[PAL] Update

src/coreclr/debug/di/riscv64/floatconversion.S

@@ -4,9 +4,9 @@
 #include <unixasmmacros.inc>
 
 // Arguments
-//     input: (in A0) the value to be converted to a double
-//     output: the double corresponding to the _NEON128 input value
+//     input: (in A0) the address of the ULONGLONG to be converted to a double
+//     output: the double corresponding to the ULONGLONG input value
 LEAF_ENTRY FPFillR8, .TEXT
-        ld  a0, 0(a0)
-        jalr x0, ra, 0
+        fld  fa0, 0(a0)
+        ret
 LEAF_END FPFillR8, .TEXT

src/coreclr/pal/inc/rt/ntimage.h

@@ -244,7 +244,7 @@ typedef struct _IMAGE_FILE_HEADER {
 #define IMAGE_FILE_MACHINE_ARM64             0xAA64  // ARM64 Little-Endian
 #define IMAGE_FILE_MACHINE_CEE               0xC0EE
 #define IMAGE_FILE_MACHINE_LOONGARCH64       0x6264  // LOONGARCH64.
-#define IMAGE_FILE_MACHINE_RISCV64           0x5641  // RISCV64
+#define IMAGE_FILE_MACHINE_RISCV64           0x5064  // RISCV64
 
 //
 // Directory format.
@@ -1022,7 +1022,7 @@ typedef IMAGE_RELOCATION UNALIGNED *PIMAGE_RELOCATION;
 #define IMAGE_REL_LOONGARCH64_JIR       0x0004
 
 //
-// LOONGARCH64 relocation types
+// RISCV64 relocation types
 //
 #define IMAGE_REL_RISCV64_PC            0x0003
 #define IMAGE_REL_RISCV64_JALR          0x0004

src/coreclr/pal/src/arch/riscv64/dispatchexceptionwrapper.S

@@ -0,0 +1,13 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+//
+// Implementation of the PAL_DispatchExceptionWrapper that is
+// interposed between a function that caused a hardware fault
+// and PAL_DispatchException that throws an SEH exception for
+// the fault, to make the stack unwindable.
+//
+
+#include "unixasmmacros.inc"
+
+// #error "TODO-RISCV64: missing implementation"