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