diff options
Diffstat (limited to 'deps/v8/src/heap/base/asm/ppc/push_registers_asm.cc')
| -rw-r--r-- | deps/v8/src/heap/base/asm/ppc/push_registers_asm.cc | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/deps/v8/src/heap/base/asm/ppc/push_registers_asm.cc b/deps/v8/src/heap/base/asm/ppc/push_registers_asm.cc new file mode 100644 index 0000000000..f879980556 --- /dev/null +++ b/deps/v8/src/heap/base/asm/ppc/push_registers_asm.cc @@ -0,0 +1,97 @@ +// 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. + +// 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 +asm( +#if defined(_AIX) + ".csect .text[PR] \n" + ".align 2 \n" + ".globl .PushAllRegistersAndIterateStack, hidden \n" + ".PushAllRegistersAndIterateStack: \n" +#else + ".text \n" + ".align 2 \n" + ".globl PushAllRegistersAndIterateStack \n" + ".type PushAllRegistersAndIterateStack, %function \n" + ".hidden PushAllRegistersAndIterateStack \n" + "PushAllRegistersAndIterateStack: \n" +#endif + // Push all callee-saved registers. + // lr, TOC pointer, r16 to r31. 160 bytes. + // The parameter save area shall be allocated by the caller. 112 bytes. + // At anytime, SP (r1) needs to be multiple of 16 (i.e. 16-aligned). + " mflr 0 \n" + " std 0, 16(1) \n" +#if defined(_AIX) + " std 2, 40(1) \n" +#else + " std 2, 24(1) \n" +#endif + " stdu 1, -256(1) \n" + " std 14, 112(1) \n" + " std 15, 120(1) \n" + " std 16, 128(1) \n" + " std 17, 136(1) \n" + " std 18, 144(1) \n" + " std 19, 152(1) \n" + " std 20, 160(1) \n" + " std 21, 168(1) \n" + " std 22, 176(1) \n" + " std 23, 184(1) \n" + " std 24, 192(1) \n" + " std 25, 200(1) \n" + " std 26, 208(1) \n" + " std 27, 216(1) \n" + " std 28, 224(1) \n" + " std 29, 232(1) \n" + " std 30, 240(1) \n" + " std 31, 248(1) \n" + // Pass 1st parameter (r3) unchanged (Stack*). + // Pass 2nd parameter (r4) unchanged (StackVisitor*). + // Save 3rd parameter (r5; IterateStackCallback). + " mr 6, 5 \n" +#if defined(_AIX) + // Set up TOC for callee. + " ld 2,8(5) \n" + // AIX uses function descriptors, which means that + // pointers to functions do not point to code, but + // instead point to metadata about them, hence + // need to deterrence. + " ld 6,0(6) \n" +#endif + // Pass 3rd parameter as sp (stack pointer). + " mr 5, 1 \n" +#if !defined(_AIX) + // Set up r12 to be equal to the callee address (in order for TOC + // relocation). Only needed on LE Linux. + " mr 12, 6 \n" +#endif + // Call the callback. + " mtctr 6 \n" + " bctrl \n" + // Discard all the registers. + " addi 1, 1, 256 \n" + // Restore lr. + " ld 0, 16(1) \n" + " mtlr 0 \n" +#if defined(_AIX) + // Restore TOC pointer. + " ld 2, 40(1) \n" +#else + " ld 2, 24(1) \n" +#endif + " blr \n"); |