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powerpc: Define and use get_user_instr() et. al.

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Define specialised get_user_instr(), __get_user_instr() and
__get_user_instr_inatomic() macros for reading instructions from user
and/or kernel space.

Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Reviewed-by: Alistair Popple <alistair@popple.id.au>
[mpe: Squash in addition of get_user_instr() & __user annotations]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-17-jniethe5@gmail.com
This commit is contained in:
Jordan Niethe
2020-05-06 13:40:36 +10:00
committed by Michael Ellerman
parent a8646f43ba
commit 5249385ad7
4 changed files with 12 additions and 3 deletions
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arch/powerpc/kernel/vecemu.c
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@@ -266,7 +266,7 @@ int emulate_altivec(struct pt_regs *regs)
unsigned int va, vb, vc, vd;
vector128 *vrs;
if (get_user(instr.val, (unsigned int __user *)regs->nip))
if (get_user_instr(instr, (void __user *)regs->nip))
return -EFAULT;
word = ppc_inst_val(instr);