rtld_start.S revision 1.5
1 1.5 mycroft /* $NetBSD: rtld_start.S,v 1.5 2002/09/12 17:08:32 mycroft Exp $ */ 2 1.1 mhitch 3 1.1 mhitch /* 4 1.1 mhitch * Copyright 1997 Michael L. Hitch <mhitch (at) montana.edu> 5 1.1 mhitch * All rights reserved. 6 1.1 mhitch * 7 1.1 mhitch * Redistribution and use in source and binary forms, with or without 8 1.1 mhitch * modification, are permitted provided that the following conditions 9 1.1 mhitch * are met: 10 1.1 mhitch * 1. Redistributions of source code must retain the above copyright 11 1.1 mhitch * notice, this list of conditions and the following disclaimer. 12 1.1 mhitch * 2. Redistributions in binary form must reproduce the above copyright 13 1.1 mhitch * notice, this list of conditions and the following disclaimer in the 14 1.1 mhitch * documentation and/or other materials provided with the distribution. 15 1.1 mhitch * 3. The name of the author may not be used to endorse or promote products 16 1.1 mhitch * derived from this software without specific prior written permission. 17 1.1 mhitch * 18 1.1 mhitch * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 1.1 mhitch * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 1.1 mhitch * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 1.1 mhitch * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 1.1 mhitch * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 1.1 mhitch * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 1.1 mhitch * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 1.1 mhitch * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 1.1 mhitch * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 1.1 mhitch * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 1.1 mhitch */ 29 1.1 mhitch 30 1.1 mhitch #include <mips/asm.h> 31 1.1 mhitch 32 1.5 mycroft .globl _C_LABEL(_rtld_relocate_nonplt_self) 33 1.5 mycroft .globl _C_LABEL(_rtld) 34 1.5 mycroft 35 1.1 mhitch LEAF(rtld_start) 36 1.1 mhitch .set noreorder 37 1.1 mhitch 38 1.1 mhitch .cpload t9 39 1.1 mhitch addu sp, sp, -12 # adjust stack pointer 40 1.3 castor .cprestore 0 # -> 0(sp) for gp 41 1.3 castor # -> 4(sp) for atexit 42 1.3 castor # -> 8(sp) for obj_main 43 1.1 mhitch move s0,a0 # save stack pointer from a0 44 1.2 mhitch move s1,a3 # save ps_strings pointer 45 1.5 mycroft 46 1.5 mycroft la a1, 1f 47 1.5 mycroft bal 1f 48 1.5 mycroft la t9,_C_LABEL(_rtld_relocate_nonplt_self) 49 1.5 mycroft 1: subu a1, ra, a1 # relocbase 50 1.5 mycroft move s2,a1 51 1.5 mycroft la a0,_DYNAMIC 52 1.5 mycroft addu t9, a1, t9 53 1.5 mycroft jalr t9 54 1.5 mycroft addu a0, a1, a0 # &_DYNAMIC 55 1.5 mycroft 56 1.5 mycroft move a1,s2 # relocbase 57 1.5 mycroft addu a0, sp, 4 # sp 58 1.5 mycroft jal _C_LABEL(_rtld) # v0 = _rtld(sp, relocbase) 59 1.5 mycroft nop 60 1.5 mycroft 61 1.1 mhitch lw a1, 4(sp) # our atexit function 62 1.1 mhitch lw a2, 8(sp) # obj_main entry 63 1.1 mhitch addu sp, sp,12 # readjust stack 64 1.1 mhitch move a0,s0 # stack pointer 65 1.1 mhitch move t9,v0 66 1.1 mhitch jr t9 # _start(sp, cleanup, obj); 67 1.1 mhitch move a3,s1 # restore ps_strings 68 1.1 mhitch 69 1.1 mhitch END(rtld_start) 70 1.1 mhitch 71 1.1 mhitch .globl _rtld_bind_start 72 1.1 mhitch .ent _rtld_bind_start 73 1.1 mhitch _rtld_bind_start: 74 1.1 mhitch 75 1.1 mhitch move v1,gp # save old GP 76 1.1 mhitch add t9,8 # modify T9 to point at .cpload 77 1.1 mhitch .cpload t9 78 1.1 mhitch subu sp,40 # save arguments and sp value in stack 79 1.1 mhitch .cprestore 32 80 1.1 mhitch sw t7,36(sp) 81 1.1 mhitch sw a0,12(sp) 82 1.1 mhitch sw a1,16(sp) 83 1.1 mhitch sw a2,20(sp) 84 1.1 mhitch sw a3,24(sp) 85 1.1 mhitch sw s0,28(sp) 86 1.1 mhitch move s0,sp 87 1.1 mhitch move a0,t8 # symbol index 88 1.1 mhitch move a1,t7 # old RA 89 1.1 mhitch move a2,v1 # old GP 90 1.1 mhitch move a3,ra # current RA 91 1.1 mhitch jal _C_LABEL(_rtld_bind_mips) 92 1.1 mhitch nop 93 1.1 mhitch move sp,s0 94 1.1 mhitch lw ra,36(sp) 95 1.1 mhitch lw a0,12(sp) 96 1.1 mhitch lw a1,16(sp) 97 1.1 mhitch lw a2,20(sp) 98 1.1 mhitch lw a3,24(sp) 99 1.1 mhitch lw s0,28(sp) 100 1.1 mhitch addu sp,40 101 1.1 mhitch move t9,v0 102 1.1 mhitch jr t9 103 1.1 mhitch nop 104 1.1 mhitch .end _rtld_bind_start 105
Indexes created Tue Sep 30 17:09:57 GMT 2025