ARM EH: Extend DWARF_FRAME_REGISTERS count to 48 and map reg# 256 -> 16.

gcc/unwind-pnacl.h

 #ifndef UNWIND_PNACL_H
 #define UNWIND_PNACL_H
 
 #define STACK_GROWS_DOWNWARD 1
 
 /* Define: __builtin_dwarf_sp_column */
 #if defined(__x86_64__)
 #define __builtin_dwarf_sp_column() 7
 #elif defined(__i386__)
 #define __builtin_dwarf_sp_column() 4
 #elif defined(__arm__)
 #define __builtin_dwarf_sp_column() 13
 #elif defined(__mips__)
 #define __builtin_dwarf_sp_column() 29
 #else
 #error "Unknown platform"
 #endif
 
 /* Define: DWARF_FRAME_REGISTERS */
 #ifdef DWARF_FRAME_REGISTERS
 #undef DWARF_FRAME_REGISTERS
 #endif
 
 #if defined(__x86_64__) || defined(__i386__)
 #define DWARF_FRAME_REGISTERS 17
 #elif defined(__arm__)
-#define DWARF_FRAME_REGISTERS 16
+/*
+ * r0-15, and map 256-287 for d0-d31 into regno 16 -> 48.
+ * See:
+ *http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040b/IHI0040B_aadwarf.pdf
+ */
+#define DWARF_FRAME_REGISTERS 48
 #elif defined(__mips__)
 /*
  * Number of hardware registers we use in PNaCl. We have:
  *
  *  - 32 integer registers
  *  - 32 floating point registers
  *  - 8 condition code registers
  *  - 2 accumulator registers (hi and lo)
  */
 #define DWARF_FRAME_REGISTERS 74
@@ skipping 16 matching lines @@
    switch back to using LLVM if these were fixed.
 
    It might be better to switch to using libunwind instead of libgcc_eh
    (see https://code.google.com/p/nativeclient/issues/detail?id=2749).  */
 
 #if defined(__i386__) || defined(__x86_64__)
 /* Assume we are compiling with GCC, which provides a working
    definition of __builtin_init_dwarf_reg_size_table().  */
 
 #elif defined(__arm__)
-/* All regs are 32bit = 4 bytes */
-#define __builtin_init_dwarf_reg_size_table(table) do { \
-  int i; \
-  for (i = 0; i < DWARF_FRAME_REGISTERS; ++i) \
-    table[i] = 4; \
+#define __builtin_init_dwarf_reg_size_table(table) do {                 \
+  int i;                                                                \
+  /* Integer registers are 32bit. */                                    \
+  for (i = 0; i < 16; ++i)                                              \
+    table[i] = 4;                                                       \
+  /* The rest are VFPv3/NEON (64bit). */                                \
+  for (i = 16; i < DWARF_FRAME_REGISTERS; ++i)                          \
+    table[i] = 8;                                                       \
 } while (0)
 
 #elif defined(__mips__)
 /* All regs are 32bit = 4 bytes */
 #define __builtin_init_dwarf_reg_size_table(table) do { \
   int i; \
   for (i = 0; i < DWARF_FRAME_REGISTERS; ++i) \
     table[i] = 4; \
 } while (0)
 
@@ skipping 21 matching lines @@
 #define pnacl_unwind_result1_reg() 2
 #elif defined(__arm__)
 #define pnacl_unwind_result1_reg() 5
 #elif defined(__mips__)
 #define pnacl_unwind_result1_reg() 5
 #else
 #error "unknown platform"
 #endif
 
 #endif /* UNWIND_PNACL_H */
-