gas: aarch64: testsuite: add new tests for SCFI

Similar to the x86_64 testcases, some .s files contain the corresponding
CFI directives.  This helps in validating the synthesized CFI by running
those tests with and without the --scfi=experimental command line
option.

Apart from the existing scfi-diag-*.s tests in gas/scfi/x86_64
directory, the newly added scfi-diag-1.s in this patch highlights an
aarch64-specific diagnostic:

  "Warning: SCFI: ignored probable save/restore op with reg offset"

Additionally, some testcases are added to showcase the (currently) unsupported
patterns, e.g., scfi-unsupported-1.s
        mov     x16, 4384
        sub     sp, sp, x16

gas/testsuite/:
	* gas/scfi/README: Update comment to include aarch64.
	* gas/scfi/aarch64/scfi-aarch64.exp: New file.
	* gas/scfi/aarch64/ginsn-cofi-1.l: New test.
	* gas/scfi/aarch64/ginsn-cofi-1.s: New test.
	* gas/scfi/aarch64/ginsn-ldst-1.l: New test.
	* gas/scfi/aarch64/ginsn-ldst-1.s: New test.
	* gas/scfi/aarch64/scfi-cb-1.d: New test.
	* gas/scfi/aarch64/scfi-cb-1.l: New test.
	* gas/scfi/aarch64/scfi-cb-1.s: New test.
	* gas/scfi/aarch64/scfi-cfg-1.d: New test.
	* gas/scfi/aarch64/scfi-cfg-1.l: New test.
	* gas/scfi/aarch64/scfi-cfg-1.s: New test.
	* gas/scfi/aarch64/scfi-cfg-2.d: New test.
	* gas/scfi/aarch64/scfi-cfg-2.l: New test.
	* gas/scfi/aarch64/scfi-cfg-2.s: New test.
	* gas/scfi/aarch64/scfi-cfg-3.d: New test.
	* gas/scfi/aarch64/scfi-cfg-3.l: New test.
	* gas/scfi/aarch64/scfi-cfg-3.s: New test.
	* gas/scfi/aarch64/scfi-cond-br-1.d: New test.
	* gas/scfi/aarch64/scfi-cond-br-1.l: New test.
	* gas/scfi/aarch64/scfi-cond-br-1.s: New test.
	* gas/scfi/aarch64/scfi-diag-1.l: New test.
	* gas/scfi/aarch64/scfi-diag-1.s: New test.
	* gas/scfi/aarch64/scfi-ldrp-1.d: New test.
	* gas/scfi/aarch64/scfi-ldrp-1.l: New test.
	* gas/scfi/aarch64/scfi-ldrp-1.s: New test.
	* gas/scfi/aarch64/scfi-ldrp-2.d: New test.
	* gas/scfi/aarch64/scfi-ldrp-2.l: New test.
	* gas/scfi/aarch64/scfi-ldrp-2.s: New test.
	* gas/scfi/aarch64/scfi-strp-1.d: New test.
	* gas/scfi/aarch64/scfi-strp-1.l: New test.
	* gas/scfi/aarch64/scfi-strp-1.s: New test.
	* gas/scfi/aarch64/scfi-strp-2.d: New test.
	* gas/scfi/aarch64/scfi-strp-2.l: New test.
	* gas/scfi/aarch64/scfi-strp-2.s: New test.

gas/testsuite/gas/scfi/README

@@ -1,6 +1,6 @@
 Notes on the SCFI testsuite in GAS:
 
-* At this time, SCFI machinery is only supported for x86_64.
+* At this time, SCFI machinery is only supported for x86_64 and aarch64.
 
 * When adding more tests, please keep CFI annotations updated in the .s files.
   Ideally the test should be run with and without --scfi (as is done currently

gas/testsuite/gas/scfi/aarch64/ginsn-cofi-1.l

@@ -0,0 +1,30 @@
+.*: Assembler messages:
+.*:16: Error: untraceable control flow for func 'foo'
+
+AARCH64 GAS  .*
+
+   1              	# Testcase for a variety of change of flow instructions
+   2              	# Because some of these are indirect branches, SCFI will bail out
+   3              	# with an error.  This test merely checks that the ginsn creation
+   4              	# process can handle these insns gracefully.
+   5              		.text
+   6              		.align  2
+   7              		.global foo
+   8              		.type   foo, %function
+   8              	ginsn: SYM FUNC_BEGIN
+   9              	foo:
+   9              	ginsn: SYM foo
+  10 \?\?\?\? 00000094 		bl      dump_bt
+  10              	ginsn: CALL
+  11 \?\?\?\? 02000014 		b       .L3
+  11              	ginsn: JMP 
+  12 \?\?\?\? 20021FD6 		br      x17
+  12              	ginsn: JMP %r17, 
+  13              	.L3:
+  13              	ginsn: SYM .L3
+  14 \?\?\?\? 60003FD6 		blr     x3
+  14              	ginsn: CALL
+  15 \?\?\?\? C0035FD6 		ret
+  15              	ginsn: RET
+  16              		.size   foo, .-foo
+  16              	ginsn: SYM FUNC_END

