[Assembler] Add %pcrel_hi16 and %pcrel_lo16 MIPS relocations

Return the 16 MSB and 16 LSB

src/assembler/mipsrelocations.h

@@ -0,0 +1,70 @@
+#pragma once
+
+#include "QDebug"
+#include "VSRTL/interface/vsrtl_binutils.h"
+#include "relocation.h"
+
+namespace Ripes {
+namespace Assembler {
+
+// pcrel_lo/hi are restricted to 32-bit absolute addresses, so keep computations
+// in this base.
+inline uint32_t pcrel_hi16(const uint32_t val, const uint32_t reloc_addr) {
+  return ((val - (reloc_addr % 0xFFFFF000) + 0x800) >> 16);
+}
+
+template <typename Reg_T>
+Relocation<Reg_T> mips_pcrel_hi() {
+  return Relocation<Reg_T>("%pcrel_hi16",
+                           [](const Reg_T val, const Reg_T reloc_addr)
+                               -> HandleRelocationRes<Reg_T> {
+                             const uint32_t _hi16 = pcrel_hi16(val, reloc_addr);
+                             return {_hi16};
+                           });
+}
+
+template <typename Reg_T>
+Relocation<Reg_T> mips_pcrel_lo() {
+  return Relocation<Reg_T>(
+      "%pcrel_lo16",
+      [](const Reg_T val,
+         const Reg_T reloc_addr) -> HandleRelocationRes<Reg_T> {
+        using Reg_T_S = typename std::make_signed<Reg_T>::type;
+        const uint32_t _hi16 = pcrel_hi16(val, reloc_addr);
+        const uint32_t lo16 = val & 0x0000FFF;
+        return {static_cast<Reg_T>(
+            static_cast<Reg_T_S>(vsrtl::signextend(lo16, 16)))};
+      });
+}
+
+template <typename Reg_T>
+Relocation<Reg_T> mips_hi() {
+  return Relocation<Reg_T>(
+      "%hi",
+      [](const Reg_T val, const Reg_T /*reloc_addr*/)
+          -> HandleRelocationRes<Reg_T> { return {val >> 16 & 0xFFFFFF}; });
+}
+
+template <typename Reg_T>
+Relocation<Reg_T> mips_lo() {
+  return Relocation<Reg_T>(
+      "%lo",
+      [](const Reg_T val, const Reg_T /*reloc_addr*/)
+          -> HandleRelocationRes<Reg_T> { return {val & 0xFFF}; });
+}
+
+template <typename Reg_T>
+RelocationsVec<Reg_T> mipsRelocations() {
+  RelocationsVec<Reg_T> relocations;
+
+  relocations.push_back(
+      std::make_shared<Relocation<Reg_T>>(mips_pcrel_hi<Reg_T>()));
+  relocations.push_back(
+      std::make_shared<Relocation<Reg_T>>(mips_pcrel_lo<Reg_T>()));
+  relocations.push_back(std::make_shared<Relocation<Reg_T>>(mips_hi<Reg_T>()));
+  relocations.push_back(std::make_shared<Relocation<Reg_T>>(mips_lo<Reg_T>()));
+
+  return relocations;
+}
+} // namespace Assembler
+} // namespace Ripes