| /* Machine-specific calling sequence for `mcount' profiling function. x86-64 version. |
| Copyright (C) 2002-2018 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__) |
