btrace: Extend ptwrite event decoding.

Call the ptwrite filter function whenever a ptwrite event is decoded.
The returned string is written to the aux_data string table and a
corresponding auxiliary instruction is appended to the function segment.

Approved-By: Markus Metzger <markus.t.metzger@intel.com>
Reviewed-By: Eli Zaretskii <eliz@gnu.org>

8 files changed, 1638 insertions, 0 deletions

diff --git a/gdb/NEWS b/gdb/NEWS
index dfcabb1..81aa8af 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -3,6 +3,13 @@
 
 *** Changes since GDB 15
 
+* GDB now supports printing of ptwrite payloads from the Intel Processor
+  Trace during 'record instruction-history', 'record function-call-history'
+  and all stepping commands.  The payload is also accessible in Python as a
+  RecordAuxiliary object.  Printing is customizable via a ptwrite filter
+  function in Python.  By default, the raw ptwrite payload is printed for
+  each ptwrite that is encountered.
+
 * Python API
 
   ** Added gdb.record.clear.  Clears the trace data of the current recording.
diff --git a/gdb/btrace.c b/gdb/btrace.c
index d493fbe..95ff27c 100644
--- a/gdb/btrace.c
+++ b/gdb/btrace.c
@@ -41,6 +41,7 @@
 #include <inttypes.h>
 #include <ctype.h>
 #include <algorithm>
+#include <string>
 
 /* Command lists for btrace maintenance commands.  */
 static struct cmd_list_element *maint_btrace_cmdlist;
@@ -1204,6 +1205,24 @@ pt_btrace_insn (const struct pt_insn &insn)
 	  pt_btrace_insn_flags (insn)};
 }
 
+#if defined (HAVE_PT_INSN_EVENT)
+/* Helper for events that will result in an aux_insn.  */
+
+static void
+handle_pt_aux_insn (btrace_thread_info *btinfo, btrace_function *bfun,
+		    std::string &aux_str, CORE_ADDR ip)
+{
+  btinfo->aux_data.emplace_back (std::move (aux_str));
+  bfun = ftrace_update_function (btinfo, ip);
+
+  btrace_insn insn {btinfo->aux_data.size () - 1, 0,
+		    BTRACE_INSN_AUX, 0};
+
+  ftrace_update_insns (bfun, insn);
+}
+
+#endif /* defined (HAVE_PT_INSN_EVENT) */
+
 /* Handle instruction decode events (libipt-v2).  */
 
 static int
@@ -1252,6 +1271,60 @@ handle_pt_insn_events (struct btrace_thread_info *btinfo,
 		   bfun->insn_offset - 1, offset);
 
 	  break;
+#if defined (HAVE_STRUCT_PT_EVENT_VARIANT_PTWRITE)
+	case ptev_ptwrite:
+	  {
+	    uint64_t pc = 0;
+	    std::optional<std::string> ptw_string;
+
+	    /* Lookup the PC if available.  The event often doesn't provide
+	       one, so we look into the last function segment as well.
+	       Looking further back makes limited sense for ptwrite.  */
+	    if (event.ip_suppressed == 0)
+	      pc = event.variant.ptwrite.ip;
+	    else if (!btinfo->functions.empty ())
+	      {
+		std::vector<btrace_insn> &insns
+		  = btinfo->functions.back ().insn;
+		for (auto insn = insns.rbegin (); insn != insns.rend ();
+		     ++insn)
+		  {
+		    switch (insn->iclass)
+		    {
+		    case BTRACE_INSN_AUX:
+		      continue;
+
+		    case BTRACE_INSN_OTHER:
+		    case BTRACE_INSN_CALL:
+		    case BTRACE_INSN_RETURN:
+		    case BTRACE_INSN_JUMP:
+		      pc = insn->pc;
+		      break;
+		    /* No default to rely on compiler warnings.  */
+		    }
+		    break;
+		  }
+	      }
+
+	    if (pc == 0)
+	      warning (_("Failed to determine the PC for ptwrite."));
+
+	    if (btinfo->ptw_callback_fun != nullptr)
+	      ptw_string
+		= btinfo->ptw_callback_fun (event.variant.ptwrite.payload,
+					    pc, btinfo->ptw_context);
+
+	    if (ptw_string.has_value () && (*ptw_string).empty ())
+	      continue;
+
+	    if (!ptw_string.has_value ())
+	      *ptw_string = hex_string (event.variant.ptwrite.payload);
+
+	    handle_pt_aux_insn (btinfo, bfun, *ptw_string, pc);
+
+	    break;
+	  }
+#endif /* defined (HAVE_STRUCT_PT_EVENT_VARIANT_PTWRITE) */
 	}
     }
 #endif /* defined (HAVE_PT_INSN_EVENT) */
diff --git a/gdb/doc/python.texi b/gdb/doc/python.texi
index 83e8c60..bb1f205 100644
--- a/gdb/doc/python.texi
+++ b/gdb/doc/python.texi
@@ -8224,6 +8224,7 @@ registering objfile-specific pretty-printers and frame-filters.
 * gdb.printing::       Building and registering pretty-printers.
 * gdb.types::          Utilities for working with types.
 * gdb.prompt::         Utilities for prompt value substitution.
+* gdb.ptwrite::        Utilities for PTWRITE filter registration.
 @end menu
 
 @node gdb.printing
@@ -8414,3 +8415,153 @@ substitute_prompt ("frame: \f, args: \p@{print frame-arguments@}")
 "frame: main, args: scalars"
 @end smallexample
 @end table
+
+@node gdb.ptwrite
+@subsubsection gdb.ptwrite
+@cindex gdb.ptwrite
+
+This module provides additional functionality for recording programs that
+make use of the @code{PTWRITE} instruction.  @code{PTWRITE} is a x86
+instruction that allows to write values into the Intel Processor Trace
+(@pxref{Process Record and Replay}).
+The @value{NGCC} intrinsics for it are:
+@smallexample
+void _ptwrite32 (unsigned int a)
+void _ptwrite64 (unsigned __int64 a)
+@end smallexample
+
+If an inferior uses the instruction, @value{GDBN} by default inserts the
+raw payload value as auxiliary information into the execution history.
+Auxiliary information is by default printed during
+@code{record instruction-history}, @code{record function-call-history},
+and all stepping commands, and is accessible in Python as a
+@code{RecordAuxiliary} object (@pxref{Recordings In Python}).
+
+@exdent Sample program:
+@smallexample
+@group
+#include <immintrin.h>
+
+void
+ptwrite64 (unsigned long long value)
+@{
+  _ptwrite64 (value);
+@}
+@end group
+
+@group
+int
+main (void)
+@{
+  ptwrite64 (0x42);
+  return 0; /* break here.  */
+@}
+@end group
+@end smallexample
+
+
+@exdent @value{GDBN} output after recording the sample program in pt format:
+@smallexample
+@group
+(gdb) record instruction-history 12,14
+12         0x0040074c <ptwrite64+16>:   ptwrite %rbx
+13           [0x42]
+14         0x00400751 <ptwrite64+21>:   mov -0x8(%rbp),%rbx
+(gdb) record function-call-history
+1       main
+2       ptwrite64
+          [0x42]
+3       main
+@end group
+@end smallexample
+
+The @code{gdb.ptwrite} module allows customizing the default output of
+@code{PTWRITE} auxiliary information.  A custom Python function can be
+registered as the @code{PTWRITE} filter function.  This function will be
+called with the @code{PTWRITE} payload and PC as arguments during trace
+decoding.  The function can return a string, which will be printed by
+@value{GDBN} during the aforementioned commands, or @code{None}, resulting
+in no output.  To register such a filter function, the user needs to
+provide a filter factory function, which returns a new filter function
+object to be called by @value{GDBN}.
+
+@findex gdb.ptwrite.register_filter_factory
+@defun register_filter_factory (filter_factory)
+Used to register the @code{PTWRITE} filter factory.  This filter factory can
+be any callable object that accepts one argument, the current thread as
+a @code{gdb.InferiorThread}.
+It can return None or a callable.  This callable is the @code{PTWRITE} filter
+function for the specified thread.  If @code{None} is returned by the factory
+function, the default auxiliary information will be printed.
+@end defun
+
+@findex gdb.ptwrite.get_filter
+@defun get_filter ()
+Return the currently active @code{PTWRITE} filter function.
