Move files and dirs from translate/

14 files changed, 2449 insertions, 0 deletions

diff --git a/src/grt/config/Makefile b/src/grt/config/Makefile
new file mode 100644
index 0000000..7d5f57d
--- /dev/null
+++ b/src/grt/config/Makefile
@@ -0,0 +1,14 @@
+CFLAGS=-Wall -g
+
+#ARCH_OBJS=i386.o linux.o
+ARCH_OBJS=ppc.o linux.o
+
+teststack: teststack.o $(ARCH_OBJS)
+	$(CC) -o $@ $< $(ARCH_OBJS)
+
+ppc.o: ppc.S
+	$(CC) -c -o $@ -g $<
+
+clean:
+	$(RM) -f *.o *~ teststack
+
diff --git a/src/grt/config/amd64.S b/src/grt/config/amd64.S
new file mode 100644
index 0000000..0a7f004
--- /dev/null
+++ b/src/grt/config/amd64.S
@@ -0,0 +1,131 @@
+/*  GRT stack implementation for amd64 (x86_64)
+    Copyright (C) 2005 - 2014 Tristan Gingold.
+
+    GHDL is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2, or (at your option) any later
+    version.
+
+    GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+
+    As a special exception, if other files instantiate generics from this
+    unit, or you link this unit with other files to produce an executable,
+    this unit does not by itself cause the resulting executable to be
+    covered by the GNU General Public License. This exception does not
+    however invalidate any other reasons why the executable file might be
+    covered by the GNU Public License.
+*/
+	.file		"amd64.S"
+
+#ifdef __ELF__
+#define ENTRY(func) .align 4; .globl func; .type func,@function; func:
+#define END(func) .size func, . - func
+#define NAME(name) name
+#elif __APPLE__
+#define ENTRY(func) .align 4; .globl _##func; _##func:
+#define END(func)
+#define NAME(name) _##name
+#else
+#define ENTRY(func) .align 4; func:
+#define END(func)
+#define NAME(name) name
+#endif
+	.text
+
+	/* Function called to loop on the process.  */
+ENTRY(grt_stack_loop)
+	mov	0(%rsp),%rdi
+	call	*8(%rsp)
+	jmp	NAME(grt_stack_loop)
+END(grt_stack_loop)
+
+	/* function Stack_Create (Func : Address; Arg : Address)
+ 	                          return Stack_Type;
+           Args: FUNC (RDI), ARG (RSI)
+	*/
+ENTRY(grt_stack_create)
+	/* Standard prologue.  */
+	pushq	%rbp
+	movq	%rsp,%rbp
+	/* Save args.  */
+	sub	$0x10,%rsp
+	mov	%rdi,-8(%rbp)
+	mov	%rsi,-16(%rbp)
+
+	/* Allocate the stack, and exit in case of failure  */
+	callq	NAME(grt_stack_allocate)
+	test	%rax,%rax
+	je	.Ldone
+
+	/* Note: %RAX contains the address of the stack_context.  This is
+	   also the top of the stack.  */
+
+	/* Prepare stack.  */
+	/* The function to be executed.  */
+	mov	-8(%rbp), %rdi
+	mov	%rdi, -8(%rax)
+	/* The argument.  */
+	mov	-16(%rbp), %rsi
+	mov	%rsi, -16(%rax)
+	/* The return function.  Must be 8 mod 16.  */
+#if __APPLE__
+	movq	_grt_stack_loop@GOTPCREL(%rip), %rsi
+	movq	%rsi, -24(%rax)
+#else
+	movq	$grt_stack_loop, -24(%rax)
+#endif
+	/* The context.  */
+	mov	%rbp, -32(%rax)
+	mov	%rbx, -40(%rax)
+	mov	%r12, -48(%rax)
+	mov	%r13, -56(%rax)
+	mov	%r14, -64(%rax)
+	mov	%r15, -72(%rax)
+
+	/* Save the new stack pointer to the stack context.  */
+	lea	-72(%rax), %rsi
+	mov	%rsi, (%rax)
+
+.Ldone:
+	leave
+	ret
+END(grt_stack_create)
+
+
+
+	/* Arguments:	TO (RDI), FROM (RSI) [VAL (RDX)]
+	   Both are pointers to a stack_context.  */
+ENTRY(grt_stack_switch)
+	/* Save call-used registers.  */
+	pushq	%rbp
+	pushq	%rbx
+	pushq	%r12
+	pushq	%r13
+	pushq	%r14
+	pushq	%r15
+	/* Save the current stack.  */
+	movq	%rsp, (%rsi)
+	/* Stack switch.  */
+	movq	(%rdi), %rsp
+	/* Restore call-used registers.  */
+	popq	%r15
+	popq	%r14
+	popq	%r13
+	popq	%r12
+	popq	%rbx
+	popq	%rbp
+	/* Return val.  */
+	movq	%rdx, %rax
+	/* Run.  */
+	ret
+END(grt_stack_switch)
+
+	.ident	"Written by T.Gingold"
diff --git a/src/grt/config/chkstk.S b/src/grt/config/chkstk.S
new file mode 100644
index 0000000..ab244d0
--- /dev/null
+++ b/src/grt/config/chkstk.S
@@ -0,0 +1,53 @@
+/*  GRT stack implementation for x86.
+    Copyright (C) 2002 - 2014 Tristan Gingold.
+
+    GHDL is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2, or (at your option) any later
+    version.
+
+    GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+
+    As a special exception, if other files instantiate generics from this
+    unit, or you link this unit with other files to produce an executable,
+    this unit does not by itself cause the resulting executable to be
+    covered by the GNU General Public License. This exception does not
+    however invalidate any other reasons why the executable file might be
+    covered by the GNU Public License.
+*/
+	.file		"chkstk.S"
+	.version	"01.01"
+	
+	.text
+
+#ifdef __APPLE__
+#define __chkstk ___chkstk
+#endif
+	
+	/* Function called to loop on the process.  */
+	.align 4
+#ifdef __ELF__
+	.type	__chkstk,@function
+#endif
+	.globl __chkstk
+__chkstk:
+	testl	%eax,%eax
+	je	0f
+	subl	$4,%eax		/* 4 bytes already used by call.  */
+	subl	%eax,%esp
+	jmp	*(%esp,%eax)
+0:
+	ret
+#ifdef __ELF__
+	.size	__chkstk, . - __chkstk
+#endif
+
+	.ident	"Written by T.Gingold"
diff --git a/src/grt/config/clock.c b/src/grt/config/clock.c
new file mode 100644
index 0000000..242af60
--- /dev/null
+++ b/src/grt/config/clock.c
@@ -0,0 +1,43 @@
+/*  GRT C bindings for time.
+    Copyright (C) 2002 - 2014 Tristan Gingold.
+
+    GHDL is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2, or (at your option) any later
+    version.
+
+    GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+
+    As a special exception, if other files instantiate generics from this
+    unit, or you link this unit with other files to produce an executable,
+    this unit does not by itself cause the resulting executable to be
+    covered by the GNU General Public License. This exception does not
+    however invalidate any other reasons why the executable file might be
+    covered by the GNU Public License.
+*/
+#include <time.h>
+
+int
+grt_get_clk_tck (void)
+{
+  return CLOCKS_PER_SEC;
+}
+
+void
+grt_get_times (int *wall, int *user, int *sys)
+{
+  clock_t res;
+
+  *wall = clock ();
+  *user = 0;
+  *sys = 0;
+}
+
diff --git a/src/grt/config/i386.S b/src/grt/config/i386.S
new file mode 100644
index 0000000..00d4719
--- /dev/null
+++ b/src/grt/config/i386.S
@@ -0,0 +1,141 @@
+/*  GRT stack implementation for x86.
+    Copyright (C) 2002 - 2014 Tristan Gingold.
+
+    GHDL is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2, or (at your option) any later
+    version.
+
+    GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+
+    As a special exception, if other files instantiate generics from this
+    unit, or you link this unit with other files to produce an executable,
+    this unit does not by itself cause the resulting executable to be
+    covered by the GNU General Public License. This exception does not
+    however invalidate any other reasons why the executable file might be
+    covered by the GNU Public License.