gas/testsuite/gas/scfi/aarch64/ginsn-cofi-1.s

@@ -0,0 +1,16 @@
+# Testcase for a variety of change of flow instructions
+# Because some of these are indirect branches, SCFI will bail out
+# with an error.  This test merely checks that the ginsn creation
+# process can handle these insns gracefully.
+	.text
+	.align  2
+	.global foo
+	.type   foo, %function
+foo:
+	bl      dump_bt
+	b       .L3
+	br      x17
+.L3:
+	blr     x3
+	ret
+	.size   foo, .-foo

gas/testsuite/gas/scfi/aarch64/ginsn-ldst-1.l

@@ -0,0 +1,40 @@
+AARCH64 GAS  .*
+
+   1              	# Testcase for a variety of ld st instructions
+   2              		.text
+   3              		.align  2
+   4              		.global foo
+   5              		.type   foo, %function
+   5              	ginsn: SYM FUNC_BEGIN
+   6              	foo:
+   6              	ginsn: SYM foo
+   7              	# ldstpair_indexed
+   8 0000 FFFF8629 		stp     wzr, wzr, \[sp, 52\]!
+   8              	ginsn: ADD %r31, 52, %r31
+   8              	ginsn: STORE %r1, \[%r31\+0\]
+   8              	ginsn: STORE %r1, \[%r31\+4\]
+   9 0004 E00782A9 		stp     x0, x1, \[sp, 32\]!
+   9              	ginsn: ADD %r31, 32, %r31
+   9              	ginsn: STORE %r0, \[%r31\+0\]
+   9              	ginsn: STORE %r1, \[%r31\+8\]
+  10 0008 E827BC6D 		stp     d8, d9, \[sp, -64\]!
+  10              	ginsn: ADD %r31, -64, %r31
+  11              	# Following is skipped from ginsn generation
+  12 000c E00702AD 		stp     q0, q1, \[sp, 64\]
+  13              	# ldstpair_off
+  14 0010 FFFF0629 		stp     wzr, wzr, \[sp, 52\]
+  14              	ginsn: STORE %r1, \[%r31\+52\]
+  14              	ginsn: STORE %r1, \[%r31\+56\]
+  15 0014 1F7840AD 		ldp     q31, q30, \[x0\]
+  16 0018 E827C46C 		ldp     d8,  d9,  \[sp\], 64
+  16              	ginsn: ADD %r31, 64, %r31
+  17              	# ldst_imm9
+  18 001c E7FF4F38 		ldrb    w7, \[sp, 255\]!
+  18              	ginsn: ADD %r31, 255, %r31
+  18              	ginsn: LOAD \[%r31\+0\], %r7
+  19 0020 FDCFC23C 		ldr     q29, \[sp, 44\]!
+  19              	ginsn: ADD %r31, 44, %r31
+  20 0024 C0035FD6 		ret
+  20              	ginsn: RET
+  21              		.size   foo, .-foo
+  21              	ginsn: SYM FUNC_END

gas/testsuite/gas/scfi/aarch64/ginsn-ldst-1.s

@@ -0,0 +1,21 @@
+# Testcase for a variety of ld st instructions
+	.text
+	.align  2
+	.global foo
+	.type   foo, %function
+foo:
+# ldstpair_indexed
+	stp     wzr, wzr, [sp, 52]!
+	stp     x0, x1, [sp, 32]!
+	stp     d8, d9, [sp, -64]!
+# Following is skipped from ginsn generation
+	stp     q0, q1, [sp, 64]
+# ldstpair_off
+	stp     wzr, wzr, [sp, 52]
+	ldp     q31, q30, [x0]
+	ldp     d8,  d9,  [sp], 64
+# ldst_imm9
+	ldrb    w7, [sp, 255]!
+	ldr     q29, [sp, 44]!
+	ret
+	.size   foo, .-foo

gas/testsuite/gas/scfi/aarch64/ginsn-misc-1.l

@@ -0,0 +1,32 @@
+.*: Assembler messages:
+.*:9: Error: SCFI: unsupported stack manipulation pattern
+.*:15: Error: SCFI: forward pass failed for func 'foo'
+
+AARCH64 GAS  .*
+
+
+   1              	# Testcase for a variety of misc instructions
+   2              	# Ensure graceful handling, irrespective of ginsn generation
+   3              	symbol:
+   4 \?\?\?\? 7700     	        .string "w"
+   5              	
+   6              		.type   foo, %function
+   6              	ginsn: SYM FUNC_BEGIN
+   7              	foo:
+   7              	ginsn: SYM foo
+   8 \?\?\?\? 00001024 		mov     x16, 4384
+   8      82D2
+   8              	ginsn: MOV 4384, %r16
+   9 \?\?\?\? FF63308B 		add     sp, sp, x16
+   9              	ginsn: ADD %r31, %r16, %r31
+  10 \?\?\?\? 00000090 	        adrp    x0, symbol
+  11 \?\?\?\? 1F000091 		add     sp, x0, :lo12:symbol
+  11              	ginsn: OTH 0, 0, %r31
+  12 \?\?\?\? FF0F00D1 		sub     sp, sp, 3
+  12              	ginsn: SUB %r31, 3, %r31
+  13 \?\?\?\? FF0F0091 		add     sp, sp, 3
+  13              	ginsn: ADD %r31, 3, %r31
+  14 \?\?\?\? C0035FD6 		ret
+  14              	ginsn: RET
+  15              		.size   foo,.-foo
+  15              	ginsn: SYM FUNC_END

