2020-05-06 11:40:26 +08:00
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _ASM_POWERPC_INST_H
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#define _ASM_POWERPC_INST_H
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2020-05-15 10:12:55 +08:00
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#include <asm/ppc-opcode.h>
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2021-03-11 01:46:44 +08:00
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#define ___get_user_instr(gu_op, dest, ptr) \
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({ \
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2021-05-20 21:50:40 +08:00
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long __gui_ret; \
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2021-05-20 21:50:39 +08:00
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u32 __user *__gui_ptr = (u32 __user *)ptr; \
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2021-11-30 01:49:38 +08:00
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ppc_inst_t __gui_inst; \
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2021-03-11 01:46:44 +08:00
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unsigned int __prefix, __suffix; \
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2021-05-20 21:50:38 +08:00
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\
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__chk_user_ptr(ptr); \
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2021-05-20 21:50:39 +08:00
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__gui_ret = gu_op(__prefix, __gui_ptr); \
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2021-03-11 01:46:44 +08:00
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if (__gui_ret == 0) { \
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2021-11-30 01:49:37 +08:00
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if (IS_ENABLED(CONFIG_PPC64) && (__prefix >> 26) == OP_PREFIX) { \
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2021-05-20 21:50:39 +08:00
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__gui_ret = gu_op(__suffix, __gui_ptr + 1); \
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2021-05-20 21:50:40 +08:00
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__gui_inst = ppc_inst_prefix(__prefix, __suffix); \
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2021-03-11 01:46:44 +08:00
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} else { \
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__gui_inst = ppc_inst(__prefix); \
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} \
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if (__gui_ret == 0) \
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(dest) = __gui_inst; \
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} \
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__gui_ret; \
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})
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2021-05-20 21:50:40 +08:00
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#define get_user_instr(x, ptr) ___get_user_instr(get_user, x, ptr)
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2021-03-11 01:46:44 +08:00
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2021-05-20 21:50:40 +08:00
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#define __get_user_instr(x, ptr) ___get_user_instr(__get_user, x, ptr)
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2021-03-11 01:46:44 +08:00
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2020-05-06 11:40:26 +08:00
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/*
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* Instruction data type for POWER
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*/
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2021-11-30 01:49:38 +08:00
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typedef struct {
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2020-05-06 11:40:31 +08:00
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u32 val;
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2020-05-15 10:12:55 +08:00
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#ifdef CONFIG_PPC64
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u32 suffix;
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#endif
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2021-11-30 01:49:38 +08:00
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} __packed ppc_inst_t;
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2020-05-06 11:40:26 +08:00
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2021-11-30 01:49:38 +08:00
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static inline u32 ppc_inst_val(ppc_inst_t x)
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2020-05-06 11:40:27 +08:00
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{
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2020-05-06 11:40:31 +08:00
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return x.val;
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2020-05-06 11:40:27 +08:00
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}
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2021-11-30 01:49:38 +08:00
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static inline int ppc_inst_primary_opcode(ppc_inst_t x)
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2020-05-06 11:40:37 +08:00
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{
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2020-05-15 10:12:55 +08:00
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return ppc_inst_val(x) >> 26;
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2020-05-06 11:40:37 +08:00
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}
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2021-11-30 01:49:38 +08:00
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#define ppc_inst(x) ((ppc_inst_t){ .val = (x) })
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2020-05-15 10:12:55 +08:00
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2021-05-20 21:50:46 +08:00
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#ifdef CONFIG_PPC64
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2021-11-30 01:49:38 +08:00
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#define ppc_inst_prefix(x, y) ((ppc_inst_t){ .val = (x), .suffix = (y) })
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2020-05-15 10:12:55 +08:00
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2021-11-30 01:49:38 +08:00
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static inline u32 ppc_inst_suffix(ppc_inst_t x)
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2020-05-06 11:40:28 +08:00
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{
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2020-05-15 10:12:55 +08:00
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return x.suffix;
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}
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2021-05-20 21:50:46 +08:00
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#else
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2021-11-30 01:49:37 +08:00
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#define ppc_inst_prefix(x, y) ((void)y, ppc_inst(x))
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2020-05-15 10:12:55 +08:00
