Intel XENIX 286 Programmers Guide (86) - Tenox.tc

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<strong>XENIX</strong> Programming adb: Program Debugger Validating Addresses Whenever you use an address in a command, adb checks the address to make sure it is valid. adb uses the segment number, file position, and size values in each map entry to validate the addresses. If an address is correct, adb carries out the command; otherwise, it displays an error message. The first step adb takes when validating an address is to check the segment value to make sure it belongs to the appropriate map. Segments used with the ? command must appear in the text segments map; segments used with the I command must appear in the data segments map. If the value does not belong to the map, adb displays a bad segment error. The next step is to check the offset to see if it is in range. The offset must be within the range 0 < = offset < = segment-size If it is not in this range, adb displays a bad address error. If adb is currently accessing memory, the validating segment and offset are used to access a memory location and no other processing takes place. If adb is accessing files, it computes an effective file address as follows: effective-fi le-address = offset + fi le-position then uses this effective address to read from the corresponding file. Miscellaneous Features The following sections explain how to use a number of useful miscellaneous commands and features of adb. Combining Comma nds on a Single Line You can give more than one command on a line by separating the commands with a semicolon (;). The com mands are performed one at a time, starting at the left. Changes to the current address and format are carried to the next command. If an error occurs, the remaining commands are ignored. One typical combination is to place a ? command after an 1 command. For example, the commands ?I 'Th'; ?s search for and display a string that begins with the characters "Th". 6-25
adb: Program Debugger <strong>XENIX</strong> Programming Creati ng adb Scripts You can direct adb to read commands from a text file instead of the keyboard by redirecting adb's standard input file at invocation. To redirect the standard input, use the standard redirection symbol < and supply a file name. For example, to read commands from the file script, type adb sample
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Table of Contents CONTENTS Compiler
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Table of Contents CONTENTS Using Ot
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Table of Contents CONTENTS Assemble
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Table of Contents CONTENTS CHAPTER
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Table of Contents TABLES TABLE TITL
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Introduction XENIX Programming 10.
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lint: C Program Checker XENIX Progr
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make: Program Maintainer XENIX Prog
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make: Program Maintainer print: $(F
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SCCS: Source Code Control System XE
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XENIX Programming switch ( string c
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XENIX Programming csh: C Shell Star
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XENIX Programming csh: C Shell Spec
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CHAPTER 9 lex : LEXICAL ANA LYZER G
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XENIX Programming lex: Lexical Anal
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XENIX Programm ing lex: Lexical Ana
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XENIX Programming Specifying Source
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XENIX Programming The definitions s
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CHAPTER 10 yacc: COMPILER-COMPILER
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XENIX Programming yacc: Compiler-Co
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XENIX Programming %left %left %left
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XENIX Programming I* lexical analys
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m4: Macro Processor XENIX Programmi
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C Language Portability XENIX Progra
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APPENDIX B PROG RAMMING COMMANDS Th
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XENIX Programming ad b (continued)
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XENIX Programming Programming Comma
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XENIX Programm ing Programming Comm
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Intel Publications Copies of the fo
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INDEX Note: For a master index to t
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XENIX Programming lint, B-80 thru B
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XENIX Programming fscanf, A-12 get,
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XENIX Programming maketemp, 11-8, B
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XENIX Programming Segments, 2-19, 2
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XENIX Programming yacc.acts, B-123
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REQUE.ST FOR READER'S COMMENTS XENI
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