GNU/Linux man pages
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Unix |
Unix v6 |
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core(5) |
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core format of core image file UNIX writes out a core image of a terminated process when any of various errors occur. See 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). 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. The format of the information in the first 1024 bytes is described by the 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. fpsr 0004 fr0 0006 (0006) fr1 0036 (0022) fr2 0046 (0026) fr3 0056 (0032) fr4 0016 (0012) fr5 0026 (0016) r0 1772 r1 1766 r2 1750 r3 1752 r4 1754 r5 1756 sp 1764 pc 1774 ps 1776 In general the debuggers and are sufficient to deal with core images. cdb (I), db (I), signal (II)
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core(5) | |