diff --git a/kernel/trunk/runtests.py b/kernel/trunk/runtests.py
index b69da7bfd1..7a64421a42 100755
--- a/kernel/trunk/runtests.py
+++ b/kernel/trunk/runtests.py
@@ -171,10 +171,10 @@ def run_tests_serially(tests, root_dir):
     return thread
 
 def gcc(fin, fout):
-    flags = "-m32 -std=c11 -g -O0 -masm=intel -fno-pie -w"
+    flags = "-m32 -std=c11 -g -O0 -fno-pie -w" # -masm-intel
     defines = "-D_FILE_OFFSET_BITS=64 -DNDEBUG -D_POSIX_C_SOURCE=200809L"
     include = "-Iumka -Iumka/linux"
-    command = f"gcc {flags} {defines} {include} -c {fin} -o {fout}"
+    command = f"clang {flags} {defines} {include} -c {fin} -o {fout}"
     print(command)
     os.system(command)
 
@@ -195,8 +195,6 @@ def build_umka():
     os.makedirs("umka/build/linux", exist_ok = True)
     sources = [ "umka_shell.c", 
                 "shell.c",
-                "trace.c",
-                "trace_lbr.c",
                 "vdisk.c",
                 "lodepng.c",
                 "linux/pci.c",
diff --git a/kernel/trunk/umka/umka.asm b/kernel/trunk/umka/umka.asm
index 147090b85a..76c054daac 100644
--- a/kernel/trunk/umka/umka.asm
+++ b/kernel/trunk/umka/umka.asm
@@ -11,6 +11,7 @@ UMKA_OS    = 3
 
 UMKA_MEMORY_BYTES = 256 SHL 20
 
+public umka_sys_put_image_palette
 public disk_add
 public disk_del
 public disk_list
@@ -570,6 +571,26 @@ proc umka_sti
         ret
 endp
 
+proc umka_sys_put_image_palette c, image, xsize, ysize, x, y, bpp, palette, row_offset
+        pushad
+        push    ebp
+        mov     eax, 65
+        mov     ebx, [image]
+        mov     ecx, [xsize]
+        shl     ecx, 16
+        or      ecx, [ysize]
+        mov     edx, [x]
+        shl     edx, 16
+        or      edx, [y]
+        mov     esi, [bpp]
+        mov     edi, [palette]
+        mov     ebp, [row_offset]
+        call    i40
+        pop     ebp
+        popad
+        ret
+endp
+
 extrn reset_procmask
 extrn get_fake_if
 public irq0
diff --git a/kernel/trunk/umka/umka.h b/kernel/trunk/umka/umka.h
index 742291cb8b..81eb76b66b 100644
--- a/kernel/trunk/umka/umka.h
+++ b/kernel/trunk/umka/umka.h
@@ -448,13 +448,13 @@ static inline size_t
 umka_new_sys_threads(uint32_t flags, void (*entry)(), void *stack) {
     size_t tid;
     __asm__ __inline__ __volatile__ (
-        "push ebx;"
-        "push esi;"
-        "push edi;"
+        "push %%ebx;"
+        "push %%esi;"
+        "push %%edi;"
         "call   kos_new_sys_threads;"
-        "pop edi;"
-        "pop esi;"
-        "pop ebx"
+        "pop %%edi;"
+        "pop %%esi;"
+        "pop %%ebx"
         : "=a"(tid)
         : "b"(flags),
           "c"(entry),
@@ -876,8 +876,8 @@ umka_find_next_task(int32_t priority) {
     find_next_task_t fnt;
     __asm__ __inline__ __volatile__ (
         "call   find_next_task;"
-        "setz   al;"
-        "movzx  eax, al"
+        "setz   %%al;"
+        "movzx  %%eax, %%al"
         : "=b"(fnt.appdata),
           "=D"(fnt.taskdata),
           "=a"(fnt.same)
@@ -889,10 +889,10 @@ umka_find_next_task(int32_t priority) {
 static inline void
 umka_i40(pushad_t *regs) {
     __asm__ __inline__ __volatile__ (
-        "push   ebp;"
-        "mov    ebp, %[ebp];"
+        "push   %%ebp;"
+        "mov    %%ebp, %[ebp];"
         "call   i40;"
-        "pop    ebp"
+        "pop    %%ebp"
         : "=a"(regs->eax),
           "=b"(regs->ebx)
         : "a"(regs->eax),
@@ -1322,25 +1322,10 @@ umka_sys_set_font_size(uint32_t size) {
         : "memory");
 }
 
-static inline void
+void
 umka_sys_put_image_palette(void *image, size_t xsize, size_t ysize,
                            size_t x, size_t y, size_t bpp, void *palette,
-                           size_t row_offset) {
-    __asm__ __inline__ __volatile__ (
-        "push   ebp;"
-        "mov    ebp, %[row_offset];"
-        "call   i40;"
-        "pop    ebp"
-        :
-        : "a"(65),
-          "b"(image),
-          "c"((xsize << 16) + ysize),
-          "d"((x << 16) + y),
-          "S"(bpp),
-          "D"(palette),
-          [row_offset] "Rm"(row_offset)
-        : "memory");
-}
+                           size_t row_offset);
 
 static inline void
 umka_sys_move_window(size_t x, size_t y, ssize_t xsize, ssize_t ysize) {