Add support for LoongArch

This implements initial support for the LoongArch architecture.

Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>

5 files changed, 217 insertions, 2 deletions

diff --git a/backends/ChangeLog b/backends/ChangeLog
index 5b0daffe..5813ddcc 100644
--- a/backends/ChangeLog
+++ b/backends/ChangeLog
@@ -1,3 +1,10 @@
+2022-12-02  Hengqi Chen  <hengqi.chen@gmail.com>
+
+	* Makefile.am (modules): Add loongarch.
+	* loongarch_init.c: New file.
+	* loongarch_reloc.def: New file.
+	* loongarch_symbol.c: New file.
+
 2022-08-09  Andreas Schwab  <schwab@suse.de>
 
 	* riscv_init.c (riscv_init): HOOK segment_type_name,
diff --git a/backends/Makefile.am b/backends/Makefile.am
index 9566377f..0824123d 100644
--- a/backends/Makefile.am
+++ b/backends/Makefile.am
@@ -37,7 +37,7 @@ AM_CPPFLAGS += -I$(top_srcdir)/libebl -I$(top_srcdir)/libasm \
 noinst_LIBRARIES = libebl_backends.a libebl_backends_pic.a
 
 modules = i386 sh x86_64 ia64 alpha arm aarch64 sparc ppc ppc64 s390 \
-	  m68k bpf riscv csky
+	  m68k bpf riscv csky loongarch
 
 i386_SRCS = i386_init.c i386_symbol.c i386_corenote.c i386_cfi.c \
 	    i386_retval.c i386_regs.c i386_auxv.c \
@@ -96,11 +96,14 @@ riscv_SRCS = riscv_init.c riscv_symbol.c riscv_cfi.c riscv_regs.c \
 csky_SRCS = csky_attrs.c csky_init.c csky_symbol.c csky_cfi.c \
 	    csky_regs.c csky_initreg.c csky_corenote.c
 
+loongarch_SRCS = loongarch_init.c loongarch_symbol.c
+
 libebl_backends_a_SOURCES = $(i386_SRCS) $(sh_SRCS) $(x86_64_SRCS) \
 			    $(ia64_SRCS) $(alpha_SRCS) $(arm_SRCS) \
 			    $(aarch64_SRCS) $(sparc_SRCS) $(ppc_SRCS) \
 			    $(ppc64_SRCS) $(s390_SRCS) \
-			    $(m68k_SRCS) $(bpf_SRCS) $(riscv_SRCS) $(csky_SRCS)
+			    $(m68k_SRCS) $(bpf_SRCS) $(riscv_SRCS) $(csky_SRCS) \
+			    $(loongarch_SRCS)
 
