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gcc/boehm-gc/mach_dep.c
Bryce McKinlay 79f777fd1e Imported GC 6.1 Alpha 3. Finally. 
From-SVN: r49698
2002-02-12 04:37:57 +00:00

598 lines
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/*
* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
*
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
*
* Permission is hereby granted to use or copy this program
* for any purpose, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*/
/* Boehm, November 17, 1995 12:13 pm PST */
# include "private/gc_priv.h"
# include <stdio.h>
# include <setjmp.h>
# if defined(OS2) || defined(CX_UX)
# define _setjmp(b) setjmp(b)
# define _longjmp(b,v) longjmp(b,v)
# endif
# ifdef AMIGA
# ifndef __GNUC__
# include <dos.h>
# else
# include <machine/reg.h>
# endif
# endif
#if defined(__MWERKS__) && !defined(POWERPC)
asm static void PushMacRegisters()
{
sub.w #4,sp // reserve space for one parameter.
move.l a2,(sp)
jsr GC_push_one
move.l a3,(sp)
jsr GC_push_one
move.l a4,(sp)
jsr GC_push_one
# if !__option(a6frames)
// <pcb> perhaps a6 should be pushed if stack frames are not being used.
move.l a6,(sp)
jsr GC_push_one
# endif
// skip a5 (globals), a6 (frame pointer), and a7 (stack pointer)
move.l d2,(sp)
jsr GC_push_one
move.l d3,(sp)
jsr GC_push_one
move.l d4,(sp)
jsr GC_push_one
move.l d5,(sp)
jsr GC_push_one
move.l d6,(sp)
jsr GC_push_one
move.l d7,(sp)
jsr GC_push_one
add.w #4,sp // fix stack.
rts
}
#endif /* __MWERKS__ */
# if defined(SPARC) || defined(IA64)
/* Value returned from register flushing routine; either sp (SPARC) */
/* or ar.bsp (IA64) */
word GC_save_regs_ret_val;
# endif
/* Routine to mark from registers that are preserved by the C compiler. */
/* This must be ported to every new architecture. There is a generic */
/* version at the end, that is likely, but not guaranteed to work */
/* on your architecture. Run the test_setjmp program to see whether */
/* there is any chance it will work. */
#ifndef USE_GENERIC_PUSH_REGS
void GC_push_regs()
{
# ifdef RT
register long TMP_SP; /* must be bound to r11 */
# endif
# if defined(MIPS) && defined(LINUX)
/* I'm not sure whether this has actually been tested. */
# define call_push(x) asm("move $4," x ";"); asm("jal GC_push_one")
call_push("$2");
call_push("$3");
call_push("$16");
call_push("$17");
call_push("$18");
call_push("$19");
call_push("$20");
call_push("$21");
call_push("$22");
call_push("$23");
call_push("$30");
# undef call_push
# endif /* MIPS && LINUX */
# ifdef VAX
/* VAX - generic code below does not work under 4.2 */
/* r1 through r5 are caller save, and therefore */
/* on the stack or dead. */
asm("pushl r11"); asm("calls $1,_GC_push_one");
asm("pushl r10"); asm("calls $1,_GC_push_one");
asm("pushl r9"); asm("calls $1,_GC_push_one");
asm("pushl r8"); asm("calls $1,_GC_push_one");
asm("pushl r7"); asm("calls $1,_GC_push_one");
asm("pushl r6"); asm("calls $1,_GC_push_one");
# endif
# if defined(M68K) && (defined(SUNOS4) || defined(NEXT))
/* M68K SUNOS - could be replaced by generic code */
/* a0, a1 and d1 are caller save */
/* and therefore are on stack or dead. */
asm("subqw #0x4,sp"); /* allocate word on top of stack */
asm("movl a2,sp@"); asm("jbsr _GC_push_one");
asm("movl a3,sp@"); asm("jbsr _GC_push_one");
