diff --git a/bsd-user/e2k/target_arch_thread.h b/bsd-user/e2k/target_arch_thread.h
index 869e1c9149..a9179e1405 100644
--- a/bsd-user/e2k/target_arch_thread.h
+++ b/bsd-user/e2k/target_arch_thread.h
@@ -35,10 +35,44 @@ static inline void target_thread_set_upcall(CPUE2KState *regs, abi_ulong entry,
     assert(0 && "target_thread_set_upcall is not implemented yet");
 }
 
+static abi_ulong e2k_mmap(abi_ulong size)
+{
+    abi_ulong addr;
+    abi_ulong guard = TARGET_PAGE_SIZE;
+
+    if (size < TARGET_PAGE_SIZE) {
+        size = TARGET_PAGE_SIZE;
+    }
+    if (guard < qemu_real_host_page_size) {
+        guard = qemu_real_host_page_size;
+    }
+
+    addr = target_mmap(0, size + guard, PROT_READ | PROT_WRITE,
+        MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+    if (addr == -1) {
+        perror("mmap e2k stack");
+        exit(-1);
+    }
+
+    target_mprotect(addr + size, guard, PROT_NONE);
+    return addr;
+}
+
+// compare to linux-user/elfload.c:init_thread for e2k
 static inline void target_thread_init(struct target_pt_regs *regs,
     struct image_info *infop)
 {
-    assert(0 && "target_thread_init is not implemented yet");
+    abi_ulong start_stack = infop->start_stack & ~0xf;
+
+    regs->ip = infop->entry;
+
+    // FIXME: set real start stack address
+    regs->sbr = infop->arg_strings & ~0xf;
+    regs->usd_lo = (0x1800UL << 48) | start_stack;
+    regs->usd_hi = (regs->sbr - start_stack) << 32;
+
+    e2k_psp_new(&regs->pcsp, E2K_DEFAULT_PCS_SIZE, false);
+    e2k_psp_new(&regs->psp, E2K_DEFAULT_PS_SIZE, true);
 }
 
 #endif /* !_TARGET_ARCH_THREAD_H_ */