Preliminary BSD user emulator support

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

1 files changed, 273 insertions, 0 deletions

diff --git a/bsd-user/syscall.c b/bsd-user/syscall.c
new file mode 100644
index 0000000..45fb5e4
--- /dev/null
+++ b/bsd-user/syscall.c
@@ -0,0 +1,273 @@
+/*
+ *  BSD syscalls
+ *
+ *  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 <stdint.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <time.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/syscall.h>
+#include <signal.h>
+#include <utime.h>
+
+#include "qemu.h"
+#include "qemu-common.h"
+
+//#define DEBUG
+
+static abi_ulong target_brk;
+static abi_ulong target_original_brk;
+
+#define get_errno(x) (x)
+#define target_to_host_bitmask(x, tbl) (x)
+
+void target_set_brk(abi_ulong new_brk)
+{
+    target_original_brk = target_brk = HOST_PAGE_ALIGN(new_brk);
+}
+
+/* do_syscall() should always have a single exit point at the end so
+   that actions, such as logging of syscall results, can be performed.
+   All errnos that do_syscall() returns must be -TARGET_<errcode>. */
+abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
+                            abi_long arg2, abi_long arg3, abi_long arg4,
+                            abi_long arg5, abi_long arg6)
+{
+    abi_long ret;
+    void *p;
+
+#ifdef DEBUG
+    gemu_log("freebsd syscall %d\n", num);
+#endif
+    if(do_strace)
+        print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
+
+    switch(num) {
+    case TARGET_FREEBSD_NR_exit:
+#ifdef HAVE_GPROF
+        _mcleanup();
+#endif
+        gdb_exit(cpu_env, arg1);
+        /* XXX: should free thread stack and CPU env */
+        _exit(arg1);
+        ret = 0; /* avoid warning */
+        break;
+    case TARGET_FREEBSD_NR_read:
+        if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
+            goto efault;
+        ret = get_errno(read(arg1, p, arg3));
+        unlock_user(p, arg2, ret);
+        break;
+    case TARGET_FREEBSD_NR_write:
+        if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
+            goto efault;
+        ret = get_errno(write(arg1, p, arg3));
+        unlock_user(p, arg2, 0);
+        break;
+    case TARGET_FREEBSD_NR_open:
+        if (!(p = lock_user_string(arg1)))
+            goto efault;
+        ret = get_errno(open(path(p),
+                             target_to_host_bitmask(arg2, fcntl_flags_tbl),
+                             arg3));
+        unlock_user(p, arg1, 0);
+        break;
+    case TARGET_FREEBSD_NR_mmap:
+        ret = get_errno(target_mmap(arg1, arg2, arg3,
+                                    target_to_host_bitmask(arg4, mmap_flags_tbl),
+                                    arg5,
+                                    arg6));
+        break;
+    case TARGET_FREEBSD_NR_mprotect:
+        ret = get_errno(target_mprotect(arg1, arg2, arg3));
+        break;
+    case TARGET_FREEBSD_NR_syscall:
+    case TARGET_FREEBSD_NR___syscall:
+        ret = do_freebsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
+        break;
+    default:
+        ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
+        break;
+    }
+ fail:
+#ifdef DEBUG
+    gemu_log(" = %ld\n", ret);
+#endif
+    if (do_strace)
+        print_freebsd_syscall_ret(num, ret);
+    return ret;
+ efault:
+    ret = -TARGET_EFAULT;
+    goto fail;
+}
+
+abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
+                           abi_long arg2, abi_long arg3, abi_long arg4,
+                           abi_long arg5, abi_long arg6)
+{
+    abi_long ret;
+    void *p;
+
+#ifdef DEBUG
+    gemu_log("netbsd syscall %d\n", num);
+#endif
+    if(do_strace)
+        print_netbsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
+
+    switch(num) {
+    case TARGET_NETBSD_NR_exit:
+#ifdef HAVE_GPROF
+        _mcleanup();
+#endif
+        gdb_exit(cpu_env, arg1);
+        /* XXX: should free thread stack and CPU env */
+        _exit(arg1);
