From 2abf9ff11384a47dc456c138a8faf6b1469aac2b Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Tue, 23 Sep 2003 12:07:26 +0000
Subject: * sysdeps/i386/dl-machine.h (RTLD_START): Set __libc_stack_end before

	calling _dl_start, using GOTOFF access.

	* configure.in (libc_cv_z_execstack): New check.
	* configure: Regenerated.
	* config.make.in (have-z-execstack): New variable set by it.
	* elf/tst-execstack.c: New file.
	* elf/tst-execstack-mod.c: New file.
	* elf/tst-execstack-needed.c: New file.
	* elf/Makefile (tests-execstack-yes, modules-execstack-yes): New
	variables.
	(tests, modules-names): Conditionally include them.
	(distribute): Add tst-execstack-mod.c here.
	($(objpfx)tst-execstack, $(objpfx)tst-execstack.out): New targets.
	(LDFLAGS-tst-execstack, LDFLAGS-tst-execstack-mod): New variables.
	($(objpfx)tst-execstack-needed): New target.
	(LDFLAGS-tst-execstack-needed): New variable.

	* sysdeps/generic/ldsodefs.h (struct rtld_global): Add _dl_stack_flags
	and _dl_make_stack_executable_hook.  Declare _dl_make_stack_executable.
	* elf/rtld.c (_rtld_global): Add initializer for _dl_stack_flags.
	(dl_main): Reset _dl_stack_flags according to PT_GNU_STACK phdr.
	Initialize _dl_make_stack_executable_hook.
	* elf/dl-support.c: Define those new variables.
	(_dl_non_dynamic_init): Scan phdrs for PT_GNU_STACK.
	(_dl_phdr): Fix type.
	* elf/dl-load.c (_dl_map_object_from_fd): Grok PT_GNU_STACK phdr and
	enable execute permission for the stack if necessary.
	* sysdeps/generic/dl-execstack.c: New file.
	* elf/Makefile (dl-routines): Add it.
	* elf/Versions (ld: GLIBC_PRIVATE): Add _dl_make_stack_executable.
	* sysdeps/unix/sysv/linux/dl-execstack.c: New file.
---
 sysdeps/i386/dl-machine.h | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

(limited to 'sysdeps/i386')

diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h
index 34019b89bb..9e84e2c059 100644
--- a/sysdeps/i386/dl-machine.h
+++ b/sysdeps/i386/dl-machine.h
@@ -276,18 +276,17 @@ _dl_runtime_profile:\n\
 .globl _start\n\
 .globl _dl_start_user\n\
 _start:\n\
+	# Point %ebx at the GOT.\n\
+	call 0b\n\
+	addl $_GLOBAL_OFFSET_TABLE_, %ebx\n\
 	# Note that _dl_start gets the parameter in %eax.\n\
 	movl %esp, %eax\n\
+	# Store the highest stack address\n\
+	movl %eax, __libc_stack_end@GOTOFF(%ebx)\n\
 	call _dl_start\n\
 _dl_start_user:\n\
 	# Save the user entry point address in %edi.\n\
 	movl %eax, %edi\n\
-	# Point %ebx at the GOT.\n\
-	call 0b\n\
-	addl $_GLOBAL_OFFSET_TABLE_, %ebx\n\
-	# Store the highest stack address\n\
-	movl __libc_stack_end@GOT(%ebx), %eax\n\
-	movl %esp, (%eax)\n\
 	# See if we were run as a command with the executable file\n\
 	# name as an extra leading argument.\n\
 	movl _dl_skip_args@GOTOFF(%ebx), %eax\n\
-- 
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