xref: /openbmc/qemu/bsd-user/main.c (revision 312a0b1cbf941c37d3d3aeb1ed651613e04262b5)
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 
49 #include "host-os.h"
50 #include "target_arch_cpu.h"
51 
52 int singlestep;
53 unsigned long mmap_min_addr;
54 uintptr_t guest_base;
55 bool have_guest_base;
56 unsigned long reserved_va;
57 
58 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
59 const char *qemu_uname_release;
60 enum BSDType bsd_type;
61 char qemu_proc_pathname[PATH_MAX];  /* full path to exeutable */
62 
63 unsigned long target_maxtsiz = TARGET_MAXTSIZ;   /* max text size */
64 unsigned long target_dfldsiz = TARGET_DFLDSIZ;   /* initial data size limit */
65 unsigned long target_maxdsiz = TARGET_MAXDSIZ;   /* max data size */
66 unsigned long target_dflssiz = TARGET_DFLSSIZ;   /* initial data size limit */
67 unsigned long target_maxssiz = TARGET_MAXSSIZ;   /* max stack size */
68 unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */
69 
70 void gemu_log(const char *fmt, ...)
71 {
72     va_list ap;
73 
74     va_start(ap, fmt);
75     vfprintf(stderr, fmt, ap);
76     va_end(ap);
77 }
78 
79 void fork_start(void)
80 {
81 }
82 
83 void fork_end(int child)
84 {
85     if (child) {
86         gdbserver_fork(thread_cpu);
87     }
88 }
89 
90 void cpu_loop(CPUArchState *env)
91 {
92     target_cpu_loop(env);
93 }
94 
95 static void usage(void)
96 {
97     printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
98            "\n" QEMU_COPYRIGHT "\n"
99            "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
100            "BSD CPU emulator (compiled for %s emulation)\n"
101            "\n"
102            "Standard options:\n"
103            "-h                print this help\n"
104            "-g port           wait gdb connection to port\n"
105            "-L path           set the elf interpreter prefix (default=%s)\n"
106            "-s size           set the stack size in bytes (default=%ld)\n"
107            "-cpu model        select CPU (-cpu help for list)\n"
108            "-drop-ld-preload  drop LD_PRELOAD for target process\n"
109            "-E var=value      sets/modifies targets environment variable(s)\n"
110            "-U var            unsets targets environment variable(s)\n"
111            "-B address        set guest_base address to address\n"
112            "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
113            "\n"
114            "Debug options:\n"
115            "-d item1[,...]    enable logging of specified items\n"
116            "                  (use '-d help' for a list of log items)\n"
117            "-D logfile        write logs to 'logfile' (default stderr)\n"
118            "-singlestep       always run in singlestep mode\n"
119            "-strace           log system calls\n"
120            "-trace            [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
121            "                  specify tracing options\n"
122            "\n"
123            "Environment variables:\n"
124            "QEMU_STRACE       Print system calls and arguments similar to the\n"
125            "                  'strace' program.  Enable by setting to any value.\n"
126            "You can use -E and -U options to set/unset environment variables\n"
127            "for target process.  It is possible to provide several variables\n"
128            "by repeating the option.  For example:\n"
129            "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
130            "Note that if you provide several changes to single variable\n"
131            "last change will stay in effect.\n"
132            "\n"
133            QEMU_HELP_BOTTOM "\n"
134            ,
135            TARGET_NAME,
136            interp_prefix,
137            target_dflssiz);
138     exit(1);
139 }
140 
141 __thread CPUState *thread_cpu;
142 
143 bool qemu_cpu_is_self(CPUState *cpu)
144 {
145     return thread_cpu == cpu;
146 }
147 
148 void qemu_cpu_kick(CPUState *cpu)
149 {
150     cpu_exit(cpu);
151 }
152 
153 /* Assumes contents are already zeroed.  */
154 void init_task_state(TaskState *ts)
155 {
156     int i;
157 
158     ts->used = 1;
159     ts->first_free = ts->sigqueue_table;
160     for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
161         ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
162     }
163     ts->sigqueue_table[i].next = NULL;
164 }
165 
166 static void
167 adjust_ssize(void)
168 {
169     struct rlimit rl;
170 
171     if (getrlimit(RLIMIT_STACK, &rl) != 0) {
172         return;
173     }
174 
175     target_maxssiz = MIN(target_maxssiz, rl.rlim_max);
