author | Dominic Pinkman <dominic.pinkman@nokia.com> |
Tue, 20 Jul 2010 12:00:49 +0100 | |
changeset 13 | 48780e181b38 |
parent 8 | ae94777fff8f |
permissions | -rw-r--r-- |
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Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-A188606F-4A8E-5A85-A241-E15219960EFA" xml:lang="en"><title>Loader Overview</title><shortdesc>This topic describes the overview, purpose, key concepts |
48780e181b38
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and architecture of loader.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<ul> |
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<li id="GUID-AE825AB3-3799-5A7A-A74D-D6E457A6997E"><p> <xref href="GUID-A188606F-4A8E-5A85-A241-E15219960EFA.dita#GUID-A188606F-4A8E-5A85-A241-E15219960EFA/GUID-E36370EC-CD5E-54AE-AD62-2BA3B70F5379">Purpose</xref> </p> </li> |
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<li id="GUID-9D2C951C-6092-53BB-BFA9-4D33230721FA"><p> <xref href="GUID-A188606F-4A8E-5A85-A241-E15219960EFA.dita#GUID-A188606F-4A8E-5A85-A241-E15219960EFA/GUID-89A8CABD-6B31-5D10-87F6-922CCFB83186">Key concepts</xref> </p> </li> |
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<li id="GUID-B21577D8-3B8B-596F-A3B6-6AC2538F6F28"><p> <xref href="GUID-A188606F-4A8E-5A85-A241-E15219960EFA.dita#GUID-A188606F-4A8E-5A85-A241-E15219960EFA/GUID-64154337-D706-5DE1-9319-4FEA6181EFC4">Architectural relationships</xref> </p> </li> |
ae94777fff8f
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</ul> |
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<section id="GUID-E36370EC-CD5E-54AE-AD62-2BA3B70F5379"><title>Purpose</title> <p>The loader makes EXEs and DLLs ready to run. </p> <p>The build |
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tools compile the source code into an executable file. An executable |
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file is called a binary. The build tools arrange the compiled code |
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into EXEs and DLLs. The source code, header files and other information |
48780e181b38
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that defines an executable file is defined in an mmp file. The loader |
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applies relocation information to the code and data sections of EXEs |
48780e181b38
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and DLLs. The loader also loads DLLs that are referred to by other |
48780e181b38
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EXEs and DLLs. EXEs and DLLs can then run in the process into which |
48780e181b38
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they are loaded. </p> </section> |
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<section id="GUID-89A8CABD-6B31-5D10-87F6-922CCFB83186"><title>Key |
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concepts</title> <p><b>The loader server</b> </p> <p>The Symbian platform loader is a |
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server. The loader server has no public client interface. The client |
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interface is internal to Symbian platform. Requests to load an EXE |
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or a DLL are passed to the loader when you do the following: </p> <ul> |
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<li id="GUID-5DFBB7F5-2F30-50C7-9144-3D6D85C0ACA1"><p>start a new |
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process - a call to <xref href="GUID-9DD1EA2B-DC59-315C-8E9C-CE6D9461B695.dita#GUID-9DD1EA2B-DC59-315C-8E9C-CE6D9461B695/GUID-DD214BA3-907E-3C7F-93C6-924A9A115A02"><apiname>RProcess::Create()</apiname></xref> </p> </li> |
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<li id="GUID-B88FC041-7643-5CA0-9796-A51E64CAA1DF"><p>load a DLL - |
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a call to <xref href="GUID-25327159-83D6-3507-B187-09EA4BB3727F.dita#GUID-25327159-83D6-3507-B187-09EA4BB3727F/GUID-4F1B2717-D34F-32A4-B6E6-03D0533186A3"><apiname>RLibrary::Load()</apiname></xref> </p> </li> |
48780e181b38
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<li id="GUID-A7578989-6BDB-5CEA-B3C3-0B5A08E57166"><p>load a logical |
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device driver - a call to <xref href="GUID-C197C9A7-EA05-3F24-9854-542E984C612D.dita#GUID-C197C9A7-EA05-3F24-9854-542E984C612D/GUID-AE0D51B7-7ADC-3C9F-ACAA-8F6D9EA0AEFA"><apiname>User::LoadLogicalDevice()</apiname></xref>. A logical device driver is a type of DLL. </p> </li> |
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<li id="GUID-34DC54FE-FCEF-5F83-B205-9BA5B7140680"><p>load a physical |
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device driver - a call to <xref href="GUID-C197C9A7-EA05-3F24-9854-542E984C612D.dita#GUID-C197C9A7-EA05-3F24-9854-542E984C612D/GUID-A0F4BF4A-9C58-3E5E-88E1-6D98597DDA18"><apiname>User::LoadPhysicalDevice()</apiname></xref>. A physical device driver is a type of DLL. </p> </li> |
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<li id="GUID-51318E5E-4534-589B-B4BD-92D73F832A6F"><p>load a file |
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system - a call to <xref href="GUID-E263C747-946F-35AA-9F1D-41833BD350FC.dita#GUID-E263C747-946F-35AA-9F1D-41833BD350FC/GUID-51353BE2-9133-39F5-83F3-A5DB88D858CA"><apiname>RFs::AddFileSystem()</apiname></xref>. A file |
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system is a type of DLL. A call to <codeph>RFs::AddFileSystem()</codeph> requires DiskAdmin capability. See <xref href="GUID-99D8A4E8-BC4F-39FF-A3DF-832CF0411629.dita"><apiname>ECapabilityDiskAdmin</apiname></xref>. </p> </li> |
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<li id="GUID-8394C231-341B-5EA6-B9C2-01F75685813D"><p>load a file |
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server extension - call to <xref href="GUID-E263C747-946F-35AA-9F1D-41833BD350FC.dita#GUID-E263C747-946F-35AA-9F1D-41833BD350FC/GUID-D45FD363-EEF9-3F77-8FA1-49270D8E89A0"><apiname>RFs::AddExtension()</apiname></xref>. |
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A file server extension is a type of DLL. This function requires DiskAdmin |
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capability. See <xref href="GUID-99D8A4E8-BC4F-39FF-A3DF-832CF0411629.dita"><apiname>ECapabilityDiskAdmin</apiname></xref>. </p> </li> |
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<li id="GUID-F1889916-80EB-55B6-BEAF-F66164F3838C"><p>load a locale |
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- a call to <xref href="GUID-454ACAB5-1573-323C-820E-AF542B149D2A.dita#GUID-454ACAB5-1573-323C-820E-AF542B149D2A/GUID-9F04584E-DD0B-39CE-8666-88F67F3B83BF"><apiname>TExtendedLocale::LoadLocale()</apiname></xref>. </p> </li> |
