1/* $NetBSD: __sigtramp2.S,v 1.9 2020/10/19 11:29:26 kamil Exp $ */ 2 3/* 4 * Copyright (c) 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Frank van der Linden for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38#include "SYS.h" 39#include "assym.h" 40 41/* 42 * The x86-64 signal trampoline is invoked only to return from 43 * the signal; the kernel calls the signal handler directly. 44 * 45 * The unwind entry includes the one byte prior to the trampoline 46 * because the unwinder will look up (return PC - 1) while unwinding. 47 * Normally (return PC - 1) computes an address inside the call 48 * instruction that created the child frame, but here there is no call 49 * instruction so we have to manually add padding. 50 */ 51 .cfi_startproc simple 52 .cfi_signal_frame 53 .cfi_def_cfa r15, 0 54 .cfi_offset rax, UC_GREGS_RAX 55 .cfi_offset rdx, UC_GREGS_RDX 56 .cfi_offset rcx, UC_GREGS_RCX 57 .cfi_offset rbx, UC_GREGS_RBX 58 .cfi_offset rsi, UC_GREGS_RSI 59 .cfi_offset rdi, UC_GREGS_RDI 60 .cfi_offset rbp, UC_GREGS_RBP 61 .cfi_offset rsp, UC_GREGS_RSP 62 .cfi_offset r8, UC_GREGS_R8 63 .cfi_offset r9, UC_GREGS_R9 64 .cfi_offset r10, UC_GREGS_R10 65 .cfi_offset r11, UC_GREGS_R11 66 .cfi_offset r12, UC_GREGS_R12 67 .cfi_offset r13, UC_GREGS_R13 68 .cfi_offset r14, UC_GREGS_R14 69 .cfi_offset r15, UC_GREGS_R15 70 .cfi_offset rip, UC_GREGS_RIP 71 nop 72NENTRY(__sigtramp_siginfo_2) 73 movq %r15,%rdi 74 movq $SYS_setcontext, %rax 75 syscall 76 movq $-1,%rdi /* if we return here, something is wrong */ 77 movq $SYS_exit, %rax 78 syscall 79 .cfi_endproc 80END(__sigtramp_siginfo_2) 81