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b4e9c9549f
Two new helpers: given a process and regset, dump into a buffer. regset_get() takes a buffer and size, regset_get_alloc() takes size and allocates a buffer. Return value in both cases is the amount of data actually dumped in case of success or -E... on error. In both cases the size is capped by regset->n * regset->size, so ->get() is called with offset 0 and size no more than what regset expects. binfmt_elf.c callers of ->get() are switched to using those; the other caller (copy_regset_to_user()) will need some preparations to switch. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/regset.h>
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static int __regset_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int size,
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void **data)
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{
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void *p = *data, *to_free = NULL;
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int res;
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if (!regset->get)
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return -EOPNOTSUPP;
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if (size > regset->n * regset->size)
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size = regset->n * regset->size;
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if (!p) {
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to_free = p = kzalloc(size, GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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}
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res = regset->get(target, regset, 0, size, p, NULL);
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if (unlikely(res < 0)) {
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kfree(to_free);
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return res;
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}
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*data = p;
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if (regset->get_size) { // arm64-only kludge, will go away
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unsigned max_size = regset->get_size(target, regset);
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if (size > max_size)
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size = max_size;
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}
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return size;
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}
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int regset_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int size,
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void *data)
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{
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return __regset_get(target, regset, size, &data);
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}
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EXPORT_SYMBOL(regset_get);
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int regset_get_alloc(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int size,
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void **data)
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{
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*data = NULL;
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return __regset_get(target, regset, size, data);
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}
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EXPORT_SYMBOL(regset_get_alloc);
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