diff --git a/.gitignore b/.gitignore
index 8043b6b6..68fa3dd3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@
 config.mak
 lib/musl-gcc.specs
 /obj/
+.idea/*
diff --git a/arch/wasm32/atomic_arch.h b/arch/wasm32/atomic_arch.h
index 78b183cb..0f3c5478 100644
--- a/arch/wasm32/atomic_arch.h
+++ b/arch/wasm32/atomic_arch.h
@@ -4,7 +4,7 @@
 
 #include <stdlib.h>
 
-#define a_barrier() syscall(__NR_membarrier)
+#define a_barrier() (0)
 
 #define a_cas a_cas
 static inline int a_cas(volatile int *p, int t, int s)
diff --git a/arch/wasm32/pthread_arch.h b/arch/wasm32/pthread_arch.h
index 212f4e12..6c5a7161 100644
--- a/arch/wasm32/pthread_arch.h
+++ b/arch/wasm32/pthread_arch.h
@@ -7,3 +7,13 @@ static inline struct pthread *__pthread_self(void) {
 #define CANCEL_REG_IP 16
 
 #define MC_PC gregs[REG_EIP]
+
+#define __wait __wait
+static inline void __wait(volatile int *addr, volatile int *waiters, int cnt, int priv) {}
+static inline void __wake(volatile void *addr, int cnt, int priv) {}
+static inline void __futexwait(volatile void *addr, int val, int priv) {}
+
+#define __block_all_sigs __block_all_sigs
+static inline void __block_all_sigs(void *set) {}
+static inline void __block_app_sigs(void *set) {}
+static inline void __restore_sigs(void *set) {}
diff --git a/src/internal/malloc_impl.h b/src/internal/malloc_impl.h
index 5d025b06..8039ee82 100644
--- a/src/internal/malloc_impl.h
+++ b/src/internal/malloc_impl.h
@@ -34,7 +34,13 @@ struct bin {
 
 #define C_INUSE  ((size_t)1)
 
+#ifndef __wasm__
 #define IS_MMAPPED(c) !((c)->csize & (C_INUSE))
+#else
+#undef MMAP_THRESHOLD
+#define MMAP_THRESHOLD ((size_t)-1)
+#define IS_MMAPPED(c) (0)
+#endif
 
 __attribute__((__visibility__("hidden")))
 void __bin_chunk(struct chunk *);
diff --git a/src/internal/pthread_impl.h b/src/internal/pthread_impl.h
index c2deffb9..cece1953 100644
--- a/src/internal/pthread_impl.h
+++ b/src/internal/pthread_impl.h
@@ -150,6 +150,8 @@ void __vm_unlock(void);
 
 int __timedwait(volatile int *, int, clockid_t, const struct timespec *, int);
 int __timedwait_cp(volatile int *, int, clockid_t, const struct timespec *, int);
+
+#ifndef __wait
 void __wait(volatile int *, volatile int *, int, int);
 static inline void __wake(volatile void *addr, int cnt, int priv)
 {
@@ -164,14 +166,17 @@ static inline void __futexwait(volatile void *addr, int val, int priv)
 	__syscall(SYS_futex, addr, FUTEX_WAIT|priv, val) != -ENOSYS ||
 	__syscall(SYS_futex, addr, FUTEX_WAIT, val);
 }
+#endif
 
 void __acquire_ptc(void);
 void __release_ptc(void);
 void __inhibit_ptc(void);
 
+#ifndef __block_all_sigs
 void __block_all_sigs(void *);
 void __block_app_sigs(void *);
 void __restore_sigs(void *);
+#endif
 
 #define DEFAULT_STACK_SIZE 81920
 #define DEFAULT_GUARD_SIZE 4096
diff --git a/src/malloc/malloc.c b/src/malloc/malloc.c
index d72883e1..74a23afb 100644
--- a/src/malloc/malloc.c
+++ b/src/malloc/malloc.c
@@ -99,6 +99,7 @@ static int bin_index_up(size_t x)
 	if (x <= 32) return x;
 	x--;
 	if (x < 512) return bin_tab[x/8-4] + 1;
+	if (x > 0x1c00) return 64;
 	return bin_tab[x/128-4] + 17;
 }
 
@@ -283,6 +284,34 @@ static void trim(struct chunk *self, size_t n)
 	__bin_chunk(split);
 }
 
