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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/*
* typedef void (*PushAllRegistersCallback)(SafePointBarrier*, ThreadState*, intptr_t*);
* extern "C" void PushAllRegisters(SafePointBarrier*, ThreadState*, PushAllRegistersCallback)
*/
.type PushAllRegisters, %function
.global PushAllRegisters
.hidden PushAllRegisters
PushAllRegisters:
// Push all callee-saves registers to get them
// on the stack for conservative stack scanning.
// Reserve space for callee-saved registers and return address.
daddiu $sp,$sp,-80
// Save the callee-saved registers and the return address.
sd $s0,0($sp)
sd $s1,8($sp)
sd $s2,16($sp)
sd $s3,24($sp)
sd $s4,32($sp)
sd $s5,40($sp)
sd $s6,48($sp)
sd $s7,56($sp)
sd $ra,64($sp)
// Note: the callee-saved floating point registers do not need to be
// copied to the stack, because fp registers never hold heap pointers
// and so do not need to be kept visible to the garbage collector.
// Pass the two first arguments untouched in a0 and a1 and the
// stack pointer to the callback.
move $t9,$a2
move $a2,$sp
jalr $t9
// Restore return address, adjust stack and return.
// Note: the copied registers do not need to be reloaded here,
// because they were preserved by the called routine.
ld $ra,64($sp)
daddiu $sp,$sp,80
jr $ra
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