AArch64: Add pauth core file section

Used for the AArch64 pointer authentication code mask registers in Arm v8.3-a.

NT_ARM_PAC_MASK matches the value in Linux include/uapi/linux/elf.h

include/ChangeLog:

	* elf/common.h (NT_ARM_PAC_MASK): Add define.

bfd/ChangeLog:

	* elf-bfd.h (elfcore_write_aarch_pauth): Add declaration.
	* elf.c (elfcore_grok_aarch_pauth): New function.
	(elfcore_grok_note): Check for NT_ARM_PAC_MASK.
	(elfcore_write_aarch_pauth): New function.
	(elfcore_write_register_note): Check for AArch64 pauth section.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 8183678..c10f1a4 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,11 @@
+2019-02-20  Alan Hayward  <alan.hayward@arm.com>
+
+       * elf-bfd.h (elfcore_write_aarch_pauth): Add declaration.
+       * elf.c (elfcore_grok_aarch_pauth): New function.
+       (elfcore_grok_note): Check for NT_ARM_PAC_MASK.
+       (elfcore_write_aarch_pauth): New function.
+       (elfcore_write_register_note): Check for AArch64 pauth section.
+
 2019-02-20  Alan Modra  <amodra@gmail.com>
 
        PR 24225

diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h
index 5741c60..56cddda 100644 (file)
--- a/bfd/elf-bfd.h
+++ b/bfd/elf-bfd.h
@@ -2634,6 +2634,8 @@ extern char *elfcore_write_aarch_hw_watch
   (bfd *, char *, int *, const void *, int);
 extern char *elfcore_write_aarch_sve
   (bfd *, char *, int *, const void *, int);
+extern char *elfcore_write_aarch_pauth
+  (bfd *, char *, int *, const void *, int);
 extern char *elfcore_write_lwpstatus
   (bfd *, char *, int *, long, int, const void *);
 extern char *elfcore_write_register_note

diff --git a/bfd/elf.c b/bfd/elf.c
index eb3e182..f16acaa 100644 (file)
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -9541,6 +9541,12 @@ elfcore_grok_aarch_sve (bfd *abfd, Elf_Internal_Note *note)
   return elfcore_make_note_pseudosection (abfd, ".reg-aarch-sve", note);
 }
 
+static bfd_boolean
+elfcore_grok_aarch_pauth (bfd *abfd, Elf_Internal_Note *note)
+{
+  return elfcore_make_note_pseudosection (abfd, ".reg-aarch-pauth", note);
+}
+
 #if defined (HAVE_PRPSINFO_T)
 typedef prpsinfo_t   elfcore_psinfo_t;
 #if defined (HAVE_PRPSINFO32_T)                /* Sparc64 cross Sparc32 */
@@ -10135,6 +10141,13 @@ elfcore_grok_note (bfd *abfd, Elf_Internal_Note *note)
       else
        return TRUE;
 
+    case NT_ARM_PAC_MASK:
+      if (note->namesz == 6
+         && strcmp (note->namedata, "LINUX") == 0)
+       return elfcore_grok_aarch_pauth (abfd, note);
+      else
+       return TRUE;
+
     case NT_PRPSINFO:
     case NT_PSINFO:
       if (bed->elf_backend_grok_psinfo)
@@ -11495,6 +11508,18 @@ elfcore_write_aarch_sve (bfd *abfd,
 }
 
 char *
+elfcore_write_aarch_pauth (bfd *abfd,
+                          char *buf,
+                          int *bufsiz,
+                          const void *aarch_pauth,
+                          int size)
+{
+  char *note_name = "LINUX";
+  return elfcore_write_note (abfd, buf, bufsiz,
+                            note_name, NT_ARM_PAC_MASK, aarch_pauth, size);
+}
+
+char *
 elfcore_write_register_note (bfd *abfd,
                             char *buf,
                             int *bufsiz,
@@ -11574,6 +11599,8 @@ elfcore_write_register_note (bfd *abfd,
     return elfcore_write_aarch_hw_watch (abfd, buf, bufsiz, data, size);
   if (strcmp (section, ".reg-aarch-sve") == 0)
     return elfcore_write_aarch_sve (abfd, buf, bufsiz, data, size);
+  if (strcmp (section, ".reg-aarch-pauth") == 0)
+    return elfcore_write_aarch_pauth (abfd, buf, bufsiz, data, size);
   return NULL;
 }
 

diff --git a/include/ChangeLog b/include/ChangeLog
index 7045bc9..6d6ec66 100644 (file)
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,7 @@
+2019-02-20  Alan Hayward  <alan.hayward@arm.com>
+
+       * elf/common.h (NT_ARM_PAC_MASK): Add define.
+
 2019-02-15  Saagar Jha  <saagar@saagarjha.com>
 
        * mach-o/loader.h: Use new OS names in comments.

diff --git a/include/elf/common.h b/include/elf/common.h
index 996acf9..e8faf67 100644 (file)
--- a/include/elf/common.h
+++ b/include/elf/common.h
@@ -650,6 +650,8 @@
                                        /*   note name must be "LINUX".  */
 #define NT_ARM_SVE     0x405           /* AArch SVE registers.  */
                                        /*   note name must be "LINUX".  */
+#define NT_ARM_PAC_MASK        0x406           /* AArch pointer authentication code masks */
+                                       /*   note name must be "LINUX".  */
 #define NT_SIGINFO     0x53494749      /* Fields of siginfo_t.  */
 #define NT_FILE                0x46494c45      /* Description of mapped files.  */