 libebl_backends_pic_a_SOURCES =
 am_libebl_backends_pic_a_OBJECTS = $(libebl_backends_a_SOURCES:.c=.os)
diff --git a/backends/loongarch_init.c b/backends/loongarch_init.c
new file mode 100644
index 00000000..a8ed9e81
--- /dev/null
+++ b/backends/loongarch_init.c
@@ -0,0 +1,50 @@
+/* Initialization of LoongArch specific backend library.
+   Copyright (C) 2022 Hengqi Chen
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils 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
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#define BACKEND		loongarch_
+#define RELOC_PREFIX	R_LARCH_
+#include "libebl_CPU.h"
+
+/* This defines the common reloc hooks based on loongarch_reloc.def.  */
+#include "common-reloc.c"
+
+
+Ebl *
+loongarch_init (Elf *elf __attribute__ ((unused)),
+	        GElf_Half machine __attribute__ ((unused)),
+	        Ebl *eh)
+{
+  loongarch_init_reloc (eh);
+  HOOK (eh, reloc_simple_type);
+
+  return eh;
+}
diff --git a/backends/loongarch_reloc.def b/backends/loongarch_reloc.def
new file mode 100644
index 00000000..dd4a6b6d
--- /dev/null
+++ b/backends/loongarch_reloc.def
@@ -0,0 +1,81 @@
+/* List the relocation types for LoongArch.  -*- C -*-
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils 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
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+/*	    NAME,			REL|EXEC|DYN	*/
+
+RELOC_TYPE (NONE,			EXEC|DYN)
+RELOC_TYPE (32,				REL|EXEC|DYN)
+RELOC_TYPE (64,				REL|EXEC|DYN)
+RELOC_TYPE (RELATIVE,			EXEC|DYN)
+RELOC_TYPE (COPY,			EXEC|DYN)
+RELOC_TYPE (JUMP_SLOT,			EXEC|DYN)
+RELOC_TYPE (TLS_DTPMOD32,		EXEC|DYN)
+RELOC_TYPE (TLS_DTPMOD64,		EXEC|DYN)
+RELOC_TYPE (TLS_DTPREL32,		EXEC|DYN)
+RELOC_TYPE (TLS_DTPREL64,		EXEC|DYN)
+RELOC_TYPE (TLS_TPREL32,		EXEC|DYN)
+RELOC_TYPE (TLS_TPREL64,		EXEC|DYN)
+RELOC_TYPE (IRELATIVE,			EXEC|DYN)
+RELOC_TYPE (MARK_LA,			REL)
+RELOC_TYPE (MARK_PCREL,			REL)
+RELOC_TYPE (SOP_PUSH_PCREL,		REL)
+RELOC_TYPE (SOP_PUSH_ABSOLUTE,		REL)
+RELOC_TYPE (SOP_PUSH_DUP,		REL)
+RELOC_TYPE (SOP_PUSH_GPREL,		REL)
+RELOC_TYPE (SOP_PUSH_TLS_TPREL,		REL)
+RELOC_TYPE (SOP_PUSH_TLS_GOT,		REL)
+RELOC_TYPE (SOP_PUSH_TLS_GD,		REL)
+RELOC_TYPE (SOP_PUSH_PLT_PCREL,		REL)
+RELOC_TYPE (SOP_ASSERT,			REL)
+RELOC_TYPE (SOP_NOT,			REL)
+RELOC_TYPE (SOP_SUB,			REL)
+RELOC_TYPE (SOP_SL,			REL)
+RELOC_TYPE (SOP_SR,			REL)
+RELOC_TYPE (SOP_ADD,			REL)
+RELOC_TYPE (SOP_AND,			REL)
+RELOC_TYPE (SOP_IF_ELSE,		REL)
+RELOC_TYPE (SOP_POP_32_S_10_5,		REL)
+RELOC_TYPE (SOP_POP_32_U_10_12,		REL)
+RELOC_TYPE (SOP_POP_32_S_10_12,		REL)
+RELOC_TYPE (SOP_POP_32_S_10_16,		REL)
+RELOC_TYPE (SOP_POP_32_S_10_16_S2,	REL)
+RELOC_TYPE (SOP_POP_32_S_5_20,		REL)
+RELOC_TYPE (SOP_POP_32_S_0_5_10_16_S2,	REL)
+RELOC_TYPE (SOP_POP_32_S_0_10_10_16_S2,	REL)
+RELOC_TYPE (SOP_POP_32_U,		REL)
+RELOC_TYPE (ADD8,			REL)
+RELOC_TYPE (ADD16,			REL)
+RELOC_TYPE (ADD24,			REL)
+RELOC_TYPE (ADD32,			REL)
+RELOC_TYPE (ADD64,			REL)
+RELOC_TYPE (SUB8,			REL)
+RELOC_TYPE (SUB16,			REL)
+RELOC_TYPE (SUB24,			REL)
+RELOC_TYPE (SUB32,			REL)
+RELOC_TYPE (SUB64,			REL)
+RELOC_TYPE (GNU_VTINHERIT,		REL)
+RELOC_TYPE (GNU_VTENTRY,		REL)
diff --git a/backends/loongarch_symbol.c b/backends/loongarch_symbol.c
new file mode 100644
index 00000000..8ba66a09
--- /dev/null
+++ b/backends/loongarch_symbol.c
@@ -0,0 +1,74 @@
+/* LoongArch specific symbolic name handling.
+   Copyright (C) 2022 Hengqi Chen
+   This file is part of elfutils.
+
+   This file is free software; you can redistribute it and/or modify
+   it under the terms of either
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at
+       your option) any later version
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at
+       your option) any later version
+
+   or both in parallel, as here.
+
+   elfutils 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
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <elf.h>
+#include <stddef.h>
+#include <string.h>
+
+#define BACKEND loongarch_
+#include "libebl_CPU.h"
+
+
+/* Check for the simple reloc types.  */
+Elf_Type
+loongarch_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type,
+			     int *addsub)
+{
+  switch (type)
+    {
+    case R_LARCH_32:
+      return ELF_T_WORD;
+    case R_LARCH_64:
+      return ELF_T_XWORD;
+    case R_LARCH_ADD16:
+      *addsub = 1;
+      return ELF_T_HALF;
+    case R_LARCH_ADD32:
+      *addsub = 1;
+      return ELF_T_WORD;
+    case R_LARCH_ADD64:
+      *addsub = 1;
+      return ELF_T_XWORD;
+    case R_LARCH_SUB16:
+      *addsub = -1;
+      return ELF_T_HALF;
+    case R_LARCH_SUB32:
+      *addsub = -1;
+      return ELF_T_WORD;
+    case R_LARCH_SUB64:
+      *addsub = -1;
+      return ELF_T_XWORD;
+    default:
+      return ELF_T_NUM;
+    }
+}