sandbox/linux/services/android_i386_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_SERVICES_ANDROID_I386_UCONTEXT_H_
   6 #define SANDBOX_LINUX_SERVICES_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 #include <asm/sigcontext.h>
  15
  16 /* 80-bit floating-point register */
  17 struct _libc_fpreg {
  18   unsigned short significand[4];
  19   unsigned short exponent;
  20 };
  21
  22 /* Simple floating-point state, see FNSTENV instruction */
  23 struct _libc_fpstate {
  24   unsigned long cw;
  25   unsigned long sw;
  26   unsigned long tag;
  27   unsigned long ipoff;
  28   unsigned long cssel;
  29   unsigned long dataoff;
  30   unsigned long datasel;
  31   struct _libc_fpreg _st[8];
  32   unsigned long status;
  33 };
  34
  35 typedef uint32_t greg_t;
  36
  37 typedef struct {
  38   uint32_t gregs[19];
  39   struct _libc_fpstate* fpregs;
  40   uint32_t oldmask;
  41   uint32_t cr2;
  42 } mcontext_t;
  43
  44 enum {
  45   REG_GS = 0,
  46   REG_FS,
  47   REG_ES,
  48   REG_DS,
  49   REG_EDI,
  50   REG_ESI,
  51   REG_EBP,
  52   REG_ESP,
  53   REG_EBX,
  54   REG_EDX,
  55   REG_ECX,
  56   REG_EAX,
  57   REG_TRAPNO,
  58   REG_ERR,
  59   REG_EIP,
  60   REG_CS,
  61   REG_EFL,
  62   REG_UESP,
  63   REG_SS,
  64 };
  65
  66 typedef struct ucontext {
  67   uint32_t uc_flags;
  68   struct ucontext* uc_link;
  69   stack_t uc_stack;
  70   mcontext_t uc_mcontext;
  71   sigset_t uc_sigmask;
  72   struct _libc_fpstate __fpregs_mem;
  73 } ucontext_t;
  74
  75 #else
  76 #include <sys/ucontext.h>
  77 #endif  // __BIONIC_HAVE_UCONTEXT_T
  78
  79 #endif  // SANDBOX_LINUX_SERVICES_ANDROID_I386_UCONTEXT_H_