+@end defun
+
+An example:
+
+@smallexample
+@group
+(gdb) python-interactive
+>>> class my_filter():
+...    def __init__(self):
+...        self.var = 0
+...    def __call__(self, payload, ip):
+...        self.var += 1
+...        return f"counter: @{self.var@}, ip: @{ip:#x@}"
+...
+>>> def my_filter_factory(thread):
+...    if thread.global_num == 1:
+...        return my_filter()
+...    else:
+...        return None
+...
+>>> import gdb.ptwrite
+>>> gdb.ptwrite.register_filter_factory(my_filter_factory)
+>>>
+@end group
+
+@group
+(gdb) record function-call-history 59,64
+59      pthread_create@@GLIBC_2.2.5
+60      job()
+61      task(void*)
+62      ptwrite64(unsigned long)
+          [counter: 1, ip: 0x401156]
+63      task(void*)
+64      ptwrite32(unsigned int)
+          [counter: 2, ip: 0x40116c]
+@end group
+
+@group
+(gdb) info threads
+* 1    Thread 0x7ffff7fd8740 (LWP 25796) "ptw_threads" task ()
+    at bin/ptwrite/ptw_threads.c:45
+  2    Thread 0x7ffff6eb8700 (LWP 25797) "ptw_threads" task ()
+    at bin/ptwrite/ptw_threads.c:45
+@end group
+
+@group
+(gdb) thread 2
+[Switching to thread 2 (Thread 0x7ffff6eb8700 (LWP 25797))]
+#0  task (arg=0x0) at ptwrite_threads.c:45
+45        return NULL;
+@end group
+
+@group
+(gdb) record function-call-history 10,14
+10    start_thread
+11    task(void*)
+12    ptwrite64(unsigned long)
+        [0x42]
+13    task(void*)
+14    ptwrite32(unsigned int)
+        [0x43]
+@end group
+@end smallexample
+
+This @value{GDBN} feature is dependent on hardware and operating system
+support and requires the Intel Processor Trace decoder library in version
+2.0.0 or newer.
diff --git a/gdb/testsuite/gdb.btrace/i386-ptwrite.S b/gdb/testsuite/gdb.btrace/i386-ptwrite.S
new file mode 100644
index 0000000..5c649cf
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/i386-ptwrite.S
@@ -0,0 +1,550 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2024 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, see <http://www.gnu.org/licenses/>.
+
+
+   This file has been generated using gcc version 10.3.1 20210422
+   (Red Hat 10.3.1-1):
+   gcc -S -dA -g -m32 -mptwrite ptwrite.c -o i386-ptwrite.S.  */
+
+
+	.file	"ptwrite.c"
+	.text
+.Ltext0:
+	.globl	ptwrite1
+	.type	ptwrite1, @function
+ptwrite1:
+.LFB4021:
+	.file 1 "ptwrite.c"
+	# ptwrite.c:22:1
+	.loc 1 22 1
+	.cfi_startproc
+# BLOCK 2 seq:0
+# PRED: ENTRY (FALLTHRU)
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$16, %esp
+	# ptwrite.c:23:3
+	.loc 1 23 3
+	movl	8(%ebp), %eax
+	movl	%eax, -4(%ebp)
+.LBB6:
+.LBB7:
+	.file 2 "/usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h"
+	# /usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h:307:3
+	.loc 2 307 3
+	movl	-4(%ebp), %eax
+	ptwrite	%eax
+	# /usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h:308:1
+	.loc 2 308 1
+	nop
+.LBE7:
+.LBE6:
+	# ptwrite.c:24:1
+	.loc 1 24 1
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+# SUCC: EXIT [always]
+	ret
+	.cfi_endproc
+.LFE4021:
+	.size	ptwrite1, .-ptwrite1
+	.globl	ptwrite2
+	.type	ptwrite2, @function
+ptwrite2:
+.LFB4022:
+	# ptwrite.c:28:1
+	.loc 1 28 1
+	.cfi_startproc
+# BLOCK 2 seq:0
+# PRED: ENTRY (FALLTHRU)
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$16, %esp
+	# ptwrite.c:29:3
+	.loc 1 29 3
+	movl	8(%ebp), %eax
+	movl	%eax, -4(%ebp)
+.LBB8:
+.LBB9:
+	# /usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h:307:3
+	.loc 2 307 3
+	movl	-4(%ebp), %eax
+	ptwrite	%eax
+	# /usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h:308:1
+	.loc 2 308 1
+	nop
+.LBE9:
+.LBE8:
+	# ptwrite.c:30:1
+	.loc 1 30 1
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+# SUCC: EXIT [always]
+	ret
+	.cfi_endproc
+.LFE4022:
+	.size	ptwrite2, .-ptwrite2
+	.globl	main
+	.type	main, @function
+main:
+.LFB4023:
+	# ptwrite.c:34:1
+	.loc 1 34 1
+	.cfi_startproc
+# BLOCK 2 seq:0
+# PRED: ENTRY (FALLTHRU)
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	# ptwrite.c:35:3
+	.loc 1 35 3
+	pushl	$66
+	call	ptwrite1
+	addl	$4, %esp
+	# ptwrite.c:36:3
+	.loc 1 36 3
+	pushl	$67
+	call	ptwrite2
+	addl	$4, %esp
+	# ptwrite.c:38:10
+	.loc 1 38 10
+	movl	$0, %eax
+	# ptwrite.c:39:1
+	.loc 1 39 1
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+# SUCC: EXIT [always]
+	ret
+	.cfi_endproc
+.LFE4023:
+	.size	main, .-main
+.Letext0:
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x129	# Length of Compilation Unit Info
+	.value	0x4	# DWARF version number
+	.long	.Ldebug_abbrev0	# Offset Into Abbrev. Section
+	.byte	0x4	# Pointer Size (in bytes)
+	.uleb128 0x1	# (DIE (0xb) DW_TAG_compile_unit)
+	.long	.LASF15	# DW_AT_producer: "GNU C17 10.3.1 20210422 (Red Hat 10.3.1-1) -m32 -mptwrite -mtune=generic -march=i686 -g"
+	.byte	0xc	# DW_AT_language
+	.long	.LASF16	# DW_AT_name: "ptwrite.c"
+	.long	.LASF17	# DW_AT_comp_dir: "gdb/gdb/testsuite/gdb.btrace"
+	.long	.Ltext0	# DW_AT_low_pc
+	.long	.Letext0-.Ltext0	# DW_AT_high_pc
+	.long	.Ldebug_line0	# DW_AT_stmt_list
+	.uleb128 0x2	# (DIE (0x25) DW_TAG_base_type)
+	.byte	0x4	# DW_AT_byte_size
+	.byte	0x5	# DW_AT_encoding
+	.ascii "int\0"	# DW_AT_name
+	.uleb128 0x3	# (DIE (0x2c) DW_TAG_base_type)
+	.byte	0x2	# DW_AT_byte_size
+	.byte	0x5	# DW_AT_encoding
+	.long	.LASF0	# DW_AT_name: "short int"
+	.uleb128 0x3	# (DIE (0x33) DW_TAG_base_type)
+	.byte	0x1	# DW_AT_byte_size
+	.byte	0x6	# DW_AT_encoding
+	.long	.LASF1	# DW_AT_name: "char"
+	.uleb128 0x3	# (DIE (0x3a) DW_TAG_base_type)
+	.byte	0x8	# DW_AT_byte_size
+	.byte	0x5	# DW_AT_encoding
+	.long	.LASF2	# DW_AT_name: "long long int"
+	.uleb128 0x3	# (DIE (0x41) DW_TAG_base_type)
+	.byte	0x4	# DW_AT_byte_size
+	.byte	0x4	# DW_AT_encoding
+	.long	.LASF3	# DW_AT_name: "float"
+	.uleb128 0x3	# (DIE (0x48) DW_TAG_base_type)
+	.byte	0x4	# DW_AT_byte_size
+	.byte	0x7	# DW_AT_encoding
+	.long	.LASF4	# DW_AT_name: "unsigned int"
+	.uleb128 0x3	# (DIE (0x4f) DW_TAG_base_type)
+	.byte	0x4	# DW_AT_byte_size
+	.byte	0x5	# DW_AT_encoding
+	.long	.LASF5	# DW_AT_name: "long int"
+	.uleb128 0x3	# (DIE (0x56) DW_TAG_base_type)
+	.byte	0x1	# DW_AT_byte_size