asm("movl a4,sp@"); asm("jbsr _GC_push_one");
asm("movl a5,sp@"); asm("jbsr _GC_push_one");
/* Skip frame pointer and stack pointer */
asm("movl d1,sp@"); asm("jbsr _GC_push_one");
asm("movl d2,sp@"); asm("jbsr _GC_push_one");
asm("movl d3,sp@"); asm("jbsr _GC_push_one");
asm("movl d4,sp@"); asm("jbsr _GC_push_one");
asm("movl d5,sp@"); asm("jbsr _GC_push_one");
asm("movl d6,sp@"); asm("jbsr _GC_push_one");
asm("movl d7,sp@"); asm("jbsr _GC_push_one");
asm("addqw #0x4,sp"); /* put stack back where it was */
# endif
# if defined(M68K) && defined(HP)
/* M68K HP - could be replaced by generic code */
/* a0, a1 and d1 are caller save. */
asm("subq.w &0x4,%sp"); /* allocate word on top of stack */
asm("mov.l %a2,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %a3,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %a4,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %a5,(%sp)"); asm("jsr _GC_push_one");
/* Skip frame pointer and stack pointer */
asm("mov.l %d1,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %d2,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %d3,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %d4,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %d5,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %d6,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %d7,(%sp)"); asm("jsr _GC_push_one");
asm("addq.w &0x4,%sp"); /* put stack back where it was */
# endif /* M68K HP */
# if defined(M68K) && defined(AMIGA)
/* AMIGA - could be replaced by generic code */
/* a0, a1, d0 and d1 are caller save */
# ifdef __GNUC__
asm("subq.w &0x4,%sp"); /* allocate word on top of stack */
asm("mov.l %a2,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %a3,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %a4,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %a5,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %a6,(%sp)"); asm("jsr _GC_push_one");
/* Skip frame pointer and stack pointer */
asm("mov.l %d2,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %d3,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %d4,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %d5,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %d6,(%sp)"); asm("jsr _GC_push_one");
asm("mov.l %d7,(%sp)"); asm("jsr _GC_push_one");
asm("addq.w &0x4,%sp"); /* put stack back where it was */
# else /* !__GNUC__ */
GC_push_one(getreg(REG_A2));
GC_push_one(getreg(REG_A3));
# ifndef __SASC
/* Can probably be changed to #if 0 -Kjetil M. (a4=globals)*/
GC_push_one(getreg(REG_A4));
# endif
GC_push_one(getreg(REG_A5));
GC_push_one(getreg(REG_A6));
/* Skip stack pointer */
GC_push_one(getreg(REG_D2));
GC_push_one(getreg(REG_D3));
GC_push_one(getreg(REG_D4));
GC_push_one(getreg(REG_D5));
GC_push_one(getreg(REG_D6));
GC_push_one(getreg(REG_D7));
# endif /* !__GNUC__ */
# endif /* AMIGA */
# if defined(M68K) && defined(MACOS)
# if defined(THINK_C)
# define PushMacReg(reg) \
move.l reg,(sp) \
jsr GC_push_one
asm {
sub.w #4,sp ; reserve space for one parameter.
PushMacReg(a2);
PushMacReg(a3);
PushMacReg(a4);
; skip a5 (globals), a6 (frame pointer), and a7 (stack pointer)
PushMacReg(d2);
PushMacReg(d3);
PushMacReg(d4);
PushMacReg(d5);
PushMacReg(d6);
PushMacReg(d7);
add.w #4,sp ; fix stack.