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</ul> <p><b>Version numbers</b> </p> <p><b>The reason for version numbers</b> </p> <p>More than one version |
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of an EXE can exist on a device at the same time. More than one version |
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of a DLL can exist on a device at the same time. A device can store |
48780e181b38
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versions of an EXE or DLL that are not compatible with an older version |
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of that EXE or DLL. </p> <p>A version number is a set of two numbers. |
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The loader uses these numbers to identify copies of the executable |
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file. The two numbers are called the major version number and the |
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minor version number. The build tools encode the two numbers into |
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the header of the executable file. When a DLL is built, the version |
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numbers are encoded into the import library. </p> <p><b>The structure of version information</b> </p> <p>DLLs are the |
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most common users of versions. You assign new values to the version |
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numbers of a DLL when you change the published API of the DLL. Symbian |
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recommends the following procedure: </p> <ul> |
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<li id="GUID-A3D6B7C6-E48E-5374-8EFE-29EB129FEE04"><p>change the minor |
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version number if you make a change to a DLL that is backward compatible. |
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An example is a new function in the DLL. </p> </li> |
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<li id="GUID-F6813400-1E6A-58B9-8360-7FD364F2153A"><p>change the major |
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version number if you make a change to a DLL that breaks an interface. |
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An example is the removal of a function or a change to the signature |
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of a function. An interface break is disruptive and must be prevented. </p> </li> |
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</ul> <p>The major and minor version numbers are defined in the <filepath>.mmp</filepath> file that defines the source code, header files and |
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other options that apply to the executable file. </p> <p>If you do |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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72 |
not specify version numbers, the build tools apply the following default |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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73 |
values: </p> <ul> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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74 |
<li id="GUID-CBF4D098-3A83-53E6-9E54-0A9B487D6E22"><p>Major version |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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75 |
number : 10 </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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76 |
<li id="GUID-46E7516E-988B-5F92-9877-FEE17D3F26A7"><p>Minor version |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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77 |
number : 0 </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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78 |
</ul> <p>The major version number and the minor version number are |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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79 |
stored in the header of an EXE and DLL. The two numbers are stored |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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80 |
in a single 32 bit value. The high 16 bits hold the major version |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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81 |
number. The low 16 bits hold the minor version number. </p> <p>When |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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82 |
you build a DLL, the build tools encode the version numbers into the |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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83 |
filename of the import library (the <filepath>.lib</filepath> file). |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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84 |
The build tools also create an import library that does not have the |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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85 |
version numbers encoded as part of the filename.The following example |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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86 |
shows how the version numbers are encoded in the filename. The major |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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87 |
version number is (decimal) 11 and the minor version number is (decimal) |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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88 |
2. The version numbers in the filename are in hexadecimal. </p> <p> <filepath>abcdsrv{000B0002}.lib</filepath> </p> <p>Notes: </p> <ul> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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89 |
<li id="GUID-7DC90016-5A54-5939-84B1-DDB0B2D4D9F5"><p>The left bracket |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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90 |
and the right bracket are part of the name. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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91 |
<li id="GUID-BC291976-EB6D-59D2-8941-64F6ED3AC191"><p>The first four |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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92 |
digits after the open bracket are the hexadecimal representation of |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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|
