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This patch adds new variant (nXS) of DSB memory barrier instruction available in Armv8.7-a. New nXS variant has different encoding in comparison with pre Armv8.7-a DSB memory barrier variant thus new instruction and new operand was added. DSB memory nXS barrier variant specifies the limitation on the barrier operation. Allowed values are: DSB SYnXS|#28 DSB ISHnXS|#24 DSB NSHnXS|#20 DSB OSHnXS|#16 Please note that till now, for barriers, barrier operation was encoded in 4-bit unsigned immediate CRm field (in the range 0 to 15). For DSB memory nXS barrier variant, barrier operation is a 5-bit unsigned assembly instruction immediate, encoded in instruction in two bits CRm<3:2>: CRm<3:2> #imm 00 16 01 20 10 24 11 28 This patch extends current AArch64 barrier instructions with above mapping. Notable patch changes include: + New DSB memory barrier variant encoding for Armv8.7-a. + New operand BARRIER_DSB_NXS for above instruction in order to distinguish between existing and new DSB instruction flavour. + New set of DSB nXS barrier options. + New instruction inserter and extractor map between instruction immediate 5-bit value and 2-bit CRm field of the instruction itself (see FLD_CRm_dsb_nxs). + Regeneration of aarch64-[asm|dis|opc]-2.c files. + Test cases to cover new instruction assembling and disassembling. For more details regarding DSB memory barrier instruction and its Armv8.7-a flavour please refer to Arm A64 Instruction set documentation for Armv8-A architecture profile, see document pages 132-133 of [0]. [0]: https://developer.arm.com/docs/ddi0596/i gas/ChangeLog: 2020-10-23 Przemyslaw Wirkus <przemyslaw.wirkus@arm.com> * NEWS: Docs update. * config/tc-aarch64.c (parse_operands): Add AARCH64_OPND_BARRIER_DSB_NXS handler. (md_begin): Add content of aarch64_barrier_dsb_nxs_options to aarch64_barrier_opt_hsh hash. * testsuite/gas/aarch64/system-4-invalid.d: New test. * testsuite/gas/aarch64/system-4-invalid.l: New test. * testsuite/gas/aarch64/system-4-invalid.s: New test. * testsuite/gas/aarch64/system-4.d: New test. * testsuite/gas/aarch64/system-4.s: New test. include/ChangeLog: 2020-10-23 Przemyslaw Wirkus <przemyslaw.wirkus@arm.com> * opcode/aarch64.h (enum aarch64_opnd): New operand AARCH64_OPND_BARRIER_DSB_NXS. (aarch64_barrier_dsb_nxs_options): Declare DSB nXS options. opcodes/ChangeLog: 2020-10-23 Przemyslaw Wirkus <przemyslaw.wirkus@arm.com> * aarch64-asm.c (aarch64_ins_barrier_dsb_nxs): New inserter. * aarch64-asm.h (AARCH64_DECL_OPD_INSERTER): New inserter ins_barrier_dsb_nx. * aarch64-dis.c (aarch64_ext_barrier_dsb_nxs): New extractor. * aarch64-dis.h (AARCH64_DECL_OPD_EXTRACTOR): New extractor ext_barrier_dsb_nx. * aarch64-opc.c (aarch64_print_operand): New options table aarch64_barrier_dsb_nxs_options. * aarch64-opc.h (enum aarch64_field_kind): New field name FLD_CRm_dsb_nxs. * aarch64-tbl.h (struct aarch64_opcode): Define DSB nXS barrier Armv8.7-a instruction. * aarch64-asm-2.c: Regenerated. * aarch64-dis-2.c: Regenerated. * aarch64-opc-2.c: Regenerated. |
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README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.