avoid clobbering register state. */
break;
}
if ((abi_ulong)ret >= (abi_ulong)-1133) {
env->active_tc.gpr[7] = 1; /* error flag */
ret = -ret;
} else {
env->active_tc.gpr[7] = 0; /* error flag */
}
env->active_tc.gpr[2] = ret;
break;
case EXCP_TLBL:
case EXCP_TLBS:
case EXCP_AdEL:
case EXCP_AdES:
info.si_signo = TARGET_SIGSEGV;
info.si_errno = 0;
/* XXX: check env->error_code */
info.si_code = TARGET_SEGV_MAPERR;
info._sifields._sigfault._addr = env->CP0_BadVAddr;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case EXCP_CpU:
case EXCP_RI:
info.si_signo = TARGET_SIGILL;
info.si_errno = 0;
info.si_code = 0;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
case EXCP_DEBUG:
info.si_signo = TARGET_SIGTRAP;
info.si_errno = 0;
info.si_code = TARGET_TRAP_BRKPT;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
case EXCP_SC:
if (do_store_exclusive(env)) {
info.si_signo = TARGET_SIGSEGV;
info.si_errno = 0;
info.si_code = TARGET_SEGV_MAPERR;
info._sifields._sigfault._addr = env->active_tc.PC;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
}
break;
case EXCP_DSPDIS:
info.si_signo = TARGET_SIGILL;
info.si_errno = 0;
info.si_code = TARGET_ILL_ILLOPC;
queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
break;
/* The code below was inspired by the MIPS Linux kernel trap
* handling code in arch/mips/kernel/traps.c.
*/
case EXCP_BREAK:
{
abi_ulong trap_instr;
unsigned int code;
if (env->hflags & MIPS_HFLAG_M16) {
if (env->insn_flags & ASE_MICROMIPS) {
/* microMIPS mode */
ret = get_user_u16(trap_instr, env->active_tc.PC);
if (ret != 0) {
goto error;
}
if ((trap_instr >> 10) == 0x11) {
/* 16-bit instruction */
code = trap_instr & 0xf;
} else {
/* 32-bit instruction */
abi_ulong instr_lo;
ret = get_user_u16(instr_lo,
env->active_tc.PC + 2);
if (ret != 0) {
goto error;
}
trap_instr = (trap_instr << 16) | instr_lo;
code = ((trap_instr >> 6) & ((1 << 20) - 1));
/* Unfortunately, microMIPS also suffers from
the old assembler bug... */
if (code >= (1 << 10)) {
code >>= 10;
}
}
} else {
/* MIPS16e mode */
ret = get_user_u16(trap_instr, env->active_tc.PC);
if (ret != 0) {
goto error;
}
code = (trap_instr >> 6) & 0x3f;
}
} else {
ret = get_user_u32(trap_instr, env->active_tc.PC);
if (ret != 0) {
goto error;
}
/* As described in the original Linux kernel code, the
* below checks on 'code' are to work around an old
* assembly bug.
*/
code = ((trap_instr >> 6) & ((1 << 20) - 1));
if (code >= (1 << 10)) {
code >>= 10;
}
}
if (do_break(env, &info, code) != 0) {
goto error;
}
}
break;
case EXCP_TRAP:
{
abi_ulong trap_instr;
unsigned int code = 0;
if (env->hflags & MIPS_HFLAG_M16) {
/* microMIPS mode */
abi_ulong instr[2];
ret = get_user_u16(instr[0], env->active_tc.PC) ||
get_user_u16(instr[1], env->active_tc.PC + 2);
trap_instr = (instr[0] << 16) | instr[1];
} else {
ret = get_user_u32(trap_instr, env->active_tc.PC);
}
if (ret != 0) {
goto error;
}
/* The immediate versions don't provide a code. */
if (!(trap_instr & 0xFC000000)) {
if (env->hflags & MIPS_HFLAG_M16) {
/* microMIPS mode */
code = ((trap_instr >> 12) & ((1 << 4) - 1));
} else {
code = ((trap_instr >> 6) & ((1 << 10) - 1));
}
}
if (do_break(env, &info, code) != 0) {
goto error;
}
}
break;
case EXCP_ATOMIC:
cpu_exec_step_atomic(cs);
break;
default:
error:
EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n", trapnr);
abort();
}
process_pending_signals(env);
}
}
void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
{
CPUState *cpu = ENV_GET_CPU(env);
TaskState *ts = cpu->opaque;
struct image_info *info = ts->info;
int i;
struct mode_req {
bool single;
bool soft;
bool fr1;
bool frdefault;
bool fre;
};
static const struct mode_req fpu_reqs[] = {
[MIPS_ABI_FP_ANY] = { true, true, true, true, true },
[MIPS_ABI_FP_DOUBLE] = { false, false, false, true, true },
[MIPS_ABI_FP_SINGLE] = { true, false, false, false, false },
[MIPS_ABI_FP_SOFT] = { false, true, false, false, false },
[MIPS_ABI_FP_OLD_64] = { false, false, false, false, false },
[MIPS_ABI_FP_XX] = { false, false, true, true, true },
[MIPS_ABI_FP_64] = { false, false, true, false, false },
[MIPS_ABI_FP_64A] = { false, false, true, false, true }
};
/*
* Mode requirements when .MIPS.abiflags is not present in the ELF.
