linux-user/include/host/s390x/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 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