linux-user/host/loongarch64/host-signal.h

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