rtld_start.S revision 1.2
1 1.2 mhitch /* $NetBSD: rtld_start.S,v 1.2 1998/04/09 04:45:08 mhitch 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 <machine/regdef.h> 31 1.1 mhitch #include <mips/asm.h> 32 1.1 mhitch 33 1.1 mhitch LEAF(rtld_start) 34 1.1 mhitch .set noreorder 35 1.1 mhitch 36 1.1 mhitch .cpload t9 37 1.1 mhitch addu sp, sp, -12 # adjust stack pointer 38 1.1 mhitch .cprestore 0 # 0(sp) for gp 39 1.1 mhitch # 4(sp) for atexit 40 1.1 mhitch # 8(sp) for obj_main 41 1.1 mhitch move s0,a0 # save stack pointer from a0 42 1.1 mhitch addu a0, sp, 4 # _rtld argument 43 1.2 mhitch move s1,a3 # save ps_strings pointer 44 1.1 mhitch jal _C_LABEL(_rtld) # v0 = _rtld(sp) 45 1.2 mhitch nop # [BD if jal not expanded] 46 1.1 mhitch lw a1, 4(sp) # our atexit function 47 1.1 mhitch lw a2, 8(sp) # obj_main entry 48 1.1 mhitch addu sp, sp,12 # readjust stack 49 1.1 mhitch move a0,s0 # stack pointer 50 1.1 mhitch move t9,v0 51 1.1 mhitch jr t9 # _start(sp, cleanup, obj); 52 1.1 mhitch move a3,s1 # restore ps_strings 53 1.1 mhitch 54 1.1 mhitch END(rtld_start) 55 1.1 mhitch 56 1.1 mhitch .globl _rtld_bind_start 57 1.1 mhitch .ent _rtld_bind_start 58 1.1 mhitch _rtld_bind_start: 59 1.1 mhitch 60 1.1 mhitch move v1,gp # save old GP 61 1.1 mhitch add t9,8 # modify T9 to point at .cpload 62 1.1 mhitch .cpload t9 63 1.1 mhitch subu sp,40 # save arguments and sp value in stack 64 1.1 mhitch .cprestore 32 65 1.1 mhitch sw t7,36(sp) 66 1.1 mhitch sw a0,12(sp) 67 1.1 mhitch sw a1,16(sp) 68 1.1 mhitch sw a2,20(sp) 69 1.1 mhitch sw a3,24(sp) 70 1.1 mhitch sw s0,28(sp) 71 1.1 mhitch move s0,sp 72 1.1 mhitch move a0,t8 # symbol index 73 1.1 mhitch move a1,t7 # old RA 74 1.1 mhitch move a2,v1 # old GP 75 1.1 mhitch move a3,ra # current RA 76 1.1 mhitch jal _C_LABEL(_rtld_bind_mips) 77 1.1 mhitch nop 78 1.1 mhitch move sp,s0 79 1.1 mhitch lw ra,36(sp) 80 1.1 mhitch lw a0,12(sp) 81 1.1 mhitch lw a1,16(sp) 82 1.1 mhitch lw a2,20(sp) 83 1.1 mhitch lw a3,24(sp) 84 1.1 mhitch lw s0,28(sp) 85 1.1 mhitch addu sp,40 86 1.1 mhitch move t9,v0 87 1.1 mhitch jr t9 88 1.1 mhitch nop 89 1.1 mhitch .end _rtld_bind_start 90
Indexes created Tue Sep 30 17:09:57 GMT 2025