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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/module.h>
30#include <linux/syscalls.h>
31
32#include <asm/uaccess.h>
33
34#include "spufs.h"
35
36static ssize_t do_coredump_read(int num, struct spu_context *ctx, void *buffer,
37 size_t size, loff_t *off)
38{
39 u64 data;
40 int ret;
41
42 if (spufs_coredump_read[num].read)
43 return spufs_coredump_read[num].read(ctx, buffer, size, off);
44
45 data = spufs_coredump_read[num].get(ctx);
46 ret = snprintf(buffer, size, "0x%.16llx", data);
47 if (ret >= size)
48 return size;
49 return ++ret;
50}
51
52
53
54
55
56static int spufs_dump_write(struct file *file, const void *addr, int nr, loff_t *foffset)
57{
58 unsigned long limit = rlimit(RLIMIT_CORE);
59 ssize_t written;
60
61 if (*foffset + nr > limit)
62 return -EIO;
63
64 written = file->f_op->write(file, addr, nr, &file->f_pos);
65 *foffset += written;
66
67 if (written != nr)
68 return -EIO;
69
70 return 0;
71}
72
73static int spufs_dump_align(struct file *file, char *buf, loff_t new_off,
74 loff_t *foffset)
75{
76 int rc, size;
77
78 size = min((loff_t)PAGE_SIZE, new_off - *foffset);
79 memset(buf, 0, size);
80
81 rc = 0;
82 while (rc == 0 && new_off > *foffset) {
83 size = min((loff_t)PAGE_SIZE, new_off - *foffset);
84 rc = spufs_dump_write(file, buf, size, foffset);
85 }
86
87 return rc;
88}
89
90static int spufs_ctx_note_size(struct spu_context *ctx, int dfd)
91{
92 int i, sz, total = 0;
93 char *name;
94 char fullname[80];
95
96 for (i = 0; spufs_coredump_read[i].name != NULL; i++) {
97 name = spufs_coredump_read[i].name;
98 sz = spufs_coredump_read[i].size;
99
100 sprintf(fullname, "SPU/%d/%s", dfd, name);
101
102 total += sizeof(struct elf_note);
103 total += roundup(strlen(fullname) + 1, 4);
104 total += roundup(sz, 4);
105 }
106
107 return total;
108}
109
110
111
112
113
114
115
116
117
118
119static struct spu_context *coredump_next_context(int *fd)
120{
121 struct fdtable *fdt = files_fdtable(current->files);
122 struct file *file;
123 struct spu_context *ctx = NULL;
124
125 for (; *fd < fdt->max_fds; (*fd)++) {
126 if (!FD_ISSET(*fd, fdt->open_fds))
127 continue;
128
129 file = fcheck(*fd);
130
131 if (!file || file->f_op != &spufs_context_fops)
132 continue;
133
134 ctx = SPUFS_I(file->f_dentry->d_inode)->i_ctx;
135 if (ctx->flags & SPU_CREATE_NOSCHED)
136 continue;
137
138 break;
139 }
140
141 return ctx;
142}
143
144int spufs_coredump_extra_notes_size(void)
145{
146 struct spu_context *ctx;
147 int size = 0, rc, fd;
148
149 fd = 0;
150 while ((ctx = coredump_next_context(&fd)) != NULL) {
151 rc = spu_acquire_saved(ctx);
152 if (rc)
153 break;
154 rc = spufs_ctx_note_size(ctx, fd);
155 spu_release_saved(ctx);
156 if (rc < 0)
157 break;
158
159 size += rc;
160
161
162 fd++;
163 }
164
165 return size;
166}
167
168static int spufs_arch_write_note(struct spu_context *ctx, int i,
169 struct file *file, int dfd, loff_t *foffset)
170{
171 loff_t pos = 0;
172 int sz, rc, nread, total = 0;
173 const int bufsz = PAGE_SIZE;
174 char *name;
175 char fullname[80], *buf;
176 struct elf_note en;
177
178 buf = (void *)get_zeroed_page(GFP_KERNEL);
179 if (!buf)
180 return -ENOMEM;
181
182 name = spufs_coredump_read[i].name;
183 sz = spufs_coredump_read[i].size;
184
185 sprintf(fullname, "SPU/%d/%s", dfd, name);
186 en.n_namesz = strlen(fullname) + 1;
187 en.n_descsz = sz;
188 en.n_type = NT_SPU;
189
190 rc = spufs_dump_write(file, &en, sizeof(en), foffset);
191 if (rc)
192 goto out;
193
194 rc = spufs_dump_write(file, fullname, en.n_namesz, foffset);
195 if (rc)
196 goto out;
197
198 rc = spufs_dump_align(file, buf, roundup(*foffset, 4), foffset);
199 if (rc)
200 goto out;
201
202 do {
203 nread = do_coredump_read(i, ctx, buf, bufsz, &pos);
204 if (nread > 0) {
205 rc = spufs_dump_write(file, buf, nread, foffset);
206 if (rc)
207 goto out;
208 total += nread;
209 }
210 } while (nread == bufsz && total < sz);
211
212 if (nread < 0) {
213 rc = nread;
214 goto out;
215 }
216
217 rc = spufs_dump_align(file, buf, roundup(*foffset - total + sz, 4),
218 foffset);
219
220out:
221 free_page((unsigned long)buf);
222 return rc;
223}
224
225int spufs_coredump_extra_notes_write(struct file *file, loff_t *foffset)
226{
227 struct spu_context *ctx;
228 int fd, j, rc;
229
230 fd = 0;
231 while ((ctx = coredump_next_context(&fd)) != NULL) {
232 rc = spu_acquire_saved(ctx);
233 if (rc)
234 return rc;
235
236 for (j = 0; spufs_coredump_read[j].name != NULL; j++) {
237 rc = spufs_arch_write_note(ctx, j, file, fd, foffset);
238 if (rc) {
239 spu_release_saved(ctx);
240 return rc;
241 }
242 }
243
244 spu_release_saved(ctx);
245
246
247 fd++;
248 }
249
250 return 0;
251}
252