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[PATCH] Support several new ELF auxiliary vector types on FreeBSD.

John Baldwin jhb@FreeBSD.org
Tue Jul 7 21:30:30 GMT 2020 
FreeBSD's kernel recently added several ELF auxiliary vector entries
to describe the arguments passed to new executable images during
exec().  The AT_FREEBSD_ARGC and AT_FREEBSD_ARGV entries give the
length and address of the process argument array.  AT_FREEBSD_ENVC and
AT_FREEBSD_ENVV entries give the length and address of the initial
process environment.  AT_FREEBSD_PS_STRINGS gives the address of the
'struct ps_strings' object.

include/ChangeLog:

	* elf/common.h (AT_FREEBSD_ARGC, AT_FREEBSD_ARGV, AT_FREEBSD_ENVC)
	(AT_FREEBSD_ENVV, AT_FREEBSD_PS_STRINGS): Define.

gdb/ChangeLog:

	* fbsd-tdep.c (fbsd_print_auxv_entry): Handle AT_FREEBSD_ARGC,
	AT_FREEBSD_ARGV, AT_FREEBSD_ENVC, AT_FREEBSD_ENVV,
	AT_FREEBSD_PS_STRINGS.
---
 gdb/ChangeLog        | 6 ++++++
 gdb/fbsd-tdep.c      | 5 +++++
 include/ChangeLog    | 5 +++++
 include/elf/common.h | 5 +++++
 4 files changed, 21 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index c86d7e4647..07f6c7b657 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2020-07-07  John Baldwin  <jhb@FreeBSD.org>
+
+	* fbsd-tdep.c (fbsd_print_auxv_entry): Handle AT_FREEBSD_ARGC,
+	AT_FREEBSD_ARGV, AT_FREEBSD_ENVC, AT_FREEBSD_ENVV,
+	AT_FREEBSD_PS_STRINGS.
+
 2020-07-06  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	PR python/22748
diff --git a/gdb/fbsd-tdep.c b/gdb/fbsd-tdep.c
index acf787c706..557c5d3d73 100644
--- a/gdb/fbsd-tdep.c
+++ b/gdb/fbsd-tdep.c
@@ -1598,6 +1598,11 @@ fbsd_print_auxv_entry (struct gdbarch *gdbarch, struct ui_file *file,
       TAG (HWCAP, _("Machine-dependent CPU capability hints"), AUXV_FORMAT_HEX);
       TAG (HWCAP2, _("Extension of AT_HWCAP"), AUXV_FORMAT_HEX);
       TAG (BSDFLAGS, _("ELF BSD flags"), AUXV_FORMAT_HEX);
+      TAG (ARGC, _("Argument count"), AUXV_FORMAT_DEC);
+      TAG (ARGV, _("Argument vector"), AUXV_FORMAT_HEX);
+      TAG (ENVC, _("Environment count"), AUXV_FORMAT_DEC);
+      TAG (ENVV, _("Environment vector"), AUXV_FORMAT_HEX);
+      TAG (PS_STRINGS, _("Pointer to ps_strings"), AUXV_FORMAT_HEX);
     }
 
   fprint_auxv_entry (file, name, description, format, type, val);
diff --git a/include/ChangeLog b/include/ChangeLog
index 000dfe5034..ab2fae33ab 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,8 @@
+2020-07-07  John Baldwin  <jhb@FreeBSD.org>
+
+	* elf/common.h (AT_FREEBSD_ARGC, AT_FREEBSD_ARGV, AT_FREEBSD_ENVC)
+	(AT_FREEBSD_ENVV, AT_FREEBSD_PS_STRINGS): Define.
+
 2020-07-04  Nick Clifton  <nickc@redhat.com>
 
 	Binutils 2.35 branch created.
diff --git a/include/elf/common.h b/include/elf/common.h
index 4d94c4fd5b..88dd1c9983 100644
--- a/include/elf/common.h
+++ b/include/elf/common.h
@@ -1255,6 +1255,11 @@
 #define AT_FREEBSD_HWCAP        25      /* CPU feature flags. */
 #define AT_FREEBSD_HWCAP2       26      /* CPU feature flags 2. */
 #define AT_FREEBSD_BSDFLAGS     27      /* ELF BSD Flags. */
+#define AT_FREEBSD_ARGC         28      /* Argument count. */
+#define AT_FREEBSD_ARGV         29      /* Argument vector. */
+#define AT_FREEBSD_ENVC         30      /* Environment count. */
+#define AT_FREEBSD_ENVV         31      /* Environment vvector. */
+#define AT_FREEBSD_PS_STRINGS   32      /* struct ps_strings. */
 
 #define AT_SUN_UID      2000    /* Effective user ID.  */
 #define AT_SUN_RUID     2001    /* Real user ID.  */
-- 
2.25.1
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