xref: /openbmc/qemu/bsd-user/main.c (revision 03ecf078fab7b3ce6fdd373a902211918efeab89)
1 /*
2  *  qemu bsd user main
3  *
4  *  Copyright (c) 2003-2008 Fabrice Bellard
5  *  Copyright (c) 2013-14 Stacey Son
6  *
7  *  This program is free software; you can redistribute it and/or modify
8  *  it under the terms of the GNU General Public License as published by
9  *  the Free Software Foundation; either version 2 of the License, or
10  *  (at your option) any later version.
11  *
12  *  This program is distributed in the hope that it will be useful,
13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *  GNU General Public License for more details.
16  *
17  *  You should have received a copy of the GNU General Public License
18  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
19  */
20 
21 #include <sys/types.h>
22 #include <sys/time.h>
23 #include <sys/resource.h>
24 #include <sys/sysctl.h>
25 
26 #include "qemu/osdep.h"
27 #include "qemu-common.h"
28 #include "qemu/units.h"
29 #include "qemu/accel.h"
30 #include "sysemu/tcg.h"
31 #include "qemu-version.h"
32 #include <machine/trap.h>
33 
34 #include "qapi/error.h"
35 #include "qemu.h"
36 #include "qemu/config-file.h"
37 #include "qemu/error-report.h"
38 #include "qemu/path.h"
39 #include "qemu/help_option.h"
40 #include "qemu/module.h"
41 #include "exec/exec-all.h"
42 #include "tcg/tcg.h"
43 #include "qemu/timer.h"
44 #include "qemu/envlist.h"
45 #include "qemu/cutils.h"
46 #include "exec/log.h"
47 #include "trace/control.h"
48 #include "crypto/init.h"
49 #include "qemu/guest-random.h"
50 
51 #include "host-os.h"
52 #include "target_arch_cpu.h"
53 
54 int singlestep;
55 unsigned long mmap_min_addr;
56 uintptr_t guest_base;
57 bool have_guest_base;
58 unsigned long reserved_va;
59 
60 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
61 const char *qemu_uname_release;
62 enum BSDType bsd_type;
63 char qemu_proc_pathname[PATH_MAX];  /* full path to exeutable */
64 
65 unsigned long target_maxtsiz = TARGET_MAXTSIZ;   /* max text size */
66 unsigned long target_dfldsiz = TARGET_DFLDSIZ;   /* initial data size limit */
67 unsigned long target_maxdsiz = TARGET_MAXDSIZ;   /* max data size */
68 unsigned long target_dflssiz = TARGET_DFLSSIZ;   /* initial data size limit */
69 unsigned long target_maxssiz = TARGET_MAXSSIZ;   /* max stack size */
70 unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */
71 
72 void gemu_log(const char *fmt, ...)
73 {
74     va_list ap;
75 
76     va_start(ap, fmt);
77     vfprintf(stderr, fmt, ap);
78     va_end(ap);
79 }
80 
81 void fork_start(void)
82 {
83 }
84 
85 void fork_end(int child)
86 {
87     if (child) {
88         gdbserver_fork(thread_cpu);
89     }
90 }
91 
92 void cpu_loop(CPUArchState *env)
93 {
94     target_cpu_loop(env);
95 }
96 
97 static void usage(void)
98 {
99     printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
100            "\n" QEMU_COPYRIGHT "\n"
101            "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
102            "BSD CPU emulator (compiled for %s emulation)\n"
103            "\n"
104            "Standard options:\n"
105            "-h                print this help\n"
106            "-g port           wait gdb connection to port\n"
107            "-L path           set the elf interpreter prefix (default=%s)\n"
108            "-s size           set the stack size in bytes (default=%ld)\n"
109            "-cpu model        select CPU (-cpu help for list)\n"
110            "-drop-ld-preload  drop LD_PRELOAD for target process\n"
111            "-E var=value      sets/modifies targets environment variable(s)\n"
112            "-U var            unsets targets environment variable(s)\n"
113            "-B address        set guest_base address to address\n"
114            "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
115            "\n"
116            "Debug options:\n"
117            "-d item1[,...]    enable logging of specified items\n"
118            "                  (use '-d help' for a list of log items)\n"
119            "-D logfile        write logs to 'logfile' (default stderr)\n"
120            "-singlestep       always run in singlestep mode\n"
121            "-strace           log system calls\n"
122            "-trace            [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
123            "                  specify tracing options\n"
124            "\n"
125            "Environment variables:\n"
126            "QEMU_STRACE       Print system calls and arguments similar to the\n"
127            "                  'strace' program.  Enable by setting to any value.\n"
128            "You can use -E and -U options to set/unset environment variables\n"
129            "for target process.  It is possible to provide several variables\n"
130            "by repeating the option.  For example:\n"
131            "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
132            "Note that if you provide several changes to single variable\n"
133            "last change will stay in effect.\n"
134            "\n"
135            QEMU_HELP_BOTTOM "\n"
136            ,
137            TARGET_NAME,
138            interp_prefix,
139            target_dflssiz);
140     exit(1);
141 }
142 
143 __thread CPUState *thread_cpu;
