4 * (C) Copyright 2006 IBM Corp.
6 * Author: Dwayne Grant McConnell <decimal@us.ibm.com>
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)
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.
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.
23 #include <linux/elf.h>
24 #include <linux/file.h>
25 #include <linux/fdtable.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>
33 #include <asm/uaccess.h>
37 static ssize_t do_coredump_read(int num, struct spu_context *ctx, void *buffer,
38 size_t size, loff_t *off)
43 if (spufs_coredump_read[num].read)
44 return spufs_coredump_read[num].read(ctx, buffer, size, off);
46 data = spufs_coredump_read[num].get(ctx);
47 ret = snprintf(buffer, size, "0x%.16llx", data);
50 return ++ret; /* count trailing NULL */
53 static int spufs_ctx_note_size(struct spu_context *ctx, int dfd)
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;
63 sprintf(fullname, "SPU/%d/%s", dfd, name);
65 total += sizeof(struct elf_note);
66 total += roundup(strlen(fullname) + 1, 4);
67 total += roundup(sz, 4);
73 static int match_context(const void *v, struct file *file, unsigned fd)
75 struct spu_context *ctx;
76 if (file->f_op != &spufs_context_fops)
78 ctx = SPUFS_I(file_inode(file))->i_ctx;
79 if (ctx->flags & SPU_CREATE_NOSCHED)
85 * The additional architecture-specific notes for Cell are various
86 * context files in the spu context.
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
94 * descriptor table is not shared, so files can't change or go away.
96 static struct spu_context *coredump_next_context(int *fd)
99 int n = iterate_fd(current->files, *fd, match_context, NULL);
104 return SPUFS_I(file_inode(file))->i_ctx;
107 int spufs_coredump_extra_notes_size(void)
109 struct spu_context *ctx;
110 int size = 0, rc, fd;
113 while ((ctx = coredump_next_context(&fd)) != NULL) {
114 rc = spu_acquire_saved(ctx);
117 rc = spufs_ctx_note_size(ctx, fd);
118 spu_release_saved(ctx);
124 /* start searching the next fd next time */
131 static int spufs_arch_write_note(struct spu_context *ctx, int i,
132 struct coredump_params *cprm, int dfd)
135 int sz, rc, total = 0;
136 const int bufsz = PAGE_SIZE;
138 char fullname[80], *buf;
142 buf = (void *)get_zeroed_page(GFP_KERNEL);
146 name = spufs_coredump_read[i].name;
147 sz = spufs_coredump_read[i].size;
149 sprintf(fullname, "SPU/%d/%s", dfd, name);
150 en.n_namesz = strlen(fullname) + 1;
154 if (!dump_emit(cprm, &en, sizeof(en)))
157 if (!dump_emit(cprm, fullname, en.n_namesz))
160 if (!dump_align(cprm, 4))
164 rc = do_coredump_read(i, ctx, buf, bufsz, &pos);
166 if (!dump_emit(cprm, buf, rc))
170 } while (rc == bufsz && total < sz);
175 skip = roundup(cprm->pos - total + sz, 4) - cprm->pos;
176 if (!dump_skip(cprm, skip))
179 free_page((unsigned long)buf);
182 free_page((unsigned long)buf);
186 int spufs_coredump_extra_notes_write(struct coredump_params *cprm)
188 struct spu_context *ctx;
192 while ((ctx = coredump_next_context(&fd)) != NULL) {
193 rc = spu_acquire_saved(ctx);
197 for (j = 0; spufs_coredump_read[j].name != NULL; j++) {
198 rc = spufs_arch_write_note(ctx, j, cprm, fd);
200 spu_release_saved(ctx);
205 spu_release_saved(ctx);
207 /* start searching the next fd next time */