or1k: ABI Implementation

This code deals with the OpenRISC ABI.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 80 insertions, 0 deletions

diff --git a/sysdeps/or1k/sysdep.h b/sysdeps/or1k/sysdep.h
new file mode 100644
index 0000000..14e5dce
--- /dev/null
+++ b/sysdeps/or1k/sysdep.h
@@ -0,0 +1,80 @@
+/* Assembler macro definitions.  OpenRISC version.
+   Copyright (C) 2022 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <sysdeps/generic/sysdep.h>
+#include <features.h>
+
+#if defined __ASSEMBLER__ || defined REQUEST_ASSEMBLER_MACROS
+
+/* Make use of .size directive.  */
+#define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
+
+/* Define an entry point visible from C.  */
+#define ENTRY(name)                                                           \
+  .globl C_SYMBOL_NAME(name);                                                 \
+  .type C_SYMBOL_NAME(name),@function;                                        \
+  .align 4;                                                                   \
+  C_LABEL(name)                                                               \
+  cfi_startproc;                                                              \
+  CALL_MCOUNT
+
+#undef  END
+#define END(name)                                                             \
+  cfi_endproc;                                                                \
+  ASM_SIZE_DIRECTIVE(name)
+
+/* Since C identifiers are not normally prefixed with an underscore
+   on this system, the asm identifier `syscall_error' intrudes on the
+   C name space.  Make sure we use an innocuous name.  */
+#define syscall_error   __syscall_error
+
+/* If compiled for profiling, call `mcount' at the start of each function.  */
+#ifdef  PROF
+# ifdef __PIC__
+#  define CALL_MCOUNT						\
+	l.addi	r1, r1, -8;					\
+	l.sw	0(r1), r9;					\
+	l.sw	4(r1), r3;					\
+	l.ori	r3, r9, 0;					\
+	l.j	plt(_mcount);					\
+	 l.nop;							\
+	l.lwz	r9, 0(r1);					\
+	l.lwz	r3, 4(r1);					\
+	l.addi	r1, r1, 8;
+# else
+#  define CALL_MCOUNT						\
+	l.addi	r1, r1, -8;					\
+	l.sw	0(r1), r9;					\
+	l.sw	4(r1), r3;					\
+	l.ori	r3, r9, 0;					\
+	l.movhi r15, hi(_mcount);				\
+	l.ori	r15, r15, lo(_mcount);				\
+	l.jr	r15;						\
+	 l.nop;							\
+	l.lwz	r9, 0(r1);					\
+	l.lwz	r3, 4(r1);					\
+	l.addi	r1, r1, 8;
+# endif
+#else
+# define CALL_MCOUNT             /* Do nothing.  */
+#endif
+
+/* Local label name for asm code.  */
+#define L(name)         .L##name
+
+#endif /* __ASSEMBLER__ */