Commit 0d8c461a authored by Thomas Weißschuh's avatar Thomas Weißschuh Committed by Paul E. McKenney
Browse files

tools/nolibc: x86_64: add stackprotector support 



Enable the new stackprotector support for x86_64.

Signed-off-by: default avatarThomas Weißschuh <linux@weissschuh.net>
Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent ff221a6d

tools/include/nolibc/arch-x86_64.h

+5 −0
Original line number Diff line number Diff line
@@ -181,6 +181,8 @@ struct sys_stat_struct { 
char **environ __attribute__((weak));

const unsigned long *_auxv __attribute__((weak));



#define __ARCH_SUPPORTS_STACK_PROTECTOR



/* startup code */

/*

 * x86-64 System V ABI mandates:
@@ -191,6 +193,9 @@ const unsigned long *_auxv __attribute__((weak)); 
void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) _start(void)

{

	__asm__ volatile (

#ifdef NOLIBC_STACKPROTECTOR

		"call __stack_chk_init\n"   // initialize stack protector

#endif

		"pop %rdi\n"                // argc   (first arg, %rdi)

		"mov %rsp, %rsi\n"          // argv[] (second arg, %rsi)

		"lea 8(%rsi,%rdi,8),%rdx\n" // then a NULL then envp (third arg, %rdx)

tools/testing/selftests/nolibc/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -80,6 +80,8 @@ CFLAGS_STACKPROTECTOR = -DNOLIBC_STACKPROTECTOR \ 
			$(call cc-option,-mstack-protector-guard=global) \

			$(call cc-option,-fstack-protector-all)

CFLAGS_STKP_i386 = $(CFLAGS_STACKPROTECTOR)

CFLAGS_STKP_x86_64 = $(CFLAGS_STACKPROTECTOR)

CFLAGS_STKP_x86 = $(CFLAGS_STACKPROTECTOR)

CFLAGS_s390 = -m64

CFLAGS  ?= -Os -fno-ident -fno-asynchronous-unwind-tables \

		$(call cc-option,-fno-stack-protector) \