bpf: add xBPF ISA

This patch adds support for xBPF, another ISA targetting the BPF
virtual architecture. For now, the primary difference between eBPF
and xBPF is that xBPF supports indirect calls through the
'call %reg' form of the call instruction.

bfd/
	* archures.c (bfd_mach_xbpf): Define.
	* bfd-in2.h: Regenerate.
	* cpu-bpf.c (bfd_xbpf_arch) New.
	(bfd_bpf_arch) Update next in list field to point to xbpf arch.

cpu/
	* bpf.cpu (arch bpf): Add xbpf mach and isas.
	(define-xbpf-isa) New pmacro.
	(all-isas) Add xbpfle,xbpfbe.
	(endian-isas): New pmacro.
	(mach xbpf): New.
	(model xbpf-def): Likewise.
	(h-gpr): Add xbpf mach.
	(f-dstle, f-srcle, dstle, srcle): Add xbpfle isa.
	(f-dstbe, f-srcbe, dstbe, srcbe): Add xbpfbe isa.
	(define-alu-insn-un): Use new endian-isas pmacro.
	(define-alu-insn-bin, define-alu-insn-mov): Likewise.
	(define-endian-insn, define-lddw): Likewise.
	(dlind, dxli, dxsi, dsti): Likewise.
	(define-cond-jump-insn, define-call-insn): Likewise.
	(define-atomic-insns): Likewise.

gas/
	* config/tc-bpf.c: Add option -mxbpf to select xbpf isa.
	* testsuite/gas/bpf/indcall-1.d: New file.
	* testsuite/gas/bpf/indcall-1.s: Likewise.
	* testsuite/gas/bpf/indcall-bad-1.l: Likewise.
	* testsuite/gas/bpf/indcall-bad-1.s: Likewise.
	* testsuite/gas/bpf/bpf.exp: Run new tests.

opcodes/
	* bpf-desc.c: Regenerate.
	* bpf-desc.h: Likewise.
	* bpf-opc.c: Likewise.
	* bpf-opc.h: Likewise.
	* disassemble.c (disassemble_init_for_target): Set bits for xBPF
	ISA when appropriate.

5 files changed, 43 insertions, 0 deletions

diff --git a/gas/testsuite/gas/bpf/bpf.exp b/gas/testsuite/gas/bpf/bpf.exp
index 6225d0b..242b190 100644
--- a/gas/testsuite/gas/bpf/bpf.exp
+++ b/gas/testsuite/gas/bpf/bpf.exp
@@ -38,4 +38,7 @@ if {[istarget bpf*-*-*]} {
     run_dump_test exit-be
     run_dump_test atomic-be
     run_dump_test data-be
+
+    run_dump_test indcall-1
+    run_list_test indcall-bad-1
 }
diff --git a/gas/testsuite/gas/bpf/indcall-1.d b/gas/testsuite/gas/bpf/indcall-1.d
new file mode 100644
index 0000000..e61e125
--- /dev/null
+++ b/gas/testsuite/gas/bpf/indcall-1.d
@@ -0,0 +1,22 @@
+#as: -mxbpf --EL
+#objdump: -mxbpf -dr
+#name: BPF indirect call 1
+
+.*: +file format .*bpf.*
+
+Disassembly of section \.text:
+
+0000000000000000 <main>:
+   0:	b7 00 00 00 01 00 00 00 	mov %r0,1
+   8:	b7 01 00 00 01 00 00 00 	mov %r1,1
+  10:	b7 02 00 00 02 00 00 00 	mov %r2,2
+  18:	18 06 00 00 38 00 00 00 	lddw %r6,0x38
+  20:	00 00 00 00 00 00 00 00[    ]*
+			18: R_BPF_INSN_64	.text
+  28:	8d 06 00 00 00 00 00 00 	call %r6
+  30:	95 00 00 00 00 00 00 00 	exit
+
+0000000000000038 <bar>:
+  38:	b7 00 00 00 00 00 00 00 	mov %r0,0
+  40:	95 00 00 00 00 00 00 00 	exit
+#pass
diff --git a/gas/testsuite/gas/bpf/indcall-1.s b/gas/testsuite/gas/bpf/indcall-1.s
new file mode 100644
index 0000000..5d49e41
--- /dev/null
+++ b/gas/testsuite/gas/bpf/indcall-1.s
@@ -0,0 +1,14 @@
+
+    .text
+    .align 4
+main:
+    mov %r0, 1
+    mov %r1, 1
+    mov %r2, 2
+    lddw %r6, bar
+    call %r6
+    exit
+
+bar:
+    mov %r0, 0
+    exit
diff --git a/gas/testsuite/gas/bpf/indcall-bad-1.l b/gas/testsuite/gas/bpf/indcall-bad-1.l
new file mode 100644
index 0000000..510ec6e
--- /dev/null
+++ b/gas/testsuite/gas/bpf/indcall-bad-1.l
@@ -0,0 +1,3 @@
+.*: Assembler messages:
+.* Error: illegal operand `call %r6'
+#pass
diff --git a/gas/testsuite/gas/bpf/indcall-bad-1.s b/gas/testsuite/gas/bpf/indcall-bad-1.s
new file mode 100644
index 0000000..0cdc4ab
--- /dev/null
+++ b/gas/testsuite/gas/bpf/indcall-bad-1.s
@@ -0,0 +1 @@
+    call %r6