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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 #include <stddef.h>
9 #include <stdint.h>
10 
11 // We do something compatible with glibc. Hopefully, at some point Android will
12 // provide that for us, and __BIONIC_HAVE_UCONTEXT_T should be defined.
13 // This is mostly copied from breakpad (common/android/include/sys/ucontext.h),
14 // except we do use sigset_t for uc_sigmask instead of a custom type.
15 
16 #if !defined(__BIONIC_HAVE_UCONTEXT_T)
17 #if !defined(__native_client_nonsfi__)
18 #include <asm/sigcontext.h>
19 #else
20 // In PNaCl toolchain, sigcontext is not defined. So here declare it.
21 typedef struct sigaltstack {
22   void* ss_sp;
23   int ss_flags;
24   size_t ss_size;
25 } stack_t;
26 #endif
27 
28 /* 80-bit floating-point register */
29 struct _libc_fpreg {
30   unsigned short significand[4];
31   unsigned short exponent;
32 };
33 
34 /* Simple floating-point state, see FNSTENV instruction */
35 struct _libc_fpstate {
36   unsigned long cw;
37   unsigned long sw;
38   unsigned long tag;
39   unsigned long ipoff;
40   unsigned long cssel;
41   unsigned long dataoff;
42   unsigned long datasel;
43   struct _libc_fpreg _st[8];
44   unsigned long status;
45 };
46 
47 typedef uint32_t greg_t;
48 
49 typedef struct {
50   uint32_t gregs[19];
51   struct _libc_fpstate* fpregs;
52   uint32_t oldmask;
53   uint32_t cr2;
54 } mcontext_t;
55 
56 enum {
57   REG_GS = 0,
58   REG_FS,
59   REG_ES,
60   REG_DS,
61   REG_EDI,
62   REG_ESI,
63   REG_EBP,
64   REG_ESP,
65   REG_EBX,
66   REG_EDX,
67   REG_ECX,
68   REG_EAX,
69   REG_TRAPNO,
70   REG_ERR,
71   REG_EIP,
72   REG_CS,
73   REG_EFL,
74   REG_UESP,
75   REG_SS,
76 };
77 
78 typedef struct ucontext {
79   uint32_t uc_flags;
80   struct ucontext* uc_link;
81   stack_t uc_stack;
82   mcontext_t uc_mcontext;
83   // Android and PNaCl toolchain's sigset_t has only 32 bits, though Linux
84   // ABI requires 64 bits.
85   union {
86     sigset_t uc_sigmask;
87     uint32_t kernel_sigmask[2];
88   };
89   struct _libc_fpstate __fpregs_mem;
90 } ucontext_t;
91 
92 #else
93 #include <sys/ucontext.h>
94 #endif  // __BIONIC_HAVE_UCONTEXT_T
95 
96 #endif  // SANDBOX_LINUX_SYSTEM_HEADERS_ANDROID_I386_UCONTEXT_H_
97