+*/
+	.file		"i386.S"
+	.version	"01.01"
+
+	.text
+
+#ifdef __ELF__
+#define ENTRY(func) .align 4; .globl func; .type func,@function; func:
+#define END(func) .size func, . - func
+#define NAME(name) name
+#elif __APPLE__
+#define ENTRY(func) .align 4; .globl _##func; _##func:
+#define END(func)
+#define NAME(name) _##name
+#else
+#define ENTRY(func) .align 4; func:
+#define END(func)
+#define NAME(name) name
+#endif
+
+	/* Function called to loop on the process.  */
+ENTRY(grt_stack_loop)
+	call	*4(%esp)
+	jmp	NAME(grt_stack_loop)
+END(grt_stack_loop)
+
+	/* function Stack_Create (Func : Address; Arg : Address)
+ 	                          return Stack_Type;
+	*/
+ENTRY(grt_stack_create)
+	/* Standard prologue.  */
+	pushl	%ebp
+	movl	%esp,%ebp
+	/* Keep aligned (call + pushl + 8 = 16 bytes).  */
+	subl	$8,%esp
+
+	/* Allocate the stack, and exit in case of failure  */
+	call	NAME(grt_stack_allocate)
+	testl	%eax,%eax
+	je	.Ldone
+
+	/* Note: %EAX contains the address of the stack_context.  This is
+	   also the top of the stack.  */
+
+	/* Prepare stack.  */
+	/* The function to be executed.  */
+	movl	8(%ebp), %ecx
+	movl	%ecx, -4(%eax)
+	/* The argument.  */
+	movl	12(%ebp), %ecx
+	movl	%ecx, -8(%eax)
+	/* The return function.  */
+#if __APPLE__
+	call	___x86.get_pc_thunk.cx
+L1$pb:
+	movl	L_grt_stack_loop$non_lazy_ptr-L1$pb(%ecx), %ecx
+	movl	%ecx,-12(%eax)
+#else
+	movl	$NAME(grt_stack_loop), -12(%eax)
+#endif
+	/* The context.  */
+	movl	%ebx, -16(%eax)
+	movl	%esi, -20(%eax)
+	movl	%edi, -24(%eax)
+	movl	%ebp, -28(%eax)
+
+	/* Save the new stack pointer to the stack context.  */
+	leal	-28(%eax), %ecx
+	movl	%ecx, (%eax)
+
+.Ldone:
+	leave
+	ret
+END(grt_stack_create)
+
+
+	/* Arguments:	TO, FROM
+	   Both are pointers to a stack_context.  */
+ENTRY(grt_stack_switch)
+	/* TO -> ECX.  */
+	movl	4(%esp), %ecx
+	/* FROM -> EDX.  */
+	movl	8(%esp), %edx
+	/* Save call-used registers.  */
+	pushl	%ebx
+	pushl	%esi
+	pushl	%edi
+	pushl	%ebp
+	/* Save the current stack.  */
+	movl	%esp, (%edx)
+	/* Stack switch.  */
+	movl	(%ecx), %esp
+	/* Restore call-used registers.  */
+	popl	%ebp
+	popl	%edi
+	popl	%esi
+	popl	%ebx
+	/* Run.  */
+	ret
+END(grt_stack_switch)
+
+
+#if __APPLE__
+	.section __TEXT,__textcoal_nt,coalesced,pure_instructions
+	.weak_definition ___x86.get_pc_thunk.cx
+	.private_extern	___x86.get_pc_thunk.cx
+___x86.get_pc_thunk.cx:
+	movl	(%esp), %ecx
+	ret
+
+	.section __IMPORT,__pointers,non_lazy_symbol_pointers
+L_grt_stack_loop$non_lazy_ptr:
+	.indirect_symbol _grt_stack_loop
+	.long	0
+#endif
+
+	.ident	"Written by T.Gingold"
diff --git a/src/grt/config/ia64.S b/src/grt/config/ia64.S
new file mode 100644
index 0000000..9ce3800
--- /dev/null
+++ b/src/grt/config/ia64.S
@@ -0,0 +1,331 @@
+/*  GRT stack implementation for ia64.
+    Copyright (C) 2002 - 2014 Tristan Gingold.
+
+    GHDL is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2, or (at your option) any later
+    version.
+
+    GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+
+    As a special exception, if other files instantiate generics from this
+    unit, or you link this unit with other files to produce an executable,
+    this unit does not by itself cause the resulting executable to be
+    covered by the GNU General Public License. This exception does not
+    however invalidate any other reasons why the executable file might be
+    covered by the GNU Public License.
+*/
+	.file	"ia64.S"
+	.pred.safe_across_calls p1-p5,p16-p63
+	
+	.text
+	.align 16
+	.proc grt_stack_loop
+grt_stack_loop:
+	alloc r32 = ar.pfs, 0, 1, 1, 0
+	.body
+	;;
+1:	mov r33 = r4	
+	br.call.sptk.many b0 = b1
+	;;
+	br 1b
+	.endp
+
+	frame_size = 480
+	
+	.global grt_stack_switch#
+	.proc grt_stack_switch#
+	/* r32:	struct stack_context *TO, r33:  struct stack_context *FROM.  */
+	//  Registers to be saved:
+	//  ar.rsc, ar.bsp, ar.pfs, ar.lc, ar.rnat [5]
+	//  gp, r4-r7 (+ Nat)                      [6]
+	//  f2-f5, f16-f31                         [20]
+	//  p1-p5, p16-p63                         [1] ???
+	//  b1-b5                                  [5]
+	//  f2-f5, f16-f31			   [20*16]
+grt_stack_switch:
+	.prologue 2, 2
+	.vframe r2
+	{
+	alloc r31=ar.pfs, 2, 0, 0, 0
+	mov r14 = ar.rsc
+	adds r12 = -frame_size, r12
+	.body
+	;;
+	}
+	// Save ar.rsc, ar.bsp, ar.pfs
+	{
+	st8 [r12] = r14      		// sp + 0  <- ar.rsc
+	mov r15 = ar.bsp
+	adds r22 = (5*8), r12
+	;;
+	}
+	{
+	st8.spill [r22] = r1, 8		// sp + 40 <- r1
+	;; 
+	st8.spill [r22] = r4, 8		// sp + 48 <- r4
+	adds r20 = 8, r12
+	;;
+	}
+	st8 [r20] = r15, 8		// sp + 8  <- ar.bsp
+	st8.spill [r22] = r5, 8		// sp + 56 <- r5
+	mov r15 = ar.lc
+	;;
+	{
+	st8 [r20] = r31, 8		// sp + 16 <- ar.pfs
+	//  Flush dirty registers to the backing store
+	flushrs
+	mov r14 = b0
+	;;
+	}
+	{
+	st8 [r20] = r15, 8		// sp + 24 <- ar.lc
+	//  Set the RSE in enforced lazy mode.
+	mov ar.rsc = 0
+	;;
+	}
+	{
+	//  Save sp.
+	st8 [r33] = r12
+	mov r15 = ar.rnat
+	mov r16 = b1
+	;;
+	}
+	{
+	st8.spill [r22] = r6, 8		// sp + 64 <- r6
+	st8 [r20] = r15, 64		// sp + 32 <- ar.rnat
+	;;
+	}
+	{
+	st8.spill [r22] = r7, 16	// sp + 72 <- r7
+	st8 [r20] = r14, 8		// sp + 96 <- b0
+	mov r15 = b2
+	;;
+	}
+	{
+	mov r17 = ar.unat
+	;;
+	st8 [r22] = r17, 24		// sp + 88 <- ar.unat
+	mov r14 = b3
+	;; 
+	}
+	{
+	st8 [r20] = r16, 16		// sp + 104 <- b1
+	st8 [r22] = r15, 16		// sp + 112 <- b2
+	mov r17 = b4
+	;;
+	}
+	{
+	st8 [r20] = r14, 16		// sp + 120 <- b3
+	st8 [r22] = r17, 16		// sp + 128 <- b4
+	mov r15 = b5
+	;; 
+	}
+	{
+	//  Read new sp.
+	ld8 r21 = [r32]
+	;; 
+	st8 [r20] = r15, 24		// sp + 136 <- b5
+	mov r14 = pr
+	;; 
+	}
+	;;
+	st8 [r22] = r14, 32		// sp + 144 <- pr
+	stf.spill [r20] = f2, 32	// sp + 160 <- f2
+	;;
+	stf.spill [r22] = f3, 32	// sp + 176 <- f3
+	stf.spill [r20] = f4, 32	// sp + 192 <- f4
+	;;
+	stf.spill [r22] = f5, 32	// sp + 208 <- f5
+	stf.spill [r20] = f16, 32	// sp + 224 <- f16
+	;;
+	stf.spill [r22] = f17, 32	// sp + 240 <- f17
+	stf.spill [r20] = f18, 32	// sp + 256 <- f18
+	;;
+	stf.spill [r22] = f19, 32	// sp + 272 <- f19
+	stf.spill [r20] = f20, 32	// sp + 288 <- f20
+	;;
+	stf.spill [r22] = f21, 32	// sp + 304 <- f21
+	stf.spill [r20] = f22, 32	// sp + 320 <- f22
+	;;
+	stf.spill [r22] = f23, 32	// sp + 336 <- f23
+	stf.spill [r20] = f24, 32	// sp + 352 <- f24
+	;;
+	stf.spill [r22] = f25, 32	// sp + 368 <- f25
+	stf.spill [r20] = f26, 32	// sp + 384 <- f26
+	;;
+	stf.spill [r22] = f27, 32	// sp + 400 <- f27
+	stf.spill [r20] = f28, 32	// sp + 416 <- f28
+	;;
+	stf.spill [r22] = f29, 32	// sp + 432 <- f29
+	stf.spill [r20] = f30, 32	// sp + 448 <- f30
+	;;
+	{
+	stf.spill [r22] = f31, 32	// sp + 464 <- f31
+	invala	
+	adds r20 = 8, r21
+	;;
+	}
+	ld8 r14 = [r21], 88		// sp + 0 (ar.rsc)
+	ld8 r16 = [r20], 8		// sp + 8 (ar.bsp)
+	;; 
+	ld8 r15 = [r21], -56		// sp + 88 (ar.unat)
+	;; 
+	ld8 r18 = [r20], 8		// sp + 16 (ar.pfs)
+	mov ar.unat = r15
+	ld8 r17 = [r21], 8		// sp + 32 (ar.rnat)
+	;;
+	ld8 r15 = [r20], 72		// sp + 24 (ar.lc)
+	ld8.fill r1 = [r21], 8		// sp + 40 (r1)
+	mov ar.bspstore = r16
+	;; 
+	ld8.fill r4 = [r21], 8		// sp + 48 (r4)
+	mov ar.pfs = r18
+	mov ar.rnat = r17
+	;;
+	mov ar.rsc = r14
+	mov ar.lc = r15
+	ld8 r17 = [r20], 8		// sp + 96 (b0)
+	;;
+	{
+	ld8.fill r5 = [r21], 8		// sp + 56 (r5)
+	ld8 r14 = [r20], 8		// sp + 104 (b1)
+	mov b0 = r17
+	;;
+	}
+	{
+	ld8.fill r6 = [r21], 8		// sp + 64 (r6)
+	ld8 r15 = [r20], 8		// sp + 112 (b2)
+	mov b1 = r14
+	;;
+	}
+	ld8.fill r7 = [r21], 64		// sp + 72 (r7)
+	ld8 r14 = [r20], 8		// sp + 120 (b3)
+	mov b2 = r15
+	;;
+	ld8 r15 = [r20], 16		// sp + 128 (b4)
+	ld8 r16 = [r21], 40		// sp + 136 (b5)
+	mov b3 = r14
+	;;
+	{
+	ld8 r14 = [r20], 16		// sp + 144 (pr)
+	;;
+	ldf.fill f2 = [r20], 32		// sp + 160 (f2)
+	mov b4 = r15
+	;;
+	}
+	ldf.fill f3 = [r21], 32		// sp + 176 (f3)
+	ldf.fill f4 = [r20], 32		// sp + 192 (f4)
+	mov b5 = r16
+	;;
+	ldf.fill f5 = [r21], 32		// sp + 208 (f5)
+	ldf.fill f16 = [r20], 32	// sp + 224 (f16)
+	mov pr = r14, -1
+	;;
+	ldf.fill f17 = [r21], 32	// sp + 240 (f17)
+	ldf.fill f18 = [r20], 32	// sp + 256 (f18)
+	;;
+	ldf.fill f19 = [r21], 32	// sp + 272 (f19)
+	ldf.fill f20 = [r20], 32	// sp + 288 (f20)
+	;;
+	ldf.fill f21 = [r21], 32	// sp + 304 (f21)
+	ldf.fill f22 = [r20], 32	// sp + 320 (f22)
+	;;
+	ldf.fill f23 = [r21], 32	// sp + 336 (f23)
+	ldf.fill f24 = [r20], 32	// sp + 352 (f24)
+	;;
+	ldf.fill f25 = [r21], 32	// sp + 368 (f25)
+	ldf.fill f26 = [r20], 32	// sp + 384 (f26)
+	;;
+	ldf.fill f27 = [r21], 32	// sp + 400 (f27)
+	ldf.fill f28 = [r20], 32	// sp + 416 (f28)
+	;;
+	ldf.fill f29 = [r21], 32	// sp + 432 (f29)
+	ldf.fill f30 = [r20], 32	// sp + 448 (f30)
+	;;
+	ldf.fill f31 = [r21], 32	// sp + 464 (f31)
+	mov r12 = r20
+	br.ret.sptk.many b0
+	;;
+	.endp grt_stack_switch#
+	
+	.align 16
+	// r32:	 func, r33: arg
+	.global grt_stack_create#
+	.proc grt_stack_create#
+grt_stack_create:
+	.prologue 14, 34
+	.save ar.pfs, r35
+	alloc r35 = ar.pfs, 2, 3, 0, 0
+	.save rp, r34
+	//  Compute backing store.