144 
145 bool qemu_cpu_is_self(CPUState *cpu)
146 {
147     return thread_cpu == cpu;
148 }
149 
150 void qemu_cpu_kick(CPUState *cpu)
151 {
152     cpu_exit(cpu);
153 }
154 
155 /* Assumes contents are already zeroed.  */
156 void init_task_state(TaskState *ts)
157 {
158     int i;
159 
160     ts->used = 1;
161     ts->first_free = ts->sigqueue_table;
162     for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
163         ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
164     }
165     ts->sigqueue_table[i].next = NULL;
166 }
167 
168 static void
169 adjust_ssize(void)
170 {
171     struct rlimit rl;
172 
173     if (getrlimit(RLIMIT_STACK, &rl) != 0) {
174         return;
175     }
176 
177     target_maxssiz = MIN(target_maxssiz, rl.rlim_max);
178     target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz);
179 
180     rl.rlim_max = target_maxssiz;
181     rl.rlim_cur = target_dflssiz;
182     setrlimit(RLIMIT_STACK, &rl);
183 }
184 
185 static void save_proc_pathname(char *argv0)
186 {
187     int mib[4];
188     size_t len;
189 
190     mib[0] = CTL_KERN;
191     mib[1] = KERN_PROC;
192     mib[2] = KERN_PROC_PATHNAME;
193     mib[3] = -1;
194 
195     len = sizeof(qemu_proc_pathname);
196     if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) {
197         perror("sysctl");
198     }
199 }
200 
201 int main(int argc, char **argv)
202 {
203     const char *filename;
204     const char *cpu_model;
205     const char *cpu_type;
206     const char *log_file = NULL;
207     const char *log_mask = NULL;
208     const char *seed_optarg = NULL;
209     struct target_pt_regs regs1, *regs = &regs1;
210     struct image_info info1, *info = &info1;
211     struct bsd_binprm bprm;
212     TaskState *ts;
213     CPUArchState *env;
214     CPUState *cpu;
215     int optind, rv;
216     const char *r;
217     const char *gdbstub = NULL;
218     char **target_environ, **wrk;
219     envlist_t *envlist = NULL;
220     bsd_type = HOST_DEFAULT_BSD_TYPE;
221 
222     adjust_ssize();
223 
224     if (argc <= 1) {
225         usage();
226     }
227 
228     save_proc_pathname(argv[0]);
229 
230     error_init(argv[0]);
231     module_call_init(MODULE_INIT_TRACE);
232     qemu_init_cpu_list();
233     module_call_init(MODULE_INIT_QOM);
234 
235     envlist = envlist_create();
236 
237     /* add current environment into the list */
238     for (wrk = environ; *wrk != NULL; wrk++) {
239         (void) envlist_setenv(envlist, *wrk);
240     }
241 
242     cpu_model = NULL;
243 
244     qemu_add_opts(&qemu_trace_opts);
245 
246     optind = 1;
247     for (;;) {
248         if (optind >= argc) {
249             break;
250         }
251         r = argv[optind];
252         if (r[0] != '-') {
253             break;
254         }
255         optind++;
256         r++;
257         if (!strcmp(r, "-")) {
258             break;
259         } else if (!strcmp(r, "d")) {
260             if (optind >= argc) {
261                 break;
262             }
263             log_mask = argv[optind++];
264         } else if (!strcmp(r, "D")) {
265             if (optind >= argc) {
266                 break;
267             }
268             log_file = argv[optind++];
269         } else if (!strcmp(r, "E")) {
270             r = argv[optind++];
271             if (envlist_setenv(envlist, r) != 0) {
272                 usage();
273             }
274         } else if (!strcmp(r, "ignore-environment")) {
275             envlist_free(envlist);
276             envlist = envlist_create();
277         } else if (!strcmp(r, "U")) {
278             r = argv[optind++];
279             if (envlist_unsetenv(envlist, r) != 0) {
280                 usage();
281             }
282         } else if (!strcmp(r, "s")) {
283             r = argv[optind++];
284             rv = qemu_strtoul(r, &r, 0, &target_dflssiz);
285             if (rv < 0 || target_dflssiz <= 0) {
286                 usage();
287             }
288             if (*r == 'M') {
289                 target_dflssiz *= 1024 * 1024;
290             } else if (*r == 'k' || *r == 'K') {
291                 target_dflssiz *= 1024;
292             }
293             if (target_dflssiz > target_maxssiz) {
294                 usage();
295             }
296         } else if (!strcmp(r, "L")) {
297             interp_prefix = argv[optind++];
298         } else if (!strcmp(r, "p")) {
299             qemu_host_page_size = atoi(argv[optind++]);
300             if (qemu_host_page_size == 0 ||
301                 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
302                 fprintf(stderr, "page size must be a power of two\n");
303                 exit(1);
304             }
305         } else if (!strcmp(r, "g")) {
306             gdbstub = g_strdup(argv[optind++]);
307         } else if (!strcmp(r, "r")) {
308             qemu_uname_release = argv[optind++];
309         } else if (!strcmp(r, "cpu")) {
310             cpu_model = argv[optind++];
311             if (is_help_option(cpu_model)) {
312                 /* XXX: implement xxx_cpu_list for targets that still miss it */
313 #if defined(cpu_list)
314                 cpu_list();
315 #endif
316                 exit(1);
317             }
318         } else if (!strcmp(r, "B")) {
