Reland [PPC64] Port to ppc64le - initial version

Initial working version of libunwind for PowerPC 64. Tested on
little-endian ppc64 host only.
Based on the existing PowerPC 32 code.

It supports:

- context save/restore (unw_getcontext, unw_init_local, unw_resume)
- read/write from/to saved registers
- backtrace (unw_step)

Patch by Leandro Lupori!

Differential Revision: https://reviews.llvm.org/D41386

Now builds with LIBUNWIND_ENABLE_CROSS_UNWINDING=ON should
work.

llvm-svn: 321680

libunwind/include/__libunwind_config.h

@@ -18,6 +18,7 @@
 #define _LIBUNWIND_HIGHEST_DWARF_REGISTER_X86       8
 #define _LIBUNWIND_HIGHEST_DWARF_REGISTER_X86_64    32
 #define _LIBUNWIND_HIGHEST_DWARF_REGISTER_PPC       112
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER_PPC64     110
 #define _LIBUNWIND_HIGHEST_DWARF_REGISTER_ARM64     95
 #define _LIBUNWIND_HIGHEST_DWARF_REGISTER_ARM       287
 #define _LIBUNWIND_HIGHEST_DWARF_REGISTER_OR1K      31
@@ -39,6 +40,11 @@
 #    define _LIBUNWIND_CURSOR_SIZE 33
 #  endif
 #  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_X86_64
+# elif defined(__powerpc64__)
+#  define _LIBUNWIND_TARGET_PPC64 1
+#  define _LIBUNWIND_CONTEXT_SIZE 136
+#  define _LIBUNWIND_CURSOR_SIZE 148
+#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_PPC64
 # elif defined(__ppc__)
 #  define _LIBUNWIND_TARGET_PPC 1
 #  define _LIBUNWIND_CONTEXT_SIZE 117
@@ -84,13 +90,14 @@
 # define _LIBUNWIND_TARGET_I386
 # define _LIBUNWIND_TARGET_X86_64 1
 # define _LIBUNWIND_TARGET_PPC 1
+# define _LIBUNWIND_TARGET_PPC64 1
 # define _LIBUNWIND_TARGET_AARCH64 1
 # define _LIBUNWIND_TARGET_ARM 1
 # define _LIBUNWIND_TARGET_OR1K 1
 # define _LIBUNWIND_TARGET_MIPS_O32 1
 # define _LIBUNWIND_TARGET_MIPS_N64 1
-# define _LIBUNWIND_CONTEXT_SIZE 128
-# define _LIBUNWIND_CURSOR_SIZE 140
+# define _LIBUNWIND_CONTEXT_SIZE 136
+# define _LIBUNWIND_CURSOR_SIZE 148
 # define _LIBUNWIND_HIGHEST_DWARF_REGISTER 287
 #endif // _LIBUNWIND_IS_NATIVE_ONLY
 

libunwind/include/libunwind.h

@@ -325,6 +325,120 @@ enum {
   UNW_PPC_SPEFSCR = 112
 };
 
