__sigtramp2.S revision 1.6
1 /* $NetBSD: __sigtramp2.S,v 1.6 2020/10/24 07:02:20 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas of 3am Software Foundry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include "SYS.h" 33 #include "assym.h" 34 35 /* 36 * The ARM64 signal trampoline is invoked only to return from 37 * the signal; the kernel calls the signal handler directly. 38 * 39 * On entry, the stack looks like: 40 * 41 * ucontext structure 42 * sp-> siginfo structure 43 * and x28 points to the ucontext 44 */ 45 46 /* 47 * The unwind entry includes the one instruction prior to the trampoline 48 * because the unwinder will look up (return PC - 1) while unwinding. 49 * Normally this would be the jump / branch, but since there isn't one in 50 * this case, we place an explicit nop there instead. 51 */ 52 .cfi_startproc simple 53 .cfi_signal_frame 54 .cfi_def_cfa x28, 0 55 .cfi_offset x0, _UC_REGS_X0 56 .cfi_offset x1, _UC_REGS_X1 57 .cfi_offset x2, _UC_REGS_X2 58 .cfi_offset x3, _UC_REGS_X3 59 .cfi_offset x4, _UC_REGS_X4 60 .cfi_offset x5, _UC_REGS_X5 61 .cfi_offset x6, _UC_REGS_X6 62 .cfi_offset x7, _UC_REGS_X7 63 .cfi_offset x8, _UC_REGS_X8 64 .cfi_offset x9, _UC_REGS_X9 65 .cfi_offset x10, _UC_REGS_X10 66 .cfi_offset x11, _UC_REGS_X11 67 .cfi_offset x12, _UC_REGS_X12 68 .cfi_offset x13, _UC_REGS_X13 69 .cfi_offset x14, _UC_REGS_X14 70 .cfi_offset x15, _UC_REGS_X15 71 .cfi_offset x16, _UC_REGS_X16 72 .cfi_offset x17, _UC_REGS_X17 73 .cfi_offset x18, _UC_REGS_X18 74 .cfi_offset x19, _UC_REGS_X19 75 .cfi_offset x20, _UC_REGS_X20 76 .cfi_offset x21, _UC_REGS_X21 77 .cfi_offset x22, _UC_REGS_X22 78 .cfi_offset x23, _UC_REGS_X23 79 .cfi_offset x24, _UC_REGS_X24 80 .cfi_offset x25, _UC_REGS_X25 81 .cfi_offset x26, _UC_REGS_X26 82 .cfi_offset x27, _UC_REGS_X27 83 .cfi_offset x28, _UC_REGS_X28 84 .cfi_offset x29, _UC_REGS_X29 85 .cfi_offset lr, _UC_REGS_LR 86 .cfi_offset sp, _UC_REGS_SP 87 nop 88 ENTRY_NP(__sigtramp_siginfo_2) 89 mov x0, x28 /* set the arg */ 90 SYSTRAP(setcontext) /* and call setcontext */ 91 92 /* If that failed, exit with the error code. */ 93 SYSTRAP(exit) 94 .cfi_endproc 95 END(__sigtramp_siginfo_2) 96
Indexes created Sat Oct 18 21:09:54 GMT 2025