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