Port qemu-wasm backend to Espressif QEMU 9.2

configure

@@ -341,7 +341,7 @@ EOF
 }
 
 if check_define __EMSCRIPTEN__ ; then
-  host_os=linux
+  host_os=emscripten
 elif check_define __linux__ ; then
   host_os=linux
 elif check_define _WIN32 ; then
@@ -553,7 +553,7 @@ else
     host_bits=32
 fi
 
-if test -n "$host_arch" && {
+if test -n "$host_arch" && test "$host_arch" != wasm32 && {
     ! test -d "$source_path/linux-user/include/host/$host_arch" ||
     ! test -d "$source_path/common-user/host/$host_arch"; }; then
     error_exit "linux-user/include/host/$host_arch does not exist." \

meson.build

@@ -45,7 +45,7 @@ genh = []
 qapi_trace_events = []
 
 bsd_oses = ['gnu/kfreebsd', 'freebsd', 'netbsd', 'openbsd', 'dragonfly', 'darwin']
-supported_oses = ['windows', 'freebsd', 'netbsd', 'openbsd', 'darwin', 'sunos', 'linux']
+supported_oses = ['windows', 'freebsd', 'netbsd', 'openbsd', 'darwin', 'sunos', 'linux', 'emscripten']
 supported_cpus = ['ppc', 'ppc64', 's390x', 'riscv32', 'riscv64', 'x86', 'x86_64',
   'arm', 'aarch64', 'loongarch64', 'mips', 'mips64', 'sparc64', 'wasm32']
 
@@ -309,6 +309,7 @@ endif
 # Compiler flags #
 ##################
 
+if host_arch != 'wasm32'
 foreach lang : all_languages
   compiler = meson.get_compiler(lang)
   if compiler.get_id() == 'gcc' and compiler.version().version_compare('>=7.4')
@@ -328,6 +329,7 @@ foreach lang : all_languages
     error('You either need GCC v7.4 or Clang v10.0 (or XCode Clang v15.0) to compile QEMU')
   endif
 endforeach
+endif
 
 # default flags for all hosts
 # We use -fwrapv to tell the compiler that we require a C dialect where
@@ -510,7 +512,7 @@ safe_stack_probe = '''
   #endif
       return 0;
   }'''
-if get_option('safe_stack') != not cc.compiles(safe_stack_probe)
+if host_arch != 'wasm32' and get_option('safe_stack') != not cc.compiles(safe_stack_probe)
   safe_stack_arg = get_option('safe_stack') ? '-fsanitize=safe-stack' : '-fno-sanitize=safe-stack'
   if get_option('safe_stack') != not cc.compiles(safe_stack_probe, args: safe_stack_arg)
     error(get_option('safe_stack') \
@@ -520,7 +522,7 @@ if get_option('safe_stack') != not cc.compiles(safe_stack_probe)
   qemu_cflags += safe_stack_arg
   qemu_ldflags += safe_stack_arg
 endif
-if get_option('safe_stack') and coroutine_backend != 'ucontext'
+if host_arch != 'wasm32' and get_option('safe_stack') and coroutine_backend != 'ucontext'
   error('SafeStack is only supported with the ucontext coroutine backend')
 endif
 
@@ -1018,7 +1020,7 @@ endif
 # problems on multi-arch where people try to build
 # 32-bit QEMU while pointing at 64-bit glib headers
 
-if not cc.compiles('''
+if host_arch != 'wasm32' and not cc.compiles('''
   #include <glib.h>
   #include <unistd.h>
 
@@ -1229,9 +1231,11 @@ if not get_option('slirp').auto() or have_system
     slirp_cflags += ['-DLIBSLIRP_STATIC'] 
   endif
 
-  slirp = declare_dependency(dependencies: [slirp_dep],
-                          compile_args: slirp_cflags,
-                          version: slirp_dep.version())
+  if slirp_dep.found()
+    slirp = declare_dependency(dependencies: [slirp_dep],
+                               compile_args: slirp_cflags,
+                               version: slirp_dep.version())
+  endif
 
   # slirp < 4.7 is incompatible with CFI support in QEMU.  This is because
   # it passes function pointers within libslirp as callbacks for timers.

tcg/wasm32/tcg-target.c.inc

@@ -3776,7 +3776,8 @@ void tcg_out_init() {
 }
 
 /* Test if a constant matches the constraint. */
-static bool tcg_target_const_match(int64_t val, TCGType type, int ct, int vece)
+static bool tcg_target_const_match(int64_t val, int ct, TCGType type,
+                                   TCGCond cond, int vece)
 {
     return ct & TCG_CT_CONST;
 }

tcg/wasm32/tcg-target.h

@@ -93,6 +93,8 @@
 #define TCG_TARGET_HAS_orc_i64          1
 #define TCG_TARGET_HAS_rot_i64          1
 #define TCG_TARGET_HAS_negsetcond_i64   0
+#define TCG_TARGET_HAS_tst              0
+#define TCG_TARGET_HAS_tst_vec          0
 #define TCG_TARGET_HAS_movcond_i64      1
 #define TCG_TARGET_HAS_muls2_i64        0
 #define TCG_TARGET_HAS_add2_i32         1