Add support for constructors and destuctors on GCN

2019-05-22  Kwok Cheung Yeung  <kcy@codesourcery.com>
            Andrew Stubbs  <amd@codesourcery.com>

	gcc/
	* config.gcc (gcc_cv_initfini_array): Set for AMD GCN.
	* config/gcn/gcn-run.c (init_array_kernel, fini_array_kernel): New.
	(kernel): Rename to...
	(main_kernel): ... this.
	(load_image): Load _init_array and _fini_array kernels.
	(run): Add argument for kernel to run.
	(main): Run init_array_kernel before main_kernel, and
	fini_array_kernel after.
	* config/gcn/gcn.c (gcn_handle_amdgpu_hsa_kernel_attribute): Allow
	amdgpu_hsa_kernel attribute on functions.
	(gcn_disable_constructors): Delete.
	(TARGET_ASM_CONSTRUCTOR, TARGET_ASM_DESTRUCTOR): Delete.
	* config/gcn/crt0.c (size_t): Define.
	(_init_array, _fini_array): New.
	(__preinit_array_start, __preinit_array_end,
	__init_array_start, __init_array_end,
	__fini_array_start, __fini_array_end): Declare weak references.

Co-Authored-By: Andrew Stubbs <ams@codesourcery.com>

From-SVN: r271526

1 files changed, 56 insertions, 0 deletions

diff --git a/libgcc/config/gcn/crt0.c b/libgcc/config/gcn/crt0.c
index c0b9353..9b58029 100644
--- a/libgcc/config/gcn/crt0.c
+++ b/libgcc/config/gcn/crt0.c
@@ -19,5 +19,61 @@
    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    <http://www.gnu.org/licenses/>.  */
 
+typedef long long size_t;
+
 /* Provide an entry point symbol to silence a linker warning.  */
 void _start() {}
+
+#ifdef USE_NEWLIB_INITFINI
+
+extern void __libc_init_array (void) __attribute__((weak));
+extern void __libc_fini_array (void) __attribute__((weak));
+
+__attribute__((amdgpu_hsa_kernel ()))
+void _init_array()
+{
+  __libc_init_array ();
+}
+
+__attribute__((amdgpu_hsa_kernel ()))
+void _fini_array()
+{
+  __libc_fini_array ();
+}
+
+#endif
+
+/* These magic symbols are provided by the linker.  */
+extern void (*__preinit_array_start []) (void) __attribute__((weak));
+extern void (*__preinit_array_end []) (void) __attribute__((weak));
+extern void (*__init_array_start []) (void) __attribute__((weak));
+extern void (*__init_array_end []) (void) __attribute__((weak));
+extern void (*__fini_array_start []) (void) __attribute__((weak));
+extern void (*__fini_array_end []) (void) __attribute__((weak));
+
+__attribute__((amdgpu_hsa_kernel ()))
+void _init_array()
+{
+  /* Iterate over all the init routines.  */
+  size_t count;
+  size_t i;
+
+  count = __preinit_array_end - __preinit_array_start;
+  for (i = 0; i < count; i++)
+    __preinit_array_start[i] ();
+
+  count = __init_array_end - __init_array_start;
+  for (i = 0; i < count; i++)
+    __init_array_start[i] ();
+}
+
+__attribute__((amdgpu_hsa_kernel ()))
+void _fini_array()
+{
+  size_t count;
+  size_t i;
+
+  count = __fini_array_end - __fini_array_start;
+  for (i = count; i > 0; i--)
+    __fini_array_start[i-1] ();
+}