mirror of
https://gitlab.com/qemu-project/qemu.git
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5b6828d194
This reorders some of the calls, deduplicates code between branches and, most importantly, fixes a double end_exclusive call in the parent that will cause exclusive_context_count to go negative. Signed-off-by: Jessica Clarke <jrtc27@jrtc27.com> Pull-Request: https://github.com/qemu-bsd-user/qemu-bsd-user/pull/52 Reviewed-by: Warner Losh <imp@bsdimp.com> Signed-off-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
627 lines
18 KiB
C
627 lines
18 KiB
C
/*
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* qemu bsd user main
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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* Copyright (c) 2013-14 Stacey Son
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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 <sys/resource.h>
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#include <sys/sysctl.h>
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#include "qemu/help-texts.h"
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#include "qemu/units.h"
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#include "qemu/accel.h"
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#include "qemu-version.h"
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#include <machine/trap.h>
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#include "qapi/error.h"
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#include "qemu.h"
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#include "qemu/config-file.h"
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#include "qemu/error-report.h"
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#include "qemu/path.h"
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#include "qemu/help_option.h"
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#include "qemu/module.h"
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#include "qemu/plugin.h"
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#include "exec/exec-all.h"
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#include "user/guest-base.h"
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#include "tcg/startup.h"
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#include "qemu/timer.h"
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#include "qemu/envlist.h"
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#include "qemu/cutils.h"
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#include "exec/log.h"
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#include "trace/control.h"
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#include "crypto/init.h"
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#include "qemu/guest-random.h"
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#include "gdbstub/user.h"
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#include "exec/page-vary.h"
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#include "host-os.h"
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#include "target_arch_cpu.h"
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/*
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* TODO: Remove these and rely only on qemu_real_host_page_size().
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*/
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uintptr_t qemu_host_page_size;
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intptr_t qemu_host_page_mask;
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static bool opt_one_insn_per_tb;
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uintptr_t guest_base;
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bool have_guest_base;
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/*
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* When running 32-on-64 we should make sure we can fit all of the possible
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* guest address space into a contiguous chunk of virtual host memory.
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*
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* This way we will never overlap with our own libraries or binaries or stack
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* or anything else that QEMU maps.
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*
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* Many cpus reserve the high bit (or more than one for some 64-bit cpus)
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* of the address for the kernel. Some cpus rely on this and user space
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* uses the high bit(s) for pointer tagging and the like. For them, we
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* must preserve the expected address space.
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*/
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#ifndef MAX_RESERVED_VA
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# if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
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# if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
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(TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
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# define MAX_RESERVED_VA(CPU) 0xfffffffful
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# else
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# define MAX_RESERVED_VA(CPU) ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1)
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# endif
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# else
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# define MAX_RESERVED_VA(CPU) 0
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# endif
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#endif
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unsigned long reserved_va;
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const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
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const char *qemu_uname_release;
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unsigned long target_maxtsiz = TARGET_MAXTSIZ; /* max text size */
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unsigned long target_dfldsiz = TARGET_DFLDSIZ; /* initial data size limit */
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unsigned long target_maxdsiz = TARGET_MAXDSIZ; /* max data size */
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unsigned long target_dflssiz = TARGET_DFLSSIZ; /* initial data size limit */
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unsigned long target_maxssiz = TARGET_MAXSSIZ; /* max stack size */
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unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */
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/* Helper routines for implementing atomic operations. */
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void fork_start(void)
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{
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start_exclusive();
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mmap_fork_start();
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cpu_list_lock();
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qemu_plugin_user_prefork_lock();
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gdbserver_fork_start();
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}
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void fork_end(pid_t pid)
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{
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bool child = pid == 0;
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qemu_plugin_user_postfork(child);
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mmap_fork_end(child);
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if (child) {
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CPUState *cpu, *next_cpu;
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/*
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* Child processes created by fork() only have a single thread.
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* Discard information about the parent threads.
