1/*- 2 * Copyright (c) 2003 Peter Wemm <peter@freeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/sys/amd64/amd64/sigtramp.S,v 1.1 2003/05/01 01:05:21 peter Exp $ 27 */ 28 29#include <sys/syscall.h> 30 31#include <machine/asmacros.h> 32 33#include "assym.s" 34 35 .text 36/********************************************************************** 37 * 38 * Signal trampoline, copied to top of user stack 39 * 40 * arguments: %rdi, %rsi, %rdx, %rcx 41 */ 42NON_GPROF_ENTRY(sigcode) 43 call *SIGF_HANDLER(%rsp) /* call signal handler */ 44 lea SIGF_UC(%rsp),%rdi /* get ucontext_t */ 45 pushq $0 /* junk to fake return addr. */ 46 movq $SYS_sigreturn,%rax 47 syscall /* enter kernel with args */ 480: hlt /* trap priviliged instruction */ 49 jmp 0b 50 51 /* 52 * Work around a Ryzen bug (say whut?). There appears to be an 53 * issue with the kernel iretq'ing to a %rip near the end of the 54 * user address space (top of stack). 55 */ 56 .space 1088 57 58 ALIGN_TEXT 59esigcode: 60 61 .data 62 .globl szsigcode 63szsigcode: 64 .long esigcode-sigcode 65