[rpcsx-os/orbis-kernel] random bugfixes

ipmi: fixed respond sync, get message, try get message, try send message
event: detach event emitter from file
signals: basic implementation
linker: fixed zero symbol relocation, fixed exec relocation
shared_cv/mutex: implement eintr response support
shared_cv: fixed possible loop instead of wait
ipmi: implement invoke async, respond async, get result, get client app id, client get name
rpcsx-os: add safemode flag

orbis-kernel/include/orbis/ucontext.hpp

@@ -54,7 +54,20 @@ struct Stack {
 };
 
 struct SigSet {
-  ulong bits[2];
+  static constexpr auto min = 1;
+  static constexpr auto max = 128;
+
+  uint bits[4];
+
+  bool test(unsigned signal) const {
+    return (bits[(signal - 1) >> 5] & (1 << ((signal - 1) & 31))) != 0;
+  }
+  void set(unsigned signal) {
+    bits[(signal - 1) >> 5] |= (1 << ((signal - 1) & 31));
+  }
+  void clear(unsigned signal) {
+    bits[(signal - 1) >> 5] &= ~(1 << ((signal - 1) & 31));
+  }
 };
 
 struct UContext {
@@ -67,4 +80,87 @@ struct UContext {
   sint spare[4];
   sint unk1[3];
 };
+
+static_assert(sizeof(UContext) == 0x500);
+
+
+enum Signal {
+  kSigHup = 1,
+  kSigInt = 2,
+  kSigQuit = 3,
+  kSigIll = 4,
+  kSigTrap = 5,
+  kSigAbrt = 6,
+  kSigEmt = 7,
+  kSigFpe = 8,
+  kSigKill = 9,
+  kSigBus = 10,
+  kSigSegv = 11,
+  kSigSys = 12,
+  kSigPipe = 13,
+  kSigAlrm = 14,
+  kSigUrg = 16,
+  kSigStop = 17,
+  kSigTstp = 18,
+  kSigCont = 19,
+  kSigChld = 20,
+  kSigTtin = 21,
+  kSigTtou = 22,
+  kSigIo = 23,
+  kSigXcpu = 24,
+  kSigXfsz = 25,
+  kSigVtalrm = 26,
+  kSigProf = 27,
+  kSigWinch = 28,
+  kSigInfo = 29,
+  kSigUsr1 = 30,
+  kSigUsr2 = 31,
+  kSigThr = 32,
+};
+
+struct SigAction {
+  ptr<void(int32_t, void *, void *)> handler;
+  sint flags;
+  SigSet mask;
+};
+
+union SigVal {
+  sint integer;
+  ptr<void> pointer;
+};
+
+struct SigInfo {
+  sint signo;
+  sint errno_;
+  sint code;
+  sint pid;
+  slong uid;
+  sint status;
+  ptr<void> addr;
+  SigVal value;
+
+  union {
+    struct {
+      sint trapno;
+    } fault;
+
+    struct {
+      sint timerid;
+      sint overrun;
+    } timer;
+
+    struct {
+      sint mqd;
+    } mesgq;
+
+    struct {
+      slong band;
+    } poll;
+
+    struct {
+      slong spare1;
+      sint spare2[7];
+    } spare;
+  } reason;
+};
 } // namespace orbis