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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.
// S390 ABI source:
// http://refspecs.linuxbase.org/ELF/zSeries/lzsabi0_zSeries.html
asm(".text \n"
".align 8 \n"
".globl PushAllRegistersAndIterateStack \n"
".type PushAllRegistersAndIterateStack, %function \n"
".hidden PushAllRegistersAndIterateStack \n"
"PushAllRegistersAndIterateStack: \n"
// Push all callee-saved registers.
// r6-r13, r14 and sp(r15)
" stmg %r6, %sp, 48(%sp) \n"
// Allocate frame.
" lay %sp, -160(%sp) \n"
// Pass 1st parameter (r2) unchanged (Stack*).
// Pass 2nd parameter (r3) unchanged (StackVisitor*).
// Save 3rd parameter (r4; IterateStackCallback).
" lgr %r5, %r4 \n"
// Pass sp as 3rd parameter. 160+48 to point
// to callee saved region stored above.
" lay %r4, 208(%sp) \n"
// Call the callback.
" basr %r14, %r5 \n"
" lmg %r14,%sp, 272(%sp) \n"
" br %r14 \n");
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