diff --git a/src/comp/middle/trans.rs b/src/comp/middle/trans.rs
index db27a823fbc315477e2c9ec8613edfe909228efb..c7ad35b52fd6e24bcba7e59cd71bf6503296135b 100644
--- a/src/comp/middle/trans.rs
+++ b/src/comp/middle/trans.rs
@@ -428,8 +428,7 @@ fn T_crate(type_names tn) -> TypeRef {
                           T_int(),      // int n_rust_syms
                           T_int(),      // int n_c_syms
                           T_int(),      // int n_libs
-                          T_int(),      // uintptr_t abi_tag
-                          T_int()       // void* crate_map
+                          T_int()       // uintptr_t abi_tag
                           ));
     tn.associate(s, t);
     ret t;
@@ -6624,8 +6623,7 @@ fn create_typedefs(@crate_ctxt cx) {
     llvm.LLVMAddTypeName(cx.llmod, _str.buf("tydesc"), T_tydesc(cx.tn));
 }
 
-fn create_crate_constant(ValueRef crate_ptr, @glue_fns glues,
-                         ValueRef crate_map) {
+fn create_crate_constant(ValueRef crate_ptr, @glue_fns glues) {
 
     let ValueRef crate_addr = p2i(crate_ptr);
 
@@ -6653,8 +6651,7 @@ fn create_crate_constant(ValueRef crate_ptr, @glue_fns glues,
                      C_null(T_int()),     // int n_rust_syms
                      C_null(T_int()),     // int n_c_syms
                      C_null(T_int()),     // int n_libs
-                     C_int(abi.abi_x86_rustc_fastcall), // uintptr_t abi_tag
-                     p2i(crate_map)       // void* crate_map
+                     C_int(abi.abi_x86_rustc_fastcall) // uintptr_t abi_tag
                      ));
 
     llvm.LLVMSetInitializer(crate_ptr, crate_val);
@@ -6684,9 +6681,9 @@ fn find_main_fn(@crate_ctxt cx) -> ValueRef {
     fail;
 }
 
-fn trans_main_fn(@local_ctxt cx, ValueRef llcrate) {
+fn trans_main_fn(@local_ctxt cx, ValueRef llcrate, ValueRef crate_map) {
     auto T_main_args = vec(T_int(), T_int());
-    auto T_rust_start_args = vec(T_int(), T_int(), T_int(), T_int());
+    auto T_rust_start_args = vec(T_int(), T_int(), T_int(), T_int(), T_int());
 
     auto main_name;
     if (_str.eq(std.os.target_os(), "win32")) {
@@ -6717,7 +6714,8 @@ fn trans_main_fn(@local_ctxt cx, ValueRef llcrate) {
         llvm.LLVMAppendBasicBlock(llmain, _str.buf(""));
     auto b = new_builder(llbb);
 
-    auto start_args = vec(p2i(llrust_main), p2i(llcrate), llargc, llargv);
+    auto start_args = vec(p2i(llrust_main), p2i(llcrate), llargc, llargv,
+                          p2i(crate_map));
 
     b.Ret(b.Call(llrust_start, start_args));
 }
@@ -7200,12 +7198,15 @@ fn make_common_glue(str output, bool optimize,
     llvm.LLVMSetTarget(llmod, _str.buf(x86.get_target_triple()));
     auto td = mk_target_data(x86.get_data_layout());
     auto tn = mk_type_names();
+    let ValueRef crate_ptr =
+        llvm.LLVMAddGlobal(llmod, T_crate(tn), _str.buf("rust_crate"));
 
     auto intrinsics = declare_intrinsics(llmod);
 
     llvm.LLVMSetModuleInlineAsm(llmod, _str.buf(x86.get_module_asm()));
 
     auto glues = make_glues(llmod, tn);
+    create_crate_constant(crate_ptr, glues);
     make_memcpy_glue(glues.memcpy_glue);
     make_bzero_glue(glues.bzero_glue);
 
@@ -7326,8 +7327,7 @@ fn trans_crate(session.session sess, @ast.crate crate,
     trans_vec_append_glue(cx);
     auto crate_map = create_crate_map(ccx);
     if (!shared) {
-        trans_main_fn(cx, crate_ptr);
-        create_crate_constant(crate_ptr, ccx.glues, crate_map);
+        trans_main_fn(cx, crate_ptr, crate_map);
     }
 