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2021-11-30 01:49:38 +08:00
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static inline u32 ppc_inst_suffix(ppc_inst_t x)
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2020-05-15 10:12:55 +08:00
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{
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2021-05-20 21:50:46 +08:00
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return 0;
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2020-05-15 10:12:55 +08:00
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}
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2021-05-20 21:50:46 +08:00
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#endif /* CONFIG_PPC64 */
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2021-11-30 01:49:38 +08:00
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static inline ppc_inst_t ppc_inst_read(const u32 *ptr)
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2020-05-15 10:12:55 +08:00
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{
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if (IS_ENABLED(CONFIG_PPC64) && (*ptr >> 26) == OP_PREFIX)
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return ppc_inst_prefix(*ptr, *(ptr + 1));
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else
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return ppc_inst(*ptr);
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2020-05-15 10:12:55 +08:00
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}
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2021-11-30 01:49:38 +08:00
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static inline bool ppc_inst_prefixed(ppc_inst_t x)
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2020-05-15 10:12:55 +08:00
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{
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return IS_ENABLED(CONFIG_PPC64) && ppc_inst_primary_opcode(x) == OP_PREFIX;
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2020-05-06 11:40:28 +08:00
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}
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2021-11-30 01:49:38 +08:00
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static inline ppc_inst_t ppc_inst_swab(ppc_inst_t x)
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2020-05-06 11:40:29 +08:00
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{
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2021-05-20 21:50:46 +08:00
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return ppc_inst_prefix(swab32(ppc_inst_val(x)), swab32(ppc_inst_suffix(x)));
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2020-05-06 11:40:32 +08:00
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}
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2021-11-30 01:49:38 +08:00
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static inline bool ppc_inst_equal(ppc_inst_t x, ppc_inst_t y)
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2020-05-06 11:40:30 +08:00
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{
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2021-05-20 21:50:41 +08:00
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if (ppc_inst_val(x) != ppc_inst_val(y))
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return false;
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if (!ppc_inst_prefixed(x))
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return true;
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return ppc_inst_suffix(x) == ppc_inst_suffix(y);
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2020-05-06 11:40:30 +08:00
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}
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2021-11-30 01:49:38 +08:00
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static inline int ppc_inst_len(ppc_inst_t x)
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2020-05-15 10:12:55 +08:00
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{
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return ppc_inst_prefixed(x) ? 8 : 4;
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}
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powerpc: Add ppc_inst_next()
In a few places we want to calculate the address of the next
instruction. Previously that was simple, we just added 4 bytes, or if
using a u32 * we incremented that pointer by 1.
But prefixed instructions make it more complicated, we need to advance
by either 4 or 8 bytes depending on the actual instruction. We also
can't do pointer arithmetic using struct ppc_inst, because it is
always 8 bytes in size on 64-bit, even though we might only need to
advance by 4 bytes.
So add a ppc_inst_next() helper which calculates the location of the
next instruction, if the given instruction was located at the given
address. Note the instruction doesn't need to actually be at the
address in memory.
Although it would seem natural for the value to be passed by value,
that makes it too easy to write a loop that will read off the end of a
page, eg:
for (; src < end; src = ppc_inst_next(src, *src),
dest = ppc_inst_next(dest, *dest))
As noticed by Christophe and Jordan, if end is the exact end of a
page, and the next page is not mapped, this will fault, because *dest
will read 8 bytes, 4 bytes into the next page.
So value is passed by reference, so the helper can be careful to use
ppc_inst_read() on it.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Jordan Niethe <jniethe5@gmail.com>
Link: https://lore.kernel.org/r/20200522133318.1681406-1-mpe@ellerman.id.au
2020-05-22 21:33:18 +08:00
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/*
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* Return the address of the next instruction, if the instruction @value was
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* located at @location.
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*/
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2021-05-20 21:50:45 +08:00
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static inline u32 *ppc_inst_next(u32 *location, u32 *value)
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powerpc: Add ppc_inst_next()
In a few places we want to calculate the address of the next
instruction. Previously that was simple, we just added 4 bytes, or if
using a u32 * we incremented that pointer by 1.
But prefixed instructions make it more complicated, we need to advance
by either 4 or 8 bytes depending on the actual instruction. We also
can't do pointer arithmetic using struct ppc_inst, because it is
always 8 bytes in size on 64-bit, even though we might only need to
advance by 4 bytes.
So add a ppc_inst_next() helper which calculates the location of the
next instruction, if the given instruction was located at the given
address. Note the instruction doesn't need to actually be at the
address in memory.
Although it would seem natural for the value to be passed by value,
that makes it too easy to write a loop that will read off the end of a
page, eg:
for (; src < end; src = ppc_inst_next(src, *src),
dest = ppc_inst_next(dest, *dest))
As noticed by Christophe and Jordan, if end is the exact end of a
page, and the next page is not mapped, this will fault, because *dest
will read 8 bytes, 4 bytes into the next page.
