/*   Copyright (C) 2009 Clozure Associates */
/*   Copyright (C) 1994-2001 Digitool, Inc */
/*   This file is part of Clozure CL.  */

/*   Clozure CL is licensed under the terms of the Lisp Lesser GNU Public */
/*   License , known as the LLGPL and distributed with Clozure CL as the */
/*   file "LICENSE".  The LLGPL consists of a preamble and the LGPL, */
/*   which is distributed with Clozure CL as the file "LGPL".  Where these */
/*   conflict, the preamble takes precedence.   */

/*   Clozure CL is referenced in the preamble as the "LIBRARY." */

/*   The LLGPL is also available online at */
/*   http://opensource.franz.com/preamble.html */

/* The assembler has to do the arithmetic here:	 the expression */
/*   may not be evaluable by m4. */
define(`lwi',`ifdef(`DARWIN',`
	.if ((($2) & 0xffff8000) == 0xffff8000)
	 li $1,($2)
	.elseif ((($2) & 0xffff8000) == 0)
	 li $1,$2
	.else
	 lis $1,(($2)>>16)
	 .if (($2) & 0xffff) <> 0
	  ori $1,$1,(($2) & 0xffff)
	 .endif
	.endif',`
	.ifeq (($2) & 0xffff8000)-0xffff8000
	 li $1,$2
	.else
	 .ifeq (($2) & 0xffff8000)
	  li $1,$2
	 .else
	  lis $1,($2>>16)
	  .ifne ($2 & 0xffff)
	   ori $1,$1,$2 & 0xffff
	  .endif
	 .endif
	.endif
')')

ifdef(`PPC64',`
        define(`clrrri',`clrrdi $@')       
        define(`clrlri',`clrldi $@')
        define(`clrlri_',`clrldi. $@')
        define(`ldr',`ld $@')
        define(`ldrx',`ldx $@')
        define(`ldru',`ldu $@')
        define(`str',`std $@')
        define(`strx',`stdx $@')
        define(`stru',`stdu $@')
        define(`strux',`stdux $@')	
        define(`cmpr',`cmpd $@')
        define(`cmpri',`cmpdi $@')
        define(`cmplr',`cmpld $@')
        define(`cmplri',`cmpldi $@')
        define(`trlge',`tdlge $@')
        define(`trllt',`tdllt $@')
        define(`trlt',`tdlt $@')
	define(`trlle',`tdlle $@')
        define(`treqi',`tdeqi $@')
        define(`trnei',`tdnei $@')
        define(`trgti',`tdgti $@')
        define(`srari',`sradi $@')
        define(`srri',`srdi $@')
        define(`srr',`srd $@')
        define(`slri',`sldi $@')
        define(`lrarx',`ldarx $@')
        define(`strcx',`stdcx. $@')
        define(`load_highbit',`
        __(lis $1,0x8000)
        __(sldi $1,$1,32)
        ')
        define(`extract_bit_shift_count',`
        __(clrldi $1,$2,64-bitmap_shift)
        ')
        define(`alloc_trap',`
        __(tdlt allocptr,allocbase)
        ')
        define(`mullr',`mulld $@')
',`
        define(`clrrri',`clrrwi $@')
        define(`clrlri',`clrlwi $@')
        define(`clrlri_',`clrlwi. $@')
        define(`ldr',`lwz $@')
        define(`ldrx',`lwzx $@')
        define(`ldru',`lwzu $@')
        define(`str',`stw $@')
        define(`strx',`stwx $@')
        define(`stru',`stwu $@')
        define(`strux',`stwux $@')
        define(`cmpr',`cmpw $@')
        define(`cmpri',`cmpwi $@')
        define(`cmplr',`cmplw $@')
        define(`cmplri',`cmplwi $@')
        define(`trlge',`twlge $@')
        define(`trllt',`twllt $@')
        define(`trlt',`twlt $@')
        define(`trlle',`twlle $@')       
        define(`treqi',`tweqi $@')
        define(`trnei',`twnei $@')
        define(`trgti',`twgti $@')
        define(`srari',`srawi $@')
        define(`srri',`srwi $@')
        define(`srr',`srw $@')
        define(`slri',`slwi $@')
        define(`lrarx',`lwarx $@')
        define(`strcx',`stwcx. $@')
        define(`load_highbit',`
        __(lis $1,0x8000)
        ')
        define(`extract_bit_shift_count',`
        __(clrlwi $1,$2,32-bitmap_shift)
        ')
        define(`alloc_trap',`
        __(twllt allocptr,allocbase)
        ')
        define(`mullr',`mullw $@')
')