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*/
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CPU_FOREACH_SAFE(cpu, next_cpu) {
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if (cpu != thread_cpu) {
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QTAILQ_REMOVE_RCU(&cpus_queue, cpu, node);
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}
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}
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qemu_init_cpu_list();
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get_task_state(thread_cpu)->ts_tid = qemu_get_thread_id();
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} else {
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cpu_list_unlock();
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}
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gdbserver_fork_end(thread_cpu, pid);
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/*
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* qemu_init_cpu_list() reinitialized the child exclusive state, but we
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* also need to keep current_cpu consistent, so call end_exclusive() for
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* both child and parent.
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*/
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end_exclusive();
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}
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void cpu_loop(CPUArchState *env)
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{
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target_cpu_loop(env);
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}
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static void usage(void)
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{
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printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
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"\n" QEMU_COPYRIGHT "\n"
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"usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
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"BSD CPU emulator (compiled for %s emulation)\n"
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"\n"
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"Standard options:\n"
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"-h print this help\n"
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"-g port wait gdb connection to port\n"
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"-L path set the elf interpreter prefix (default=%s)\n"
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"-s size set the stack size in bytes (default=%ld)\n"
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"-cpu model select CPU (-cpu help for list)\n"
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"-drop-ld-preload drop LD_PRELOAD for target process\n"
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"-E var=value sets/modifies targets environment variable(s)\n"
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"-U var unsets targets environment variable(s)\n"
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"-B address set guest_base address to address\n"
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"\n"
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"Debug options:\n"
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"-d item1[,...] enable logging of specified items\n"
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" (use '-d help' for a list of log items)\n"
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"-D logfile write logs to 'logfile' (default stderr)\n"
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"-one-insn-per-tb run with one guest instruction per emulated TB\n"
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"-strace log system calls\n"
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"-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
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" specify tracing options\n"
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"\n"
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"Environment variables:\n"
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"QEMU_STRACE Print system calls and arguments similar to the\n"
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" 'strace' program. Enable by setting to any value.\n"
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"You can use -E and -U options to set/unset environment variables\n"
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"for target process. It is possible to provide several variables\n"
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"by repeating the option. For example:\n"
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" -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
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"Note that if you provide several changes to single variable\n"
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"last change will stay in effect.\n"
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"\n"
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QEMU_HELP_BOTTOM "\n"
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,
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TARGET_NAME,
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interp_prefix,
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target_dflssiz);
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exit(1);
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}
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__thread CPUState *thread_cpu;
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void stop_all_tasks(void)
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{
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/*
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* We trust when using NPTL (pthreads) start_exclusive() handles thread
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* stopping correctly.
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*/
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start_exclusive();
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}
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bool qemu_cpu_is_self(CPUState *cpu)
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{
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return thread_cpu == cpu;
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}
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void qemu_cpu_kick(CPUState *cpu)
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{
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cpu_exit(cpu);
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}
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/* Assumes contents are already zeroed. */
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static void init_task_state(TaskState *ts)
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{
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ts->sigaltstack_used = (struct target_sigaltstack) {
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.ss_sp = 0,
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.ss_size = 0,
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.ss_flags = TARGET_SS_DISABLE,
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};
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}
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void gemu_log(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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}
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static void
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adjust_ssize(void)
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{
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struct rlimit rl;
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if (getrlimit(RLIMIT_STACK, &rl) != 0) {
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return;
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}
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target_maxssiz = MIN(target_maxssiz, rl.rlim_max);
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target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz);
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rl.rlim_max = target_maxssiz;
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rl.rlim_cur = target_dflssiz;
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setrlimit(RLIMIT_STACK, &rl);
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}
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int main(int argc, char **argv)
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{
