1/* $OpenBSD: ldasm.S,v 1.24 2019/09/02 12:43:54 mortimer Exp $ */ 2 3/* 4 * Copyright (c) 1998-2002 Opsycon AB, Sweden. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 29#include <machine/asm.h> 30#include <sys/syscall.h> 31 32/* Stack at this stage is: 33 * struct stack { 34 * int kargc; 35 * char *kargv[1]; size depends on kargc 36 * char kargstr[1]; size varies 37 * char kenvstr[1]; size varies 38 * }; 39 */ 40 41FRAMESZ= MKFSIZ(4,16) 42GPOFF= FRAMESZ-2*REGSZ 43RAOFF= FRAMESZ-1*REGSZ 44A0OFF= FRAMESZ-3*REGSZ 45A1OFF= FRAMESZ-4*REGSZ 46A2OFF= FRAMESZ-5*REGSZ 47A3OFF= FRAMESZ-6*REGSZ 48A4OFF= FRAMESZ-7*REGSZ 49A5OFF= FRAMESZ-8*REGSZ 50A6OFF= FRAMESZ-9*REGSZ 51A7OFF= FRAMESZ-10*REGSZ 52S0OFF= FRAMESZ-11*REGSZ 53 54LEAF(_dl_start, FRAMESZ) /* Not really LEAF, but we simplify */ 55 PTR_SUBU sp, FRAMESZ # Some space. 56 SETUP_GP64(GPOFF, _dl_start) 57 58 LA s1, 1f 59 bgezal zero, 1f 601: 61 PTR_SUBU s0, ra, s1 # This is the load offset 62 63 PTR_ADDU a0, sp, FRAMESZ # Where stack info is. 64 PTR_ADDU a1, sp, 0 # Where fast AUX info will be. 65 LA a2, _DYNAMIC 66 PTR_ADDU a2, s0 # Where _DYNAMIC is 67 LA t9, _dl_boot_bind 68 PTR_ADDU t9, s0 69 jalr t9 # Relocate ourself. 70 71 REG_L a3, FRAMESZ(sp) # argc 72 PTR_ADDU a0, sp, FRAMESZ+REGSZ # argv 73 PTR_ADDU a1, a0, REGSZ 74 PTR_SLL a3, a3, LOGREGSZ 75 PTR_ADDU a1, a3 76 PTR_ADDU a3, sp, 0 # Where fast AUX info will be. 77 move a2, s0 # Load offset 78 jal _dl_boot # Go do the linking. 79 80 move t9, v0 # Entry address from _dl_boot. 81 LA v0, _dl_dtors # cleanup 82 83 RESTORE_GP64 84 PTR_ADDU sp, FRAMESZ # Restore stack pointer. 85 move ra, zero # Mark last stack frame. 86 j t9 # Go execute the 'real' program. 87END(_dl_start) 88 89 .globl _dl_bind_start 90 .ent _dl_bind_start, 0 91_dl_bind_start: 92 ld v1, -32744(gp) 93 PTR_SUBU sp, FRAMESZ 94 SETUP_GP64(GPOFF, _dl_bind_start) 95 REG_S a0, A0OFF(sp) 96 REG_S a1, A1OFF(sp) 97 REG_S a2, A2OFF(sp) 98 REG_S a3, A3OFF(sp) 99 REG_S a4, A4OFF(sp) 100 REG_S a5, A5OFF(sp) 101 REG_S a6, A6OFF(sp) 102 REG_S a7, A7OFF(sp) 103 REG_S $15, RAOFF(sp) 104 REG_S s0, S0OFF(sp) 105 move s0, sp 106 move a0, v1 107 move a1, t8 108 jal _dl_bind 109 110 move sp, s0 111 REG_L ra, RAOFF(sp) 112 REG_L s0, S0OFF(sp) 113 REG_L a0, A0OFF(sp) 114 REG_L a1, A1OFF(sp) 115 REG_L a2, A2OFF(sp) 116 REG_L a3, A3OFF(sp) 117 REG_L a4, A4OFF(sp) 118 REG_L a5, A5OFF(sp) 119 REG_L a6, A6OFF(sp) 120 REG_L a7, A7OFF(sp) 121 RESTORE_GP64 122 PTR_ADDU sp, FRAMESZ 123 move t9, v0 124 jr t9 125 .end _dl_bind_start 126