1 /*
2 * host-signal.h: signal info dependent on the host architecture
3 *
4 * Copyright (c) 2003-2005 Fabrice Bellard
5 * Copyright (c) 2021 WANG Xuerui <git@xen0n.name>
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 LOONGARCH64_HOST_SIGNAL_H
12 #define LOONGARCH64_HOST_SIGNAL_H
13
14 /* The third argument to a SA_SIGINFO handler is ucontext_t. */
15 typedef ucontext_t host_sigcontext;
16
host_signal_pc(host_sigcontext * uc)17 static inline uintptr_t host_signal_pc(host_sigcontext *uc)
18 {
19 return uc->uc_mcontext.__pc;
20 }
21
host_signal_set_pc(host_sigcontext * uc,uintptr_t pc)22 static inline void host_signal_set_pc(host_sigcontext *uc, uintptr_t pc)
23 {
24 uc->uc_mcontext.__pc = pc;
25 }
26
host_signal_mask(host_sigcontext * uc)27 static inline void *host_signal_mask(host_sigcontext *uc)
28 {
29 return &uc->uc_sigmask;
30 }
31
host_signal_write(siginfo_t * info,host_sigcontext * uc)32 static inline bool host_signal_write(siginfo_t *info, host_sigcontext *uc)
33 {
34 const uint32_t *pinsn = (const uint32_t *)host_signal_pc(uc);
35 uint32_t insn = pinsn[0];
36
37 /* Detect store by reading the instruction at the program counter. */
38 switch ((insn >> 26) & 0b111111) {
39 case 0b001000: /* {ll,sc}.[wd] */
40 switch ((insn >> 24) & 0b11) {
41 case 0b01: /* sc.w */
42 case 0b11: /* sc.d */
43 return true;
44 }
45 break;
46 case 0b001001: /* {ld,st}ox4.[wd] ({ld,st}ptr.[wd]) */
47 switch ((insn >> 24) & 0b11) {
48 case 0b01: /* stox4.w (stptr.w) */
49 case 0b11: /* stox4.d (stptr.d) */
50 return true;
51 }
52 break;
53 case 0b001010: /* {ld,st}.* family */
54 switch ((insn >> 22) & 0b1111) {
55 case 0b0100: /* st.b */
56 case 0b0101: /* st.h */
57 case 0b0110: /* st.w */
58 case 0b0111: /* st.d */
59 case 0b1101: /* fst.s */
60 case 0b1111: /* fst.d */
61 return true;
62 }
63 break;
64 case 0b001110: /* indexed, atomic, bounds-checking memory operations */
65 switch ((insn >> 15) & 0b11111111111) {
66 case 0b00000100000: /* stx.b */
67 case 0b00000101000: /* stx.h */
68 case 0b00000110000: /* stx.w */
69 case 0b00000111000: /* stx.d */
70 case 0b00001110000: /* fstx.s */
71 case 0b00001111000: /* fstx.d */
72 case 0b00011101100: /* fstgt.s */
73 case 0b00011101101: /* fstgt.d */
74 case 0b00011101110: /* fstle.s */
75 case 0b00011101111: /* fstle.d */
76 case 0b00011111000: /* stgt.b */
77 case 0b00011111001: /* stgt.h */
78 case 0b00011111010: /* stgt.w */
79 case 0b00011111011: /* stgt.d */
80 case 0b00011111100: /* stle.b */
81 case 0b00011111101: /* stle.h */
82 case 0b00011111110: /* stle.w */
83 case 0b00011111111: /* stle.d */
84 case 0b00011000000 ... 0b00011100011: /* am* insns */
85 return true;
86 }
87 break;
88 }
89
90 return false;
91 }
92
93 #endif
94