From 02cefdaa6429e620d6457fdb3ad9934f194c5a93 Mon Sep 17 00:00:00 2001
From: Kurt Roeckx <kurt@roeckx.be>
Date: Tue, 22 Apr 2014 21:46:22 +0200
Subject: [PATCH] Unwinding is only supported on Linux

Index: elfutils-0.158/backends/i386_initreg.c
===================================================================
--- elfutils-0.158.orig/backends/i386_initreg.c	2014-05-01 17:11:18.870616302 +0000
+++ elfutils-0.158/backends/i386_initreg.c	2014-05-01 17:11:18.866616384 +0000
@@ -44,7 +44,7 @@
 			  ebl_tid_registers_t *setfunc __attribute__ ((unused)),
 				void *arg __attribute__ ((unused)))
 {
-#if !defined __i386__ && !defined __x86_64__
+#if (!defined __i386__ && !defined __x86_64__) || !defined(__linux__)
   return false;
 #else /* __i386__ || __x86_64__ */
   struct user_regs_struct user_regs;
Index: elfutils-0.158/backends/x86_64_initreg.c
===================================================================
--- elfutils-0.158.orig/backends/x86_64_initreg.c	2014-05-01 17:11:18.870616302 +0000
+++ elfutils-0.158/backends/x86_64_initreg.c	2014-05-01 17:11:18.866616384 +0000
@@ -44,7 +44,7 @@
 			  ebl_tid_registers_t *setfunc __attribute__ ((unused)),
 				  void *arg __attribute__ ((unused)))
 {
-#ifndef __x86_64__
+#if !defined(__x86_64__) || !defined(__linux__)
   return false;
 #else /* __x86_64__ */
   struct user_regs_struct user_regs;
Index: elfutils-0.158/libdwfl/linux-pid-attach.c
===================================================================
--- elfutils-0.158.orig/libdwfl/linux-pid-attach.c	2014-05-01 17:11:18.870616302 +0000
+++ elfutils-0.158/libdwfl/linux-pid-attach.c	2014-05-01 17:12:47.980766442 +0000
@@ -37,6 +37,8 @@
 # define MAX(a, b) ((a) > (b) ? (a) : (b))
 #endif
 
+#ifdef __linux__
+
 struct pid_arg
 {
   DIR *dir;
@@ -358,3 +360,87 @@
   return 0;
 }
 INTDEF (dwfl_linux_proc_attach)
+
+#else	/* __linux__ */
+
+static pid_t
+pid_next_thread (Dwfl *dwfl __attribute__ ((unused)),
+	         void *dwfl_arg __attribute__ ((unused)),
+		 void **thread_argp __attribute__ ((unused)))
+{
+  errno = ENOSYS;
+  __libdwfl_seterrno (DWFL_E_ERRNO);
+  return -1;
+}
+
+static bool
+pid_getthread (Dwfl *dwfl __attribute__ ((unused)),
+	       pid_t tid __attribute__ ((unused)),
+	       void *dwfl_arg __attribute__ ((unused)),
+	       void **thread_argp __attribute__ ((unused)))
+{
+  errno = ENOSYS;
+  __libdwfl_seterrno (DWFL_E_ERRNO);
+  return false;
+}
+
+static bool
+pid_memory_read (Dwfl *dwfl __attribute__ ((unused)),
+                 Dwarf_Addr addr __attribute__ ((unused)),
+	         Dwarf_Word *result __attribute__ ((unused)),
+	         void *arg __attribute__ ((unused)))
+{
+  errno = ENOSYS;
+  __libdwfl_seterrno (DWFL_E_ERRNO);
+  return false;
+}
+
+static bool
+pid_set_initial_registers (Dwfl_Thread *thread __attribute__ ((unused)),
+			   void *thread_arg __attribute__ ((unused)))
+{
+  errno = ENOSYS;
+  __libdwfl_seterrno (DWFL_E_ERRNO);
+  return false;
+}
+
+static void
+pid_detach (Dwfl *dwfl __attribute__ ((unused)),
+	    void *dwfl_arg __attribute__ ((unused)))
+{
+}
+
+static void
+pid_thread_detach (Dwfl_Thread *thread __attribute__ ((unused)),
+		  void *thread_arg __attribute__ ((unused)))
+{
+}
+
+static const Dwfl_Thread_Callbacks pid_thread_callbacks =
+{
+  pid_next_thread,
+  pid_getthread,
+  pid_memory_read,
+  pid_set_initial_registers,
+  pid_detach,
+  pid_thread_detach,
+};
+
+int
+dwfl_linux_proc_attach (Dwfl *dwfl __attribute__ ((unused)),
+			pid_t pid __attribute__ ((unused)),
+			bool assume_ptrace_stopped __attribute__ ((unused)))
+{
+  return ENOSYS;
+}
+INTDEF (dwfl_linux_proc_attach)
+
+struct __libdwfl_pid_arg *
+internal_function
+__libdwfl_get_pid_arg (Dwfl *dwfl __attribute__ ((unused)))
+{
+  return NULL;
+}
+
+#endif /* ! __linux __ */
+
Index: elfutils-0.158/tests/backtrace-child.c
===================================================================
--- elfutils-0.158.orig/tests/backtrace-child.c	2014-05-01 17:11:18.870616302 +0000
+++ elfutils-0.158/tests/backtrace-child.c	2014-05-01 17:11:18.866616384 +0000
@@ -79,6 +79,18 @@
 #include <stdio.h>
 #include <unistd.h>
 
