1/* $NetBSD: __sigtramp2.S,v 1.5 2021/11/27 10:00:01 skrll Exp $ */ 2 3/*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 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 ARM 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 r5 points to the ucontext 44 */ 45 46#define CFI_OFFSET(r) .cfi_offset r, r * 4 47 48 _TEXT_SECTION 49 .cfi_startproc 50 .cfi_signal_frame 51 .cfi_def_cfa _REG_SP, SIZEOF_SIGINFO + _UC_GREGS 52 CFI_OFFSET(_REG_R0) 53 CFI_OFFSET(_REG_R1) 54 CFI_OFFSET(_REG_R2) 55 CFI_OFFSET(_REG_R3) 56 CFI_OFFSET(_REG_R4) 57 CFI_OFFSET(_REG_R5) 58 CFI_OFFSET(_REG_R6) 59 CFI_OFFSET(_REG_R7) 60 CFI_OFFSET(_REG_R8) 61 CFI_OFFSET(_REG_R9) 62 CFI_OFFSET(_REG_R10) 63 CFI_OFFSET(_REG_R11) 64 CFI_OFFSET(_REG_R12) 65 CFI_OFFSET(_REG_R13) /* a.k.a. _REG_SP */ 66 CFI_OFFSET(_REG_R14) /* a.k.a. _REG_LR */ 67 .cfi_return_column _REG_R15 68 CFI_OFFSET(_REG_R15) /* a.k.a. _REG_PC */ 69 70/* 71 * The unwind entry includes the one instruction prior to the trampoline 72 * because the unwinder will look up (return PC - 1) while unwinding. 73 * Normally this would be the jump / branch, but since there isn't one in 74 * this case, we place an explicit nop there instead. 75 */ 76 nop 77 78ENTRY_NP(__sigtramp_siginfo_2) 79 mov r0, r5 /* set the arg */ 80 SYSTRAP(setcontext) /* and call setcontext */ 81 82 /* If that failed, exit with the error code. */ 83 SYSTRAP(exit) 84 .cfi_endproc 85END(__sigtramp_siginfo_2) 86