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2009-01-27 Kirill A. Shutemov <kirill@shutemov.name> 

* sysdeps/arm/elf/start.S (_start): Use position-independent code
	if SHARED.  Clear lr.
This commit is contained in:
Daniel Jacobowitz 2009-01-27 16:01:19 +00:00
parent 60acbff563
commit 856cb7775f
2 changed files with 44 additions and 9 deletions
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5
ChangeLog.arm
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@ -1,3 +1,8 @@
2009-01-27 Kirill A. Shutemov <kirill@shutemov.name>
* sysdeps/arm/elf/start.S (_start): Use position-independent code
if SHARED. Clear lr.
2009-01-27 Ryosei Takagi <ryosei@sm.sony.co.jp> 2009-01-27 Ryosei Takagi <ryosei@sm.sony.co.jp>
* sysdeps/unix/sysv/linux/arm/nptl/lowlevellock.h * sysdeps/unix/sysv/linux/arm/nptl/lowlevellock.h

48
sysdeps/arm/elf/start.S
View File

@ -1,5 +1,5 @@
/* Startup code for ARM & ELF /* Startup code for ARM & ELF
Copyright (C) 1995, 1996, 1997, 1998, 2001, 2002, 2005 Copyright (C) 1995, 1996, 1997, 1998, 2001, 2002, 2005, 2008
Free Software Foundation, Inc. Free Software Foundation, Inc.
This file is part of the GNU C Library. This file is part of the GNU C Library.
@ -67,11 +67,9 @@ _start:
/* Protect against unhandled exceptions. */ /* Protect against unhandled exceptions. */
.fnstart .fnstart
#endif #endif
/* Fetch address of fini */ /* Clear the frame pointer and link register since this is the outermost frame. */
ldr ip, =__libc_csu_fini
/* Clear the frame pointer since this is the outermost frame. */
mov fp, #0 mov fp, #0
mov lr, #0
/* Pop argc off the stack and save a pointer to argv */ /* Pop argc off the stack and save a pointer to argv */
ldr a2, [sp], #4 ldr a2, [sp], #4
@ -83,21 +81,53 @@ _start:
/* Push rtld_fini */ /* Push rtld_fini */
str a1, [sp, #-4]! str a1, [sp, #-4]!
#ifdef SHARED
ldr sl, .L_GOT
.L_GOT_OFF:
add sl, pc, sl
ldr ip, .L_GOT+4 /* __libc_csu_fini */
ldr ip, [sl, ip]
str ip, [sp, #-4]! /* Push __libc_csu_fini */
ldr a4, .L_GOT+8 /* __libc_csu_init */
ldr a4, [sl, a4]
ldr a1, .L_GOT+12 /* main */
ldr a1, [sl, a1]
/* __libc_start_main (main, argc, argv, init, fini, rtld_fini, stack_end) */
/* Let the libc call main and exit with its return code. */
bl __libc_start_main(PLT)
#else
/* Fetch address of __libc_csu_fini */
ldr ip, =__libc_csu_fini
/* Push __libc_csu_fini */
str ip, [sp, #-4]!
/* Set up the other arguments in registers */ /* Set up the other arguments in registers */
ldr a1, =main ldr a1, =main
ldr a4, =__libc_csu_init ldr a4, =__libc_csu_init
/* Push fini */
str ip, [sp, #-4]!
/* __libc_start_main (main, argc, argv, init, fini, rtld_fini, stack_end) */ /* __libc_start_main (main, argc, argv, init, fini, rtld_fini, stack_end) */
/* Let the libc call main and exit with its return code. */ /* Let the libc call main and exit with its return code. */
bl __libc_start_main bl __libc_start_main
#endif
/* should never get here....*/ /* should never get here....*/
bl abort bl abort
#ifdef SHARED
.L_GOT:
.word _GLOBAL_OFFSET_TABLE_-(.L_GOT_OFF+8)
.word __libc_csu_fini(GOT)
.word __libc_csu_init(GOT)
.word main(GOT)
#endif
#if !defined(__USING_SJLJ_EXCEPTIONS__) #if !defined(__USING_SJLJ_EXCEPTIONS__)
.cantunwind .cantunwind
.fnend .fnend