+	movl r14 = stack_max_size
+	;; 
+	.body
+	{
+	ld4 r36 = [r14]		// r14: bsp
+	mov r34 = b0
+	br.call.sptk.many b0 = grt_stack_allocate#
+	;;
+	}
+	{
+	ld8 r22 = [r32], 8	// read ip (-> b1)
+	;;
+	ld8 r23 = [r32]		// read r1 from func
+	adds r21 = -(frame_size + 16) + 32, r8
+	;;
+	}
+	{
+	st8 [r21] = r0, -32	// sp + 32 (ar.rnat = 0)
+	;; 
+	st8 [r8] = r21		// Save cur_sp
+	mov r18 = 0x0f		// ar.rsc: LE, PL=3, Eager
+	;;
+	}
+	{
+	st8 [r21] = r18, 40	// sp + 0 (ar.rsc)
+	;;
+	st8 [r21] = r23, 64	// sp + 40 (r1 = func.r1)
+	mov b0 = r34
+	;;
+	}
+	{
+	st8 [r21] = r22, -96	// sp + 104 (b1 = func.ip)
+	movl r15 = grt_stack_loop
+	;; 
+	}	
+	sub r14 = r8, r36	// Backing store base
+	;;
+	adds r14 = 16, r14	// Add sizeof (stack_context)
+	adds r20 = 40, r21
+	;;
+	{
+	st8 [r21] = r14, 88	// sp + 8 (ar.bsp)
+	;; 
+	st8 [r21] = r15, -80	// sp + 96 (b0 = grt_stack_loop)
+	mov r16 = (0 << 7) | 1	// CFM:	sol=0, sof=1
+	;;
+	}
+	{
+	st8 [r21] = r16, 8	// sp + 16 (ar.pfs)
+	;; 
+	st8 [r21] = r0, 24	// sp + 24 (ar.lc)
+	mov ar.pfs = r35
+	;;
+	}
+	{
+	st8 [r20] = r0, 8	// sp + 32 (ar.rnat)
+	st8 [r21] = r33		// sp + 48 (r4 = arg)
+	br.ret.sptk.many b0
+	;;
+	}
+	.endp grt_stack_create#
+	.ident	"GCC: (GNU) 4.0.2"
diff --git a/src/grt/config/linux.c b/src/grt/config/linux.c
new file mode 100644
index 0000000..74dce09
--- /dev/null
+++ b/src/grt/config/linux.c
@@ -0,0 +1,361 @@
+/*  GRT stacks implementation for linux and other *nix.
+    Copyright (C) 2002 - 2014 Tristan Gingold.
+
+    GHDL is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2, or (at your option) any later
+    version.
+
+    GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+
+    As a special exception, if other files instantiate generics from this
+    unit, or you link this unit with other files to produce an executable,
+    this unit does not by itself cause the resulting executable to be
+    covered by the GNU General Public License. This exception does not
+    however invalidate any other reasons why the executable file might be
+    covered by the GNU Public License.
+*/
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/mman.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <sys/ucontext.h>
+#include <stdlib.h>
+//#include <stdint.h>
+
+#ifdef __APPLE__
+#define MAP_ANONYMOUS MAP_ANON
+#endif
+
+/* On x86, the stack growns downward.  */
+#define STACK_GROWNS_DOWNWARD 1
+
+#ifdef __linux__
+/* If set, SIGSEGV is caught in order to automatically grow the stacks.  */
+#define EXTEND_STACK 1
+#define STACK_SIGNAL SIGSEGV
+#endif
+#ifdef __FreeBSD__
+/* If set, SIGSEGV is caught in order to automatically grow the stacks.  */
+#define EXTEND_STACK 1
+#define STACK_SIGNAL SIGSEGV
+#endif
+#ifdef __APPLE__
+/* If set, SIGSEGV is caught in order to automatically grow the stacks.  */
+#define EXTEND_STACK 1
+#define STACK_SIGNAL SIGBUS
+#endif
+
+/* Defined in Grt.Options.  */
+extern unsigned int stack_size;
+extern unsigned int stack_max_size;
+
+/* Size of a memory page.  */
+static size_t page_size;
+
+extern void grt_stack_error_grow_failed (void);
+extern void grt_stack_error_null_access (void);
+extern void grt_stack_error_memory_access (void);
+extern void grt_overflow_error (void);
+
+/* Definitions:
+   The base of the stack is the address before the first available byte on the
+     stack.  If the stack grows downward, the base is equal to the high bound.
+*/
+   
+/* Per stack context.
+   This context is allocated at the top (or bottom if the stack grows
+   upward) of the stack.
+   Therefore, the base of the stack can be easily deduced from the context.  */
+struct stack_context
+{
+  /* The current stack pointer.  */
+  void *cur_sp;
+  /* The current stack length.  */
+  size_t cur_length;
+};
+
+/* If MAP_ANONYMOUS is not defined, use /dev/zero. */
+#ifndef MAP_ANONYMOUS
+#define USE_DEV_ZERO
+static int dev_zero_fd;
+#define MAP_ANONYMOUS 0
+#define MMAP_FILEDES dev_zero_fd
+#else
+#define MMAP_FILEDES -1
+#endif
+
+#if EXTEND_STACK
+/* This is the current process being run.  */
+extern struct stack_context *grt_get_current_process (void);
+
+/* Stack used for signals.
