gdb/testsuite: add tests for unwinding of pseudo registers

This patch adds tests to exercise the previous patches' changes.

All three tests:

 - aarch64-pseudo-unwind
 - amd64-pseudo-unwind
 - arm-pseudo-unwind

follow the same pattern, just with different registers.

The other test, arm-pseudo-unwind-legacy, tests the special case where
the unwind information contains an entry for a register considered a
pseudo-register by GDB.

Change-Id: Ic29ac040c5eb087b4a0d79f9d02f65b7979df30f
Reviewed-By: John Baldwin <jhb@FreeBSD.org>
Reviewed-by: Luis Machado <luis.machado@arm.com>
Approved-By: Luis Machado <luis.machado@arm.com> (aarch64/arm)
Tested-By: Luis Machado <luis.machado@arm.com> (aarch64/arm)

1 files changed, 66 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.arch/amd64-pseudo-unwind-asm.S b/gdb/testsuite/gdb.arch/amd64-pseudo-unwind-asm.S
new file mode 100644
index 0000000..c306b82
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/amd64-pseudo-unwind-asm.S
@@ -0,0 +1,66 @@
+/* Copyright 2018-2023 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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, see <http://www.gnu.org/licenses/>.  */
+
+.section .note.GNU-stack,"",%progbits
+
+.text
+.global callee
+callee:
+	/* Standard prologue.  */
+.cfi_startproc
+	push %rbp
+.cfi_def_cfa rbp, 16
+	mov %rsp, %rbp
+
+	/* Save caller's rbx value on the stack.  */
+.cfi_offset rbx, -24
+	push %rbx
+
+	/* Put our own rbx value.  */
+	mov $0x2021222324252627, %rbx
+break_here_asm:
+
+	/* Restore caller's rbx value.  */
+	pop %rbx
+
+	/* Standard epilogue.  */
+	pop %rbp
+	ret
+.cfi_endproc
+
+
+.global caller
+caller:
+.cfi_startproc
+	/* Standard prologue.  */
+	push %rbp
+.cfi_def_cfa_offset 16
+	mov %rsp, %rbp
+
+	/* Put our own rbx value.  */
+	mov $0x1011121314151617, %rbx
+
+	/* Call callee.  */
+	call callee
+
+	/* Store our rbx value in rax to return it.  */
+	mov %rbx, %rax
+
+	/* Standard epilogue.  */
+	pop %rbp
+	ret
+.cfi_endproc