+	.byte	0x8	# DW_AT_encoding
+	.long	.LASF6	# DW_AT_name: "unsigned char"
+	.uleb128 0x3	# (DIE (0x5d) DW_TAG_base_type)
+	.byte	0x2	# DW_AT_byte_size
+	.byte	0x7	# DW_AT_encoding
+	.long	.LASF7	# DW_AT_name: "short unsigned int"
+	.uleb128 0x3	# (DIE (0x64) DW_TAG_base_type)
+	.byte	0x4	# DW_AT_byte_size
+	.byte	0x7	# DW_AT_encoding
+	.long	.LASF8	# DW_AT_name: "long unsigned int"
+	.uleb128 0x3	# (DIE (0x6b) DW_TAG_base_type)
+	.byte	0x1	# DW_AT_byte_size
+	.byte	0x6	# DW_AT_encoding
+	.long	.LASF9	# DW_AT_name: "signed char"
+	.uleb128 0x3	# (DIE (0x72) DW_TAG_base_type)
+	.byte	0x8	# DW_AT_byte_size
+	.byte	0x7	# DW_AT_encoding
+	.long	.LASF10	# DW_AT_name: "long long unsigned int"
+	.uleb128 0x3	# (DIE (0x79) DW_TAG_base_type)
+	.byte	0x8	# DW_AT_byte_size
+	.byte	0x4	# DW_AT_encoding
+	.long	.LASF11	# DW_AT_name: "double"
+	.uleb128 0x4	# (DIE (0x80) DW_TAG_subprogram)
+			# DW_AT_external
+	.long	.LASF18	# DW_AT_name: "main"
+	.byte	0x1	# DW_AT_decl_file (ptwrite.c)
+	.byte	0x21	# DW_AT_decl_line
+	.byte	0x1	# DW_AT_decl_column
+			# DW_AT_prototyped
+	.long	0x25	# DW_AT_type
+	.long	.LFB4023	# DW_AT_low_pc
+	.long	.LFE4023-.LFB4023	# DW_AT_high_pc
+	.uleb128 0x1	# DW_AT_frame_base
+	.byte	0x9c	# DW_OP_call_frame_cfa
+			# DW_AT_GNU_all_tail_call_sites
+	.uleb128 0x5	# (DIE (0x96) DW_TAG_subprogram)
+			# DW_AT_external
+	.long	.LASF12	# DW_AT_name: "ptwrite2"
+	.byte	0x1	# DW_AT_decl_file (ptwrite.c)
+	.byte	0x1b	# DW_AT_decl_line
+	.byte	0x1	# DW_AT_decl_column
+			# DW_AT_prototyped
+	.long	.LFB4022	# DW_AT_low_pc
+	.long	.LFE4022-.LFB4022	# DW_AT_high_pc
+	.uleb128 0x1	# DW_AT_frame_base
+	.byte	0x9c	# DW_OP_call_frame_cfa
+			# DW_AT_GNU_all_call_sites
+	.long	0xd5	# DW_AT_sibling
+	.uleb128 0x6	# (DIE (0xac) DW_TAG_formal_parameter)
+	.long	.LASF14	# DW_AT_name: "value"
+	.byte	0x1	# DW_AT_decl_file (ptwrite.c)
+	.byte	0x1b	# DW_AT_decl_line
+	.byte	0xf	# DW_AT_decl_column
+	.long	0x25	# DW_AT_type
+	.uleb128 0x2	# DW_AT_location
+	.byte	0x91	# DW_OP_fbreg
+	.sleb128 0
+	.uleb128 0x7	# (DIE (0xbb) DW_TAG_inlined_subroutine)
+	.long	0x114	# DW_AT_abstract_origin
+	.long	.LBB8	# DW_AT_low_pc
+	.long	.LBE8-.LBB8	# DW_AT_high_pc
+	.byte	0x1	# DW_AT_call_file (ptwrite.c)
+	.byte	0x1d	# DW_AT_call_line
+	.byte	0x3	# DW_AT_call_column
+	.uleb128 0x8	# (DIE (0xcb) DW_TAG_formal_parameter)
+	.long	0x11e	# DW_AT_abstract_origin
+	.uleb128 0x2	# DW_AT_location
+	.byte	0x91	# DW_OP_fbreg
+	.sleb128 -12
+	.byte	0	# end of children of DIE 0xbb
+	.byte	0	# end of children of DIE 0x96
+	.uleb128 0x5	# (DIE (0xd5) DW_TAG_subprogram)
+			# DW_AT_external
+	.long	.LASF13	# DW_AT_name: "ptwrite1"
+	.byte	0x1	# DW_AT_decl_file (ptwrite.c)
+	.byte	0x15	# DW_AT_decl_line
+	.byte	0x1	# DW_AT_decl_column
+			# DW_AT_prototyped
+	.long	.LFB4021	# DW_AT_low_pc
+	.long	.LFE4021-.LFB4021	# DW_AT_high_pc
+	.uleb128 0x1	# DW_AT_frame_base
+	.byte	0x9c	# DW_OP_call_frame_cfa
+			# DW_AT_GNU_all_call_sites
+	.long	0x114	# DW_AT_sibling
+	.uleb128 0x6	# (DIE (0xeb) DW_TAG_formal_parameter)
+	.long	.LASF14	# DW_AT_name: "value"
+	.byte	0x1	# DW_AT_decl_file (ptwrite.c)
+	.byte	0x15	# DW_AT_decl_line
+	.byte	0xf	# DW_AT_decl_column
+	.long	0x25	# DW_AT_type
+	.uleb128 0x2	# DW_AT_location
+	.byte	0x91	# DW_OP_fbreg
+	.sleb128 0
+	.uleb128 0x7	# (DIE (0xfa) DW_TAG_inlined_subroutine)
+	.long	0x114	# DW_AT_abstract_origin
+	.long	.LBB6	# DW_AT_low_pc
+	.long	.LBE6-.LBB6	# DW_AT_high_pc
+	.byte	0x1	# DW_AT_call_file (ptwrite.c)
+	.byte	0x17	# DW_AT_call_line
+	.byte	0x3	# DW_AT_call_column
+	.uleb128 0x8	# (DIE (0x10a) DW_TAG_formal_parameter)
+	.long	0x11e	# DW_AT_abstract_origin
+	.uleb128 0x2	# DW_AT_location
+	.byte	0x91	# DW_OP_fbreg
+	.sleb128 -12
+	.byte	0	# end of children of DIE 0xfa
+	.byte	0	# end of children of DIE 0xd5
+	.uleb128 0x9	# (DIE (0x114) DW_TAG_subprogram)
+			# DW_AT_external
+	.long	.LASF19	# DW_AT_name: "_ptwrite32"
+	.byte	0x2	# DW_AT_decl_file (/usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h)
+	.value	0x131	# DW_AT_decl_line
+	.byte	0x1	# DW_AT_decl_column
+			# DW_AT_prototyped
+	.byte	0x3	# DW_AT_inline
+			# DW_AT_artificial
+	.uleb128 0xa	# (DIE (0x11e) DW_TAG_formal_parameter)
+	.ascii "__B\0"	# DW_AT_name
+	.byte	0x2	# DW_AT_decl_file (/usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h)
+	.value	0x131	# DW_AT_decl_line
+	.byte	0x16	# DW_AT_decl_column
+	.long	0x48	# DW_AT_type
+	.byte	0	# end of children of DIE 0x114
+	.byte	0	# end of children of DIE 0xb
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1	# (abbrev code)
+	.uleb128 0x11	# (TAG: DW_TAG_compile_unit)
+	.byte	0x1	# DW_children_yes
+	.uleb128 0x25	# (DW_AT_producer)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x13	# (DW_AT_language)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x1b	# (DW_AT_comp_dir)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x11	# (DW_AT_low_pc)
+	.uleb128 0x1	# (DW_FORM_addr)
+	.uleb128 0x12	# (DW_AT_high_pc)
+	.uleb128 0x6	# (DW_FORM_data4)
+	.uleb128 0x10	# (DW_AT_stmt_list)
+	.uleb128 0x17	# (DW_FORM_sec_offset)
+	.byte	0
+	.byte	0
+	.uleb128 0x2	# (abbrev code)
+	.uleb128 0x24	# (TAG: DW_TAG_base_type)
+	.byte	0	# DW_children_no
+	.uleb128 0xb	# (DW_AT_byte_size)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3e	# (DW_AT_encoding)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0x8	# (DW_FORM_string)
+	.byte	0
+	.byte	0
+	.uleb128 0x3	# (abbrev code)
+	.uleb128 0x24	# (TAG: DW_TAG_base_type)
+	.byte	0	# DW_children_no
+	.uleb128 0xb	# (DW_AT_byte_size)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3e	# (DW_AT_encoding)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.byte	0
+	.byte	0
+	.uleb128 0x4	# (abbrev code)
+	.uleb128 0x2e	# (TAG: DW_TAG_subprogram)
+	.byte	0	# DW_children_no
+	.uleb128 0x3f	# (DW_AT_external)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x3a	# (DW_AT_decl_file)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3b	# (DW_AT_decl_line)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x39	# (DW_AT_decl_column)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x27	# (DW_AT_prototyped)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x49	# (DW_AT_type)
