rtld_start.S revision 1.9
1 1.9 mycroft /* $NetBSD: rtld_start.S,v 1.9 2002/10/05 11:59:05 mycroft Exp $ */ 2 1.1 mhitch 3 1.1 mhitch /* 4 1.1 mhitch * Copyright 1997 Michael L. Hitch <mhitch (at) montana.edu> 5 1.9 mycroft * Portions copyright 2002 Charles M. Hannum <root (at) ihack.net> 6 1.1 mhitch * All rights reserved. 7 1.1 mhitch * 8 1.1 mhitch * Redistribution and use in source and binary forms, with or without 9 1.1 mhitch * modification, are permitted provided that the following conditions 10 1.1 mhitch * are met: 11 1.1 mhitch * 1. Redistributions of source code must retain the above copyright 12 1.1 mhitch * notice, this list of conditions and the following disclaimer. 13 1.1 mhitch * 2. Redistributions in binary form must reproduce the above copyright 14 1.1 mhitch * notice, this list of conditions and the following disclaimer in the 15 1.1 mhitch * documentation and/or other materials provided with the distribution. 16 1.1 mhitch * 3. The name of the author may not be used to endorse or promote products 17 1.1 mhitch * derived from this software without specific prior written permission. 18 1.1 mhitch * 19 1.1 mhitch * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 1.1 mhitch * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 1.1 mhitch * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 1.1 mhitch * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 1.1 mhitch * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 1.1 mhitch * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 1.1 mhitch * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 1.1 mhitch * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 1.1 mhitch * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 1.1 mhitch * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 1.1 mhitch */ 30 1.1 mhitch 31 1.1 mhitch #include <mips/asm.h> 32 1.1 mhitch 33 1.5 mycroft .globl _C_LABEL(_rtld_relocate_nonplt_self) 34 1.5 mycroft .globl _C_LABEL(_rtld) 35 1.5 mycroft 36 1.1 mhitch LEAF(rtld_start) 37 1.1 mhitch .set noreorder 38 1.1 mhitch 39 1.1 mhitch .cpload t9 40 1.1 mhitch addu sp, sp, -12 # adjust stack pointer 41 1.3 castor .cprestore 0 # -> 0(sp) for gp 42 1.3 castor # -> 4(sp) for atexit 43 1.3 castor # -> 8(sp) for obj_main 44 1.1 mhitch move s0,a0 # save stack pointer from a0 45 1.2 mhitch move s1,a3 # save ps_strings pointer 46 1.5 mycroft 47 1.5 mycroft la a1, 1f 48 1.5 mycroft bal 1f 49 1.5 mycroft la t9,_C_LABEL(_rtld_relocate_nonplt_self) 50 1.5 mycroft 1: subu a1, ra, a1 # relocbase 51 1.5 mycroft move s2,a1 52 1.5 mycroft la a0,_DYNAMIC 53 1.5 mycroft addu t9, a1, t9 54 1.5 mycroft jalr t9 55 1.5 mycroft addu a0, a1, a0 # &_DYNAMIC 56 1.5 mycroft 57 1.5 mycroft move a1,s2 # relocbase 58 1.5 mycroft addu a0, sp, 4 # sp 59 1.5 mycroft jal _C_LABEL(_rtld) # v0 = _rtld(sp, relocbase) 60 1.5 mycroft nop 61 1.5 mycroft 62 1.1 mhitch lw a1, 4(sp) # our atexit function 63 1.1 mhitch lw a2, 8(sp) # obj_main entry 64 1.1 mhitch addu sp, sp,12 # readjust stack 65 1.1 mhitch move a0,s0 # stack pointer 66 1.1 mhitch move t9,v0 67 1.1 mhitch jr t9 # _start(sp, cleanup, obj); 68 1.1 mhitch move a3,s1 # restore ps_strings 69 1.1 mhitch 70 1.1 mhitch END(rtld_start) 71 1.1 mhitch 72 1.1 mhitch .globl _rtld_bind_start 73 1.1 mhitch .ent _rtld_bind_start 74 1.1 mhitch _rtld_bind_start: 75 1.1 mhitch 76 1.1 mhitch move v1,gp # save old GP 77 1.1 mhitch add t9,8 # modify T9 to point at .cpload 78 1.1 mhitch .cpload t9 79 1.7 mycroft subu sp,44 # save arguments and sp value in stack 80 1.7 mycroft .cprestore 36 81 1.7 mycroft sw t7,40(sp) 82 1.7 mycroft sw a0,16(sp) 83 1.7 mycroft sw a1,20(sp) 84 1.7 mycroft sw a2,24(sp) 85 1.7 mycroft sw a3,28(sp) 86 1.7 mycroft sw s0,32(sp) 87 1.1 mhitch move s0,sp 88 1.1 mhitch move a0,t8 # symbol index 89 1.1 mhitch move a1,t7 # old RA 90 1.1 mhitch move a2,v1 # old GP 91 1.1 mhitch move a3,ra # current RA 92 1.8 mycroft jal _C_LABEL(_rtld_bind) 93 1.1 mhitch nop 94 1.1 mhitch move sp,s0 95 1.7 mycroft lw ra,40(sp) 96 1.7 mycroft lw a0,16(sp) 97 1.7 mycroft lw a1,20(sp) 98 1.7 mycroft lw a2,24(sp) 99 1.7 mycroft lw a3,28(sp) 100 1.7 mycroft lw s0,32(sp) 101 1.7 mycroft addu sp,44 102 1.1 mhitch move t9,v0 103 1.1 mhitch jr t9 104 1.1 mhitch nop 105 1.1 mhitch .end _rtld_bind_start 106
Indexes created Mon Sep 29 21:09:56 GMT 2025