[16] | 1 | /*************************************************************************** |
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| 2 | * |
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| 3 | * Copyright (C) 2001 International Business Machines |
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| 4 | * All rights reserved. |
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| 5 | * |
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| 6 | * This file is part of the GPFS mmfslinux kernel module. |
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| 7 | * |
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| 8 | * Redistribution and use in source and binary forms, with or without |
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| 9 | * modification, are permitted provided that the following conditions |
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| 10 | * are met: |
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| 11 | * |
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| 12 | * 1. Redistributions of source code must retain the above copyright notice, |
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| 13 | * this list of conditions and the following disclaimer. |
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| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 15 | * notice, this list of conditions and the following disclaimer in the |
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| 16 | * documentation and/or other materials provided with the distribution. |
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| 17 | * 3. The name of the author may not be used to endorse or promote products |
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| 18 | * derived from this software without specific prior written |
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| 19 | * permission. |
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| 20 | * |
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 22 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 23 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 24 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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| 26 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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| 27 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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| 28 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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| 29 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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| 30 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 31 | * |
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| 32 | *************************************************************************** */ |
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| 33 | /* @(#)39 1.2 src/avs/fs/mmfs/ts/kernext/gpl-linux/x86_64/ss_x86_64.c, mmfs, avs_rgpfs24, rgpfs240610b 9/15/04 23:29:31 */ |
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| 34 | /* |
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| 35 | * Implementation of shared segment for GPFS daemon and GPFS kernel code. |
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| 36 | * |
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| 37 | */ |
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| 38 | |
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| 39 | #include <Shark-gpl.h> |
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| 40 | #include <linux/types.h> |
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| 41 | #include <linux/version.h> |
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| 42 | #include <linux/kernel.h> |
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| 43 | #include <linux/module.h> |
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| 44 | #include <linux/errno.h> |
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| 45 | #include <linux/slab.h> |
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| 46 | #include <linux/smp_lock.h> |
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| 47 | #include <linux/proc_fs.h> |
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| 48 | #include <linux/mm.h> |
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| 49 | #include <linux/fs.h> |
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| 50 | #include <linux/file.h> |
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| 51 | #include <linux/binfmts.h> |
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| 52 | #include <linux/signal.h> |
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| 53 | #include <linux/vmalloc.h> |
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| 54 | |
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| 55 | #include <asm/pgtable.h> |
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| 56 | #include <asm/pgalloc.h> |
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| 57 | #include <asm/io.h> |
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| 58 | #include <asm/uaccess.h> |
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| 59 | #include <asm/user.h> |
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| 60 | #include <asm/mman.h> |
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| 61 | #include <asm/atomic.h> |
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| 62 | #include <asm/ptrace.h> |
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| 63 | |
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| 64 | #include <verdep.h> |
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| 65 | #include <arch-gpl.h> |
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| 66 | |
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| 67 | /* |
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| 68 | * Function spec: |
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| 69 | * |
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| 70 | * Return a user_regs_struct <sys/user.h> for a particular thread |
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| 71 | * |
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| 72 | * For a particular task id, cycle thru each task via |
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| 73 | * for_each_task(task_id) |
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| 74 | * |
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| 75 | * Look for the requested thread |
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| 76 | * task_structP->pid |
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| 77 | * |
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| 78 | * Some of the registers are found within the thread_struct sub structure |
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| 79 | * pointed to by the task structure, see include/asm-x86_64/processor.h |
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| 80 | * |
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| 81 | * All the other regs are found via the stack pointer thread.rsp0 |
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| 82 | */ |
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| 83 | |
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| 84 | int |
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| 85 | kxSaveThreadInfo(int tid, void* regP) |
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| 86 | { |
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| 87 | struct task_struct *g,*t; |
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| 88 | int rc = ENOENT; |
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| 89 | struct pt_regs *kregsP; |
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| 90 | struct user_regs_struct userRegs; |
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| 91 | long data, i; |
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| 92 | |
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| 93 | read_lock(&tasklist_lock); |
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| 94 | DO_EACH_THREAD(g,t) |
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| 95 | { |
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| 96 | if (t->pid != tid) |
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| 97 | continue; |
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| 98 | |
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| 99 | userRegs.fs = t->thread.fs; |
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| 100 | userRegs.gs = t->thread.gs; |
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| 101 | userRegs.es = t->thread.es; |
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| 102 | userRegs.ds = t->thread.ds; |
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| 103 | userRegs.fs_base = t->thread.fsindex; /* ??? */ |
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| 104 | userRegs.gs_base = t->thread.gsindex; /* ??? */ |
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| 105 | |
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| 106 | /* Not really sure if this is always true, can't find any docs for this, |
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| 107 | * but it appears to work */ |
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| 108 | kregsP = (struct pt_regs*)(t->thread.rsp0 - sizeof(struct pt_regs)); |
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| 109 | |
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| 110 | /* user_regs_struct is identical to pt_regs up to the size of pt_regs */ |
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| 111 | memcpy(&userRegs, kregsP, sizeof(struct pt_regs)); |
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| 112 | |
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| 113 | /* I'm not proud of this code. I don't know why it works, |
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| 114 | * but it does. I'll have to figure out why one of these days */ |
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| 115 | userRegs.rsp = t->thread.userrsp; |
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| 116 | userRegs.r15 = kregsP->rbx; |
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| 117 | userRegs.r14 = kregsP->rbp; |
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| 118 | userRegs.r13 = kregsP->r12; |
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| 119 | userRegs.r12 = kregsP->r13; |
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| 120 | userRegs.rbp = kregsP->r14; |
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| 121 | userRegs.rbx = kregsP->r15; |
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| 122 | |
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| 123 | rc = 0; |
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| 124 | goto found_it; |
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| 125 | } WHILE_EACH_THREAD(g,t); |
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| 126 | found_it: |
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| 127 | read_unlock(&tasklist_lock); |
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| 128 | |
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| 129 | if (rc == 0) |
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| 130 | copy_to_user(regP, &userRegs, sizeof(struct user_regs_struct)); |
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| 131 | return rc; |
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| 132 | } |
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