+	.uleb128 0x13	# (DW_FORM_ref4)
+	.uleb128 0x11	# (DW_AT_low_pc)
+	.uleb128 0x1	# (DW_FORM_addr)
+	.uleb128 0x12	# (DW_AT_high_pc)
+	.uleb128 0x6	# (DW_FORM_data4)
+	.uleb128 0x40	# (DW_AT_frame_base)
+	.uleb128 0x18	# (DW_FORM_exprloc)
+	.uleb128 0x2116	# (DW_AT_GNU_all_tail_call_sites)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.byte	0
+	.byte	0
+	.uleb128 0x5	# (abbrev code)
+	.uleb128 0x2e	# (TAG: DW_TAG_subprogram)
+	.byte	0x1	# DW_children_yes
+	.uleb128 0x3f	# (DW_AT_external)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x3a	# (DW_AT_decl_file)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3b	# (DW_AT_decl_line)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x39	# (DW_AT_decl_column)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x27	# (DW_AT_prototyped)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x11	# (DW_AT_low_pc)
+	.uleb128 0x1	# (DW_FORM_addr)
+	.uleb128 0x12	# (DW_AT_high_pc)
+	.uleb128 0x6	# (DW_FORM_data4)
+	.uleb128 0x40	# (DW_AT_frame_base)
+	.uleb128 0x18	# (DW_FORM_exprloc)
+	.uleb128 0x2117	# (DW_AT_GNU_all_call_sites)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x1	# (DW_AT_sibling)
+	.uleb128 0x13	# (DW_FORM_ref4)
+	.byte	0
+	.byte	0
+	.uleb128 0x6	# (abbrev code)
+	.uleb128 0x5	# (TAG: DW_TAG_formal_parameter)
+	.byte	0	# DW_children_no
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x3a	# (DW_AT_decl_file)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3b	# (DW_AT_decl_line)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x39	# (DW_AT_decl_column)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x49	# (DW_AT_type)
+	.uleb128 0x13	# (DW_FORM_ref4)
+	.uleb128 0x2	# (DW_AT_location)
+	.uleb128 0x18	# (DW_FORM_exprloc)
+	.byte	0
+	.byte	0
+	.uleb128 0x7	# (abbrev code)
+	.uleb128 0x1d	# (TAG: DW_TAG_inlined_subroutine)
+	.byte	0x1	# DW_children_yes
+	.uleb128 0x31	# (DW_AT_abstract_origin)
+	.uleb128 0x13	# (DW_FORM_ref4)
+	.uleb128 0x11	# (DW_AT_low_pc)
+	.uleb128 0x1	# (DW_FORM_addr)
+	.uleb128 0x12	# (DW_AT_high_pc)
+	.uleb128 0x6	# (DW_FORM_data4)
+	.uleb128 0x58	# (DW_AT_call_file)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x59	# (DW_AT_call_line)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x57	# (DW_AT_call_column)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.byte	0
+	.byte	0
+	.uleb128 0x8	# (abbrev code)
+	.uleb128 0x5	# (TAG: DW_TAG_formal_parameter)
+	.byte	0	# DW_children_no
+	.uleb128 0x31	# (DW_AT_abstract_origin)
+	.uleb128 0x13	# (DW_FORM_ref4)
+	.uleb128 0x2	# (DW_AT_location)
+	.uleb128 0x18	# (DW_FORM_exprloc)
+	.byte	0
+	.byte	0
+	.uleb128 0x9	# (abbrev code)
+	.uleb128 0x2e	# (TAG: DW_TAG_subprogram)
+	.byte	0x1	# DW_children_yes
+	.uleb128 0x3f	# (DW_AT_external)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x3a	# (DW_AT_decl_file)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3b	# (DW_AT_decl_line)
+	.uleb128 0x5	# (DW_FORM_data2)
+	.uleb128 0x39	# (DW_AT_decl_column)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x27	# (DW_AT_prototyped)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x20	# (DW_AT_inline)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x34	# (DW_AT_artificial)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.byte	0
+	.byte	0
+	.uleb128 0xa	# (abbrev code)
+	.uleb128 0x5	# (TAG: DW_TAG_formal_parameter)
+	.byte	0	# DW_children_no
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0x8	# (DW_FORM_string)
+	.uleb128 0x3a	# (DW_AT_decl_file)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3b	# (DW_AT_decl_line)
+	.uleb128 0x5	# (DW_FORM_data2)
+	.uleb128 0x39	# (DW_AT_decl_column)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x49	# (DW_AT_type)
+	.uleb128 0x13	# (DW_FORM_ref4)
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x1c	# Length of Address Ranges Info
+	.value	0x2	# DWARF aranges version
+	.long	.Ldebug_info0	# Offset of Compilation Unit Info
+	.byte	0x4	# Size of Address
+	.byte	0	# Size of Segment Descriptor
+	.value	0	# Pad to 8 byte boundary
+	.value	0
+	.long	.Ltext0	# Address
+	.long	.Letext0-.Ltext0	# Length
+	.long	0
+	.long	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF2:
+	.string	"long long int"
+.LASF14:
+	.string	"value"
+.LASF19:
+	.string	"_ptwrite32"
+.LASF4:
+	.string	"unsigned int"
+.LASF17:
+	.string	"gdb/gdb/testsuite/gdb.btrace"
+.LASF18:
+	.string	"main"
+.LASF16:
+	.string	"ptwrite.c"
+.LASF8:
+	.string	"long unsigned int"
+.LASF10:
+	.string	"long long unsigned int"
+.LASF13:
+	.string	"ptwrite1"
+.LASF12:
+	.string	"ptwrite2"
+.LASF6:
+	.string	"unsigned char"
+.LASF1:
+	.string	"char"
+.LASF5:
+	.string	"long int"
+.LASF15:
+	.string	"GNU C17 10.3.1 20210422 (Red Hat 10.3.1-1) -m32 -mptwrite -mtune=generic -march=i686 -g"
+.LASF11:
+	.string	"double"
+.LASF7:
+	.string	"short unsigned int"
+.LASF9:
+	.string	"signed char"
+.LASF3:
+	.string	"float"
+.LASF0:
+	.string	"short int"
+	.ident	"GCC: (GNU) 10.3.1 20210422 (Red Hat 10.3.1-1)"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/gdb/testsuite/gdb.btrace/ptwrite.c b/gdb/testsuite/gdb.btrace/ptwrite.c
new file mode 100644
index 0000000..e10b885
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/ptwrite.c
@@ -0,0 +1,39 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2024 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, see <http://www.gnu.org/licenses/>.  */
+
+#include <immintrin.h>
+
+void
+ptwrite1 (int value)
+{
+  _ptwrite32 (value);
+}
+
+void
+ptwrite2 (int value)
+{
+  _ptwrite32 (value);
+}
+
+int
+main (void)
+{
+  ptwrite1 (0x42);
+  ptwrite2 (0x43);
+
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.btrace/ptwrite.exp b/gdb/testsuite/gdb.btrace/ptwrite.exp
new file mode 100644
index 0000000..0970d31
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/ptwrite.exp
@@ -0,0 +1,201 @@
+# This testcase is part of GDB, the GNU debugger.
+#
+# Copyright 2024 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, see <http://www.gnu.org/licenses/>.
