--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/picochip/libgccExtras/divmodsi4.asm	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,233 @@
+// picoChip ASM file
+//
+//   Support for 32-bit signed division/modulus.
+//
+//   Copyright (C) 2003, 2004, 2005, 2008, 2009  Free Software Foundation, Inc.
+//   Contributed by picoChip Designs Ltd.
+//   Maintained by Daniel Towner (daniel.towner@picochip.com)
+//
+//   This file 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 3, or (at your option) any
+//   later version.
+//
+//   This file 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.
+//
+//   Under Section 7 of GPL version 3, you are granted additional
+//   permissions described in the GCC Runtime Library Exception, version
+//   3.1, as published by the Free Software Foundation.
+//   
+//   You should have received a copy of the GNU General Public License and
+//   a copy of the GCC Runtime Library Exception along with this program;
+//   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+//   <http://www.gnu.org/licenses/>.
+
+.section .text
+
+.align 8
+.global __divmodsi4
+__divmodsi4:
+_picoMark_FUNCTION_BEGIN=
+// picoChip Function Prologue : &__divmodsi4 = 8 bytes
+
+	// Note: optimising for size is preferred over optimising for speed.
+
+	// Note: the frame is setup throughout the following instructions,
+	// and is complete at the point the udivmodsi4 function is called. 	
+
+	// Note that R9 is encoded with a pattern which indicates
+	// whether the remainder and quotient should be negated on
+	// completion. The MSB is set to the sign of the dividend
+	// (i.e., the sign of the remainder), while the LSB encodes
+	// the XOR of the two input's signs (i.e., the sign of the
+	// quotient.
+	
+	// If dividend is negative, invert the dividend and flag.
+	ASR.0 r1,15,r4
+	BEQ dividendNotNegative
+=->	STL R[9:8],(FP)-2
+
+	// Dividend is negative - negate dividend.
+        SUB.0 0,R0,R0
+        SUBB.0 0,R1,R1
+
+dividendNotNegative:
+			
+	// If divisor is negative, invert the divisor.
+	AND.0 [lsr r3,15],1,r5
+	SUB.0 R3,0, r15
+	BGE divisorNotNegative
+=->	XOR.0 r4,r5,r9
+
+	// Divisor is negative - negate divisor.
+        SUB.0 0,R2,R2
+        SUBB.0 0,R3,R3
+
+divisorNotNegative:
+	
+        STL R[13:12],(FP)-1 \ JL (&__udivmodsi4)
+=->	SUB.0 FP,8,FP  // udivmodsi expects the frame to be valid still.
+	
+	// The LSB of R9 indicates whether the quotient should be negated.
+	AND.0 r9,1,r15
+	BEQ skipQuotientNegation
+=->	LDL (FP)1,R[13:12]	// Convenient point to restore link/fp
+	
+        SUB.0 0,R4,R4
+        SUBB.0 0,R5,R5	
+
+skipQuotientNegation:		
+
+	// The MSB of R9 indicates whether the remainder should be negated.
+	ASR.0 R9,15,r15
+	BEQ epilogue
+
+        SUB.0 0,R6,R6
+        SUBB.0 0,R7,R7
+
+epilogue:	
+
+	JR (R12)
+=->	LDL (FP)-2,R[9:8]
+
+_picoMark_FUNCTION_END=
+// picoChip Function Epilogue : __divmodsi4
+
+//============================================================================
+// All DWARF information between this marker, and the END OF DWARF
+// marker should be included in the source file. Search for
+// FUNCTION_STACK_SIZE_GOES_HERE and FUNCTION NAME GOES HERE, and
+// provide the relevent information. Add markers called
+// _picoMark_FUNCTION_BEGIN and _picoMark_FUNCTION_END around the
+// function in question.
+//============================================================================
+
+//============================================================================
+// Frame information. 
+//============================================================================
+
+.section .debug_frame
+_picoMark_DebugFrame=
+
+// Common CIE header.
