1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PKEYS_POWERPC_H
#define _PKEYS_POWERPC_H
#ifndef SYS_mprotect_key
# define SYS_mprotect_key 386
#endif
#ifndef SYS_pkey_alloc
# define SYS_pkey_alloc 384
# define SYS_pkey_free 385
#endif
#define REG_IP_IDX PT_NIP
#define REG_TRAPNO PT_TRAP
#define gregs gp_regs
#define fpregs fp_regs
#define si_pkey_offset 0x20
#ifndef PKEY_DISABLE_ACCESS
# define PKEY_DISABLE_ACCESS 0x3 /* disable read and write */
#endif
#ifndef PKEY_DISABLE_WRITE
# define PKEY_DISABLE_WRITE 0x2
#endif
#define NR_PKEYS 32
#define NR_RESERVED_PKEYS_4K 27 /* pkey-0, pkey-1, exec-only-pkey
and 24 other keys that cannot be
represented in the PTE */
#define NR_RESERVED_PKEYS_64K 3 /* pkey-0, pkey-1 and exec-only-pkey */
#define PKEY_BITS_PER_PKEY 2
#define HPAGE_SIZE (1UL << 24)
#define PAGE_SIZE (1UL << 16)
static inline u32 pkey_bit_position(int pkey)
{
return (NR_PKEYS - pkey - 1) * PKEY_BITS_PER_PKEY;
}
static inline u64 __read_pkey_reg(void)
{
u64 pkey_reg;
asm volatile("mfspr %0, 0xd" : "=r" (pkey_reg));
return pkey_reg;
}
static inline void __write_pkey_reg(u64 pkey_reg)
{
u64 amr = pkey_reg;
dprintf4("%s() changing %016llx to %016llx\n",
__func__, __read_pkey_reg(), pkey_reg);
asm volatile("isync; mtspr 0xd, %0; isync"
: : "r" ((unsigned long)(amr)) : "memory");
dprintf4("%s() pkey register after changing %016llx to %016llx\n",
__func__, __read_pkey_reg(), pkey_reg);
}
static inline int cpu_has_pku(void)
{
return 1;
}
static inline int get_arch_reserved_keys(void)
{
if (sysconf(_SC_PAGESIZE) == 4096)
return NR_RESERVED_PKEYS_4K;
else
return NR_RESERVED_PKEYS_64K;
}
void expect_fault_on_read_execonly_key(void *p1, int pkey)
{
/*
* powerpc does not allow userspace to change permissions of exec-only
* keys since those keys are not allocated by userspace. The signal
* handler wont be able to reset the permissions, which means the code
* will infinitely continue to segfault here.
*/
return;
}
/* 4-byte instructions * 16384 = 64K page */
#define __page_o_noops() asm(".rept 16384 ; nop; .endr")
#endif /* _PKEYS_POWERPC_H */
|
