Preliminary BSD user emulator support
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5544 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/bsd-user/main.c b/bsd-user/main.c
new file mode 100644
index 0000000..d2129cc
--- /dev/null
+++ b/bsd-user/main.c
@@ -0,0 +1,576 @@
+/*
+ * qemu user main
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <machine/trap.h>
+
+#include "qemu.h"
+#include "qemu-common.h"
+/* For tb_lock */
+#include "exec-all.h"
+
+#define DEBUG_LOGFILE "/tmp/qemu.log"
+
+static const char *interp_prefix = CONFIG_QEMU_PREFIX;
+const char *qemu_uname_release = CONFIG_UNAME_RELEASE;
+extern char **environ;
+
+/* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
+ we allocate a bigger stack. Need a better solution, for example
+ by remapping the process stack directly at the right place */
+unsigned long x86_stack_size = 512 * 1024;
+
+void gemu_log(const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+}
+#ifdef TARGET_SPARC
+#define SPARC64_STACK_BIAS 2047
+
+//#define DEBUG_WIN
+/* WARNING: dealing with register windows _is_ complicated. More info
+ can be found at http://www.sics.se/~psm/sparcstack.html */
+static inline int get_reg_index(CPUSPARCState *env, int cwp, int index)
+{
+ index = (index + cwp * 16) % (16 * env->nwindows);
+ /* wrap handling : if cwp is on the last window, then we use the
+ registers 'after' the end */
+ if (index < 8 && env->cwp == env->nwindows - 1)
+ index += 16 * env->nwindows;
+ return index;
+}
+
+/* save the register window 'cwp1' */
+static inline void save_window_offset(CPUSPARCState *env, int cwp1)
+{
+ unsigned int i;
+ abi_ulong sp_ptr;
+
+ sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
+#ifdef TARGET_SPARC64
+ if (sp_ptr & 3)
+ sp_ptr += SPARC64_STACK_BIAS;
+#endif
+#if defined(DEBUG_WIN)
+ printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n",
+ sp_ptr, cwp1);
+#endif
+ for(i = 0; i < 16; i++) {
+ /* FIXME - what to do if put_user() fails? */
+ put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
+ sp_ptr += sizeof(abi_ulong);
+ }
+}
+
+static void save_window(CPUSPARCState *env)
+{
+#ifndef TARGET_SPARC64
+ unsigned int new_wim;
+ new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) &
+ ((1LL << env->nwindows) - 1);
+ save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
+ env->wim = new_wim;
+#else
+ save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
+ env->cansave++;
+ env->canrestore--;
+#endif
+}
+
+static void restore_window(CPUSPARCState *env)
+{
+#ifndef TARGET_SPARC64
+ unsigned int new_wim;
+#endif
+ unsigned int i, cwp1;
+ abi_ulong sp_ptr;
+
+#ifndef TARGET_SPARC64
+ new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) &
+ ((1LL << env->nwindows) - 1);
+#endif
+
+ /* restore the invalid window */
+ cwp1 = cpu_cwp_inc(env, env->cwp + 1);
+ sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
+#ifdef TARGET_SPARC64
+ if (sp_ptr & 3)
+ sp_ptr += SPARC64_STACK_BIAS;
+#endif
+#if defined(DEBUG_WIN)
+ printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n",
+ sp_ptr, cwp1);
+#endif
+ for(i = 0; i < 16; i++) {
+ /* FIXME - what to do if get_user() fails? */
+ get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
+ sp_ptr += sizeof(abi_ulong);
+ }
+#ifdef TARGET_SPARC64
+ env->canrestore++;
+ if (env->cleanwin < env->nwindows - 1)
+ env->cleanwin++;
+ env->cansave--;
+#else
+ env->wim = new_wim;
+#endif
+}
+
+static void flush_windows(CPUSPARCState *env)
+{
+ int offset, cwp1;
