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// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Push all callee-saved registers to get them on the stack for conservative
// stack scanning.
//
// See asm/x64/push_registers_clang.cc for why the function is not generated
// using clang.
//
// Do not depend on V8_TARGET_OS_* defines as some embedders may override the
// GN toolchain (e.g. ChromeOS) and not provide them.
asm(".text \n"
".set noreorder \n"
".global PushAllRegistersAndIterateStack \n"
".type PushAllRegistersAndIterateStack, %function \n"
".hidden PushAllRegistersAndIterateStack \n"
"PushAllRegistersAndIterateStack: \n"
// Push all callee-saved registers and save return address.
" daddiu $sp, $sp, -96 \n"
" sd $ra, 88($sp) \n"
" sd $s8, 80($sp) \n"
" sd $sp, 72($sp) \n"
" sd $gp, 64($sp) \n"
" sd $s7, 56($sp) \n"
" sd $s6, 48($sp) \n"
" sd $s5, 40($sp) \n"
" sd $s4, 32($sp) \n"
" sd $s3, 24($sp) \n"
" sd $s2, 16($sp) \n"
" sd $s1, 8($sp) \n"
" sd $s0, 0($sp) \n"
// Maintain frame pointer.
" move $s8, $sp \n"
// Pass 1st parameter (a0) unchanged (Stack*).
// Pass 2nd parameter (a1) unchanged (StackVisitor*).
// Save 3rd parameter (a2; IterateStackCallback).
" move $a3, $a2 \n"
// Call the callback.
" jalr $a3 \n"
// Delay slot: Pass 3rd parameter as sp (stack pointer).
" move $a2, $sp \n"
// Load return address.
" ld $ra, 88($sp) \n"
// Restore frame pointer.
" ld $s8, 80($sp) \n"
" jr $ra \n"
// Delay slot: Discard all callee-saved registers.
" daddiu $sp, $sp, 96 \n");
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