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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SANDBOX_LINUX_SYSTEM_HEADERS_I386_LINUX_UCONTEXT_H_
#define SANDBOX_LINUX_SYSTEM_HEADERS_I386_LINUX_UCONTEXT_H_
#include <stddef.h>
#include <stdint.h>
// This is mostly copied from breakpad (common/android/include/sys/ucontext.h),
// except we do use sigset_t for uc_sigmask instead of a custom type.
// In PNaCl toolchain, sigcontext is not defined. So here declare it.
typedef struct sigaltstack {
void* ss_sp;
int ss_flags;
size_t ss_size;
} stack_t;
/* 80-bit floating-point register */
struct _libc_fpreg {
unsigned short significand[4];
unsigned short exponent;
};
/* Simple floating-point state, see FNSTENV instruction */
struct _libc_fpstate {
unsigned long cw;
unsigned long sw;
unsigned long tag;
unsigned long ipoff;
unsigned long cssel;
unsigned long dataoff;
unsigned long datasel;
struct _libc_fpreg _st[8];
unsigned long status;
};
typedef uint32_t greg_t;
typedef struct {
uint32_t gregs[19];
struct _libc_fpstate* fpregs;
uint32_t oldmask;
uint32_t cr2;
} mcontext_t;
enum {
REG_GS = 0,
REG_FS,
REG_ES,
REG_DS,
REG_EDI,
REG_ESI,
REG_EBP,
REG_ESP,
REG_EBX,
REG_EDX,
REG_ECX,
REG_EAX,
REG_TRAPNO,
REG_ERR,
REG_EIP,
REG_CS,
REG_EFL,
REG_UESP,
REG_SS,
};
typedef struct ucontext {
uint32_t uc_flags;
struct ucontext* uc_link;
stack_t uc_stack;
mcontext_t uc_mcontext;
// Android and PNaCl toolchain's sigset_t has only 32 bits, though Linux
// ABI requires 64 bits.
union {
sigset_t uc_sigmask;
uint32_t kernel_sigmask[2];
};
struct _libc_fpstate __fpregs_mem;
} ucontext_t;
#endif // SANDBOX_LINUX_SYSTEM_HEADERS_I386_LINUX_UCONTEXT_H_
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