qemu: add support for iOS host

This introduces support for building for iOS hosts. When the correct Xcode
toolchain is used, iOS host will be detected automatically.

block: disable features not supported by iOS sandbox
slirp: disable SMB features for iOS
target: disable system() calls for iOS
tcg: use sys_icache_invalidate() instead of GCC builtin for iOS
tests: disable tests on iOS which uses system()

block.c

@@ -53,7 +53,7 @@
 #ifdef CONFIG_BSD
 #include <sys/ioctl.h>
 #include <sys/queue.h>
-#ifndef __DragonFly__
+#if !defined(__DragonFly__) && !defined(CONFIG_IOS)
 #include <sys/disk.h>
 #endif
 #endif

block/file-posix.c

@@ -181,7 +181,16 @@ typedef struct BDRVRawReopenState {
     bool check_cache_dropped;
 } BDRVRawReopenState;
 
-static int fd_open(BlockDriverState *bs);
+static int fd_open(BlockDriverState *bs)
+{
+    BDRVRawState *s = bs->opaque;
+
+    /* this is just to ensure s->fd is sane (its called by io ops) */
+    if (s->fd >= 0)
+        return 0;
+    return -EIO;
+}
+
 static int64_t raw_getlength(BlockDriverState *bs);
 
 typedef struct RawPosixAIOData {
@@ -252,6 +261,12 @@ static int raw_normalize_devicepath(const char **filename, Error **errp)
 }
 #endif
 
+#if defined(CONFIG_IOS)
+static int probe_logical_blocksize(int fd, unsigned int *sector_size_p)
+{
+    return -ENOTSUP; /* not supported on iOS */
+}
+#else /* CONFIG_IOS */
 /*
  * Get logical block size via ioctl. On success store it in @sector_size_p.
  */
@@ -284,6 +299,7 @@ static int probe_logical_blocksize(int fd, unsigned int *sector_size_p)
 
     return success ? 0 : -errno;
 }
+#endif /* !CONFIG_IOS */
 
 /**
  * Get physical block size of @fd.
@@ -2306,7 +2322,7 @@ again:
         }
         if (size == 0)
 #endif
-#if defined(__APPLE__) && defined(__MACH__)
+#if !defined(CONFIG_IOS) && defined(__APPLE__) && defined(__MACH__)
         {
             uint64_t sectors = 0;
             uint32_t sector_size = 0;
@@ -3541,16 +3557,6 @@ hdev_co_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
 }
 #endif /* linux */
 
-static int fd_open(BlockDriverState *bs)
-{
-    BDRVRawState *s = bs->opaque;
-
-    /* this is just to ensure s->fd is sane (its called by io ops) */
-    if (s->fd >= 0)
-        return 0;
-    return -EIO;
-}
-
 static coroutine_fn int
 hdev_co_pdiscard(BlockDriverState *bs, int64_t offset, int bytes)
 {

configure

@@ -562,6 +562,19 @@ EOF
   compile_object
 }
 
+check_ios() {
+  cat > $TMPC <<EOF
+#ifdef __APPLE__
+#import "TargetConditionals.h"
+#if !TARGET_OS_IPHONE
+#error TARGET_OS_IPHONE not true
+#endif
+#endif
+int main(void) { return 0; }
+EOF
+  compile_object
+}
+
 check_include() {
 cat > $TMPC <<EOF
 #include <$1>
@@ -604,7 +617,11 @@ elif check_define __DragonFly__ ; then
 elif check_define __NetBSD__; then
   targetos='NetBSD'
 elif check_define __APPLE__; then
-  targetos='Darwin'
+  if check_ios ; then
+    targetos='iOS'
+  else
+    targetos='Darwin'
+  fi
 else
   # This is a fatal error, but don't report it yet, because we
   # might be going to just print the --help text, or it might
@@ -781,6 +798,22 @@ Darwin)
   # won't work when we're compiling with gcc as a C compiler.
   QEMU_CFLAGS="-DOS_OBJECT_USE_OBJC=0 $QEMU_CFLAGS"
 ;;
+iOS)
+  bsd="yes"
+  darwin="yes"
+  ios="yes"
+  if [ "$cpu" = "x86_64" ] ; then
+    QEMU_CFLAGS="-arch x86_64 $QEMU_CFLAGS"
+    QEMU_LDFLAGS="-arch x86_64 $QEMU_LDFLAGS"
+  fi
+  host_block_device_support="no"
+  audio_drv_list=""
+  audio_possible_drivers=""
+  QEMU_LDFLAGS="-framework CoreFoundation $QEMU_LDFLAGS"
+  # Disable attempts to use ObjectiveC features in os/object.h since they
+  # won't work when we're compiling with gcc as a C compiler.
+  QEMU_CFLAGS="-DOS_OBJECT_USE_OBJC=0 $QEMU_CFLAGS"
+;;
 SunOS)
   solaris="yes"
   make="${MAKE-gmake}"
@@ -6033,6 +6066,10 @@ if test "$darwin" = "yes" ; then
   echo "CONFIG_DARWIN=y" >> $config_host_mak
 fi
 