+
+load_lib gdb-python.exp
+
+require allow_btrace_ptw_tests allow_python_tests
+
+set opts {}
+
+if [info exists COMPILE] {
+    # make check RUNTESTFLAGS="gdb.btrace/ptwrite.exp COMPILE=1"
+    standard_testfile ptwrite.c
+    lappend opts debug additional_flags=-mptwrite
+} elseif {[istarget "i?86-*-*"] || [istarget "x86_64-*-*"]} {
+    if {[is_amd64_regs_target]} {
+	standard_testfile x86_64-ptwrite.S
+    } else {
+	standard_testfile i386-ptwrite.S
+    }
+} else {
+    unsupported "target architecture not supported"
+    return -1
+}
+
+if [prepare_for_testing "failed to prepare" $testfile $srcfile $opts] {
+    return -1
+}
+
+if { ![runto_main] } {
+    untested "failed to run to main"
+    return -1
+}
+
+### 1. Default testrun
+
+# Setup recording
+gdb_test_no_output "set record instruction-history-size unlimited"
+gdb_test_no_output "record btrace pt"
+gdb_test "next 2" ".*"
+
+with_test_prefix "Default" {
+    # Test record instruction-history
+    gdb_test "record instruction-history 1" [multi_line \
+	".*\[0-9\]+\t   $hex <ptwrite1\\+\[0-9\]+>:\tptwrite %\[a-z\]+" \
+	"\[0-9\]+\t     \\\[0x42\\\]" \
+	".*\[0-9\]+\t   $hex <ptwrite2\\+\[0-9\]+>:\tptwrite %\[a-z\]+" \
+	"\[0-9\]+\t     \\\[0x43\\\].*" \
+	]
+
+    gdb_test "record instruction-history /a 1" [multi_line \
+	".*\[0-9\]+\t   $hex <ptwrite1\\+\[0-9\]+>:\tptwrite %\[a-z\]+" \
+	".*\[0-9\]+\t   $hex <ptwrite2\\+\[0-9\]+>:\tptwrite %\[a-z\]+.*" \
+	]
+
+    # Test function call history
+    gdb_test "record function-call-history 1,4" [multi_line \
+	"1\tmain" \
+	"2\tptwrite1" \
+	"\t  \\\[0x42\\\]" \
+	"3\tmain" \
+	"4\tptwrite2" \
+	"\t  \\\[0x43\\\]" \
+	]
+
+    gdb_test "record function-call-history /a 1,4" [multi_line \
+	"1\tmain" \
+	"2\tptwrite1" \
+	"3\tmain" \
+	"4\tptwrite2" \
+	]
+}
+
+# Test payload printing during stepping
+with_test_prefix "Stepping" {
+    gdb_test "record goto 10" "Can't go to an auxiliary instruction\."
+    gdb_test "record goto 9" ".*ptwrite.* at .*"
+    gdb_test "stepi" ".*\\\[0x42\\\].*"
+    gdb_test "reverse-stepi" ".*\\\[0x42\\\].*"
+    gdb_test "continue" [multi_line \
+	    ".*\\\[0x42\\\]" \
+	    "\\\[0x43\\\].*" \
+	    ]
+    gdb_test "reverse-continue" [multi_line \
+	    ".*\\\[0x43\\\]" \
+	    "\\\[0x42\\\].*" \
+	    ]
+}
+
+# Test auxiliary type in python
+gdb_test_multiline "auxiliary type in python" \
+    "python" "" \
+    "h = gdb.current_recording().instruction_history" "" \
+    "for insn in h:" "" \
+    "    if hasattr(insn, 'decoded'):" "" \
+    "        print(insn.decoded.decode())" "" \
+    "    elif hasattr(insn, 'data'):" "" \
+    "        print(insn.data)" "" \
+    "end" \
+    [multi_line \
+	".*mov    -0x4\\\(%(e|r)bp\\\),%(e|r)ax" \
+	"ptwrite %eax" \
+	"0x42" \
+	"nop.*" \
+	"mov    -0x4\\\(%(e|r)bp\\\),%(e|r)ax" \
+	"ptwrite %eax" \
+	"0x43" \
+	"nop.*"
+    ]
+
+
+### 2. Test filter registration
+### 2.1 Custom filter
+with_test_prefix "Custom" {
+    gdb_test_multiline "register filter in python" \
+	"python" "" \
+	"def my_filter(payload, ip):" "" \
+	"    if  payload == 66:" "" \
+	"        return \"payload: {0}, ip: {1:#x}\".format(payload, ip)" "" \
+	"    else:" "" \
+	"        return None" "" \
+	"def factory(thread): return my_filter" "" \
+	"import gdb.ptwrite" "" \
+	"gdb.ptwrite.register_filter_factory(factory)" "" \
+	"end" ""
+
+    gdb_test "record instruction-history 1" [multi_line \
+	".*\[0-9\]+\t   $hex <ptwrite1\\+\[0-9\]+>:\tptwrite %\[a-z\]+" \
+	"\[0-9\]+\t     \\\[payload: 66, ip: $hex\\\]" \
+	".*\[0-9\]+\t   $hex <ptwrite2\\+\[0-9\]+>:\tptwrite %\[a-z\]+" \
+	"\[0-9\]+\t   $hex <ptwrite2\\+\[0-9\]+>:.*" \
+	]
+}
+
+### 2.2 None as filter. This resets the default behaviour.
+with_test_prefix "None" {
+    gdb_test_multiline "register filter in python" \
+	"python" "" \
+	"import gdb.ptwrite" "" \
+	"gdb.ptwrite.register_filter_factory(None)" "" \
+	"end" ""
+
+    gdb_test "record instruction-history 1" [multi_line \
+	".*\[0-9\]+\t   $hex <ptwrite1\\+\[0-9\]+>:\tptwrite %\[a-z\]+" \
+	"\[0-9\]+\t     \\\[0x42\\\]" \
+	".*\[0-9\]+\t   $hex <ptwrite2\\+\[0-9\]+>:\tptwrite %\[a-z\]+" \
+	"\[0-9\]+\t     \\\[0x43\\\].*" \
+	]
+}
+
+### 2.3 Lambdas as filter
+with_test_prefix "Lambdas" {
+    gdb_test_multiline "register filter in python" \
+	"python" "" \
+	"import gdb.ptwrite" "" \
+	"lambda_filter = lambda payload, ip: \"{}\".format(payload + 2)" "" \
+	"gdb.ptwrite.register_filter_factory(lambda thread : lambda_filter)" "" \
+	"end" ""
+
+    gdb_test "record instruction-history 1" [multi_line \
+	".*\[0-9\]+\t   $hex <ptwrite1\\+\[0-9\]+>:\tptwrite %\[a-z\]+" \
+	"\[0-9\]+\t     \\\[68\\\]" \
+	".*\[0-9\]+\t   $hex <ptwrite2\\+\[0-9\]+>:\tptwrite %\[a-z\]+" \
+	"\[0-9\]+\t     \\\[69\\\].*" \
+	] "Lambdas: record instruction-history 1"
+}
+
+### 2.4 Functors as filter
+with_test_prefix "Functors" {
+    gdb_test_multiline "register filter in python" \
+	"python" "" \
+	"import gdb.ptwrite" "" \
+	"class foobar(object):" "" \
+	"    def __init__(self):" "" \
+	"        self.variable = 0" "" \
+	"    def __call__(self, payload, ip):" "" \
+	"        self.variable += 1" "" \
+	"        return \"{}, {}\".format(self.variable, payload)" "" \
+	"gdb.ptwrite.register_filter_factory(lambda thread : foobar())" "" \
+	"end" ""
+
+    gdb_test "record instruction-history 1" [multi_line \
+	".*\[0-9\]+\t   $hex <ptwrite1\\+\[0-9\]+>:\tptwrite %\[a-z\]+" \
+	"\[0-9\]+\t     \\\[1, 66\\\]" \
+	".*\[0-9\]+\t   $hex <ptwrite2\\+\[0-9\]+>:\tptwrite %\[a-z\]+" \
+	"\[0-9\]+\t     \\\[2, 67\\\].*" \
+	] "Functors: record instruction-history 1"
+}
diff --git a/gdb/testsuite/gdb.btrace/x86_64-ptwrite.S b/gdb/testsuite/gdb.btrace/x86_64-ptwrite.S
new file mode 100644
index 0000000..be4d204
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/x86_64-ptwrite.S
@@ -0,0 +1,544 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2024 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, see <http://www.gnu.org/licenses/>.