+#ifndef __linux__
+
+int
+main (int argc __attribute__ ((unused)), char **argv)
+{
+  fprintf (stderr, "%s: Unwinding not supported for this architecture\n",
+           argv[0]);
+  return 77;
+}
+
+#else /* __linux__ */
+
 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
 #define NOINLINE_NOCLONE __attribute__ ((noinline, noclone))
 #else
@@ -221,3 +233,6 @@
   /* Not reached.  */
   abort ();
 }
+
+#endif /* ! __linux__ */
+
Index: elfutils-0.158/tests/backtrace-data.c
===================================================================
--- elfutils-0.158.orig/tests/backtrace-data.c	2014-05-01 17:11:18.870616302 +0000
+++ elfutils-0.158/tests/backtrace-data.c	2014-05-01 17:11:18.866616384 +0000
@@ -40,7 +40,7 @@
 #include <string.h>
 #include ELFUTILS_HEADER(dwfl)
 
-#ifndef __x86_64__
+#if !defined(__x86_64__) || !defined(__linux__)
 
 int
 main (int argc __attribute__ ((unused)), char **argv)
@@ -50,7 +50,7 @@
   return 77;
 }
 
-#else /* __x86_64__ */
+#else /* __x86_64__ && __linux__ */
 
 /* The only arch specific code is set_initial_registers.  */
 
Index: elfutils-0.158/tests/backtrace-dwarf.c
===================================================================
--- elfutils-0.158.orig/tests/backtrace-dwarf.c	2014-05-01 17:11:18.870616302 +0000
+++ elfutils-0.158/tests/backtrace-dwarf.c	2014-05-01 17:11:18.866616384 +0000
@@ -25,6 +25,18 @@
 #include <sys/ptrace.h>
 #include ELFUTILS_HEADER(dwfl)
 
+#ifndef __linux__
+
+int
+main (int argc __attribute__ ((unused)), char **argv)
+{
+  fprintf (stderr, "%s: Unwinding not supported for this architecture\n",
+           argv[0]);
+  return 77;
+}
+
+#else /* __linux__ */
+
 static void cleanup_13_abort (void);
 #define main cleanup_13_main
 #include "cleanup-13.c"
@@ -148,3 +160,6 @@
   /* There is an exit (0) call if we find the "main" frame,  */
   error (1, 0, "dwfl_getthreads: %s", dwfl_errmsg (-1));
 }
+
+#endif /* ! __linux__ */
+
Index: elfutils-0.158/tests/backtrace-subr.sh
===================================================================
--- elfutils-0.158.orig/tests/backtrace-subr.sh	2014-05-01 17:11:18.870616302 +0000
+++ elfutils-0.158/tests/backtrace-subr.sh	2014-05-01 17:11:18.866616384 +0000
@@ -84,6 +84,7 @@
   echo ./backtrace ./backtrace.$arch.{exec,core}
   testrun ${abs_builddir}/backtrace -e ./backtrace.$arch.exec --core=./backtrace.$arch.core 1>backtrace.$arch.bt 2>backtrace.$arch.err || true
   cat backtrace.$arch.{bt,err}
+  check_unsupported backtrace.$arch.err backtrace.$arch.core
   check_all backtrace.$arch.{bt,err} backtrace.$arch.core
 }
 
Index: elfutils-0.158/tests/backtrace.c
===================================================================
--- elfutils-0.158.orig/tests/backtrace.c	2014-05-01 17:11:18.870616302 +0000
+++ elfutils-0.158/tests/backtrace.c	2014-05-01 17:11:18.866616384 +0000
@@ -39,6 +39,18 @@
 #include <sys/syscall.h>
 #include ELFUTILS_HEADER(dwfl)
 
+#ifndef __linux__
+
+int
+main (int argc __attribute__ ((unused)), char **argv)
+{
+  fprintf (stderr, "%s: Unwinding not supported for this architecture\n",
+	   argv[0]);
+  return 77;
+}
+
+#else /* __linux__ */
+
 static int
 dump_modules (Dwfl_Module *mod, void **userdata __attribute__ ((unused)),
 	      const char *name, Dwarf_Addr start,
@@ -452,3 +464,6 @@
   dwfl_end (dwfl);
   return 0;
 }
+
+#endif /* ! __linux__ */
+