gas/testsuite/gas/scfi/aarch64/ginsn-misc-1.s

@@ -0,0 +1,15 @@
+# Testcase for a variety of misc instructions
+# Ensure graceful handling, irrespective of ginsn generation
+symbol:
+        .string "w"
+
+	.type   foo, %function
+foo:
+	mov     x16, 4384
+	add     sp, sp, x16
+        adrp    x0, symbol
+	add     sp, x0, :lo12:symbol
+	sub     sp, sp, 3
+	add     sp, sp, 3
+	ret
+	.size   foo,.-foo

gas/testsuite/gas/scfi/aarch64/scfi-aarch64.exp

@@ -0,0 +1,59 @@
+# Copyright (C) 2022-2023 Free Software Foundation, Inc.
+
+# This program 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 of the License, or
+# (at your option) any later version.
+#
+# This program 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 this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
+
+if { ![is_elf_format] } then {
+    return
+}
+
+# common tests
+if  { ([istarget "aarch64-*-*"]) } then {
+
+    global ASFLAGS
+    set old_ASFLAGS "$ASFLAGS"
+
+    run_list_test "ginsn-cofi-1" "--scfi=experimental -ali --warn"
+    run_list_test "ginsn-ldst-1" "--scfi=experimental -ali --warn"
+    run_list_test "ginsn-misc-1" "--scfi=experimental -ali --warn"
+
+    run_list_test "scfi-diag-1" "--scfi=experimental"
+
+    run_list_test "scfi-unsupported-1" "--scfi=experimental"
+
+    run_dump_test "scfi-ldrp-1"
+    run_list_test "scfi-ldrp-1" "--scfi=experimental --warn"
+    run_dump_test "scfi-ldrp-2"
+    run_list_test "scfi-ldrp-2" "--scfi=experimental --warn"
+
+    run_dump_test "scfi-strp-1"
+    run_list_test "scfi-strp-1" "--scfi=experimental --warn"
+    run_dump_test "scfi-strp-2"
+    run_list_test "scfi-strp-2" "--scfi=experimental --warn"
+
+    run_dump_test "scfi-cb-1"
+    run_list_test "scfi-cb-1" "--scfi=experimental --warn"
+    run_dump_test "scfi-cond-br-1"
+    run_list_test "scfi-cond-br-1" "--scfi=experimental --warn"
+
+    run_dump_test "scfi-cfg-1"
+    run_list_test "scfi-cfg-1" "--scfi=experimental --warn"
+
+    run_dump_test "scfi-cfg-2"
+    run_list_test "scfi-cfg-2" "--scfi=experimental --warn"
+
+    run_dump_test "scfi-cfg-3"
+    run_list_test "scfi-cfg-3" "--scfi=experimental --warn"
+
+}

gas/testsuite/gas/scfi/aarch64/scfi-cb-1.d

@@ -0,0 +1,20 @@
+#as: --scfi=experimental -W
+#objdump: -Wf
+#name: Synthesize CFI for comp branch 1
+#...
+Contents of the .eh_frame section:
+
+
+0+0000 0+0010 0+0000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 4
+  Data alignment factor: -8
+  Return address column: 30
+  Augmentation data:     1b
+  DW_CFA_def_cfa: r31 \(sp\) ofs 0
+
+0+0014 0+0010 00000018 FDE cie=00000000 pc=0+0000..0+0014
+  DW_CFA_nop
+
+#pass

gas/testsuite/gas/scfi/aarch64/scfi-cb-1.l

@@ -0,0 +1,2 @@
+.*Assembler messages:
+.*5: Warning: SCFI ignores most user-specified CFI directives

gas/testsuite/gas/scfi/aarch64/scfi-cb-1.s

@@ -0,0 +1,14 @@
+	.text
+	.global foo
+	.type  foo, %function
+foo:
+	.cfi_startproc
+.L7:
+	add     w4, w3, w1
+	cbnz    w4, .L7
+	cbz     w4, .L10
+	tbnz    w0, #31, .L7
+.L10:
+	ret
+	.cfi_endproc
+	.size   foo, .-foo

gas/testsuite/gas/scfi/aarch64/scfi-cfg-1.d

@@ -0,0 +1,31 @@
+#as: --scfi=experimental -W
+#objdump: -Wf
+#name: Synthesize CFI for cfg 1
+#...
+Contents of the .eh_frame section:
+
+
+0+0000 0+0010 0+0000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 4
+  Data alignment factor: -8
+  Return address column: 30
+  Augmentation data:     1b
+  DW_CFA_def_cfa: r31 \(sp\) ofs 0
+
+0+0014 0+0020 0+0018 FDE cie=00000000 pc=0+0000..0+0068
+  DW_CFA_advance_loc: 4 to 0+0004
+  DW_CFA_def_cfa_offset: 48
+  DW_CFA_offset: r29 \(x29\) at cfa-48
+  DW_CFA_offset: r30 \(x30\) at cfa-40
+  DW_CFA_advance_loc: 4 to 0+0008
+  DW_CFA_def_cfa_register: r29 \(x29\)
+  DW_CFA_advance_loc: 92 to 0+0064
+  DW_CFA_def_cfa_register: r31 \(sp\)
+  DW_CFA_restore: r29 \(x29\)
+  DW_CFA_restore: r30 \(x30\)
+  DW_CFA_def_cfa_offset: 0
+  DW_CFA_nop
+
+#pass

