124 lines
3.8 KiB
C
124 lines
3.8 KiB
C
/*
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* Copyright (c) 2003 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/ucontext.h>
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#include <machine/fpu.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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struct fdesc {
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uint64_t ip;
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uint64_t gp;
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};
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typedef void (*func_t)(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t,
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uint64_t, uint64_t, uint64_t);
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static __inline uint64_t *
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spill(uint64_t *bsp, uint64_t arg)
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{
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*bsp++ = arg;
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if (((intptr_t)bsp & 0x1ff) == 0x1f8)
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*bsp++ = 0;
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return (bsp);
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}
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static void
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ctx_wrapper(ucontext_t *ucp, func_t func, uint64_t *args)
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{
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(*func)(args[0], args[1], args[2], args[3], args[4], args[5], args[6],
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args[7]);
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if (ucp->uc_link == NULL)
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exit(0);
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setcontext((const ucontext_t *)ucp->uc_link);
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/* should never get here */
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abort();
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/* NOTREACHED */
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}
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__weak_reference(__makecontext, makecontext);
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void
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__makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
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{
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uint64_t *args, *bsp;
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va_list ap;
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int i;
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/*
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* Drop the ball completely if something's not right. We only
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* support general registers as arguments and not more than 8
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* of them. Things get hairy if we need to support FP registers
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* (alignment issues) or more than 8 arguments (stack based).
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*/
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if (argc < 0 || argc > 8 || ucp == NULL ||
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ucp->uc_stack.ss_sp == NULL || (ucp->uc_stack.ss_size & 15) ||
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((intptr_t)ucp->uc_stack.ss_sp & 15) ||
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ucp->uc_stack.ss_size < MINSIGSTKSZ)
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abort();
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/*
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* Copy the arguments of function 'func' onto the (memory) stack.
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* Always take up space for 8 arguments.
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*/
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va_start(ap, argc);
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args = (uint64_t*)(ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size) - 8;
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i = 0;
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while (i < argc)
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args[i++] = va_arg(ap, uint64_t);
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while (i < 8)
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args[i++] = 0;
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va_end(ap);
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/*
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* Push (spill) the arguments of the context wrapper onto the register
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* stack. They get loaded by the RSE on a context switch.
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*/
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bsp = (uint64_t*)ucp->uc_stack.ss_sp;
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bsp = spill(bsp, (intptr_t)ucp);
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bsp = spill(bsp, (intptr_t)func);
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bsp = spill(bsp, (intptr_t)args);
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/*
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* Setup the MD portion of the context.
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*/
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memset(&ucp->uc_mcontext, 0, sizeof(ucp->uc_mcontext));
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ucp->uc_mcontext.mc_special.sp = (intptr_t)args - 16;
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ucp->uc_mcontext.mc_special.bspstore = (intptr_t)bsp;
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ucp->uc_mcontext.mc_special.pfs = (3 << 7) | 3;
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ucp->uc_mcontext.mc_special.rsc = 0xf;
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ucp->uc_mcontext.mc_special.rp = ((struct fdesc*)ctx_wrapper)->ip;
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ucp->uc_mcontext.mc_special.gp = ((struct fdesc*)ctx_wrapper)->gp;
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ucp->uc_mcontext.mc_special.fpsr = IA64_FPSR_DEFAULT;
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}
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