CVS commit: src/tests/kernel

["Kamil Rytarowski" <kamil%netbsd.org@localhost>]

Module Name:    src
Committed By:   kamil
Date:           Wed Nov 23 23:30:50 UTC 2016

Modified Files:
        src/tests/kernel: t_ptrace_wait.c

Log Message:
Add {,io_}read_i[1234] in t_ptrace_wait{,3,4,6,id,pid}

New tests are direct counterparts to the existing ones {,io_}read_d[1234].

PT_READ_D and PIOD_READ_D (from PT_IO) are traditionally used to transfer
data segment. New tests make use of PT_READ_I and PIOD_READ_I (from PT_IO)
in order to copy text segment from traced process.

    Traditionally, ptrace() has
    allowed for machines with distinct address spaces for
    instruction and data, which is why there are two requests:
    conceptually, PT_READ_I reads from the instruction space
    and PT_READ_D reads from the data space.  In the current
    NetBSD implementation, these two requests are completely
    identical.

    --- ptrace(2)

New tests follow the traditional convention and copy only instructions from
dummy functions.

There are no new tests copying data to .text regions from the traced
process, as this is violating mprotect restrictions. This limitation may be
addressed in future, as there are dedicated sysctl(7) handlers for
debuggers (currently mainly gdb(1)).

Tests verifying identical behavior of PT_READ_I and PT_READ_D are not
planned.

Sponsored by <The NetBSD Foundation>


To generate a diff of this commit:
cvs rdiff -u -r1.26 -r1.27 src/tests/kernel/t_ptrace_wait.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.