gas/testsuite/gas/scfi/aarch64/scfi-cfg-1.l

@@ -0,0 +1,2 @@
+.*Assembler messages:
+.*6: Warning: SCFI ignores most user-specified CFI directives

gas/testsuite/gas/scfi/aarch64/scfi-cfg-1.s

@@ -0,0 +1,46 @@
+# Testcase for forward flow of SCFI information
+# and CFG creation as well.  This testcase has two backward edges
+# (one of which is a loop) and one exit path.
+	.type   foo, %function
+foo:
+	.cfi_startproc
+	stp    x29, x30, [sp, -48]!
+	.cfi_def_cfa_offset 48
+	.cfi_offset 29, -48
+	.cfi_offset 30, -40
+	mov     x29, sp
+	.cfi_def_cfa_register 29
+	str     x0, [sp, 24]
+	adrp    x0, :got:xyz
+	str     x0, [sp, 40]
+	b       .L7
+.L10:
+	ldr     x0, [sp, 40]
+	ldr     x0, [x0]
+	mov     x1, x0
+	ldr     x0, [sp, 24]
+	bl      strcmp
+	cmp     w0, 0
+	bne     .L8
+	ldr     x0, [sp, 40]
+	ldr     w0, [x0, 8]
+	b       .L9
+.L8:
+	ldr     x0, [sp, 40]
+	add     x0, x0, 24
+	str     x0, [sp, 40]
+.L7:
+	ldr     x0, [sp, 40]
+	ldr     w0, [x0, 8]
+	cmp     w0, 0
+	bne     .L10
+	mov     w0, 0
+.L9:
+	ldp     x29, x30, [sp], 48
+	.cfi_def_cfa_register 31
+	.cfi_restore 30
+	.cfi_restore 29
+	.cfi_def_cfa_offset 0
+	ret
+	.cfi_endproc
+	.size   foo, .-foo

gas/testsuite/gas/scfi/aarch64/scfi-cfg-2.d

@@ -0,0 +1,40 @@
+#as: --scfi=experimental -W
+#objdump: -Wf
+#name: Synthesize CFI for cfg 2
+#...
+Contents of the .eh_frame section:
+
+
+0+0000 0+0010 0+0000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 4
+  Data alignment factor: -8
+  Return address column: 30
+  Augmentation data:     1b
+  DW_CFA_def_cfa: r31 \(sp\) ofs 0
+
+0+0014 0+[0-9a-f]+ 0+0018 FDE cie=00000000 pc=0+0000..0+0028
+  DW_CFA_advance_loc: 4 to 0+0004
+  DW_CFA_def_cfa_offset: 48
+  DW_CFA_offset: r29 \(x29\) at cfa-48
+  DW_CFA_offset: r30 \(x30\) at cfa-40
+  DW_CFA_advance_loc: 4 to 0+0008
+  DW_CFA_def_cfa_register: r29 \(x29\)
+  DW_CFA_advance_loc: 8 to 0+0010
+  DW_CFA_remember_state
+  DW_CFA_advance_loc: 8 to 0+0018
+  DW_CFA_def_cfa_register: r31 \(sp\)
+  DW_CFA_restore: r29 \(x29\)
+  DW_CFA_restore: r30 \(x30\)
+  DW_CFA_def_cfa_offset: 0
+  DW_CFA_advance_loc: 4 to 0+001c
+  DW_CFA_restore_state
+  DW_CFA_advance_loc: 8 to 0+0024
+  DW_CFA_def_cfa_register: r31 \(sp\)
+  DW_CFA_restore: r29 \(x29\)
+  DW_CFA_restore: r30 \(x30\)
+  DW_CFA_def_cfa_offset: 0
+  DW_CFA_nop
+
+#pass

gas/testsuite/gas/scfi/aarch64/scfi-cfg-2.l

@@ -0,0 +1,2 @@
+.*Assembler messages:
+.*13: Warning: SCFI ignores most user-specified CFI directives

gas/testsuite/gas/scfi/aarch64/scfi-cfg-2.s

@@ -0,0 +1,42 @@
+# Testcase for backward flow of SCFI state.
+# The cfg has two exit paths, with epilogue duplicated in
+# the two.
+#
+# SCFI must synthesize the remember_state / restore_state pair.
+# Note how SCFI does not necessary generate the least number of
+# CFI directives (.cfi_remember_state can possibly be clubbed
+# together with other immediately following CFI directives).
+# This is not a correctness issue, however.
+	.global foo
+	.type   foo, %function
+foo:
+	.cfi_startproc
+	stp     x29, x30, [sp, -48]!
+	.cfi_def_cfa_offset 48
+	.cfi_offset 29, -48
+	.cfi_offset 30, -40
+	mov     x29, sp
+	.cfi_def_cfa_register 29
+	cmp     w4, w19
+	bge     .L1
+
+.L2:
+	.cfi_remember_state
+	bl      bar
+	ldp     x29, x30, [sp], 48
+	.cfi_def_cfa_register 31
+	.cfi_restore 29
+	.cfi_restore 30
+	.cfi_def_cfa_offset 0
+	ret
+.L1:
+	.cfi_restore_state
+	cbz     w3, .L2
+	ldp     x29, x30, [sp], 48
+	.cfi_def_cfa_register 31
+	.cfi_restore 29
+	.cfi_restore 30
+	.cfi_def_cfa_offset 0
+	ret
+	.cfi_endproc
+	.size   foo, .-foo

