| 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 | |
| 17 | static inline uintptr_t host_signal_pc(host_sigcontext *uc) |
| 18 | { |
| 19 | return uc->uc_mcontext.__pc; |
| 20 | } |
| 21 | |
| 22 | static inline void host_signal_set_pc(host_sigcontext *uc, uintptr_t pc) |
| 23 | { |
| 24 | uc->uc_mcontext.__pc = 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 | 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 |