1292691Sbr/*- 2292691Sbr * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com> 3292691Sbr * All rights reserved. 4292691Sbr * 5292691Sbr * This software was developed by SRI International and the University of 6292691Sbr * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237 7292691Sbr * ("CTSRD"), as part of the DARPA CRASH research programme. 8292691Sbr * 9292691Sbr * This software was developed by the University of Cambridge Computer 10292691Sbr * Laboratory as part of the CTSRD Project, with support from the UK Higher 11292691Sbr * Education Innovation Fund (HEIF). 12292691Sbr * 13292691Sbr * Redistribution and use in source and binary forms, with or without 14292691Sbr * modification, are permitted provided that the following conditions 15292691Sbr * are met: 16292691Sbr * 1. Redistributions of source code must retain the above copyright 17292691Sbr * notice, this list of conditions and the following disclaimer. 18292691Sbr * 2. Redistributions in binary form must reproduce the above copyright 19292691Sbr * notice, this list of conditions and the following disclaimer in the 20292691Sbr * documentation and/or other materials provided with the distribution. 21292691Sbr * 22292691Sbr * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23292691Sbr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24292691Sbr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25292691Sbr * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26292691Sbr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27292691Sbr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28292691Sbr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29292691Sbr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30292691Sbr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31292691Sbr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32292691Sbr * SUCH DAMAGE. 33292691Sbr */ 34292691Sbr 35292691Sbr#include <machine/asm.h> 36292691Sbr__FBSDID("$FreeBSD: releng/11.0/libexec/rtld-elf/riscv/rtld_start.S 292691 2015-12-24 15:47:51Z br $"); 37292691Sbr 38292691Sbr/* 39292691Sbr * func_ptr_type 40292691Sbr * _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp) 41292691Sbr */ 42292691Sbr 43292691SbrENTRY(.rtld_start) 44292691Sbr mv s0, a0 /* Put ps_strings in a callee-saved register */ 45292691Sbr mv s1, sp /* And the stack pointer */ 46292691Sbr 47292691Sbr addi sp, sp, -16 /* Make room for obj_main & exit proc */ 48292691Sbr 49292691Sbr mv a1, sp /* exit_proc */ 50292691Sbr addi a2, a1, 8 /* obj_main */ 51292691Sbr jal _rtld /* Call the loader */ 52292691Sbr mv t0, a0 /* Backup the entry point */ 53292691Sbr 54292691Sbr ld a2, 0(sp) /* Load cleanup */ 55292691Sbr ld a1, 8(sp) /* Load obj_main */ 56292691Sbr mv a0, s0 /* Restore ps_strings */ 57292691Sbr mv sp, s1 /* Restore the stack pointer */ 58292691Sbr jr t0 /* Jump to the entry point */ 59292691SbrEND(.rtld_start) 60292691Sbr 61292691Sbr/* 62292691Sbr * t0 = obj pointer 63292691Sbr * t1 = reloc offset 64292691Sbr */ 65292691SbrENTRY(_rtld_bind_start) 66292691Sbr /* Save the arguments and ra */ 67292691Sbr addi sp, sp, -(8 * 25) 68292691Sbr sd a0, (8 * 0)(sp) 69292691Sbr sd a1, (8 * 1)(sp) 70292691Sbr sd a2, (8 * 2)(sp) 71292691Sbr sd a3, (8 * 3)(sp) 72292691Sbr sd a4, (8 * 4)(sp) 73292691Sbr sd a5, (8 * 5)(sp) 74292691Sbr sd a6, (8 * 6)(sp) 75292691Sbr sd a7, (8 * 7)(sp) 76292691Sbr sd ra, (8 * 8)(sp) 77292691Sbr#if 0 78292691Sbr /* RISCVTODO VFP */ 79292691Sbr /* Save any floating-point arguments */ 80292691Sbr fsq fa0, (8 * 9)(sp) 81292691Sbr fsq fa1, (8 * 11)(sp) 82292691Sbr fsq fa2, (8 * 13)(sp) 83292691Sbr fsq fa3, (8 * 15)(sp) 84292691Sbr fsq fa4, (8 * 17)(sp) 85292691Sbr fsq fa5, (8 * 19)(sp) 86292691Sbr fsq fa6, (8 * 21)(sp) 87292691Sbr fsq fa7, (8 * 23)(sp) 88292691Sbr#endif 89292691Sbr 90292691Sbr /* Reloc offset is 3x of the .got.plt offset */ 91292691Sbr slli a1, t1, 1 /* Mult items by 2 */ 92292691Sbr add a1, a1, t1 /* Plus item */ 93292691Sbr 94292691Sbr /* Load obj */ 95292691Sbr mv a0, t0 96292691Sbr 97292691Sbr /* Call into rtld */ 98292691Sbr jal _rtld_bind 99292691Sbr 100292691Sbr /* Backup the address to branch to */ 101292691Sbr mv t0, a0 102292691Sbr 103292691Sbr /* Restore the arguments and ra */ 104292691Sbr ld a0, (8 * 0)(sp) 105292691Sbr ld a1, (8 * 1)(sp) 106292691Sbr ld a2, (8 * 2)(sp) 107292691Sbr ld a3, (8 * 3)(sp) 108292691Sbr ld a4, (8 * 4)(sp) 109292691Sbr ld a5, (8 * 5)(sp) 110292691Sbr ld a6, (8 * 6)(sp) 111292691Sbr ld a7, (8 * 7)(sp) 112292691Sbr ld ra, (8 * 8)(sp) 113292691Sbr#if 0 114292691Sbr /* RISCVTODO VFP */ 115292691Sbr /* Restore floating-point arguments */ 116292691Sbr flq fa0, (8 * 9)(sp) 117292691Sbr flq fa1, (8 * 11)(sp) 118292691Sbr flq fa2, (8 * 13)(sp) 119292691Sbr flq fa3, (8 * 15)(sp) 120292691Sbr flq fa4, (8 * 17)(sp) 121292691Sbr flq fa5, (8 * 19)(sp) 122292691Sbr flq fa6, (8 * 21)(sp) 123292691Sbr flq fa7, (8 * 23)(sp) 124292691Sbr#endif 125292691Sbr addi sp, sp, (8 * 25) 126292691Sbr 127292691Sbr /* Call into the correct function */ 128292691Sbr jr t0 129292691SbrEND(_rtld_bind_start) 130