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const char *filename;
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const char *cpu_model;
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const char *cpu_type;
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const char *log_file = NULL;
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const char *log_mask = NULL;
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const char *seed_optarg = NULL;
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struct target_pt_regs regs1, *regs = ®s1;
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struct image_info info1, *info = &info1;
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struct bsd_binprm bprm;
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TaskState *ts;
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CPUArchState *env;
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CPUState *cpu;
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int optind, rv;
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const char *r;
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const char *gdbstub = NULL;
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char **target_environ, **wrk;
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envlist_t *envlist = NULL;
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char *argv0 = NULL;
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int host_page_size;
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unsigned long max_reserved_va;
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adjust_ssize();
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if (argc <= 1) {
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usage();
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}
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error_init(argv[0]);
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module_call_init(MODULE_INIT_TRACE);
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qemu_init_cpu_list();
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module_call_init(MODULE_INIT_QOM);
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envlist = envlist_create();
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/*
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* add current environment into the list
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* envlist_setenv adds to the front of the list; to preserve environ
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* order add from back to front
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*/
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for (wrk = environ; *wrk != NULL; wrk++) {
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continue;
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}
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while (wrk != environ) {
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wrk--;
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(void) envlist_setenv(envlist, *wrk);
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}
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qemu_host_page_size = getpagesize();
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qemu_host_page_size = MAX(qemu_host_page_size, TARGET_PAGE_SIZE);
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cpu_model = NULL;
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qemu_add_opts(&qemu_trace_opts);
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optind = 1;
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for (;;) {
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if (optind >= argc) {
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break;
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}
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r = argv[optind];
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if (r[0] != '-') {
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break;
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}
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optind++;
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r++;
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if (!strcmp(r, "-")) {
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break;
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} else if (!strcmp(r, "d")) {
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if (optind >= argc) {
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break;
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}
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log_mask = argv[optind++];
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} else if (!strcmp(r, "D")) {
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if (optind >= argc) {
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break;
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}
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log_file = argv[optind++];
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} else if (!strcmp(r, "E")) {
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r = argv[optind++];
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if (envlist_setenv(envlist, r) != 0) {
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usage();
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}
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} else if (!strcmp(r, "ignore-environment")) {
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envlist_free(envlist);
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envlist = envlist_create();
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} else if (!strcmp(r, "U")) {
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r = argv[optind++];
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if (envlist_unsetenv(envlist, r) != 0) {
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usage();
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}
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} else if (!strcmp(r, "s")) {
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r = argv[optind++];
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rv = qemu_strtoul(r, &r, 0, &target_dflssiz);
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if (rv < 0 || target_dflssiz <= 0) {
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usage();
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}
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if (*r == 'M') {
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target_dflssiz *= 1024 * 1024;
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} else if (*r == 'k' || *r == 'K') {
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target_dflssiz *= 1024;
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}
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if (target_dflssiz > target_maxssiz) {
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usage();
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}
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} else if (!strcmp(r, "L")) {
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interp_prefix = argv[optind++];
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} else if (!strcmp(r, "p")) {
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unsigned size, want = qemu_real_host_page_size();
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r = argv[optind++];
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if (qemu_strtoui(r, NULL, 10, &size) || size != want) {
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warn_report("Deprecated page size option cannot "
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"change host page size (%u)", want);
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}
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} else if (!strcmp(r, "g")) {
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gdbstub = g_strdup(argv[optind++]);
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} else if (!strcmp(r, "r")) {
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qemu_uname_release = argv[optind++];
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} else if (!strcmp(r, "cpu")) {
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cpu_model = argv[optind++];
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if (is_help_option(cpu_model)) {
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list_cpus();
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exit(1);
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}
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} else if (!strcmp(r, "B")) {
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rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base);