gas/testsuite/gas/scfi/aarch64/scfi-cfg-3.d

@@ -0,0 +1,32 @@
+#as: --scfi=experimental -W
+#objdump: -Wf
+#name: Synthesize CFI for cfg 3
+#...
+Contents of the .eh_frame section:
+
+
+0+0000 0+0010 0+0000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 4
+  Data alignment factor: -8
+  Return address column: 30
+  Augmentation data:     1b
+  DW_CFA_def_cfa: r31 \(sp\) ofs 0
+
+0+0014 0+0020 0+0018 FDE cie=00000000 pc=0+0000..0+002c
+  DW_CFA_advance_loc: 4 to 0+0004
+  DW_CFA_def_cfa_offset: 32
+  DW_CFA_offset: r29 \(x29\) at cfa-32
+  DW_CFA_offset: r30 \(x30\) at cfa-24
+  DW_CFA_advance_loc: 4 to 0+0008
+  DW_CFA_def_cfa_register: r29 \(x29\)
+  DW_CFA_advance_loc: 32 to 0+0028
+  DW_CFA_def_cfa_register: r31 \(sp\)
+  DW_CFA_restore: r29 \(x29\)
+  DW_CFA_restore: r30 \(x30\)
+  DW_CFA_def_cfa_offset: 0
+  DW_CFA_nop
+  DW_CFA_nop
+
+#pass

gas/testsuite/gas/scfi/aarch64/scfi-cfg-3.l

@@ -0,0 +1,2 @@
+.*Assembler messages:
+.*9: Warning: SCFI ignores most user-specified CFI directives

gas/testsuite/gas/scfi/aarch64/scfi-cfg-3.s

@@ -0,0 +1,34 @@
+# Testcase for cfg creation.
+# There is at least one bb here with a single GINSN_TYPE_SYMBOL instruction
+# for a user-defined label.  This ginsn is visited in the fallthrough path of
+# another bb.
+	.text
+	.global main
+	.type   main, %function
+main:
+	.cfi_startproc
+	stp     x29, x30, [sp, -32]!
+	.cfi_def_cfa_offset 32
+	.cfi_offset 29, -32
+	.cfi_offset 30, -24
+	mov     x29, sp
+	.cfi_def_cfa_register 29
+	cmp     w0, 0
+	bne     .L2
+#	ldr	x0, [sp, 24]
+#	bl	fclose
+	cmp     w0, 0
+	beq     .L3
+.L2:
+	mov     w0, 1
+	b       .L5
+.L3:
+	mov     w0, 0
+.L5:
+	ldp     x29, x30, [sp], 32
+	.cfi_def_cfa_register 31
+	.cfi_restore 29
+	.cfi_restore 30
+	.cfi_def_cfa_offset 0
+	ret
+	.cfi_endproc

gas/testsuite/gas/scfi/aarch64/scfi-cond-br-1.d

@@ -0,0 +1,20 @@
+#as: --scfi=experimental -W
+#objdump: -Wf
+#name: Synthesize CFI for conditional br 1
+#...
+Contents of the .eh_frame section:
+
+
+0+0000 0+0010 0+0000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 4
+  Data alignment factor: -8
+  Return address column: 30
+  Augmentation data:     1b
+  DW_CFA_def_cfa: r31 \(sp\) ofs 0
+
+0+0014 0+0010 00000018 FDE cie=00000000 pc=0+0000..0+0010
+  DW_CFA_nop
+
+#pass

gas/testsuite/gas/scfi/aarch64/scfi-cond-br-1.l

@@ -0,0 +1,2 @@
+.*Assembler messages:
+.*6: Warning: SCFI ignores most user-specified CFI directives

gas/testsuite/gas/scfi/aarch64/scfi-cond-br-1.s

@@ -0,0 +1,13 @@
+	.text
+	.align  2
+	.global foo
+	.type   foo, %function
+foo:
+	.cfi_startproc
+	bge     .L10
+	ble     .L10
+	bne     .L10
+.L10:
+	ret
+	.cfi_endproc
+	.size   foo, .-foo

gas/testsuite/gas/scfi/aarch64/scfi-diag-1.l

@@ -0,0 +1,2 @@
+.*Assembler messages:
+.*5: Warning: SCFI: ignored probable save/restore op with reg offset

gas/testsuite/gas/scfi/aarch64/scfi-diag-1.s

@@ -0,0 +1,6 @@
+	.text
+	.globl  foo
+	.type   foo, @function
+foo:
+	str     x19, [sp, x1]
+	.size   foo, .-foo