/* dnode_align(dest,src,delta) */
        define(`dnode_align',`
        __(la $1,($3+(dnode_size-1))($2))
        __(clrrri($1,$1,dnode_align_bits))
')

define(`extract_fulltag',`
	__(clrlri($1,$2,nbits_in_word-ntagbits))
        ')

define(`extract_lisptag',`
	__(clrlri($1,$2,nbits_in_word-nlisptagbits))
        ')

define(`extract_lisptag_',`
	__(clrlri_($1,$2,nbits_in_word-nlisptagbits))
        ')

define(`extract_subtag',`
	__(lbz $1,misc_subtag_offset($2))
	')

ifdef(`PPC64',`
define(`extract_lowtag',`
        __(clrldi $1,$2,nbits_in_word-nlowtagbits)
')
define(`trap_unless_lowtag_equal',`
        __(clrldi $3,$1,nbits_in_word-nlowtagbits)
        __(tdnei $3,$2)
')                
        ')
                               
define(`extract_lowbyte',`
        __(clrlri($1,$2,nbits_in_word-num_subtag_bits))
        ')

define(`extract_header',`
	__(ldr($1,misc_header_offset($2)))
	')


ifdef(`PPC64',`
define(`extract_typecode',`
	new_macro_labels()
	__(extract_fulltag($1,$2))
	__(cmpdi cr0,$1,fulltag_misc)
	__(extract_lisptag($1,$1))
	__(bne cr0,macro_label(not_misc))
	__(extract_subtag($1,$2))
macro_label(not_misc):
')',`	
define(`extract_typecode',`
	new_macro_labels()
	__(extract_lisptag($1,$2))
	__(cmpwi cr0,$1,tag_misc)
	__(bne cr0,macro_label(not_misc))
	__(extract_subtag($1,$2))
macro_label(not_misc):
')')

define(`box_fixnum',`
	__(slri($1,$2,fixnumshift))
	')

define(`unbox_fixnum',`	
	__(srari($1,$2,fixnumshift))
	')

define(`loaddf',`
	__(lfd $1,dfloat.value($2))')
	
define(`storedf',`
	__(stfd $1,dfloat.value($2))
	')

define(`push',`
	__(stru($1,-node_size($2)))
	')
	
	/* Generally not a great idea. */
define(`pop',`
	__(ldr($1,0($2)))
	__(la $2,node_size($2))
	')
	
define(`vpush',`
	__(push($1,vsp))
	')
	
define(`vpop',`
	__(pop($1,vsp))
	')
	
		
define(`unlink',`
	__(ldr($1,0($1)))
 ')

	
define(`set_nargs',`
	__(lwi(nargs,($1)<<fixnumshift))
	')
	
define(`bitclr',`
	__(rlwinm $1,$2,0,0x1f&((31-($3))+1),0x1f&((31-($3))-1))
	')
	

define(`vref32',`
	__(lwz $1,misc_data_offset+(($3)<<2)($2))
	')
        
define(`vref16',`/* dest,src,n*/
	__(lhz $1,misc_data_offset+(($3)<<1)($2))
	')
	
ifdef(`PPC64',`
        define(`vref64',`
        __(ld $1,misc_data_offset+(($3)<<3)($2))
	')

        define(`vrefr',`
        __(vref64($1,$2,$3))
	')
',`
        define(`vrefr',`
        __(vref32($1,$2,$3))
	')
')
        
                	
define(`getvheader',`
	__(ldr($1,vector.header($2)))
	')
	
	/* Size is unboxed element count */
define(`header_size',`
	__(srri($1,$2,num_subtag_bits))
	')
	
