sys/platform/pc64/x86_64/sigtramp.s

   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  */
  42 NON_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 */
  48 0:      hlt                             /* trap priviliged instruction */
  49         jmp     0b
  50
  51         /*
  52          * Work around a Ryzen bug (say whut?)
  53          */
  54         .space  224
  55
  56         ALIGN_TEXT
  57 esigcode:
  58
  59         .data
  60         .globl  szsigcode
  61 szsigcode:
  62         .long   esigcode-sigcode