From: Luis Machado <luis.machado@arm.com>
To: <binutils@sourceware.org>
Subject: [PATCH] [aarch64] sme2: Teach binutils/BFD about the NT_ARM_ZT register set
Date: Fri, 30 Jun 2023 14:45:19 +0100 [thread overview]
Message-ID: <20230630134519.1237879-1-luis.machado@arm.com> (raw)
The Scalable Matrix Extension v2 (SME2) defines a new register, ZT0, that
the Linux Kernel handles through a new NT_ARM_ZT register set.
Teach binutils/BFD about it so that gdb can make use of it for reading
and writing core files. This also enables readelf/objdump to show the
correct identification for the NT_ARM_ZT register set.
Validated under Fast Models.
---
bfd/elf-bfd.h | 2 ++
bfd/elf.c | 37 +++++++++++++++++++++++++++++++++++++
binutils/readelf.c | 2 ++
include/elf/common.h | 2 ++
4 files changed, 43 insertions(+)
diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h
index 2a9eed7f9ee..0baee5acfa6 100644
--- a/bfd/elf-bfd.h
+++ b/bfd/elf-bfd.h
@@ -2943,6 +2943,8 @@ extern char *elfcore_write_aarch_ssve
(bfd *, char *, int *, const void *, int);
extern char *elfcore_write_aarch_za
(bfd *, char *, int *, const void *, int);
+extern char *elfcore_write_aarch_zt
+ (bfd *, char *, int *, const void *, int);
extern char *elfcore_write_arc_v2
(bfd *, char *, int *, const void *, int);
extern char *elfcore_write_riscv_csr
diff --git a/bfd/elf.c b/bfd/elf.c
index 2a097b02977..e8ab2546d91 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -10692,6 +10692,15 @@ elfcore_grok_aarch_za (bfd *abfd, Elf_Internal_Note *note)
return elfcore_make_note_pseudosection (abfd, ".reg-aarch-za", note);
}
+/* Convert NOTE into a bfd_section called ".reg-aarch-zt". Return TRUE if
+ successful, otherwise return FALSE. */
+
+static bool
+elfcore_grok_aarch_zt (bfd *abfd, Elf_Internal_Note *note)
+{
+ return elfcore_make_note_pseudosection (abfd, ".reg-aarch-zt", note);
+}
+
static bool
elfcore_grok_arc_v2 (bfd *abfd, Elf_Internal_Note *note)
{
@@ -11421,6 +11430,13 @@ elfcore_grok_note (bfd *abfd, Elf_Internal_Note *note)
else
return true;
+ case NT_ARM_ZT:
+ if (note->namesz == 6
+ && strcmp (note->namedata, "LINUX") == 0)
+ return elfcore_grok_aarch_zt (abfd, note);
+ else
+ return true;
+
case NT_GDB_TDESC:
if (note->namesz == 4
&& strcmp (note->namedata, "GDB") == 0)
@@ -13063,6 +13079,25 @@ elfcore_write_aarch_za (bfd *abfd,
size);
}
+/* Write the buffer of zt register values in aarch_zt (length SIZE) into
+ the note buffer BUF and update *BUFSIZ. ABFD is the bfd the note is being
+ written into. Return a pointer to the new start of the note buffer, to
+ replace BUF which may no longer be valid. */
+
+char *
+elfcore_write_aarch_zt (bfd *abfd,
+ char *buf,
+ int *bufsiz,
+ const void *aarch_zt,
+ int size)
+{
+ char *note_name = "LINUX";
+ return elfcore_write_note (abfd, buf, bufsiz,
+ note_name, NT_ARM_ZT,
+ aarch_zt,
+ size);
+}
+
char *
elfcore_write_arc_v2 (bfd *abfd,
char *buf,
@@ -13248,6 +13283,8 @@ elfcore_write_register_note (bfd *abfd,
return elfcore_write_aarch_ssve (abfd, buf, bufsiz, data, size);
if (strcmp (section, ".reg-aarch-za") == 0)
return elfcore_write_aarch_za (abfd, buf, bufsiz, data, size);
+ if (strcmp (section, ".reg-aarch-zt") == 0)
+ return elfcore_write_aarch_zt (abfd, buf, bufsiz, data, size);
if (strcmp (section, ".reg-arc-v2") == 0)
return elfcore_write_arc_v2 (abfd, buf, bufsiz, data, size);
if (strcmp (section, ".gdb-tdesc") == 0)
diff --git a/binutils/readelf.c b/binutils/readelf.c
index 97d72d0b95f..d1c7e5aa450 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -19654,6 +19654,8 @@ get_note_type (Filedata * filedata, unsigned e_type)
return _("NT_ARM_SSVE (AArch64 streaming SVE registers)");
case NT_ARM_ZA:
return _("NT_ARM_ZA (AArch64 SME ZA register)");
+ case NT_ARM_ZT:
+ return _("NT_ARM_ZT (AArch64 SME2 ZT registers)");
case NT_ARM_PAC_ENABLED_KEYS:
return _("NT_ARM_PAC_ENABLED_KEYS (AArch64 pointer authentication enabled keys)");
case NT_ARC_V2:
diff --git a/include/elf/common.h b/include/elf/common.h
index ffa6b60bd2b..932ea94e3ae 100644
--- a/include/elf/common.h
+++ b/include/elf/common.h
@@ -701,6 +701,8 @@
/* Note: name must be "LINUX". */
#define NT_ARM_ZA 0x40c /* AArch64 SME ZA register. */
/* Note: name must be "LINUX". */
+#define NT_ARM_ZT 0x40d /* AArch64 SME2 ZT registers. */
+ /* Note: name must be "LINUX". */
#define NT_ARC_V2 0x600 /* ARC HS accumulator/extra registers. */
/* note name must be "LINUX". */
#define NT_LARCH_CPUCFG 0xa00 /* LoongArch CPU config registers */
--
2.25.1
next reply other threads:[~2023-06-30 13:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-30 13:45 Luis Machado [this message]
2023-07-07 8:46 ` Nick Clifton
2023-07-07 8:57 ` Luis Machado
2023-08-21 13:25 ` Luis Machado
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230630134519.1237879-1-luis.machado@arm.com \
--to=luis.machado@arm.com \
--cc=binutils@sourceware.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).