	/* "Length" is fixnum element count */
define(`header_length',`
ifdef(`PPC64',`
        __(rldicr $1,$2,nbits_in_word-(num_subtag_bits-nfixnumtagbits),63-nfixnumtagbits)
        __(clrldi $1,$1,(num_subtag_bits-nfixnumtagbits))
        ',`               
	__(rlwinm $1,$2,nbits_in_word-(num_subtag_bits-nfixnumtagbits),(num_subtag_bits-nfixnumtagbits),31-nfixnumtagbits)
        ')
')        


define(`vector_size',`
	__(getvheader(ifelse($3.`',$1,$3),$2))
	__(header_size($1,ifelse($3.`',$1,$3)))
	')
	
define(`vector_length',`
	__(getvheader($3,$2))
	__(header_length($1,$3))
	')

	
define(`ref_global',`
	__(ldr($1,lisp_globals.$2(0)))
')

define(`set_global',`
	__(str($1,lisp_globals.$2(0)))
')

define(`ref_nrs_value',`
	__(ldr($1,((nrs.$2)+(symbol.vcell))(0)))
')
	
define(`set_nrs_value',`
	__(str($1,((nrs.$2)+(symbol.vcell))(0)))
')

define(`extract_unsigned_byte_bits',`
ifdef(`PPC64',`
        __(rldicr $1,$2,64-fixnumshift,63-$3)
',`                
        __(rlwinm $1,$2,0,32-fixnumshift,31-($3+fixnumshift))
')        
')

define(`extract_unsigned_byte_bits_',`
ifdef(`PPC64',`
        __(rldicr. $1,$2,64-fixnumshift,63-$3)
',`                
        __(rlwinm. $1,$2,0,32-fixnumshift,31-($3+fixnumshift))
')        
')

	/* vpop argregs - nargs is known to be non-zero */
define(`vpop_argregs_nz',`
	new_macro_labels()
	__(cmplri(cr1,nargs,node_size*2))
	__(vpop(arg_z))
	__(blt cr1,macro_label(l0))
	__(vpop(arg_y))
	__(bne cr1,macro_label(l0))
	__(vpop(arg_x))
macro_label(l0):')

                
	/* vpush argregs */
define(`vpush_argregs',`
	new_macro_labels()
	__(cmplri(cr0,nargs,0))
	__(cmplri(cr1,nargs,node_size*2))
	__(beq cr0,macro_label(done))
	__(blt cr1,macro_label(z))
	__(beq cr1,macro_label(yz))
	__(vpush(arg_x))
macro_label(yz):
	__(vpush(arg_y))
macro_label(z):
	__(vpush(arg_z))
macro_label(done):
')

define(`create_lisp_frame',`
	__(stru(sp,-lisp_frame.size(sp)))
')

                
define(`build_lisp_frame',`
	create_lisp_frame()
	__(str(ifelse($1,`',fn,$1),lisp_frame.savefn(sp)))
	__(str(ifelse($2,`',loc_pc,$2),lisp_frame.savelr(sp)))
	__(str(ifelse($3,`',vsp,$3),lisp_frame.savevsp(sp)))
')

        	
define(`discard_lisp_frame',`
	__(la sp,lisp_frame.size(sp))
	')
	
	
define(`_car',`
	__(ldr($1,cons.car($2)))
')
	
define(`_cdr',`
	__(ldr($1,cons.cdr($2)))
	')
	
define(`_rplaca',`
	__(str($2,cons.car($1)))
	')
	
define(`_rplacd',`
	__(str($2,cons.cdr($1)))
	')

define(`vpush_saveregs',`
	__(vpush(save7))
	__(vpush(save6))
	__(vpush(save5))
	__(vpush(save4))
	__(vpush(save3))
	__(vpush(save2))
	__(vpush(save1))
	__(vpush(save0))
	')
	
define(`restore_saveregs',`
	__(ldr(save0,node_size*0($1)))
	__(ldr(save1,node_size*1($1)))
	__(ldr(save2,node_size*2($1)))
	__(ldr(save3,node_size*3($1)))
	__(ldr(save4,node_size*4($1)))
	__(ldr(save5,node_size*5($1)))
	__(ldr(save6,node_size*6($1)))
	__(ldr(save7,node_size*7($1)))
')

define(`vpop_saveregs',`
	__(restore_saveregs(vsp))
	__(la vsp,node_size*8(vsp))
')

define(`trap_unless_lisptag_equal',`
	__(extract_lisptag($3,$1))
	__(trnei($3,$2))
')

ifdef(`PPC64',`
define(`trap_unless_list',`
	new_macro_labels()
	__(cmpdi ifelse($3,$3,cr0),$1,nil_value)
	__(extract_fulltag($2,$1))
	__(beq ifelse($3,$3,cr0),macro_label(is_list))
	__(tdnei $2,fulltag_cons)
macro_label(is_list):	

