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Linux/arch/powerpc/platforms/cell/spufs/coredump.c

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  1 /*
  2  * SPU core dump code
  3  *
  4  * (C) Copyright 2006 IBM Corp.
  5  *
  6  * Author: Dwayne Grant McConnell <decimal@us.ibm.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2, or (at your option)
 11  * any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 21  */
 22 
 23 #include <linux/elf.h>
 24 #include <linux/file.h>
 25 #include <linux/fdtable.h>
 26 #include <linux/fs.h>
 27 #include <linux/gfp.h>
 28 #include <linux/list.h>
 29 #include <linux/syscalls.h>
 30 #include <linux/coredump.h>
 31 #include <linux/binfmts.h>
 32 
 33 #include <linux/uaccess.h>
 34 
 35 #include "spufs.h"
 36 
 37 static ssize_t do_coredump_read(int num, struct spu_context *ctx, void *buffer,
 38                                 size_t size, loff_t *off)
 39 {
 40         u64 data;
 41         int ret;
 42 
 43         if (spufs_coredump_read[num].read)
 44                 return spufs_coredump_read[num].read(ctx, buffer, size, off);
 45 
 46         data = spufs_coredump_read[num].get(ctx);
 47         ret = snprintf(buffer, size, "0x%.16llx", data);
 48         if (ret >= size)
 49                 return size;
 50         return ++ret; /* count trailing NULL */
 51 }
 52 
 53 static int spufs_ctx_note_size(struct spu_context *ctx, int dfd)
 54 {
 55         int i, sz, total = 0;
 56         char *name;
 57         char fullname[80];
 58 
 59         for (i = 0; spufs_coredump_read[i].name != NULL; i++) {
 60                 name = spufs_coredump_read[i].name;
 61                 sz = spufs_coredump_read[i].size;
 62 
 63                 sprintf(fullname, "SPU/%d/%s", dfd, name);
 64 
 65                 total += sizeof(struct elf_note);
 66                 total += roundup(strlen(fullname) + 1, 4);
 67                 total += roundup(sz, 4);
 68         }
 69 
 70         return total;
 71 }
 72 
 73 static int match_context(const void *v, struct file *file, unsigned fd)
 74 {
 75         struct spu_context *ctx;
 76         if (file->f_op != &spufs_context_fops)
 77                 return 0;
 78         ctx = SPUFS_I(file_inode(file))->i_ctx;
 79         if (ctx->flags & SPU_CREATE_NOSCHED)
 80                 return 0;
 81         return fd + 1;
 82 }
 83 
 84 /*
 85  * The additional architecture-specific notes for Cell are various
 86  * context files in the spu context.
 87  *
 88  * This function iterates over all open file descriptors and sees
 89  * if they are a directory in spufs.  In that case we use spufs
 90  * internal functionality to dump them without needing to actually
 91  * open the files.
 92  */
 93 /*
 94  * descriptor table is not shared, so files can't change or go away.
 95  */
 96 static struct spu_context *coredump_next_context(int *fd)
 97 {
 98         struct file *file;
 99         int n = iterate_fd(current->files, *fd, match_context, NULL);
100         if (!n)
101                 return NULL;
102         *fd = n - 1;
103         file = fcheck(*fd);
104         return SPUFS_I(file_inode(file))->i_ctx;
105 }
106 
107 int spufs_coredump_extra_notes_size(void)
108 {
109         struct spu_context *ctx;
110         int size = 0, rc, fd;
111 
112         fd = 0;
113         while ((ctx = coredump_next_context(&fd)) != NULL) {
114                 rc = spu_acquire_saved(ctx);
115                 if (rc)
116                         break;
117                 rc = spufs_ctx_note_size(ctx, fd);
118                 spu_release_saved(ctx);
119                 if (rc < 0)
120                         break;
121 
122                 size += rc;
123 
124                 /* start searching the next fd next time */
125                 fd++;
126         }
127 
128         return size;
129 }
130 
131 static int spufs_arch_write_note(struct spu_context *ctx, int i,
132                                   struct coredump_params *cprm, int dfd)
133 {
134         loff_t pos = 0;
135         int sz, rc, total = 0;
136         const int bufsz = PAGE_SIZE;
137         char *name;
138         char fullname[80], *buf;
139         struct elf_note en;
140         size_t skip;
141 
142         buf = (void *)get_zeroed_page(GFP_KERNEL);
143         if (!buf)
144                 return -ENOMEM;
145 
146         name = spufs_coredump_read[i].name;
147         sz = spufs_coredump_read[i].size;
148 
149         sprintf(fullname, "SPU/%d/%s", dfd, name);
150         en.n_namesz = strlen(fullname) + 1;
151         en.n_descsz = sz;
152         en.n_type = NT_SPU;
153 
154         if (!dump_emit(cprm, &en, sizeof(en)))
155                 goto Eio;
156 
157         if (!dump_emit(cprm, fullname, en.n_namesz))
158                 goto Eio;
159 
160         if (!dump_align(cprm, 4))
161                 goto Eio;
162 
163         do {
164                 rc = do_coredump_read(i, ctx, buf, bufsz, &pos);
165                 if (rc > 0) {
166                         if (!dump_emit(cprm, buf, rc))
167                                 goto Eio;
168                         total += rc;
169                 }
170         } while (rc == bufsz && total < sz);
171 
172         if (rc < 0)
173                 goto out;
174 
175         skip = roundup(cprm->pos - total + sz, 4) - cprm->pos;
176         if (!dump_skip(cprm, skip))
177                 goto Eio;
178 
179         rc = 0;
180 out:
181         free_page((unsigned long)buf);
182         return rc;
183 Eio:
184         free_page((unsigned long)buf);
185         return -EIO;
186 }
187 
188 int spufs_coredump_extra_notes_write(struct coredump_params *cprm)
189 {
190         struct spu_context *ctx;
191         int fd, j, rc;
192 
193         fd = 0;
194         while ((ctx = coredump_next_context(&fd)) != NULL) {
195                 rc = spu_acquire_saved(ctx);
196                 if (rc)
197                         return rc;
198 
199                 for (j = 0; spufs_coredump_read[j].name != NULL; j++) {
200                         rc = spufs_arch_write_note(ctx, j, cprm, fd);
201                         if (rc) {
202                                 spu_release_saved(ctx);
203                                 return rc;
204                         }
205                 }
206 
207                 spu_release_saved(ctx);
208 
209                 /* start searching the next fd next time */
210                 fd++;
211         }
212 
213         return 0;
214 }
215 

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