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if (rv < 0) {
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usage();
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}
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have_guest_base = true;
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} else if (!strcmp(r, "drop-ld-preload")) {
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(void) envlist_unsetenv(envlist, "LD_PRELOAD");
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} else if (!strcmp(r, "seed")) {
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seed_optarg = optarg;
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} else if (!strcmp(r, "one-insn-per-tb")) {
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opt_one_insn_per_tb = true;
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} else if (!strcmp(r, "strace")) {
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do_strace = 1;
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} else if (!strcmp(r, "trace")) {
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trace_opt_parse(optarg);
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} else if (!strcmp(r, "0")) {
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argv0 = argv[optind++];
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} else {
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usage();
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}
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}
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qemu_host_page_mask = -qemu_host_page_size;
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/* init debug */
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{
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int mask = 0;
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if (log_mask) {
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mask = qemu_str_to_log_mask(log_mask);
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if (!mask) {
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qemu_print_log_usage(stdout);
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exit(1);
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}
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}
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qemu_set_log_filename_flags(log_file, mask, &error_fatal);
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}
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if (optind >= argc) {
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usage();
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}
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filename = argv[optind];
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if (argv0) {
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argv[optind] = argv0;
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}
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if (!trace_init_backends()) {
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exit(1);
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}
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trace_init_file();
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/* Zero out regs */
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memset(regs, 0, sizeof(struct target_pt_regs));
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/* Zero bsd params */
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memset(&bprm, 0, sizeof(bprm));
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/* Zero out image_info */
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memset(info, 0, sizeof(struct image_info));
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/* Scan interp_prefix dir for replacement files. */
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init_paths(interp_prefix);
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if (cpu_model == NULL) {
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cpu_model = TARGET_DEFAULT_CPU_MODEL;
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}
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cpu_type = parse_cpu_option(cpu_model);
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/* init tcg before creating CPUs and to get qemu_host_page_size */
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{
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AccelState *accel = current_accel();
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AccelClass *ac = ACCEL_GET_CLASS(accel);
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accel_init_interfaces(ac);
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object_property_set_bool(OBJECT(accel), "one-insn-per-tb",
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opt_one_insn_per_tb, &error_abort);
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ac->init_machine(NULL);
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}
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/*
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* Finalize page size before creating CPUs.
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* This will do nothing if !TARGET_PAGE_BITS_VARY.
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* The most efficient setting is to match the host.
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*/
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host_page_size = qemu_real_host_page_size();
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set_preferred_target_page_bits(ctz32(host_page_size));
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finalize_target_page_bits();
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cpu = cpu_create(cpu_type);
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env = cpu_env(cpu);
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cpu_reset(cpu);
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thread_cpu = cpu;
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/*
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* Reserving too much vm space via mmap can run into problems with rlimits,
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* oom due to page table creation, etc. We will still try it, if directed
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* by the command-line option, but not by default. Unless we're running a
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* target address space of 32 or fewer bits on a host with 64 bits.
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*/
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max_reserved_va = MAX_RESERVED_VA(cpu);
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if (reserved_va != 0) {
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if ((reserved_va + 1) % host_page_size) {
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char *s = size_to_str(host_page_size);
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fprintf(stderr, "Reserved virtual address not aligned mod %s\n", s);
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g_free(s);
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exit(EXIT_FAILURE);
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}
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if (max_reserved_va && reserved_va > max_reserved_va) {
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fprintf(stderr, "Reserved virtual address too big\n");
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exit(EXIT_FAILURE);
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}
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} else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) {
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/* MAX_RESERVED_VA + 1 is a large power of 2, so is aligned. */
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reserved_va = max_reserved_va;
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}
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if (getenv("QEMU_STRACE")) {
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do_strace = 1;
|
|
}
|
|
|
|
target_environ = envlist_to_environ(envlist, NULL);
|
|
envlist_free(envlist);
|
|
|
|
{
|
|
Error *err = NULL;
|
|
if (seed_optarg != NULL) {
|
|
qemu_guest_random_seed_main(seed_optarg, &err);
|
|
} else {
|
|
qcrypto_init(&err);
|
|
}
|
|
if (err) {
|
|
error_reportf_err(err, "cannot initialize crypto: ");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now that page sizes are configured we can do
|
|
* proper page alignment for guest_base.
|
|
*/
|
|
if (have_guest_base) {
|
|
if (guest_base & ~qemu_host_page_mask) {
|
|
error_report("Selected guest base not host page aligned");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If reserving host virtual address space, do so now.
|
|
* Combined with '-B', ensure that the chosen range is free.
