Revert "rt: Make stack growth code build on Linux"

This reverts commit da4b7da.

Author: brson

mk/rt.mk

@@ -67,7 +67,8 @@ RUNTIME_CS_$(1) := \
 
 RUNTIME_S_$(1) := rt/arch/$$(HOST_$(1))/_context.S \
                   rt/arch/$$(HOST_$(1))/ccall.S \
-                  rt/arch/$$(HOST_$(1))/morestack.S
+                  rt/arch/$$(HOST_$(1))/morestack.S \
+                  rt/arch/$$(HOST_$(1))/record_sp.S
 
 RUNTIME_HDR_$(1) := rt/globals.h \
                rt/rust.h \

src/rt/arch/i386/morestack.S

@@ -106,18 +106,13 @@ L$bail:
 
 #ifdef __APPLE__
 
-		.section	__IMPORT,__pointers,non_lazy_symbol_pointers
+	.section	__IMPORT,__pointers,non_lazy_symbol_pointers
 rust_new_stack_sym:
     .indirect_symbol RUST_NEW_STACK
     .long 0
 rust_del_stack_sym:
     .indirect_symbol RUST_DEL_STACK
     .long 0
 
-#else
-
-rust_new_stack_sym:
-rust_del_stack_sym:
-
 #endif
 

src/rt/rust_scheduler.cpp

@@ -13,6 +13,9 @@ DWORD rust_scheduler::task_key;
 
 bool rust_scheduler::tls_initialized = false;
 
+// Defined in arch/*/record_sp.S.
+extern "C" void rust_record_sp(uintptr_t sp);
+
 rust_scheduler::rust_scheduler(rust_kernel *kernel,
                                rust_srv *srv,
                                int id) :
@@ -286,6 +289,7 @@ rust_scheduler::start_main_loop() {
              scheduled_task->state->name);
 
         place_task_in_tls(scheduled_task);
+        rust_record_sp(scheduled_task->stk->limit);
         //pthread_setspecific(89, (void *)scheduled_task->stk->limit);
 
         interrupt_flag = 0;