+   The stack must be different from the running stack, because we want to be
+   able to extend the running stack.  When the stack need to be extended, the
+   current stack pointer does not point to a valid address.  Therefore, the
+   stack cannot be used or else a second SIGSEGV is generated while the
+   arguments are pushed.  */
+static unsigned long sig_stack[SIGSTKSZ / sizeof (long)];
+
+/* Signal stack descriptor.  */
+static stack_t sig_stk;
+
+static struct sigaction prev_sigsegv_act;
+static struct sigaction sigsegv_act;
+
+/* The following code assumes stack grows downward.  */
+#if !STACK_GROWNS_DOWNWARD
+#error "Not implemented"
+#endif
+
+#ifdef __APPLE__
+/* Handler for SIGFPE signal, raised in case of overflow (i386).  */
+static void grt_overflow_handler (int signo, siginfo_t *info, void *ptr)
+{
+  grt_overflow_error ();
+}
+#endif
+
+/* Handler for SIGSEGV signal, which grow the stack.  */
+static void grt_sigsegv_handler (int signo, siginfo_t *info, void *ptr)
+{
+  static int in_handler;
+  void *addr;
+  struct stack_context *ctxt;
+  void *stack_high;
+  void *stack_low;
+  void *n_low;
+  size_t n_len;
+  ucontext_t *uctxt = (ucontext_t *)ptr;
+
+  in_handler++;
+
+#ifdef __linux__
+#ifdef __i386__
+  /* Linux generates a SIGSEGV (!) for an overflow exception.  */
+  if (uctxt->uc_mcontext.gregs[REG_TRAPNO] == 4)
+    {
+      grt_overflow_error ();
+    }
+#endif
+#endif
+
+  if (info == NULL || grt_get_current_process () == NULL || in_handler > 1)
+    {
+      /* We loose.  */
+      sigaction (STACK_SIGNAL, &prev_sigsegv_act, NULL);
+      return;
+    }
+
+  addr = info->si_addr;
+
+  /* Check ADDR belong to the stack.  */
+  ctxt = grt_get_current_process ()->cur_sp;
+  stack_high = (void *)(ctxt + 1);
+  stack_low = stack_high - stack_max_size;
+  if (addr > stack_high || addr < stack_low)
+    {
+      /* Out of the stack.  */
+      if (addr < (void *)page_size)
+	grt_stack_error_null_access ();
+      else
+	grt_stack_error_memory_access ();
+    }
+  /* Compute the address of the faulting page.  */
+  n_low = (void *)((unsigned long)addr & ~(page_size - 1));
+
+  /* Should not happen.  */
+  if (n_low < stack_low)
+    abort ();
+
+  /*  Allocate one more page, if possible.  */
+  if (n_low != stack_low)
+    n_low -= page_size;
+
+  /* Compute the new length.  */
+  n_len = stack_high - n_low;
+
+  if (mmap (n_low, n_len - ctxt->cur_length,  PROT_READ | PROT_WRITE,
+	    MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, MMAP_FILEDES, 0)
+      != n_low)
+    {
+      /* Cannot grow the stack.  */
+      grt_stack_error_grow_failed ();
+    }
+
+  ctxt->cur_length = n_len;
+
+  sigaction (STACK_SIGNAL, &sigsegv_act, NULL);
+
+  in_handler--;
+
+  /* Hopes we can resume!  */
+  return;
+}
+
+static void grt_signal_setup (void)
+{
+  sigsegv_act.sa_sigaction = &grt_sigsegv_handler;
+  sigemptyset (&sigsegv_act.sa_mask);
+  sigsegv_act.sa_flags = SA_ONSTACK | SA_SIGINFO;
+#ifdef SA_ONESHOT
+  sigsegv_act.sa_flags |= SA_ONESHOT;
+#elif defined (SA_RESETHAND)
+  sigsegv_act.sa_flags |= SA_RESETHAND;
+#endif
+
+  /* Use an alternate stack during signals.  */
+  sig_stk.ss_sp = sig_stack;
+  sig_stk.ss_size = sizeof (sig_stack);
+  sig_stk.ss_flags = 0;
+  sigaltstack (&sig_stk, NULL);
+
+  /* We don't care about the return status.
+     If the handler is not installed, then some feature are lost.  */
+  sigaction (STACK_SIGNAL, &sigsegv_act, &prev_sigsegv_act);
+
+#ifdef __APPLE__
+  {
+    struct sigaction sig_ovf_act;
+
+    sig_ovf_act.sa_sigaction = &grt_overflow_handler;
+    sigemptyset (&sig_ovf_act.sa_mask);
+    sig_ovf_act.sa_flags = SA_SIGINFO;
+
+    sigaction (SIGFPE, &sig_ovf_act, NULL);
+  }
+#endif
+}
+#endif
+
+/* Context for the main stack.  */
+#ifdef USE_THREADS
+#define THREAD __thread
+#else
+#define THREAD
+#endif
+static THREAD struct stack_context main_stack_context;
+
+extern void grt_set_main_stack (struct stack_context *stack);
+
+void
+grt_stack_new_thread (void)
+{
+  main_stack_context.cur_sp = NULL;
+  main_stack_context.cur_length = 0;
+  grt_set_main_stack (&main_stack_context);
+}
+
+void
+grt_stack_init (void)
+{
+  size_t pg_round;
+
+  page_size = getpagesize ();
+  pg_round = page_size - 1;
+
+  /* Align size.  */
+  stack_size = (stack_size + pg_round) & ~pg_round;
+  stack_max_size = (stack_max_size + pg_round) & ~pg_round;
+
+  /* Set mimum values.  */
+  if (stack_size < 2 * page_size)
+    stack_size = 2 * page_size;
+  if (stack_max_size < (stack_size + 2 * page_size))
+    stack_max_size = stack_size + 2 * page_size;
+
+  /* Initialize the main stack context.  */
+  main_stack_context.cur_sp = NULL;
+  main_stack_context.cur_length = 0;
+  grt_set_main_stack (&main_stack_context);
+
+#ifdef USE_DEV_ZERO
+  dev_zero_fd = open ("/dev/zero", O_RDWR);
+  if (dev_zero_fd < 0)
+    abort ();
+#endif
+
+#if EXTEND_STACK
+  grt_signal_setup ();
+#endif
+}
+
+/* Allocate a stack.
+   Called by i386.S  */
+struct stack_context *
+grt_stack_allocate (void)
+{
+  struct stack_context *res;
+  void *r;
+  void *base;
+
+  /* Allocate the stack, but without any rights.  This is a guard.  */
+  base = (void *)mmap (NULL, stack_max_size, PROT_NONE,
+		       MAP_PRIVATE | MAP_ANONYMOUS, MMAP_FILEDES, 0);
+
+  if (base == (void *)-1)
+    return NULL;
+
+  /* Set rights on the allocated stack.  */
+#if STACK_GROWNS_DOWNWARD
+  r = base + stack_max_size - stack_size;
+#else
+  r = base;
+#endif
+  if (mmap (r, stack_size,  PROT_READ | PROT_WRITE,
+	    MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, MMAP_FILEDES, 0)
+      != r)
+    return NULL;
+
+#if STACK_GROWNS_DOWNWARD
+  res = (struct stack_context *)
+    (base + stack_max_size - sizeof (struct stack_context));
+#else
+  res = (struct stack_context *)(base + sizeof (struct stack_context));
+#endif
+
+#ifdef __ia64__
+  /* Also allocate BSP.  */
+  if (mmap (base, page_size, PROT_READ | PROT_WRITE,
+	    MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, MMAP_FILEDES, 0) != base)
+    return NULL;
+#endif
+
+  res->cur_sp = (void *)res;
+  res->cur_length = stack_size;
+  return res;
+}
+
+#include <setjmp.h>
+static int run_env_en;
+static jmp_buf run_env;
+
+void
+__ghdl_maybe_return_via_longjump (int val)
+{
+  if (run_env_en)
+    longjmp (run_env, val);
+}
+
+int
+__ghdl_run_through_longjump (int (*func)(void))
+{
+  int res;
+
+  run_env_en = 1;
+  res = setjmp (run_env);
+  if (res == 0)
+    res = (*func)();
+  run_env_en = 0;
+  return res;
+}
+
diff --git a/src/grt/config/ppc.S b/src/grt/config/ppc.S
new file mode 100644
index 0000000..bedd48a
--- /dev/null
+++ b/src/grt/config/ppc.S
@@ -0,0 +1,334 @@
+/*  GRT stack implementation for ppc.
+    Copyright (C) 2005 - 2014 Tristan Gingold.
+
+    GHDL is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2, or (at your option) any later
+    version.
+
+    GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+
+    As a special exception, if other files instantiate generics from this
+    unit, or you link this unit with other files to produce an executable,
+    this unit does not by itself cause the resulting executable to be
+    covered by the GNU General Public License. This exception does not
+    however invalidate any other reasons why the executable file might be
+    covered by the GNU Public License.
+*/
+	.file		"ppc.S"
+	
+	.section	".text"
+
+#define OFF 240
+
+#define GREG(x) x
+#define FREG(x) x
+	
+#define r0 GREG(0)
+#define r1 GREG(1)
+#define r2 GREG(2)
+#define r3 GREG(3)
+#define r4 GREG(4)
+#define r5 GREG(5)
+#define r6 GREG(6)
+#define r7 GREG(7)
+#define r8 GREG(8)
+#define r9 GREG(9)
+#define r10 GREG(10)
+#define r11 GREG(11)
+#define r12 GREG(12)
+#define r13 GREG(13)
+#define r14 GREG(14)
+#define r15 GREG(15)
+#define r16 GREG(16)
+#define r17 GREG(17)
+#define r18 GREG(18)
+#define r19 GREG(19)
+#define r20 GREG(20)
+#define r21 GREG(21)
+#define r22 GREG(22)
+#define r23 GREG(23)
+#define r24 GREG(24)
+#define r25 GREG(25)
+#define r26 GREG(26)
+#define r27 GREG(27)
+#define r28 GREG(28)
+#define r29 GREG(29)
+#define r30 GREG(30)
+#define r31 GREG(31)
+
+#define f0 FREG(0)
+#define f1 FREG(1)
+#define f2 FREG(2)
+#define f3 FREG(3)
+#define f4 FREG(4)
+#define f5 FREG(5)
+#define f6 FREG(6)
+#define f7 FREG(7)
+#define f8 FREG(8)
+#define f9 FREG(9)
+#define f10 FREG(10)
+#define f11 FREG(11)
+#define f12 FREG(12)
+#define f13 FREG(13)
+#define f14 FREG(14)
+#define f15 FREG(15)
+#define f16 FREG(16)
+#define f17 FREG(17)
+#define f18 FREG(18)
+#define f19 FREG(19)
+#define f20 FREG(20)
+#define f21 FREG(21)
+#define f22 FREG(22)
+#define f23 FREG(23)
+#define f24 FREG(24)
+#define f25 FREG(25)
+#define f26 FREG(26)
+#define f27 FREG(27)
+#define f28 FREG(28)
+#define f29 FREG(29)
+#define f30 FREG(30)
+#define f31 FREG(31)
+
+	/* Stack structure is:
+           +4 :	cur_length   \  Stack
+	   +0 :	cur_sp       /  Context
+	   -4 :	arg
+	   -8 :	func
+	
+	   -12:	pad
+	   -16: pad
+           -20: LR save word
+	   -24:	Back chain
+	
+	   -28: fp/gp saved registers. 
