AIX Version 4.3 Differences Guide

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Figure 6. Interfacing 64-Bit Processes to a 32-Bit Kernel Each system call that is exported by the 32-bit kernel is represented in 64-bit mode by a 64-bit-mode library routine in libc64.a that is the call target of what would have been (in 32-bit mode) a system call. These library routines handle any necessary reformatting of data to communicate with the 32-bit system call routines in the kernel. In many cases, they build a remapping table that tells how the required portions of the 64-bit address space should be reflected in a 32-bit map for the kernel. On the kernel side, in 32-bit mode, a kernel extension routine is added for each of the system calls supported in 64-bit mode. These routines are invoked from the 64-bit library routines through AIX’s syscall interface. They accept the reformatted data from the library routines and perform any necessary remapping of addresses using data supplied by the library routines. The kernel can then properly see data structures, buffers, and so on in the user spaces that are referred to in the call. A typical system call involves several pieces of code located in various places in the system. The names of these various pieces are all derived from the original 38 AIX Version 4.3 Differences Guide
name of the 32-bit system call. If a particular 32-bit system call is named bletch(), then: • The name of the C language routine in libc64.a that intercepts 64-bit calls to bletch() is precisely that: bletch. Note that the kernel does not export a symbol named bletch to 64-bit-mode processes, so all 64-bit calls to that label reach the library routine. • The C language routine library, at the point where it needs to invoke the kernel extension routine for this system call, calls __bletch() (two leading underscores). This is an assembly-language glue routine reached through the branch-and-link instruction. The name of its actual entry point will be .__bletch (leading period). • The glue routine, still in the 64-bit library, loads an entry from the TOC and issues a system call instruction. The TOC entry is assembled as a pointer to bletch64 (no prefix, suffix 64). • The kernel extension routine is named bletch64(), and this is the name that the kernel extension exports as a syscall. The kernel extension routine will itself call bletch() the existing 32-bit kernel service. The reason for the two underscores is for conformance with ANSI C, which reserves names not starting with two underscores (or one underscore and a capital letter) for the user, except for existing non-conforming UNIX names that are grandfathered. All external symbols in libc64.a must begin with two underscores. 3.2.2.1 64-Bit to 32-Bit Data Reformatting The goal of the 64-bit interface is to make it appear to the kernel that the system service request came from a 32-bit program. To this end, the width of any data passed across the interface in either direction must be adjusted to match the expected size. Data reformatting is done by the 64-bit library routine that is the call target of 64-bit system calls. It receives 64-bit data from the caller, does any necessary reformatting to 32-bit data, and calls its corresponding kernel extension routine that passes the (now 32-bit) data on to the kernel's system call service routine. On completion of the system call, a return code is (generally) passed back. In addition, the kernel may have passed data back in user space. When the library routine regains control, it expands the return code from 32 bits to 64 and expands any returned data in user space. For scalar parameters, the library does the following before calling the kernel extension routine: • char, unsigned char - Passed without change. • short, unsigned short - Passed without change. • int, unsigned int, long, unsigned long - Tested to make sure that the value being passed will fit in the 32-bit version of int or unsigned int. A value that is too large generally results in setting errno to EINVAL and returning a return code of -1. Values that are not too large are passed as 32-bit integers. Note: Integers that are larger than 2 32 are valid in some cases. For example, the lseek() routine takes an off_t (that is a long) as the seek position, a value 64-Bit Enablement 39
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AIX Version 4.3 Differences Guide R
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Take Note! Before using this inform
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2.12.5 Boot Logical Volume Scaling
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Chapter 6. System Management and Ut
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7.1.8 Commands and Applications Ena
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Page 26 and 27: The RS/6000 Enterprise Server Model
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Page 32 and 33: Table 3 is a comparison of various
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Page 38 and 39: work as on previous releases of AIX
Page 40 and 41: For AIX systems using AIX Version 3
Page 42 and 43: destructive overlay can be caught w
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Page 54 and 55: where it can be directly manipulate
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Page 66 and 67: The addr struct is a library-side s
Page 68 and 69: It is also possible to have a situa
Page 70 and 71: A single remap struct fits into a s
Page 72 and 73: Depending on the execution environm
Page 74 and 75: 3.2.4.2 Parameter Passing Examples
Page 76 and 77: On AIX 4.3, the same algorithm is u
Page 78 and 79: All of the following services are e
Page 80 and 81: UNIX98 interface will add very litt
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Page 84 and 85: These ANSI types are defined throug
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Page 88 and 89: symbols exported with svc3264 are a
Page 90 and 91: In general, no command user interfa
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Page 102 and 103: 4.6.1 Opening Files for Direct I/O
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The LVM in AIX 4.3.2 supports both
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MAX LVs: 256 FREE PPs: 81 (324 mega
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extended to 511 logical volumes and
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Note Although the chlvcopy command
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Figure 11. Default SMIT Menu SMIT p
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• NIM Install Manager Figure 13 s
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interface. Web-Based System Manager
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configuration change tasks in which
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Find Close Exit Opens a search dial
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Tree Changes the presentation of ic
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6.2.5.11 Status Line The status lin
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Note: The Web-Based System Manager
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A multiple selection is enabled for
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Figure 23. Example of Container Win
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6.4.3 Registered Applications This
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6.5 Daylight Savings Time Before AI
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keep the data and index files synch
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At the end of the install a volume
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cloned alt_inst_rootvg. The default
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6.8.4 Alternate Disk Installation E
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hdisk0 00006091aef8b687 rootvg hdis
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Support in SMIT was updated to allo
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6.10 System Resource Controller Sub
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6.11 TTY Remote Reboot (4.3.2) AIX
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exhaustively consumed. When a NIM o
