diff options
Diffstat (limited to 'libexec/rtld-elf/arm/rtld_start.S')
| -rw-r--r-- | libexec/rtld-elf/arm/rtld_start.S | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/libexec/rtld-elf/arm/rtld_start.S b/libexec/rtld-elf/arm/rtld_start.S new file mode 100644 index 000000000000..609a7d0603ed --- /dev/null +++ b/libexec/rtld-elf/arm/rtld_start.S @@ -0,0 +1,98 @@ +/* $NetBSD: rtld_start.S,v 1.7 2002/09/12 17:18:38 mycroft Exp $ */ + +/*- + * Copyright (c) 1998, 2002 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Matt Thomas and by Charles M. Hannum. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <machine/asm.h> + .text + .align 0 + .globl .rtld_start + .type .rtld_start,%function +.rtld_start: + mov r6, sp /* save the stack pointer */ + bic sp, sp, #7 /* align the stack pointer */ + sub sp, sp, #8 /* make room for obj_main & exit proc */ + mov r4, r0 /* save ps_strings */ + ldr sl, .L2 + ldr r5, .L2+4 + ldr r0, .L2+8 +.L1: + add sl, pc, sl + ldr r5, [sl, r5] + ldr r0, [sl, r0] + + sub r1, sl, r5 /* relocbase */ + add r0, r1, r0 /* &_DYNAMIC */ + bl _rtld_relocate_nonplt_self + mov r1, sp + add r2, sp, #4 + mov r0, r6 /* load the sp the kernel gave us */ + bl _rtld /* call the shared loader */ + mov r3, r0 /* save entry point */ + + ldr r2, [sp, #0] /* r2 = cleanup */ + ldr r1, [sp, #4] /* r1 = obj_main */ + mov sp, r6 /* restore stack */ + mov r0, r4 /* restore ps_strings */ + mov pc, r3 /* jump to the entry point */ +.L2: + .word _GLOBAL_OFFSET_TABLE_ - (.L1+8) + .word _GLOBAL_OFFSET_TABLE_(GOT) + .word _DYNAMIC(GOT) + + .align 0 + .globl _rtld_bind_start + .type _rtld_bind_start,%function +/* + * stack[0] = RA + * ip = &GOT[n+3] + * lr = &GOT[2] + */ +_rtld_bind_start: + stmdb sp!,{r0-r5,sl,fp} + + sub r1, ip, lr /* r1 = 4 * (n + 1) */ + sub r1, r1, #4 /* r1 = 4 * n */ + add r1, r1, r1 /* r1 = 8 * n */ + + ldr r0, [lr, #-4] /* get obj ptr from GOT[1] */ + mov r4, ip /* save GOT location */ + + mov r5, sp /* Save the stack pointer */ + bic sp, sp, #7 /* Align the stack pointer */ + bl _rtld_bind /* Call the binder */ + mov sp, r5 /* Restore the old stack pointer */ + + str r0, [r4] /* save address in GOT */ + mov ip, r0 /* save new address */ + + ldmia sp!,{r0-r5,sl,fp,lr} /* restore the stack */ + mov pc, ip /* jump to the new address */ + + .section .note.GNU-stack,"",%progbits |