     // Translate the metadata.
diff --git a/src/rt/rust.cpp b/src/rt/rust.cpp
index 013705f26c268d9fa4345360f6e71d1ab185d7cf..6a42173636ebe2569ea47a92efa5264c237f3f70 100644
--- a/src/rt/rust.cpp
+++ b/src/rt/rust.cpp
@@ -78,9 +78,11 @@ command_line_args : public dom_owned<command_line_args>
 
 extern "C" CDECL int
 rust_start(uintptr_t main_fn, rust_crate const *crate, int argc,
-           char **argv) {
+           char **argv, void* crate_map) {
 
-    crate->update_log_settings(getenv("RUST_LOG"));
+    // Only when we're on rustc is the last argument passed
+    if (!crate->get_image_base())
+        update_log_settings(crate_map, getenv("RUST_LOG"));
     rust_srv *srv = new rust_srv();
     rust_kernel *kernel = new rust_kernel(srv);
     kernel->start();
diff --git a/src/rt/rust_crate.cpp b/src/rt/rust_crate.cpp
index e7ee0350468b343b7032323acdf7354f47d377cd..23f01c0747fa7cf9288e702640dae77e8313fb4b 100644
--- a/src/rt/rust_crate.cpp
+++ b/src/rt/rust_crate.cpp
@@ -65,92 +65,6 @@ rust_crate::get_debug_abbrev(rust_dom *dom) const {
         return mem_area(dom, 0, 0);
 }
 
-struct mod_entry {
-    const char* name;
-    int* state;
-};
-
-struct cratemap {
-    mod_entry* entries;
-    cratemap* children[1];
-};
-
-struct log_directive {
-    char* name;
-    size_t level;
-};
-
-const size_t max_log_directives = 255;
-
-size_t parse_logging_spec(char* spec, log_directive* dirs) {
-    size_t dir = 0;
-    while (dir < max_log_directives && *spec) {
-        char* start = spec;
-        char cur;
-        while (true) {
-            cur = *spec;
-            if (cur == ',' || cur == '=' || cur == '\0') {
-                if (start == spec) {spec++; break;}
-                *spec = '\0';
-                spec++;
-                size_t level = 3;
-                if (cur == '=') {
-                    level = *spec - '0';
-                    if (level > 3) level = 1;
-                    if (*spec) ++spec;
-                }
-                dirs[dir].name = start;
-                dirs[dir++].level = level;
-                break;
-            }
-            spec++;
-        }
-    }
-    return dir;
-}
-
-void update_crate_map(cratemap* map, log_directive* dirs, size_t n_dirs) {
-    // First update log levels for this crate
-    for (mod_entry* cur = map->entries; cur->name; cur++) {
-        size_t level = 1, longest_match = 0;
-        for (size_t d = 0; d < n_dirs; d++) {
-            if (strstr(cur->name, dirs[d].name) == cur->name &&
-                strlen(dirs[d].name) > longest_match) {
-                longest_match = strlen(dirs[d].name);
-                level = dirs[d].level;
-            }
-        }
-        *cur->state = level;
-    }
-
-    // Then recurse on linked crates
-    for (size_t i = 0; map->children[i]; i++) {
-        update_crate_map(map->children[i], dirs, n_dirs);
-    }
-}
-
-void rust_crate::update_log_settings(char* settings) const {
-    // Only try this if the crate was generated by Rustc, not rustboot
-    if (image_base_off) return;
-
-    // This is a rather ugly parser for strings in the form
-    // "crate1,crate2.mod3,crate3.x=2". Log levels range 0=err, 1=warn,
-    // 2=info, 3=debug. Default is 1. Words without an '=X' part set the log
-    // level for that module (and submodules) to 3.
-    char* buffer = NULL;
-    log_directive dirs[256];
-    size_t dir = 0;
-    if (settings) {
-        buffer = (char*)malloc(strlen(settings));
-        strcpy(buffer, settings);
-        dir = parse_logging_spec(buffer, &dirs[0]);
-    }
-
-    update_crate_map((cratemap*)crate_map, &dirs[0], dir);
-
-    free(buffer);
-}
-
 //
 // Local Variables:
 // mode: C++
diff --git a/src/rt/rust_internal.h b/src/rt/rust_internal.h
index 695fc21d98e76e7ea8e75fb149cc7d4084449623..4a1f3e458b351f9e8b63e915eefd9b43782af81e 100644
--- a/src/rt/rust_internal.h
+++ b/src/rt/rust_internal.h
@@ -248,9 +248,6 @@ public:
     size_t n_libs;
 
     uintptr_t abi_tag;
-    // FIXME: not generated by rustboot, should only be accessed in crates
-    // generated by rustc.
-    void* crate_map;
 
     // Crates are immutable, constructed by the compiler.
 