gas/testsuite/gas/scfi/aarch64/scfi-ldrp-1.d

@@ -0,0 +1,59 @@
+#as: --scfi=experimental -W
+#objdump: -Wf
+#name: Synthesize CFI for ldp ldr instructions
+#...
+Contents of the .eh_frame section:
+
+00000000 0+0010 00000000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 4
+  Data alignment factor: -8
+  Return address column: 30
+  Augmentation data:     1b
+  DW_CFA_def_cfa: r31 \(sp\) ofs 0
+
+00000014 0+0048 00000018 FDE cie=00000000 pc=0+0000..0+0040
+  DW_CFA_advance_loc: 4 to 0+0004
+  DW_CFA_def_cfa_offset: 128
+  DW_CFA_offset: r29 \(x29\) at cfa-128
+  DW_CFA_offset: r30 \(x30\) at cfa-120
+  DW_CFA_advance_loc: 4 to 0+0008
+  DW_CFA_def_cfa_register: r29 \(x29\)
+  DW_CFA_advance_loc: 4 to 0+000c
+  DW_CFA_offset: r19 \(x19\) at cfa-112
+  DW_CFA_offset: r20 \(x20\) at cfa-104
+  DW_CFA_advance_loc: 4 to 0+0010
+  DW_CFA_offset: r21 \(x21\) at cfa-96
+  DW_CFA_offset: r22 \(x22\) at cfa-88
+  DW_CFA_advance_loc: 4 to 0+0014
+  DW_CFA_offset: r23 \(x23\) at cfa-80
+  DW_CFA_offset: r24 \(x24\) at cfa-72
+  DW_CFA_advance_loc: 4 to 0+0018
+  DW_CFA_offset: r25 \(x25\) at cfa-64
+  DW_CFA_offset: r26 \(x26\) at cfa-56
+  DW_CFA_advance_loc: 4 to 0+001c
+  DW_CFA_offset: r27 \(x27\) at cfa-48
+  DW_CFA_advance_loc: 8 to 0+0024
+  DW_CFA_def_cfa_register: r31 \(sp\)
+  DW_CFA_advance_loc: 4 to 0+0028
+  DW_CFA_restore: r19 \(x19\)
+  DW_CFA_restore: r20 \(x20\)
+  DW_CFA_advance_loc: 4 to 0+002c
+  DW_CFA_restore: r21 \(x21\)
+  DW_CFA_restore: r22 \(x22\)
+  DW_CFA_advance_loc: 4 to 0+0030
+  DW_CFA_restore: r23 \(x23\)
+  DW_CFA_restore: r24 \(x24\)
+  DW_CFA_advance_loc: 4 to 0+0034
+  DW_CFA_restore: r25 \(x25\)
+  DW_CFA_restore: r26 \(x26\)
+  DW_CFA_advance_loc: 4 to 0+0038
+  DW_CFA_restore: r27 \(x27\)
+  DW_CFA_advance_loc: 4 to 0+003c
+  DW_CFA_restore: r29 \(x29\)
+  DW_CFA_restore: r30 \(x30\)
+  DW_CFA_def_cfa_offset: 0
+  DW_CFA_nop
+
+#pass

gas/testsuite/gas/scfi/aarch64/scfi-ldrp-1.l

@@ -0,0 +1,2 @@
+.*Assembler messages:
+.*8: Warning: SCFI ignores most user-specified CFI directives

gas/testsuite/gas/scfi/aarch64/scfi-ldrp-1.s

@@ -0,0 +1,52 @@
+# Testcase for various ldp / ldr instructions.
+# This test also serves for checking callee-saved regs.
+	.text
+	.align  2
+	.global foo
+	.type   foo, %function
+foo:
+	.cfi_startproc
+	stp     x29, x30, [sp, -128]!
+	.cfi_def_cfa_offset 128
+	.cfi_offset 29, -128
+	.cfi_offset 30, -120
+	mov     x29, sp
+	.cfi_def_cfa_register 29
+	stp     x19, x20, [sp, 16]
+	.cfi_offset 19, -112
+	.cfi_offset 20, -104
+	stp     x21, x22, [sp, 32]
+	.cfi_offset 21, -96
+	.cfi_offset 22, -88
+	stp     x23, x24, [sp, 48]
+	.cfi_offset 23, -80
+	.cfi_offset 24, -72
+	stp     x25, x26, [sp, 64]
+	.cfi_offset 25, -64
+	.cfi_offset 26, -56
+	str     x27, [sp, 80]
+	.cfi_offset 27, -48
+	mov     w0, 0
+	mov     sp, x29
+	.cfi_def_cfa_register 31
+	ldp     x19, x20, [sp, 16]
+	.cfi_restore 19
+	.cfi_restore 20
+	ldp     x21, x22, [sp, 32]
+	.cfi_restore 21
+	.cfi_restore 22
+	ldp     x23, x24, [sp, 48]
+	.cfi_restore 23
+	.cfi_restore 24
+	ldp     x25, x26, [sp, 64]
+	.cfi_restore 25
+	.cfi_restore 26
+	ldr     x27, [sp, 80]
+	.cfi_restore 27
+	ldp     x29, x30, [sp], 128
+	.cfi_restore 29
+	.cfi_restore 30
+	.cfi_def_cfa_offset 0
+	ret
+	.cfi_endproc
+	.size   foo, .-foo

