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;; Copyright (C) 2013 Google Inc. All rights reserved.
;;
;; Redistribution and use in source and binary forms, with or without
;; modification, are permitted provided that the following conditions are
;; met:
;;
;; * Redistributions of source code must retain the above copyright
;; notice, this list of conditions and the following disclaimer.
;; * Redistributions in binary form must reproduce the above
;; copyright notice, this list of conditions and the following disclaimer
;; in the documentation and/or other materials provided with the
;; distribution.
;; * Neither the name of Google Inc. nor the names of its
;; contributors may be used to endorse or promote products derived from
;; this software without specific prior written permission.
;;
;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
;; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
;; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
;; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
;; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;
%ifndef X64POSIX
%define X64POSIX 0
%endif
%ifndef X64WIN
%define X64WIN 0
%endif
%ifndef IA32
%define IA32 0
%endif
%ifndef ARM
%define ARM 0
%endif
;; Prefix symbols by '_' if PREFIX is defined.
%ifdef PREFIX
%define mangle(x) _ %+ x
%else
%define mangle(x) x
%endif
; PRIVATE makes a symbol private.
%ifidn __OUTPUT_FORMAT__,elf32
%define PRIVATE :hidden
%elifidn __OUTPUT_FORMAT__,elf64
%define PRIVATE :hidden
%elifidn __OUTPUT_FORMAT__,elfx32
%define PRIVATE :hidden
%elif X64WIN
%define PRIVATE
%else
%define PRIVATE :private_extern
%endif
;; typedef void (*PushAllRegistersCallback)(SafePointBarrier*, ThreadState*, intptr_t*);
;; extern "C" void pushAllRegisters(SafePointBarrier*, ThreadState*, PushAllRegistersCallback)
global mangle(pushAllRegisters) PRIVATE
%if X64POSIX
mangle(pushAllRegisters):
;; Push all callee-saves registers to get them
;; on the stack for conservative stack scanning.
;; We maintain 16-byte alignment at calls (required on Mac).
;; There is an 8-byte return address on the stack and we push
;; 56 bytes which maintains 16-byte stack alignment
;; at the call.
push 0
push rbx
push rbp
push r12
push r13
push r14
push r15
;; Pass the two first arguments unchanged (rdi, rsi)
;; and the stack pointer after pushing callee-saved
;; registers to the callback.
mov r8, rdx
mov rdx, rsp
call r8
;; Pop the callee-saved registers. None of them were
;; modified so no restoring is needed.
add rsp, 56
ret
%elif X64WIN
mangle(pushAllRegisters):
;; Push all callee-saves registers to get them
;; on the stack for conservative stack scanning.
push rsi
push rdi
push rbx
push rbp
push r12
push r13
push r14
push r15
;; Pass the two first arguments unchanged (rcx, rdx)
;; and the stack pointer after pushing callee-saved
;; registers to the callback.
mov r9, r8
mov r8, rsp
call r9
;; Pop the callee-saved registers. None of them were
;; modified so no restoring is needed.
add rsp, 64
ret
%elif IA32
mangle(pushAllRegisters):
;; Push all callee-saves registers to get them
;; on the stack for conservative stack scanning.
;; We maintain 16-byte alignment at calls (required on
;; Mac). There is a 4-byte return address on the stack
;; and we push 28 bytes which maintains 16-byte alignment
;; at the call.
push ebx
push ebp
push esi
push edi
;; Pass the two first arguments unchanged and the
;; stack pointer after pushing callee-save registers
;; to the callback.
mov ecx, [esp + 28]
push esp
push dword [esp + 28]
push dword [esp + 28]
call ecx
;; Pop arguments and the callee-saved registers.
;; None of the callee-saved registers were modified
;; so we do not need to restore them.
add esp, 28
ret
%elif ARM
%error "Yasm does not support arm. Use SaveRegisters_arm.S on arm."
%else
%error "Unsupported platform."
%endif
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