+
+
+   This file has been generated using gcc version 10.3.1 20210422
+   (Red Hat 10.3.1-1):
+   gcc -S -dA -g -mptwrite ptwrite.c -o x86_64-ptwrite.S.  */
+
+	.file	"ptwrite.c"
+	.text
+.Ltext0:
+	.globl	ptwrite1
+	.type	ptwrite1, @function
+ptwrite1:
+.LFB4096:
+	.file 1 "ptwrite.c"
+	# ptwrite.c:22:1
+	.loc 1 22 1
+	.cfi_startproc
+# BLOCK 2 seq:0
+# PRED: ENTRY (FALLTHRU)
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset 6, -16
+	movq	%rsp, %rbp
+	.cfi_def_cfa_register 6
+	movl	%edi, -20(%rbp)
+	# ptwrite.c:23:3
+	.loc 1 23 3
+	movl	-20(%rbp), %eax
+	movl	%eax, -4(%rbp)
+.LBB6:
+.LBB7:
+	.file 2 "/usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h"
+	# /usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h:307:3
+	.loc 2 307 3
+	movl	-4(%rbp), %eax
+	ptwrite	%eax
+	# /usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h:308:1
+	.loc 2 308 1
+	nop
+.LBE7:
+.LBE6:
+	# ptwrite.c:24:1
+	.loc 1 24 1
+	nop
+	popq	%rbp
+	.cfi_def_cfa 7, 8
+# SUCC: EXIT [always]
+	ret
+	.cfi_endproc
+.LFE4096:
+	.size	ptwrite1, .-ptwrite1
+	.globl	ptwrite2
+	.type	ptwrite2, @function
+ptwrite2:
+.LFB4097:
+	# ptwrite.c:28:1
+	.loc 1 28 1
+	.cfi_startproc
+# BLOCK 2 seq:0
+# PRED: ENTRY (FALLTHRU)
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset 6, -16
+	movq	%rsp, %rbp
+	.cfi_def_cfa_register 6
+	movl	%edi, -20(%rbp)
+	# ptwrite.c:29:3
+	.loc 1 29 3
+	movl	-20(%rbp), %eax
+	movl	%eax, -4(%rbp)
+.LBB8:
+.LBB9:
+	# /usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h:307:3
+	.loc 2 307 3
+	movl	-4(%rbp), %eax
+	ptwrite	%eax
+	# /usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h:308:1
+	.loc 2 308 1
+	nop
+.LBE9:
+.LBE8:
+	# ptwrite.c:30:1
+	.loc 1 30 1
+	nop
+	popq	%rbp
+	.cfi_def_cfa 7, 8
+# SUCC: EXIT [always]
+	ret
+	.cfi_endproc
+.LFE4097:
+	.size	ptwrite2, .-ptwrite2
+	.globl	main
+	.type	main, @function
+main:
+.LFB4098:
+	# ptwrite.c:34:1
+	.loc 1 34 1
+	.cfi_startproc
+# BLOCK 2 seq:0
+# PRED: ENTRY (FALLTHRU)
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset 6, -16
+	movq	%rsp, %rbp
+	.cfi_def_cfa_register 6
+	# ptwrite.c:35:3
+	.loc 1 35 3
+	movl	$66, %edi
+	call	ptwrite1
+	# ptwrite.c:36:3
+	.loc 1 36 3
+	movl	$67, %edi
+	call	ptwrite2
+	# ptwrite.c:38:10
+	.loc 1 38 10
+	movl	$0, %eax
+	# ptwrite.c:39:1
+	.loc 1 39 1
+	popq	%rbp
+	.cfi_def_cfa 7, 8
+# SUCC: EXIT [always]
+	ret
+	.cfi_endproc
+.LFE4098:
+	.size	main, .-main
+.Letext0:
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x159	# Length of Compilation Unit Info
+	.value	0x4	# DWARF version number
+	.long	.Ldebug_abbrev0	# Offset Into Abbrev. Section
+	.byte	0x8	# Pointer Size (in bytes)
+	.uleb128 0x1	# (DIE (0xb) DW_TAG_compile_unit)
+	.long	.LASF15	# DW_AT_producer: "GNU C17 10.3.1 20210422 (Red Hat 10.3.1-1) -mptwrite -mtune=generic -march=x86-64 -g"
+	.byte	0xc	# DW_AT_language
+	.long	.LASF16	# DW_AT_name: "ptwrite.c"
+	.long	.LASF17	# DW_AT_comp_dir: "gdb/gdb/testsuite/gdb.btrace"
+	.quad	.Ltext0	# DW_AT_low_pc
+	.quad	.Letext0-.Ltext0	# DW_AT_high_pc
+	.long	.Ldebug_line0	# DW_AT_stmt_list
+	.uleb128 0x2	# (DIE (0x2d) DW_TAG_base_type)
+	.byte	0x4	# DW_AT_byte_size
+	.byte	0x5	# DW_AT_encoding
+	.ascii "int\0"	# DW_AT_name
+	.uleb128 0x3	# (DIE (0x34) DW_TAG_base_type)
+	.byte	0x2	# DW_AT_byte_size
+	.byte	0x5	# DW_AT_encoding
+	.long	.LASF0	# DW_AT_name: "short int"
+	.uleb128 0x3	# (DIE (0x3b) DW_TAG_base_type)
+	.byte	0x1	# DW_AT_byte_size
+	.byte	0x6	# DW_AT_encoding
+	.long	.LASF1	# DW_AT_name: "char"
+	.uleb128 0x3	# (DIE (0x42) DW_TAG_base_type)
+	.byte	0x8	# DW_AT_byte_size
+	.byte	0x5	# DW_AT_encoding
+	.long	.LASF2	# DW_AT_name: "long long int"
+	.uleb128 0x3	# (DIE (0x49) DW_TAG_base_type)
+	.byte	0x4	# DW_AT_byte_size
+	.byte	0x4	# DW_AT_encoding
+	.long	.LASF3	# DW_AT_name: "float"
+	.uleb128 0x3	# (DIE (0x50) DW_TAG_base_type)
+	.byte	0x8	# DW_AT_byte_size
+	.byte	0x7	# DW_AT_encoding
+	.long	.LASF4	# DW_AT_name: "long unsigned int"
+	.uleb128 0x3	# (DIE (0x57) DW_TAG_base_type)
+	.byte	0x8	# DW_AT_byte_size
+	.byte	0x5	# DW_AT_encoding
+	.long	.LASF5	# DW_AT_name: "long int"
+	.uleb128 0x3	# (DIE (0x5e) DW_TAG_base_type)
+	.byte	0x1	# DW_AT_byte_size
+	.byte	0x8	# DW_AT_encoding
+	.long	.LASF6	# DW_AT_name: "unsigned char"
+	.uleb128 0x3	# (DIE (0x65) DW_TAG_base_type)
+	.byte	0x2	# DW_AT_byte_size
+	.byte	0x7	# DW_AT_encoding
+	.long	.LASF7	# DW_AT_name: "short unsigned int"
+	.uleb128 0x3	# (DIE (0x6c) DW_TAG_base_type)
+	.byte	0x4	# DW_AT_byte_size
+	.byte	0x7	# DW_AT_encoding
+	.long	.LASF8	# DW_AT_name: "unsigned int"
+	.uleb128 0x3	# (DIE (0x73) DW_TAG_base_type)
+	.byte	0x1	# DW_AT_byte_size
+	.byte	0x6	# DW_AT_encoding
+	.long	.LASF9	# DW_AT_name: "signed char"
+	.uleb128 0x3	# (DIE (0x7a) DW_TAG_base_type)
+	.byte	0x8	# DW_AT_byte_size
+	.byte	0x7	# DW_AT_encoding
+	.long	.LASF10	# DW_AT_name: "long long unsigned int"
+	.uleb128 0x3	# (DIE (0x81) DW_TAG_base_type)
+	.byte	0x8	# DW_AT_byte_size
+	.byte	0x4	# DW_AT_encoding
+	.long	.LASF11	# DW_AT_name: "double"
+	.uleb128 0x4	# (DIE (0x88) DW_TAG_subprogram)
+			# DW_AT_external
+	.long	.LASF18	# DW_AT_name: "main"
+	.byte	0x1	# DW_AT_decl_file (ptwrite.c)
+	.byte	0x21	# DW_AT_decl_line
+	.byte	0x1	# DW_AT_decl_column
+			# DW_AT_prototyped
+	.long	0x2d	# DW_AT_type
+	.quad	.LFB4098	# DW_AT_low_pc
+	.quad	.LFE4098-.LFB4098	# DW_AT_high_pc
+	.uleb128 0x1	# DW_AT_frame_base
+	.byte	0x9c	# DW_OP_call_frame_cfa
+			# DW_AT_GNU_all_tail_call_sites
+	.uleb128 0x5	# (DIE (0xa6) DW_TAG_subprogram)
+			# DW_AT_external
+	.long	.LASF12	# DW_AT_name: "ptwrite2"
+	.byte	0x1	# DW_AT_decl_file (ptwrite.c)
+	.byte	0x1b	# DW_AT_decl_line
+	.byte	0x1	# DW_AT_decl_column
+			# DW_AT_prototyped
+	.quad	.LFB4097	# DW_AT_low_pc
+	.quad	.LFE4097-.LFB4097	# DW_AT_high_pc
+	.uleb128 0x1	# DW_AT_frame_base
+	.byte	0x9c	# DW_OP_call_frame_cfa
+			# DW_AT_GNU_all_call_sites