}
# undef PushMacReg
# endif /* THINK_C */
# if defined(__MWERKS__)
PushMacRegisters();
# endif /* __MWERKS__ */
# endif /* MACOS */
# if defined(I386) &&!defined(OS2) &&!defined(SVR4) \
&& (defined(__MINGW32__) || !defined(MSWIN32)) \
&& !defined(SCO) && !defined(SCO_ELF) \
&& !(defined(LINUX) && defined(__ELF__)) \
&& !(defined(FREEBSD) && defined(__ELF__)) \
&& !(defined(NETBSD) && defined(__ELF__)) \
&& !(defined(OPENBSD) && defined(__ELF__)) \
&& !(defined(BEOS) && defined(__ELF__)) \
&& !defined(DOS4GW) && !defined(HURD)
/* I386 code, generic code does not appear to work */
/* It does appear to work under OS2, and asms dont */
/* This is used for some 38g UNIX variants and for CYGWIN32 */
asm("pushl %eax"); asm("call _GC_push_one"); asm("addl $4,%esp");
asm("pushl %ecx"); asm("call _GC_push_one"); asm("addl $4,%esp");
asm("pushl %edx"); asm("call _GC_push_one"); asm("addl $4,%esp");
asm("pushl %ebp"); asm("call _GC_push_one"); asm("addl $4,%esp");
asm("pushl %esi"); asm("call _GC_push_one"); asm("addl $4,%esp");
asm("pushl %edi"); asm("call _GC_push_one"); asm("addl $4,%esp");
asm("pushl %ebx"); asm("call _GC_push_one"); asm("addl $4,%esp");
# endif
# if ( defined(I386) && defined(LINUX) && defined(__ELF__) ) \
|| ( defined(I386) && defined(FREEBSD) && defined(__ELF__) ) \
|| ( defined(I386) && defined(NETBSD) && defined(__ELF__) ) \
|| ( defined(I386) && defined(OPENBSD) && defined(__ELF__) ) \
|| ( defined(I386) && defined(HURD) && defined(__ELF__) )
/* This is modified for Linux with ELF (Note: _ELF_ only) */
/* This section handles FreeBSD with ELF. */
/* Eax is caller-save and dead here. Other caller-save */
/* registers could also be skipped. We assume there are no */
/* pointers in MMX registers, etc. */
/* We combine instructions in a single asm to prevent gcc from */
/* inserting code in the middle. */
asm("pushl %ecx; call GC_push_one; addl $4,%esp");
asm("pushl %edx; call GC_push_one; addl $4,%esp");
asm("pushl %ebp; call GC_push_one; addl $4,%esp");
asm("pushl %esi; call GC_push_one; addl $4,%esp");
asm("pushl %edi; call GC_push_one; addl $4,%esp");
asm("pushl %ebx; call GC_push_one; addl $4,%esp");
# endif
# if ( defined(I386) && defined(BEOS) && defined(__ELF__) )
/* As far as I can understand from */
/* http://www.beunited.org/articles/jbq/nasm.shtml, */
/* only ebp, esi, edi and ebx are not scratch. How MMX */
/* etc. registers should be treated, I have no idea. */
asm("pushl %ebp; call GC_push_one; addl $4,%esp");
asm("pushl %esi; call GC_push_one; addl $4,%esp");
asm("pushl %edi; call GC_push_one; addl $4,%esp");
asm("pushl %ebx; call GC_push_one; addl $4,%esp");
# endif
# if defined(I386) && defined(MSWIN32) && !defined(__MINGW32__) \
&& !defined(USE_GENERIC)
/* I386 code, Microsoft variant */
__asm push eax
__asm call GC_push_one
__asm add esp,4
__asm push ebx
__asm call GC_push_one
__asm add esp,4
__asm push ecx
__asm call GC_push_one
__asm add esp,4
__asm push edx
__asm call GC_push_one
__asm add esp,4
__asm push ebp
__asm call GC_push_one
__asm add esp,4
__asm push esi
__asm call GC_push_one
__asm add esp,4
__asm push edi
__asm call GC_push_one
__asm add esp,4
# endif
# if defined(I386) && (defined(SVR4) || defined(SCO) || defined(SCO_ELF))
/* I386 code, SVR4 variant, generic code does not appear to work */
