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69d4d6e5fd
'struct ppc_inst' is an internal representation of an instruction, but in-memory instructions are and will remain a table of 'u32' forever. Replace all 'struct ppc_inst *' used for locating an instruction in memory by 'u32 *'. This removes a lot of undue casts to 'struct ppc_inst *'. It also helps locating ab-use of 'struct ppc_inst' dereference. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> [mpe: Fix ppc_inst_next(), use u32 instead of unsigned int] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/7062722b087228e42cbd896e39bfdf526d6a340a.1621516826.git.christophe.leroy@csgroup.eu
30 lines
717 B
C
30 lines
717 B
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/uaccess.h>
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#include <linux/kernel.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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bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
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{
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return is_kernel_addr((unsigned long)unsafe_src);
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}
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int copy_inst_from_kernel_nofault(struct ppc_inst *inst, u32 *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 (IS_ENABLED(CONFIG_PPC64) && get_op(val) == OP_PREFIX) {
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err = copy_from_kernel_nofault(&suffix, src + 1, sizeof(suffix));
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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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