gas: add support for eBPF

This patch adds a port for the Linux kernel eBPF to the GNU assembler.
A testsuite and documentation updates are included.

gas/ChangeLog:

2019-05-23  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* configure.ac: Handle bpf-*-* targets.
	* configure.tgt (generic_target): Likewise.
	* configure: Regenerate.
	* Makefile.am (TARGET_CPU_CFILES): Add tc-bpf.c.
	(TARGET_CPU_HFILES): Add tc-bpf.h.
	* Makefile.in: Regenerated.
	* config/tc-bpf.c: New file.
	* config/tc-bpf.h: Likewise.
	* doc/Makefile.am (CPU_DOCS): Add c-bpf.texi.
	* doc/Makefile.in: Regenerated.
	* doc/all.texi: set BPF.
	* doc/as.texi: Add eBPF contents.
	* doc/c-bpf.texi: New file.
	* testsuite/gas/bpf/alu.d: New file.
	* testsuite/gas/bpf/mem-be.d: Likewise.
	* testsuite/gas/bpf/mem.s: Likewise.
	* testsuite/gas/bpf/mem.d: Likewise.
	* testsuite/gas/bpf/lddw-be.d: Likewise.
	* testsuite/gas/bpf/lddw.s: Likewise.
	* testsuite/gas/bpf/lddw.d: Likewise.
	* testsuite/gas/bpf/jump-be.d: Likewise.
	* testsuite/gas/bpf/jump.s: Likewise.
	* testsuite/gas/bpf/jump.d: Likewise.
	* testsuite/gas/bpf/exit-be.d: Likewise.
	* testsuite/gas/bpf/exit.s: Likewise.
	* testsuite/gas/bpf/exit.d: Likewise.
	* testsuite/gas/bpf/call-be.d: Likewise.
	* testsuite/gas/bpf/call.s: Likewise.
	* testsuite/gas/bpf/call.d: Likewise.
	* testsuite/gas/bpf/bpf.exp: Likewise.
	* testsuite/gas/bpf/atomic-be.d: Likewise.
	* testsuite/gas/bpf/atomic.s: Likewise.
	* testsuite/gas/bpf/atomic.d: Likewise.
	* testsuite/gas/bpf/alu-be.d: Likewise.
	* testsuite/gas/bpf/alu32-be.d: Likewise.
	* testsuite/gas/bpf/alu32.s: Likewise.
	* testsuite/gas/bpf/alu32.d: Likewise.
	* testsuite/gas/bpf/alu.s: Likewise.
	* testsuite/gas/all/gas.exp: Introduce a nop_type for eBPF.
	* testsuite/gas/all/org-1.s: Support nop_type 6.
	* testsuite/gas/all/org-1.l: Updated to reflect changes in
	org-1.s.

1 files changed, 51 insertions, 0 deletions

diff --git a/gas/config/tc-bpf.h b/gas/config/tc-bpf.h
new file mode 100644
index 0000000..310cbc0
--- /dev/null
+++ b/gas/config/tc-bpf.h
@@ -0,0 +1,51 @@
+/* tc-bpf.h -- Header file for tc-ebpf.c.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   Contributed by Oracle, Inc.
+
+   This file is part of GAS, the GNU Assembler.
+
+   GAS is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GAS is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GAS; see the file COPYING.  If not, write to the Free
+   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
+   02110-1301, USA.  */
+
+#define TC_BPF
+
+#define LISTING_HEADER "BPF GAS "
+
+/* The target BFD architecture.  */
+#define TARGET_ARCH bfd_arch_bpf
+#define TARGET_MACH 0 /* The default.  */
+
+#define TARGET_FORMAT                                                   \
+  (target_big_endian ? "elf64-bpfbe" : "elf64-bpfle")
+
+/* This is used to set the default value for `target_big_endian'.  */
+#ifndef TARGET_BYTES_BIG_ENDIAN
+#define TARGET_BYTES_BIG_ENDIAN 0
+#endif
+
+/* .-foo gets turned into PC relative relocs.  */
+#define DIFF_EXPR_OK    1
+#define GAS_CGEN_PCREL_R_TYPE(R_TYPE) gas_cgen_pcrel_r_type (R_TYPE)
+
+/* Call md_pcrel_from_section(), not md_pcrel_from().  */
+#define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section (FIXP, SEC)
+extern long md_pcrel_from_section (struct fix *, segT);
+
+/* We don't need to handle .word strangely.  */
+#define WORKING_DOT_WORD
+
+/* Values passed to md_apply_fix don't include the symbol value.  */
+#define MD_APPLY_SYM_VALUE(FIX) 0
+