From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- kernel/regset.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 kernel/regset.c (limited to 'kernel/regset.c') diff --git a/kernel/regset.c b/kernel/regset.c new file mode 100644 index 000000000..586823786 --- /dev/null +++ b/kernel/regset.c @@ -0,0 +1,76 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include + +static int __regset_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int size, + void **data) +{ + void *p = *data, *to_free = NULL; + int res; + + if (!regset->regset_get) + return -EOPNOTSUPP; + if (size > regset->n * regset->size) + size = regset->n * regset->size; + if (!p) { + to_free = p = kzalloc(size, GFP_KERNEL); + if (!p) + return -ENOMEM; + } + res = regset->regset_get(target, regset, + (struct membuf){.p = p, .left = size}); + if (res < 0) { + kfree(to_free); + return res; + } + *data = p; + return size - res; +} + +int regset_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int size, + void *data) +{ + return __regset_get(target, regset, size, &data); +} +EXPORT_SYMBOL(regset_get); + +int regset_get_alloc(struct task_struct *target, + const struct user_regset *regset, + unsigned int size, + void **data) +{ + *data = NULL; + return __regset_get(target, regset, size, data); +} +EXPORT_SYMBOL(regset_get_alloc); + +/** + * copy_regset_to_user - fetch a thread's user_regset data into user memory + * @target: thread to be examined + * @view: &struct user_regset_view describing user thread machine state + * @setno: index in @view->regsets + * @offset: offset into the regset data, in bytes + * @size: amount of data to copy, in bytes + * @data: user-mode pointer to copy into + */ +int copy_regset_to_user(struct task_struct *target, + const struct user_regset_view *view, + unsigned int setno, + unsigned int offset, unsigned int size, + void __user *data) +{ + const struct user_regset *regset = &view->regsets[setno]; + void *buf; + int ret; + + ret = regset_get_alloc(target, regset, size, &buf); + if (ret > 0) + ret = copy_to_user(data, buf, ret) ? -EFAULT : 0; + kfree(buf); + return ret; +} -- cgit v1.2.3