+.unalignedInitLong _picoMark_CieEnd-_picoMark_CieBegin
+_picoMark_CieBegin=
+.unalignedInitLong 0xffffffff
+.initByte 0x1	// CIE Version
+.ascii 16#0#	// CIE Augmentation
+.uleb128 0x1	// CIE Code Alignment Factor
+.sleb128 2	// CIE Data Alignment Factor
+.initByte 0xc	// CIE RA Column
+.initByte 0xc	// DW_CFA_def_cfa
+.uleb128 0xd
+.uleb128 0x0
+.align 2
+_picoMark_CieEnd=
+
+// FDE 
+_picoMark_LSFDE0I900821033007563=
+.unalignedInitLong _picoMark_FdeEnd-_picoMark_FdeBegin
+_picoMark_FdeBegin=
+.unalignedInitLong _picoMark_DebugFrame	// FDE CIE offset
+.unalignedInitWord _picoMark_FUNCTION_BEGIN	// FDE initial location
+.unalignedInitWord _picoMark_FUNCTION_END-_picoMark_FUNCTION_BEGIN
+.initByte 0xe	// DW_CFA_def_cfa_offset
+.uleb128 0x8	// <-- FUNCTION_STACK_SIZE_GOES_HERE
+.initByte 0x4	// DW_CFA_advance_loc4
+.unalignedInitLong _picoMark_FUNCTION_END-_picoMark_FUNCTION_BEGIN
+.initByte 0xe	// DW_CFA_def_cfa_offset
+.uleb128 0x0
+.align 2
+_picoMark_FdeEnd=
+
+//============================================================================
+// Abbrevation information.
+//============================================================================
+
+.section .debug_abbrev
+_picoMark_ABBREVIATIONS=
+
+.section .debug_abbrev
+	.uleb128 0x1	// (abbrev code)
+	.uleb128 0x11	// (TAG: DW_TAG_compile_unit)
+	.initByte 0x1	// DW_children_yes
+	.uleb128 0x10	// (DW_AT_stmt_list)
+	.uleb128 0x6	// (DW_FORM_data4)
+	.uleb128 0x12	// (DW_AT_high_pc)
+	.uleb128 0x1	// (DW_FORM_addr)
+	.uleb128 0x11	// (DW_AT_low_pc)
+	.uleb128 0x1	// (DW_FORM_addr)
+	.uleb128 0x25	// (DW_AT_producer)
+	.uleb128 0x8	// (DW_FORM_string)
+	.uleb128 0x13	// (DW_AT_language)
+	.uleb128 0x5	// (DW_FORM_data2)
+	.uleb128 0x3	// (DW_AT_name)
+	.uleb128 0x8	// (DW_FORM_string)
+.initByte 0x0
+.initByte 0x0
+
+	.uleb128 0x2	;# (abbrev code)
+	.uleb128 0x2e	;# (TAG: DW_TAG_subprogram)
+.initByte 0x0	;# DW_children_no
+	.uleb128 0x3	;# (DW_AT_name)
+	.uleb128 0x8	;# (DW_FORM_string)
+	.uleb128 0x11	;# (DW_AT_low_pc)
+	.uleb128 0x1	;# (DW_FORM_addr)
+	.uleb128 0x12	;# (DW_AT_high_pc)
+	.uleb128 0x1	;# (DW_FORM_addr)
+.initByte 0x0
+.initByte 0x0
+
+.initByte 0x0
+
+//============================================================================
+// Line information. DwarfLib requires this to be present, but it can
+// be empty.
+//============================================================================
+
+.section .debug_line
+_picoMark_LINES=
+
+//============================================================================
+// Debug Information
+//============================================================================
+.section .debug_info
+
+//Fixed header.
+.unalignedInitLong _picoMark_DEBUG_INFO_END-_picoMark_DEBUG_INFO_BEGIN
+_picoMark_DEBUG_INFO_BEGIN=
+.unalignedInitWord 0x2
+.unalignedInitLong _picoMark_ABBREVIATIONS
+.initByte 0x2
+
+// Compile unit information.
+.uleb128 0x1	// (DIE 0xb) DW_TAG_compile_unit)
+.unalignedInitLong _picoMark_LINES
+.unalignedInitWord _picoMark_FUNCTION_END
+.unalignedInitWord _picoMark_FUNCTION_BEGIN
+// Producer is `picoChip'
+.ascii 16#70# 16#69# 16#63# 16#6f# 16#43# 16#68# 16#69# 16#70# 16#00#
+.unalignedInitWord 0xcafe // ASM language
+.ascii 16#0# // Name. DwarfLib expects this to be present.
+
+.uleb128 0x2	;# (DIE DW_TAG_subprogram)
+
+// FUNCTION NAME GOES HERE. Use `echo name | od -t x1' to get the hex. Each hex
+// digit is specified using the format 16#XX#
+.ascii 16#5f# 16#64# 16#69# 16#76# 16#6d# 16#6f# 16#64# 16#73# 16#69# 16#34# 16#0# // Function name `_divmodsi4'
+.unalignedInitWord _picoMark_FUNCTION_BEGIN	// DW_AT_low_pc
+.unalignedInitWord _picoMark_FUNCTION_END	// DW_AT_high_pc
+
+.initByte 0x0	// end of compile unit children.
+
+_picoMark_DEBUG_INFO_END=
+
+//============================================================================
+// END OF DWARF
+//============================================================================
+
+.section .endFile
+// End of picoChip ASM file