+	   -4 :	return address
+	   -8 :	process function to be executed
+           -12:	function argument
+	   ...
+           -72:	%sp
+	*/
+	
+	/* Function called to loop on the process.  */	
+	.align 4
+	.type	grt_stack_loop,@function
+grt_stack_loop:
+	/* Get function.  */
+	lwz	r0,16(r1)
+	/* Get argument.  */
+	lwz	r3,20(r1)
+	mtlr	r0
+	blrl
+	b	grt_stack_loop
+	.size	grt_stack_loop, . - grt_stack_loop
+
+	/* function Stack_Create (Func : Address; Arg : Address)
+	                         return Stack_Type;  */
+	.align	4
+	.global grt_stack_create
+	.type	 grt_stack_create,@function
+grt_stack_create:
+	/* Standard prologue.  */
+	stwu	r1,-32(r1)
+	mflr	r0
+	stw	r0,36(r1)
+
+	/* Save arguments.  */
+	stw	r3,24(r1)
+	stw	r4,28(r1)
+	
+	/* Allocate the stack, and exit in case of failure  */
+	bl	grt_stack_allocate
+	cmpwi	0,r3,0
+	beq-	.Ldone
+
+	/* Note: r3 contains the address of the stack_context.  This is
+	   also the top of the stack.  */
+				
+	/* Prepare stack.  */
+	/* Align the stack.  */
+	addi	r5,r3,-24
+
+	/* Save the parameters.  */
+	lwz	r6,24(r1)
+	stw	r6,16(r5)
+	lwz	r7,28(r1)
+	stw	r7,20(r5)
+	
+	/* The return function.  */
+	lis	r4,grt_stack_loop@ha
+	la	r4,grt_stack_loop@l(r4)
+	stw	r4,4(r5)
+	/* Back-Chain.  */
+	addi	r4,r1,32
+	stw	r4,0(r5)
+
+	/* Save register.
+	   They should be considered as garbage.  */
+	addi	r4,r5,-OFF
+	
+	stfd	f31,(OFF - 8)(r4)
+	stfd	f30,(OFF - 16)(r4)
+	stfd	f29,(OFF - 24)(r4)
+	stfd	f28,(OFF - 32)(r4)
+	stfd	f27,(OFF - 40)(r4)
+	stfd	f26,(OFF - 48)(r4)
+	stfd	f25,(OFF - 56)(r4)
+	stfd	f24,(OFF - 64)(r4)
+	stfd	f23,(OFF - 72)(r4)
+	stfd	f22,(OFF - 80)(r4)
+	stfd	f21,(OFF - 88)(r4)
+	stfd	f20,(OFF - 96)(r4)
+	stfd	f19,(OFF - 104)(r4)
+	stfd	f18,(OFF - 112)(r4)
+	stfd	f17,(OFF - 120)(r4)
+	stfd	f16,(OFF - 128)(r4)
+	stfd	f15,(OFF - 136)(r4)
+	stfd	f14,(OFF - 144)(r4)
+	stw	r31,(OFF - 148)(r4)
+	stw	r30,(OFF - 152)(r4)
+	stw	r29,(OFF - 156)(r4)
+	stw	r28,(OFF - 160)(r4)
+	stw	r27,(OFF - 164)(r4)
+	stw	r26,(OFF - 168)(r4)
+	stw	r25,(OFF - 172)(r4)
+	stw	r24,(OFF - 176)(r4)
+	stw	r23,(OFF - 180)(r4)
+	stw	r22,(OFF - 184)(r4)
+	stw	r21,(OFF - 188)(r4)
+	stw	r20,(OFF - 192)(r4)
+	stw	r19,(OFF - 196)(r4)
+	stw	r18,(OFF - 200)(r4)
+	stw	r17,(OFF - 204)(r4)
+	stw	r16,(OFF - 208)(r4)
+	stw	r15,(OFF - 212)(r4)
+	stw	r14,(OFF - 216)(r4)
+	mfcr	r0
+	stw	r0, (OFF - 220)(r4)
+
+	/* Save stack pointer.  */
+	stw	r4, 0(r3)
+
+.Ldone:
+	lwz	r0,36(r1)
+	mtlr	r0
+	addi	r1,r1,32
+	blr
+	.size	 grt_stack_create,. - grt_stack_create
+
+
+	.align 4
+	.global grt_stack_switch
+	/* Arguments:	TO, FROM.
+	   Both are pointers to a stack_context.  */
+	.type	 grt_stack_switch,@function
+grt_stack_switch:
+	/* Standard prologue, save return address.  */
+	stwu	r1,(-OFF)(r1)
+	mflr	r0
+	stw	r0,(OFF + 4)(r1)
+
+	/* Save r14-r31, f14-f31, CR
+	   This is 18 words + 18 double words, ie 216 bytes.  */
+	/* Maybe use the savefpr function ? */
+	stfd	f31,(OFF - 8)(r1)
+	stfd	f30,(OFF - 16)(r1)
+	stfd	f29,(OFF - 24)(r1)
+	stfd	f28,(OFF - 32)(r1)
+	stfd	f27,(OFF - 40)(r1)
+	stfd	f26,(OFF - 48)(r1)
+	stfd	f25,(OFF - 56)(r1)
+	stfd	f24,(OFF - 64)(r1)
+	stfd	f23,(OFF - 72)(r1)
+	stfd	f22,(OFF - 80)(r1)
+	stfd	f21,(OFF - 88)(r1)
+	stfd	f20,(OFF - 96)(r1)
+	stfd	f19,(OFF - 104)(r1)
+	stfd	f18,(OFF - 112)(r1)
+	stfd	f17,(OFF - 120)(r1)
+	stfd	f16,(OFF - 128)(r1)
+	stfd	f15,(OFF - 136)(r1)
+	stfd	f14,(OFF - 144)(r1)
+	stw	r31,(OFF - 148)(r1)
+	stw	r30,(OFF - 152)(r1)
+	stw	r29,(OFF - 156)(r1)
+	stw	r28,(OFF - 160)(r1)
+	stw	r27,(OFF - 164)(r1)
+	stw	r26,(OFF - 168)(r1)
+	stw	r25,(OFF - 172)(r1)
+	stw	r24,(OFF - 176)(r1)
+	stw	r23,(OFF - 180)(r1)
+	stw	r22,(OFF - 184)(r1)
+	stw	r21,(OFF - 188)(r1)
+	stw	r20,(OFF - 192)(r1)
+	stw	r19,(OFF - 196)(r1)
+	stw	r18,(OFF - 200)(r1)
+	stw	r17,(OFF - 204)(r1)
+	stw	r16,(OFF - 208)(r1)
+	stw	r15,(OFF - 212)(r1)
+	stw	r14,(OFF - 216)(r1)
+	mfcr	r0
+	stw	r0, (OFF - 220)(r1)
+	
+	/* Save stack pointer.  */
+	stw	r1, 0(r4)
+
+	/* Load stack pointer.  */
+	lwz	r1, 0(r3)
+			
+
+	lfd	f31,(OFF - 8)(r1)
+	lfd	f30,(OFF - 16)(r1)
+	lfd	f29,(OFF - 24)(r1)
+	lfd	f28,(OFF - 32)(r1)
+	lfd	f27,(OFF - 40)(r1)
+	lfd	f26,(OFF - 48)(r1)
+	lfd	f25,(OFF - 56)(r1)
+	lfd	f24,(OFF - 64)(r1)
+	lfd	f23,(OFF - 72)(r1)
+	lfd	f22,(OFF - 80)(r1)
+	lfd	f21,(OFF - 88)(r1)
+	lfd	f20,(OFF - 96)(r1)
+	lfd	f19,(OFF - 104)(r1)
+	lfd	f18,(OFF - 112)(r1)
+	lfd	f17,(OFF - 120)(r1)
+	lfd	f16,(OFF - 128)(r1)
+	lfd	f15,(OFF - 136)(r1)
+	lfd	f14,(OFF - 144)(r1)
+	lwz	r31,(OFF - 148)(r1)
+	lwz	r30,(OFF - 152)(r1)
+	lwz	r29,(OFF - 156)(r1)
+	lwz	r28,(OFF - 160)(r1)
+	lwz	r27,(OFF - 164)(r1)
+	lwz	r26,(OFF - 168)(r1)
+	lwz	r25,(OFF - 172)(r1)
+	lwz	r24,(OFF - 176)(r1)
+	lwz	r23,(OFF - 180)(r1)
+	lwz	r22,(OFF - 184)(r1)
+	lwz	r21,(OFF - 188)(r1)
+	lwz	r20,(OFF - 192)(r1)
+	lwz	r19,(OFF - 196)(r1)
+	lwz	r18,(OFF - 200)(r1)
+	lwz	r17,(OFF - 204)(r1)
+	lwz	r16,(OFF - 208)(r1)
+	lwz	r15,(OFF - 212)(r1)
+	lwz	r14,(OFF - 216)(r1)
+	lwz	r0, (OFF - 220)(r1)
+	mtcr	r0
+
+	lwz	r0,(OFF + 4)(r1)
+	mtlr	r0
+	addi	r1,r1,OFF
+	blr
+	.size	 grt_stack_switch, . - grt_stack_switch
+
+	
+	.ident	"Written by T.Gingold"
diff --git a/src/grt/config/pthread.c b/src/grt/config/pthread.c
new file mode 100644
index 0000000..189ae90
--- /dev/null
+++ b/src/grt/config/pthread.c
@@ -0,0 +1,239 @@
+/*  GRT stack implementation based on pthreads.
