invoke.texi (SPARC options): Add -mflat.

gcc/
	* doc/invoke.texi (SPARC options): Add -mflat.
	* config/sparc/sparc.opt: Likewise.
	* config/sparc/sparc-protos.h (sparc_expand_epilogue): Add parameter.
	(sparc_flat_expand_prologue): Declare.
	(sparc_flat_expand_epilogue): Likewise.
	* config/sparc/sparc.h (CPP_CPU_SPEC): Do not handle -msoft-float.
	(CPP_ENDIAN_SPEC): Replace with...
	(CPP_OTHER_SPEC): ...this.  Also handle -mflat and -msoft-float.
	(CPP_SPEC): Adjust to above change.
	(EXTRA_SPECS): Likewise.
	(SPARC_INCOMING_INT_ARG_FIRST): Add TARGET_FLAT handling.
	(INCOMING_REGNO): Likewise.
	(OUTGOING_REGNO): Likewise.
	(LOCAL_REGNO): Likewise.
	(SETUP_FRAME_ADDRESSES): Likewise.
	(FIXED_REGISTERS): Set 0 for %fp.
	(CALL_USED_REGISTERS): Likewise.
	(INITIAL_ELIMINATION_OFFSET): Pass current_function_is_leaf.
	(EXIT_IGNORE_STACK): Define to 1 unconditionally.
	(RETURN_ADDR_REGNUM): Define.
	(RETURN_ADDR_RTX): Use it.
	(INCOMING_RETURN_ADDR_REGNUM): Define.
	(INCOMING_RETURN_ADDR_RTX): Use it.
	(DWARF_FRAME_RETURN_COLUMN): Likewise.
	(EH_RETURN_REGNUM): Define.
	(EH_RETURN_STACKADJ_RTX): Use it.
	(EH_RETURN_HANDLER_RTX): Delete.
	(EPILOGUE_USES): Use them and add TARGET_FLAT handling.
	* config/sparc/sparc.c (apparent_fsize, actual_fsize, num_gfregs):
	Delete.
	(struct machine_function): Add frame_size, apparent_frame_size,
	frame_base_reg, frame_base_offset, n_global_fp_regs and
	save_local_in_regs_p fields.
	(sparc_frame_size, sparc_apparent_frame_size, sparc_frame_base_reg,
	sparc_frame_base_offset, sparc_n_global_fp_regs,
	sparc_save_local_in_regs_p): New macros.
	(sparc_option_override): Error out if -fcall-saved-REG is specified
	for Out registers.
	(eligible_for_restore_insn): Fix formatting.
	(eligible_for_return_delay): Likewise.  Add TARGET_FLAT handling.
	(eligible_for_sibcall_delay): Likewise.
	(RTX_OK_FOR_OFFSET_P, RTX_OK_FOR_OLO10_P): Add MODE parameter.
	(sparc_legitimate_address_p): Adjust to above change.
	(save_global_or_fp_reg_p): New predicate.
	(return_addr_reg_needed_p): Likewise.
	(save_local_or_in_reg_p): Likewise.
	(sparc_compute_frame_size): Use them.  Add TARGET_FLAT handling.
	(SORR_SAVE, SORR_RESTORE): Delete.
	(sorr_pred_t): New typedef.
	(sorr_act_t): New enum.
	(save_or_restore_regs): Rename to...
	(emit_save_or_restore_regs): ...this.  Change type of LOW and HIGH
	parameters, remove ACTION parameter, add LEAF_FUNCTION_P, SAVE_P,
	ACTION_TRUE and ACTION_FALSE parameters.  Implement more general
	mechanism.  Add CFI information for double-word saves in 32-bit mode.
	(emit_adjust_base_to_offset): New function extracted from...
	(emit_save_or_restore_regs): ...this.  Rename the rest to...
	(emit_save_or_restore_regs_global_fp_regs): ...this.
	(emit_save_or_restore_regs_local_in_regs): New function.
	(gen_create_flat_frame_[123]): New functions.
	(sparc_expand_prologue): Use SIZE local variable.  Adjust.
	(sparc_flat_expand_prologue): New function.
	(sparc_asm_function_prologue): Add TARGET_FLAT handling.
	(sparc_expand_epilogue): Use SIZE local variable.  Adjust.
	(sparc_flat_expand_epilogue): New function.
	(sparc_can_use_return_insn_p): Add TARGET_FLAT handling.
	(output_return): Likewise.
	(output_sibcall): Likewise.
	(sparc_output_mi_thunk): Likewise.
	(sparc_frame_pointer_required): Likewise.
	(sparc_conditional_register_usage): If TARGET_FLAT, disable the leaf
	function optimization.
	* config/sparc/sparc.md (flat): New attribute.
	(prologue): Add TARGET_FLAT handling.
	(save_register_window): Disable if TARGET_FLAT.
	(create_flat_frame_[123]): New patterns.
	(epilogue): Add TARGET_FLAT handling.
	(sibcall_epilogue): Likewise.
	(eh_return): New expander.
	(eh_return_internal): New insn and splitter.
	(return_internal): Add TARGET_FLAT handling.
	(untyped_return): Remove bogus test and use RETURN_ADDR_REGNUM.
	(save_stack_nonlocal): Use RETURN_ADDR_REGNUM.
	(nonlocal_goto): Add TARGET_FLAT handling.
	* config/sparc/t-elf: Add -mflat multilib.
	* config/sparc/t-leon: Likewise.
libgcc/
	* config/sparc/linux-unwind.h (STACK_BIAS): Define.
	(sparc64_fallback_frame_state): Use it.
	(sparc64_frob_update_context): Further adjust context.
	* config/sparc/sol2-unwind.h (sparc64_frob_update_context): Likewise.
	* config/sparc/sol2-ci.S: Add TARGET_FLAT handling.
	* config/sparc/sol2-cn.S: Likewise.

