Patch for supporting internal musl-libc signals in Alpine GDB

gdb/common/signals.c

@@ -23,6 +23,21 @@
 #include <signal.h>
 #endif
 
+/* Hack for supporting internal musl-libc signals, defined in:
+   http://git.musl-libc.org/cgit/musl/tree/src/internal/pthread_impl.h */
+
+#ifndef SIGTIMER
+#define SIGTIMER 32
+#endif
+
+#ifndef SIGCANCEL
+#define SIGCANCEL 33
+#endif
+
+#ifndef SIGSYNCCALL
+#define SIGSYNCCALL 34
+#endif
+
 #include "gdb_signals.h"
 
 struct gdbarch;
@@ -104,6 +119,7 @@ gdb_signal_from_name (const char *name)
     if (signals[sig].name != NULL
 	&& strcmp (name, signals[sig].name) == 0)
       return sig;
+
   return GDB_SIGNAL_UNKNOWN;
 }
 
@@ -336,6 +352,15 @@ gdb_signal_from_host (int hostsig)
     return GDB_SIGNAL_LIBRT;
 #endif
 
+#if defined (SIGTIMER)
+  if (hostsig == SIGTIMER)
+    return GDB_SIGNAL_TIMER;
+#endif
+#if defined (SIGSYNCCALL)
+  if (hostsig == SIGSYNCCALL)
+    return GDB_SIGNAL_SYNCCALL;
+#endif
+
 #if defined (REALTIME_LO)
   if (hostsig >= REALTIME_LO && hostsig < REALTIME_HI)
     {
@@ -593,6 +618,15 @@ do_gdb_signal_to_host (enum gdb_signal oursig,
       return SIGLIBRT;
 #endif
 
+#if defined (SIGTIMER)
+    case GDB_SIGNAL_TIMER:
+      return SIGTIMER;
+#endif
+#if defined (SIGSYNCCALL)
+    case GDB_SIGNAL_SYNCCALL:
+      return SIGSYNCCALL;
+#endif
+
     default:
 #if defined (REALTIME_LO)
       retsig = 0;

include/gdb/signals.def

@@ -196,7 +196,10 @@ SET (GDB_EXC_BREAKPOINT, 150, "EXC_BREAKPOINT", "Breakpoint")
 
 SET (GDB_SIGNAL_LIBRT, 151, "SIGLIBRT", "librt internal signal")
 
+SET (GDB_SIGNAL_TIMER, 152, "SIGTIMER", "SIGTIMER")
+SET (GDB_SIGNAL_SYNCCALL, 153, "SIGSYNCCALL", "SIGSYNCCALL")
+
 /* If you are adding a new signal, add it just above this comment.  */
 
 /* Last and unused enum value, for sizing arrays, etc.  */
-SET (GDB_SIGNAL_LAST, 152, NULL, "GDB_SIGNAL_LAST")
+SET (GDB_SIGNAL_LAST, 154, NULL, "GDB_SIGNAL_LAST")