+if test "$ios" = "yes" ; then
+  echo "CONFIG_IOS=y" >> $config_host_mak
+fi
+
 if test "$solaris" = "yes" ; then
   echo "CONFIG_SOLARIS=y" >> $config_host_mak
 fi
@@ -7025,6 +7062,7 @@ echo "cpp_link_args = [${LDFLAGS:+$(meson_quote $LDFLAGS)}]" >> $cross
 echo "[binaries]" >> $cross
 echo "c = [$(meson_quote $cc)]" >> $cross
 test -n "$cxx" && echo "cpp = [$(meson_quote $cxx)]" >> $cross
+test -n "$objcc" && echo "objc = [$(meson_quote $objcc)]" >> $cross
 echo "ar = [$(meson_quote $ar)]" >> $cross
 echo "nm = [$(meson_quote $nm)]" >> $cross
 echo "pkgconfig = [$(meson_quote $pkg_config_exe)]" >> $cross
@@ -7043,6 +7081,9 @@ if test "$cross_compile" = "yes"; then
     if test "$linux" = "yes" ; then
         echo "system = 'linux'" >> $cross
     fi
+    if test "$darwin" = "yes" ; then
+        echo "system = 'darwin'" >> $cross
+    fi
     case "$ARCH" in
         i386|x86_64)
             echo "cpu_family = 'x86'" >> $cross

meson.build

@@ -142,7 +142,7 @@ if targetos == 'windows'
                                       include_directories: include_directories('.'))
 elif targetos == 'darwin'
   coref = dependency('appleframeworks', modules: 'CoreFoundation')
-  iokit = dependency('appleframeworks', modules: 'IOKit')
+  iokit = dependency('appleframeworks', modules: 'IOKit', required: 'CONFIG_IOS' not in config_host)
   cocoa = dependency('appleframeworks', modules: 'Cocoa', required: get_option('cocoa'))
 elif targetos == 'sunos'
   socket = [cc.find_library('socket'),

net/slirp.c

@@ -27,7 +27,7 @@
 #include "net/slirp.h"
 
 
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(CONFIG_IOS)
 #include <pwd.h>
 #include <sys/wait.h>
 #endif
@@ -90,7 +90,7 @@ typedef struct SlirpState {
     Slirp *slirp;
     Notifier poll_notifier;
     Notifier exit_notifier;
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(CONFIG_IOS)
     gchar *smb_dir;
 #endif
     GSList *fwd;
@@ -103,7 +103,7 @@ static QTAILQ_HEAD(, SlirpState) slirp_stacks =
 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp);
 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp);
 
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(CONFIG_IOS)
 static int slirp_smb(SlirpState *s, const char *exported_dir,
                      struct in_addr vserver_addr, Error **errp);
 static void slirp_smb_cleanup(SlirpState *s);
@@ -368,7 +368,7 @@ static int net_slirp_init(NetClientState *peer, const char *model,
     struct in6_addr ip6_prefix;
     struct in6_addr ip6_host;
     struct in6_addr ip6_dns;
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(CONFIG_IOS)
     struct in_addr smbsrv = { .s_addr = 0 };
 #endif
     NetClientState *nc;
@@ -478,7 +478,7 @@ static int net_slirp_init(NetClientState *peer, const char *model,
         return -1;
     }
 
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(CONFIG_IOS)
     if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
         error_setg(errp, "Failed to parse SMB address");
         return -1;
@@ -593,7 +593,7 @@ static int net_slirp_init(NetClientState *peer, const char *model,
             }
         }
     }
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(CONFIG_IOS)
     if (smb_export) {
         if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
             goto error;
@@ -785,7 +785,7 @@ void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
 
 }
 
-#ifndef _WIN32
+#if !defined(_WIN32) && !defined(CONFIG_IOS)
 
 /* automatic user mode samba server configuration */
 static void slirp_smb_cleanup(SlirpState *s)
@@ -900,7 +900,7 @@ static int slirp_smb(SlirpState* s, const char *exported_dir,
     return 0;
 }
 
