diff --git a/lib/emscripten/src/bitwise.rs b/lib/emscripten/src/bitwise.rs
index aa7fbab3238..6868c402a55 100644
--- a/lib/emscripten/src/bitwise.rs
+++ b/lib/emscripten/src/bitwise.rs
@@ -1,8 +1,9 @@
+use crate::emscripten_target;
 use wasmer_runtime_core::vm::Ctx;
 
 ///emscripten: _llvm_bswap_i64
 pub fn _llvm_bswap_i64(_ctx: &mut Ctx, _low: i32, high: i32) -> i32 {
     debug!("emscripten::_llvm_bswap_i64");
-    // setTempRet0(low.swap_bytes)
+    emscripten_target::setTempRet0(_ctx, _low.swap_bytes());
     high.swap_bytes()
 }
diff --git a/lib/emscripten/src/emscripten_target.rs b/lib/emscripten/src/emscripten_target.rs
index 1877cbff1e5..1c575123b3d 100644
--- a/lib/emscripten/src/emscripten_target.rs
+++ b/lib/emscripten/src/emscripten_target.rs
@@ -5,8 +5,8 @@ use crate::env::get_emscripten_data;
 use libc::getdtablesize;
 use wasmer_runtime_core::vm::Ctx;
 
-pub fn setTempRet0(_ctx: &mut Ctx, _a: i32) {
-    debug!("emscripten::setTempRet0");
+pub fn setTempRet0(_ctx: &mut Ctx, _val: i32) {
+    debug!("emscripten::setTempRet0: {}", _val);
 }
 pub fn getTempRet0(_ctx: &mut Ctx) -> i32 {
     debug!("emscripten::getTempRet0");
diff --git a/lib/emscripten/src/io/mod.rs b/lib/emscripten/src/io/mod.rs
index ceee3bdc18d..6666cd5afbb 100644
--- a/lib/emscripten/src/io/mod.rs
+++ b/lib/emscripten/src/io/mod.rs
@@ -25,21 +25,35 @@ pub fn getprotobynumber(_ctx: &mut Ctx, _one: i32) -> i32 {
 }
 
 /// sigdelset
-pub fn sigdelset(_ctx: &mut Ctx, _one: i32, _two: i32) -> i32 {
+pub fn sigdelset(ctx: &mut Ctx, set: i32, signum: i32) -> i32 {
     debug!("emscripten::sigdelset");
-    unimplemented!()
+    let memory = ctx.memory(0);
+    #[allow(clippy::cast_ptr_alignment)]
+    let ptr = emscripten_memory_pointer!(memory, set) as *mut i32;
+
+    unsafe { *ptr = *ptr & !(1 << (signum - 1)) }
+
+    0
 }
 
 /// sigfillset
-pub fn sigfillset(_ctx: &mut Ctx, _one: i32) -> i32 {
+pub fn sigfillset(ctx: &mut Ctx, set: i32) -> i32 {
     debug!("emscripten::sigfillset");
-    unimplemented!()
+    let memory = ctx.memory(0);
+    #[allow(clippy::cast_ptr_alignment)]
+    let ptr = emscripten_memory_pointer!(memory, set) as *mut i32;
+
+    unsafe {
+        *ptr = -1;
+    }
+
+    0
 }
 
 /// tzset
 pub fn tzset(_ctx: &mut Ctx) {
-    debug!("emscripten::tzset");
-    unimplemented!()
+    debug!("emscripten::tzset - stub");
+    //unimplemented!()
 }
 
 /// strptime
diff --git a/lib/emscripten/src/lib.rs b/lib/emscripten/src/lib.rs
index b544bdc115d..958202c7a90 100644
--- a/lib/emscripten/src/lib.rs
+++ b/lib/emscripten/src/lib.rs
@@ -512,8 +512,8 @@ pub fn generate_emscripten_env(globals: &mut EmscriptenGlobals) -> ImportObject
         "___syscall77" => func!(crate::syscalls::___syscall77),
         "___syscall83" => func!(crate::syscalls::___syscall83),
         "___syscall85" => func!(crate::syscalls::___syscall85),
-        "___syscall91" => func!(crate::syscalls::___syscall191),
-        "___syscall94" => func!(crate::syscalls::___syscall194),
+        "___syscall91" => func!(crate::syscalls::___syscall91),
+        "___syscall94" => func!(crate::syscalls::___syscall94),
         "___syscall97" => func!(crate::syscalls::___syscall97),
         "___syscall102" => func!(crate::syscalls::___syscall102),
         "___syscall110" => func!(crate::syscalls::___syscall110),
diff --git a/lib/emscripten/src/memory.rs b/lib/emscripten/src/memory.rs
index 02877a011d9..16aece81d27 100644
--- a/lib/emscripten/src/memory.rs
+++ b/lib/emscripten/src/memory.rs
@@ -20,7 +20,7 @@ pub fn _emscripten_memcpy_big(ctx: &mut Ctx, dest: u32, src: u32, len: u32) -> u
 pub fn _emscripten_get_heap_size(_ctx: &mut Ctx) -> u32 {
     debug!("emscripten::_emscripten_get_heap_size",);
     // TODO: Fix implementation
-    16_777_216
+    162_107_392
 }
 
 /// emscripten: _emscripten_resize_heap
@@ -35,7 +35,7 @@ pub fn get_total_memory(_ctx: &mut Ctx) -> u32 {
     debug!("emscripten::get_total_memory");
     // instance.memories[0].current_pages()
     // TODO: Fix implementation
-    16_777_216
+    _ctx.memory(0).size().bytes().0 as u32
 }
 
 /// emscripten: enlargeMemory