[binutils-gdb] gdb: support rseq auxvs

[binutils-gdb] gdb: support rseq auxvs

[Simon Marchi]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=7a3bb62d82631ff042525b7115d9e03a7329e7be

commit 7a3bb62d82631ff042525b7115d9e03a7329e7be
Author: Ilya Leoshkevich <iii@linux.ibm.com>
Date:   Thu Jun 22 01:03:04 2023 +0200

    gdb: support rseq auxvs
    
    Linux kernel commit commit 317c8194e6ae ("rseq: Introduce feature size
    and alignment ELF auxiliary vector entries") introduced two new auxvs:
    AT_RSEQ_FEATURE_SIZE and AT_RSEQ_ALIGN.  Support them in GDB.  This
    fixes auxv.exp on kernels >= v6.3.
    
    Change-Id: I8966c4d5c73eb7b45de6d410a9b28a6628edad2e
    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30540
    Approved-By: Tom Tromey <tom@tromey.com>

Diff:
---
 gdb/auxv.c           | 4 ++++
 include/elf/common.h | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/gdb/auxv.c b/gdb/auxv.c
index 7e3efc54e4b..8cda0b687b4 100644
--- a/gdb/auxv.c
+++ b/gdb/auxv.c
@@ -495,6 +495,10 @@ default_print_auxv_entry (struct gdbarch *gdbarch, struct ui_file *file,
 	   AUXV_FORMAT_STR);
       TAG (AT_RANDOM, _("Address of 16 random bytes"), AUXV_FORMAT_HEX);
       TAG (AT_HWCAP2, _("Extension of AT_HWCAP"), AUXV_FORMAT_HEX);
+      TAG (AT_RSEQ_FEATURE_SIZE, _("rseq supported feature size"),
+	   AUXV_FORMAT_DEC);
+      TAG (AT_RSEQ_ALIGN, _("rseq allocation alignment"),
+	   AUXV_FORMAT_DEC);
       TAG (AT_EXECFN, _("File name of executable"), AUXV_FORMAT_STR);
       TAG (AT_SECURE, _("Boolean, was exec setuid-like?"), AUXV_FORMAT_DEC);
       TAG (AT_SYSINFO, _("Special system info/entry points"), AUXV_FORMAT_HEX);
diff --git a/include/elf/common.h b/include/elf/common.h
index 2edfb15efc7..244b13361e5 100644
--- a/include/elf/common.h
+++ b/include/elf/common.h
@@ -1377,6 +1377,8 @@
 					   may differ from AT_PLATFORM.  */
 #define AT_RANDOM	25		/* Address of 16 random bytes.  */
 #define AT_HWCAP2	26		/* Extension of AT_HWCAP.  */
+#define AT_RSEQ_FEATURE_SIZE	27	/* rseq supported feature size */
+#define AT_RSEQ_ALIGN	28		/* rseq allocation alignment */
 #define AT_EXECFN	31		/* Filename of executable.  */
 /* Pointer to the global system page used for system calls and other
    nice things.  */