@@ -1643,6 +1643,15 @@ loongarch_classify_symbol (const_rtx x)
&& !loongarch_symbol_binds_local_p (x))
return SYMBOL_GOT_DISP;
+ if (SYMBOL_REF_P (x))
+ {
+ tree decl = SYMBOL_REF_DECL (x);
+ /* A movable symbol may be moved away from the +/- 2GiB range around
+ the PC, so we have to use GOT. */
+ if (decl && lookup_attribute ("movable", DECL_ATTRIBUTES (decl)))
+ return SYMBOL_GOT_DISP;
+ }
+
return SYMBOL_PCREL;
}
@@ -6068,6 +6077,54 @@ loongarch_starting_frame_offset (void)
return crtl->outgoing_args_size;
}
+static tree
+loongarch_handle_movable_attribute (tree *node, tree name, tree, int,
+ bool *no_add_attrs)
+{
+ tree decl = *node;
+ if (TREE_CODE (decl) == VAR_DECL)
+ {
+ if (DECL_CONTEXT (decl)
+ && TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL
+ && !TREE_STATIC (decl))
+ {
+ error_at (DECL_SOURCE_LOCATION (decl),
+ "%qE attribute cannot be specified for local "
+ "variables", name);
+ *no_add_attrs = true;
+ }
+ }
+ else
+ {
+ warning (OPT_Wattributes, "%qE attribute ignored", name);
+ *no_add_attrs = true;
+ }
+ return NULL_TREE;
+}
+
+static const struct attribute_spec loongarch_attribute_table[] =
+{
+ /* { name, min_len, max_len, decl_req, type_req, fn_type_req,
+ affects_type_identity, handler, exclude } */
+ { "movable", 0, 0, true, false, false, false,
+ loongarch_handle_movable_attribute, NULL },
+ /* The last attribute spec is set to be NULL. */
+ {}
+};
+
+bool
+loongarch_use_anchors_for_symbol_p (const_rtx symbol)
+{
+ tree decl = SYMBOL_REF_DECL (symbol);
+
+ /* A movable attribute indicates the linker may move the symbol away,
+ so the use of anchor may cause relocation overflow. */
+ if (decl && lookup_attribute ("movable", DECL_ATTRIBUTES (decl)))
+ return false;
+
+ return default_use_anchors_for_symbol_p (symbol);
+}
+
/* Initialize the GCC target structure. */
#undef TARGET_ASM_ALIGNED_HI_OP
#define TARGET_ASM_ALIGNED_HI_OP "\t.half\t"
@@ -6256,6 +6313,12 @@ loongarch_starting_frame_offset (void)
#undef TARGET_HAVE_SPECULATION_SAFE_VALUE
#define TARGET_HAVE_SPECULATION_SAFE_VALUE speculation_safe_value_not_needed
+#undef TARGET_ATTRIBUTE_TABLE
+#define TARGET_ATTRIBUTE_TABLE loongarch_attribute_table
+
+#undef TARGET_USE_ANCHORS_FOR_SYMBOL_P
+#define TARGET_USE_ANCHORS_FOR_SYMBOL_P loongarch_use_anchors_for_symbol_p
+
struct gcc_target targetm = TARGET_INITIALIZER;
#include "gt-loongarch.h"
@@ -7314,6 +7314,7 @@ attributes.
* Blackfin Variable Attributes::
* H8/300 Variable Attributes::
* IA-64 Variable Attributes::
+* LoongArch Variable Attributes::
* M32R/D Variable Attributes::
* MeP Variable Attributes::
* Microsoft Windows Variable Attributes::
@@ -8098,6 +8099,21 @@ defined by shared libraries.
@end table
+@node LoongArch Variable Attributes
+@subsection LoongArch Variable Attributes
+
+One attribute is currently defined for the LoongArch.
+
+@table @code
+@item movable
+@cindex @code{movable} variable attribute, LoongArch
+Use this attribute on the LoongArch to mark an object possible to be moved
+by the linker, so its address is unlimited by the local data section range
+specified by the code model even if the object is defined locally. This
+attribute is mostly useful if a @code{section} attribute and/or a linker
+script will move the object somewhere unexpected by the code model.
+@end table
+
@node M32R/D Variable Attributes
@subsection M32R/D Variable Attributes
new file mode 100644
@@ -0,0 +1,29 @@
+/* { dg-do compile } */
+/* { dg-options "-mexplicit-relocs -mcmodel=normal -O2" } */
+/* { dg-final { scan-assembler-not "%pc" } } */
+/* { dg-final { scan-assembler-times "%got_pc_hi20" 3 } } */
+
+/* movable attribute should mark x and y possibly outside of the local
+ data range defined by the code model, so GOT should be used instead of
+ PC-relative. */
+
+int x __attribute__((movable));
+int y __attribute__((movable));
+
+int
+test(void)
+{
+ return x + y;
+}
+
+/* The following will be used for kernel per-cpu storage implemention. */
+
+register char *per_cpu_base __asm__("r21");
+static int counter __attribute__((section(".data..percpu"), movable));
+
+void
+inc_counter(void)
+{
+ int *ptr = (int *)(per_cpu_base + (long)&counter);
+ (*ptr)++;
+}