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-rw-r--r--lib/libc/amd64/gen/makecontext.c107
1 files changed, 0 insertions, 107 deletions
diff --git a/lib/libc/amd64/gen/makecontext.c b/lib/libc/amd64/gen/makecontext.c
deleted file mode 100644
index 15f10b5..0000000
--- a/lib/libc/amd64/gen/makecontext.c
+++ /dev/null
@@ -1,107 +0,0 @@
-/*
- * Copyright (c) 2003 Marcel Moolenaar
- * 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. 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 ``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 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/types.h>
-#include <sys/ucontext.h>
-#include <stdarg.h>
-#include <stdlib.h>
-
-typedef void (*func_t)(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t,
- uint64_t);
-
-/* Prototypes */
-static void makectx_wrapper(ucontext_t *ucp, func_t func, uint64_t *args);
-
-__weak_reference(__makecontext, makecontext);
-
-void
-__makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...)
-{
- uint64_t *args;
- uint64_t *sp;
- va_list ap;
- int i;
-
- /* A valid context is required. */
- if ((ucp == NULL) || (ucp->uc_mcontext.mc_len != sizeof(mcontext_t)))
- return;
- else if ((argc < 0) || (argc > 6) || (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_len = 0;
- return;
- }
-
- /* Align the stack to 16 bytes. */
- sp = (uint64_t *)(ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
- sp = (uint64_t *)((uint64_t)sp & ~15UL);
-
- /* Allocate space for a maximum of 6 arguments on the stack. */
- args = sp - 6;
-
- /*
- * Account for arguments on stack and do the funky C entry alignment.
- * This means that we need an 8-byte-odd alignment since the ABI expects
- * the return address to be pushed, thus breaking the 16 byte alignment.
- */
- sp -= 7;
-
- /* Add the arguments: */
- va_start(ap, argc);
- for (i = 0; i < argc; i++)
- args[i] = va_arg(ap, uint64_t);
- va_end(ap);
- for (i = argc; i < 6; i++)
- args[i] = 0;
-
- ucp->uc_mcontext.mc_rdi = (register_t)ucp;
- ucp->uc_mcontext.mc_rsi = (register_t)start;
- ucp->uc_mcontext.mc_rdx = (register_t)args;
- ucp->uc_mcontext.mc_rbp = 0;
- ucp->uc_mcontext.mc_rbx = (register_t)sp;
- ucp->uc_mcontext.mc_rsp = (register_t)sp;
- ucp->uc_mcontext.mc_rip = (register_t)makectx_wrapper;
-}
-
-static void
-makectx_wrapper(ucontext_t *ucp, func_t func, uint64_t *args)
-{
- (*func)(args[0], args[1], args[2], args[3], args[4], args[5]);
- if (ucp->uc_link == NULL)
- exit(0);
- setcontext((const ucontext_t *)ucp->uc_link);
- /* should never get here */
- abort();
- /* NOTREACHED */
-}
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