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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c0ee37e85e
Better describe what these functions do. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2020, IBM Corporation.
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*/
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#include <linux/uaccess.h>
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#include <asm/disassemble.h>
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#include <asm/inst.h>
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#include <asm/ppc-opcode.h>
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#ifdef CONFIG_PPC64
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int probe_user_read_inst(struct ppc_inst *inst,
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struct ppc_inst __user *nip)
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{
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unsigned int val, suffix;
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int err;
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err = copy_from_user_nofault(&val, nip, sizeof(val));
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if (err)
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return err;
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if (get_op(val) == OP_PREFIX) {
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err = copy_from_user_nofault(&suffix, (void __user *)nip + 4, 4);
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*inst = ppc_inst_prefix(val, suffix);
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} else {
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*inst = ppc_inst(val);
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}
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return err;
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}
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int probe_kernel_read_inst(struct ppc_inst *inst,
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struct ppc_inst *src)
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{
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unsigned int val, suffix;
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int err;
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err = copy_from_kernel_nofault(&val, src, sizeof(val));
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if (err)
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return err;
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if (get_op(val) == OP_PREFIX) {
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err = copy_from_kernel_nofault(&suffix, (void *)src + 4, 4);
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*inst = ppc_inst_prefix(val, suffix);
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} else {
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*inst = ppc_inst(val);
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}
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return err;
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}
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#else /* !CONFIG_PPC64 */
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int probe_user_read_inst(struct ppc_inst *inst,
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struct ppc_inst __user *nip)
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{
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unsigned int val;
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int err;
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err = copy_from_user_nofault(&val, nip, sizeof(val));
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if (!err)
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*inst = ppc_inst(val);
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return err;
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}
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int probe_kernel_read_inst(struct ppc_inst *inst,
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struct ppc_inst *src)
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{
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unsigned int val;
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int err;
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err = copy_from_kernel_nofault(&val, src, sizeof(val));
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if (!err)
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*inst = ppc_inst(val);
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return err;
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}
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#endif /* CONFIG_PPC64 */
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