@@ -262,8 +259,6 @@ public:
     uintptr_t get_gc_glue() const;
     uintptr_t get_exit_task_glue() const;
 
-    void update_log_settings(char* settings) const;
-
     struct mem_area
     {
       rust_dom *dom;
diff --git a/src/rt/rust_log.cpp b/src/rt/rust_log.cpp
index 076c4b0ae7a0edba2ebc783d3c9fea0ae3a70431..8f074cdf3cb3578b312b2b674cc77546ca91cfa5 100644
--- a/src/rt/rust_log.cpp
+++ b/src/rt/rust_log.cpp
@@ -218,3 +218,86 @@ void
 rust_log::reset_indent(uint32_t indent) {
     _indent = indent;
 }
+
+struct mod_entry {
+    const char* name;
+    int* state;
+};
+
+struct cratemap {
+    mod_entry* entries;
+    cratemap* children[1];
+};
+
+struct log_directive {
+    char* name;
+    size_t level;
+};
+
+const size_t max_log_directives = 255;
+
+// This is a rather ugly parser for strings in the form
+// "crate1,crate2.mod3,crate3.x=2". Log levels range 0=err, 1=warn, 2=info,
+// 3=debug. Default is 1. Words without an '=X' part set the log level for
+// that module (and submodules) to 3.
+size_t parse_logging_spec(char* spec, log_directive* dirs) {
+    size_t dir = 0;
+    while (dir < max_log_directives && *spec) {
+        char* start = spec;
+        char cur;
+        while (true) {
+            cur = *spec;
+            if (cur == ',' || cur == '=' || cur == '\0') {
+                if (start == spec) {spec++; break;}
+                *spec = '\0';
+                spec++;
+                size_t level = 3;
+                if (cur == '=') {
+                    level = *spec - '0';
+                    if (level > 3) level = 1;
+                    if (*spec) ++spec;
+                }
+                dirs[dir].name = start;
+                dirs[dir++].level = level;
+                break;
+            }
+            spec++;
+        }
+    }
+    return dir;
+}
+
+void update_crate_map(cratemap* map, log_directive* dirs, size_t n_dirs) {
+    // First update log levels for this crate
+    for (mod_entry* cur = map->entries; cur->name; cur++) {
+        size_t level = 1, longest_match = 0;
+        for (size_t d = 0; d < n_dirs; d++) {
+            if (strstr(cur->name, dirs[d].name) == cur->name &&
+                strlen(dirs[d].name) > longest_match) {
+                longest_match = strlen(dirs[d].name);
+                level = dirs[d].level;
+            }
+        }
+        *cur->state = level;
+    }
+
+    // Then recurse on linked crates
+    for (size_t i = 0; map->children[i]; i++) {
+        update_crate_map(map->children[i], dirs, n_dirs);
+    }
+}
+
+void update_log_settings(void* crate_map, char* settings) {
+    char* buffer = NULL;
+    log_directive dirs[256];
+    size_t dir = 0;
+    if (settings) {
+        buffer = (char*)malloc(strlen(settings));
+        strcpy(buffer, settings);
+        dir = parse_logging_spec(buffer, &dirs[0]);
+    }
+
+    update_crate_map((cratemap*)crate_map, &dirs[0], dir);
+
+    free(buffer);
+}
diff --git a/src/rt/rust_log.h b/src/rt/rust_log.h
index 3b40869b71c721697202e48b410fcca7f2d9d172..150d239a74d1317c87451ac4f30170910b9de368 100644
--- a/src/rt/rust_log.h
+++ b/src/rt/rust_log.h
@@ -93,4 +93,6 @@ rust_log::is_tracing(uint32_t type_bits) {
     return type_bits & _type_bit_mask;
 }
 
+void update_log_settings(void* crate_map, char* settings);
+
 #endif /* RUST_LOG_H */