Co-Authored-By: Laurent Rougé <laurent.rouge@menta.fr>

From-SVN: r174897

4 files changed, 75 insertions, 9 deletions

diff --git a/libgcc/config/sparc/linux-unwind.h b/libgcc/config/sparc/linux-unwind.h
index adfef6e..c5e7f8d 100644
--- a/libgcc/config/sparc/linux-unwind.h
+++ b/libgcc/config/sparc/linux-unwind.h
@@ -27,6 +27,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 
 #if defined(__arch64__)
 
+#undef STACK_BIAS
+#define STACK_BIAS 2047
+
 /* 64-bit SPARC version */
 #define MD_FALLBACK_FRAME_STATE_FOR sparc64_fallback_frame_state
 
@@ -49,7 +52,8 @@ sparc64_fallback_frame_state (struct _Unwind_Context *context,
   fpu_save_off = regs_off + (16 * 8) + (3 * 8) + (2 * 4);
 
   new_cfa = *(long *)(this_cfa + regs_off + (14 * 8));
-  new_cfa += 2047; /* Stack bias */
+  /* The frame address is %sp + STACK_BIAS in 64-bit mode.  */
+  new_cfa += STACK_BIAS;
   fpu_save = *(long *)(this_cfa + fpu_save_off);
   fs->regs.cfa_how = CFA_REG_OFFSET;
   fs->regs.cfa_reg = __builtin_dwarf_sp_column ();
@@ -112,7 +116,16 @@ sparc64_frob_update_context (struct _Unwind_Context *context,
       && fs->regs.cfa_how == CFA_REG_OFFSET
       && fs->regs.cfa_offset != 0
       && !fs->signal_frame)
-    context->cfa -= 2047;
+    {
+      long i;
+
+      context->cfa -= STACK_BIAS;
+
+      for (i = 0; i < DWARF_FRAME_REGISTERS + 1; ++i)
+	if (fs->regs.reg[i].how == REG_SAVED_OFFSET)
+	  _Unwind_SetGRPtr (context, i,
+			    _Unwind_GetGRPtr (context, i) - STACK_BIAS);
+    }
 }
 
 #else
diff --git a/libgcc/config/sparc/sol2-ci.S b/libgcc/config/sparc/sol2-ci.S
index 8825f79..a89cc20 100644
--- a/libgcc/config/sparc/sol2-ci.S
+++ b/libgcc/config/sparc/sol2-ci.S
@@ -1,6 +1,6 @@
 ! crti.s for solaris 2.0.
 
