From 3b6a5af52cff72d77600b848d6d851f71b162bc2 Mon Sep 17 00:00:00 2001
From: matthewc <unknown>
Date: Fri, 22 Nov 2002 07:43:30 +0000
Subject: [PATCH] [project @ 2002-11-22 07:43:29 by matthewc] Implement
 adjustor thunks for IA64. N.B. malloc'd memory isn't
 executable, so I'm currently allocating them on the
 (mmap'd) Haskell heap instead...

---
 ghc/rts/Adjustor.c |  121 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 ghc/rts/MBlock.c   |    4 +-
 2 files changed, 123 insertions(+), 2 deletions(-)

diff --git a/ghc/rts/Adjustor.c b/ghc/rts/Adjustor.c
index 2ea1240..ed3cb50 100644
--- a/ghc/rts/Adjustor.c
+++ b/ghc/rts/Adjustor.c
@@ -76,6 +76,37 @@ static unsigned char __obscure_ccall_ret_code [] =
 #include <machine/pal.h>
 #endif
 
+#if defined(ia64_TARGET_ARCH)
+#include "Storage.h"
+
+/* Layout of a function descriptor */
+typedef struct _IA64FunDesc {
+    StgWord64 ip;
+    StgWord64 gp;
+} IA64FunDesc;
+
+static void *
+stgAllocStable(size_t size_in_bytes, StgStablePtr *stable)
+{
+  StgArrWords* arr;
+  nat data_size_in_words, total_size_in_words;
+  
+  /* round up to a whole number of words */
+  data_size_in_words  = (size_in_bytes + sizeof(W_) + 1) / sizeof(W_);
+  total_size_in_words = sizeofW(StgArrWords) + data_size_in_words;
+  
+  /* allocate and fill it in */
+  arr = (StgArrWords *)allocate(total_size_in_words);
+  SET_ARR_HDR(arr, &stg_ARR_WORDS_info, CCCS, data_size_in_words);
+ 
+  /* obtain a stable ptr */
+  *stable = getStablePtr((StgPtr)arr);
+
+  /* and return a ptr to the goods inside the array */
+  return(BYTE_ARR_CTS(arr));
+}
+#endif
+
 void*
 createAdjustor(int cconv, StgStablePtr hptr, StgFunPtr wptr)
 {
@@ -341,6 +372,85 @@ TODO: Depending on how much allocation overhead stgMallocBytes uses for
 			__asm__ volatile ("sync\n\tisync");
 		}
 	}
+#elif defined(ia64_TARGET_ARCH)
+/*
+    Up to 8 inputs are passed in registers.  We flush the last two inputs to
+    the stack, initially into the 16-byte scratch region left by the caller.
+    We then shuffle the others along by 4 (taking 2 registers for ourselves
+    to save return address and previous function state - we need to come back
+    here on the way out to restore the stack, so this is a real function
+    rather than just a trampoline).
+    
+    The function descriptor we create contains the gp of the target function
+    so gp is already loaded correctly.
+
+	[MLX]       alloc r16=ar.pfs,10,2,0
+		    movl r17=wptr
+	[MII]       st8.spill [r12]=r38,8		// spill in6 (out4)
+		    mov r41=r37				// out7 = in5 (out3)
+		    mov r40=r36;;			// out6 = in4 (out2)
+	[MII]       st8.spill [r12]=r39			// spill in7 (out5)
+		    mov.sptk b6=r17,50
+		    mov r38=r34;;			// out4 = in2 (out0)
+	[MII]       mov r39=r35				// out5 = in3 (out1)
+		    mov r37=r33				// out3 = in1 (loc1)
+		    mov r36=r32				// out2 = in0 (loc0)
+	[MLX]       adds r12=-24,r12			// update sp
+		    movl r34=hptr;;			// out0 = hptr
+	[MIB]       mov r33=r16				// loc1 = ar.pfs