+// 64-bit ppc register numbers
+enum {
+  UNW_PPC64_R0  = 0,
+  UNW_PPC64_R1  = 1,
+  UNW_PPC64_R2  = 2,
+  UNW_PPC64_R3  = 3,
+  UNW_PPC64_R4  = 4,
+  UNW_PPC64_R5  = 5,
+  UNW_PPC64_R6  = 6,
+  UNW_PPC64_R7  = 7,
+  UNW_PPC64_R8  = 8,
+  UNW_PPC64_R9  = 9,
+  UNW_PPC64_R10 = 10,
+  UNW_PPC64_R11 = 11,
+  UNW_PPC64_R12 = 12,
+  UNW_PPC64_R13 = 13,
+  UNW_PPC64_R14 = 14,
+  UNW_PPC64_R15 = 15,
+  UNW_PPC64_R16 = 16,
+  UNW_PPC64_R17 = 17,
+  UNW_PPC64_R18 = 18,
+  UNW_PPC64_R19 = 19,
+  UNW_PPC64_R20 = 20,
+  UNW_PPC64_R21 = 21,
+  UNW_PPC64_R22 = 22,
+  UNW_PPC64_R23 = 23,
+  UNW_PPC64_R24 = 24,
+  UNW_PPC64_R25 = 25,
+  UNW_PPC64_R26 = 26,
+  UNW_PPC64_R27 = 27,
+  UNW_PPC64_R28 = 28,
+  UNW_PPC64_R29 = 29,
+  UNW_PPC64_R30 = 30,
+  UNW_PPC64_R31 = 31,
+  UNW_PPC64_F0  = 32,
+  UNW_PPC64_F1  = 33,
+  UNW_PPC64_F2  = 34,
+  UNW_PPC64_F3  = 35,
+  UNW_PPC64_F4  = 36,
+  UNW_PPC64_F5  = 37,
+  UNW_PPC64_F6  = 38,
+  UNW_PPC64_F7  = 39,
+  UNW_PPC64_F8  = 40,
+  UNW_PPC64_F9  = 41,
+  UNW_PPC64_F10 = 42,
+  UNW_PPC64_F11 = 43,
+  UNW_PPC64_F12 = 44,
+  UNW_PPC64_F13 = 45,
+  UNW_PPC64_F14 = 46,
+  UNW_PPC64_F15 = 47,
+  UNW_PPC64_F16 = 48,
+  UNW_PPC64_F17 = 49,
+  UNW_PPC64_F18 = 50,
+  UNW_PPC64_F19 = 51,
+  UNW_PPC64_F20 = 52,
+  UNW_PPC64_F21 = 53,
+  UNW_PPC64_F22 = 54,
+  UNW_PPC64_F23 = 55,
+  UNW_PPC64_F24 = 56,
+  UNW_PPC64_F25 = 57,
+  UNW_PPC64_F26 = 58,
+  UNW_PPC64_F27 = 59,
+  UNW_PPC64_F28 = 60,
+  UNW_PPC64_F29 = 61,
+  UNW_PPC64_F30 = 62,
+  UNW_PPC64_F31 = 63,
+  UNW_PPC64_LR  = 64,
+  UNW_PPC64_CTR = 65,
+  UNW_PPC64_CR0 = 66,
+  UNW_PPC64_CR1 = 67,
+  UNW_PPC64_CR2 = 68,
+  UNW_PPC64_CR3 = 69,
+  UNW_PPC64_CR4 = 70,
+  UNW_PPC64_CR5 = 71,
+  UNW_PPC64_CR6 = 72,
+  UNW_PPC64_CR7 = 73,
+  UNW_PPC64_XER = 74,
+  UNW_PPC64_V0  = 75,
+  UNW_PPC64_V1  = 76,
+  UNW_PPC64_V2  = 77,
+  UNW_PPC64_V3  = 78,
+  UNW_PPC64_V4  = 79,
+  UNW_PPC64_V5  = 80,
+  UNW_PPC64_V6  = 81,
+  UNW_PPC64_V7  = 82,
+  UNW_PPC64_V8  = 83,
+  UNW_PPC64_V9  = 84,
+  UNW_PPC64_V10 = 85,
+  UNW_PPC64_V11 = 86,
+  UNW_PPC64_V12 = 87,
+  UNW_PPC64_V13 = 88,
+  UNW_PPC64_V14 = 89,
+  UNW_PPC64_V15 = 90,
+  UNW_PPC64_V16 = 91,
+  UNW_PPC64_V17 = 92,
+  UNW_PPC64_V18 = 93,
+  UNW_PPC64_V19 = 94,
+  UNW_PPC64_V20 = 95,
+  UNW_PPC64_V21 = 96,
+  UNW_PPC64_V22 = 97,
+  UNW_PPC64_V23 = 98,
+  UNW_PPC64_V24 = 99,
+  UNW_PPC64_V25 = 100,
+  UNW_PPC64_V26 = 101,
+  UNW_PPC64_V27 = 102,
+  UNW_PPC64_V28 = 103,
+  UNW_PPC64_V29 = 104,
+  UNW_PPC64_V30 = 105,
+  UNW_PPC64_V31 = 106,
+  UNW_PPC64_VRSAVE  = 107,
+  UNW_PPC64_VSCR    = 108,
+  UNW_PPC64_FPSCR   = 109
+};
+
 // 64-bit ARM64 registers
 enum {
   UNW_ARM64_X0  = 0,

libunwind/src/AddressSpace.hpp

@@ -697,6 +697,13 @@ struct unw_addr_space_ppc : public unw_addr_space {
   RemoteAddressSpace<Pointer32<BigEndian>> oas;
 };
 
+/// unw_addr_space_ppc is the concrete instance that a unw_addr_space_t points
+/// to when examining a 64-bit PowerPC process.
+struct unw_addr_space_ppc64 : public unw_addr_space {
+  unw_addr_space_ppc64(task_t task) : oas(task) {}
+  RemoteAddressSpace<Pointer64<LittleEndian>> oas;
+};
+
 #endif // UNW_REMOTE
 
 } // namespace libunwind