')',`	
define(`trap_unless_list',`
	__(trap_unless_lisptag_equal($1,tag_list,$2))
')
')

define(`trap_unless_fulltag_equal',`
	__(extract_fulltag($3,$1))
	__(trnei($3,$2))
')
	
define(`trap_unless_typecode_equal',`
        __(extract_typecode($3,$1))
        __(trnei($3,$2))
')
        
/* "jump" to the code-vector of the function in nfn. */
define(`jump_nfn',`
	__(ldr(temp0,_function.codevector(nfn)))
	__(mtctr temp0)
	__(bctr)
')

/* "call the code-vector of the function in nfn. */
define(`call_nfn',`
	__(ldr(temp0,_function.codevector(nfn)))
	__(mtctr temp0)
	__(bctrl)
')
	

/* "jump" to the function in fnames function cell. */
define(`jump_fname',`
	__(ldr(nfn,symbol.fcell(fname)))
	__(jump_nfn())
')

/* call the function in fnames function cell. */
define(`call_fname',`
	__(ldr(nfn,symbol.fcell(fname)))
	__(call_nfn())
')

define(`do_funcall',`
	new_macro_labels()
	__(extract_fulltag(imm0,temp0))
	__(cmpri(imm0,fulltag_misc))
	__(mr nfn,temp0)
	__(bne- macro_label(bad))
	__(extract_subtag(imm0,temp0))
	__(cmpri(imm0,subtag_function))
	__(cmpri(cr1,imm0,subtag_symbol))
        __(bne cr0,macro_label(_sym))
        __(jump_nfn())
macro_label(_sym):             
	__(mr fname,temp0)
	__(bne cr1,macro_label(bad))
	__(jump_fname())
macro_label(bad):
	__(uuo_interr(error_cant_call,temp0))
')	

define(`mkcatch',`
	__(mflr loc_pc)
	__(ldr(imm0,tcr.catch_top(rcontext)))
	__(lwz imm1,0(loc_pc)) /* a forward branch to the catch/unwind cleanup */
	__(rlwinm imm1,imm1,0,6,29)	/* extract LI */
	__(add loc_pc,loc_pc,imm1)
	__(build_lisp_frame(fn,loc_pc,vsp))
	__(sub loc_pc,loc_pc,imm1)
	__(la loc_pc,4(loc_pc))	/* skip over the forward branch */
	__(mtlr loc_pc)
	__(lwi(imm4,(catch_frame.element_count<<num_subtag_bits)|subtag_catch_frame))
	__(ldr(imm3,tcr.xframe(rcontext)))
	__(ldr(imm1,tcr.db_link(rcontext)))
	__(TSP_Alloc_Fixed_Unboxed(catch_frame.size))
	__(la nargs,tsp_frame.data_offset+fulltag_misc(tsp))
        __(str(imm4,catch_frame.header(nargs)))
	__(str(arg_z,catch_frame.catch_tag(nargs)))
	__(str(imm0,catch_frame.link(nargs)))
	__(str(imm2,catch_frame.mvflag(nargs)))
	__(str(sp,catch_frame.csp(nargs)))
	__(str(imm1,catch_frame.db_link(nargs)))
        __(str(first_nvr,catch_frame.regs+0*node_size(nargs)))
        __(str(second_nvr,catch_frame.regs+1*node_size(nargs)))
        __(str(third_nvr,catch_frame.regs+2*node_size(nargs)))
        __(str(fourth_nvr,catch_frame.regs+3*node_size(nargs)))
        __(str(fifth_nvr,catch_frame.regs+4*node_size(nargs)))
        __(str(sixth_nvr,catch_frame.regs+5*node_size(nargs)))
        __(str(seventh_nvr,catch_frame.regs+6*node_size(nargs)))
        __(str(eighth_nvr,catch_frame.regs+7*node_size(nargs)))
	__(str(imm3,catch_frame.xframe(nargs)))
	__(str(rzero,catch_frame.tsp_segment(nargs)))
	__(Set_TSP_Frame_Boxed())
	__(str(nargs,tcr.catch_top(rcontext)))
        __(li nargs,0)

