| // 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(".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"); |