+	.long	0xf5	# DW_AT_sibling
+	.uleb128 0x6	# (DIE (0xc4) DW_TAG_formal_parameter)
+	.long	.LASF14	# DW_AT_name: "value"
+	.byte	0x1	# DW_AT_decl_file (ptwrite.c)
+	.byte	0x1b	# DW_AT_decl_line
+	.byte	0xf	# DW_AT_decl_column
+	.long	0x2d	# DW_AT_type
+	.uleb128 0x2	# DW_AT_location
+	.byte	0x91	# DW_OP_fbreg
+	.sleb128 -36
+	.uleb128 0x7	# (DIE (0xd3) DW_TAG_inlined_subroutine)
+	.long	0x144	# DW_AT_abstract_origin
+	.quad	.LBB8	# DW_AT_low_pc
+	.quad	.LBE8-.LBB8	# DW_AT_high_pc
+	.byte	0x1	# DW_AT_call_file (ptwrite.c)
+	.byte	0x1d	# DW_AT_call_line
+	.byte	0x3	# DW_AT_call_column
+	.uleb128 0x8	# (DIE (0xeb) DW_TAG_formal_parameter)
+	.long	0x14e	# DW_AT_abstract_origin
+	.uleb128 0x2	# DW_AT_location
+	.byte	0x91	# DW_OP_fbreg
+	.sleb128 -20
+	.byte	0	# end of children of DIE 0xd3
+	.byte	0	# end of children of DIE 0xa6
+	.uleb128 0x5	# (DIE (0xf5) DW_TAG_subprogram)
+			# DW_AT_external
+	.long	.LASF13	# DW_AT_name: "ptwrite1"
+	.byte	0x1	# DW_AT_decl_file (ptwrite.c)
+	.byte	0x15	# DW_AT_decl_line
+	.byte	0x1	# DW_AT_decl_column
+			# DW_AT_prototyped
+	.quad	.LFB4096	# DW_AT_low_pc
+	.quad	.LFE4096-.LFB4096	# DW_AT_high_pc
+	.uleb128 0x1	# DW_AT_frame_base
+	.byte	0x9c	# DW_OP_call_frame_cfa
+			# DW_AT_GNU_all_call_sites
+	.long	0x144	# DW_AT_sibling
+	.uleb128 0x6	# (DIE (0x113) DW_TAG_formal_parameter)
+	.long	.LASF14	# DW_AT_name: "value"
+	.byte	0x1	# DW_AT_decl_file (ptwrite.c)
+	.byte	0x15	# DW_AT_decl_line
+	.byte	0xf	# DW_AT_decl_column
+	.long	0x2d	# DW_AT_type
+	.uleb128 0x2	# DW_AT_location
+	.byte	0x91	# DW_OP_fbreg
+	.sleb128 -36
+	.uleb128 0x7	# (DIE (0x122) DW_TAG_inlined_subroutine)
+	.long	0x144	# DW_AT_abstract_origin
+	.quad	.LBB6	# DW_AT_low_pc
+	.quad	.LBE6-.LBB6	# DW_AT_high_pc
+	.byte	0x1	# DW_AT_call_file (ptwrite.c)
+	.byte	0x17	# DW_AT_call_line
+	.byte	0x3	# DW_AT_call_column
+	.uleb128 0x8	# (DIE (0x13a) DW_TAG_formal_parameter)
+	.long	0x14e	# DW_AT_abstract_origin
+	.uleb128 0x2	# DW_AT_location
+	.byte	0x91	# DW_OP_fbreg
+	.sleb128 -20
+	.byte	0	# end of children of DIE 0x122
+	.byte	0	# end of children of DIE 0xf5
+	.uleb128 0x9	# (DIE (0x144) DW_TAG_subprogram)
+			# DW_AT_external
+	.long	.LASF19	# DW_AT_name: "_ptwrite32"
+	.byte	0x2	# DW_AT_decl_file (/usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h)
+	.value	0x131	# DW_AT_decl_line
+	.byte	0x1	# DW_AT_decl_column
+			# DW_AT_prototyped
+	.byte	0x3	# DW_AT_inline
+			# DW_AT_artificial
+	.uleb128 0xa	# (DIE (0x14e) DW_TAG_formal_parameter)
+	.ascii "__B\0"	# DW_AT_name
+	.byte	0x2	# DW_AT_decl_file (/usr/lib/gcc/x86_64-redhat-linux/10/include/immintrin.h)
+	.value	0x131	# DW_AT_decl_line
+	.byte	0x16	# DW_AT_decl_column
+	.long	0x6c	# DW_AT_type
+	.byte	0	# end of children of DIE 0x144
+	.byte	0	# end of children of DIE 0xb
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1	# (abbrev code)
+	.uleb128 0x11	# (TAG: DW_TAG_compile_unit)
+	.byte	0x1	# DW_children_yes
+	.uleb128 0x25	# (DW_AT_producer)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x13	# (DW_AT_language)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x1b	# (DW_AT_comp_dir)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x11	# (DW_AT_low_pc)
+	.uleb128 0x1	# (DW_FORM_addr)
+	.uleb128 0x12	# (DW_AT_high_pc)
+	.uleb128 0x7	# (DW_FORM_data8)
+	.uleb128 0x10	# (DW_AT_stmt_list)
+	.uleb128 0x17	# (DW_FORM_sec_offset)
+	.byte	0
+	.byte	0
+	.uleb128 0x2	# (abbrev code)
+	.uleb128 0x24	# (TAG: DW_TAG_base_type)
+	.byte	0	# DW_children_no
+	.uleb128 0xb	# (DW_AT_byte_size)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3e	# (DW_AT_encoding)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0x8	# (DW_FORM_string)
+	.byte	0
+	.byte	0
+	.uleb128 0x3	# (abbrev code)
+	.uleb128 0x24	# (TAG: DW_TAG_base_type)
+	.byte	0	# DW_children_no
+	.uleb128 0xb	# (DW_AT_byte_size)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3e	# (DW_AT_encoding)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.byte	0
+	.byte	0
+	.uleb128 0x4	# (abbrev code)
+	.uleb128 0x2e	# (TAG: DW_TAG_subprogram)
+	.byte	0	# DW_children_no
+	.uleb128 0x3f	# (DW_AT_external)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x3a	# (DW_AT_decl_file)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3b	# (DW_AT_decl_line)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x39	# (DW_AT_decl_column)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x27	# (DW_AT_prototyped)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x49	# (DW_AT_type)
+	.uleb128 0x13	# (DW_FORM_ref4)
+	.uleb128 0x11	# (DW_AT_low_pc)
+	.uleb128 0x1	# (DW_FORM_addr)
+	.uleb128 0x12	# (DW_AT_high_pc)
+	.uleb128 0x7	# (DW_FORM_data8)
+	.uleb128 0x40	# (DW_AT_frame_base)
+	.uleb128 0x18	# (DW_FORM_exprloc)
+	.uleb128 0x2116	# (DW_AT_GNU_all_tail_call_sites)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.byte	0
+	.byte	0
+	.uleb128 0x5	# (abbrev code)
+	.uleb128 0x2e	# (TAG: DW_TAG_subprogram)
+	.byte	0x1	# DW_children_yes
+	.uleb128 0x3f	# (DW_AT_external)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x3a	# (DW_AT_decl_file)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3b	# (DW_AT_decl_line)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x39	# (DW_AT_decl_column)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x27	# (DW_AT_prototyped)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x11	# (DW_AT_low_pc)
+	.uleb128 0x1	# (DW_FORM_addr)
+	.uleb128 0x12	# (DW_AT_high_pc)
+	.uleb128 0x7	# (DW_FORM_data8)
+	.uleb128 0x40	# (DW_AT_frame_base)
+	.uleb128 0x18	# (DW_FORM_exprloc)
+	.uleb128 0x2117	# (DW_AT_GNU_all_call_sites)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x1	# (DW_AT_sibling)
+	.uleb128 0x13	# (DW_FORM_ref4)
+	.byte	0
+	.byte	0
+	.uleb128 0x6	# (abbrev code)
+	.uleb128 0x5	# (TAG: DW_TAG_formal_parameter)
+	.byte	0	# DW_children_no
