diff --git a/gdb/NEWS b/gdb/NEWS
index feb3a37393a..295f2147def 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -3,6 +3,8 @@
 
 *** Changes since GDB 14
 
+* GDB now supports watchpoints for tagged data pointers on amd64.
+
 * The MPX commands "show/set mpx bound" have been deprecated, as Intel
   listed MPX as removed in 2019.
 
diff --git a/gdb/amd64-linux-tdep.c b/gdb/amd64-linux-tdep.c
index 9d560ac4fbf..94c62277623 100644
--- a/gdb/amd64-linux-tdep.c
+++ b/gdb/amd64-linux-tdep.c
@@ -41,6 +41,7 @@
 #include "arch/amd64.h"
 #include "target-descriptions.h"
 #include "expop.h"
+#include "inferior.h"
 
 /* The syscall's XML filename for i386.  */
 #define XML_SYSCALL_FILENAME_AMD64 "syscalls/amd64-linux.xml"
@@ -48,6 +49,10 @@
 #include "record-full.h"
 #include "linux-record.h"
 
+#include <sstream>
+
+#define DEFAULT_TAG_MASK 0xffffffffffffffffULL
+
 /* Mapping between the general-purpose registers in `struct user'
    format and GDB's register cache layout.  */
 
@@ -1794,6 +1799,65 @@ amd64_dtrace_parse_probe_argument (struct gdbarch *gdbarch,
     }
 }
 
+/* Extract the untagging mask based on the currently active linear address
+   masking (LAM) mode, which is stored in the /proc/<pid>/status file.
+   If we cannot extract the untag mask (for example, if we don't have
+   execution), we assume address tagging is not enabled and return the
+   DEFAULT_TAG_MASK.  */
+
+static CORE_ADDR
+amd64_linux_lam_untag_mask ()
+{
+  if (!target_has_execution ())
+    return DEFAULT_TAG_MASK;
+
+  inferior *inf = current_inferior ();
+  if (inf->fake_pid_p)
+    return DEFAULT_TAG_MASK;
+
+  /* Construct status file name and read the file's content.  */
+  std::string filename = string_printf ("/proc/%d/status", inf->pid);
+  gdb::unique_xmalloc_ptr<char> status_file
+    = target_fileio_read_stralloc (nullptr, filename.c_str ());
+
+  if (status_file == nullptr)
+    return DEFAULT_TAG_MASK;
+
+  /* Parse the status file line-by-line and look for the untag mask.  */
+  std::istringstream strm_status_file (status_file.get ());
+  std::string line;
+  const std::string untag_mask_str ("untag_mask:\t");
+  while (std::getline (strm_status_file, line))
+    {
+      const size_t found = line.find (untag_mask_str);
+      if (found != std::string::npos)
+	{
+	  const size_t tag_length = untag_mask_str.length();
+	  return std::strtoul (&line[found + tag_length], nullptr, 0);
+	}
+    }
+
+   return DEFAULT_TAG_MASK;
+}
+
+/* Adjust watchpoint address based on the tagging mode which is currently
+   enabled.  For now, linear address masking (LAM) is the only feature
+   which allows to store metadata in pointer values for amd64.  Thus, we
+   adjust the watchpoint address based on the currently active LAM mode
+   using the untag mask provided by the linux kernel.  Check each time for
+   a new mask, as LAM is enabled at runtime.  Also, the LAM configuration
+   may change when entering an enclave.  No untagging will be applied if
+   this function is called while we don't have execution.  */
+
+static CORE_ADDR
+amd64_linux_remove_non_addr_bits_wpt (gdbarch *gdbarch, CORE_ADDR addr)
+{
+  /* Clear insignificant bits of a target address using the untag mask.
+     The untag mask preserves the topmost bit, which distinguishes user space
+     from kernel space address.  */
+  return (addr & amd64_linux_lam_untag_mask ());
+}
+
 static void
 amd64_linux_init_abi_common(struct gdbarch_info info, struct gdbarch *gdbarch,
 			    int num_disp_step_buffers)
@@ -1848,6 +1912,9 @@ amd64_linux_init_abi_common(struct gdbarch_info info, struct gdbarch *gdbarch,
 
   set_gdbarch_get_siginfo_type (gdbarch, x86_linux_get_siginfo_type);
   set_gdbarch_report_signal_info (gdbarch, i386_linux_report_signal_info);
+
+  set_gdbarch_remove_non_addr_bits_wpt (gdbarch,
+					amd64_linux_remove_non_addr_bits_wpt);
 }
 
