diff options
Diffstat (limited to 'lib/libc/alpha/gen/makecontext.c')
| -rw-r--r-- | lib/libc/alpha/gen/makecontext.c | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/lib/libc/alpha/gen/makecontext.c b/lib/libc/alpha/gen/makecontext.c deleted file mode 100644 index bc8ea03..0000000 --- a/lib/libc/alpha/gen/makecontext.c +++ /dev/null @@ -1,172 +0,0 @@ -/* - * Copyright (c) 2001 Daniel M. Eischen <deischen@freebsd.org> - * All rights reserved. - * - * 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. Neither the name of the author nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * 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 <sys/signal.h> - -#include <errno.h> -#include <stdarg.h> -#include <stdlib.h> -#include <ucontext.h> -#include <unistd.h> - - -/* Prototypes */ -extern void _ctx_start(int argc, ...); - - -__weak_reference(__makecontext, makecontext); - -void -_ctx_done (ucontext_t *ucp) -{ - if (ucp->uc_link == NULL) - exit(0); - else { - /* - * Since this context has finished, don't allow it - * to be restarted without being reinitialized (via - * setcontext or swapcontext). - */ - ucp->uc_mcontext.mc_format = 0; - - /* Set context to next one in link */ - /* XXX - what to do for error, abort? */ - setcontext((const ucontext_t *)ucp->uc_link); - abort(); /* should never get here */ - } -} - -void -__makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...) -{ - va_list ap; - char *stack_top; - intptr_t *argp; - int i; - - if (ucp == NULL) - return; - else if ((ucp->uc_stack.ss_sp == NULL) || - (ucp->uc_stack.ss_size < MINSIGSTKSZ)) { - /* - * This should really return -1 with errno set to ENOMEM - * or something, but the spec says that makecontext is - * a void function. At least make sure that the context - * isn't valid so it can't be used without an error. - */ - ucp->uc_mcontext.mc_format = 0; - } - /* XXX - Do we want to sanity check argc? */ - else if ((argc < 0) || (argc > NCARGS)) { - ucp->uc_mcontext.mc_format = 0; - } - /* - * Make sure the context is valid. For now, we only allow - * trapframe format contexts to be used for makecontext. - */ - else if (ucp->uc_mcontext.mc_format == _MC_REV0_TRAPFRAME) { - /* - * Alpha passes the first 6 parameters in registers and - * remaining parameters on the stack. Set up the context - * accordingly, with the user start routine in register - * S0, and the context start wrapper (_ctx_start) in the - * program counter and return address. The context must - * be in trapframe format. - * - * Note: The context start wrapper needs to retrieve the - * ucontext pointer. Place this in register S1 - * which must be saved by the callee. - */ - stack_top = (char *)(ucp->uc_stack.ss_sp + - ucp->uc_stack.ss_size - sizeof(double)); - stack_top = (char *)ALIGN(stack_top); - - /* - * Adjust top of stack to allow for any additional integer - * arguments beyond 6. - */ - if (argc > 6) - stack_top = stack_top - (sizeof(intptr_t) * (argc - 6)); - - argp = (intptr_t *)stack_top; - - va_start(ap, argc); - for (i = 0; i < argc; i++) { - switch (i) { - case 0: ucp->uc_mcontext.mc_regs[FRAME_A0] = - (unsigned long)va_arg(ap, intptr_t); - break; - - case 1: ucp->uc_mcontext.mc_regs[FRAME_A1] = - (unsigned long)va_arg(ap, intptr_t); - break; - - case 2: ucp->uc_mcontext.mc_regs[FRAME_A2] = - (unsigned long)va_arg(ap, intptr_t); - break; - - case 3: ucp->uc_mcontext.mc_regs[FRAME_A3] = - (unsigned long)va_arg(ap, intptr_t); - break; - - case 4: ucp->uc_mcontext.mc_regs[FRAME_A4] = - (unsigned long)va_arg(ap, intptr_t); - break; - - case 5: ucp->uc_mcontext.mc_regs[FRAME_A5] = - (unsigned long)va_arg(ap, intptr_t); - break; - - default: - *argp = va_arg(ap, intptr_t); - argp++; - break; - } - } - va_end(ap); - - /* - * The start routine and ucontext are placed in registers - * S0 and S1 respectively. - */ - ucp->uc_mcontext.mc_regs[FRAME_S0] = (unsigned long)start; - ucp->uc_mcontext.mc_regs[FRAME_S1] = (unsigned long)ucp; - - /* - * Set the machine context to point to the top of the stack, - * and the program counter and return address to the context - * start wrapper. - */ - ucp->uc_mcontext.mc_regs[FRAME_SP] = (unsigned long)stack_top; - ucp->uc_mcontext.mc_regs[FRAME_PC] = (unsigned long)_ctx_start; - ucp->uc_mcontext.mc_regs[FRAME_RA] = (unsigned long)_ctx_start; - ucp->uc_mcontext.mc_regs[FRAME_T12] = (unsigned long)_ctx_start; - } -} |
