From 016f8b583ccb019421be82a917c1218a6875241e Mon Sep 17 00:00:00 2001
From: Xiaolin Zhao <zhaoxiaolin@loongson.cn>
Date: Wed, 27 Jul 2022 15:47:31 +0800
Subject: [PATCH] LoongArch64: Add target architecture selection

Co-developed-by: Qiqi Huang <huangqiqi@loongson.cn>
---
 src/lj_arch.h | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/src/lj_arch.h b/src/lj_arch.h
index 882c99cb..891d12c5 100644
--- a/src/lj_arch.h
+++ b/src/lj_arch.h
@@ -31,6 +31,8 @@
 #define LUAJIT_ARCH_mips32	6
 #define LUAJIT_ARCH_MIPS64	7
 #define LUAJIT_ARCH_mips64	7
+#define LUAJIT_ARCH_LOONGARCH64	8
+#define LUAJIT_ARCH_loongarch64	8
 
 /* Target OS. */
 #define LUAJIT_OS_OTHER		0
@@ -65,6 +67,8 @@
 #define LUAJIT_TARGET	LUAJIT_ARCH_MIPS64
 #elif defined(__mips__) || defined(__mips) || defined(__MIPS__) || defined(__MIPS)
 #define LUAJIT_TARGET	LUAJIT_ARCH_MIPS32
+#elif defined(__loongarch64)
+#define LUAJIT_TARGET	LUAJIT_ARCH_LOONGARCH64
 #else
 #error "No support for this architecture (yet)"
 #endif
@@ -432,6 +436,20 @@
 #define LJ_ARCH_VERSION		10
 #endif
 
+#elif LUAJIT_TARGET == LUAJIT_ARCH_LOONGARCH64
+#define LJ_ARCH_NAME		"loongarch64"
+#define LJ_ARCH_BITS		64
+#define LJ_ARCH_ENDIAN		LUAJIT_LE
+#define LJ_TARGET_LOONGARCH64	1
+#define LJ_TARGET_GC64		1
+#define LJ_TARGET_EHRETREG	4
+#define LJ_TARGET_EHRAREG	1
+#define LJ_TARGET_JUMPRANGE	27	/* +-2^27 = +-128MB */
+#define LJ_TARGET_MASKSHIFT	1
+#define LJ_TARGET_MASKROT	1
+#define LJ_TARGET_UNIFYROT	2	/* Want only IR_BROR. */
+#define LJ_ARCH_NUMMODE		LJ_NUMMODE_DUAL
+
 #else
 #error "No target architecture defined"
 #endif
@@ -462,6 +480,16 @@
 #error "Need at least GCC 4.8 or newer"
 #endif
 #endif
+#elif LJ_TARGET_LOONGARCH64
+#if __clang__
+#if ((__clang_major__ < 8) || ((__clang_major__ == 8) && __clang_minor__ < 0)) && !defined(__NX_TOOLCHAIN_MAJOR__)
+#error "Need at least Clang 8.0 or newer"
+#endif
+#else
+#if (__GNUC__ < 8) || ((__GNUC__ == 8) && __GNUC_MINOR__ < 3)
+#error "Need at least GCC 8.3 or newer"
+#endif
+#endif
 #elif !LJ_TARGET_PS3
 #if (__GNUC__ < 4) || ((__GNUC__ == 4) && __GNUC_MINOR__ < 3)
 #error "Need at least GCC 4.3 or newer"
@@ -509,6 +537,10 @@
 /* MIPS32ON64 aka n32 ABI support might be desirable, but difficult. */
 #error "Only n64 ABI supported for MIPS64"
 #endif
+#elif LJ_TARGET_LOONGARCH64
+#if !(defined(_ABILP64) && _LOONGARCH_SIM == _ABILP64)
+#error "Only LOONGARCH lp64d ABI is supported"
+#endif
 #endif
 #endif