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* [PATCH v2 00/14] x86: new .insn directive
@ 2023-03-10 10:17 Jan Beulich
  2023-03-10 10:19 ` [PATCH v2 01/14] x86: introduce " Jan Beulich
                   ` (14 more replies)
  0 siblings, 15 replies; 21+ messages in thread
From: Jan Beulich @ 2023-03-10 10:17 UTC (permalink / raw)
  To: Binutils; +Cc: H.J. Lu, Jiang, Haochen

Especially when instructions which are not known to gas yet also take
register or, yet worse, memory operands, encoding such in code actually
wanting to make use of them is often difficult. Typically people resort
to hard-coding the involved registers, thus being able to express
things via .byte. To overcome this limitation (to a sufficient degree
at least), introduce .insn. This allows users to specify operands in
their "normal" shape (possibly in slightly altered order). Peculiarities
require two small syntax extensions; see the implementation or
documentation for details.

In order to re-use sufficiently much of the functionality md_assemble()
already uses, some adjustments to existing code were necessary. The one
item to call out here is the partial re-write of build_modrm_byte()
(patch 7), which actually turned out to simplify things. Subsequently
possible further tidying is carried out right away (patches 8 and 9),
even if not strictly related to the .insn work.

I'm pretty sure there are still corner cases which aren't taken care of
correctly. It's also quite possible that I've overlooked further places
in pre-existing code which need tweaking for .insn. People taking a
close look and/or playing with the new functionality would be much
appreciated.

The last patch in the series continues to be RFC, as I'm uncertain
whether we actually want this kind of a testcase.

Main changes in v2 are testsuite adjustments for certain non-Linux
targets, resulting from me not properly having re-run wider tests with
the last few patches in the series in place.

01: introduce .insn directive
02: parse VEX and alike specifiers for .insn
03: parse special opcode modifiers for .insn
04: re-work build_modrm_byte()'s register assignment
05: VexVVVV is now merely a boolean
06: drop "shimm" special case template expansions
07: AT&T: restrict recognition of the "absolute branch" prefix character
08: process instruction operands for .insn
09: handle EVEX Disp8 for .insn
10: allow for multiple immediates in output_disp()
11: handle immediate operands for .insn
12: document .insn
13: convert testcases to use .insn
14: .insn example - VEX-encoded instructions of original Xeon Phi

Jan

^ permalink raw reply	[flat|nested] 21+ messages in thread

end of thread, other threads:[~2023-04-20  9:22 UTC | newest]

Thread overview: 21+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-03-10 10:17 [PATCH v2 00/14] x86: new .insn directive Jan Beulich
2023-03-10 10:19 ` [PATCH v2 01/14] x86: introduce " Jan Beulich
2023-03-10 10:19 ` [PATCH v2 02/14] x86: parse VEX and alike specifiers for .insn Jan Beulich
2023-03-10 10:20 ` [PATCH v2 03/14] x86: parse special opcode modifiers " Jan Beulich
2023-03-10 10:21 ` [PATCH v2 04/14] x86: re-work build_modrm_byte()'s register assignment Jan Beulich
2023-03-10 10:21 ` [PATCH v2 05/14] x86: VexVVVV is now merely a boolean Jan Beulich
2023-03-10 10:22 ` [PATCH v2 06/14] x86: drop "shimm" special case template expansions Jan Beulich
2023-03-10 10:22 ` [PATCH v2 07/14] x86/AT&T: restrict recognition of the "absolute branch" prefix character Jan Beulich
2023-03-10 10:23 ` [PATCH v2 08/14] x86: process instruction operands for .insn Jan Beulich
2023-03-10 10:24 ` [PATCH v2 09/14] x86: handle EVEX Disp8 " Jan Beulich
2023-03-10 10:24 ` [PATCH v2 10/14] x86: allow for multiple immediates in output_disp() Jan Beulich
2023-03-10 10:25 ` [PATCH v2 11/14] x86: handle immediate operands for .insn Jan Beulich
2023-03-10 10:26 ` [PATCH v2 12/14] x86: document .insn Jan Beulich
2023-03-10 10:26 ` [PATCH v2 13/14] x86: convert testcases to use .insn Jan Beulich
2023-04-20  8:56   ` Clément Chigot
2023-04-20  9:01     ` Jan Beulich
2023-04-20  9:09       ` Clément Chigot
2023-04-20  9:19         ` Jan Beulich
2023-04-20  9:22           ` Clément Chigot
2023-03-10 10:27 ` [PATCH RFC v2 14/14] x86: .insn example - VEX-encoded instructions of original Xeon Phi Jan Beulich
2023-03-24  9:51 ` [PATCH v2 00/14] x86: new .insn directive Jan Beulich

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