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powerpc: Make probe_kernel_read_inst() common to PPC32 and PPC64

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We have two independant versions of probe_kernel_read_inst(), one for
PPC32 and one for PPC64.

The PPC32 is identical to the first part of the PPC64 version.
The remaining part of PPC64 version is not relevant for PPC32, but
not contradictory, so we can easily have a common function with
the PPC64 part opted out via a IS_ENABLED(CONFIG_PPC64).

The only need is to add a version of ppc_inst_prefix() for PPC32.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f7b9dfddef3b3760182c7e5466356c121a293dc9.1618405715.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-04-14 13:08:41 +00:00 committed by Michael Ellerman
parent 6ac7897f08
commit 6449078d50
2 changed files with 3 additions and 16 deletions
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2
arch/powerpc/include/asm/inst.h
View File

@ -102,6 +102,8 @@ static inline bool ppc_inst_equal(struct ppc_inst x, struct ppc_inst y)
#define ppc_inst(x) ((struct ppc_inst){ .val = x })
#define ppc_inst_prefix(x, y) ppc_inst(x)
static inline bool ppc_inst_prefixed(struct ppc_inst x)
{
return false;

17
arch/powerpc/lib/inst.c
View File

@ -8,7 +8,6 @@
#include <asm/inst.h>
#include <asm/ppc-opcode.h>
#ifdef CONFIG_PPC64
int probe_kernel_read_inst(struct ppc_inst *inst,
struct ppc_inst *src)
{
@ -18,7 +17,7 @@ int probe_kernel_read_inst(struct ppc_inst *inst,
err = copy_from_kernel_nofault(&val, src, sizeof(val));
if (err)
return err;
if (get_op(val) == OP_PREFIX) {
if (IS_ENABLED(CONFIG_PPC64) && get_op(val) == OP_PREFIX) {
err = copy_from_kernel_nofault(&suffix, (void *)src + 4, 4);
*inst = ppc_inst_prefix(val, suffix);
} else {
@ -26,17 +25,3 @@ int probe_kernel_read_inst(struct ppc_inst *inst,
}
return err;
}
#else /* !CONFIG_PPC64 */
int probe_kernel_read_inst(struct ppc_inst *inst,
struct ppc_inst *src)
{
unsigned int val;
int err;
err = copy_from_kernel_nofault(&val, src, sizeof(val));
if (!err)
*inst = ppc_inst(val);
return err;
}
#endif /* CONFIG_PPC64 */