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arc: Add prologue analysis

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Add a prologue analysis that recognizes all instructions that may happen in
compiler-generated prologue, including various stores, core register moves,
subtraction and ENTER_S instruction that does a lot of prologue actions through
microcode.

Testcases cover various prologue scenarios, including instructions that are
spread across multiple 16-bit encodings (for example there are 7 encodings of
store instruction).

gdb/ChangeLog:

yyyy-mm-dd  Anton Kolesov  <anton.kolesov@synopsys.com>

	* arc-tdep.c (arc_frame_cache): Add support for prologue analysis.
	(arc_skip_prologue): Likewise.
	(arc_make_frame_cache): Likewise.
	(arc_pv_get_operand): New function.
	(arc_is_in_prologue): Likewise.
	(arc_analyze_prologue): Likewise.
	(arc_print_frame_cache): Likewise.
	(MAX_PROLOGUE_LENGTH): New constant.

gdb/doc/ChangeLog:

yyyy-mm-dd  Anton Kolesov  <anton.kolesov@synopsys.com>

	* gdb.texinfo (Synopsys ARC): Document "set debug arc 2".

gdb/testsuite/ChangeLog:

yyyy-mm-dd  Anton Kolesov  <anton.kolesov@synopsys.com>

	* gdb.arch/arc-analyze-prologue.S: New file.
	* gdb.arch/arc-analyze-prologue.exp: Likewise.
This commit is contained in:
Anton Kolesov
2017-02-10 14:12:09 +03:00
parent eea787570f
commit fe5f7374be
7 changed files with 1603 additions and 22 deletions
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4
gdb/doc/ChangeLog
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@@ -1,3 +1,7 @@
2017-03-28 Anton Kolesov <anton.kolesov@synopsys.com>
* gdb.texinfo (Synopsys ARC): Document "set debug arc 2".
2017-03-28 Anton Kolesov <anton.kolesov@synopsys.com>
* gdb.texinfo (Synopsys ARC): Add "maint print arc arc-instruction".

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gdb/doc/gdb.texinfo
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@@ -22098,8 +22098,7 @@ acceptable commands.
@item set debug arc
@kindex set debug arc
Control the level of ARC specific debug messages. Use 0 for no messages (the
default) and 1 for debug messages. At present higher values offer no further
messages.
default), 1 for debug messages, and 2 for even more debug messages.
@item show debug arc
@kindex show debug arc