+// returns chunk which size is more then given n from the 63-th unsorted bin
+// if there is no suitable chunk returns 0
+static struct chunk *get_chunk_from_unsorted_bin(size_t n)
+{
+	const int unsorted_bin_id = 63;
+	struct chunk *current = 0;
+
+	lock_bin(unsorted_bin_id);
+	current = mal.bins[unsorted_bin_id].head;
+
+	while(current != 0 && current != mal.bins[unsorted_bin_id].tail) {
+		// use the simple first-fit strategy
+		if(current->csize >= n) {
+			if (!pretrim(current, n, unsorted_bin_id, unsorted_bin_id)) {
+				unbin(current, unsorted_bin_id);
+			}
+
+			unlock_bin(unsorted_bin_id);
+			return current;
+		}
+
+		current = current->next;
+	}
+
+	unlock_bin(unsorted_bin_id);
+	return 0;
+}
+
 void *malloc(size_t n)
 {
 	struct chunk *c;
@@ -293,7 +322,7 @@ void *malloc(size_t n)
 	if (n > MMAP_THRESHOLD) {
 		size_t len = n + OVERHEAD + PAGE_SIZE - 1 & -PAGE_SIZE;
 		char *base = __mmap(0, len, PROT_READ|PROT_WRITE,
-			MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+				MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
 		if (base == (void *)-1) return 0;
 		c = (void *)(base + SIZE_ALIGN - OVERHEAD);
 		c->csize = len - (SIZE_ALIGN - OVERHEAD);
@@ -304,17 +333,25 @@ void *malloc(size_t n)
 	i = bin_index_up(n);
 	for (;;) {
 		uint64_t mask = mal.binmap & -(1ULL<<i);
-		if (!mask) {
+		if (i == 64) {
+			c = get_chunk_from_unsorted_bin(n);
+			if(c != 0) {
+				break;
+			}
+		}
+
+		if (i == 64 || !mask) {
 			c = expand_heap(n);
 			if (!c) return 0;
 			if (alloc_rev(c)) {
 				struct chunk *x = c;
 				c = PREV_CHUNK(c);
 				NEXT_CHUNK(x)->psize = c->csize =
-					x->csize + CHUNK_SIZE(c);
+						x->csize + CHUNK_SIZE(c);
 			}
 			break;
 		}
+
 		j = first_set(mask);
 		lock_bin(j);
 		c = mal.bins[j].head;
diff --git a/src/malloc/wasm32/expand_heap.c b/src/malloc/wasm32/expand_heap.c
new file mode 100644
index 00000000..8c22c63d
--- /dev/null
+++ b/src/malloc/wasm32/expand_heap.c
@@ -0,0 +1,28 @@
+#include <limits.h>
+#include <stdint.h>
+#include <errno.h>
+#include <sys/mman.h>
+#include "libc.h"
+#include "syscall.h"
+
+#define WASM_PAGE_SIZE 65536
+
+/* Expand the heap in-place use WebAssembly grow_memory operators.
+ * The caller is responsible for locking to prevent concurrent calls. */
+
+void *__expand_heap(size_t *pn)
+{
+	size_t n = *pn;
+	n += -n & WASM_PAGE_SIZE-1;
+	unsigned delta = n / WASM_PAGE_SIZE;
+
+	unsigned res = __builtin_wasm_memory_grow(0, delta);
+	if (res == (unsigned)-1) {
+		errno = ENOMEM;
+		return 0;
+	}
+
+	void *area = (void*)(WASM_PAGE_SIZE * res);
+	*pn = n;
+	return area;
+}
diff --git a/src/mman/wasm32/madvise.c b/src/mman/wasm32/madvise.c
new file mode 100644
index 00000000..8d8869d9
--- /dev/null
+++ b/src/mman/wasm32/madvise.c
@@ -0,0 +1,6 @@
+#include <sys/mman.h>
+#include "libc.h"
+
+int __madvise(void *addr, size_t len, int advice) { return 0; }
+
+weak_alias(__madvise, madvise);
diff --git a/src/signal/wasm32/block.c b/src/signal/wasm32/block.c
new file mode 100644
index 00000000..620c5fa1
--- /dev/null
+++ b/src/signal/wasm32/block.c
@@ -0,0 +1 @@
+#include "pthread_impl.h"
diff --git a/src/signal/wasm32/raise.c b/src/signal/wasm32/raise.c
new file mode 100644
index 00000000..81e69cf8
--- /dev/null
+++ b/src/signal/wasm32/raise.c
@@ -0,0 +1,3 @@
+#include <signal.h>
+
+int raise(int sig) { }
diff --git a/src/stdio/vfwscanf.c b/src/stdio/vfwscanf.c
index a7cd0923..af66379a 100644
--- a/src/stdio/vfwscanf.c
+++ b/src/stdio/vfwscanf.c
@@ -215,7 +215,8 @@ int vfwscanf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap)
 			if (t == 'c') {
 				if (width<1) width = 1;
 				invert = 1;
-				set = L"";
+				static const wchar_t empty[] = { 0 };
+				set = empty;
 			} else if (t == 's') {
 				invert = 1;
 				static const wchar_t spaces[] = {
diff --git a/src/stdlib/wcstod.c b/src/stdlib/wcstod.c
index 26fe9af8..bd1ef040 100644
--- a/src/stdlib/wcstod.c
+++ b/src/stdlib/wcstod.c
@@ -12,8 +12,9 @@ static size_t do_read(FILE *f, unsigned char *buf, size_t len)
 {
 	size_t i;
 	const wchar_t *wcs = f->cookie;
+	static const wchar_t strudel[] = { '@', 0 };
 
-	if (!wcs[0]) wcs=L"@";
+	if (!wcs[0]) wcs=strudel;
 	for (i=0; i<f->buf_size && wcs[i]; i++)
 		f->buf[i] = wcs[i] < 128 ? wcs[i] : '@';
 	f->rpos = f->buf;
diff --git a/src/stdlib/wcstol.c b/src/stdlib/wcstol.c
index 4443f577..4744910e 100644
--- a/src/stdlib/wcstol.c
+++ b/src/stdlib/wcstol.c
@@ -14,8 +14,9 @@ static size_t do_read(FILE *f, unsigned char *buf, size_t len)
 {
 	size_t i;
 	const wchar_t *wcs = f->cookie;
+	static const wchar_t strudel[] = { '@', 0 };
 
-	if (!wcs[0]) wcs=L"@";
+	if (!wcs[0]) wcs=strudel;
 	for (i=0; i<f->buf_size && wcs[i]; i++)
 		f->buf[i] = wcs[i] < 128 ? wcs[i] : '@';
 	f->rpos = f->buf;
diff --git a/src/thread/wasm32/__wait.c b/src/thread/wasm32/__wait.c
new file mode 100644
index 00000000..d7ebd15a
--- /dev/null
+++ b/src/thread/wasm32/__wait.c
@@ -0,0 +1,2 @@
+#include "pthread_impl.h"
+