+
+ offset = 1;
+ for(;;) {
+ /* if restore would invoke restore_window(), then we can stop */
+ cwp1 = cpu_cwp_inc(env, env->cwp + offset);
+#ifndef TARGET_SPARC64
+ if (env->wim & (1 << cwp1))
+ break;
+#else
+ if (env->canrestore == 0)
+ break;
+ env->cansave++;
+ env->canrestore--;
+#endif
+ save_window_offset(env, cwp1);
+ offset++;
+ }
+ cwp1 = cpu_cwp_inc(env, env->cwp + 1);
+#ifndef TARGET_SPARC64
+ /* set wim so that restore will reload the registers */
+ env->wim = 1 << cwp1;
+#endif
+#if defined(DEBUG_WIN)
+ printf("flush_windows: nb=%d\n", offset - 1);
+#endif
+}
+
+void cpu_loop(CPUSPARCState *env, enum BSDType bsd_type)
+{
+ int trapnr, ret, syscall_nr;
+ //target_siginfo_t info;
+
+ while (1) {
+ trapnr = cpu_sparc_exec (env);
+
+ switch (trapnr) {
+ case 0x100:
+ syscall_nr = env->gregs[1];
+#if defined(TARGET_SPARC)
+ syscall_nr &= ~(SYSCALL_G7RFLAG | SYSCALL_G2RFLAG);
+#endif
+ if (bsd_type == target_freebsd)
+ ret = do_freebsd_syscall(env, syscall_nr,
+ env->regwptr[0], env->regwptr[1],
+ env->regwptr[2], env->regwptr[3],
+ env->regwptr[4], env->regwptr[5]);
+ else if (bsd_type == target_netbsd)
+ ret = do_netbsd_syscall(env, syscall_nr,
+ env->regwptr[0], env->regwptr[1],
+ env->regwptr[2], env->regwptr[3],
+ env->regwptr[4], env->regwptr[5]);
+ else //if (bsd_type == target_openbsd)
+ ret = do_openbsd_syscall(env, syscall_nr,
+ env->regwptr[0], env->regwptr[1],
+ env->regwptr[2], env->regwptr[3],
+ env->regwptr[4], env->regwptr[5]);
+ if ((unsigned int)ret >= (unsigned int)(-515)) {
+#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
+ env->xcc |= PSR_CARRY;
+#else
+ env->psr |= PSR_CARRY;
+#endif
+ } else {
+#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
+ env->xcc &= ~PSR_CARRY;
+#else
+ env->psr &= ~PSR_CARRY;
+#endif
+ }
+ env->regwptr[0] = ret;
+ /* next instruction */
+#if defined(TARGET_SPARC)
+ if (env->gregs[1] & SYSCALL_G2RFLAG) {
+ env->pc = env->gregs[2];
+ env->npc = env->pc + 4;
+ } else if (env->gregs[1] & SYSCALL_G7RFLAG) {
+ env->pc = env->gregs[7];
+ env->npc = env->pc + 4;
+ } else {
+ env->pc = env->npc;
+ env->npc = env->npc + 4;
+ }
+#else
+ env->pc = env->npc;
+ env->npc = env->npc + 4;
+#endif
+ break;
+ case 0x83: /* flush windows */
+#ifdef TARGET_ABI32
+ case 0x103:
+#endif
+ flush_windows(env);
+ /* next instruction */
+ env->pc = env->npc;
+ env->npc = env->npc + 4;
+ break;
+#ifndef TARGET_SPARC64
+ case TT_WIN_OVF: /* window overflow */
+ save_window(env);
+ break;
+ case TT_WIN_UNF: /* window underflow */
+ restore_window(env);
+ break;
+ case TT_TFAULT:
+ case TT_DFAULT:
+#if 0
+ {
+ info.si_signo = SIGSEGV;
+ info.si_errno = 0;
+ /* XXX: check env->error_code */
+ info.si_code = TARGET_SEGV_MAPERR;
+ info._sifields._sigfault._addr = env->mmuregs[4];
+ queue_signal(env, info.si_signo, &info);
+ }
+#endif
+ break;
+#else
+ case TT_SPILL: /* window overflow */
+ save_window(env);
+ break;
+ case TT_FILL: /* window underflow */
+ restore_window(env);
+ break;
+ case TT_TFAULT:
+ case TT_DFAULT:
+#if 0
+ {
+ info.si_signo = SIGSEGV;
+ info.si_errno = 0;
+ /* XXX: check env->error_code */
+ info.si_code = TARGET_SEGV_MAPERR;
+ if (trapnr == TT_DFAULT)
+ info._sifields._sigfault._addr = env->dmmuregs[4];
+ else
+ info._sifields._sigfault._addr = env->tsptr->tpc;
+ //queue_signal(env, info.si_signo, &info);
+ }
+#endif
+ break;
+#endif
+ case EXCP_INTERRUPT:
+ /* just indicate that signals should be handled asap */
+ break;
+ case EXCP_DEBUG:
