Enable build on old Linux (#11414)

This change enables building coreclr on old Linux distros that
don't have PR_SET_PTRACER and don't have _xstate struct in the
standard sigcontext.h header.

Author: janvorli

src/debug/createdump/threadinfo.cpp

@@ -38,7 +38,7 @@ ThreadInfo::Initialize(ICLRDataTarget* dataTarget)
             return false;
         }
     }
-    TRACE("Thread %04x RIP %016llx RSP %016llx\n", m_tid, m_gpRegisters.rip, m_gpRegisters.rsp);
+    TRACE("Thread %04x RIP %016llx RSP %016llx\n", m_tid, (unsigned long long)m_gpRegisters.rip, (unsigned long long)m_gpRegisters.rsp);
     return true;
 }
 

src/pal/src/CMakeLists.txt

@@ -93,10 +93,10 @@ elseif(PAL_CMAKE_PLATFORM_ARCH_I386)
   set(PAL_ARCH_SOURCES_DIR i386)
 endif()
 
-if(CMAKE_SYSTEM_NAME STREQUAL Linux AND NOT CLR_CMAKE_PLATFORM_ALPINE_LINUX)
+if(PAL_CMAKE_PLATFORM_ARCH_AMD64 AND CMAKE_SYSTEM_NAME STREQUAL Linux AND NOT CLR_CMAKE_PLATFORM_ALPINE_LINUX)
   # Currently the _xstate is not available on Alpine Linux
   add_definitions(-DXSTATE_SUPPORTED)
-endif(CMAKE_SYSTEM_NAME STREQUAL Linux AND NOT CLR_CMAKE_PLATFORM_ALPINE_LINUX)
+endif(PAL_CMAKE_PLATFORM_ARCH_AMD64 AND CMAKE_SYSTEM_NAME STREQUAL Linux AND NOT CLR_CMAKE_PLATFORM_ALPINE_LINUX)
 
 if(CLR_CMAKE_PLATFORM_ALPINE_LINUX)
   # Setting RLIMIT_NOFILE breaks debugging of coreclr on Alpine Linux for some reason

src/pal/src/config.h.in

@@ -66,6 +66,8 @@
 #cmakedefine HAVE_UNW_GET_ACCESSORS
 #cmakedefine01 HAVE_XSWDEV
 #cmakedefine01 HAVE_XSW_USAGE
+#cmakedefine01 HAVE_PUBLIC_XSTATE_STRUCT
+#cmakedefine01 HAVE_PR_SET_PTRACER
 
 #cmakedefine01 HAVE_STAT_TIMESPEC
 #cmakedefine01 HAVE_STAT_NSEC

src/pal/src/configure.cmake

@@ -1022,6 +1022,25 @@ int main(int argc, char **argv)
     return 0;
 }" HAVE_XSW_USAGE)
 
+check_cxx_source_compiles("
+#include <signal.h>
+
+int main(int argc, char **argv)
+{
+    struct _xstate xstate;
+    struct _fpx_sw_bytes bytes;
+    return 0;
+}" HAVE_PUBLIC_XSTATE_STRUCT)
+
+check_cxx_source_compiles("
+#include <sys/prctl.h>
+
+int main(int argc, char **argv)
+{
+    int flag = (int)PR_SET_PTRACER;
+    return 0;
+}" HAVE_PR_SET_PTRACER)
+
 set(CMAKE_REQUIRED_LIBRARIES pthread)
 check_cxx_source_compiles("
 #include <errno.h>

src/pal/src/include/pal/context.h

@@ -39,6 +39,16 @@ typedef ucontext_t native_context_t;
 #else   // HAVE_UCONTEXT_T
 #error Native context type is not known on this platform!
 #endif  // HAVE_UCONTEXT_T
+
+#if defined(XSTATE_SUPPORTED) && !HAVE_PUBLIC_XSTATE_STRUCT
+namespace asm_sigcontext
+{
+#include <asm/sigcontext.h>
+};
+using asm_sigcontext::_fpx_sw_bytes;
+using asm_sigcontext::_xstate;
+#endif // defined(XSTATE_SUPPORTED) && !HAVE_PUBLIC_XSTATE_STRUCT
+
 #else // !HAVE_MACH_EXCEPTIONS
 #include <mach/kern_return.h>
 #include <mach/mach_port.h>

src/pal/src/thread/process.cpp

@@ -2981,7 +2981,7 @@ PROCAbort()
     // Do any shutdown cleanup before aborting or creating a core dump
     PROCNotifyProcessShutdown();
 
-#if HAVE_PRCTL_H
+#if HAVE_PRCTL_H && HAVE_PR_SET_PTRACER
     // If enabled, launch the create minidump utility and wait until it completes
     if (g_argvCreateDump[0] != nullptr)
     {
@@ -3018,7 +3018,7 @@ PROCAbort()
             }
         }
     }
-#endif // HAVE_PRCTL_H
+#endif // HAVE_PRCTL_H && HAVE_PR_SET_PTRACER
     // Abort the process after waiting for the core dump to complete
     abort();
 }