319             rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base);
320             if (rv < 0) {
321                 usage();
322             }
323             have_guest_base = true;
324         } else if (!strcmp(r, "drop-ld-preload")) {
325             (void) envlist_unsetenv(envlist, "LD_PRELOAD");
326         } else if (!strcmp(r, "bsd")) {
327             if (!strcasecmp(argv[optind], "freebsd")) {
328                 bsd_type = target_freebsd;
329             } else if (!strcasecmp(argv[optind], "netbsd")) {
330                 bsd_type = target_netbsd;
331             } else if (!strcasecmp(argv[optind], "openbsd")) {
332                 bsd_type = target_openbsd;
333             } else {
334                 usage();
335             }
336             optind++;
337         } else if (!strcmp(r, "seed")) {
338             seed_optarg = optarg;
339         } else if (!strcmp(r, "singlestep")) {
340             singlestep = 1;
341         } else if (!strcmp(r, "strace")) {
342             do_strace = 1;
343         } else if (!strcmp(r, "trace")) {
344             trace_opt_parse(optarg);
345         } else {
346             usage();
347         }
348     }
349 
350     /* init debug */
351     qemu_log_needs_buffers();
352     qemu_set_log_filename(log_file, &error_fatal);
353     if (log_mask) {
354         int mask;
355 
356         mask = qemu_str_to_log_mask(log_mask);
357         if (!mask) {
358             qemu_print_log_usage(stdout);
359             exit(1);
360         }
361         qemu_set_log(mask);
362     }
363 
364     if (optind >= argc) {
365         usage();
366     }
367     filename = argv[optind];
368 
369     if (!trace_init_backends()) {
370         exit(1);
371     }
372     trace_init_file();
373 
374     /* Zero out regs */
375     memset(regs, 0, sizeof(struct target_pt_regs));
376 
377     /* Zero bsd params */
378     memset(&bprm, 0, sizeof(bprm));
379 
380     /* Zero out image_info */
381     memset(info, 0, sizeof(struct image_info));
382 
383     /* Scan interp_prefix dir for replacement files. */
384     init_paths(interp_prefix);
385 
386     if (cpu_model == NULL) {
387         cpu_model = TARGET_DEFAULT_CPU_MODEL;
388     }
389 
390     cpu_type = parse_cpu_option(cpu_model);
391 
392     /* init tcg before creating CPUs and to get qemu_host_page_size */
393     {
394         AccelClass *ac = ACCEL_GET_CLASS(current_accel());
395 
396         accel_init_interfaces(ac);
397         ac->init_machine(NULL);
398     }
399     cpu = cpu_create(cpu_type);
400     env = cpu->env_ptr;
401     cpu_reset(cpu);
402     thread_cpu = cpu;
403 
404     if (getenv("QEMU_STRACE")) {
405         do_strace = 1;
406     }
407 
408     target_environ = envlist_to_environ(envlist, NULL);
409     envlist_free(envlist);
410 
411     {
412         Error *err = NULL;
413         if (seed_optarg != NULL) {
414             qemu_guest_random_seed_main(seed_optarg, &err);
415         } else {
416             qcrypto_init(&err);
417         }
418         if (err) {
419             error_reportf_err(err, "cannot initialize crypto: ");
420             exit(1);
421         }
422     }
423 
424     /*
425      * Now that page sizes are configured we can do
426      * proper page alignment for guest_base.
427      */
428     guest_base = HOST_PAGE_ALIGN(guest_base);
429 
430     if (loader_exec(filename, argv + optind, target_environ, regs, info,
431                     &bprm) != 0) {
432         printf("Error loading %s\n", filename);
433         _exit(1);
434     }
435 
436     for (wrk = target_environ; *wrk; wrk++) {
437         g_free(*wrk);
438     }
439 
440     g_free(target_environ);
441 
442     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
443         qemu_log("guest_base  %p\n", (void *)guest_base);
444         log_page_dump("binary load");
445 
446         qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
447         qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
448         qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n",
449                  info->start_code);
450         qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n",
451                  info->start_data);
452         qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
453         qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n",
454                  info->start_stack);
455         qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
456         qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
457     }
458 
459     /* build Task State */
460     ts = g_new0(TaskState, 1);
461     init_task_state(ts);
462     ts->info = info;
463     ts->bprm = &bprm;
464     cpu->opaque = ts;
465 
466     target_set_brk(info->brk);
467     syscall_init();
468     signal_init();
469 
470     /*
471      * Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
472      * generating the prologue until now so that the prologue can take
473      * the real value of GUEST_BASE into account.
474      */
475     tcg_prologue_init(tcg_ctx);
476 
477     target_cpu_init(env, regs);
478 
479     if (gdbstub) {
480         gdbserver_start(gdbstub);
481         gdb_handlesig(cpu, 0);
482     }
483     cpu_loop(env);
484     /* never exits */
485     return 0;
486 }
487