+    Copyright (C) 2003 - 2014 Felix Bertram & Tristan Gingold.
+
+    GHDL is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2, or (at your option) any later
+    version.
+
+    GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+*/
+//-----------------------------------------------------------------------------
+// Project:     GHDL - VHDL Simulator
+// Description: pthread port of stacks package, for use with MacOSX
+// Note:        Tristan's original i386/Linux used assembly-code
+//              to manually switch stacks for performance reasons.
+// History:     2003may22, FB, created.
+//-----------------------------------------------------------------------------
+
+#include <pthread.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <setjmp.h>
+#include <assert.h>
+
+//#define INFO printf
+#define INFO (void)
+
+// GHDL names an endless loop calling FUNC with ARG a 'stack'
+// at a given time, only one stack may be 'executed'
+typedef struct
+{
+  pthread_t           thread;         // stack's thread
+  pthread_mutex_t     mutex;          // mutex to suspend/resume thread
+#if defined(__CYGWIN__)
+  pthread_mutexattr_t mxAttr;
+#endif
+  void                (*Func)(void*); // stack's FUNC
+  void*               Arg;            // ARG passed to FUNC
+} Stack_Type_t, *Stack_Type;
+
+static Stack_Type_t      main_stack_context;
+static Stack_Type_t	 *current;
+extern void grt_set_main_stack (Stack_Type_t *stack);
+
+//----------------------------------------------------------------------------
+void grt_stack_init(void)
+// Initialize the stacks package.
+// This may adjust stack sizes.
+// Must be called after grt.options.decode.
+// => procedure Stack_Init;
+{
+  int res;
+  INFO("grt_stack_init\n");
+  INFO("  main_stack_context=0x%08x\n", &main_stack_context);
+
+
+#if defined(__CYGWIN__)
+  res = pthread_mutexattr_init (&main_stack_context.mxAttr);
+  assert (res == 0);
+  res = pthread_mutexattr_settype (&main_stack_context.mxAttr,
+				   PTHREAD_MUTEX_DEFAULT);
+  assert (res == 0);
+  res = pthread_mutex_init (&main_stack_context.mutex,
+			    &main_stack_context.mxAttr);
+  assert (res == 0);
+#else
+  res = pthread_mutex_init (&main_stack_context.mutex, NULL);
+  assert (res == 0);
+#endif
+  // lock the mutex, as we are currently running
+  res = pthread_mutex_lock (&main_stack_context.mutex);
+  assert (res == 0);
+
+  current = &main_stack_context;
+
+  grt_set_main_stack (&main_stack_context);
+}
+
+//----------------------------------------------------------------------------
+static void* grt_stack_loop(void* pv_myStack)
+{
+  Stack_Type myStack= (Stack_Type)pv_myStack;
+
+  INFO("grt_stack_loop\n");
+
+  INFO("  myStack=0x%08x\n", myStack);
+
+  // block until mutex becomes available again.
+  // this happens when this stack is enabled for the first time
+  pthread_mutex_lock(&(myStack->mutex));
+
+  // run stack's function in endless loop
+  while(1)
+    {
+      INFO("  call 0x%08x with 0x%08x\n", myStack->Func, myStack->Arg);
+      myStack->Func(myStack->Arg);
+    }
+
+  // we never get here...
+  return 0;
+}
+
+//----------------------------------------------------------------------------
+Stack_Type grt_stack_create(void* Func, void* Arg)
+// Create a new stack, which on first execution will call FUNC with
+// an argument ARG.
+// => function Stack_Create (Func : Address; Arg : Address) return Stack_Type;
+{
+  Stack_Type newStack;
+  int res;
+
+  INFO("grt_stack_create\n");
+  INFO("  call 0x%08x with 0x%08x\n", Func, Arg);
+
+  newStack = malloc (sizeof(Stack_Type_t));
+
+  // init function and argument
+  newStack->Func = Func;
+  newStack->Arg = Arg;
+
+  // create mutex
+#if defined(__CYGWIN__)
+  res = pthread_mutexattr_init (&newStack->mxAttr);
+  assert (res == 0);
+  res = pthread_mutexattr_settype (&newStack->mxAttr, PTHREAD_MUTEX_DEFAULT);
+  assert (res == 0);
+  res = pthread_mutex_init (&newStack->mutex, &newStack->mxAttr);
+  assert (res == 0);
+#else
+  res = pthread_mutex_init (&newStack->mutex, NULL);
+  assert (res == 0);
+#endif
+
+  // block the mutex, so that thread will blocked in grt_stack_loop
+  res = pthread_mutex_lock (&newStack->mutex);
+  assert (res == 0);
+
+  INFO("  newStack=0x%08x\n", newStack);
+
+  // create thread, which executes grt_stack_loop
+  pthread_create (&newStack->thread, NULL, grt_stack_loop, newStack);
+
+  return newStack;
+}
+
+static int need_longjmp;
+static int run_env_en;
+static jmp_buf run_env;
+
+//----------------------------------------------------------------------------
+void grt_stack_switch(Stack_Type To, Stack_Type From)
+// Resume stack TO and save the current context to the stack pointed by
+// CUR.
+// => procedure Stack_Switch (To : Stack_Type; From : Stack_Type);
+{
+  int res;
+  INFO("grt_stack_switch\n");
+  INFO("  from 0x%08x to 0x%08x\n", From, To);
+
+  current = To;
+
+  // unlock 'To' mutex. this will make the other thread either
+  // - starts for first time in grt_stack_loop
+  // - resumes at lock below
+  res = pthread_mutex_unlock (&To->mutex);
+  assert (res == 0);
+
+  // block until 'From' mutex becomes available again
+  // as we are running, our mutex is locked and we block here
+  // when stacks are switched, with above unlock, we may proceed
+  res = pthread_mutex_lock (&From->mutex);
+  assert (res == 0);
+
+  if (From == &main_stack_context && need_longjmp != 0)
+    longjmp (run_env, need_longjmp);
+}
+
+//----------------------------------------------------------------------------
+void grt_stack_delete(Stack_Type Stack)
+// Delete stack STACK, which must not be currently executed.
+// => procedure Stack_Delete (Stack : Stack_Type);
+{
+  INFO("grt_stack_delete\n");
+}
+
+void
+__ghdl_maybe_return_via_longjump (int val)
+{
+  if (!run_env_en)
+    return;
+
+  if (current != &main_stack_context)
+    {
+      need_longjmp = val;
+      grt_stack_switch (&main_stack_context, current);
+    }
+  else
+    longjmp (run_env, val);
+}
+
+int
+__ghdl_run_through_longjump (int (*func)(void))
+{
+  int res;
+
+  run_env_en = 1;
+  res = setjmp (run_env);
+  if (res == 0)
+    res = (*func)();
+  run_env_en = 0;
+  return res;
+}
+
+
+//----------------------------------------------------------------------------
+
+#ifndef WITH_GNAT_RUN_TIME
+void __gnat_raise_storage_error(void)
+{
+   abort ();
+}
+
+void __gnat_raise_program_error(void)
+{
+   abort ();
+}
+#endif /* WITH_GNAT_RUN_TIME */
+
+//----------------------------------------------------------------------------
+// end of file
+
diff --git a/src/grt/config/sparc.S b/src/grt/config/sparc.S
new file mode 100644
index 0000000..0ffe412
--- /dev/null
+++ b/src/grt/config/sparc.S
@@ -0,0 +1,141 @@
+/*  GRT stack implementation for x86.
+    Copyright (C) 2002 - 2014 Tristan Gingold.
+
+    GHDL is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2, or (at your option) any later
+    version.
+
+    GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+
+    As a special exception, if other files instantiate generics from this
+    unit, or you link this unit with other files to produce an executable,
+    this unit does not by itself cause the resulting executable to be
+    covered by the GNU General Public License. This exception does not
+    however invalidate any other reasons why the executable file might be
+    covered by the GNU Public License.
+*/
+	.file		"sparc.S"
+	
+	.section	".text"
+
+	/* Stack structure is:
+           +4 :	cur_length
+	   +0 :	cur_sp
+	   -4 :	return address
+	   -8 :	process function to be executed
+           -12:	function argument
+	   ...
+           -72:	%sp
+	*/
+	
+	/* Function called to loop on the process.  */	
+	.align 4
+	.type	grt_stack_loop,#function
+grt_stack_loop:
+	ld	[%sp + 64], %o1
+	jmpl	%o1 + 0, %o7
+	ld	[%sp + 68], %o0
+	ba	grt_stack_loop
+	nop
+	.size	grt_stack_loop, . - grt_stack_loop
+
+	/* function Stack_Create (Func : Address; Arg : Address)
+	                         return Stack_Type;  */
+	.align	4
+	.global grt_stack_create
+	.type	 grt_stack_create,#function
+grt_stack_create:
+	/* Standard prologue.  */
+	save	%sp,-80,%sp
+	
+	/* Allocate the stack, and exit in case of failure  */
+	call	grt_stack_allocate
+	nop
+	cmp	%o0, 0
+	be	.Ldone
+	nop
+
+	/* Note: %o0 contains the address of the stack_context.  This is
+	   also the top of the stack.  */
+				
+	/* Prepare stack.  */
+
+	/* The return function.  */
+	sethi	%hi(grt_stack_loop - 8), %l2
+	or	%lo(grt_stack_loop - 8), %l2, %l2
+
+	/* Create a frame for grt_stack_loop. */
+	sub	%o0, (64 + 8), %l1
+
+	/* The function to be executed.  */
+	st	%i0, [%l1 + 64]
+	/* The argument.  */
+	st	%i1, [%l1 + 68]
+
+	/* Create a frame for grt_stack_switch.  */
+	sub	%l1, 64, %l0
+
+	/* Save frame pointer.  */
+	st	%l1, [%l0 + 56]
+	/* Save return address.  */
+	st	%l2, [%l0 + 60]
+
+	/* Save stack pointer.  */
+	st	%l0, [%o0]
+
+.Ldone:
+	ret
+	restore %o0, %g0, %o0
+	.size	 grt_stack_create,. - grt_stack_create
+
+
+	.align 4
+	.global grt_stack_switch
+	/* Arguments:	TO, FROM.