asm("pushl %eax"); asm("call GC_push_one"); asm("addl $4,%esp");
asm("pushl %ebx"); asm("call GC_push_one"); asm("addl $4,%esp");
asm("pushl %ecx"); asm("call GC_push_one"); asm("addl $4,%esp");
asm("pushl %edx"); asm("call GC_push_one"); asm("addl $4,%esp");
asm("pushl %ebp"); asm("call GC_push_one"); asm("addl $4,%esp");
asm("pushl %esi"); asm("call GC_push_one"); asm("addl $4,%esp");
asm("pushl %edi"); asm("call GC_push_one"); asm("addl $4,%esp");
# endif
# ifdef NS32K
asm ("movd r3, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
asm ("movd r4, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
asm ("movd r5, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
asm ("movd r6, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
asm ("movd r7, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
# endif
# if defined(SPARC)
{
word GC_save_regs_in_stack();
GC_save_regs_ret_val = GC_save_regs_in_stack();
}
# endif
# ifdef RT
GC_push_one(TMP_SP); /* GC_push_one from r11 */
asm("cas r11, r6, r0"); GC_push_one(TMP_SP); /* r6 */
asm("cas r11, r7, r0"); GC_push_one(TMP_SP); /* through */
asm("cas r11, r8, r0"); GC_push_one(TMP_SP); /* r10 */
asm("cas r11, r9, r0"); GC_push_one(TMP_SP);
asm("cas r11, r10, r0"); GC_push_one(TMP_SP);
asm("cas r11, r12, r0"); GC_push_one(TMP_SP); /* r12 */
asm("cas r11, r13, r0"); GC_push_one(TMP_SP); /* through */
asm("cas r11, r14, r0"); GC_push_one(TMP_SP); /* r15 */
asm("cas r11, r15, r0"); GC_push_one(TMP_SP);
# endif
# if defined(M68K) && defined(SYSV)
/* Once again similar to SUN and HP, though setjmp appears to work.
--Parag
*/
# ifdef __GNUC__
asm("subqw #0x4,%sp"); /* allocate word on top of stack */
asm("movl %a2,%sp@"); asm("jbsr GC_push_one");
asm("movl %a3,%sp@"); asm("jbsr GC_push_one");
asm("movl %a4,%sp@"); asm("jbsr GC_push_one");
asm("movl %a5,%sp@"); asm("jbsr GC_push_one");
/* Skip frame pointer and stack pointer */
asm("movl %d1,%sp@"); asm("jbsr GC_push_one");
asm("movl %d2,%sp@"); asm("jbsr GC_push_one");
asm("movl %d3,%sp@"); asm("jbsr GC_push_one");
asm("movl %d4,%sp@"); asm("jbsr GC_push_one");
asm("movl %d5,%sp@"); asm("jbsr GC_push_one");
asm("movl %d6,%sp@"); asm("jbsr GC_push_one");
asm("movl %d7,%sp@"); asm("jbsr GC_push_one");
asm("addqw #0x4,%sp"); /* put stack back where it was */
# else /* !__GNUC__*/
asm("subq.w &0x4,%sp"); /* allocate word on top of stack */
asm("mov.l %a2,(%sp)"); asm("jsr GC_push_one");
asm("mov.l %a3,(%sp)"); asm("jsr GC_push_one");
asm("mov.l %a4,(%sp)"); asm("jsr GC_push_one");
asm("mov.l %a5,(%sp)"); asm("jsr GC_push_one");
/* Skip frame pointer and stack pointer */
asm("mov.l %d1,(%sp)"); asm("jsr GC_push_one");
asm("mov.l %d2,(%sp)"); asm("jsr GC_push_one");
asm("mov.l %d3,(%sp)"); asm("jsr GC_push_one");
asm("mov.l %d4,(%sp)"); asm("jsr GC_push_one");
asm("mov.l %d5,(%sp)"); asm("jsr GC_push_one");
asm("mov.l %d6,(%sp)"); asm("jsr GC_push_one");