+		    mov r32=b0				// loc0 = retaddr
+		    br.call.sptk.many b0=b6;;
+
+	[MII]       adds r12=-16,r12
+		    mov b0=r32
+		    mov.i ar.pfs=r33
+	[MFB]       nop.m 0x0
+		    nop.f 0x0
+		    br.ret.sptk.many b0;;
+*/
+
+/* These macros distribute a long constant into the two words of an MLX bundle */
+#define BITS(val,start,count)	(((val) >> (start)) & ((1 << (count))-1))
+#define MOVL_LOWORD(val)	(BITS(val,22,18) << 46)
+#define MOVL_HIWORD(val)	(BITS(val,40,23) | (BITS(val,0,7) << 36) | (BITS(val,7,9) << 50) \
+				| (BITS(val,16,5) << 55) | (BITS(val,21,1) << 44) | BITS(val,63,1) << 59)
+
+    {
+	StgStablePtr stable;
+	IA64FunDesc *wdesc = (IA64FunDesc *)wptr;
+	StgWord64 wcode = wdesc->ip;
+	IA64FunDesc *fdesc;
+	StgWord64 *code;
+
+	/* we allocate on the Haskell heap since malloc'd memory isn't executable - argh */
+	adjustor = stgAllocStable(sizeof(IA64FunDesc)+18*8, &stable);
+
+	fdesc = (IA64FunDesc *)adjustor;
+	code = (StgWord64 *)(fdesc + 1);
+	fdesc->ip = (StgWord64)code;
+	fdesc->gp = wdesc->gp;
+
+	code[0]  = 0x0000058004288004 | MOVL_LOWORD(wcode);
+	code[1]  = 0x6000000220000000 | MOVL_HIWORD(wcode);
+	code[2]  = 0x029015d818984001;
+	code[3]  = 0x8401200500420094;
+	code[4]  = 0x886011d8189c0001;
+	code[5]  = 0x84011004c00380c0;
+	code[6]  = 0x0250210046013800;
+	code[7]  = 0x8401000480420084;
+	code[8]  = 0x0000233f19a06005 | MOVL_LOWORD((StgWord64)hptr);
+	code[9]  = 0x6000000440000000 | MOVL_HIWORD((StgWord64)hptr);
+	code[10] = 0x0200210020010811;
+	code[11] = 0x1080006800006200;
+	code[12] = 0x0000210018406000;
+	code[13] = 0x00aa021000038005;
+	code[14] = 0x000000010000001d;
+	code[15] = 0x0084000880000200;
+
+	/* save stable pointers in convenient form */
+	code[16] = (StgWord64)hptr;
+	code[17] = (StgWord64)stable;
+    }
 #else
     barf("adjustor creation not supported on this platform");
 #endif
@@ -394,6 +504,17 @@ freeHaskellFunctionPtr(void* ptr)
    return;
  }
  freeStablePtr(*((StgStablePtr*)((unsigned char*)ptr + 4*12)));
+#elif defined(ia64_TARGET_ARCH)
+ IA64FunDesc *fdesc = (IA64FunDesc *)ptr;
+ StgWord64 *code = (StgWord64 *)(fdesc+1);
+
+ if (fdesc->ip != (StgWord64)code) {
+   fprintf(stderr, "freeHaskellFunctionPtr: not for me, guv! %p\n", ptr);
+   return;
+ }
+ freeStablePtr((StgStablePtr)code[16]);
+ freeStablePtr((StgStablePtr)code[17]);
+ return;
 #else
  ASSERT(0);
 #endif
diff --git a/ghc/rts/MBlock.c b/ghc/rts/MBlock.c
index 590c556..c87dd6a 100644
--- a/ghc/rts/MBlock.c
+++ b/ghc/rts/MBlock.c
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: MBlock.c,v 1.39 2002/11/22 06:54:05 matthewc Exp $
+ * $Id: MBlock.c,v 1.40 2002/11/22 07:43:30 matthewc Exp $
  *
  * (c) The GHC Team 1998-1999
  *
@@ -121,7 +121,7 @@ my_mmap (void *addr, int size)
     else
 	vm_protect(mach_task_self(),ret,size,FALSE,VM_PROT_READ|VM_PROT_WRITE);
 #else
-    ret = mmap(addr, size, PROT_READ | PROT_WRITE, 
+    ret = mmap(addr, size, PROT_READ | PROT_WRITE | PROT_EXEC, 
 	       MAP_ANON | MAP_PRIVATE, -1, 0);
 #endif
 
-- 
1.7.10.4