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gcc/:
* common.opt (fsplit-stack): New option.
* opts.c (decode_options): Set flag_split_stack to final value.
* target.def (supports_split_stack): New hook.
* gcc.c (STACK_SPLIT_SPEC): Define.
(LINK_COMMAND_SPEC): Use STACK_SPLIT_SPEC.
* doc/invoke.texi (Option Summary): Mention -fsplit-stack.
(Code Gen Options): Document -fsplit-stack.
* doc/extend.texi (Function Attributes): Mention no_split_stack.
(Function Attributes): Document no_split_stack.
* doc/tm.texi.in (Stack Smashing Protection): Add @hook
TARGET_SUPPORTS_SPLIT_STACK.
* doc/tm.texi: Rebuild.
* function.c (thread_prologue_and_epilogue_insns): If
flag_split_stack, add split stack prologue.
* explow.c (allocate_dynamic_stack_space): Support -fsplit-stack.
* varasm.c (saw_no_split_stack): New static variable.
(assemble_start_function): Set saw_no_split_stack if the function
has the no_split_stack attribute.
(file_end_indicate_split_stack): New function.
* output.h (file_end_indicate_split_stack): Declare.
* libgcc-std.ver (GCC_4.6.0): Add -fsplit-stack support variables
and function.
* doc/libgcc.texi (Miscellaneous routines): Document -fsplit-stack
routines.
* config/i386/i386.c (ix86_option_override_internal): Don't set
expand_builtin_va_start to NULL if -fsplit-stack.
(ix86_function_regparm): Reduce local regparm by 1 for 32-bit
-fsplit-stack.
(ix86_va_start): If -fsplit-stack, get overflow pointer from
scratch register set by prologue.
(ix86_code_end): If -fsplit-stack, call
file_end_indicate_split_stack.
(ix86_supports_split_stack): New static function.
(SPLIT_STACK_AVAILABLE): Define.
(split_stack_prologue_scratch_regno): New static function.
(split_stack_fn): New static variable.
(ix86_expand_split_stack_prologue): New function.
(ix86_live_on_entry): New static function.
(ix86_legitimate_address_p): Handle UNSPEC_STACK_CHECK.
(output_pic_addr_const): Likewise.
(i386_asm_output_addr_const_extra): Likewise.
(ix86_expand_call): Change return type to rtx. Return the new
call instruction.
(TARGET_SUPPORTS_SPLIT_STACK): Define.
(TARGET_EXTRA_LIVE_ON_ENTRY): Define.
* config/i386/i386.md (UNSPEC_STACK_CHECK): Define.
(split_stack_prologue, split_stack_return): New insns.
(split_stack_space_check): New insn.
* config/i386/i386.h (struct machine_function): Add
split_stack_varargs_pointer field.
* config/i386/linux.h (TARGET_CAN_SPLIT_STACK): Define.
(TARGET_THREAD_SPLIT_STACK_OFFSET): Define.
* config/i386/linux64.h (TARGET_CAN_SPLIT_STACK): Define.
(TARGET_THREAD_SPLIT_STACK_OFFSET): Define.
* config/i386/i386-protos.h (ix86_expand_split_stack_prologue):
Declare.
(ix86_expand_call): Update declaration.
gcc/c-family/:
* c-common.c (c_common_attribute_table): Add no_split_stack.
(handle_no_split_stack_attribute): New static function.
gcc/testsuite/:
* lib/target-supports.exp (check_effective_target_split_stack):
New procedure.
* gcc.dg/split-1.c: New test.
* gcc.dg/split-2.c: New test.
* gcc.dg/split-3.c: New test.
* gcc.dg/split-4.c: New test.
libgcc/:
* generic-morestack.h: New file.
* generic-morestack.c: New file.
* generic-morestack-thread.c: New file.
* config/i386/morestack.S: New file.
* config/t-stack: New file.
* config/i386/t-stack-i386: New file.
* config.host (i[34567]86-*-linux* and friends): Add t-stack and
i386/t-stack-i386 to tmake_file.
From-SVN: r164661
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