From: Richard Sandiford <rsandifo@gcc.gnu.org>
Date: Wed, 22 Mar 2006 07:21:00 +0000 (+0000)
Subject: predicates.md (const_call_insn_operand): Allow direct calls to locally-defined functi... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=567b3b825767d85837c2f6e12bbe70d45a664635;p=gcc.git

predicates.md (const_call_insn_operand): Allow direct calls to locally-defined functions if TARGET_ABSOLUTE_ABICALLS.

	* config/mips/predicates.md (const_call_insn_operand): Allow direct
	calls to locally-defined functions if TARGET_ABSOLUTE_ABICALLS.
	* config/mips/mips.md (jal_macro): Test TARGET_ABSOLUTE_ABICALLS.
	Use TARGET_OLDABI instead of !TARGET_NEWABI.
	(loadgp): Use mips_current_loadgp_style.
	(loadgp_noshared): New pattern.
	(sibcall_internal): Use MIPS_CALL.
	(sibcall_value_internal): Likewise.
	(sibcall_value_multiple_internal): Likewise.
	(call_internal): Likewise.
	(call_value_internal): Likewise.
	(call_value_multiple_internal): Likewise.
	(call_split): Use MIPS_CALL and add an 'S' constraint.
	(call_value_split): Likewise.
	(call_value_multiple_split): Likewise.
	* config/mips/mips.opt (-mabicalls): Tweak docstring.
	(-mshared): New option.
	* config/mips/mips-protos.h (mips_loadgp_style): New enum.
	(mips_current_loadgp_style): Declare.
	* config/mips/mips.c (mips_classify_symbol): Avoid using
	SYMBOL_GOT_LOCAL if TARGET_ABSOLUTE_ABICALLS.  Use SYMBOL_GENERAL
	rather than SYMBOL_GOT_GLOBAL for locally-binding symbols if
	TARGET_ABSOLUTE_ABICALLS.
	(override_options): Adjust comments.  Improve the warning that is
	issued when -mabicalls and -G are used together.
	(mips_file_start): Remove comment.
	(mips_current_loadgp_style): New function.
	(mips_gnu_local_gp): New variable.
	(mips_emit_loadgp): Use mips_current_loadgp_style.  Handle
	LOADGP_ABSOLUTE.
	(mips_output_function_prologue): Use mips_current_laodgp_style.
	(mips_expand_prologue): Call mips_emit_loadgp before emitting
	the cprestore instruction.
	(mips_extra_live_on_entry): Fix reversed test.  Don't make $25
	live for TARGET_ABSOLUTE_ABICALLS.
	* config/mips/mips.h (TARGET_ABSOLUTE_ABICALLS): New macro.
	(ASM_SPEC): Pass down -mshared and -mno-shared.
	(MIPS_CALL): New macro.
	* config/mips/netbsd.h (TARGET_OS_CPP_BUILTINS): Remove __ABICALLS__
	definition.
	* doc/invoke.texi (-mabicalls): Update documentation.
	(-mshared): Document.

From-SVN: r112279
---

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index a67d6637c49..1a26929c21f 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -596,9 +596,9 @@ Objective-C and Objective-C++ Dialects}.
 @gccoptlist{-EL  -EB  -march=@var{arch}  -mtune=@var{arch} @gol
 -mips1  -mips2  -mips3  -mips4  -mips32  -mips32r2  -mips64 @gol
 -mips16  -mno-mips16  -mabi=@var{abi}  -mabicalls  -mno-abicalls @gol
--mxgot  -mno-xgot  -mgp32  -mgp64  -mfp32  -mfp64 @gol
--mhard-float  -msoft-float  -msingle-float  -mdouble-float @gol
--mdsp  -mpaired-single  -mips3d @gol
+-mshared  -mno-shared  -mxgot  -mno-xgot  -mgp32  -mgp64  @gol
+-mfp32  -mfp64  -mhard-float  -msoft-float  @gol
+-msingle-float  -mdouble-float  -mdsp  -mpaired-single  -mips3d @gol
 -mlong64  -mlong32  -msym32  -mno-sym32 @gol
 -G@var{num}  -membedded-data  -mno-embedded-data @gol
 -muninit-const-in-rodata  -mno-uninit-const-in-rodata @gol
@@ -10464,8 +10464,29 @@ For information about the O64 ABI, see
 @itemx -mno-abicalls
 @opindex mabicalls
 @opindex mno-abicalls
-Generate (do not generate) SVR4-style position-independent code.
-@option{-mabicalls} is the default for SVR4-based systems.
+Generate (do not generate) code that is suitable for SVR4-style
+dynamic objects.  @option{-mabicalls} is the default for SVR4-based
+systems.
+
+@item -mshared
+@itemx -mno-shared
+Generate (do not generate) code that is fully position-independent.
+This option only affects @option{-mabicalls}.
+
+All @option{-mabicalls} code has traditionally been position-independent,
+regardless of options like @option{-fPIC} and @option{-fpic}.  However,
+as an extension, the GNU toolchain allows executables to use absolute
+accesses for locally-binding symbols.  It can also use shorter GP
+initialization sequences and generate direct calls to locally-defined
+functions.  This mode is selected by @option{-mno-shared}.
+
+@option{-mno-shared} depends on binutils 2.16 or higher and generates
+objects that can only be linked by the GNU linker.  However, the option
+does not affect the ABI of the final executable; it only affects the ABI
+of relocatable objects.  Using @option{-mno-shared} will generally make
+executables both smaller and quicker.
+
+@option{-mshared} is the default.
 
 @item -mxgot
 @itemx -mno-xgot