asm("mov.l %d7,(%sp)"); asm("jsr GC_push_one");
asm("addq.w &0x4,%sp"); /* put stack back where it was */
# endif /* !__GNUC__ */
# endif /* M68K/SYSV */
# if defined(PJ)
{
register int * sp asm ("optop");
extern int *__libc_stack_end;
GC_push_all_stack (sp, __libc_stack_end);
}
# endif
/* other machines... */
# if !defined(M68K) && !defined(VAX) && !defined(RT)
# if !defined(SPARC) && !defined(I386) && !defined(NS32K)
# if !defined(POWERPC) && !defined(UTS4)
# if !defined(PJ) && !(defined(MIPS) && defined(LINUX))
--> bad news <--
# endif
# endif
# endif
# endif
}
#endif /* !USE_GENERIC_PUSH_REGS */
#if defined(USE_GENERIC_PUSH_REGS)
void GC_generic_push_regs(cold_gc_frame)
ptr_t cold_gc_frame;
{
{
# ifdef HAVE_BUILTIN_UNWIND_INIT
/* This was suggested by Richard Henderson as the way to */
/* force callee-save registers and register windows onto */
/* the stack. */
__builtin_unwind_init();
# else /* !HAVE_BUILTIN_UNWIND_INIT */
/* Generic code */
/* The idea is due to Parag Patel at HP. */
/* We're not sure whether he would like */
/* to be he acknowledged for it or not. */
jmp_buf regs;
register word * i = (word *) regs;
register ptr_t lim = (ptr_t)(regs) + (sizeof regs);
/* Setjmp doesn't always clear all of the buffer. */
/* That tends to preserve garbage. Clear it. */
for (; (char *)i < lim; i++) {
*i = 0;
}
# if defined(POWERPC) || defined(MSWIN32) || defined(MSWINCE) \
|| defined(UTS4) || defined(LINUX) || defined(EWS4800)
(void) setjmp(regs);
# else
(void) _setjmp(regs);
# endif
# endif /* !HAVE_BUILTIN_UNWIND_INIT */
# if (defined(SPARC) && !defined(HAVE_BUILTIN_UNWIND_INIT)) \
|| defined(IA64)
/* On a register window machine, we need to save register */
/* contents on the stack for this to work. The setjmp */
/* is probably not needed on SPARC, since pointers are */
/* only stored in windowed or scratch registers. It is */
/* needed on IA64, since some non-windowed registers are */
/* preserved. */
{
word GC_save_regs_in_stack();
GC_save_regs_ret_val = GC_save_regs_in_stack();
/* On IA64 gcc, could use __builtin_ia64_flushrs() and */
/* __builtin_ia64_flushrs(). The latter will be done */
/* implicitly by __builtin_unwind_init() for gcc3.0.1 */
/* and later. */
}
# endif
GC_push_current_stack(cold_gc_frame);
}
}
#endif /* USE_GENERIC_PUSH_REGS */
/* On register window machines, we need a way to force registers into */
/* the stack. Return sp. */
# ifdef SPARC
asm(" .seg \"text\"");
# ifdef SVR4
asm(" .globl GC_save_regs_in_stack");
asm("GC_save_regs_in_stack:");
asm(" .type GC_save_regs_in_stack,#function");
# else
asm(" .globl _GC_save_regs_in_stack");
asm("_GC_save_regs_in_stack:");
# endif
# if defined(__arch64__) || defined(__sparcv9)
asm(" save %sp,-128,%sp");
asm(" flushw");
asm(" ret");
asm(" restore %sp,2047+128,%o0");
# else
asm(" ta 0x3 ! ST_FLUSH_WINDOWS");
asm(" retl");
asm(" mov %sp,%o0");
# endif
# ifdef SVR4
asm(" .GC_save_regs_in_stack_end:");
asm(" .size GC_save_regs_in_stack,.GC_save_regs_in_stack_end-GC_save_regs_in_stack");
# endif
# ifdef LINT
word GC_save_regs_in_stack() { return(0 /* sp really */);}
