/*
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* SPU core dump code
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*
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* (C) Copyright 2006 IBM Corp.
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*
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* Author: Dwayne Grant McConnell <decimal@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/elf.h>
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#include <linux/file.h>
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#include <linux/fdtable.h>
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#include <linux/fs.h>
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#include <linux/gfp.h>
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#include <linux/list.h>
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#include <linux/syscalls.h>
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#include <linux/coredump.h>
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#include <linux/binfmts.h>
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#include <linux/uaccess.h>
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#include "spufs.h"
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static ssize_t do_coredump_read(int num, struct spu_context *ctx, void *buffer,
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size_t size, loff_t *off)
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{
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u64 data;
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int ret;
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if (spufs_coredump_read[num].read)
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return spufs_coredump_read[num].read(ctx, buffer, size, off);
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data = spufs_coredump_read[num].get(ctx);
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ret = snprintf(buffer, size, "0x%.16llx", data);
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if (ret >= size)
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return size;
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return ++ret; /* count trailing NULL */
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}
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static int spufs_ctx_note_size(struct spu_context *ctx, int dfd)
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{
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int i, sz, total = 0;
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char *name;
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char fullname[80];
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for (i = 0; spufs_coredump_read[i].name != NULL; i++) {
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name = spufs_coredump_read[i].name;
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sz = spufs_coredump_read[i].size;
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sprintf(fullname, "SPU/%d/%s", dfd, name);
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total += sizeof(struct elf_note);
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total += roundup(strlen(fullname) + 1, 4);
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total += roundup(sz, 4);
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}
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return total;
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}
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static int match_context(const void *v, struct file *file, unsigned fd)
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{
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struct spu_context *ctx;
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if (file->f_op != &spufs_context_fops)
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return 0;
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ctx = SPUFS_I(file_inode(file))->i_ctx;
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if (ctx->flags & SPU_CREATE_NOSCHED)
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return 0;
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return fd + 1;
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}
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/*
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* The additional architecture-specific notes for Cell are various
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* context files in the spu context.
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*
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* This function iterates over all open file descriptors and sees
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* if they are a directory in spufs. In that case we use spufs
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* internal functionality to dump them without needing to actually
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* open the files.
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*/
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/*
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* descriptor table is not shared, so files can't change or go away.
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*/
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static struct spu_context *coredump_next_context(int *fd)
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{
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struct file *file;
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int n = iterate_fd(current->files, *fd, match_context, NULL);
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if (!n)
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return NULL;
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*fd = n - 1;
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file = fcheck(*fd);
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return SPUFS_I(file_inode(file))->i_ctx;
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}
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int spufs_coredump_extra_notes_size(void)
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{
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struct spu_context *ctx;
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int size = 0, rc, fd;
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fd = 0;
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while ((ctx = coredump_next_context(&fd)) != NULL) {
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rc = spu_acquire_saved(ctx);
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if (rc)
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break;
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rc = spufs_ctx_note_size(ctx, fd);
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spu_release_saved(ctx);
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if (rc < 0)
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break;
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size += rc;
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/* start searching the next fd next time */
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fd++;
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}
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return size;
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}
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static int spufs_arch_write_note(struct spu_context *ctx, int i,
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struct coredump_params *cprm, int dfd)
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{
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loff_t pos = 0;
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int sz, rc, total = 0;
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const int bufsz = PAGE_SIZE;
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char *name;
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char fullname[80], *buf;
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struct elf_note en;
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size_t skip;
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buf = (void *)get_zeroed_page(GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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name = spufs_coredump_read[i].name;
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sz = spufs_coredump_read[i].size;
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sprintf(fullname, "SPU/%d/%s", dfd, name);
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en.n_namesz = strlen(fullname) + 1;
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en.n_descsz = sz;
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en.n_type = NT_SPU;
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if (!dump_emit(cprm, &en, sizeof(en)))
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goto Eio;
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if (!dump_emit(cprm, fullname, en.n_namesz))
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goto Eio;
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if (!dump_align(cprm, 4))
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goto Eio;
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do {
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rc = do_coredump_read(i, ctx, buf, bufsz, &pos);
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if (rc > 0) {
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if (!dump_emit(cprm, buf, rc))
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goto Eio;
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total += rc;
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}
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} while (rc == bufsz && total < sz);
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if (rc < 0)
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goto out;
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skip = roundup(cprm->pos - total + sz, 4) - cprm->pos;
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if (!dump_skip(cprm, skip))
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goto Eio;
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rc = 0;
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out:
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free_page((unsigned long)buf);
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return rc;
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Eio:
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free_page((unsigned long)buf);
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return -EIO;
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}
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int spufs_coredump_extra_notes_write(struct coredump_params *cprm)
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{
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struct spu_context *ctx;
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int fd, j, rc;
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fd = 0;
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while ((ctx = coredump_next_context(&fd)) != NULL) {
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rc = spu_acquire_saved(ctx);
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if (rc)
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return rc;
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for (j = 0; spufs_coredump_read[j].name != NULL; j++) {
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rc = spufs_arch_write_note(ctx, j, cprm, fd);
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if (rc) {
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spu_release_saved(ctx);
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return rc;
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}
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}
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spu_release_saved(ctx);
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/* start searching the next fd next time */
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fd++;
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}
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return 0;
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}
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