Architecture-ABI - Revision history

Mhatle: /* Processor Variants */

2010-11-04T19:42:41Z

Processor Variants

← Older revision		Revision as of 19:42, 4 November 2010
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	=== Processor Variants ===		=== Processor Variants ===

			The gnu-canonical architecture for arm is in the format:

			armv<version><capabilities>-os-linux-gnu-eabi

			The gnu-eabi indicates that it is the newer EABI ABI.

			The ARM core versions include:

			* armv4
			* armv5
			* armv6
			* armv7

			The ARM processor capabilities indicate:

			* el - little endian (optional)
			* eb - big endian
			* t - thumb/thumb2
			* j - java

			This would result in something similar to: armv7teb, for an ARM 7 core, with thumb capabilities, running in big endian mode.

			In addition processors may include specific optimizations that change which CPUs a compiled program will run on, these include:

			* VFP instructions
			* NEON
			* Thumb/Thumb-2 instructions

	== IA32 ==		== IA32 ==

Mhatle: /* ABI Summary */

2010-11-04T19:25:25Z

ABI Summary

← Older revision		Revision as of 19:25, 4 November 2010
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	\|'''Arch'''\|\|'''ABI'''\|\|'''Endian'''\|\|'''Compatibility'''		\|'''Arch'''\|\|'''ABI'''\|\|'''Endian'''\|\|'''Compatibility'''
	\|-		\|-
	\|ARM\|\|~~ARM~~ EABI\|\|Big Endian\|\|		\|ARM\|\|EABI\|\|Big Endian\|\|
	\|-		\|-
	\|ARM\|\|~~ARM~~ EABI\|\|Little Endian\|\|		\|ARM\|\|EABI\|\|Little Endian\|\|
	\|}		\|}

Mhatle: /* ABI */

2010-11-04T19:25:00Z

ABI

← Older revision		Revision as of 19:25, 4 November 2010
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	It has two variants, an emulated hardware floating point, and a soft floating point variant. The legacy ABI should no longer be used in embedded projects and has more or less disappeared. The legacy ABI is not compatible with the EABI.		It has two variants, an emulated hardware floating point, and a soft floating point variant. The legacy ABI should no longer be used in embedded projects and has more or less disappeared. The legacy ABI is not compatible with the EABI.

	It can ~~be detected by:~~		You can detect the ABI if the result of objdump -x contains [APCS-32]

	~~From: http://wiki.debian.org/ArmEabiPort~~

	objdump -x contains [APCS-32]

	The legacy abi can be enabled by using "-mabi=apcs-gnu"		The legacy abi can be enabled by using "-mabi=apcs-gnu"
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	----		----

	EABI - The new "Embedded" ABI by ARM ltd.		EABI - The new "Embedded" ABI by ARM ltd. This is otherwise known as "the ABI for the ARM Architecture".

	The new EABI specifies a single ABI that works in various hardware floating point and software floating point configurations as well as Thumb interworking. Overall structure packing is better, a more efficient syscall convention is provided.		The new EABI specifies a single ABI that works in various hardware floating point and software floating point configurations as well as Thumb interworking. Overall structure packing is better, a more efficient syscall convention is provided.

			You can detect the ABI if the result of objdump -x contains [Version4 EABI]

	=== Processor Variants ===		=== Processor Variants ===

Mhatle: /* Introduction */

2010-11-04T19:21:57Z

Introduction

← Older revision		Revision as of 19:21, 4 November 2010
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	Additional references, CPU optimization compatibility and suggested canonical architecture namings may be provided.		Additional references, CPU optimization compatibility and suggested canonical architecture namings may be provided.

			== ABI Summary ==

			The following is a list of ABIs that are in common usage. Some of the ABIs discussed in the following sections will not appear in this table if they are legacy.