93 |
the major version number. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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94 |
<li id="GUID-51590778-985F-5DCC-9191-E937B1058F51"><p>The second four |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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95 |
digits are the hexadecimal representation of the minor version number. </p> </li> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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96 |
</ul> <p>The build tools do not encode the version numbers in the |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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97 |
filename of the executable file. </p> <p><b>Loader search rules</b> </p> <p>EXEs and DLLs can exist on more |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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98 |
than one drive. There can be more than one version of an EXE and more |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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99 |
than one version of a DLL. The loader uses search rules to select |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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100 |
the EXE and DLL to load. </p> <p>See <xref href="GUID-D8837969-74D0-5E17-AD42-3F10DD1FD5BF.dita">Loader search rules</xref> </p> <p><b>Emulator</b> </p> <p>Version numbers are stored in import files |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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101 |
for DLLs that run on devices and the emulator. Version numbers change |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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102 |
how the loader functions on devices, but not in the emulator. You |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
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103 |
cannot encode the version numbers in the import library file name |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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104 |
on the emulator. </p> <p><b>Tools support</b> </p> <p>Use the build tools to apply version |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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105 |
numbers to EXEs and DLLs. You specify version numbers in the <filepath>.mmp</filepath> file that describes the EXE or DLL. </p> <p>See also <uicontrol>MMP file syntax</uicontrol> in <uicontrol>Symbian Tools Guide > Building |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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106 |
> Symbian Build System (SBSv1) > Build tools reference</uicontrol>.</p> </section> |
8
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
Dominic Pinkman <dominic.pinkman@nokia.com>
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107 |
<section id="GUID-64154337-D706-5DE1-9319-4FEA6181EFC4"><title>Architectural |
13
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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108 |
relationships</title> <p>The loader is a server that runs in a separate |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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109 |
thread in the file server process. The loader is built as part of |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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110 |
the file server. </p> <p>The loader server starts when the file server |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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111 |
starts. The file server starts after the kernel is loaded at system |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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112 |
start. </p> <p>The loader runs on the user side, but calls the kernel |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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113 |
for services that are not available to general applications. Examples |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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114 |
of services are process creation and code segment creation. A code |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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115 |
segment is an object that represents a piece of code loaded into RAM. |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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116 |
A code segment also represents a piece of code that runs directly |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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117 |
from ROM. The kernel services that the loader uses are protected. |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
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118 |
The file server process only is allowed to access these services. </p> <p>The following picture is an example of program flow. In this |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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119 |
example, a client calls <xref href="GUID-25327159-83D6-3507-B187-09EA4BB3727F.dita#GUID-25327159-83D6-3507-B187-09EA4BB3727F/GUID-4F1B2717-D34F-32A4-B6E6-03D0533186A3"><apiname>RLibrary::Load()</apiname></xref>, which |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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120 |
exists in <filepath>euser.dll</filepath>. Internal functions make |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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121 |
client-server calls to the loader server. The loader server code exists |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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122 |
in <filepath>efile.exe</filepath>. The loader server uses kernel services. </p> <fig id="GUID-5FCAE81A-19BC-5BE7-89D2-096A87735381"> |
48780e181b38
Week 28 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 1897 and Bug 1522.
Dominic Pinkman <dominic.pinkman@nokia.com>
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123 |
<image href="GUID-2735BDAF-295F-5F1E-8925-8F4212D95CD1_d0e269008_href.png" placement="inline"/> |
8
ae94777fff8f
Week 23 contribution of SDK documentation content. See release notes for details. Fixes bugs Bug 2714, Bug 462.
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124 |
</fig> </section> |
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51a74ef9ed63
Week 12 contribution of API Specs and fix SDK submission
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
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125 |
</conbody></concept> |