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x3a	# (DW_AT_decl_file)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3b	# (DW_AT_decl_line)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x39	# (DW_AT_decl_column)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x49	# (DW_AT_type)
+	.uleb128 0x13	# (DW_FORM_ref4)
+	.uleb128 0x2	# (DW_AT_location)
+	.uleb128 0x18	# (DW_FORM_exprloc)
+	.byte	0
+	.byte	0
+	.uleb128 0x7	# (abbrev code)
+	.uleb128 0x1d	# (TAG: DW_TAG_inlined_subroutine)
+	.byte	0x1	# DW_children_yes
+	.uleb128 0x31	# (DW_AT_abstract_origin)
+	.uleb128 0x13	# (DW_FORM_ref4)
+	.uleb128 0x11	# (DW_AT_low_pc)
+	.uleb128 0x1	# (DW_FORM_addr)
+	.uleb128 0x12	# (DW_AT_high_pc)
+	.uleb128 0x7	# (DW_FORM_data8)
+	.uleb128 0x58	# (DW_AT_call_file)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x59	# (DW_AT_call_line)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x57	# (DW_AT_call_column)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.byte	0
+	.byte	0
+	.uleb128 0x8	# (abbrev code)
+	.uleb128 0x5	# (TAG: DW_TAG_formal_parameter)
+	.byte	0	# DW_children_no
+	.uleb128 0x31	# (DW_AT_abstract_origin)
+	.uleb128 0x13	# (DW_FORM_ref4)
+	.uleb128 0x2	# (DW_AT_location)
+	.uleb128 0x18	# (DW_FORM_exprloc)
+	.byte	0
+	.byte	0
+	.uleb128 0x9	# (abbrev code)
+	.uleb128 0x2e	# (TAG: DW_TAG_subprogram)
+	.byte	0x1	# DW_children_yes
+	.uleb128 0x3f	# (DW_AT_external)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0xe	# (DW_FORM_strp)
+	.uleb128 0x3a	# (DW_AT_decl_file)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3b	# (DW_AT_decl_line)
+	.uleb128 0x5	# (DW_FORM_data2)
+	.uleb128 0x39	# (DW_AT_decl_column)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x27	# (DW_AT_prototyped)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.uleb128 0x20	# (DW_AT_inline)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x34	# (DW_AT_artificial)
+	.uleb128 0x19	# (DW_FORM_flag_present)
+	.byte	0
+	.byte	0
+	.uleb128 0xa	# (abbrev code)
+	.uleb128 0x5	# (TAG: DW_TAG_formal_parameter)
+	.byte	0	# DW_children_no
+	.uleb128 0x3	# (DW_AT_name)
+	.uleb128 0x8	# (DW_FORM_string)
+	.uleb128 0x3a	# (DW_AT_decl_file)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x3b	# (DW_AT_decl_line)
+	.uleb128 0x5	# (DW_FORM_data2)
+	.uleb128 0x39	# (DW_AT_decl_column)
+	.uleb128 0xb	# (DW_FORM_data1)
+	.uleb128 0x49	# (DW_AT_type)
+	.uleb128 0x13	# (DW_FORM_ref4)
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x2c	# Length of Address Ranges Info
+	.value	0x2	# DWARF aranges version
+	.long	.Ldebug_info0	# Offset of Compilation Unit Info
+	.byte	0x8	# Size of Address
+	.byte	0	# Size of Segment Descriptor
+	.value	0	# Pad to 16 byte boundary
+	.value	0
+	.quad	.Ltext0	# Address
+	.quad	.Letext0-.Ltext0	# Length
+	.quad	0
+	.quad	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF2:
+	.string	"long long int"
+.LASF14:
+	.string	"value"
+.LASF19:
+	.string	"_ptwrite32"
+.LASF8:
+	.string	"unsigned int"
+.LASF17:
+	.string	"gdb/gdb/testsuite/gdb.btrace"
+.LASF18:
+	.string	"main"
+.LASF16:
+	.string	"ptwrite.c"
+.LASF4:
+	.string	"long unsigned int"
+.LASF10:
+	.string	"long long unsigned int"
+.LASF15:
+	.string	"GNU C17 10.3.1 20210422 (Red Hat 10.3.1-1) -mptwrite -mtune=generic -march=x86-64 -g"
+.LASF13:
+	.string	"ptwrite1"
+.LASF12:
+	.string	"ptwrite2"
+.LASF6:
+	.string	"unsigned char"
+.LASF1:
+	.string	"char"
+.LASF5:
+	.string	"long int"
+.LASF11:
+	.string	"double"
+.LASF7:
+	.string	"short unsigned int"
+.LASF9:
+	.string	"signed char"
+.LASF3:
+	.string	"float"
+.LASF0:
+	.string	"short int"
+	.ident	"GCC: (GNU) 10.3.1 20210422 (Red Hat 10.3.1-1)"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index c4e322b..1c49b6a 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -4299,6 +4299,79 @@ gdb_caching_proc allow_btrace_pt_tests {} {
     return $allow_btrace_pt_tests
 }
 
+# Run a test on the target to see if it supports ptwrite instructions and
+# if GDB can decode ptwrite events.  Return 1 if so, 0 if it does not.
+
+gdb_caching_proc allow_btrace_ptw_tests {} {
+    global srcdir subdir gdb_prompt inferior_exited_re decimal
+
+    require allow_btrace_pt_tests
+    set me "allow_btrace_ptw_tests"
+
+    set src {
+	#include <immintrin.h>
+
+	int
+	main ()
+	{
+	  _ptwrite32 (0x42);
+	  return 0;
+	}
+    }
+
+    set compile_flags "additional_flags=-mptwrite"
+    if {![gdb_simple_compile $me $src executable $compile_flags]} {
+	return 0
+    }
+
+    gdb_exit
+    gdb_start
+    gdb_reinitialize_dir $srcdir/$subdir
+    gdb_load "$obj"
+    if ![runto_main] {
+	return 1
+    }
+
+    gdb_test_no_output "record btrace pt" "$me: record btrace pt"
+
+    set allow_btrace_ptw_tests 0
+    gdb_test_multiple "next" "$me: next" {
+	-re -wrap ".*Illegal instruction.*" {
+	    verbose -log "$me:  ptwrite instruction support not detected."
+	}
+	-re -wrap ".*$inferior_exited_re normally.*" {
+	    verbose -log "$me:  ptwrite support not detected."
+	}
+	-re -wrap "$decimal.*(at|in|return 0).*" {
+	    set allow_btrace_ptw_tests 1
+	}
+    }
+
+    if { $allow_btrace_ptw_tests == 1 } {
+	# Show the func-call-history to get the packet trace.
+	gdb_test "record function-call-history" ".*"
+
+	gdb_test_multiple "maintenance btrace packet-history 0,1000" \
+	    "$me: check decoding support" {
+	    -re  "ptw" {
+		verbose -log "$me:  ptwrite decoding support detected."
+		set allow_btrace_ptw_tests 1
+	    }
+	    -re -wrap "" {
+		verbose -log "$me:  ptwrite decoding support not detected."
+		set allow_btrace_ptw_tests 0
+	    }
+	}
+    }
+
+    gdb_exit
+    remote_file build delete $obj
+
+    verbose "$me:  returning $allow_btrace_ptw_tests" 2
+    return $allow_btrace_ptw_tests
+}
+
+
 # Run a test on the target to see if it supports Aarch64 SVE hardware.
 # Return 1 if so, 0 if it does not.  Note this causes a restart of GDB.