176     target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz);
177 
178     rl.rlim_max = target_maxssiz;
179     rl.rlim_cur = target_dflssiz;
180     setrlimit(RLIMIT_STACK, &rl);
181 }
182 
183 static void save_proc_pathname(char *argv0)
184 {
185     int mib[4];
186     size_t len;
187 
188     mib[0] = CTL_KERN;
189     mib[1] = KERN_PROC;
190     mib[2] = KERN_PROC_PATHNAME;
191     mib[3] = -1;
192 
193     len = sizeof(qemu_proc_pathname);
194     if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) {
195         perror("sysctl");
196     }
197 }
198 
199 int main(int argc, char **argv)
200 {
201     const char *filename;
202     const char *cpu_model;
203     const char *cpu_type;
204     const char *log_file = NULL;
205     const char *log_mask = NULL;
206     struct target_pt_regs regs1, *regs = &regs1;
207     struct image_info info1, *info = &info1;
208     struct bsd_binprm bprm;
209     TaskState *ts;
210     CPUArchState *env;
211     CPUState *cpu;
212     int optind, rv;
213     const char *r;
214     const char *gdbstub = NULL;
215     char **target_environ, **wrk;
216     envlist_t *envlist = NULL;
217     bsd_type = HOST_DEFAULT_BSD_TYPE;
218 
219     adjust_ssize();
220 
221     if (argc <= 1) {
222         usage();
223     }
224 
225     save_proc_pathname(argv[0]);
226 
227     error_init(argv[0]);
228     module_call_init(MODULE_INIT_TRACE);
229     qemu_init_cpu_list();
230     module_call_init(MODULE_INIT_QOM);
231 
232     envlist = envlist_create();
233 
234     /* add current environment into the list */
235     for (wrk = environ; *wrk != NULL; wrk++) {
236         (void) envlist_setenv(envlist, *wrk);
237     }
238 
239     cpu_model = NULL;
240 
241     qemu_add_opts(&qemu_trace_opts);
242 
243     optind = 1;
244     for (;;) {
245         if (optind >= argc) {
246             break;
247         }
248         r = argv[optind];
249         if (r[0] != '-') {
250             break;
251         }
252         optind++;
253         r++;
254         if (!strcmp(r, "-")) {
255             break;
256         } else if (!strcmp(r, "d")) {
257             if (optind >= argc) {
258                 break;
259             }
260             log_mask = argv[optind++];
261         } else if (!strcmp(r, "D")) {
262             if (optind >= argc) {
263                 break;
264             }
265             log_file = argv[optind++];
266         } else if (!strcmp(r, "E")) {
267             r = argv[optind++];
268             if (envlist_setenv(envlist, r) != 0) {
269                 usage();
270             }
271         } else if (!strcmp(r, "ignore-environment")) {
272             envlist_free(envlist);
273             envlist = envlist_create();
274         } else if (!strcmp(r, "U")) {
275             r = argv[optind++];
276             if (envlist_unsetenv(envlist, r) != 0) {
277                 usage();
278             }
279         } else if (!strcmp(r, "s")) {
280             r = argv[optind++];
281             rv = qemu_strtoul(r, &r, 0, &target_dflssiz);
282             if (rv < 0 || target_dflssiz <= 0) {
283                 usage();
284             }
285             if (*r == 'M') {
286                 target_dflssiz *= 1024 * 1024;
287             } else if (*r == 'k' || *r == 'K') {
288                 target_dflssiz *= 1024;
289             }
290             if (target_dflssiz > target_maxssiz) {
291                 usage();
292             }
293         } else if (!strcmp(r, "L")) {
294             interp_prefix = argv[optind++];
295         } else if (!strcmp(r, "p")) {
296             qemu_host_page_size = atoi(argv[optind++]);
297             if (qemu_host_page_size == 0 ||
298                 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
299                 fprintf(stderr, "page size must be a power of two\n");
300                 exit(1);
301             }
302         } else if (!strcmp(r, "g")) {
303             gdbstub = g_strdup(argv[optind++]);
304         } else if (!strcmp(r, "r")) {
305             qemu_uname_release = argv[optind++];
306         } else if (!strcmp(r, "cpu")) {
307             cpu_model = argv[optind++];
308             if (is_help_option(cpu_model)) {
309                 /* XXX: implement xxx_cpu_list for targets that still miss it */
310 #if defined(cpu_list)
311                 cpu_list();
312 #endif
313                 exit(1);
314             }
315         } else if (!strcmp(r, "B")) {
316             rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base);
317             if (rv < 0) {
318                 usage();
319             }
320             have_guest_base = true;
