Add support for loongarch

configure.ac

@@ -42,6 +42,7 @@ AC_SUBST(HOST_OS)
 case "${host_cpu}" in
     arm*|sa110)		HOST_CPU="arm" ;;
     cris*)		HOST_CPU="cris" ;;
+    loongarch*)		HOST_CPU="loongarch" ;;
     mips*)		HOST_CPU="mips" ;;
     powerpc|powerpc64|powerpc64le)	HOST_CPU="ppc" ;;
     sun4u|sparc64)	HOST_CPU="sparc" ;;
@@ -217,6 +218,7 @@ if test x"$enable_libunwind" = xyes; then
       powerpc)		  UNWIND_ARCH="ppc32" ;;
       powerpc64|powerpc64le)	UNWIND_ARCH="ppc64" ;;
       mips*)		  UNWIND_ARCH="mips" ;;
+      loongarch*)	  UNWIND_ARCH="loongarch" ;;
       *)		  UNWIND_ARCH="${host_cpu}" ;;
   esac
 
@@ -407,6 +409,7 @@ AC_CONFIG_FILES([
 	sysdeps/linux-gnu/arm/Makefile
 	sysdeps/linux-gnu/cris/Makefile
 	sysdeps/linux-gnu/ia64/Makefile
+	sysdeps/linux-gnu/loongarch/Makefile
 	sysdeps/linux-gnu/m68k/Makefile
 	sysdeps/linux-gnu/metag/Makefile
 	sysdeps/linux-gnu/mips/Makefile

sysdeps/linux-gnu/loongarch/Makefile.am

@@ -0,0 +1,25 @@
+# This file is part of ltrace.
+# Copyright (C) 2024 Loongson Technology Corporation Limited.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of 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.
+#
+# This program 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 a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+noinst_LTLIBRARIES = ../libcpu.la
+
+___libcpu_la_SOURCES = fetch.c plt.c regs.c trace.c
+
+noinst_HEADERS = arch.h ptrace.h signalent.h syscallent.h
+
+MAINTAINERCLEANFILES = Makefile.in

sysdeps/linux-gnu/loongarch/arch.h

@@ -0,0 +1,48 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2024 Loongson Technology Corporation Limited.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of 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.
+ *
+ * This program 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 a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef LTRACE_LOONGARCH_ARCH_H
+#define LTRACE_LOONGARCH_ARCH_H
+
+
+/* | 31                             15 | 14          0 |
+ * | 0 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 0 |      code     | */
+#define BREAKPOINT_VALUE { 0x00, 0x00, 0x2A, 0x00 }
+#define BREAKPOINT_LENGTH   4
+#define DECR_PC_AFTER_BREAK 0
+#define ARCH_ENDIAN_LITTLE
+
+#define LT_ELFCLASS	ELFCLASS64
+#define LT_ELF_MACHINE	EM_LOONGARCH
+
+#define ARCH_HAVE_SIZEOF
+#define ARCH_HAVE_ALIGNOF
+#define ARCH_HAVE_ADD_PLT_ENTRY
+#define ARCH_HAVE_SW_SINGLESTEP
+#define ARCH_HAVE_FETCH_ARG
+#define ARCH_HAVE_FETCH_PACK
+
+#define RLEN		8
+#define ARG_GAR_START	4
+#define ARG_GAR_END	11
+#define ARG_FAR_START	0
+#define ARG_FAR_END	7
+
+#endif /* LTRACE_LOONGARCH_ARCH_H */