-!   Copyright (C) 1992, 2008, 2009 Free Software Foundation, Inc.
+!   Copyright (C) 1992, 2008, 2009, 2011 Free Software Foundation, Inc.
 !   Written By David Vinayak Henkel-Wallace, June 1992
 ! 
 ! This file is free software; you can redistribute it and/or modify it
@@ -35,11 +35,22 @@
 	.type	_init,#function
 	.align	4
 _init:
+#ifdef _FLAT
+#ifdef __sparcv9
+	stx     %i7, [%sp+2167]
+	add	%sp, -176, %sp
+#else
+	st	%i7, [%sp+60]
+	add	%sp, -96, %sp
+#endif
+	mov	%o7, %i7
+#else
 #ifdef __sparcv9
 	save	%sp, -176, %sp
 #else
 	save	%sp, -96, %sp
 #endif
+#endif
 
 
 	.section	".fini"
@@ -48,8 +59,19 @@ _init:
 	.type	_fini,#function
 	.align	4
 _fini:
+#ifdef _FLAT
+#ifdef __sparcv9
+	stx     %i7, [%sp+2167]
+	add	%sp, -176, %sp
+#else
+	st      %i7, [%sp+60]
+	add	%sp, -96, %sp
+#endif
+	mov	%o7, %i7
+#else
 #ifdef __sparcv9
 	save	%sp, -176, %sp
 #else
 	save	%sp, -96, %sp
 #endif
+#endif
diff --git a/libgcc/config/sparc/sol2-cn.S b/libgcc/config/sparc/sol2-cn.S
index b92f3cf..08862a7 100644
--- a/libgcc/config/sparc/sol2-cn.S
+++ b/libgcc/config/sparc/sol2-cn.S
@@ -1,6 +1,6 @@
 ! crtn.s for solaris 2.0.
 
-!   Copyright (C) 1992, 2008, 2009 Free Software Foundation, Inc.
+!   Copyright (C) 1992, 2008, 2009, 2011 Free Software Foundation, Inc.
 !   Written By David Vinayak Henkel-Wallace, June 1992
 ! 
 ! This file is free software; you can redistribute it and/or modify it
@@ -28,14 +28,36 @@
 
 	.section	".init"
 	.align		4
-
-	ret
+#ifdef _FLAT
+	mov 	%i7, %o7
+#ifdef __sparcv9
+	ldx     [%sp+2343], %i7
+	sub	%sp, -176, %sp
+#else
+	ld	[%sp+156], %i7
+	sub	%sp, -96, %sp
+#endif
+#else
 	restore
+#endif
+	jmp	%o7+8
+	 nop
 
 	.section	".fini"
 	.align		4
-
-	ret
+#ifdef _FLAT
+	mov 	%i7, %o7
+#ifdef __sparcv9
+	ldx     [%sp+2343], %i7
+	sub	%sp, -176, %sp
+#else
+	ld      [%sp+156], %i7
+	sub	%sp, -96, %sp
+#endif
+#else
 	restore
+#endif
+	jmp	%o7+8
+	 nop
 
 ! Th-th-th-that is all folks!
diff --git a/libgcc/config/sparc/sol2-unwind.h b/libgcc/config/sparc/sol2-unwind.h
index f8b9902..129405e 100644
--- a/libgcc/config/sparc/sol2-unwind.h
+++ b/libgcc/config/sparc/sol2-unwind.h
@@ -164,7 +164,16 @@ sparc64_frob_update_context (struct _Unwind_Context *context,
       && fs->regs.cfa_how == CFA_REG_OFFSET
       && fs->regs.cfa_offset != 0
       && !fs->signal_frame)
-    context->cfa -= STACK_BIAS;
+    {
+      long i;
+
+      context->cfa -= STACK_BIAS;
+
+      for (i = 0; i < DWARF_FRAME_REGISTERS + 1; ++i)
+	if (fs->regs.reg[i].how == REG_SAVED_OFFSET)
+	  _Unwind_SetGRPtr (context, i,
+			    _Unwind_GetGRPtr (context, i) - STACK_BIAS);
+    }
 }
 
 #else