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1 /*
2 * host-signal.h: signal info dependent on the host architecture
3 *
4 * Copyright (c) 2003-2005 Fabrice Bellard
5 * Copyright (c) 2021 Linaro Limited
6 *
7 * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
8 * See the COPYING file in the top-level directory.
9 */
10
11 #ifndef S390_HOST_SIGNAL_H
12 #define S390_HOST_SIGNAL_H
13
14 /* The third argument to a SA_SIGINFO handler is ucontext_t. */
15 typedef ucontext_t host_sigcontext;
16
17 static inline uintptr_t host_signal_pc(host_sigcontext *uc)
18 {
19 return uc->uc_mcontext.psw.addr;
20 }
21
22 static inline void host_signal_set_pc(host_sigcontext *uc, uintptr_t pc)
23 {
24 uc->uc_mcontext.psw.addr = pc;
25 }
26
27 static inline void *host_signal_mask(host_sigcontext *uc)
28 {
29 return &uc->uc_sigmask;
30 }
31
32 static inline bool host_signal_write(siginfo_t *info, host_sigcontext *uc)
33 {
34 uint16_t *pinsn = (uint16_t *)host_signal_pc(uc);
35
36 /*
37 * ??? On linux, the non-rt signal handler has 4 (!) arguments instead
38 * of the normal 2 arguments. The 4th argument contains the "Translation-
39 * Exception Identification for DAT Exceptions" from the hardware (aka
40 * "int_parm_long"), which does in fact contain the is_write value.
41 * The rt signal handler, as far as I can tell, does not give this value
42 * at all. Not that we could get to it from here even if it were.
43 * So fall back to parsing instructions. Treat read-modify-write ones as
44 * writes, which is not fully correct, but for tracking self-modifying code
45 * this is better than treating them as reads. Checking si_addr page flags
46 * might be a viable improvement, albeit a racy one.
47 */
48 /* ??? This is not even close to complete. */
49 switch (pinsn[0] >> 8) {
50 case 0x50: /* ST */
51 case 0x42: /* STC */
52 case 0x40: /* STH */
53 case 0x44: /* EX */
54 case 0xba: /* CS */
55 case 0xbb: /* CDS */
56 return true;
57 case 0xc4: /* RIL format insns */
58 switch (pinsn[0] & 0xf) {
59 case 0xf: /* STRL */
60 case 0xb: /* STGRL */
61 case 0x7: /* STHRL */
62 return true;
63 }
64 break;
65 case 0xc6: /* RIL-b format insns */
66 switch (pinsn[0] & 0xf) {
67 case 0x0: /* EXRL */
68 return true;
69 }
70 break;
71 case 0xc8: /* SSF format insns */
72 switch (pinsn[0] & 0xf) {
73 case 0x2: /* CSST */
74 return true;
75 }
76 break;
77 case 0xe3: /* RXY format insns */
78 switch (pinsn[2] & 0xff) {
79 case 0x50: /* STY */
80 case 0x24: /* STG */
81 case 0x72: /* STCY */
82 case 0x70: /* STHY */
83 case 0x8e: /* STPQ */
84 case 0x3f: /* STRVH */
85 case 0x3e: /* STRV */
86 case 0x2f: /* STRVG */
87 return true;
88 }
89 break;
90 case 0xe6:
91 switch (pinsn[2] & 0xff) {
92 case 0x09: /* VSTEBRH */
93 case 0x0a: /* VSTEBRG */
94 case 0x0b: /* VSTEBRF */
95 case 0x0e: /* VSTBR */
96 case 0x0f: /* VSTER */
97 case 0x3f: /* VSTRLR */
98 return true;
99 }
100 break;
101 case 0xe7:
102 switch (pinsn[2] & 0xff) {
103 case 0x08: /* VSTEB */
104 case 0x09: /* VSTEH */
105 case 0x0a: /* VSTEG */
106 case 0x0b: /* VSTEF */
107 case 0x0e: /* VST */
108 case 0x1a: /* VSCEG */
109 case 0x1b: /* VSCEF */
110 case 0x3e: /* VSTM */
111 case 0x3f: /* VSTL */
112 return true;
113 }
114 break;
115 case 0xeb: /* RSY format insns */
116 switch (pinsn[2] & 0xff) {
117 case 0x14: /* CSY */
118 case 0x30: /* CSG */
119 case 0x31: /* CDSY */
120 case 0x3e: /* CDSG */
121 case 0xe4: /* LANG */
122 case 0xe6: /* LAOG */
123 case 0xe7: /* LAXG */
124 case 0xe8: /* LAAG */
125 case 0xea: /* LAALG */
126 case 0xf4: /* LAN */
127 case 0xf6: /* LAO */
128 case 0xf7: /* LAX */
129 case 0xfa: /* LAAL */
130 case 0xf8: /* LAA */
131 return true;
132 }
133 break;
134 }
135 return false;
136 }
137
138 #endif