[RISC-V] Port Mono for RISC-V 64 Arch (1/3) lp64d ABI (#83714)

* support abi lp64d for RISC-V 64

* format

Author: Xinlong-Wu

src/mono/mono.proj

@@ -656,7 +656,7 @@
       <_Objcopy Condition="'$(TargetsAndroid)' == 'true' or '$(TargetsLinuxBionic)' == 'true'">$(ANDROID_NDK_ROOT)/toolchains/llvm/prebuilt/$(MonoToolchainPrebuiltOS)/bin/llvm-objcopy</_Objcopy>
       <_Objcopy Condition="'$(TargetsLinuxMusl)' == 'true' and '$(CrossBuild)' != 'true'">objcopy</_Objcopy>
 
-      <_ObjcopyPrefix Condition="'$(MonoCrossDir)' != '' and '$(Platform)' == 'riscv64'">llvm-objcopy-</_ObjcopyPrefix>
+      <_ObjcopyPrefix Condition="'$(MonoCrossDir)' != '' and '$(Platform)' == 'riscv64' and $(_Objcopy) == ''">llvm-objcopy-</_ObjcopyPrefix>
     </PropertyGroup>
     <!-- test viability of objcopy command -->
     <Exec Condition="'$(BuildMonoAOTCrossCompilerOnly)' != 'true' and ('$(TargetsLinux)' == 'true' or '$(TargetsAndroid)' == 'true' or '$(TargetsLinuxBionic)' == 'true')" Command="$(_Objcopy) -V" IgnoreStandardErrorWarningFormat="true" ContinueOnError="WarnAndContinue" IgnoreExitCode="true" EchoOff="true" ConsoleToMsBuild="true">

src/mono/mono/arch/riscv/riscv-codegen.h

@@ -293,7 +293,8 @@ enum {
 	 (RISCV_BITS ((ins), 12, 8) << 12) | (RISCV_SIGN ((ins)) << 20))
 
 // Check a value for validity as an immediate.
-
+#define RISCV_VALID_IMM(value)	 \
+	(((gint32)value) == (value))
 #define RISCV_VALID_I_IMM(value) \
 	(RISCV_DECODE_I_IMM (RISCV_ENCODE_I_IMM ((value))) == (value))
 #define RISCV_VALID_S_IMM(value) \

src/mono/mono/metadata/object-offsets.h

@@ -255,6 +255,9 @@ DECL_OFFSET(MonoLMF, eip)
 DECL_OFFSET(MonoLMF, gregs)
 DECL_OFFSET(MonoLMF, fregs)
 #elif defined(TARGET_RISCV)
+DECL_OFFSET(MonoLMF, lmf_addr)
+DECL_OFFSET(MonoLMF, pc)
+DECL_OFFSET(MonoLMF, gregs)
 DECL_OFFSET(MonoContext, gregs)
 DECL_OFFSET(MonoContext, fregs)
 #endif
@@ -314,6 +317,13 @@ DECL_OFFSET(CallContext, stack_size)
 DECL_OFFSET(CallContext, stack)
 #endif
 
+#if defined(TARGET_RISCV)
+DECL_OFFSET(CallContext, gregs)
+DECL_OFFSET(CallContext, fregs)
+DECL_OFFSET(CallContext, stack_size)
+DECL_OFFSET(CallContext, stack)
+#endif
+
 #if defined(TARGET_X86)
 DECL_OFFSET(GSharedVtCallInfo, stack_usage)
 DECL_OFFSET(GSharedVtCallInfo, vret_slot)

src/mono/mono/mini/helpers.c

@@ -69,7 +69,11 @@ static const gint16 opidx [] = {
 
 #endif
 
+#ifdef TARGET_RISCV64
+#define ARCH_PREFIX "riscv64-linux-gnu-"
+#else
 #define ARCH_PREFIX ""
+#endif
 //#define ARCH_PREFIX "powerpc64-linux-gnu-"
 
 const char*