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1 files changed, 246 insertions, 0 deletions

diff --git a/gcc/config/picochip/libgccExtras/divmodhi4.asm b/gcc/config/picochip/libgccExtras/divmodhi4.asm
new file mode 100644
index 000000000..9dad674c7
--- /dev/null
+++ b/gcc/config/picochip/libgccExtras/divmodhi4.asm
@@ -0,0 +1,246 @@
+// picoChip ASM file
+//
+//   Support for 16-bit signed division/modulus.
+//
+//   Copyright (C) 2003, 2004, 2005, 2008, 2009  Free Software Foundation, Inc.
+//   Contributed by Picochip 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 __divmodhi4
+__divmodhi4:
+_picoMark_FUNCTION_BEGIN=
+
+// picoChip Function Prologue : &__divmodhi4 = 4 bytes
+
+	// 16-bit signed division. Most of the special cases are dealt
+	// with by the 15-bit signed division library (e.g., division by
+	// zero, division by 1, and so on). This wrapper simply inverts	
+	// any negative inputs, calls the 15-bit library, and flips any
+	// results as necessary.  The
+	// only special cases to be handled here are where either the 
+	// divisor or the dividend are the maximum negative values.
+
+	// Encode r5 with a bit pattern which indicates whether the
+	// outputs of the division must be negated. The MSB will be set
+	// to the sign of the dividend (which controls the remainder's
+	// sign), while the LSB will store the XOR of the two signs,
+	// which indicates the quotient's sign. R5 is not modified by the
+	// 15-bit divmod routine.
+	sub.0 r1,16#8000#,r15 \ asr.1 r0,15,r4
+	beq divisorIsLargestNegative \ lsr.0 r1,15,r3
+=->	sub.0 r0,16#8000#,r15 \ xor.1 r3,r4,r5
+
+	// Handle least negative dividend with a special case. Note that the
+	// absolute value of the divisor is also computed here.
+	add.0 [asr r1,15],r1,r3	\ beq dividendIsLargestNegative
+=->	xor.0 [asr r1,15],r3,r1 \ stw lr,(fp)-1	
+	
+	// Compute the absolute value of the dividend, and call the main
+	// divide routine.
+	add.0 r4,r0,r2 \ jl (&__divmod15)  // fn_call &__divmod15
+=->	xor.0 r4,r2,r0
+
+handleNegatedResults:	
+	// Speculatively store the negation of the results.
+	sub.0 0,r0,r2 \ sub.1 0,r1,r3
+
+	// Does the quotient need negating? The LSB indicates this.
+	and.0 r5,1,r15 \ ldw (fp)-1,lr
+	copyne r2,r0
+		
+	asr.0 r5,15,r15 \ jr (lr)
+=->	copyne r3,r1
+	
+dividendIsLargestNegative:
+
+	// Divide the constant -32768. Use the Hacker's Delight
+	// algorithm (i.e., ((dividend / 2) / divisor) * 2) gives
+	// approximate answer). This code is a special case, so no
+	// great effort is made to make it fast, only to make it
+	// small.
+
+	lsr.0 r0,1,r0 \ jl (&__divmod15)  // fn_call &__divmod15
+=->	stw r1,(fp)-2
+
+	// Load the original divisor, and compute the new quotient and
+	// remainder.	
+	lsl.0 r0,1,r0 \ ldw (fp)-2,r3
+	lsl.0 r1,1,r1 // Fill stall slot
+
+	// The error in the quotient is 0 or 1. The error can be determined
+	// by comparing the remainder to the original divisor. If the
+	// remainder is bigger, then an error of 1 has been introduced,
+	// which must be fixed.
+	sub.0 r1,r3,r15
+	blo noCompensationForError
+=->	nop	
+	add.0 r0,1,r0 \ sub.1 r1,r3,r1
+noCompensationForError:
+	bra handleNegatedResults
+=->	nop
+
+divisorIsLargestNegative:	
+	// The flags indicate whether the dividend is also the maximum negative
+	copy.0 r0,r1 \ copy.1 0,r0
+	copyeq r0,r1 \ jr (lr)
+=->	copyeq 1,r0
+
+_picoMark_FUNCTION_END=
+// picoChip Function Epilogue : __divmodhi4
+	
+
+//============================================================================
+// 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 0x4	// <-- 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#68# 16#69# 16#34# 16#0# // Function name `_divmodhi4'
+.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