From: Tanaka Akira <akr@...17n.org>
Date: 2005-06-07T20:06:32+09:00
Subject: Re: Rails on Altix ia64

In article <t9GdnaIzKMnk3RTfRVn-uw@rcn.net>,
  "Adam P. Jenkins" <ajenkins@interactivesupercomputing.com> writes:

> Has anyone successfully run a Rails application on an Altix, or other
> ia64 machine?  I'm getting a segmentation fault in gc.c.  More info below.

I'd like to know following patch fix your problem or not.

Index: eval.c
===================================================================
RCS file: /src/ruby/eval.c,v
retrieving revision 1.616.2.98
diff -u -r1.616.2.98 eval.c
--- eval.c	25 May 2005 23:09:05 -0000	1.616.2.98
+++ eval.c	7 Jun 2005 11:02:32 -0000
@@ -111,7 +111,27 @@
     abort();			/* ensure noreturn */
 }
 #define longjmp(env, val) rb_jump_context(env, val)
-#define setjmp(j) ((j)->status = 0, getcontext(&(j)->context), (j)->status)
+#define callee_save_registers_may_be_breaked_here \
+  __asm__ volatile ("" : : :  \
+    "in0",  "in1",  "in2",  "in3",  "in4",  "in5",  "in6",  "in7", \
+    "loc0", "loc1", "loc2", "loc3", "loc4", "loc5", "loc6", "loc7", \
+    "loc8", "loc9", "loc10","loc11","loc12","loc13","loc14","loc15", \
+    "loc16","loc17","loc18","loc19","loc20","loc21","loc22","loc23", \
+    "loc24","loc25","loc26","loc27","loc28","loc29","loc30","loc31", \
+    "loc32","loc33","loc34","loc35","loc36","loc37","loc38","loc39", \
+    "loc40","loc41","loc42","loc43","loc44","loc45","loc46","loc47", \
+    "loc48","loc49","loc50","loc51","loc52","loc53","loc54","loc55", \
+    "loc56","loc57","loc58","loc59","loc60","loc61","loc62","loc63", \
+    "loc64","loc65","loc66","loc67","loc68","loc69","loc70","loc71", \
+    "loc72","loc73","loc74","loc75","loc76","loc77","loc78","loc79", \
+    "out0", "out1", "out2", "out3", "out4", "out5", "out6", "out7");
+#define setjmp(j) ({ \
+  ucontext_t *ucp; \
+  (j)->status = 0; \
+  ucp = &(j)->context; \
+  callee_save_registers_may_be_breaked_here; \
+  getcontext(ucp); \
+  (j)->status; })
 #else
 typedef jmp_buf rb_jmpbuf_t;
 #ifndef setjmp
@@ -9918,8 +9938,10 @@
     {
 	ucontext_t ctx;
 	VALUE *top, *bot;
+	ucontext_t *ctxp = &ctx;
 
-	getcontext(&ctx);
+	callee_save_registers_may_be_breaked_here;
+	getcontext(ctxp);
 	bot = (VALUE*)__libc_ia64_register_backing_store_base;
 #if defined(__FreeBSD__)
 	top = (VALUE*)ctx.uc_mcontext.mc_special.bspstore;


I know the patch is very ugly, gcc&IA64 depended, and it tickle
gcc-3.3.5 optimization bug.
-- 
Tanaka Akira