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Program Trace Routine Tracing can be terminated in batch or demand mode with the following methods: • Use the TOFF$ command (see 24.4.2). Program execution continues. • Use the EXIT$ command (see 24.4.2) 24.3. Symbol Tables When using SNOOPY, the u-field of the instruction is edited in octal if it does not refer to control storage. The calling program can provide a symbol table to SNOOPY using Fieldata characters instead of octal values when the u-field falls within the address range of the program being traced. To do this, store a value in the externally defined location SYMTB$. SNOOPY uses the symbol table while tracing a program. The value stored in SYMTB$ has the following form: 0 17 18 35 nbr-of-entries table-addr H1 H2 The symbol table at the specified address is an array of three-word entries in the form: 0 high +1 low 1 Fieldata symbol name or address of long name 2 bits symbol address H1 H2 If the rightmost bit of bits (bit 17) is set, SNOOPY assumes word 1 of the entry is the address of a 7- to 12-character Fieldata symbol instead of a 1- to 6-character Fieldata symbol. This accommodates long labels. The next word after the last entry may be another symbolic table descriptor word. This occurs if bit 1 is set in the last entry of the symbol table. SNOOPY searches the symbol table to which it points in the same fashion. This may be repeated to any level desired. However, circularity must be avoided (in other words, pointing to the address of a higher-level symbol table). If the u-field of an instruction is between the low- and high-address values, edit the u-field as the symbol given by the second word of the entry, plus or minus an offset calculated from the symbol address in the third word. If the nbr-of-entries parameter of SYMTB$ is zero as it is initially, all u-fields outside control storage are edited in octal except TOFF$ and a number of ER indexes. 24–4 7833 1733–004
24.4. Demand Mode Operation Program Trace Routine The caller has a great deal of control over the behavior of SNOOPY in demand mode. SNOOPY examines the program control table (PCT) to compute storage limits and the contingency routine address. When SNOOPY traces a demand program, the amount of output that SNOOPY produces is reduced (relative to batch mode) because of the low-speed output devices. In particular, header and trailer messages are brief, registers are dumped only on request, and line length may be restricted. Further control over printing may be obtained by using commands described in 24.4.2. For demand programs, SNOOPY operates in two modes. • Trace mode, in which instructions are traced • Command mode, in which the caller uses commands that direct SNOOPY's operation SNOOPY enters command mode under these circumstances. • On entrance, before tracing any instructions, unless mode bit 16 was set • When the Remote Break (RBK) contingency occurs (@@X C) • On completing the number of instructions specified by a SKIP or a numeric command • When encountering a condition specified by the BREAK or TRAP command • When an instruction is executed at an address specified on a CAPTUR command • At trace termination, unless mode bit 16 was set In command mode, the prompt is “C--”. SNOOPY solicits required parameter fields by indicating the nature of the required parameter. More than one command can be entered on any line solicited in command mode (including parameter lines). Delimiters separate the commands and parameters. A delimiter is any character not in the set (A through Z, 0 through 9, $, or -). Excess blanks are ignored. If any other consecutive delimiters are encountered, the effect is the same as the STEP command. That is, if answering “C--” with a line consisting of “////”, it has the same effect as four STEP commands. In certain cases, specific delimiters are required. To omit a parameter entirely, follow the delimiter that terminated the command by another (nonblank) delimiter (for example, “PRINT/”). Trace mode is suspended, the last instruction is printed, and a soliciting message appears under the above six circumstances. 7833 1733–004 24–5
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OS 2200 System Service Routines Lib
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OS 2200 System Service Routines Lib
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Contents 4.2.5. Error Status Codes
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Contents 14.1.4. Reusable Processor
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Contents Section 19. SAR$ ATREAD ..
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Contents Section 23. SIR$-Symbolic
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Contents Appendix J. Obsolete Entry
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Figures xiv 7833 1733-004
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Tables 20-1. SAR$: PLUS COM Buffer
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Introduction 1.2. Notation Conventi
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Introduction Numbers are represente
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Introduction If you install SYSLIB
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System Standard Procedures and Defi
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SYSLIB Access Methods All the SYSLI
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SYSLIB Access Methods This type of
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SYSLIB Access Methods 3-6 7833 1733
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AEDIT$-ASCII Image Composition Edit
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BSP$-Program File Basic Service Pac
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CABSAD$, CRELAD$-Addressing Routine
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CONWRD$-Condition Word Routine Para
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CONWRD$-Condition Word Routine 7-4
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EDIT$-Fieldata Image Composition Ed
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FDASC$-Fieldata/ASCII Data Conversi
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FDASC$-Fieldata/ASCII Data Conversi
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GETPSF$-Get a Scratch File Routine
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ID$-Identification Line Routine Exe
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ID$-Identification Line Routine Bit
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ID$-Identification Line Routine Err
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ID$-Identification Line Routine 11.
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ID$-Identification Line Routine Bit
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ID$-Identification Line Routine 11.
