musl/include/bits/user.h

#undef __WORDSIZE
#define __WORDSIZE 32

struct user_fpregs_struct
{
	long int cwd;
	long int swd;
	long int twd;
	long int fip;
	long int fcs;
	long int foo;
	long int fos;
	long int st_space[20];
};

struct user_fpxregs_struct
{
	unsigned short int cwd;
	unsigned short int swd;
	unsigned short int twd;
	unsigned short int fop;
	long int fip;
	long int fcs;
	long int foo;
	long int fos;
	long int mxcsr;
	long int reserved;
	long int st_space[32];
	long int xmm_space[32];
	long int padding[56];
};

struct user_regs_struct
{
	long int ebx;
	long int ecx;
	long int edx;
	long int esi;
	long int edi;
	long int ebp;
	long int eax;
	long int xds;
	long int xes;
	long int xfs;
	long int xgs;
	long int orig_eax;
	long int eip;
	long int xcs;
	long int eflags;
	long int esp;
	long int xss;
};

struct user
{
	struct user_regs_struct		regs;
	int				u_fpvalid;
	struct user_fpregs_struct	i387;
	unsigned long int		u_tsize;
	unsigned long int		u_dsize;
	unsigned long int		u_ssize;
	unsigned long			start_code;
	unsigned long			start_stack;
	long int			signal;
	int				reserved;
	struct user_regs_struct		*u_ar0;
	struct user_fpregs_struct	*u_fpstate;
	unsigned long int		magic;
	char				u_comm[32];
	int				u_debugreg[8];
};

#define PAGE_MASK		(~(PAGE_SIZE-1))
#define NBPG			PAGE_SIZE
#define UPAGES			1
#define HOST_TEXT_START_ADDR	(u.start_code)
#define HOST_STACK_END_ADDR	(u.start_stack + u.u_ssize * NBPG)