Add NEWS file

This should be used for tracking user-visible changes.  I retroactively
filled in entries from 0.6 on (inclusive).

1 files changed, 92 insertions, 0 deletions

diff --git a/NEWS b/NEWS
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+-*-org-*-
+* Version 0.7
+** General Features
+*** Full support for tracing multi-threaded processes
+*** Support for tracing inter-library calls
+    -e and -x were extended to allow library selectors.  See the man
+    page for details.
+*** Better support for parameter passing ("fetch backend")
+    This version brings a more complete support for parameter passing,
+    including passing structures in registers, passing double on i386,
+    and other edge cases that were unsupported before.  Several
+    architectures now support fetch backend, see below.
+*** Fix detaching from a process
+    Earlier, a process that ltrace detached from would sometimes die
+    of SIGSEGV, SIGTRAP, or SIGILL.  These were caused by ltrace
+    detaching from the process just after that process hit a
+    breakpoint.  Program counter would thus be left pointing
+    mid-instruction, or signals would be left pending.
+*** Fix tracing across vfork
+*** Fix tracing across exec in a stripped binary
+*** Be aware of deny_ptrace SELinux boolean
+*** Limited support for tracing returns from tail call functions
+*** -e, -x and -l selectors now allow using globs and regular expressions
+*** Argument to -n is now checked for validity
+*** Test suite can now be run under valgrind
+    Use --enable-valgrind to turn this on.
+** Config Files
+*** New abstraction: parameter pack
+    Parameter packs make it much simpler to add specialized decoding
+    logic.  The only parameter pack currently implemented is "format",
+    which used to be a special type.  It should be relatively
+    straightforward to add more parameter packs for functions like
+    execl, strftime, and others.
+*** New expression: zero
+    When used in array length expressions, it means "this array ends
+    at the first element with zero value".  C strigs are essentially
+    array(char, zero)*.
+*** Lenses
+    Lenses are used to change a way that underlying type is rendered.
+**** octal
+     "octal", which used to be a separate type, is now lens, which can
+     be used as octal(short) or octal(long) to render any underlying
+     type in base 8.  (Plain "octal" is still valid and means
+     "octal(int)".)
+**** hex, hide, bool
+     Similarly, "hex" lens was introduced to format as base 16.
+     "hide" was introduced to conceal given argument.  "bool" lens was
+     added to format objects as booleans.
+**** enum
+     "enum" became lens as well.  The underlying type is selected by
+     square brackets: "enum[short](RED,GREEN,BLUE)".
+*** Pointers now allow spaces between *'s
+** Architecture-specific Changes
+*** [x86] ORIG_RAX/ORIG_EAX may not contain original syscall number
+    In cases where the system call shouldn't be restarted, these are
+    set to -1.  In that case assume that the return is from the
+    topmost syscall.  This gets rid of some "unexpected breakpoint"
+    messages on x86_64 and i386.
+*** [x86] New fetch backend implemented
+*** [ppc] Allow stepping over lwarx instruction
+*** [ppc] Support both BSS and secure PLTs for 32-bit processes
+*** [ppc] Fix races in tracing -e events in 64-bit processes
+    As a side effect, events requested via -e now only hit when a PLT
+    call is made, which is consistent with other architectures.
+*** [ppc] New fetch backend implemented
+*** [mips] Implement software singlestepping
+*** [mips] Add support for CPIC main programs
+*** [ia64] New fetch backend implemented
+*** [s390] New fetch backend implemented
+*** [m68k] New fetch backend implemented
+*** [arm] Tracing is not supported at all on ARM
+    ltrace might work on older kernels, but no attempt was made to
+    fully support it.  Newer kernels don't support PTRACE_SINGLESTEP,
+    which ltrace depends on.  Before singlestepping is implemented in
+    software, ARM is considered unsupported.
+
+* Version 0.6
+** General Features
+*** Use autotools for building
+*** New option -b: disables output of signals received by the tracee
+*** New option -w: print stack trace of events
+    Pass --with-libunwind to configure to enable the feature.  This
+    requires libunwind.
+*** Support tracing of symbols from libraries opened with dlopen
+    These symbols are selected by -x.
+** Architecture-specific Changes
+*** Various fixes for MIPS and PowerPC
+*** Support for ARM Thumb mode
+*** Implement fetching of 5th and further function arguments on s390
+*** Support fork/exec syscalls on 31-bit s390
+*** Support for float and double arguments on x86_64
+*** Fixes for return arguments (after '+') in nested calls on x86_64