321         } else if (!strcmp(r, "drop-ld-preload")) {
322             (void) envlist_unsetenv(envlist, "LD_PRELOAD");
323         } else if (!strcmp(r, "bsd")) {
324             if (!strcasecmp(argv[optind], "freebsd")) {
325                 bsd_type = target_freebsd;
326             } else if (!strcasecmp(argv[optind], "netbsd")) {
327                 bsd_type = target_netbsd;
328             } else if (!strcasecmp(argv[optind], "openbsd")) {
329                 bsd_type = target_openbsd;
330             } else {
331                 usage();
332             }
333             optind++;
334         } else if (!strcmp(r, "singlestep")) {
335             singlestep = 1;
336         } else if (!strcmp(r, "strace")) {
337             do_strace = 1;
338         } else if (!strcmp(r, "trace")) {
339             trace_opt_parse(optarg);
340         } else {
341             usage();
342         }
343     }
344 
345     /* init debug */
346     qemu_log_needs_buffers();
347     qemu_set_log_filename(log_file, &error_fatal);
348     if (log_mask) {
349         int mask;
350 
351         mask = qemu_str_to_log_mask(log_mask);
352         if (!mask) {
353             qemu_print_log_usage(stdout);
354             exit(1);
355         }
356         qemu_set_log(mask);
357     }
358 
359     if (optind >= argc) {
360         usage();
361     }
362     filename = argv[optind];
363 
364     if (!trace_init_backends()) {
365         exit(1);
366     }
367     trace_init_file();
368 
369     /* Zero out regs */
370     memset(regs, 0, sizeof(struct target_pt_regs));
371 
372     /* Zero bsd params */
373     memset(&bprm, 0, sizeof(bprm));
374 
375     /* Zero out image_info */
376     memset(info, 0, sizeof(struct image_info));
377 
378     /* Scan interp_prefix dir for replacement files. */
379     init_paths(interp_prefix);
380 
381     if (cpu_model == NULL) {
382         cpu_model = TARGET_DEFAULT_CPU_MODEL;
383     }
384 
385     cpu_type = parse_cpu_option(cpu_model);
386 
387     /* init tcg before creating CPUs and to get qemu_host_page_size */
388     {
389         AccelClass *ac = ACCEL_GET_CLASS(current_accel());
390 
391         accel_init_interfaces(ac);
392         ac->init_machine(NULL);
393     }
394     cpu = cpu_create(cpu_type);
395     env = cpu->env_ptr;
396     cpu_reset(cpu);
397     thread_cpu = cpu;
398 
399     if (getenv("QEMU_STRACE")) {
400         do_strace = 1;
401     }
402 
403     target_environ = envlist_to_environ(envlist, NULL);
404     envlist_free(envlist);
405 
406     /*
407      * Now that page sizes are configured we can do
408      * proper page alignment for guest_base.
409      */
410     guest_base = HOST_PAGE_ALIGN(guest_base);
411 
412     if (loader_exec(filename, argv + optind, target_environ, regs, info,
413                     &bprm) != 0) {
414         printf("Error loading %s\n", filename);
415         _exit(1);
416     }
417 
418     for (wrk = target_environ; *wrk; wrk++) {
419         g_free(*wrk);
420     }
421 
422     g_free(target_environ);
423 
424     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
425         qemu_log("guest_base  %p\n", (void *)guest_base);
426         log_page_dump("binary load");
427 
428         qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
429         qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
430         qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n",
431                  info->start_code);
432         qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n",
433                  info->start_data);
434         qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
435         qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n",
436                  info->start_stack);
437         qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
438         qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
439     }
440 
441     /* build Task State */
442     ts = g_new0(TaskState, 1);
443     init_task_state(ts);
444     ts->info = info;
445     ts->bprm = &bprm;
446     cpu->opaque = ts;
447 
448     target_set_brk(info->brk);
449     syscall_init();
450     signal_init();
451 
452     /*
453      * Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
454      * generating the prologue until now so that the prologue can take
455      * the real value of GUEST_BASE into account.
456      */
457     tcg_prologue_init(tcg_ctx);
458 
459     target_cpu_init(env, regs);
460 
461     if (gdbstub) {
462         gdbserver_start(gdbstub);
463         gdb_handlesig(cpu, 0);
464     }
465     cpu_loop(env);
466     /* never exits */
467     return 0;
468 }
469