')	

define(`restore_catch_nvrs',`
        __(ldr(first_nvr,catch_frame.regs+(node_size*0)($1)))
        __(ldr(second_nvr,catch_frame.regs+(node_size*1)($1)))
        __(ldr(third_nvr,catch_frame.regs+(node_size*2)($1)))
        __(ldr(fourth_nvr,catch_frame.regs+(node_size*3)($1)))
        __(ldr(fifth_nvr,catch_frame.regs+(node_size*4)($1)))
        __(ldr(sixth_nvr,catch_frame.regs+(node_size*5)($1)))
        __(ldr(seventh_nvr,catch_frame.regs+(node_size*6)($1)))
        __(ldr(eighth_nvr,catch_frame.regs+(node_size*7)($1)))
')               

define(`DCBZL',`
	__(.long (31<<26)+(1<<21)+($1<<16)+($2<<11)+(1014<<1))
')
	
define(`check_stack_alignment',`
	new_macro_labels()
	__(andi. $1,sp,STACK_ALIGN_MASK)
	__(beq+ macro_label(stack_ok))
	__(.long 0)
macro_label(stack_ok):
')

define(`stack_align',`((($1)+STACK_ALIGN_MASK)&~STACK_ALIGN_MASK)')

define(`clear_alloc_tag',`
	__(clrrri(allocptr,allocptr,ntagbits))
')

/* If the GC interrupts the current thread (after the trap), it needs */
/*   to ensure that the cons cell that's been "reserved" stays reserved */
/*   (e.g. the tagged allocptr has to be treated as a node.)  If that */
/*   reserved cons cell gets tenured, the car and cdr are of a generation */
/*   that's at least as old (so memoization isn't an issue.) */

/*   More generally, if the GC interrupts a thread when allocptr is */
/*   tagged as a cons: */

/*    a) if the trap hasn't been taken (yet), the GC should force the */
/*       thread to resume in such a way that the trap will be taken ; */
/*       the segment allocator should worry about allocating the object. */

/*    b) If the trap has been taken, allocptr is treated as a node as */
/*       described above.  Allocbase is made to point to the base of the */
/*       cons cell, so that the thread's next allocation attempt will */
/*       invoke the segment allocator. */
	
define(`Cons',`
	__(la allocptr,(-cons.size+fulltag_cons)(allocptr))
        __(alloc_trap())
	__(str($3,cons.cdr(allocptr)))
	__(str($2,cons.car(allocptr)))
	__(mr $1,allocptr)
	__(clear_alloc_tag())
')


/* This is probably only used once or twice in the entire kernel, but */
/* I wanted a place to describe the constraints on the mechanism. */

/* Those constaints are (not surprisingly) similar to those which apply */
/* to cons cells, except for the fact that the header (and any length */
/* field that might describe large arrays) has to have been stored in */
/* the object if the trap has succeeded on entry to the GC.  It follows */
/* that storing the register containing the header must immediately */
/* follow the allocation trap (and an auxiliary length register must */
/* be stored immediately after the header.)  Successfully falling */
/* through the trap must emulate any header initialization: it would */
/* be a bad idea to have allocptr pointing to a zero header ... */



/* Parameters: */

/* $1 = dest reg */
/* $2 = header.  (For now, assume that this always encodes length ; */
/* that may change with "large vector" support.) */
/* $3 = register containing size in bytes.  (We're going to subtract */
/* fulltag_misc from this; do it in the macro body, rather than force the
/* (1 ?) caller to do it. */


define(`Misc_Alloc',`
	__(la $3,-fulltag_misc($3))
	__(sub allocptr,allocptr,$3)
        __(alloc_trap())
	__(str($2,misc_header_offset(allocptr)))
	__(mr $1,allocptr)
	__(clear_alloc_tag())
')

/*  Parameters $1, $2 as above; $3 = physical size constant. */
define(`Misc_Alloc_Fixed',`
	__(la allocptr,(-$3)+fulltag_misc(allocptr))
        __(alloc_trap())
	__(str($2,misc_header_offset(allocptr)))
	__(mr $1,allocptr)
	__(clear_alloc_tag())
')


/*  Zero $3 bytes worth of doublewords, starting at offset $2 relative */
/* to the base register $1. */


ifdef(`DARWIN',`
	.macro zero_doublewords
	.if $2
	stfd fp_zero,$1($0)
	zero_doublewords $0,$1+8,$2-8
	.endif
	.endmacro
')

ifdef(`LINUX',`
	.macro zero_doublewords base,disp,nbytes
	.if \nbytes
	stfd fp_zero,\disp(\base)
	zero_doublewords \base,\disp+8,\nbytes-8
	.endif
	.endm
')	

define(`Set_TSP_Frame_Unboxed',`
	__(str(tsp,tsp_frame.type(tsp)))
')

define(`Set_TSP_Frame_Boxed',`
	__(str(rzero,tsp_frame.type(tsp)))
')
		