+ {
+ int sig;
+
+ sig = gdb_handlesig (env, TARGET_SIGTRAP);
+#if 0
+ if (sig)
+ {
+ info.si_signo = sig;
+ info.si_errno = 0;
+ info.si_code = TARGET_TRAP_BRKPT;
+ //queue_signal(env, info.si_signo, &info);
+ }
+#endif
+ }
+ break;
+ default:
+ printf ("Unhandled trap: 0x%x\n", trapnr);
+ cpu_dump_state(env, stderr, fprintf, 0);
+ exit (1);
+ }
+ process_pending_signals (env);
+ }
+}
+
+#endif
+
+static void usage(void)
+{
+ printf("qemu-" TARGET_ARCH " version " QEMU_VERSION ", Copyright (c) 2003-2008 Fabrice Bellard\n"
+ "usage: qemu-" TARGET_ARCH " [options] program [arguments...]\n"
+ "BSD CPU emulator (compiled for %s emulation)\n"
+ "\n"
+ "Standard options:\n"
+ "-h print this help\n"
+ "-g port wait gdb connection to port\n"
+ "-L path set the elf interpreter prefix (default=%s)\n"
+ "-s size set the stack size in bytes (default=%ld)\n"
+ "-cpu model select CPU (-cpu ? for list)\n"
+ "-drop-ld-preload drop LD_PRELOAD for target process\n"
+ "-bsd type select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
+ "\n"
+ "Debug options:\n"
+ "-d options activate log (logfile=%s)\n"
+ "-p pagesize set the host page size to 'pagesize'\n"
+ "-strace log system calls\n"
+ "\n"
+ "Environment variables:\n"
+ "QEMU_STRACE Print system calls and arguments similar to the\n"
+ " 'strace' program. Enable by setting to any value.\n"
+ ,
+ TARGET_ARCH,
+ interp_prefix,
+ x86_stack_size,
+ DEBUG_LOGFILE);
+ _exit(1);
+}
+
+THREAD CPUState *thread_env;
+
+/* Assumes contents are already zeroed. */
+void init_task_state(TaskState *ts)
+{
+ int i;
+
+ ts->used = 1;
+ ts->first_free = ts->sigqueue_table;
+ for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
+ ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
+ }
+ ts->sigqueue_table[i].next = NULL;
+}
+
+int main(int argc, char **argv)
+{
+ const char *filename;
+ const char *cpu_model;
+ struct target_pt_regs regs1, *regs = ®s1;
+ struct image_info info1, *info = &info1;
+ TaskState ts1, *ts = &ts1;
+ CPUState *env;
+ int optind;
+ const char *r;
+ int gdbstub_port = 0;
+ int drop_ld_preload = 0, environ_count = 0;
+ char **target_environ, **wrk, **dst;
+ enum BSDType bsd_type = target_openbsd;
+
+ if (argc <= 1)
+ usage();
+
+ /* init debug */
+ cpu_set_log_filename(DEBUG_LOGFILE);
+
+ cpu_model = NULL;
+ optind = 1;
+ for(;;) {
+ if (optind >= argc)
+ break;
+ r = argv[optind];
+ if (r[0] != '-')
+ break;
+ optind++;
+ r++;
+ if (!strcmp(r, "-")) {
+ break;
+ } else if (!strcmp(r, "d")) {
+ int mask;
+ const CPULogItem *item;
+
+ if (optind >= argc)
+ break;
+
+ r = argv[optind++];
+ mask = cpu_str_to_log_mask(r);
+ if (!mask) {
+ printf("Log items (comma separated):\n");
+ for(item = cpu_log_items; item->mask != 0; item++) {
+ printf("%-10s %s\n", item->name, item->help);
+ }
+ exit(1);
+ }
+ cpu_set_log(mask);
+ } else if (!strcmp(r, "s")) {
+ r = argv[optind++];
+ x86_stack_size = strtol(r, (char **)&r, 0);
+ if (x86_stack_size <= 0)
+ usage();
+ if (*r == 'M')
+ x86_stack_size *= 1024 * 1024;
+ else if (*r == 'k' || *r == 'K')
+ x86_stack_size *= 1024;
+ } else if (!strcmp(r, "L")) {
+ interp_prefix = argv[optind++];
+ } else if (!strcmp(r, "p")) {
+ qemu_host_page_size = atoi(argv[optind++]);
+ if (qemu_host_page_size == 0 ||
+ (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
+ fprintf(stderr, "page size must be a power of two\n");
+ exit(1);
+ }
+ } else if (!strcmp(r, "g")) {
+ gdbstub_port = atoi(argv[optind++]);
+ } else if (!strcmp(r, "r")) {
