1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2017 Michal Meloun <mmel@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/types.h> 33 #include <sys/ucontext.h> 34 #include <errno.h> 35 #include <stdlib.h> 36 #include <machine/sysarch.h> 37 38 struct ucontextx { 39 ucontext_t ucontext; 40 mcontext_vfp_t mcontext_vfp; 41 }; 42 43 int 44 __getcontextx_size(void) 45 { 46 47 return (sizeof(struct ucontextx)); 48 } 49 50 int 51 __fillcontextx2(char *ctx) 52 { 53 struct ucontextx *ucxp; 54 ucontext_t *ucp; 55 mcontext_vfp_t *mvp; 56 struct arm_get_vfpstate_args vfp_arg; 57 58 ucxp = (struct ucontextx *)ctx; 59 ucp = &ucxp->ucontext; 60 mvp = &ucxp->mcontext_vfp; 61 62 vfp_arg.mc_vfp_size = sizeof(mcontext_vfp_t); 63 vfp_arg.mc_vfp = mvp; 64 if (sysarch(ARM_GET_VFPSTATE, &vfp_arg) == -1) 65 return (-1); 66 ucp->uc_mcontext.mc_vfp_size = sizeof(mcontext_vfp_t); 67 ucp->uc_mcontext.mc_vfp_ptr = mvp; 68 return (0); 69 } 70 71 int 72 __fillcontextx(char *ctx) 73 { 74 struct ucontextx *ucxp; 75 76 ucxp = (struct ucontextx *)ctx; 77 if (getcontext(&ucxp->ucontext) == -1) 78 return (-1); 79 __fillcontextx2(ctx); 80 return (0); 81 } 82 83 __weak_reference(__getcontextx, getcontextx); 84 85 ucontext_t * 86 __getcontextx(void) 87 { 88 char *ctx; 89 int error; 90 91 ctx = malloc(__getcontextx_size()); 92 if (ctx == NULL) 93 return (NULL); 94 if (__fillcontextx(ctx) == -1) { 95 error = errno; 96 free(ctx); 97 errno = error; 98 return (NULL); 99 } 100 return ((ucontext_t *)ctx); 101 } 102