* Not present means that everything is acceptable except FR1.
*/
static struct mode_req none_req = { true, true, false, true, true };
struct mode_req prog_req;
struct mode_req interp_req;
for(i = 0; i < 32; i++) {
env->active_tc.gpr[i] = regs->regs[i];
}
env->active_tc.PC = regs->cp0_epc & ~(target_ulong)1;
if (regs->cp0_epc & 1) {
env->hflags |= MIPS_HFLAG_M16;
}
#ifdef TARGET_ABI_MIPSO32
# define MAX_FP_ABI MIPS_ABI_FP_64A
#else
# define MAX_FP_ABI MIPS_ABI_FP_SOFT
#endif
if ((info->fp_abi > MAX_FP_ABI && info->fp_abi != MIPS_ABI_FP_UNKNOWN)
|| (info->interp_fp_abi > MAX_FP_ABI &&
info->interp_fp_abi != MIPS_ABI_FP_UNKNOWN)) {
fprintf(stderr, "qemu: Unexpected FPU mode\n");
exit(1);
}
prog_req = (info->fp_abi == MIPS_ABI_FP_UNKNOWN) ? none_req
: fpu_reqs[info->fp_abi];
interp_req = (info->interp_fp_abi == MIPS_ABI_FP_UNKNOWN) ? none_req
: fpu_reqs[info->interp_fp_abi];
prog_req.single &= interp_req.single;
prog_req.soft &= interp_req.soft;
prog_req.fr1 &= interp_req.fr1;
prog_req.frdefault &= interp_req.frdefault;
prog_req.fre &= interp_req.fre;
bool cpu_has_mips_r2_r6 = env->insn_flags & ISA_MIPS32R2 ||
env->insn_flags & ISA_MIPS64R2 ||
env->insn_flags & ISA_MIPS32R6 ||
env->insn_flags & ISA_MIPS64R6;
if (prog_req.fre && !prog_req.frdefault && !prog_req.fr1) {
env->CP0_Config5 |= (1 << CP0C5_FRE);
if (env->active_fpu.fcr0 & (1 << FCR0_FREP)) {
env->hflags |= MIPS_HFLAG_FRE;
}
} else if ((prog_req.fr1 && prog_req.frdefault) ||
(prog_req.single && !prog_req.frdefault)) {
if ((env->active_fpu.fcr0 & (1 << FCR0_F64)
&& cpu_has_mips_r2_r6) || prog_req.fr1) {
env->CP0_Status |= (1 << CP0St_FR);
env->hflags |= MIPS_HFLAG_F64;
}
} else if (!prog_req.fre && !prog_req.frdefault &&
!prog_req.fr1 && !prog_req.single && !prog_req.soft) {
fprintf(stderr, "qemu: Can't find a matching FPU mode\n");
exit(1);
}
if (env->insn_flags & ISA_NANOMIPS32) {
return;
}
if (((info->elf_flags & EF_MIPS_NAN2008) != 0) !=
((env->active_fpu.fcr31 & (1 << FCR31_NAN2008)) != 0)) {
if ((env->active_fpu.fcr31_rw_bitmask &
(1 << FCR31_NAN2008)) == 0) {
fprintf(stderr, "ELF binary's NaN mode not supported by CPU\n");
exit(1);
}
if ((info->elf_flags & EF_MIPS_NAN2008) != 0) {
env->active_fpu.fcr31 |= (1 << FCR31_NAN2008);
} else {
env->active_fpu.fcr31 &= ~(1 << FCR31_NAN2008);
}
restore_snan_bit_mode(env);
}
}
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