130 lines
3.7 KiB
ArmAsm
130 lines
3.7 KiB
ArmAsm
|
/*-
|
||
|
|
* Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This software was developed by SRI International and the University of
|
||
|
|
* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
|
||
|
|
* ("CTSRD"), as part of the DARPA CRASH research programme.
|
||
|
|
*
|
||
|
|
* This software was developed by the University of Cambridge Computer
|
||
|
|
* Laboratory as part of the CTSRD Project, with support from the UK Higher
|
||
|
|
* Education Innovation Fund (HEIF).
|
||
|
|
*
|
||
|
|
* 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 AUTHOR 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 AUTHOR 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>
|
||
|
|
__FBSDID("$FreeBSD$");
|
||
|
|
|
||
|
|
/*
|
||
|
|
* func_ptr_type
|
||
|
|
* _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp)
|
||
|
|
*/
|
||
|
|
|
||
|
|
ENTRY(.rtld_start)
|
||
|
|
mv s0, a0 /* Put ps_strings in a callee-saved register */
|
||
|
|
mv s1, sp /* And the stack pointer */
|
||
|
|
|
||
|
|
addi sp, sp, -16 /* Make room for obj_main & exit proc */
|
||
|
|
|
||
|
|
mv a1, sp /* exit_proc */
|
||
|
|
addi a2, a1, 8 /* obj_main */
|
||
|
|
jal _rtld /* Call the loader */
|
||
|
|
mv t0, a0 /* Backup the entry point */
|
||
|
|
|
||
|
|
ld a2, 0(sp) /* Load cleanup */
|
||
|
|
ld a1, 8(sp) /* Load obj_main */
|
||
|
|
mv a0, s0 /* Restore ps_strings */
|
||
|
|
mv sp, s1 /* Restore the stack pointer */
|
||
|
|
jr t0 /* Jump to the entry point */
|
||
|
|
END(.rtld_start)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* t0 = obj pointer
|
||
|
|
* t1 = reloc offset
|
||
|
|
*/
|
||
|
|
ENTRY(_rtld_bind_start)
|
||
|
|
/* Save the arguments and ra */
|
||
|
|
addi sp, sp, -(8 * 25)
|
||
|
|
sd a0, (8 * 0)(sp)
|
||
|
|
sd a1, (8 * 1)(sp)
|
||
|
|
sd a2, (8 * 2)(sp)
|
||
|
|
sd a3, (8 * 3)(sp)
|
||
|
|
sd a4, (8 * 4)(sp)
|
||
|
|
sd a5, (8 * 5)(sp)
|
||
|
|
sd a6, (8 * 6)(sp)
|
||
|
|
sd a7, (8 * 7)(sp)
|
||
|
|
sd ra, (8 * 8)(sp)
|
||
|
|
#if 0
|
||
|
|
/* RISCVTODO VFP */
|
||
|
|
/* Save any floating-point arguments */
|
||
|
|
fsq fa0, (8 * 9)(sp)
|
||
|
|
fsq fa1, (8 * 11)(sp)
|
||
|
|
fsq fa2, (8 * 13)(sp)
|
||
|
|
fsq fa3, (8 * 15)(sp)
|
||
|
|
fsq fa4, (8 * 17)(sp)
|
||
|
|
fsq fa5, (8 * 19)(sp)
|
||
|
|
fsq fa6, (8 * 21)(sp)
|
||
|
|
fsq fa7, (8 * 23)(sp)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Reloc offset is 3x of the .got.plt offset */
|
||
|
|
slli a1, t1, 1 /* Mult items by 2 */
|
||
|
|
add a1, a1, t1 /* Plus item */
|
||
|
|
|
||
|
|
/* Load obj */
|
||
|
|
mv a0, t0
|
||
|
|
|
||
|
|
/* Call into rtld */
|
||
|
|
jal _rtld_bind
|
||
|
|
|
||
|
|
/* Backup the address to branch to */
|
||
|
|
mv t0, a0
|
||
|
|
|
||
|
|
/* Restore the arguments and ra */
|
||
|
|
ld a0, (8 * 0)(sp)
|
||
|
|
ld a1, (8 * 1)(sp)
|
||
|
|
ld a2, (8 * 2)(sp)
|
||
|
|
ld a3, (8 * 3)(sp)
|
||
|
|
ld a4, (8 * 4)(sp)
|
||
|
|
ld a5, (8 * 5)(sp)
|
||
|
|
ld a6, (8 * 6)(sp)
|
||
|
|
ld a7, (8 * 7)(sp)
|
||
|
|
ld ra, (8 * 8)(sp)
|
||
|
|
#if 0
|
||
|
|
/* RISCVTODO VFP */
|
||
|
|
/* Restore floating-point arguments */
|
||
|
|
flq fa0, (8 * 9)(sp)
|
||
|
|
flq fa1, (8 * 11)(sp)
|
||
|
|
flq fa2, (8 * 13)(sp)
|
||
|
|
flq fa3, (8 * 15)(sp)
|
||
|
|
flq fa4, (8 * 17)(sp)
|
||
|
|
flq fa5, (8 * 19)(sp)
|
||
|
|
flq fa6, (8 * 21)(sp)
|
||
|
|
flq fa7, (8 * 23)(sp)
|
||
|
|
#endif
|
||
|
|
addi sp, sp, (8 * 25)
|
||
|
|
|
||
|
|
/* Call into the correct function */
|
||
|
|
jr t0
|
||
|
|
END(_rtld_bind_start)
|