diff options
Diffstat (limited to 'REORG.TODO/sysdeps/x86_64/_mcount.S')
| -rw-r--r-- | REORG.TODO/sysdeps/x86_64/_mcount.S | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/x86_64/_mcount.S b/REORG.TODO/sysdeps/x86_64/_mcount.S new file mode 100644 index 0000000000..bcf0957752 --- /dev/null +++ b/REORG.TODO/sysdeps/x86_64/_mcount.S @@ -0,0 +1,125 @@ +/* Machine-specific calling sequence for `mcount' profiling function. x86-64 version. + Copyright (C) 2002-2017 Free Software Foundation, Inc. + Contributed by Andreas Jaeger <aj@suse.de>. + This file is part of the GNU C Library. + + 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/>. */ + +/* Assembly stub to invoke _mcount(). Compiler generated code calls + this stub after executing a function's prologue and without saving any + registers. It is therefore necessary to preserve %rcx, %rdx, %rsi, %rdi, + %r8, %r9 as they may contain function arguments. */ + +#include <sysdep.h> + +ENTRY(_mcount) + /* Allocate space for 7 registers. */ + subq $56,%rsp + cfi_adjust_cfa_offset (56) + movq %rax,(%rsp) + cfi_rel_offset (rax, 0) + movq %rcx,8(%rsp) + cfi_rel_offset (rcx, 8) + movq %rdx,16(%rsp) + cfi_rel_offset (rdx, 16) + movq %rsi,24(%rsp) + cfi_rel_offset (rsi, 24) + movq %rdi,32(%rsp) + cfi_rel_offset (rdi, 32) + movq %r8,40(%rsp) + cfi_rel_offset (r8, 40) + movq %r9,48(%rsp) + cfi_rel_offset (r9, 48) + + /* Setup parameter for __mcount_internal. */ + /* selfpc is the return address on the stack. */ + movq 56(%rsp),%rsi + /* Get frompc via the frame pointer. */ + movq 8(%rbp),%rdi + call C_SYMBOL_NAME(__mcount_internal) + /* Pop the saved registers. Please note that `mcount' has no + return value. */ + movq 48(%rsp),%r9 + cfi_restore (r9) + movq 40(%rsp),%r8 + cfi_restore (r8) + movq 32(%rsp),%rdi + cfi_restore (rdi) + movq 24(%rsp),%rsi + cfi_restore (rsi) + movq 16(%rsp),%rdx + cfi_restore (rdx) + movq 8(%rsp),%rcx + cfi_restore (rcx) + movq (%rsp),%rax + cfi_restore (rax) + addq $56,%rsp + cfi_adjust_cfa_offset (-56) + ret +END(_mcount) + +#undef mcount +weak_alias (_mcount, mcount) + +/* __fentry__ is different from _mcount in that it is called before + function prolog. This means (among other things) that it has non-standard + stack alignment on entry: (%RSP & 0xF) == 0. */ + +ENTRY(__fentry__) + /* Allocate space for 7 registers + (+8 bytes for proper stack alignment). */ + subq $64,%rsp + cfi_adjust_cfa_offset (64) + movq %rax,(%rsp) + cfi_rel_offset (rax, 0) + movq %rcx,8(%rsp) + cfi_rel_offset (rcx, 8) + movq %rdx,16(%rsp) + cfi_rel_offset (rdx, 16) + movq %rsi,24(%rsp) + cfi_rel_offset (rsi, 24) + movq %rdi,32(%rsp) + cfi_rel_offset (rdi, 32) + movq %r8,40(%rsp) + cfi_rel_offset (r8, 40) + movq %r9,48(%rsp) + cfi_rel_offset (r9, 48) + + /* Setup parameter for __mcount_internal. */ + /* selfpc is the return address on the stack. */ + movq 64(%rsp),%rsi + /* caller is the return address above it */ + movq 72(%rsp),%rdi + call C_SYMBOL_NAME(__mcount_internal) + /* Pop the saved registers. Please note that `__fentry__' has no + return value. */ + movq 48(%rsp),%r9 + cfi_restore (r9) + movq 40(%rsp),%r8 + cfi_restore (r8) + movq 32(%rsp),%rdi + cfi_restore (rdi) + movq 24(%rsp),%rsi + cfi_restore (rsi) + movq 16(%rsp),%rdx + cfi_restore (rdx) + movq 8(%rsp),%rcx + cfi_restore (rcx) + movq (%rsp),%rax + cfi_restore (rax) + addq $64,%rsp + cfi_adjust_cfa_offset (-64) + ret +END(__fentry__) |