+        ret = 0; /* avoid warning */
+        break;
+    case TARGET_NETBSD_NR_read:
+        if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
+            goto efault;
+        ret = get_errno(read(arg1, p, arg3));
+        unlock_user(p, arg2, ret);
+        break;
+    case TARGET_NETBSD_NR_write:
+        if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
+            goto efault;
+        ret = get_errno(write(arg1, p, arg3));
+        unlock_user(p, arg2, 0);
+        break;
+    case TARGET_NETBSD_NR_open:
+        if (!(p = lock_user_string(arg1)))
+            goto efault;
+        ret = get_errno(open(path(p),
+                             target_to_host_bitmask(arg2, fcntl_flags_tbl),
+                             arg3));
+        unlock_user(p, arg1, 0);
+        break;
+    case TARGET_NETBSD_NR_mmap:
+        ret = get_errno(target_mmap(arg1, arg2, arg3,
+                                    target_to_host_bitmask(arg4, mmap_flags_tbl),
+                                    arg5,
+                                    arg6));
+        break;
+    case TARGET_NETBSD_NR_mprotect:
+        ret = get_errno(target_mprotect(arg1, arg2, arg3));
+        break;
+    case TARGET_NETBSD_NR_syscall:
+    case TARGET_NETBSD_NR___syscall:
+        ret = do_netbsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
+        break;
+    default:
+        ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
+        break;
+    }
+ fail:
+#ifdef DEBUG
+    gemu_log(" = %ld\n", ret);
+#endif
+    if (do_strace)
+        print_netbsd_syscall_ret(num, ret);
+    return ret;
+ efault:
+    ret = -TARGET_EFAULT;
+    goto fail;
+}
+
+abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
+                            abi_long arg2, abi_long arg3, abi_long arg4,
+                            abi_long arg5, abi_long arg6)
+{
+    abi_long ret;
+    void *p;
+
+#ifdef DEBUG
+    gemu_log("openbsd syscall %d\n", num);
+#endif
+    if(do_strace)
+        print_openbsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
+
+    switch(num) {
+    case TARGET_OPENBSD_NR_exit:
+#ifdef HAVE_GPROF
+        _mcleanup();
+#endif
+        gdb_exit(cpu_env, arg1);
+        /* XXX: should free thread stack and CPU env */
+        _exit(arg1);
+        ret = 0; /* avoid warning */
+        break;
+    case TARGET_OPENBSD_NR_read:
+        if (!(p = lock_user(VERIFY_WRITE, arg2, arg3, 0)))
+            goto efault;
+        ret = get_errno(read(arg1, p, arg3));
+        unlock_user(p, arg2, ret);
+        break;
+    case TARGET_OPENBSD_NR_write:
+        if (!(p = lock_user(VERIFY_READ, arg2, arg3, 1)))
+            goto efault;
+        ret = get_errno(write(arg1, p, arg3));
+        unlock_user(p, arg2, 0);
+        break;
+    case TARGET_OPENBSD_NR_open:
+        if (!(p = lock_user_string(arg1)))
+            goto efault;
+        ret = get_errno(open(path(p),
+                             target_to_host_bitmask(arg2, fcntl_flags_tbl),
+                             arg3));
+        unlock_user(p, arg1, 0);
+        break;
+    case TARGET_OPENBSD_NR_mmap:
+        ret = get_errno(target_mmap(arg1, arg2, arg3,
+                                    target_to_host_bitmask(arg4, mmap_flags_tbl),
+                                    arg5,
+                                    arg6));
+        break;
+    case TARGET_OPENBSD_NR_mprotect:
+        ret = get_errno(target_mprotect(arg1, arg2, arg3));
+        break;
+    case TARGET_OPENBSD_NR_syscall:
+    case TARGET_OPENBSD_NR___syscall:
+        ret = do_openbsd_syscall(cpu_env,arg1 & 0xffff,arg2,arg3,arg4,arg5,arg6,0);
+        break;
+    default:
+        ret = syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
+        break;
+    }
+ fail:
+#ifdef DEBUG
+    gemu_log(" = %ld\n", ret);
+#endif
+    if (do_strace)
+        print_openbsd_syscall_ret(num, ret);
+    return ret;
+ efault:
+    ret = -TARGET_EFAULT;
+    goto fail;
+}
+
+void syscall_init(void)
+{
+}