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129 lines
3.8 KiB
ArmAsm
129 lines
3.8 KiB
ArmAsm
/*-
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* Copyright (c) 2015-2018 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* This software was developed by the University of Cambridge Computer
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* Laboratory as part of the CTSRD Project, with support from the UK Higher
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* Education Innovation Fund (HEIF).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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/*
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* func_ptr_type
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* _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp)
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*/
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ENTRY(.rtld_start)
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mv s0, a0 /* Put ps_strings in a callee-saved register */
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mv s1, sp /* And the stack pointer */
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addi sp, sp, -16 /* Make room for obj_main & exit proc */
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mv a1, sp /* exit_proc */
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addi a2, a1, 8 /* obj_main */
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jal _rtld /* Call the loader */
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mv t0, a0 /* Backup the entry point */
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ld a2, 0(sp) /* Load cleanup */
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ld a1, 8(sp) /* Load obj_main */
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mv a0, s0 /* Restore ps_strings */
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mv sp, s1 /* Restore the stack pointer */
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jr t0 /* Jump to the entry point */
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END(.rtld_start)
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/*
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* t0 = obj pointer
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* t1 = reloc offset
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*/
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ENTRY(_rtld_bind_start)
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/* Save the arguments and ra */
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/* We require 17 dwords, but the stack must be aligned to 16-bytes */
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addi sp, sp, -(8 * 18)
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sd a0, (8 * 0)(sp)
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sd a1, (8 * 1)(sp)
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sd a2, (8 * 2)(sp)
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sd a3, (8 * 3)(sp)
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sd a4, (8 * 4)(sp)
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sd a5, (8 * 5)(sp)
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sd a6, (8 * 6)(sp)
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sd a7, (8 * 7)(sp)
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sd ra, (8 * 8)(sp)
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#ifdef __riscv_float_abi_double
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/* Save any floating-point arguments */
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fsd fa0, (8 * 9)(sp)
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fsd fa1, (8 * 10)(sp)
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fsd fa2, (8 * 11)(sp)
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fsd fa3, (8 * 12)(sp)
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fsd fa4, (8 * 13)(sp)
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fsd fa5, (8 * 14)(sp)
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fsd fa6, (8 * 15)(sp)
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fsd fa7, (8 * 16)(sp)
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#endif
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/* Reloc offset is 3x of the .got.plt offset */
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slli a1, t1, 1 /* Mult items by 2 */
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add a1, a1, t1 /* Plus item */
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/* Load obj */
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mv a0, t0
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/* Call into rtld */
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jal _rtld_bind
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/* Backup the address to branch to */
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mv t0, a0
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/* Restore the arguments and ra */
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ld a0, (8 * 0)(sp)
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ld a1, (8 * 1)(sp)
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ld a2, (8 * 2)(sp)
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ld a3, (8 * 3)(sp)
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ld a4, (8 * 4)(sp)
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ld a5, (8 * 5)(sp)
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ld a6, (8 * 6)(sp)
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ld a7, (8 * 7)(sp)
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ld ra, (8 * 8)(sp)
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#ifdef __riscv_float_abi_double
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/* Restore floating-point arguments */
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fld fa0, (8 * 9)(sp)
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fld fa1, (8 * 10)(sp)
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fld fa2, (8 * 11)(sp)
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fld fa3, (8 * 12)(sp)
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fld fa4, (8 * 13)(sp)
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fld fa5, (8 * 14)(sp)
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fld fa6, (8 * 15)(sp)
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fld fa7, (8 * 16)(sp)
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#endif
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addi sp, sp, (8 * 18)
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/* Call into the correct function */
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jr t0
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END(_rtld_bind_start)
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