1 /*- 2 * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * Portions of this software were developed by SRI International and the 6 * University of Cambridge Computer Laboratory under DARPA/AFRL contract 7 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme. 8 * 9 * Portions of this software were developed by the University of Cambridge 10 * Computer Laboratory as part of the CTSRD Project, with support from the 11 * UK Higher Education Innovation Fund (HEIF). 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 40 #include <machine/riscvreg.h> 41 42 #include <inttypes.h> 43 #include <stdarg.h> 44 #include <stdlib.h> 45 #include <ucontext.h> 46 47 void _ctx_start(void); 48 49 void 50 ctx_done(ucontext_t *ucp) 51 { 52 53 if (ucp->uc_link == NULL) { 54 exit(0); 55 } else { 56 setcontext((const ucontext_t *)ucp->uc_link); 57 abort(); 58 } 59 } 60 61 __weak_reference(__makecontext, makecontext); 62 63 void 64 __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...) 65 { 66 struct gpregs *gp; 67 va_list ap; 68 int i; 69 70 /* A valid context is required. */ 71 if (ucp == NULL) 72 return; 73 74 if ((argc < 0) || (argc > 8)) 75 return; 76 77 gp = &ucp->uc_mcontext.mc_gpregs; 78 79 va_start(ap, argc); 80 /* Pass up to eight arguments in a0-7. */ 81 for (i = 0; i < argc && i < 8; i++) 82 gp->gp_a[i] = va_arg(ap, uint64_t); 83 va_end(ap); 84 85 /* Set the stack */ 86 gp->gp_sp = STACKALIGN(ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size); 87 /* Arrange for return via the trampoline code. */ 88 gp->gp_sepc = (__register_t)_ctx_start; 89 gp->gp_s[0] = (__register_t)func; 90 gp->gp_s[1] = (__register_t)ucp; 91 } 92