 static void
diff --git a/gdb/testsuite/gdb.arch/amd64-lam.c b/gdb/testsuite/gdb.arch/amd64-lam.c
new file mode 100755
index 00000000000..28786389a9a
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/amd64-lam.c
@@ -0,0 +1,49 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 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, see <http://www.gnu.org/licenses/>.  */
+
+#define _GNU_SOURCE
+#include <stdint.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/syscall.h>
+#include <assert.h>
+#include <errno.h>
+#include <asm/prctl.h>
+
+int
+main (int argc, char **argv)
+{
+  int i;
+  int* pi = &i;
+  int* pi_tagged;
+
+  /* Enable LAM 57.  */
+  errno = 0;
+  syscall (SYS_arch_prctl, ARCH_ENABLE_TAGGED_ADDR, 6);
+  assert_perror (errno);
+
+  /* Add tagging at bit 61.  */
+  pi_tagged = (int *) ((uintptr_t) pi | (1LL << 60));
+
+  i = 0; /* Breakpoint here.  */
+  *pi = 1;
+  *pi_tagged = 2;
+  *pi = 3;
+  *pi_tagged = 4;
+
+  return 0;
+}
diff --git a/gdb/testsuite/gdb.arch/amd64-lam.exp b/gdb/testsuite/gdb.arch/amd64-lam.exp
new file mode 100644
index 00000000000..8274c3adf97
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/amd64-lam.exp
@@ -0,0 +1,45 @@
+# Copyright 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, see <http://www.gnu.org/licenses/>.
+
+# Test Linear Address Masking (LAM) support.
+
+require allow_lam_tests
+
+standard_testfile amd64-lam.c
+
+# Test LAM 57.
+if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
+    return -1
+}
+
+if { ![runto_main] } {
+    return -1
+}
+
+gdb_breakpoint [gdb_get_line_number "Breakpoint here"]
+gdb_continue_to_breakpoint "Breakpoint here"
+
+# Test hw watchpoint for tagged and untagged address with hit on untagged
+# and tagged adress.
+foreach symbol {"pi" "pi_tagged"} {
+    gdb_test "watch *${symbol}"
+    gdb_test "continue" \
+	"Continuing\\..*Hardware watchpoint \[0-9\]+.*" \
+	"run until watchpoint on ${symbol}"
+    gdb_test "continue" \
+	"Continuing\\..*Hardware watchpoint \[0-9\]+.*" \
+	"run until watchpoint on ${symbol}, 2nd hit"
+    delete_breakpoints
+}
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index d48ea37c0cc..c7d15f82da1 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -9285,6 +9285,68 @@ gdb_caching_proc allow_ctf_tests {} {
 
     return $can_ctf
 }
+# Run a test on the target to see if it supports LAM 57.  Return 1 if so,
+# 0 if it does not.  Based on the arch_prctl() handle ARCH_ENABLE_TAGGED_ADDR
+# to enable LAM which fails if the hardware or the OS does not support LAM.
+
+gdb_caching_proc allow_lam_tests {} {
+    global gdb_prompt inferior_exited_re
+
+    set me "allow_lam_tests"
+    if { ![istarget "x86_64-*-*"] } {
+	verbose "$me:  target does not support LAM, returning 1" 2
+	return 0
+    }
+
+    # Compile a test program.
+    set src {
+      #define _GNU_SOURCE
+      #include <sys/syscall.h>
+      #include <assert.h>
+      #include <errno.h>
+      #include <asm/prctl.h>
+
+      int configure_lam ()
+      {
+	errno = 0;
+	syscall (SYS_arch_prctl, ARCH_ENABLE_TAGGED_ADDR, 6);
+	assert_perror (errno);
+	return errno;
+      }
+
+      int
+      main () { return configure_lam (); }
+    }
+
+    if {![gdb_simple_compile $me $src executable ""]} {
+	return 0
+    }
+    # No error message, compilation succeeded so now run it via gdb.
+
+    set allow_lam_tests 0
+    clean_restart $obj
+    gdb_run_cmd
+    gdb_expect {
+	-re ".*$inferior_exited_re with code.*${gdb_prompt} $" {
+	    verbose -log "$me:  LAM support not detected."
+	}
+	-re ".*Program received signal SIGABRT, Aborted.*${gdb_prompt} $" {
+	    verbose -log "$me:  LAM support not detected."
+	}
+	-re ".*$inferior_exited_re normally.*${gdb_prompt} $" {
+	    verbose -log "$me:  LAM support detected."
+	    set allow_lam_tests 1
+	}
+	default {
+	    warning "\n$me:  default case taken."
+	}
+    }
+    gdb_exit
+    remote_file build delete $obj
+
+    verbose "$me:  returning $allow_lam_tests" 2
+    return $allow_lam_tests
+}
 
 # Return 1 if compiler supports -gstatement-frontiers.  Otherwise,
 # return 0.