gas/testsuite/gas/scfi/aarch64/scfi-ldrp-2.d

@@ -0,0 +1,33 @@
+#as: --scfi=experimental -W
+#objdump: -Wf
+#name: Synthesize CFI for ldr insns 2
+#...
+Contents of the .eh_frame section:
+
+00000000 0+0010 00000000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 4
+  Data alignment factor: -8
+  Return address column: 30
+  Augmentation data:     1b
+  DW_CFA_def_cfa: r31 \(sp\) ofs 0
+
+00000014 0+[0-9a-f]+ 00000018 FDE cie=00000000 pc=0+0000..0+0018
+  DW_CFA_advance_loc: 4 to 0+0004
+  DW_CFA_def_cfa_offset: 128
+  DW_CFA_offset: r29 \(x29\) at cfa-128
+  DW_CFA_offset: r30 \(x30\) at cfa-120
+  DW_CFA_advance_loc: 4 to 0+0008
+  DW_CFA_def_cfa_register: r29 \(x29\)
+  DW_CFA_advance_loc: 4 to 0+000c
+  DW_CFA_def_cfa_register: r31 \(sp\)
+  DW_CFA_advance_loc: 4 to 0+0010
+  DW_CFA_restore: r29 \(x29\)
+  DW_CFA_def_cfa_offset: 120
+  DW_CFA_advance_loc: 4 to 0+0014
+  DW_CFA_restore: r30 \(x30\)
+  DW_CFA_def_cfa_offset: 0
+  DW_CFA_nop
+
+#pass

gas/testsuite/gas/scfi/aarch64/scfi-ldrp-2.l

@@ -0,0 +1,2 @@
+.*Assembler messages:
+.*7: Warning: SCFI ignores most user-specified CFI directives

gas/testsuite/gas/scfi/aarch64/scfi-ldrp-2.s

@@ -0,0 +1,26 @@
+# Testcase for various ldp / ldr instructions
+	.text
+	.align  2
+	.global foo
+	.type   foo, %function
+foo:
+	.cfi_startproc
+	stp     x29, x30, [sp, -128]!
+	.cfi_def_cfa_offset 128
+	.cfi_offset 29, -128
+	.cfi_offset 30, -120
+	mov     x29, sp
+	.cfi_def_cfa_register 29
+	mov     sp, x29
+	.cfi_def_cfa_register 31
+# Post-indexed ldr
+	ldr     x29, [sp], 8
+	.cfi_restore 29
+	.cfi_def_cfa_offset 120
+# Post-indexed ldr
+	ldr     x30, [sp], 120
+	.cfi_restore 30
+	.cfi_def_cfa_offset 0
+	ret
+	.cfi_endproc
+	.size   foo, .-foo

gas/testsuite/gas/scfi/aarch64/scfi-strp-1.d

@@ -0,0 +1,39 @@
+#as: --scfi=experimental -W
+#objdump: -Wf
+#name: Synthesize CFI for str stp insns 1
+#...
+Contents of the .eh_frame section:
+
+00000000 0+0010 00000000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 4
+  Data alignment factor: -8
+  Return address column: 30
+  Augmentation data:     1b
+  DW_CFA_def_cfa: r31 \(sp\) ofs 0
+
+00000014 0+0030 00000018 FDE cie=00000000 pc=0+0000..0+002c
+  DW_CFA_advance_loc: 4 to 0+0004
+  DW_CFA_def_cfa_offset: 128
+  DW_CFA_offset: r29 \(x29\) at cfa-128
+  DW_CFA_offset: r30 \(x30\) at cfa-120
+  DW_CFA_advance_loc: 4 to 0+0008
+  DW_CFA_def_cfa_register: r29 \(x29\)
+  DW_CFA_advance_loc: 4 to 0+000c
+  DW_CFA_offset: r19 \(x19\) at cfa-112
+  DW_CFA_offset: r20 \(x20\) at cfa-104
+  DW_CFA_advance_loc: 4 to 0+0010
+  DW_CFA_offset: r21 \(x21\) at cfa-96
+  DW_CFA_offset: r22 \(x22\) at cfa-88
+  DW_CFA_advance_loc: 4 to 0+0014
+  DW_CFA_offset: r23 \(x23\) at cfa-80
+  DW_CFA_offset: r24 \(x24\) at cfa-72
+  DW_CFA_advance_loc: 4 to 0+0018
+  DW_CFA_offset: r25 \(x25\) at cfa-64
+  DW_CFA_offset: r26 \(x26\) at cfa-56
+  DW_CFA_advance_loc: 4 to 0+001c
+  DW_CFA_offset: r27 \(x27\) at cfa-48
+  DW_CFA_nop
+
+#pass

gas/testsuite/gas/scfi/aarch64/scfi-strp-1.l

@@ -0,0 +1,2 @@
+.*Assembler messages:
+.*6: Warning: SCFI ignores most user-specified CFI directives

gas/testsuite/gas/scfi/aarch64/scfi-strp-1.s

@@ -0,0 +1,37 @@
+## Testcase with a variety of str/stp instructions
+	.text
+	.globl  foo
+	.type   foo, @function
+foo:
+	.cfi_startproc
+# Pre-indexed addressing is like offset addressing, except that
+# the base pointer is updated as a result of the instruction.
+	stp     x29, x30, [sp, -128]!
+	.cfi_def_cfa_offset 128
+	.cfi_offset 29, -128
+	.cfi_offset 30, -120
+	mov     x29, sp
+	.cfi_def_cfa_register 29
+# Offset addressing mode is when ann offset can be applied optionally to the
+# base address.
+	stp     x19, x20, [sp, 16]
+	.cfi_offset 19, -112
+	.cfi_offset 20, -104
+	stp     x21, x22, [sp, 32]
+	.cfi_offset 21, -96
+	.cfi_offset 22, -88
+	stp     x23, x24, [sp, 48]
+	.cfi_offset 23, -80
+	.cfi_offset 24, -72
+	stp     x25, x26, [sp, 64]
+	.cfi_offset 25, -64
+	.cfi_offset 26, -56
+	str     x27, [sp, 80]
+	.cfi_offset 27, -48
+# Stores non callee-saved register on stack.
+	str     w0, [x29, 124]
+	str     wzr, [x29, 120]
+	str     w0, [x29, 120]
+	ret
+	.cfi_endproc
+	.size   foo, .-foo