			{\| border="1"
			\|'''Arch'''\|\|'''ABI'''\|\|'''Endian'''\|\|'''Compatibility'''
			\|-
			\|ARM\|\|ARM EABI\|\|Big Endian\|\|
			\|-
			\|ARM\|\|ARM EABI\|\|Little Endian\|\|
			\|}

	== ARM ==		== ARM ==

Mhatle: /* ARM */

2010-11-04T19:20:19Z

ARM

← Older revision		Revision as of 19:20, 4 November 2010
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	== ARM ==		== ARM ==

			=== ABI ===

	apcs-gnu a.k.a. OABI - The original ARM ABI.		apcs-gnu a.k.a. OABI - The original ARM ABI.
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	The new EABI specifies a single ABI that works in various hardware floating point and software floating point configurations as well as Thumb interworking. Overall structure packing is better, a more efficient syscall convention is provided.		The new EABI specifies a single ABI that works in various hardware floating point and software floating point configurations as well as Thumb interworking. Overall structure packing is better, a more efficient syscall convention is provided.

	~~----~~		=== Processor Variants ===

	~~ARM Processors are available in both Big Endian and Little Endian varieties. Each variety impacts the ABI and specifies the endian bit and byte order.~~

	~~The following table lists the current ARM ABIs in common usage:~~

	~~{\| border~~=~~"1"~~
	~~\|'''ABI'''\|\|'''Endian'''\|\|'''Compatibility'''~~
	\|-
	~~\|EABI\|\|Big Endian\|\|~~
	\|-
	~~\|EABI\|\|Little Endian\|\|~~
	\|}

	== IA32 ==		== IA32 ==

Mhatle: /* Architecture ABI */

2010-11-04T19:17:53Z

Architecture ABI

← Older revision		Revision as of 19:17, 4 November 2010
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	== ~~Architecture ABI~~ ==		== Introduction ==

	There are currently many official and unofficial ABI -- Application Binary Interfaces -- in use within embedded Linux projects. The following is an attempt to lightly document what the individual architecture ABI consist of, without going into too many details..		There are currently many official and unofficial ABI -- Application Binary Interfaces -- in use within embedded Linux projects. The following is an attempt to lightly document what the individual architecture ABI consist of, without going into too many details..

	Many of the following ABIs have grown organically based on specific processor designs and optimization levels. For the most part the processor optimizations are ignored in these descriptions, unless otherwise mentioned.		Many of the following ABIs have grown organically based on specific processor designs and optimization levels. For the most part the processor optimizations are ignored in these descriptions, unless otherwise mentioned.

			Additional references, CPU optimization compatibility and suggested canonical architecture namings may be provided.

	== ARM ==		== ARM ==

Mhatle: Created page with '== Architecture ABI == There are currently many official and unofficial ABI -- Application Binary Interfaces -- in use within embedded Linux projects. The following is an attem…'

2010-11-04T19:13:53Z

Created page with '== Architecture ABI == There are currently many official and unofficial ABI -- Application Binary Interfaces -- in use within embedded Linux projects. The following is an attem…'

New page

== Architecture ABI ==

There are currently many official and unofficial ABI -- Application Binary Interfaces -- in use within embedded Linux projects. The following is an attempt to lightly document what the individual architecture ABI consist of, without going into too many details..

Many of the following ABIs have grown organically based on specific processor designs and optimization levels. For the most part the processor optimizations are ignored in these descriptions, unless otherwise mentioned.

== ARM ==

apcs-gnu a.k.a. OABI - The original ARM ABI.

It has two variants, an emulated hardware floating point, and a soft floating point variant. The legacy ABI should no longer be used in embedded projects and has more or less disappeared. The legacy ABI is not compatible with the EABI.

It can be detected by:

From: http://wiki.debian.org/ArmEabiPort

objdump -x contains [APCS-32]

The legacy abi can be enabled by using "-mabi=apcs-gnu"

----

EABI - The new "Embedded" ABI by ARM ltd.

The new EABI specifies a single ABI that works in various hardware floating point and software floating point configurations as well as Thumb interworking. Overall structure packing is better, a more efficient syscall convention is provided.

----

ARM Processors are available in both Big Endian and Little Endian varieties. Each variety impacts the ABI and specifies the endian bit and byte order.

The following table lists the current ARM ABIs in common usage:

{| border="1"
|'''ABI'''||'''Endian'''||'''Compatibility'''
|-
|EABI||Big Endian||
|-
|EABI||Little Endian||
|}

== IA32 ==

== MIPS ==

== Power ==