+	   Both are pointers to a stack_context.  */
+	.type	 grt_stack_switch,#function
+grt_stack_switch:
+	/* Standard prologue.  */
+	save	%sp,-80,%sp
+
+	/* Flush and invalidate windows.
+	   It is not clear wether the current window is saved or not,
+	    therefore, I assume it is not.
+	*/
+	ta	3
+
+	/* Only IN registers %fp and %i7 (return address) must be saved.
+	   Of course, I could use std/ldd, but it is not as clear
+	*/
+	/* Save current frame pointer.  */
+	st	%fp, [%sp + 56]
+	/* Save return address.  */
+	st	%i7, [%sp + 60]
+
+	/* Save stack pointer.  */
+	st	%sp, [%i1]
+
+	/* Load stack pointer.  */
+	ld	[%i0], %sp
+	
+	/* Load return address.  */
+	ld	[%sp + 60], %i7
+	/* Load frame pointer.  */
+	ld	[%sp + 56], %fp
+
+	/* Return.  */
+	ret
+	restore	
+	.size	 grt_stack_switch, . - grt_stack_switch
+
+	
+	.ident	"Written by T.Gingold"
diff --git a/src/grt/config/teststack.c b/src/grt/config/teststack.c
new file mode 100644
index 0000000..6a6966d
--- /dev/null
+++ b/src/grt/config/teststack.c
@@ -0,0 +1,174 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+extern void grt_stack_init (void);
+extern void grt_stack_switch (void *from, void *to);
+extern void *grt_stack_create (void (*func)(void *), void *arg);
+
+int stack_size = 4096;
+int stack_max_size = 8 * 4096;
+
+static void *stack1;
+static void *stack2;
+void *grt_stack_main_stack;
+
+void *grt_cur_proc;
+
+static int step;
+
+void
+grt_overflow_error (void)
+{
+  abort ();
+}
+
+void
+grt_stack_error_null_access (void)
+{
+  abort ();
+}
+
+void
+grt_stack_error_memory_access (void)
+{
+  abort ();
+}
+
+void
+grt_stack_error_grow_failed (void)
+{
+  abort ();
+}
+
+void
+error (void)
+{
+  printf ("Test failure at step %d\n", step);
+  fflush (stdout);
+  exit (1);
+}
+
+static void
+func1 (void *ptr)
+{
+  if (ptr != (void *)1)
+    error ();
+
+  if (step != 0)
+    error ();
+
+  step = 1;
+
+  grt_stack_switch (grt_stack_main_stack, stack1);
+
+  if (step != 5)
+    error ();
+
+  step = 6;
+
+  grt_stack_switch (grt_stack_main_stack, stack1);
+
+  if (step != 7)
+    error ();
+
+  step = 8;
+
+  grt_stack_switch (stack2, stack1);
+
+  if (step != 9)
+    error ();
+
+  step = 10;
+
+  grt_stack_switch (grt_stack_main_stack, stack1);
+
+  error ();
+}
+
+static void
+func2 (void *ptr)
+{
+  if (ptr != (void *)2)
+    error ();
+
+  if (step == 11)
+    {
+      step = 12;
+
+      grt_stack_switch (grt_stack_main_stack, stack2);
+
+      error ();
+    }
+
+  if (step != 1)
+    error ();
+
+  step = 2;
+
+  grt_stack_switch (grt_stack_main_stack, stack2);
+
+  if (step != 3)
+    error ();
+
+  step = 4;
+
+  grt_stack_switch (grt_stack_main_stack, stack2);
+
+  if (step != 8)
+    error ();
+
+  step = 9;
+
+  grt_stack_switch (stack1, stack2);
+}
+
+int
+main (void)
+{
+  grt_stack_init ();
+
+  stack1 = grt_stack_create (&func1, (void *)1);
+  stack2 = grt_stack_create (&func2, (void *)2);
+
+  step = 0;
+  grt_stack_switch (stack1, grt_stack_main_stack);
+
+  if (step != 1)
+    error ();
+
+  grt_stack_switch (stack2, grt_stack_main_stack);
+
+  if (step != 2)
+    error ();
+
+  step = 3;
+
+  grt_stack_switch (stack2, grt_stack_main_stack);
+
+  if (step != 4)
+    error ();
+
+  step = 5;
+
+  grt_stack_switch (stack1, grt_stack_main_stack);
+
+  if (step != 6)
+    error ();
+
+  step = 7;
+
+  grt_stack_switch (stack1, grt_stack_main_stack);
+
+  if (step != 10)
+    error ();
+
+  step = 11;
+
+  grt_stack_switch (stack2, grt_stack_main_stack);
+
+  if (step != 12)
+    error ();
+
+  printf ("Test successful\n");
+  return 0;
+}
diff --git a/src/grt/config/times.c b/src/grt/config/times.c
new file mode 100644
index 0000000..9c0b4eb
--- /dev/null
+++ b/src/grt/config/times.c
@@ -0,0 +1,55 @@
+/*  GRT C bindings for time.
+    Copyright (C) 2002 - 2014 Tristan Gingold.
+
+    GHDL is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2, or (at your option) any later
+    version.
+
+    GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+
+    As a special exception, if other files instantiate generics from this
+    unit, or you link this unit with other files to produce an executable,
+    this unit does not by itself cause the resulting executable to be
+    covered by the GNU General Public License. This exception does not
+    however invalidate any other reasons why the executable file might be
+    covered by the GNU Public License.
+*/
+#include <sys/times.h>
+#include <unistd.h>
+
+int
+grt_get_clk_tck (void)
+{
+  return sysconf (_SC_CLK_TCK);
+}
+
+void
+grt_get_times (int *wall, int *user, int *sys)
+{
+  clock_t res;
+  struct tms buf;
+
+  res = times (&buf);
+  if (res == (clock_t)-1)
+    {
+      *wall = 0;
+      *user = 0;
+      *sys = 0;
+    }
+  else
+    {
+      *wall = res;
+      *user = buf.tms_utime;
+      *sys = buf.tms_stime;
+    }
+}
+
diff --git a/src/grt/config/win32.c b/src/grt/config/win32.c
new file mode 100644
index 0000000..35322ba
--- /dev/null
+++ b/src/grt/config/win32.c
@@ -0,0 +1,265 @@
+/*  GRT stack implementation for Win32 using fibers.
+    Copyright (C) 2005 - 2014 Tristan Gingold.
+
+    GHDL is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2, or (at your option) any later
+    version.
+
+    GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+
+    As a special exception, if other files instantiate generics from this
+    unit, or you link this unit with other files to produce an executable,
+    this unit does not by itself cause the resulting executable to be
+    covered by the GNU General Public License. This exception does not
+    however invalidate any other reasons why the executable file might be
+    covered by the GNU Public License.
+*/
+
+#include <windows.h>
+#include <stdio.h>
+#include <setjmp.h>
+#include <assert.h>
+#include <excpt.h>
+
+static EXCEPTION_DISPOSITION
+ghdl_SEH_handler (struct _EXCEPTION_RECORD* ExceptionRecord,
+		  void *EstablisherFrame,
+		  struct _CONTEXT* ContextRecord,
+		  void *DispatcherContext);
+
+struct exception_registration
+{
+  struct exception_registration *prev;
+  void *handler;
+};
+
+struct stack_type
+{
+  LPVOID fiber; //  Win fiber.
+  void (*func)(void *);  // Function
+  void *arg; //  Function argument.
+};
+
+static struct stack_type main_stack_context;
+static struct stack_type *current;
+extern void grt_set_main_stack (struct stack_type *stack);
+
+void grt_stack_init(void)
+{
+  main_stack_context.fiber = ConvertThreadToFiber (NULL);
+  if (main_stack_context.fiber == NULL)
+    {
+      fprintf (stderr, "convertThreadToFiber failed (err=%lu)\n",
+	       GetLastError ());
+      abort ();
+    }
+  grt_set_main_stack (&main_stack_context);
+  current = &main_stack_context;
+}
+
+static VOID __stdcall
+grt_stack_loop (void *v_stack)
+{
+  struct stack_type *stack = (struct stack_type *)v_stack;
+  struct exception_registration er;
+  struct exception_registration *prev;
+
+  /* Get current handler.  */
+  asm ("mov %%fs:(0),%0" : "=r" (prev));
+
+  /* Build regisration.  */
+  er.prev = prev;
+  er.handler = ghdl_SEH_handler;
+
+  /* Register.  */
+  asm ("mov %0,%%fs:(0)" : : "r" (&er));
+
+  while (1)
+    {
+      (*stack->func)(stack->arg);
+    }
+}
+
+struct stack_type *
+grt_stack_create (void (*func)(void *), void *arg) 
+{
+  struct stack_type *res;
+
+  res = malloc (sizeof (struct stack_type));
+  if (res == NULL)
+    return NULL;
+  res->func = func;
+  res->arg = arg;
+  res->fiber = CreateFiber (0, &grt_stack_loop, res);
+  if (res->fiber == NULL)
+    {
+      free (res);
+      return NULL;
+    }
+  return res;
+}
+
+static int run_env_en;
+static jmp_buf run_env;
+static int need_longjmp;
+
+void
+grt_stack_switch (struct stack_type *to, struct stack_type *from)
+{
+  assert (current == from);
+  current = to;
+  SwitchToFiber (to->fiber);
+  if (from == &main_stack_context && need_longjmp)
+    {
+      /* We returned to do the longjump.  */
+      current = &main_stack_context;
+      longjmp (run_env, need_longjmp);
+    }
+}
+
+void
+grt_stack_delete (struct stack_type *stack)
+{
+  DeleteFiber (stack->fiber);
+  stack->fiber = NULL;
+}
+
+void
+__ghdl_maybe_return_via_longjump (int val)
+{
+  if (!run_env_en)
+    return;
+
+  if (current != &main_stack_context)
+    {
+      /* We are allowed to jump only in the same stack.
