libgcc/config/picochip/divmodsi4.S - chromiumos/third_party/gcc - Git at Google

 // picoChip ASM file
 //
 //   Support for 32-bit signed division/modulus.
 //
 //   Copyright (C) 2003-2014 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 __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 relevant 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
	// picoChip ASM file
	//
	// Support for 32-bit signed division/modulus.
	//
	// Copyright (C) 2003-2014 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 __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 relevant 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