diff options
Diffstat (limited to 'REORG.TODO/sysdeps/i386/i386-mcount.S')
| -rw-r--r-- | REORG.TODO/sysdeps/i386/i386-mcount.S | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/i386-mcount.S b/REORG.TODO/sysdeps/i386/i386-mcount.S new file mode 100644 index 0000000000..733b8c78e7 --- /dev/null +++ b/REORG.TODO/sysdeps/i386/i386-mcount.S @@ -0,0 +1,79 @@ +/* i386-specific implementation of profiling support. + Copyright (C) 1997-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + +/* We need a special version of the `mcount' function since for ix86 it + must not clobber any register. This has several reasons: + - there is a bug in gcc as of version 2.7.2.2 which prohibits the + use of profiling together with nested functions + - the ELF `fixup' function uses GCC's regparm feature + - some (future) systems might want to pass parameters in registers. */ + + .globl C_SYMBOL_NAME(_mcount) + .type C_SYMBOL_NAME(_mcount), @function + .align ALIGNARG(4) +C_LABEL(_mcount) + /* Save the caller-clobbered registers. */ + pushl %eax + pushl %ecx + pushl %edx + + movl 12(%esp), %edx + movl 4(%ebp), %eax + + /* No need to access the PLT or GOT, __mcount_internal is an + internal function and we can make a relative call. */ + call C_SYMBOL_NAME(__mcount_internal) + + /* Pop the saved registers. Please note that `mcount' has no + return value. */ + popl %edx + popl %ecx + popl %eax + ret + ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(_mcount)) + +#undef mcount +weak_alias (_mcount, mcount) + + /* Same as above, but doesn't require a frame pointer */ + .globl C_SYMBOL_NAME(__fentry__) + .type C_SYMBOL_NAME(__fentry__), @function + .align ALIGNARG(4) +C_LABEL(__fentry__) + /* Save the caller-clobbered registers. */ + pushl %eax + pushl %ecx + pushl %edx + + movl 12(%esp), %edx + movl 16(%esp), %eax + + /* No need to access the PLT or GOT, __mcount_internal is an + internal function and we can make a relative call. */ + call C_SYMBOL_NAME(__mcount_internal) + + /* Pop the saved registers. Please note that `__fentry__' has no + return value. */ + popl %edx + popl %ecx + popl %eax + ret + ASM_SIZE_DIRECTIVE(C_SYMBOL_NAME(__fentry__)) |