[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 | /* @(#)85 1.24.1.1 src/avs/fs/mmfs/ts/kernext/gpl-linux/i386/ss_i386.c, mmfs, avs_rgpfs24, rgpfs24s007a 10/8/06 03:17:10 */ |
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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/config.h> |
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| 41 | #include <linux/types.h> |
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| 42 | #include <linux/version.h> |
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| 43 | #include <linux/kernel.h> |
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| 44 | #include <linux/module.h> |
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| 45 | #include <linux/errno.h> |
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| 46 | #include <linux/slab.h> |
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| 47 | #include <linux/smp_lock.h> |
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| 48 | #include <linux/proc_fs.h> |
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| 49 | #include <linux/mm.h> |
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| 50 | #include <linux/fs.h> |
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| 51 | #include <linux/file.h> |
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| 52 | #include <linux/binfmts.h> |
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| 53 | #include <linux/signal.h> |
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| 54 | #include <linux/vmalloc.h> |
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| 55 | |
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| 56 | #include <asm/pgtable.h> |
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| 57 | #include <asm/pgalloc.h> |
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| 58 | #include <asm/io.h> |
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| 59 | #include <asm/uaccess.h> |
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| 60 | #include <asm/user.h> |
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| 61 | #include <asm/mman.h> |
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| 62 | #include <asm/atomic.h> |
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| 63 | #include <asm/ptrace.h> |
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| 64 | |
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| 65 | #include <verdep.h> |
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| 66 | #include <arch-gpl.h> |
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| 67 | |
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| 68 | /* |
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| 69 | * Function spec: |
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| 70 | * |
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| 71 | * Return a user_regs_struct <sys/user.h> for a particular thread |
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| 72 | * |
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| 73 | * For a particular task id, cycle thru each task via |
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| 74 | * for_each_task(task_id) |
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| 75 | * |
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| 76 | * Look for the requested thread |
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| 77 | * task_structP->pid |
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| 78 | * |
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| 79 | * A couple of the registers are found within the thread sub structure |
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| 80 | * pointed to by the task structure. |
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| 81 | * task_structP->thread.fs |
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| 82 | * task_structP->thread.gs |
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| 83 | * |
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| 84 | * All the other regs are found via the stack pointer thread.esp0 |
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| 85 | * The stack pointer points at the last element in a |
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| 86 | * struct pt_regs <linux/ptrace.h>. The elements of the pt_regs |
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| 87 | * grow down from the stack pointer offset. |
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| 88 | * |
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| 89 | * Thus if thread.esp0 is 0xC0000000 |
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| 90 | * pt_regs.ss 0xBFFFFFFC |
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| 91 | * pt_regs.esp 0xBFFFFFF8 |
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| 92 | * pt_regs.eflags 0xBFFFFFF4 |
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| 93 | * pt_regs.xcs 0xBFFFFFF0 |
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| 94 | * pt_regs.eip 0xBFFFFFEC |
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| 95 | * pt_regs.orig_eax 0xBFFFFFE8 |
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| 96 | * pt_regs.xes 0xBFFFFFE4 |
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| 97 | * pt_regs.xds 0xBFFFFFE0 |
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| 98 | * pt_regs.eax 0xBFFFFFDC |
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| 99 | * pt_regs.ebp 0xBFFFFFD8 |
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| 100 | * pt_regs.edi 0xBFFFFFD4 |
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| 101 | * pt_regs.esi 0xBFFFFFD0 |
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| 102 | * pt_regs.edx 0xBFFFFFCC |
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| 103 | * pt_regs.ecx 0xBFFFFFC8 |
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| 104 | * pt_regs.ebx 0xBFFFFFC4 |
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| 105 | */ |
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| 106 | |
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| 107 | int |
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| 108 | kxSaveThreadInfo(int tid, void* regP) |
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| 109 | { |
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| 110 | struct task_struct *g, *t; |
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| 111 | unsigned char *stackP; |
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| 112 | int rc = ENOENT; |
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| 113 | union |
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| 114 | { |
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| 115 | struct user_regs_struct userRegs; |
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| 116 | unsigned long regArray[0]; |
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| 117 | } u; |
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| 118 | |
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| 119 | #define STACKP(A) (*(unsigned long *)(stackP - \ |
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| 120 | (unsigned char *)(sizeof(struct pt_regs) - \ |
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| 121 | (long)&((struct pt_regs *)0)->A))) |
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| 122 | #define REGARRAY(A) \ |
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| 123 | u.regArray[(long)&(((struct user_regs_struct *)0)->A) / sizeof(long)] |
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| 124 | |
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| 125 | // read_lock(&tasklist_lock); |
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| 126 | rcu_read_lock(); |
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| 127 | |
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| 128 | DO_EACH_THREAD(g,t) |
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| 129 | { |
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| 130 | if (t->pid != tid) |
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| 131 | continue; |
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| 132 | |
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| 133 | REGARRAY(fs) = t->thread.fs; |
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| 134 | REGARRAY(gs) = t->thread.gs; |
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| 135 | |
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| 136 | stackP = (char *)t->thread.esp0; |
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| 137 | |
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| 138 | REGARRAY(ss) = STACKP(xss); |
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| 139 | REGARRAY(esp) = STACKP(esp); |
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| 140 | REGARRAY(eflags) = STACKP(eflags); |
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| 141 | REGARRAY(cs) = STACKP(xcs); |
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| 142 | REGARRAY(eip) = STACKP(eip); |
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| 143 | REGARRAY(orig_eax) = STACKP(orig_eax); |
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| 144 | REGARRAY(es) = STACKP(xes); |
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| 145 | REGARRAY(ds) = STACKP(xds); |
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| 146 | REGARRAY(eax) = STACKP(eax); |
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| 147 | REGARRAY(ebp) = STACKP(ebp); |
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| 148 | REGARRAY(edi) = STACKP(edi); |
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| 149 | REGARRAY(esi) = STACKP(esi); |
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| 150 | REGARRAY(edx) = STACKP(edx); |
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| 151 | REGARRAY(ecx) = STACKP(ecx); |
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| 152 | REGARRAY(ebx) = STACKP(ebx); |
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| 153 | |
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| 154 | rc = 0; |
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| 155 | goto found_it; |
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| 156 | } WHILE_EACH_THREAD(g,t); |
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| 157 | found_it: |
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| 158 | // read_unlock(&tasklist_lock); |
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| 159 | rcu_read_unlock(); |
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| 160 | |
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| 161 | if (rc == 0) |
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| 162 | rc = copy_to_user(regP, &u.userRegs, sizeof(struct user_regs_struct)); |
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| 163 | return rc; |
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| 164 | } |
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