[Sparc] Add Sparc V8 support

Summary:
Adds the register class implementation for Sparc.
Adds support for DW_CFA_GNU_window_save.
Adds save and restore context functionality.

Adds getArch() function to each Registers_ class to be able to separate
between DW_CFA_AARCH64_negate_ra_state and DW_CFA_GNU_window_save which
are both represented by the same constant.

On Sparc the return address is the address of the call instruction, so
an offset needs to be added when returning to skip the call instruction
and its delay slot. If the function returns a struct it is also necessary
to skip one extra instruction on Sparc V8.

Reviewers: jyknight, mclow.lists, mstorsjo, compnerd

Reviewed By: jyknight, compnerd

Subscribers: jgorbe, mgorny, christof, llvm-commits, fedor.sergeev, JDevlieghere, ldionne, libcxx-commits

Differential Revision: https://reviews.llvm.org/D55763

llvm-svn: 351044

1 files changed, 18 insertions, 4 deletions

diff --git a/libunwind/src/UnwindCursor.hpp b/libunwind/src/UnwindCursor.hpp
index a13080691843..52439f9b5453 100644
--- a/libunwind/src/UnwindCursor.hpp
+++ b/libunwind/src/UnwindCursor.hpp
@@ -981,6 +981,10 @@ private:
   }
 #endif
 
+#if defined(_LIBUNWIND_TARGET_SPARC)
+  int stepWithCompactEncoding(Registers_sparc &) { return UNW_EINVAL; }
+#endif
+
   bool compactSaysUseDwarf(uint32_t *offset=NULL) const {
     R dummy;
     return compactSaysUseDwarf(dummy, offset);
@@ -1042,6 +1046,11 @@ private:
     return true;
   }
 #endif
+
+#if defined(_LIBUNWIND_TARGET_SPARC)
+  bool compactSaysUseDwarf(Registers_sparc &, uint32_t *) const { return true; }
+#endif
+
 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
 
 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
@@ -1103,6 +1112,11 @@ private:
     return 0;
   }
 #endif
+
+#if defined(_LIBUNWIND_TARGET_SPARC)
+  compact_unwind_encoding_t dwarfEncoding(Registers_sparc &) const { return 0; }
+#endif
+
 #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 
 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
@@ -1443,7 +1457,7 @@ bool UnwindCursor<A, R>::getInfoFromDwarfSection(pint_t pc,
   if (foundFDE) {
     typename CFI_Parser<A>::PrologInfo prolog;
     if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo, pc,
-                                            &prolog)) {
+                                            R::getArch(), &prolog)) {
       // Save off parsed FDE info
       _info.start_ip          = fdeInfo.pcStart;
       _info.end_ip            = fdeInfo.pcEnd;
@@ -1858,7 +1872,7 @@ void UnwindCursor<A, R>::setInfoBasedOnIPRegister(bool isReturnAddress) {
     if (msg == NULL) {
       typename CFI_Parser<A>::PrologInfo prolog;
       if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo,
-                                                                pc, &prolog)) {
+                                              pc, R::getArch(), &prolog)) {
         // save off parsed FDE info
         _info.start_ip         = fdeInfo.pcStart;
         _info.end_ip           = fdeInfo.pcEnd;
@@ -1887,8 +1901,8 @@ void UnwindCursor<A, R>::setInfoBasedOnIPRegister(bool isReturnAddress) {
       // Double check this FDE is for a function that includes the pc.
       if ((fdeInfo.pcStart <= pc) && (pc < fdeInfo.pcEnd)) {
         typename CFI_Parser<A>::PrologInfo prolog;
-        if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo,
-                                                cieInfo, pc, &prolog)) {
+        if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo,
+                                                pc, R::getArch(), &prolog)) {
           // save off parsed FDE info
           _info.start_ip         = fdeInfo.pcStart;
           _info.end_ip           = fdeInfo.pcEnd;