kc3-lang/angle/src/common/tls.h

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• Hash : c2c8b062
  Author :
  Date : 2023-05-11T22:38:48
  

  [Risc-V] Fix definition of kAndroidOpenGLTlsSlot.
  
  On Risc-V, ANGLE was using a TLS offset of 3.
  This worked... sometimes!
  On Risc-V, the android OpenGL TLS slot is supposed to be -5,
  as per tls_defines.h.
  
  Tested by running cuttlefish with Swiftshader + ANGLE on Risc-V
  
  Bug: b/273278430
  Change-Id: Ib32f7dbcc158085b75f4befc277a03229ff87152
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4521034
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Auto-Submit: Jean-François Geyelin <jif@chromium.org>
  

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• src/common/tls.h

• //
  // Copyright 2014 The ANGLE 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.
  //
  
  // tls.h: Simple cross-platform interface for thread local storage.
  
  #ifndef COMMON_TLS_H_
  #define COMMON_TLS_H_
  
  #include "common/angleutils.h"
  #include "common/platform.h"
  
  #if defined(ANGLE_PLATFORM_POSIX)
  #    include <errno.h>
  #    include <pthread.h>
  #    include <semaphore.h>
  #elif defined(ANGLE_PLATFORM_WINDOWS)
  #    include <windows.h>
  #endif
  
  namespace gl
  {
  class Context;
  }
  
  namespace angle
  {
  
  #ifdef ANGLE_PLATFORM_WINDOWS
  // TLS does not exist for Windows Store and needs to be emulated
  #    ifdef ANGLE_ENABLE_WINDOWS_UWP
  #        ifndef TLS_OUT_OF_INDEXES
  #            define TLS_OUT_OF_INDEXES static_cast<DWORD>(0xFFFFFFFF)
  #        endif
  #        ifndef CREATE_SUSPENDED
  #            define CREATE_SUSPENDED 0x00000004
  #        endif
  #    endif
  typedef DWORD TLSIndex;
  #    define TLS_INVALID_INDEX (TLS_OUT_OF_INDEXES)
  #elif defined(ANGLE_PLATFORM_POSIX)
  typedef pthread_key_t TLSIndex;
  #    define TLS_INVALID_INDEX (static_cast<angle::TLSIndex>(-1))
  #else
  #    error Unsupported platform.
  #endif
  
  #if defined(ANGLE_PLATFORM_ANDROID)
  
  // TLS_SLOT_OPENGL and TLS_SLOT_OPENGL_API aren't used by bionic itself, but allow the graphics code
  // to access TLS directly rather than using the pthread API.
  //
  // Choose the TLS_SLOT_OPENGL TLS slot with the value that matches value in the header file in
  // bionic(tls_defines.h).  Note that this slot cannot be used when the GLES backend of is in use.
  #    if defined(__arm__) || defined(__aarch64__)
  constexpr size_t kAndroidOpenGLTlsSlot = 3;
  #    elif defined(__i386__) || defined(__x86_64__)
  constexpr size_t kAndroidOpenGLTlsSlot = 3;
  #    elif defined(__riscv)
  constexpr int kAndroidOpenGLTlsSlot = -5;
  #    else
  #        error Unsupported platform.
  #    endif
  
  // The following ASM variant provides a much more performant store/retrieve interface
  // compared to those provided by the pthread library. These have been derived from code
  // in the bionic module of Android ->
  // https://cs.android.com/android/platform/superproject/+/master:bionic/libc/platform/bionic/tls.h;l=30
  
  #    if defined(__aarch64__)
  #        define ANGLE_ANDROID_GET_GL_TLS()                  \
              ({                                              \
                  void **__val;                               \
                  __asm__("mrs %0, tpidr_el0" : "=r"(__val)); \
                  __val;                                      \
              })
  #    elif defined(__arm__)
  #        define ANGLE_ANDROID_GET_GL_TLS()                           \
              ({                                                       \
                  void **__val;                                        \
                  __asm__("mrc p15, 0, %0, c13, c0, 3" : "=r"(__val)); \
                  __val;                                               \
              })
  #    elif defined(__mips__)
  // On mips32r1, this goes via a kernel illegal instruction trap that's
  // optimized for v1
  #        define ANGLE_ANDROID_GET_GL_TLS()       \
              ({                                   \
                  register void **__val asm("v1"); \
                  __asm__(                         \
                      ".set    push\n"             \
                      ".set    mips32r2\n"         \
                      "rdhwr   %0,$29\n"           \
                      ".set    pop\n"              \
                      : "=r"(__val));              \
                  __val;                           \
              })
  #    elif defined(__i386__)
  #        define ANGLE_ANDROID_GET_GL_TLS()                \
              ({                                            \
                  void **__val;                             \
                  __asm__("movl %%gs:0, %0" : "=r"(__val)); \
                  __val;                                    \
              })
  #    elif defined(__x86_64__)
  #        define ANGLE_ANDROID_GET_GL_TLS()               \
              ({                                           \
                  void **__val;                            \
                  __asm__("mov %%fs:0, %0" : "=r"(__val)); \
                  __val;                                   \
              })
  #    elif defined(__riscv)
  #        define ANGLE_ANDROID_GET_GL_TLS()          \
              ({                                      \
                  void **__val;                       \
                  __asm__("mv %0, tp" : "=r"(__val)); \
                  __val;                              \
              })
  #    else
  #        error unsupported architecture
  #    endif
  
  #endif  // ANGLE_PLATFORM_ANDROID
  
  using PthreadKeyDestructor = void (*)(void *);
  TLSIndex CreateTLSIndex(PthreadKeyDestructor destructor);
  bool DestroyTLSIndex(TLSIndex index);
  
  bool SetTLSValue(TLSIndex index, void *value);
  void *GetTLSValue(TLSIndex index);
  
  }  // namespace angle
  
  #endif  // COMMON_TLS_H_
  

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