-#endif /* !defined(_WIN32) */
+#endif /* !defined(_WIN32) && !defined(CONFIG_IOS) */
 
 static int guestfwd_can_read(void *opaque)
 {

qga/commands-posix.c

@@ -34,6 +34,12 @@
 
 #ifndef CONFIG_HAS_ENVIRON
 #ifdef __APPLE__
+#include "TargetConditionals.h"
+#if !TARGET_OS_IPHONE && !TARGET_IPHONE_SIMULATOR
+#define APPLE_USE_CRT_EXTERNS
+#endif
+#endif
+#ifdef APPLE_USE_CRT_EXTERNS
 #include <crt_externs.h>
 #define environ (*_NSGetEnviron())
 #else

target/arm/arm-semi.c

@@ -891,6 +891,7 @@ target_ulong do_arm_semihosting(CPUARMState *env)
         return clock() / (CLOCKS_PER_SEC / 100);
     case TARGET_SYS_TIME:
         return set_swi_errno(env, time(NULL));
+#if !defined(CONFIG_IOS) /* iOS does not have system() */
     case TARGET_SYS_SYSTEM:
         GET_ARG(0);
         GET_ARG(1);
@@ -907,6 +908,7 @@ target_ulong do_arm_semihosting(CPUARMState *env)
             unlock_user(s, arg0, 0);
             return ret;
         }
+#endif /* CONFIG_IOS */
     case TARGET_SYS_ERRNO:
         return get_swi_errno(env);
     case TARGET_SYS_GET_CMDLINE:

target/m68k/m68k-semi.c

@@ -402,6 +402,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
             result = isatty(arg0);
         }
         break;
+#if !defined(CONFIG_IOS) /* iOS does not have system() */
     case HOSTED_SYSTEM:
         GET_ARG(0);
         GET_ARG(1);
@@ -420,6 +421,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr)
             }
         }
         break;
+#endif /* CONFIG_IOS */
     case HOSTED_INIT_SIM:
 #if defined(CONFIG_USER_ONLY)
         {

target/nios2/nios2-semi.c

@@ -426,6 +426,7 @@ void do_nios2_semihosting(CPUNios2State *env)
             result = isatty(arg0);
         }
         break;
+#if !defined(CONFIG_IOS) /* iOS does not have system() */
     case HOSTED_SYSTEM:
         GET_ARG(0);
         GET_ARG(1);
@@ -444,6 +445,7 @@ void do_nios2_semihosting(CPUNios2State *env)
             }
         }
         break;
+#endif
     default:
         qemu_log_mask(LOG_GUEST_ERROR, "nios2-semihosting: unsupported "
                       "semihosting syscall %d\n", nr);

tcg/aarch64/tcg-target.h

@@ -148,9 +148,19 @@ typedef enum {
 #define TCG_TARGET_DEFAULT_MO (0)
 #define TCG_TARGET_HAS_MEMORY_BSWAP     1
 
+#if defined(__APPLE__)
+void sys_icache_invalidate(void *start, size_t len);
+#endif
+
 static inline void flush_icache_range(uintptr_t start, uintptr_t stop)
 {
+#if defined(__APPLE__)
+    sys_icache_invalidate((char *)start, stop - start);
+#elif defined(__GNUC__)
     __builtin___clear_cache((char *)start, (char *)stop);
+#else
+#error "Missing builtin to flush instruction cache"
+#endif
 }
 
 void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t);

tests/qtest/meson.build

@@ -46,12 +46,11 @@ qtests_i386 = \
   (config_all_devices.has_key('CONFIG_TPM_TIS_ISA') ? ['tpm-tis-test'] : []) +              \
   (config_all_devices.has_key('CONFIG_TPM_TIS_ISA') ? ['tpm-tis-swtpm-test'] : []) +        \
   (config_all_devices.has_key('CONFIG_RTL8139_PCI') ? ['rtl8139-test'] : []) +              \
+  (not config_host.has_key('CONFIG_IOS') ? ['bios-tables-test', 'hd-geo-test'] : []) +      \
   qtests_pci +                                                                              \
   ['fdc-test',
    'ide-test',
-   'hd-geo-test',
    'boot-order-test',
-   'bios-tables-test',
    'rtc-test',
    'i440fx-test',
    'fuzz-test',
@@ -142,9 +141,9 @@ qtests_arm = \
    'boot-serial-test',
    'hexloader-test']
 
-# TODO: once aarch64 TCG is fixed on ARM 32 bit host, make bios-tables-test unconditional
+# TODO: once aarch64 TCG is fixed on ARM 32 bit host, make bios-tables-test unconditional (except on iOS)
 qtests_aarch64 = \
-  (cpu != 'arm' ? ['bios-tables-test'] : []) +                                                  \
+  (cpu != 'arm' and not config_host.has_key('CONFIG_IOS') ? ['bios-tables-test'] : []) +        \
   (config_all_devices.has_key('CONFIG_TPM_TIS_SYSBUS') ? ['tpm-tis-device-test'] : []) +        \
   (config_all_devices.has_key('CONFIG_TPM_TIS_SYSBUS') ? ['tpm-tis-device-swtpm-test'] : []) +  \
   ['arm-cpu-features',