rt: Make unwinding through __morestack work on mac

Had to bump the min stack size in some of the tests from 256 bytes
to 1024 bytes. Not sure why yet.

Author: brson

src/rt/arch/i386/morestack.S

@@ -47,17 +47,17 @@
 #endif
 
 MORESTACK:
-#ifdef __linux__
+#if defined(__linux__) || defined(__APPLE__)
 	.cfi_startproc
 #endif
 
 	pushl %ebp
-#ifdef __linux__
+#if defined(__linux__) || defined(__APPLE__)
 	.cfi_def_cfa_offset 8
 	.cfi_offset %ebp, -8
 #endif
 	movl %esp, %ebp
-#ifdef __linux__
+#if defined(__linux__) || defined(__APPLE__)
 	.cfi_def_cfa_register %ebp
 #endif
 
@@ -69,7 +69,7 @@ MORESTACK:
 	jz .L$bail
 
 	// During unwinding we want to skip our caller.
-#ifdef __linux__
+#if defined(__linux__) || defined(__APPLE__)
 	// Don't understand this line. I think it means that
 	// the next frame's pc is the return address of our caller.
 	.cfi_offset 8, 8
@@ -134,7 +134,7 @@ MORESTACK:
 	addl $16,%esp
 
 	popl %ebp
-#ifdef __linux__
+#if defined(__linux__) || defined(__APPLE__)
 	.cfi_restore %ebp
 	.cfi_def_cfa %esp, 4
 #endif
@@ -150,7 +150,7 @@ MORESTACK:
 
 	jmpl *%edx
 
-#ifdef __linux__
+#if defined(__linux__) || defined(__APPLE__)
 	.cfi_endproc
 #endif
 

src/rt/arch/x86_64/morestack.S

@@ -50,30 +50,22 @@
 
 #if defined(__linux__) || defined(__APPLE__)
 MORESTACK:
-#if defined(__ELF__)
 	.cfi_startproc
-#endif
 
 	// Set up a normal backtrace
 	pushq %rbp
-#if defined(__ELF__)
 	.cfi_def_cfa_offset 16
 	.cfi_offset %rbp, -16
-#endif
 	movq %rsp, %rbp
-#if defined(__ELF__)
 	.cfi_def_cfa_register %rbp
-#endif
 
 	// During unwinding we want to skip our caller since it's not
 	// a complete frame and will make the unwinder sad
-#if defined(__linux__)
 	// Don't understand this line
 	.cfi_offset 16, 0
 	// Tell the unwinding where to get the stack pointer for
 	// our grandparent frame
 	.cfi_offset %rsp, -24
-#endif
 
 	// Save the grandparent stack pointer for the unwinder
 	leaq 16(%rbp), %rax
@@ -147,15 +139,11 @@ MORESTACK:
 
 	addq $8, %rsp
 	popq %rbp
-#ifdef __linux__
 	.cfi_restore %rbp
 	.cfi_def_cfa %rsp, 8
-#endif
 	ret
 
-#if defined(__ELF__)
 	.cfi_endproc
-#endif
 
 #else
 MORESTACK:

src/test/run-fail/morestack2.rs

@@ -33,7 +33,7 @@ resource and_then_get_big_again(_i: ()) {
 }
 
 fn main() {
-    rustrt::set_min_stack(256u);
+    rustrt::set_min_stack(1024u);
     std::task::spawn((), fn (&&_i: ()) {
         let r = and_then_get_big_again(());
         getbig_call_c_and_fail(10000);

src/test/run-fail/morestack3.rs

@@ -29,6 +29,6 @@ resource and_then_get_big_again(_i: @int) {
 }
 
 fn main() {
-    rustrt::set_min_stack(256u);
-    std::task::spawn(100, getbig_and_fail);
+    rustrt::set_min_stack(1024u);
+    std::task::spawn(400, getbig_and_fail);
 }