xtensa: fix xtensa_fallback_frame_state for call0 ABI

2015-09-15  Max Filippov  <jcmvbkbc@gmail.com>
gcc/
	* config/xtensa/xtensa.h (DWARF_ALT_FRAME_RETURN_COLUMN): New
	definition.
	(DWARF_FRAME_REGISTERS): Reserve space for one extra register in
	call0 ABI.

libgcc/
	* config/xtensa/linux-unwind.h (xtensa_fallback_frame_state):
	Add support for call0 ABI.

From-SVN: r227809

gcc/ChangeLog

 2015-09-15  Max Filippov  <jcmvbkbc@gmail.com>
 
+	* config/xtensa/xtensa.h (DWARF_ALT_FRAME_RETURN_COLUMN): New
+	definition.
+	(DWARF_FRAME_REGISTERS): Reserve space for one extra register in
+	call0 ABI.
+
+2015-09-15  Max Filippov  <jcmvbkbc@gmail.com>
+
 	* config/xtensa/xtensa.c (xtensa_call_tls_desc): Use a10 or a2
 	to pass TLS call argument, according to current ABI.
 	* config/xtensa/xtensa.md (tls_call pattern): Use callx8 or

gcc/config/xtensa/xtensa.h

@@ -813,7 +813,9 @@ typedef struct xtensa_args
    for debugging.  */
 #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, 0)
 #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (0)
-#define DWARF_FRAME_REGISTERS 16
+#define DWARF_ALT_FRAME_RETURN_COLUMN 16
+#define DWARF_FRAME_REGISTERS (DWARF_ALT_FRAME_RETURN_COLUMN		\
+			       + (TARGET_WINDOWED_ABI ? 0 : 1))
 #define EH_RETURN_DATA_REGNO(N) ((N) < 2 ? (N) + 2 : INVALID_REGNUM)
 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL)			\
   (flag_pic								\

libgcc/ChangeLog

+2015-09-15  Max Filippov  <jcmvbkbc@gmail.com>
+
+	* config/xtensa/linux-unwind.h (xtensa_fallback_frame_state):
+	Add support for call0 ABI.
+
 2015-09-13  John David Anglin  <danglin@gcc.gnu.org>
 
 	* config/pa/fptr.c (SIGN_EXTEND): Cast -1 to unsigned.

libgcc/config/xtensa/linux-unwind.h

@@ -52,7 +52,6 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #define ENTRY_BYTE 0x36
 #endif
 
-#ifdef __XTENSA_WINDOWED_ABI__
 #define MD_FALLBACK_FRAME_STATE_FOR xtensa_fallback_frame_state
 
 static _Unwind_Reason_Code
@@ -61,6 +60,10 @@ xtensa_fallback_frame_state (struct _Unwind_Context *context,
 {
   unsigned char *pc = context->ra;
   struct sigcontext *sc;
+#if defined(__XTENSA_CALL0_ABI__)
+  _Unwind_Ptr new_cfa;
+  int i;
+#endif
 
   struct rt_sigframe {
     siginfo_t info;
@@ -76,6 +79,7 @@ xtensa_fallback_frame_state (struct _Unwind_Context *context,
       || pc[5] != SYSC_BYTE2)
     return _URC_END_OF_STACK;
 
+#if defined(__XTENSA_WINDOWED_ABI__)
   rt_ = context->sp;
   sc = &rt_->uc.uc_mcontext;
   fs->signal_regs = (_Unwind_Word *) sc->sc_a;
@@ -90,11 +94,33 @@ xtensa_fallback_frame_state (struct _Unwind_Context *context,
    }
   else
     fs->signal_ra = sc->sc_pc;
+#elif defined(__XTENSA_CALL0_ABI__)
+  rt_ = context->cfa;
+  sc = &rt_->uc.uc_mcontext;
+
+  new_cfa = (_Unwind_Ptr) sc;
+  fs->regs.cfa_how = CFA_REG_OFFSET;
+  fs->regs.cfa_reg = __LIBGCC_STACK_POINTER_REGNUM__;
+  fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa;
+
+  for (i = 0; i < 16; i++)
+    {
+      fs->regs.reg[i].how = REG_SAVED_OFFSET;
+      fs->regs.reg[i].loc.offset = (_Unwind_Ptr) &(sc->sc_a[i]) - new_cfa;
+    }
+
+  fs->regs.reg[__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__].how =
+    REG_SAVED_VAL_OFFSET;
+  fs->regs.reg[__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__].loc.offset =
+    (_Unwind_Ptr) (sc->sc_pc) - new_cfa;
+  fs->retaddr_column = __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__;
+#else
+#error Unsupported Xtensa ABI
+#endif
 
   fs->signal_frame = 1;
   return _URC_NO_REASON;
 }
 
-#endif /* __XTENSA_WINDOWED_ABI__ */
 
 #endif /* ifdef inhibit_libc  */