Preliminary BSD user emulator support

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5544 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 576 insertions, 0 deletions

diff --git a/bsd-user/main.c b/bsd-user/main.c
new file mode 100644
index 0000000000..d2129cc0c1
--- /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 = &regs1;
+    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;
+}