Fix relocs errors on riscv64

src/coreclr/jit/emitriscv64.cpp

@@ -1627,7 +1627,11 @@ unsigned emitter::emitOutputCall(const insGroup* ig, BYTE* dst, instrDesc* id, c
         int reg2 = ((int)addr & 1) + 10;
         addr     = addr ^ 1;
 
-        assert(isValidSimm32(addr - (ssize_t)dst));
+        if (!emitComp->IsTargetAbi(CORINFO_NATIVEAOT_ABI))
+        {
+            assert(isValidSimm32(addr - (ssize_t)dst));
+        }
+
         assert((addr & 1) == 0);
 
         dst += 4;
@@ -1642,7 +1646,7 @@ unsigned emitter::emitOutputCall(const insGroup* ig, BYTE* dst, instrDesc* id, c
 #endif
         emitOutput_Instr(dst, 0x00000067 | (REG_DEFAULT_HELPER_CALL_TARGET << 15) | reg2 << 7);
 
-        emitRecordRelocation(dst - 4, (BYTE*)addr, IMAGE_REL_RISCV64_PC);
+        emitRecordRelocation(dst - 4, (BYTE*)addr, IMAGE_REL_RISCV64_JALR);
     }
     else
     {

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

@@ -1024,7 +1024,8 @@ typedef IMAGE_RELOCATION UNALIGNED *PIMAGE_RELOCATION;
 //
 // RISCV64 relocation types
 //
-#define IMAGE_REL_RISCV64_PC            0x0003
+#define IMAGE_REL_RISCV64_PC            0x0002
+#define IMAGE_REL_RISCV64_JALR          0x0004
 
 //
 // CEF relocation types.

src/coreclr/tools/Common/Compiler/DependencyAnalysis/Relocation.cs

@@ -489,6 +489,41 @@ private static unsafe void PutRiscV64PC(uint* pCode, long imm32)
             Debug.Assert(GetRiscV64PC(pCode) == imm32);
         }
 
+        private static unsafe long GetRiscV64JALR(uint* pCode)
+        {
+            uint jalrInstr = *pCode;
+
+            // Extract the 12-bit signed immediate (bits 31:20 of the instruction).
+            long imm = (long)((jalrInstr >> 20) & 0xfff);
+
+            // Sign-extend the immediate.
+            if ((imm & 0x800) != 0)
+                imm |= 0xfffff000;
+
+            return imm;
+        }
+
+        private static unsafe void PutRiscV64JALR(uint* pCode, long imm)
+        {
+            // Verify that we got a valid offset within the 12-bit signed immediate range.
+            Debug.Assert(imm >= -0x800 && imm < 0x800);
+
+            uint jalrInstr = *pCode;
+
+            Debug.Assert((jalrInstr & 0x7f) == 0x17);  // JALR opcode
+
+            // Extract the lower 12 bits of the immediate.
+            uint imm12 = (uint)(imm & 0xfff);
+
+            // Assemble the JALR instruction with the immediate.
+            jalrInstr &= ~0xfff00000;
+            jalrInstr |= (imm12 << 20);
+
+            *pCode = jalrInstr;
+
+            Debug.Assert(GetRiscV64JALR(pCode) == imm);
+        }
+
         public Relocation(RelocType relocType, int offset, ISymbolNode target)
         {
             RelocType = relocType;
@@ -549,6 +584,9 @@ public static unsafe void WriteValue(RelocType relocType, void* location, long v
                 case RelocType.IMAGE_REL_BASED_RISCV64_PC:
                     PutRiscV64PC((uint*)location, value);
                     break;
+                case RelocType.IMAGE_REL_BASED_RISCV64_JALR:
+                    PutRiscV64JALR((uint*)location, value);
+                    break;
                 default:
                     Debug.Fail("Invalid RelocType: " + relocType);
                     break;
@@ -616,6 +654,8 @@ public static unsafe long ReadValue(RelocType relocType, void* location)
                     return (long)GetLoongArch64JIR((uint*)location);
                 case RelocType.IMAGE_REL_BASED_RISCV64_PC:
                     return (long)GetRiscV64PC((uint*)location);
+                case RelocType.IMAGE_REL_BASED_RISCV64_JALR:
+                    return (long)GetRiscV64JALR((uint*)location);
                 default:
                     Debug.Fail("Invalid RelocType: " + relocType);
                     return 0;

src/coreclr/tools/Common/JitInterface/CorInfoImpl.cs

@@ -4026,12 +4026,15 @@ private static RelocType GetRelocType(TargetArchitecture targetArchitecture, ush
                 }
                 case TargetArchitecture.RiscV64:
                 {
-                    const ushort IMAGE_REL_RISCV64_PC = 3;
+                    const ushort IMAGE_REL_RISCV64_PC = 2;
+                    const ushort IMAGE_REL_RISCV64_JALR = 4;
 
                     switch (fRelocType)
                     {
                         case IMAGE_REL_RISCV64_PC:
                             return RelocType.IMAGE_REL_BASED_RISCV64_PC;
+                        case IMAGE_REL_RISCV64_JALR:
+                            return RelocType.IMAGE_REL_BASED_RISCV64_JALR;
                         default:
                             Debug.Fail("Invalid RelocType: " + fRelocType);
                             return 0;

src/coreclr/tools/aot/ILCompiler.ReadyToRun/ObjectWriter/RelocationHelper.cs

@@ -239,6 +239,12 @@ public void ProcessRelocation(RelocType relocationType, int sourceRVA, int targe
                         delta = targetRVA - sourceRVA;
                         break;
                     }
+                case RelocType.IMAGE_REL_BASED_RISCV64_JALR:
+                    {
+                        relocationLength = 8;
+                        delta = targetRVA - sourceRVA;
+                        break;
+                    }
 
                 default:
                     throw new NotSupportedException();
@@ -257,7 +263,8 @@ public void ProcessRelocation(RelocType relocationType, int sourceRVA, int targe
                              (relocationType == RelocType.IMAGE_REL_BASED_ARM64_PAGEOFFSET_12A) ||
                              (relocationType == RelocType.IMAGE_REL_BASED_LOONGARCH64_PC) ||
                              (relocationType == RelocType.IMAGE_REL_BASED_LOONGARCH64_JIR) ||
-                             (relocationType == RelocType.IMAGE_REL_BASED_RISCV64_PC)
+                             (relocationType == RelocType.IMAGE_REL_BASED_RISCV64_PC) ||
+                             (relocationType == RelocType.IMAGE_REL_BASED_RISCV64_JALR)
                              ) && (value != 0))
                         {
                             throw new NotSupportedException();