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ID$-Identification Line Routine err
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INFOR$-Internal Format Table Interf
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MFDSP$-Master File Directory Servic
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PREPRM, PREPRO, PREPF$, and POSTPR$
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ROR, ROR$-Relocatable Output Routin
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SAR$-Symbolic Access Routines 16.1.
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SAR$-Symbolic Access Routines FILE_
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SAR$-Symbolic Access Routines NEXT_
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SAR$-Symbolic Access Routines FIP$A
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SAR$-Symbolic Access Routines FIP$H
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SAR$-Symbolic Access Routines 16.2.
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SAR$-Symbolic Access Routines 16-14
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SAR$ READ 17.1.1.1. Required Inform
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SAR$ READ REQUEST_TYPE PLUS Attribu
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SAR$ READ READ_ADDRESS_WORD_OFFSET
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SAR$ READ CHARACTER_CODE PLUS Attri
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SAR$ READ CONTROL_RECORD_WORD_LENGT
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SAR$ READ The default buffer and ta
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SAR$ READ 17.1.3.2. SAR_READ Proced
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SAR$ READ 17.1.3.4. Example The fol
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SAR$ READ Table 17-3. SAR$: READ Pr
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SAR$ READ 17.2. READ Function/MASM
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SAR$ READ SR$REQTYPE The requested
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SAR$ READ SR$CALLST The status code
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SAR$ READ SR$SDFICW The image contr
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SAR$ READ 17.2.3.1. Open-Input Proc
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SAR$ READ 17.2.3.3. Close-Input Pro
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SAR$ READ Table 17-6. SAR$: READ Pr
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SAR$ READ 17.3.3. ASCII/ISO with Em
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SAR$ WRITE The calling program must
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SAR$ WRITE 18.1.1.2. Optional Infor
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SAR$ WRITE OUTPUT_IMAGE_CHARACTER_T
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SAR$ WRITE LINE_NUMBER_INTEGER_PART
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SAR$ WRITE IMAGE_BYTE_LENGTH PLUS A
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SAR$ WRITE The default buffer and t
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SAR$ WRITE 18.1.3.2. SAR_WRITE Proc
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SAR$ WRITE S'Print_heading' Insert
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SAR$ WRITE 18.1.3.5. Example The fo
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SAR$ WRITE Table 18-3. SAR$: WRITE
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SAR$ WRITE Empty symbiont output fi
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SAR$ WRITE SW$OUTRECT The type of r
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SAR$ WRITE SW$ELTCDT For SDF elemen
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SAR$ WRITE 18.2.1.4. WRITE Packet D
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SAR$ WRITE • Optional parameters
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SAR$ WRITE Initial Condition The ca
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SAR$ WRITE Table 18-6. SAR$: WRITE
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SAR$ ATREAD 19.1.1.1. Required Info
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SAR$ ATREAD Other character set typ
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SAR$ ATREAD OUTPUT_IMAGE_BYTE_LENGT
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SAR$ ATREAD 19.1.3. ATREAD Procedur
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SAR$ ATREAD • Attributes The addr
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SAR$ ATREAD Table 19-3. SAR$: ATREA
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SAR$ ATREAD SA$OTEXTB The address o
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SAR$ ATREAD 19.2.1.3. Information R
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SAR$ ATREAD 19.2.1.5. ATREAD Packet
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SAR$ ATREAD • Optional parameters
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SAR$ ATREAD S$ARATREAD does not spa
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SAR$ ATREAD Table 19-6. SAR$: ATREA
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SAR$ COM OUTPUT_TEXT_BUFFER_ADDRESS
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SAR$ COM INPUT_SELECT_LIST_ADDRESS
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SAR$ COM 20.1.1.3. Information Retu
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SAR$ COM 20.1.3. SAR$ COM Procedure
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SAR$ COM Table 20-3. SAR$: COM Proc
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SAR$ COM 20.2.1.2. Optional Informa
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SAR$ COM SC$RUNIDW1 The first four
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SAR$ COM Example $ASCII $INCLUDE
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SAR$ COM • Optional parameters (d
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SAR$ COM Table 20-5. SAR$: COM Proc
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SDFI, SDFO-System Data Format I/O R
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SDFI, SDFO-System Data Format I/O R
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Interface to Selected Extended Mode
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INFOR Information A field in the pr
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INFOR Information Word 0 Bits 0-9 T
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INFOR Information Bits 18-23 File C
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INFOR Information G.4. INFOR Table
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INFOR Information G-10 7833 1733-00
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ASCII-like Character Sets Table H-1
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ASCII-like Character Sets H-4 7833
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Extended Mode Interface to SYSLIB I
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Extended Mode Interface to SYSLIB T
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Extended Mode Interface to SYSLIB b
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Extended Mode Interface to SYSLIB P
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Obsolete Entry Points, PROCs, and R
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Related Product Information OS 1100
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Glossary Exec The kernel of the OS
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Glossary Problem list entry (PLE) A
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Index Fieldata characters, 8-1 floa
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Index read call, 21-8 SDFO close ca
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