riscv: preliminarily support for libdl

Support for targets compiled with -fno-pic and -mno-relax

1 files changed, 144 insertions, 0 deletions

diff --git a/cpukit/score/cpu/riscv/include/machine/elf_machdep.h b/cpukit/score/cpu/riscv/include/machine/elf_machdep.h
new file mode 100644
index 0000000000..84220b8271
--- /dev/null
+++ b/cpukit/score/cpu/riscv/include/machine/elf_machdep.h
@@ -0,0 +1,144 @@
+/* $NetBSD: elf_machdep.h,v 1.6 2017/11/06 03:47:48 christos Exp $ */
+
+/*-
+ * Copyright (c) 2019 Hesham Almatary
+ *
+ * Copyright (c) 2014 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RISCV_ELF_MACHDEP_H_
+#define _RISCV_ELF_MACHDEP_H_
+
+#define EM_RISCV                243
+#define	ELF32_MACHDEP_ID		EM_RISCV
+#define	ELF64_MACHDEP_ID		EM_RISCV
+
+#define ELF32_MACHDEP_ENDIANNESS	ELFDATA2LSB
+#define ELF64_MACHDEP_ENDIANNESS	ELFDATA2LSB
+
+#define ELF32_MACHDEP_ID_CASES		\
+		case EM_RISCV:		\
+			break;
+
+#define	ELF64_MACHDEP_ID_CASES		\
+		case EM_RISCV:		\
+			break;
+
+#define	KERN_ELFSIZE		32
+#ifdef _LP64
+#define ARCH_ELFSIZE		64	/* MD native binary size */
+#else
+#define ARCH_ELFSIZE		32	/* MD native binary size */
+#endif
+
+/* Processor specific flags for the ELF header e_flags field.  */
+
+/* Processor specific relocation types */
+
+#define R_RISCV_NONE		0
+#define R_RISCV_32		1	// A
+#define R_RISCV_64		2
+#define R_RISCV_RELATIVE	3
+#define R_RISCV_COPY		4
+#define R_RISCV_JMP_SLOT	5
+#define R_RISCV_TLS_DTPMOD32	6
+#define R_RISCV_TLS_DTPREL32	7
+#define R_RISCV_TLS_DTPMOD64	8
+#define R_RISCV_TLS_DTPREL64	9
+#define R_RISCV_TLS_TPREL32	10
+#define R_RISCV_TLS_TPREL64	11
+
+/* The rest are not used by the dynamic linker */
+#define R_RISCV_BRANCH		16	// (A - P) & 0xffff
+#define R_RISCV_JAL		17	// A & 0xff
+#define R_RISCV_CALL		18	// (A - P) & 0xff
+#define R_RISCV_CALL_PLT	19
+#define R_RISCV_GOT_HI20	20
+#define R_RISCV_TLS_GOT_HI20	21
+#define R_RISCV_TLS_GD_HI20	22
+#define R_RISCV_PCREL_HI20	23
+#define R_RISCV_PCREL_LO12_I	24
+#define R_RISCV_PCREL_LO12_S	25
+#define R_RISCV_HI20		26	// A & 0xffff
+#define R_RISCV_LO12_I		27	// (A >> 16) & 0xffff
+#define R_RISCV_LO12_S		28	// (S + A - P) >> 2
+#define R_RISCV_TPREL_HI20	29
+#define R_RISCV_TPREL_LO12_I	30
+#define R_RISCV_TPREL_LO12_S	31
+#define R_RISCV_TPREL_ADD	32
+#define R_RISCV_ADD8		33
+#define R_RISCV_ADD16		34
+#define R_RISCV_ADD32		35
+#define R_RISCV_ADD64		36
+#define R_RISCV_SUB8		37
+#define R_RISCV_SUB16		38
+#define R_RISCV_SUB32		39
+#define R_RISCV_SUB64		40
+#define R_RISCV_GNU_VTINHERIT	41	// A & 0xffff
+#define R_RISCV_GNU_VTENTRY	42
+#define R_RISCV_ALIGN		43
+#define R_RISCV_RVC_BRANCH	44
+#define R_RISCV_RVC_JUMP	45
+#define R_RISCV_RVC_LUI   46
+
+#define R_RISCV_RELAX       51
+#define R_RISCV_SUB6        52
+#define R_RISCV_SET6        53
+#define R_RISCV_SET8        54
+#define R_RISCV_SET16       55
+#define R_RISCV_SET32       56
+
+#define R_RISCV_32_PCREL    57
+
+/* These are aliases we can use R_TYPESZ */
+#define R_RISCV_ADDR32		R_RISCV_32
+#define R_RISCV_ADDR64		R_RISCV_64
+
+#define R_TYPE(name)		R_RISCV_ ## name
+#if ELFSIZE == 32
+#define R_TYPESZ(name)		R_RISCV_ ## name ## 32
+#else
+#define R_TYPESZ(name)		R_RISCV_ ## name ## 64
+#endif
+
+#ifdef _KERNEL
+#ifdef ELFSIZE
+#define ELF_MD_PROBE_FUNC       ELFNAME2(cpu_netbsd,probe)
+#endif
+
+struct exec_package;
+
+int cpu_netbsd_elf32_probe(struct lwp *, struct exec_package *, void *, char *,
+        vaddr_t *);
+
+int cpu_netbsd_elf64_probe(struct lwp *, struct exec_package *, void *, char *,
+        vaddr_t *);
+
+#endif /* _KERNEL */
+
+#endif /* _RISCV_ELF_MACHDEP_H_ */