From 1e8e527dd9718eaebe8417b73befb0c821b7b327 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Fri, 4 Aug 2017 12:59:35 -0700 Subject: i386: Support static PIE in start.S Since start.o may be compiled as PIC, we should check PIC instead of SHARED. Also avoid dynamic relocation against main in static PIE since _start is the entry point before the executable is relocated. * sysdeps/i386/start.S (_start): Check Check PIC instead of SHARED. Avoid dynamic relocation against main in static PIE. --- sysdeps/i386/start.S | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) (limited to 'sysdeps') diff --git a/sysdeps/i386/start.S b/sysdeps/i386/start.S index ccb1e2b..375a93c 100644 --- a/sysdeps/i386/start.S +++ b/sysdeps/i386/start.S @@ -81,7 +81,7 @@ _start: pushl %edx /* Push address of the shared library termination function. */ -#ifdef SHARED +#ifdef PIC /* Load PIC register. */ call 1f addl $_GLOBAL_OFFSET_TABLE_, %ebx @@ -95,7 +95,14 @@ _start: pushl %ecx /* Push second argument: argv. */ pushl %esi /* Push first argument: argc. */ +# ifdef SHARED pushl main@GOT(%ebx) +# else + /* Avoid relocation in static PIE since _start is called before + it is relocated. */ + leal main@GOTOFF(%ebx), %eax + pushl %eax +# endif /* Call the user's main function, and exit with its value. But let the libc call main. */ @@ -117,7 +124,7 @@ _start: hlt /* Crash if somehow `exit' does return. */ -#ifdef SHARED +#ifdef PIC 1: movl (%esp), %ebx ret #endif -- cgit v1.1