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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.
#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.
//
// PPC ABI source:
// http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi.html
// AIX Runtime process stack:
// https://www.ibm.com/support/knowledgecenter/ssw_aix_71/assembler/idalangref_runtime_process.html
#ifdef __PPC64__
// 20 64-bit registers = 20 intprt_t
static_assert(heap::base::Stack::NumberOfCalleeSavedRegisters == 20,
"Mismatch in the number of callee-saved registers");
static_assert(sizeof(intptr_t) == 8, "Mismatch in word size");
asm(
#if defined(_AIX)
".globl .SaveCalleeSavedRegisters, hidden \n"
".csect .text[PR] \n"
".SaveCalleeSavedRegisters: \n"
#else
".globl SaveCalleeSavedRegisters \n"
".type SaveCalleeSavedRegisters, %function \n"
".hidden SaveCalleeSavedRegisters \n"
"SaveCalleeSavedRegisters: \n"
#endif
// r3: [ intptr_t* buffer ]
// Save the callee-saved registers: lr, TOC pointer (r2), r14-r31.
" mflr 0 \n"
" std 0, 8(3) \n"
" std 2, 16(3) \n"
" std 14, 24(3) \n"
" std 15, 32(3) \n"
" std 16, 40(3) \n"
" std 17, 48(3) \n"
" std 18, 56(3) \n"
" std 19, 64(3) \n"
" std 20, 72(3) \n"
" std 21, 80(3) \n"
" std 22, 88(3) \n"
" std 23, 96(3) \n"
" std 24, 104(3) \n"
" std 25, 112(3) \n"
" std 26, 120(3) \n"
" std 27, 128(3) \n"
" std 28, 136(3) \n"
" std 29, 144(3) \n"
" std 30, 152(3) \n"
" std 31, 160(3) \n"
// Return.
" blr \n");
#else // !__PPC64__
// 20 32-bit registers = 20 intprt_t
static_assert(heap::base::Stack::NumberOfCalleeSavedRegisters == 20,
"Mismatch in the number of callee-saved registers");
static_assert(sizeof(intptr_t) == 4, "Mismatch in word size");
asm(
#if defined(_AIX)
".globl .SaveCalleeSavedRegisters, hidden \n"
".csect .text[PR] \n"
".SaveCalleeSavedRegisters: \n"
#else
".globl SaveCalleeSavedRegisters \n"
".type SaveCalleeSavedRegisters, %function \n"
".hidden SaveCalleeSavedRegisters \n"
"SaveCalleeSavedRegisters: \n"
#endif
// r3: [ intptr_t* buffer ]
// Save the callee-saved registers: lr, TOC pointer (r2), r14-r31.
" mflr 0 \n"
" st 0, 4(3) \n"
" st 2, 8(3) \n"
" st 14, 12(3) \n"
" st 15, 16(3) \n"
" st 16, 20(3) \n"
" st 17, 24(3) \n"
" st 18, 28(3) \n"
" st 19, 32(3) \n"
" st 20, 36(3) \n"
" st 21, 40(3) \n"
" st 22, 44(3) \n"
" st 23, 48(3) \n"
" st 24, 52(3) \n"
" st 25, 56(3) \n"
" st 26, 60(3) \n"
" st 27, 64(3) \n"
" st 28, 68(3) \n"
" st 29, 72(3) \n"
" st 30, 76(3) \n"
" st 31, 80(3) \n"
// Return.
" blr \n");
#endif // __PPC64__
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