| // Copyright 2020 The Cobalt Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "starboard/shared/pthread/thread_context_internal.h" |
| |
| #if SB_API_VERSION >= 11 |
| |
| #if !defined(__gnu_linux__) // Note: __linux__ is undef'd for Starboard builds. |
| #error "SbThreadContext is only implemented for Linux" |
| #endif |
| |
| #if !(SB_IS_32_BIT || SB_IS_64_BIT) |
| #error "CPU architecture must be either 32-bit or 64-bit" |
| #endif |
| |
| // UCLIBC pretends to be GLIBC. |
| #if (defined(__GLIBC__) || defined(__GNU_LIBRARY__)) && !defined(__UCLIBC__) |
| #define SB_IS_GLIBC 1 |
| #else |
| #define SB_IS_GLIBC 0 |
| #endif |
| |
| SbThreadContextPrivate::SbThreadContextPrivate(ucontext_t* ucontext) { |
| mcontext_t& mcontext = ucontext->uc_mcontext; |
| |
| #if SB_IS_ARCH_X64 |
| // 64-bit X86 (aka X64) |
| ip_ = reinterpret_cast<void*>(mcontext.gregs[REG_RIP]); |
| sp_ = reinterpret_cast<void*>(mcontext.gregs[REG_RSP]); |
| fp_ = reinterpret_cast<void*>(mcontext.gregs[REG_RBP]); |
| #elif SB_IS_ARCH_X86 |
| // 32-bit X86 |
| ip_ = reinterpret_cast<void*>(mcontext.gregs[REG_EIP]); |
| sp_ = reinterpret_cast<void*>(mcontext.gregs[REG_ESP]); |
| fp_ = reinterpret_cast<void*>(mcontext.gregs[REG_EBP]); |
| #elif SB_IS_ARCH_ARM64 |
| // 64-bit ARM |
| ip_ = reinterpret_cast<void*>(mcontext.pc); |
| sp_ = reinterpret_cast<void*>(mcontext.sp); |
| fp_ = reinterpret_cast<void*>(mcontext.regs[29]); |
| lr_ = reinterpret_cast<void*>(mcontext.regs[30]); |
| #elif SB_IS_ARCH_ARM |
| #if SB_IS_GLIBC && ((__GLIBC__ * 100 + __GLIBC_MINOR__) < 204) |
| // 32-bit ARM w/ old GLIBC that used gregs[] |
| ip_ = reinterpret_cast<void*>(mcontext.gregs[R15]); |
| sp_ = reinterpret_cast<void*>(mcontext.gregs[R13]); |
| fp_ = reinterpret_cast<void*>(mcontext.gregs[R11]); |
| lr_ = reinterpret_cast<void*>(mcontext.gregs[R14]); |
| #else |
| // 32-bit ARM |
| ip_ = reinterpret_cast<void*>(mcontext.arm_pc); |
| sp_ = reinterpret_cast<void*>(mcontext.arm_sp); |
| fp_ = reinterpret_cast<void*>(mcontext.arm_fp); |
| lr_ = reinterpret_cast<void*>(mcontext.arm_lr); |
| #endif |
| #else // SB_IS_ARCH_XXX |
| #error "SbThreadContext isn't implemented for this CPU architecture" |
| #endif // SB_IS_ARCH_XXX |
| } |
| |
| #endif // SB_API_VERSION >= 11 |