+	 First switch back to the main thread.  */
+      need_longjmp = val;
+      SwitchToFiber (main_stack_context.fiber);
+    }
+  else
+    longjmp (run_env, val);
+}
+
+extern void grt_stack_error_grow_failed (void);
+extern void grt_stack_error_null_access (void);
+extern void grt_stack_error_memory_access (void);
+extern void grt_overflow_error (void);
+
+static EXCEPTION_DISPOSITION
+ghdl_SEH_handler (struct _EXCEPTION_RECORD* ExceptionRecord,
+		  void *EstablisherFrame,
+		  struct _CONTEXT* ContextRecord,
+		  void *DispatcherContext)
+{
+  const char *msg = "";
+
+  switch (ExceptionRecord->ExceptionCode)
+    {
+    case EXCEPTION_ACCESS_VIOLATION:
+      if (ExceptionRecord->ExceptionInformation[1] == 0)
+	grt_stack_error_null_access ();
+      else
+	grt_stack_error_memory_access ();
+      break;
+          
+    case EXCEPTION_FLT_DENORMAL_OPERAND:
+    case EXCEPTION_FLT_DIVIDE_BY_ZERO:
+    case EXCEPTION_FLT_INVALID_OPERATION:
+    case EXCEPTION_FLT_OVERFLOW:
+    case EXCEPTION_FLT_STACK_CHECK:
+    case EXCEPTION_FLT_UNDERFLOW:
+      msg = "floating point error";
+      break;
+     
+    case EXCEPTION_INT_DIVIDE_BY_ZERO:
+      msg = "division by 0";
+      break;
+     
+    case EXCEPTION_INT_OVERFLOW:
+      grt_overflow_error ();
+      break;
+           
+    case EXCEPTION_STACK_OVERFLOW:
+      msg = "stack overflow";
+      break;
+     
+    default:
+      msg = "unknown reason";
+      break;
+    }
+
+  /* FIXME: is it correct?  */
+  fprintf (stderr, "exception raised: %s\n", msg);
+
+  __ghdl_maybe_return_via_longjump (1);
+  return 0; /* This is never reached, avoid compiler warning  */
+}
+
+int
+__ghdl_run_through_longjump (int (*func)(void))
+{
+  int res;
+  struct exception_registration er;
+  struct exception_registration *prev;
+
+  /* Get current handler.  */
+  asm ("mov %%fs:(0),%0" : "=r" (prev));
+
+  /* Build regisration.  */
+  er.prev = prev;
+  er.handler = ghdl_SEH_handler;
+
+  /* Register.  */
+  asm ("mov %0,%%fs:(0)" : : "r" (&er));
+
+  run_env_en = 1;
+  res = setjmp (run_env);
+  if (res == 0)
+    res = (*func)();
+  run_env_en = 0;
+
+  /* Restore.  */
+  asm ("mov %0,%%fs:(0)" : : "r" (prev));
+
+  return res;
+}
+
+#include <math.h>
+
+double acosh (double x)
+{
+  return log (x + sqrt (x*x - 1));
+}
+
+double asinh (double x)
+{
+  return log (x + sqrt (x*x + 1));
+}
+
+double atanh (double x)
+{
+  return log ((1 + x) / (1 - x)) / 2;
+}
+
+#ifndef WITH_GNAT_RUN_TIME
+void __gnat_raise_storage_error(void)
+{
+   abort ();
+}
+
+void __gnat_raise_program_error(void)
+{
+   abort ();
+}
+#endif
+
diff --git a/src/grt/config/win32thr.c b/src/grt/config/win32thr.c
new file mode 100644
index 0000000..bcebc49
--- /dev/null
+++ b/src/grt/config/win32thr.c
@@ -0,0 +1,167 @@
+/*  GRT stack implementation for Win32
+    Copyright (C) 2004, 2005 Felix Bertram.
+
+    GHDL is free software; you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2, or (at your option) any later
+    version.
+
+    GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+*/
+//-----------------------------------------------------------------------------
+// Project:     GHDL - VHDL Simulator
+// Description: Win32 port of stacks package
+// Note:        Tristan's original i386/Linux used assembly-code 
+//              to manually switch stacks for performance reasons.
+// History:     2004feb09, FB, created.
+//-----------------------------------------------------------------------------
+
+#include <windows.h>
+//#include <pthread.h>
+//#include <stdlib.h>
+//#include <stdio.h>
+
+
+//#define INFO printf
+#define INFO (void)
+
+// GHDL names an endless loop calling FUNC with ARG a 'stack'
+// at a given time, only one stack may be 'executed'
+typedef struct 
+{	HANDLE              thread;         // stack's thread
+	HANDLE              mutex;          // mutex to suspend/resume thread
+	void                (*Func)(void*); // stack's FUNC
+	void*               Arg;            // ARG passed to FUNC
+} Stack_Type_t, *Stack_Type;
+
+
+static Stack_Type_t      main_stack_context;
+extern void grt_set_main_stack (Stack_Type_t *stack);
+
+//------------------------------------------------------------------------------
+void grt_stack_init(void)
+// Initialize the stacks package.
+// This may adjust stack sizes.
+// Must be called after grt.options.decode.
+// => procedure Stack_Init;
+{	INFO("grt_stack_init\n");
+	INFO("  main_stack_context=0x%08x\n", &main_stack_context);
+
+	// create event. reset event, as we are currently running
+	main_stack_context.mutex = CreateEvent(NULL,  // lpsa
+	                                       FALSE, // fManualReset
+	                                       FALSE, // fInitialState
+	                                       NULL); // lpszEventName
+
+	grt_set_main_stack (&main_stack_context);
+}
+
+//------------------------------------------------------------------------------
+static unsigned long __stdcall grt_stack_loop(void* pv_myStack)
+{
+	Stack_Type myStack= (Stack_Type)pv_myStack;
+
+	INFO("grt_stack_loop\n");
+	
+	INFO("  myStack=0x%08x\n", myStack);
+
+	// block until event becomes set again.
+	// this happens when this stack is enabled for the first time
+	WaitForSingleObject(myStack->mutex, INFINITE);
+	
+	// run stack's function in endless loop
+	while(1)
+	{	INFO("  call 0x%08x with 0x%08x\n", myStack->Func, myStack->Arg);
+		myStack->Func(myStack->Arg);
+	}
+	
+	// we never get here...
+	return 0;
+}
+
+//------------------------------------------------------------------------------
+Stack_Type grt_stack_create(void* Func, void* Arg) 
+// Create a new stack, which on first execution will call FUNC with
+// an argument ARG.
+// => function Stack_Create (Func : Address; Arg : Address) return Stack_Type;
+{  	Stack_Type newStack;
+	DWORD      m_IDThread; // Thread's ID (dummy)
+
+	INFO("grt_stack_create\n");
+	INFO("  call 0x%08x with 0x%08x\n", Func, Arg);
+			
+	newStack= malloc(sizeof(Stack_Type_t));
+	
+	// init function and argument
+	newStack->Func= Func;
+	newStack->Arg=  Arg;
+	
+	// create event. reset event, so that thread will blocked in grt_stack_loop
+	newStack->mutex= CreateEvent(NULL,  // lpsa
+	                             FALSE, // fManualReset
+	                             FALSE, // fInitialState
+	                             NULL); // lpszEventName
+	
+	INFO("  newStack=0x%08x\n", newStack);
+	
+	// create thread, which executes grt_stack_loop
+	newStack->thread= CreateThread(NULL,           // lpsa
+	                               0,              // cbStack
+	                               grt_stack_loop, // lpStartAddr
+	                               newStack,       // lpvThreadParm
+	                               0,              // fdwCreate
+	                               &m_IDThread);   // lpIDThread
+	
+	return newStack;
+}
+
+//------------------------------------------------------------------------------
+void grt_stack_switch(Stack_Type To, Stack_Type From)
+// Resume stack TO and save the current context to the stack pointed by
+// CUR.
+// => procedure Stack_Switch (To : Stack_Type; From : Stack_Type);
+{	INFO("grt_stack_switch\n");
+	INFO("  from 0x%08x to 0x%08x\n", From, To);
+	
+	// set 'To' event. this will make the other thread either
+	// - start for first time in grt_stack_loop
+	// - resume at WaitForSingleObject below
+	SetEvent(To->mutex);
+		
+	// block until 'From' event becomes set again
+	// as we are running, our event is reset and we block here
+	// when stacks are switched, with above SetEvent, we may proceed
+	WaitForSingleObject(From->mutex, INFINITE);
+}
+
+//------------------------------------------------------------------------------
+void grt_stack_delete(Stack_Type Stack)
+// Delete stack STACK, which must not be currently executed.
+// => procedure Stack_Delete (Stack : Stack_Type);
+{	INFO("grt_stack_delete\n");
+}
+
+//----------------------------------------------------------------------------
+#ifndef WITH_GNAT_RUN_TIME
+void __gnat_raise_storage_error(void)
+{
+   abort ();
+}
+
+void __gnat_raise_program_error(void)
+{
+   abort ();
+}
+#endif
+
+//----------------------------------------------------------------------------
+// end of file
+