+ qemu_uname_release = argv[optind++];
+ } else if (!strcmp(r, "cpu")) {
+ cpu_model = argv[optind++];
+ if (strcmp(cpu_model, "?") == 0) {
+/* XXX: implement xxx_cpu_list for targets that still miss it */
+#if defined(cpu_list)
+ cpu_list(stdout, &fprintf);
+#endif
+ _exit(1);
+ }
+ } else if (!strcmp(r, "drop-ld-preload")) {
+ drop_ld_preload = 1;
+ } else if (!strcmp(r, "bsd")) {
+ if (!strcasecmp(argv[optind], "freebsd")) {
+ bsd_type = target_freebsd;
+ } else if (!strcasecmp(argv[optind], "netbsd")) {
+ bsd_type = target_netbsd;
+ } else if (!strcasecmp(argv[optind], "openbsd")) {
+ bsd_type = target_openbsd;
+ } else {
+ usage();
+ }
+ optind++;
+ } else if (!strcmp(r, "strace")) {
+ do_strace = 1;
+ } else
+ {
+ usage();
+ }
+ }
+ if (optind >= argc)
+ usage();
+ filename = argv[optind];
+
+ /* Zero out regs */
+ memset(regs, 0, sizeof(struct target_pt_regs));
+
+ /* Zero out image_info */
+ memset(info, 0, sizeof(struct image_info));
+
+ /* Scan interp_prefix dir for replacement files. */
+ init_paths(interp_prefix);
+
+ if (cpu_model == NULL) {
+#if defined(TARGET_SPARC)
+#ifdef TARGET_SPARC64
+ cpu_model = "TI UltraSparc II";
+#else
+ cpu_model = "Fujitsu MB86904";
+#endif
+#else
+ cpu_model = "any";
+#endif
+ }
+ cpu_exec_init_all(0);
+ /* NOTE: we need to init the CPU at this stage to get
+ qemu_host_page_size */
+ env = cpu_init(cpu_model);
+ if (!env) {
+ fprintf(stderr, "Unable to find CPU definition\n");
+ exit(1);
+ }
+ thread_env = env;
+
+ if (getenv("QEMU_STRACE")) {
+ do_strace = 1;
+ }
+
+ wrk = environ;
+ while (*(wrk++))
+ environ_count++;
+
+ target_environ = malloc((environ_count + 1) * sizeof(char *));
+ if (!target_environ)
+ abort();
+ for (wrk = environ, dst = target_environ; *wrk; wrk++) {
+ if (drop_ld_preload && !strncmp(*wrk, "LD_PRELOAD=", 11))
+ continue;
+ *(dst++) = strdup(*wrk);
+ }
+ *dst = NULL; /* NULL terminate target_environ */
+
+ if (loader_exec(filename, argv+optind, target_environ, regs, info) != 0) {
+ printf("Error loading %s\n", filename);
+ _exit(1);
+ }
+
+ for (wrk = target_environ; *wrk; wrk++) {
+ free(*wrk);
+ }
+
+ free(target_environ);
+
+ if (loglevel) {
+ page_dump(logfile);
+
+ fprintf(logfile, "start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
+ fprintf(logfile, "end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code);
+ fprintf(logfile, "start_code 0x" TARGET_ABI_FMT_lx "\n",
+ info->start_code);
+ fprintf(logfile, "start_data 0x" TARGET_ABI_FMT_lx "\n",
+ info->start_data);
+ fprintf(logfile, "end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data);
+ fprintf(logfile, "start_stack 0x" TARGET_ABI_FMT_lx "\n",
+ info->start_stack);
+ fprintf(logfile, "brk 0x" TARGET_ABI_FMT_lx "\n", info->brk);
+ fprintf(logfile, "entry 0x" TARGET_ABI_FMT_lx "\n", info->entry);
+ }
+
+ target_set_brk(info->brk);
+ syscall_init();
+ signal_init();
+
+ /* build Task State */
+ memset(ts, 0, sizeof(TaskState));
+ init_task_state(ts);
+ ts->info = info;
+ env->opaque = ts;
+ env->user_mode_only = 1;
+
+#if defined(TARGET_SPARC)
+ {
+ int i;
+ env->pc = regs->pc;
+ env->npc = regs->npc;
+ env->y = regs->y;
+ for(i = 0; i < 8; i++)
+ env->gregs[i] = regs->u_regs[i];
+ for(i = 0; i < 8; i++)
+ env->regwptr[i] = regs->u_regs[i + 8];
+ }
+#else
+#error unsupported target CPU
+#endif
+
+ if (gdbstub_port) {
+ gdbserver_start (gdbstub_port);
+ gdb_handlesig(env, 0);
+ }
+ cpu_loop(env, bsd_type);
+ /* never exits */
+ return 0;
+}