gas/testsuite/gas/scfi/aarch64/scfi-strp-2.d

@@ -0,0 +1,35 @@
+#as: --scfi=experimental -W
+#objdump: -Wf
+#name: Synthesize CFI for str insns 2
+#...
+Contents of the .eh_frame section:
+
+00000000 0+0010 00000000 CIE
+  Version:               1
+  Augmentation:          "zR"
+  Code alignment factor: 4
+  Data alignment factor: -8
+  Return address column: 30
+  Augmentation data:     1b
+  DW_CFA_def_cfa: r31 \(sp\) ofs 0
+
+00000014 0+0028 00000018 FDE cie=00000000 pc=0+0000..0+001c
+  DW_CFA_advance_loc: 4 to 0+0004
+  DW_CFA_def_cfa_offset: 128
+  DW_CFA_offset: r29 \(x29\) at cfa-128
+  DW_CFA_offset: r30 \(x30\) at cfa-120
+  DW_CFA_advance_loc: 4 to 0+0008
+  DW_CFA_def_cfa_register: r29 \(x29\)
+  DW_CFA_advance_loc: 4 to 0+000c
+  DW_CFA_offset: r27 \(x27\) at cfa-128
+  DW_CFA_advance_loc: 4 to 0+0010
+  DW_CFA_def_cfa_register: r31 \(sp\)
+  DW_CFA_advance_loc: 4 to 0+0014
+  DW_CFA_restore: r29 \(x29\)
+  DW_CFA_def_cfa_offset: 120
+  DW_CFA_advance_loc: 4 to 0+0018
+  DW_CFA_restore: r30 \(x30\)
+  DW_CFA_def_cfa_offset: 0
+  DW_CFA_nop
+
+#pass

gas/testsuite/gas/scfi/aarch64/scfi-strp-2.l

@@ -0,0 +1,2 @@
+.*Assembler messages:
+.*7: Warning: SCFI ignores most user-specified CFI directives

gas/testsuite/gas/scfi/aarch64/scfi-strp-2.s

@@ -0,0 +1,30 @@
+# Testcase for a variety of stp/str including a post-indexed store
+	.text
+	.align  2
+	.global foo
+	.type   foo, %function
+foo:
+	.cfi_startproc
+	stp     x29, x30, [sp, -128]!
+	.cfi_def_cfa_offset 128
+	.cfi_offset 29, -128
+	.cfi_offset 30, -120
+	mov     x29, sp
+	.cfi_def_cfa_register 29
+# post-indexed store, a stack corrupting one which over-writes
+# x29!  Only for testing purposes for now
+# This does not generate a .cfi_def_cfa_offset 208 because
+# CFA is REG_FP based
+	str     x27, [sp], 80
+	.cfi_offset 27, -128
+	mov     sp, x29
+	.cfi_def_cfa_register 31
+	ldr     x29, [sp], 8
+	.cfi_restore 29
+	.cfi_def_cfa_offset 120
+	ldr     x30, [sp], 120
+	.cfi_restore 30
+	.cfi_def_cfa_offset 0
+	ret
+	.cfi_endproc
+	.size   foo, .-foo

gas/testsuite/gas/scfi/aarch64/scfi-unsupported-1.l

@@ -0,0 +1,4 @@
+.*Assembler messages:
+.*7: Warning: SCFI ignores most user-specified CFI directives
+.*9: Error: SCFI: unsupported stack manipulation pattern
+.*31: Error: SCFI: forward pass failed for func 'foo'

gas/testsuite/gas/scfi/aarch64/scfi-unsupported-1.s

@@ -0,0 +1,31 @@
+# Testcase where immediate used for stack allocation is a wide
+# one.  Since SCFI does not currently have any data-flow
+# capabilities, this is currently not supported.
+	.global	foo
+	.type	foo, %function
+foo:
+	.cfi_startproc
+	mov	x16, 4384
+	sub	sp, sp, x16
+	.cfi_def_cfa_offset 4384
+	stp	x29, x30, [sp]
+	.cfi_offset 29, -4384
+	.cfi_offset 30, -4376
+	mov	x29, sp
+	str	x0, [sp, 24]
+	str	x1, [sp, 16]
+	add	x0, sp, 4096
+	add	x0, x0, 112
+	bl	bar
+.L1:
+	str	xzr, [sp, 4376]
+.L2:
+	ldp	x29, x30, [sp]
+	mov	x16, 4384
+	add	sp, sp, x16
+	.cfi_restore 29
+	.cfi_restore 30
+	.cfi_def_cfa_offset 0
+	ret
+	.cfi_endproc
+	.size	foo, .-foo