So value is passed by reference, so the helper can be careful to use
ppc_inst_read() on it.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Jordan Niethe <jniethe5@gmail.com>
Link: https://lore.kernel.org/r/20200522133318.1681406-1-mpe@ellerman.id.au
2020-05-22 21:33:18 +08:00
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{
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2021-11-30 01:49:38 +08:00
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ppc_inst_t tmp;
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powerpc: Add ppc_inst_next()
In a few places we want to calculate the address of the next
instruction. Previously that was simple, we just added 4 bytes, or if
using a u32 * we incremented that pointer by 1.
But prefixed instructions make it more complicated, we need to advance
by either 4 or 8 bytes depending on the actual instruction. We also
can't do pointer arithmetic using struct ppc_inst, because it is
always 8 bytes in size on 64-bit, even though we might only need to
advance by 4 bytes.
So add a ppc_inst_next() helper which calculates the location of the
next instruction, if the given instruction was located at the given
address. Note the instruction doesn't need to actually be at the
address in memory.
Although it would seem natural for the value to be passed by value,
that makes it too easy to write a loop that will read off the end of a
page, eg:
for (; src < end; src = ppc_inst_next(src, *src),
dest = ppc_inst_next(dest, *dest))
As noticed by Christophe and Jordan, if end is the exact end of a
page, and the next page is not mapped, this will fault, because *dest
will read 8 bytes, 4 bytes into the next page.
So value is passed by reference, so the helper can be careful to use
ppc_inst_read() on it.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Jordan Niethe <jniethe5@gmail.com>
Link: https://lore.kernel.org/r/20200522133318.1681406-1-mpe@ellerman.id.au
2020-05-22 21:33:18 +08:00
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tmp = ppc_inst_read(value);
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2021-05-20 21:50:45 +08:00
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return (void *)location + ppc_inst_len(tmp);
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powerpc: Add ppc_inst_next()
In a few places we want to calculate the address of the next
instruction. Previously that was simple, we just added 4 bytes, or if
using a u32 * we incremented that pointer by 1.
But prefixed instructions make it more complicated, we need to advance
by either 4 or 8 bytes depending on the actual instruction. We also
can't do pointer arithmetic using struct ppc_inst, because it is
always 8 bytes in size on 64-bit, even though we might only need to
advance by 4 bytes.
So add a ppc_inst_next() helper which calculates the location of the
next instruction, if the given instruction was located at the given
address. Note the instruction doesn't need to actually be at the
address in memory.
Although it would seem natural for the value to be passed by value,
that makes it too easy to write a loop that will read off the end of a
page, eg:
for (; src < end; src = ppc_inst_next(src, *src),
dest = ppc_inst_next(dest, *dest))
As noticed by Christophe and Jordan, if end is the exact end of a
page, and the next page is not mapped, this will fault, because *dest
will read 8 bytes, 4 bytes into the next page.
So value is passed by reference, so the helper can be careful to use
ppc_inst_read() on it.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Jordan Niethe <jniethe5@gmail.com>
Link: https://lore.kernel.org/r/20200522133318.1681406-1-mpe@ellerman.id.au
2020-05-22 21:33:18 +08:00
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}
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2021-11-30 01:49:38 +08:00
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static inline unsigned long ppc_inst_as_ulong(ppc_inst_t x)
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2020-05-26 15:26:30 +08:00
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{
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2021-04-20 22:02:06 +08:00
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if (IS_ENABLED(CONFIG_PPC32))
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return ppc_inst_val(x);
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else if (IS_ENABLED(CONFIG_CPU_LITTLE_ENDIAN))
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return (u64)ppc_inst_suffix(x) << 32 | ppc_inst_val(x);
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else
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return (u64)ppc_inst_val(x) << 32 | ppc_inst_suffix(x);
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2020-05-26 15:26:30 +08:00
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}
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2020-06-02 13:27:25 +08:00
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#define PPC_INST_STR_LEN sizeof("00000000 00000000")
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2021-11-30 01:49:38 +08:00
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static inline char *__ppc_inst_as_str(char str[PPC_INST_STR_LEN], ppc_inst_t x)
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2020-06-02 13:27:25 +08:00
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{
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if (ppc_inst_prefixed(x))
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sprintf(str, "%08x %08x", ppc_inst_val(x), ppc_inst_suffix(x));
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else
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sprintf(str, "%08x", ppc_inst_val(x));
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return str;
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}
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#define ppc_inst_as_str(x) \
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({ \
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char __str[PPC_INST_STR_LEN]; \
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__ppc_inst_as_str(__str, x); \
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__str; \
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})
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2021-11-30 01:49:38 +08:00
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int copy_inst_from_kernel_nofault(ppc_inst_t *inst, u32 *src);
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2020-05-06 11:40:34 +08:00
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2020-05-06 11:40:26 +08:00
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#endif /* _ASM_POWERPC_INST_H */
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