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// Copyright 2021 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.
#include <src/heap/base/stack.h>
// Save all callee-saved registers in the specified buffer.
// extern "C" void SaveCalleeSavedRegisters(intptr_t* buffer);
// See asm/x64/save_registers_asm.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.
// 11 64-bit registers = 11 intprt_t
static_assert(heap::base::Stack::NumberOfCalleeSavedRegisters == 11,
"Mismatch in the number of callee-saved registers");
static_assert(sizeof(intptr_t) == 8, "Mismatch in word size");
asm(".text \n"
".global SaveCalleeSavedRegisters \n"
".type SaveCalleeSavedRegisters, %function \n"
".hidden SaveCalleeSavedRegisters \n"
"SaveCalleeSavedRegisters: \n"
// $a0: [ intptr_t* buffer ]
// Save the callee-saved registers.
" st.d $s8, $a0, 0 \n"
" st.d $sp, $a0, 8 \n"
" st.d $fp, $a0, 16 \n"
" st.d $s7, $a0, 24 \n"
" st.d $s6, $a0, 32 \n"
" st.d $s5, $a0, 40 \n"
" st.d $s4, $a0, 48 \n"
" st.d $s3, $a0, 56 \n"
" st.d $s2, $a0, 64 \n"
" st.d $s1, $a0, 72 \n"
" st.d $s0, $a0, 80 \n"
// Return.
" jirl $zero, $ra, 0 \n");
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