|
|
*/
|
|
if (reserved_va) {
|
|
void *p;
|
|
|
|
if (have_guest_base) {
|
|
p = mmap((void *)guest_base, reserved_va + 1, PROT_NONE,
|
|
MAP_ANON | MAP_PRIVATE | MAP_FIXED | MAP_EXCL, -1, 0);
|
|
} else {
|
|
p = mmap(NULL, reserved_va + 1, PROT_NONE,
|
|
MAP_ANON | MAP_PRIVATE, -1, 0);
|
|
}
|
|
if (p == MAP_FAILED) {
|
|
const char *err = strerror(errno);
|
|
char *sz = size_to_str(reserved_va + 1);
|
|
|
|
if (have_guest_base) {
|
|
error_report("Cannot allocate %s bytes at -B %p for guest "
|
|
"address space: %s", sz, (void *)guest_base, err);
|
|
} else {
|
|
error_report("Cannot allocate %s bytes for guest "
|
|
"address space: %s", sz, err);
|
|
}
|
|
exit(1);
|
|
}
|
|
guest_base = (uintptr_t)p;
|
|
have_guest_base = true;
|
|
|
|
/* Ensure that mmap_next_start is within range. */
|
|
if (reserved_va <= mmap_next_start) {
|
|
mmap_next_start = (reserved_va / 4 * 3)
|
|
& TARGET_PAGE_MASK & qemu_host_page_mask;
|
|
}
|
|
}
|
|
|
|
if (loader_exec(filename, argv + optind, target_environ, regs, info,
|
|
&bprm) != 0) {
|
|
printf("Error loading %s\n", filename);
|
|
_exit(1);
|
|
}
|
|
|
|
for (wrk = target_environ; *wrk; wrk++) {
|
|
g_free(*wrk);
|
|
}
|
|
|
|
g_free(target_environ);
|
|
|
|
if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
|
|
FILE *f = qemu_log_trylock();
|
|
if (f) {
|
|
fprintf(f, "guest_base %p\n", (void *)guest_base);
|
|
fprintf(f, "page layout changed following binary load\n");
|
|
page_dump(f);
|
|
|
|
fprintf(f, "end_code 0x" TARGET_ABI_FMT_lx "\n",
|
|
info->end_code);
|
|
fprintf(f, "start_code 0x" TARGET_ABI_FMT_lx "\n",
|
|
info->start_code);
|
|
fprintf(f, "start_data 0x" TARGET_ABI_FMT_lx "\n",
|
|
info->start_data);
|
|
fprintf(f, "end_data 0x" TARGET_ABI_FMT_lx "\n",
|
|
info->end_data);
|
|
fprintf(f, "start_stack 0x" TARGET_ABI_FMT_lx "\n",
|
|
info->start_stack);
|
|
fprintf(f, "brk 0x" TARGET_ABI_FMT_lx "\n", info->brk);
|
|
fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n", info->entry);
|
|
|
|
qemu_log_unlock(f);
|
|
}
|
|
}
|
|
|
|
/* build Task State */
|
|
ts = g_new0(TaskState, 1);
|
|
init_task_state(ts);
|
|
ts->info = info;
|
|
ts->bprm = &bprm;
|
|
cpu->opaque = ts;
|
|
|
|
target_set_brk(info->brk);
|
|
syscall_init();
|
|
signal_init();
|
|
|
|
/*
|
|
* Now that we've loaded the binary, GUEST_BASE is fixed. Delay
|
|
* generating the prologue until now so that the prologue can take
|
|
* the real value of GUEST_BASE into account.
|
|
*/
|
|
tcg_prologue_init();
|
|
|
|
target_cpu_init(env, regs);
|
|
|
|
if (gdbstub) {
|
|
gdbserver_start(gdbstub);
|
|
gdb_handlesig(cpu, 0, NULL, NULL, 0);
|
|
}
|
|
cpu_loop(env);
|
|
/* never exits */
|
|
return 0;
|
|
}
|