diff options
| author | br <br@FreeBSD.org> | 2016-01-17 15:21:23 +0000 |
|---|---|---|
| committer | br <br@FreeBSD.org> | 2016-01-17 15:21:23 +0000 |
| commit | e0daa8fb6535861d32643e7056fb5025d04e772e (patch) | |
| tree | dc2c17b47c2052a9bdd63857fff9be0a1be00232 /lib/libc/riscv/gen/makecontext.c | |
| parent | 7d0828c94e6533f7d0d139b0242cf16e417eab8b (diff) | |
| download | FreeBSD-src-e0daa8fb6535861d32643e7056fb5025d04e772e.zip FreeBSD-src-e0daa8fb6535861d32643e7056fb5025d04e772e.tar.gz | |
Bring in initial libc and libstand support for RISC-V.
Reviewed by: andrew, emaste, kib
Sponsored by: DARPA, AFRL
Sponsored by: HEIF5
Differential Revision: https://reviews.freebsd.org/D4943
Diffstat (limited to 'lib/libc/riscv/gen/makecontext.c')
| -rw-r--r-- | lib/libc/riscv/gen/makecontext.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/lib/libc/riscv/gen/makecontext.c b/lib/libc/riscv/gen/makecontext.c new file mode 100644 index 0000000..3633a5d --- /dev/null +++ b/lib/libc/riscv/gen/makecontext.c @@ -0,0 +1,91 @@ +/*- + * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com> + * All rights reserved. + * + * Portions of this software were developed by SRI International and the + * University of Cambridge Computer Laboratory under DARPA/AFRL contract + * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme. + * + * Portions of this software were developed by the University of Cambridge + * Computer Laboratory as part of the CTSRD Project, with support from the + * UK Higher Education Innovation Fund (HEIF). + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> + +#include <machine/riscvreg.h> + +#include <inttypes.h> +#include <stdarg.h> +#include <stdlib.h> +#include <ucontext.h> + +void _ctx_start(void); + +void +ctx_done(ucontext_t *ucp) +{ + + if (ucp->uc_link == NULL) { + exit(0); + } else { + setcontext((const ucontext_t *)ucp->uc_link); + abort(); + } +} + +__weak_reference(__makecontext, makecontext); + +void +__makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...) +{ + struct gpregs *gp; + va_list ap; + int i; + + /* A valid context is required. */ + if (ucp == NULL) + return; + + if ((argc < 0) || (argc > 8)) + return; + + gp = &ucp->uc_mcontext.mc_gpregs; + + va_start(ap, argc); + /* Pass up to eight arguments in a0-7. */ + for (i = 0; i < argc && i < 8; i++) + gp->gp_a[i] = va_arg(ap, uint64_t); + va_end(ap); + + /* Set the stack */ + gp->gp_sp = STACKALIGN(ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size); + /* Arrange for return via the trampoline code. */ + gp->gp_sepc = (__register_t)_ctx_start; + gp->gp_s[0] = (__register_t)func; + gp->gp_s[1] = (__register_t)ucp; +} |
