sandbox/linux/system_headers/i386_linux_ucontext.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef SANDBOX_LINUX_SYSTEM_HEADERS_ANDROID_I386_UCONTEXT_H_
   6 #define SANDBOX_LINUX_SYSTEM_HEADERS_ANDROID_I386_UCONTEXT_H_
   7
   8 // We do something compatible with glibc. Hopefully, at some point Android will
   9 // provide that for us, and __BIONIC_HAVE_UCONTEXT_T should be defined.
  10 // This is mostly copied from breakpad (common/android/include/sys/ucontext.h),
  11 // except we do use sigset_t for uc_sigmask instead of a custom type.
  12
  13 #if !defined(__BIONIC_HAVE_UCONTEXT_T)
  14 #if !defined(__native_client_nonsfi__)
  15 #include <asm/sigcontext.h>
  16 #else
  17 // In PNaCl toolchain, sigcontext is not defined. So here declare it.
  18 typedef struct sigaltstack {
  19   void* ss_sp;
  20   int ss_flags;
  21   size_t ss_size;
  22 } stack_t;
  23 #endif
  24
  25 /* 80-bit floating-point register */
  26 struct _libc_fpreg {
  27   unsigned short significand[4];
  28   unsigned short exponent;
  29 };
  30
  31 /* Simple floating-point state, see FNSTENV instruction */
  32 struct _libc_fpstate {
  33   unsigned long cw;
  34   unsigned long sw;
  35   unsigned long tag;
  36   unsigned long ipoff;
  37   unsigned long cssel;
  38   unsigned long dataoff;
  39   unsigned long datasel;
  40   struct _libc_fpreg _st[8];
  41   unsigned long status;
  42 };
  43
  44 typedef uint32_t greg_t;
  45
  46 typedef struct {
  47   uint32_t gregs[19];
  48   struct _libc_fpstate* fpregs;
  49   uint32_t oldmask;
  50   uint32_t cr2;
  51 } mcontext_t;
  52
  53 enum {
  54   REG_GS = 0,
  55   REG_FS,
  56   REG_ES,
  57   REG_DS,
  58   REG_EDI,
  59   REG_ESI,
  60   REG_EBP,
  61   REG_ESP,
  62   REG_EBX,
  63   REG_EDX,
  64   REG_ECX,
  65   REG_EAX,
  66   REG_TRAPNO,
  67   REG_ERR,
  68   REG_EIP,
  69   REG_CS,
  70   REG_EFL,
  71   REG_UESP,
  72   REG_SS,
  73 };
  74
  75 typedef struct ucontext {
  76   uint32_t uc_flags;
  77   struct ucontext* uc_link;
  78   stack_t uc_stack;
  79   mcontext_t uc_mcontext;
  80   // Android and PNaCl toolchain's sigset_t has only 32 bits, though Linux
  81   // ABI requires 64 bits.
  82   union {
  83     sigset_t uc_sigmask;
  84     uint32_t kernel_sigmask[2];
  85   };
  86   struct _libc_fpstate __fpregs_mem;
  87 } ucontext_t;
  88
  89 #else
  90 #include <sys/ucontext.h>
  91 #endif  // __BIONIC_HAVE_UCONTEXT_T
  92
  93 #endif  // SANDBOX_LINUX_SYSTEM_HEADERS_ANDROID_I386_UCONTEXT_H_