[Bug target/25967] Add attribute naked for x86

[aldyh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=25967

--- Comment #22 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Author: aldyh
Date: Wed Sep 13 16:07:16 2017
New Revision: 252190

URL: https://gcc.gnu.org/viewcvs?rev=252190&root=gcc&view=rev
Log:
        PR target/25967
        * config/i386/i386.c (ix86_function_naked): New function.
        (ix86_can_use_return_insn_p): Return false for naked functions.
        (ix86_expand_prologue): Skip prologue for naked functions.
        (ix86_expand_epilogue): Skip epilogue for naked functions
        and emit trap instruction.
        (ix86_warn_func_return): New function.
        (ix86_attribute_table): Add "naked" attribute specification.
        (TARGET_WARN_FUNC_RETURN): Define.
        * doc/extend.texi (x86 Function Attributes) <naked>: Document it.

testsuite/ChangeLog:

        PR target/25967
        * gcc.target/i386/naked-1.c: New test.
        * gcc.target/i386/naked-2.c: Ditto.
        * gcc.target/i386/naked-3.c: Ditto.
        * gcc.target/x86_64/abi/ms-sysv/ms-sysv.c: Remove
        do_test_body0 stub function, use attribute "naked" instead.
        * gcc.dg/pr44290-1.c: Use naked_functions effective target.
        * gcc.dg/pr44290-2.c: Ditto.

Added:
    branches/range-gen2/gcc/testsuite/gcc.target/i386/naked-1.c
    branches/range-gen2/gcc/testsuite/gcc.target/i386/naked-2.c
    branches/range-gen2/gcc/testsuite/gcc.target/i386/naked-3.c
Modified:
    branches/range-gen2/gcc/ChangeLog
    branches/range-gen2/gcc/config/i386/i386.c
    branches/range-gen2/gcc/doc/extend.texi
    branches/range-gen2/gcc/testsuite/ChangeLog
    branches/range-gen2/gcc/testsuite/gcc.dg/pr44290-1.c
    branches/range-gen2/gcc/testsuite/gcc.dg/pr44290-2.c
    branches/range-gen2/gcc/testsuite/gcc.target/x86_64/abi/ms-sysv/ms-sysv.c