# endif
# endif
/* On IA64, we also need to flush register windows. But they end */
/* up on the other side of the stack segment. */
/* Returns the backing store pointer for the register stack. */
/* We now implement this as a separate assembly file, since inline */
/* assembly code here doesn't work with either the Intel or HP */
/* compilers. */
# if 0
# ifdef LINUX
asm(" .text");
asm(" .psr abi64");
asm(" .psr lsb");
asm(" .lsb");
asm("");
asm(" .text");
asm(" .align 16");
asm(" .global GC_save_regs_in_stack");
asm(" .proc GC_save_regs_in_stack");
asm("GC_save_regs_in_stack:");
asm(" .body");
asm(" flushrs");
asm(" ;;");
asm(" mov r8=ar.bsp");
asm(" br.ret.sptk.few rp");
asm(" .endp GC_save_regs_in_stack");
# endif /* LINUX */
# if 0 /* Other alternatives that don't work on HP/UX */
word GC_save_regs_in_stack() {
# if USE_BUILTINS
__builtin_ia64_flushrs();
return __builtin_ia64_bsp();
# else
# ifdef HPUX
_asm(" flushrs");
_asm(" ;;");
_asm(" mov r8=ar.bsp");
_asm(" br.ret.sptk.few rp");
# else
asm(" flushrs");
asm(" ;;");
asm(" mov r8=ar.bsp");
asm(" br.ret.sptk.few rp");
# endif
# endif
}
# endif
# endif
/* GC_clear_stack_inner(arg, limit) clears stack area up to limit and */
/* returns arg. Stack clearing is crucial on SPARC, so we supply */
/* an assembly version that's more careful. Assumes limit is hotter */
/* than sp, and limit is 8 byte aligned. */
#if defined(ASM_CLEAR_CODE)
#ifndef SPARC
--> fix it
#endif
# ifdef SUNOS4
asm(".globl _GC_clear_stack_inner");
asm("_GC_clear_stack_inner:");
# else
asm(".globl GC_clear_stack_inner");
asm("GC_clear_stack_inner:");
asm(".type GC_save_regs_in_stack,#function");
# endif
#if defined(__arch64__) || defined(__sparcv9)
asm("mov %sp,%o2"); /* Save sp */
asm("add %sp,2047-8,%o3"); /* p = sp+bias-8 */
asm("add %o1,-2047-192,%sp"); /* Move sp out of the way, */
/* so that traps still work. */
/* Includes some extra words */
/* so we can be sloppy below. */
asm("loop:");
asm("stx %g0,[%o3]"); /* *(long *)p = 0 */
asm("cmp %o3,%o1");
asm("bgu,pt %xcc, loop"); /* if (p > limit) goto loop */
asm("add %o3,-8,%o3"); /* p -= 8 (delay slot) */
asm("retl");
asm("mov %o2,%sp"); /* Restore sp., delay slot */
#else
asm("mov %sp,%o2"); /* Save sp */
asm("add %sp,-8,%o3"); /* p = sp-8 */
asm("clr %g1"); /* [g0,g1] = 0 */
asm("add %o1,-0x60,%sp"); /* Move sp out of the way, */
/* so that traps still work. */
/* Includes some extra words */
/* so we can be sloppy below. */
asm("loop:");
asm("std %g0,[%o3]"); /* *(long long *)p = 0 */
asm("cmp %o3,%o1");
asm("bgu loop "); /* if (p > limit) goto loop */
asm("add %o3,-8,%o3"); /* p -= 8 (delay slot) */
asm("retl");
asm("mov %o2,%sp"); /* Restore sp., delay slot */
#endif /* old SPARC */
/* First argument = %o0 = return value */
# ifdef SVR4
asm(" .GC_clear_stack_inner_end:");
asm(" .size GC_clear_stack_inner,.GC_clear_stack_inner_end-GC_clear_stack_inner");
# endif
# ifdef LINT
/*ARGSUSED*/
ptr_t GC_clear_stack_inner(arg, limit)
ptr_t arg; word limit;
{ return(arg); }
# endif
#endif
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