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- .th CORE V 2/11/75
- .sh NAME
- core \*- format of core image file
- .sh DESCRIPTION
- UNIX
- writes out a core image of a terminated
- process when any of various errors occur.
- See
- .it "signal (II)"
- for the list of reasons;
- the most common are memory violations, illegal
- instructions, bus errors, and user-generated
- quit signals.
- The core image is called ``core'' and is written in the process's
- working directory (provided it can be; normal
- access controls apply).
- .s3
- The first 1024 bytes of the core image
- are a copy of the system's per-user
- data for the process, including the registers
- as they were at the time of the fault.
- The
- remainder represents the actual contents of
- the user's core area when the core image
- was written.
- If the text segment
- is write-protected and shared,
- it is not dumped; otherwise the entire
- address space is dumped.
- .s3
- The format of the
- information in the first 1024 bytes
- is described by
- the
- .it user
- structure of the system.
- The important stuff not detailed therein is the locations of the registers.
- Here are their offsets.
- The parenthesized numbers for the floating registers are
- used if the floating-point hardware is in
- single precision mode,
- as indicated in the status register.
- .s3
- .lp +10 7
- fpsr 0004
- .lp +10 7
- fr0 0006 (0006)
- .lp +10 7
- fr1 0036 (0022)
- .lp +10 7
- fr2 0046 (0026)
- .lp +10 7
- fr3 0056 (0032)
- .lp +10 7
- fr4 0016 (0012)
- .lp +10 7
- fr5 0026 (0016)
- .lp +10 7
- r0 1772
- .lp +10 7
- r1 1766
- .lp +10 7
- r2 1750
- .lp +10 7
- r3 1752
- .lp +10 7
- r4 1754
- .lp +10 7
- r5 1756
- .lp +10 7
- sp 1764
- .lp +10 7
- pc 1774
- .lp +10 7
- ps 1776
- .s3
- .i0
- In general the debuggers
- .it "db (I)"
- and
- .it "cdb (I)"
- are sufficient to deal with core images.
- .sh "SEE ALSO"
- cdb (I), db (I), signal (II)
-