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In summary, Table 25 shows the diff
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6.14 Error Message Templates (4.3.2
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6.17 System Backup Usability Enhanc
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Figure 31. Memory Exerciser Options
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146 AIX Version 4.3 Differences Gui
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7.1.2.1 Text Representation of Addr
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Anycast • Site-local - Valid only
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Error messages are identified by ha
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the Encapsulating Security Payload
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loaded as well if the administrator
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Figure 33. Typical Output from the
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7.1.8.3 route route was modified to
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specified by name or by number usin
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Figure 39. New SMIT TCP/IP Configur
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7.1.11 IPv6 and IPSec-Related RFCs
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Benefits are only gained when a cli
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of the routing applications are por
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There are new no options added: •
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7.9.1 Reducing the Number of TCP Pa
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• New macros to allow for simple
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thread will have a chance to handle
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unit of bit rate introduces an IPG
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• Debugging purposes. These trace
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Creating the Local Cache File Syste
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Parameter threshblocks=n maxfiles=n
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The automount command is called at
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7.14.2.5 Indirect Maps An indirect
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Event Error Used by the server to i
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8.2.3.1 Window Management The circu
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8.2.11 X Keyboard Extension Prior t
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y telling it to load a new configur
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8.2.12 X Record Extension The purpo
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down to a single round trip. It is
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ackwards compatibility; however, it
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The following is a list of AIX XIM
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mechanism to permit an IM Server to
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• XGetOMValues() • XDisplayOfOM
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locale.ldx /usr/lib/X11/locale/iso8
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objects, so the default installatio
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the same area just like real-world
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• Snap-back scrolling, a feature
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• Secondary transfer, also referr
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• Since the check mark sign is pa
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8.3.4.14 Scrolled Window and Scroll
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• New XmComboBox XmNpositionMode
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This application uses both the X Wi
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8.5.4 New OpenGL Extensions (4.3.2)
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The browser must be a forms-capable
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Figure 50. Documentation Search Ser
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If you have not run Netscape previo
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Previously, the man command had to
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Single-Byte Character Set Support (
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abandoning its standards-based inte
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• __mblen_std() - For all other c
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Locale method Unicode locales ISO88
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Unicode Locale Chinese (Traditional
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10.5 Euro Symbol Support for AIX (4
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Any UTF-8 based locale installed on
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Encoding UTF-8 multi-byte: Byte S
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Keyword p_sign_posn n_sign_posn Des
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Table 54 summarizes the AIX keyboar
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10.5.4 Input Methods for the Euro S
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A selection menu can be closed by p
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Figure 55. UNIVERSAL Input Method:
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Table 56 summarizes the new iconv c
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Converter Type Fileset UCS-2_IBM-11
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• X11.loc.XX_XX.Dt.rte • X11.lo
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Figure 56. German UTF-8: Add Additi
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SMIT uses the chlang command to set
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os.loc.iso.de_DE bos.loc.iso.en_US
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• Thai Cultural Conventions (Unic
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In Japan, most of operating systems
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X11.base.rte This fileset ships the
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Documentation Search Service does n
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Figure 59. Searching Japanese Docum
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Figure 61. A Japanese Book 10.7.3.2
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Figure 63. Input Chinese Character
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Figure 65. A Chinese Book for Insta
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Client 3 capabilities. In this case
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Figure 67. Stand-Alone LDAP Directo
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provides encryption of data and tra
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Changes to schema definitions previ
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environments may vary significantly
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• AIX Version 4 Getting Started,
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• http://www.lexmark.com • http
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How Customers Can Get ITSO Redbooks
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LDIF LFT LID LP LPI LPP LPR/LPD LDA
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authentication 300 authentication h
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E ed command 141 EDTMPDIR 141 effec
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kernel changes. crash command 17 de
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-command security 166 RDB glue 299
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web based systems management 95 arc
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SG24-2014-01 Printed in the U.S.A.
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AIX Version 4.3 Differences Guide

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