1/* 2 * Copyright (c) 2006 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#include <sys/syscall.h> 36#include <machine/asmacros.h> 37#include <machine/psl.h> 38#include "assym.s" 39 40 /* 41 * The sysinit and sysuninit sections have to be read-write data 42 * sections, not read-only data sections. 43 */ 44 .section set_sysinit_set, "aw" 45 .section set_sysuninit_set, "aw" 46 47 .data 48 ALIGN_DATA /* just to be sure */ 49 50 /* 51 * Normally the startup code would begin here, but this is a 52 * virtual kernel so we just have a main() in platform/init.c 53 */ 54 55 .text 56/********************************************************************** 57 * 58 * Signal trampoline, copied to top of user stack 59 * 60 * arguments: %rdi, %rsi, %rdx, %rcx 61 */ 62NON_GPROF_ENTRY(sigcode) 63 call *SIGF_HANDLER(%rsp) /* call signal handler */ 64 lea SIGF_UC(%rsp),%rdi /* get ucontext_t */ 65 pushq $0 /* junk to fake return addr. */ 66 movq $SYS_sigreturn,%rax 67 syscall /* enter kernel with args */ 680: hlt /* trap priviliged instruction */ 69 jmp 0b 70 71 ALIGN_TEXT 72esigcode: 73 74/* void reset_dbregs() */ 75ENTRY(reset_dbregs) 76 movq $0x200,%rax /* the manual says that bit 10 must be set to 1 */ 77 movq %rax,%dr7 /* disable all breapoints first */ 78 movq $0,%rax 79 movq %rax,%dr0 80 movq %rax,%dr1 81 movq %rax,%dr2 82 movq %rax,%dr3 83 movq %rax,%dr6 84 ret 85END(reset_dbregs) 86 87 .data 88 .globl szsigcode 89szsigcode: 90 .long esigcode - sigcode 91