1 /* $NetBSD: h_execregs.S,v 1.1 2025/04/27 02:24:07 uwe Exp $ */ 2 3 /*- 4 * Copyright (c) 2025 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #define _LOCORE 30 #include <machine/asm.h> 31 #include <machine/mcontext.h> 32 #include <sys/syscall.h> 33 34 35 // ELF entry point 36 ENTRY(execregs_start) 37 // __gregset_t r; // mcontext (but general regs only) 38 mov.l sp, @-sp 39 mov.l r0, @-sp 40 mov.l r1, @-sp 41 mov.l r2, @-sp 42 mov.l r3, @-sp 43 mov.l r4, @-sp 44 mov.l r5, @-sp 45 mov.l r6, @-sp 46 mov.l r7, @-sp 47 mov.l r8, @-sp 48 mov.l r9, @-sp 49 mov.l r10, @-sp 50 mov.l r11, @-sp 51 mov.l r12, @-sp 52 mov.l r13, @-sp 53 mov.l r14, @-sp 54 sts.l pr, @-sp 55 sts.l mach, @-sp 56 sts.l macl, @-sp 57 mov #0, r0 58 mov.l r0, @-sp // _REG_SR is privileged 59 mova .Lend, r0 // _REG_PC 60 mov.l @r0, r1 61 sub r1, r0 62 mov.l r0, @-sp 63 stc.l gbr, @-sp 64 65 // write(STDOUT_FILENO, &r, sizeof(__gregset_t)) 66 mov #1, r4 67 mov sp, r5 68 mov #(_NGREG * 4), r6 69 mov #SYS_write, r0 70 trapa #0x80 71 72 // _exit(0) 73 mov #0, r4 74 mov #SYS_exit, r0 75 trapa #0x80 76 77 .p2align 2 78 .Lend: .long .Lend - execregs_start 79 SET_ENTRY_SIZE(execregs_start) 80 81 82 // main stub to simplify linking 83 ENTRY(main) 84 rts 85 mov #0, r0 86 SET_ENTRY_SIZE(main) 87
Indexes created Thu Oct 02 14:10:14 GMT 2025