/* A newly allocated TSP frame is always "raw" (has non-zero type, indicating */
/* that it doesn't contain tagged data. */

define(`TSP_Alloc_Fixed_Unboxed',`
	__(stru(tsp,-($1+tsp_frame.data_offset)(tsp)))
	__(Set_TSP_Frame_Unboxed())
')

define(`TSP_Alloc_Fixed_Unboxed_Zeroed',`
	__(TSP_Alloc_Fixed_Unboxed($1))
	__(zero_doublewords tsp,tsp_frame.fixed_overhead,$1)
')

define(`TSP_Alloc_Fixed_Boxed',`
	__(TSP_Alloc_Fixed_Unboxed_Zeroed($1))
	__(Set_TSP_Frame_Boxed())
')


        
	

/* This assumes that the backpointer points  to the first byte beyond */
/* each frame.  If we allow segmented tstacks, that constraint might */
/* complicate  their implementation. */
/* We don't need to know the size of the frame (positive or negative, */
/* with or without header).  $1 and $2 are temp registers, $3 is an */
/* optional CR field. */


/* Handle the general case, where the frame might be empty */
define(`Zero_TSP_Frame',`
	__(new_macro_labels())
	__(la $1,tsp_frame.size-8(tsp))
	__(ldr($2,tsp_frame.backlink(tsp)))
	__(la $2,-8($2))
	__(b macro_label(zero_tsp_test))
macro_label(zero_tsp_loop):
	__(stfdu fp_zero,8($1))
macro_label(zero_tsp_test):	
	__(cmpr(ifelse($3,`',`cr0',$3),$1,$2))
	__(bne ifelse($3,`',`cr0',$3),macro_label(zero_tsp_loop))
')

/* Save some branching when we know that the frame can't be empty.*/
define(`Zero_TSP_Frame_nz',`
	new_macro_labels()
	__(la $1,tsp_frame.size-8(tsp))
	__(ldr($2,tsp_frame.backlink(tsp)))
	__(la $2,-8($2))
macro_label(zero_tsp_loop):
	__(stfdu fp_zero,8($1))
	__(cmpr(ifelse($3,`',`cr0',$3),$1,$2))
	__(bne ifelse($3,`',`cr0',$3),macro_label(zero_tsp_loop))
')
	
/* $1 = 8-byte-aligned size, positive.  $2 (optiional) set */
/* to negated size. */
define(`TSP_Alloc_Var_Unboxed',`
	__(neg ifelse($2,`',$1,$2),$1)
	__(strux(tsp,tsp,ifelse($2,`',$1,$2)))
	__(Set_TSP_Frame_Unboxed())
')

define(`TSP_Alloc_Var_Boxed',`
	__(TSP_Alloc_Var_Unboxed($1))
	__(Zero_TSP_Frame($1,$2))
	__(Set_TSP_Frame_Boxed())
')		


define(`TSP_Alloc_Var_Boxed_nz',`
	__(TSP_Alloc_Var_Unboxed($1))
	__(Zero_TSP_Frame_nz($1,$2))
	__(Set_TSP_Frame_Boxed())
')		

define(`check_pending_interrupt',`
	new_macro_labels()
        __(ldr(nargs,tcr.tlb_pointer(rcontext)))
	__(ldr(nargs,INTERRUPT_LEVEL_BINDING_INDEX(nargs)))
	__(cmpri(ifelse($1,`',`cr0',$1),nargs,0))
	__(blt ifelse($1,`',`cr0',$1),macro_label(done))
	__(bgt ifelse($1,`',`cr0',$1),macro_label(trap))
	__(ldr(nargs,tcr.interrupt_pending(rcontext)))
macro_label(trap):
	__(trgti(nargs,0))
macro_label(done):
')

/* $1 = ndigits.  Assumes 4-byte digits */        
define(`aligned_bignum_size',`((~(dnode_size-1)&(node_size+(dnode_size-1)+(4*$1))))')

define(`suspend_now',`
	__(uuo_interr(error_propagate_suspend,rzero))
')