/usr/include/x86_64-linux-musl/bits/user.h is in musl-dev 0.9.15-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | #undef __WORDSIZE
#define __WORDSIZE 64
typedef struct user_fpregs_struct
{
uint16_t cwd, swd, ftw, fop;
uint64_t rip, rdp;
uint32_t mxcsr, mxcs_mask;
uint32_t st_space[32], xmm_space[64], padding[24];
} elf_fpregset_t;
struct user_regs_struct
{
unsigned long r15, r14, r13, r12, rbp, rbx, r11, r10, r9, r8;
unsigned long rax, rcx, rdx, rsi, rdi, orig_rax, rip;
unsigned long cs, eflags, rsp, ss, fs_base, gs_base, ds, es, fs, gs;
};
#define ELF_NGREG 27
typedef unsigned long long elf_greg_t, elf_gregset_t[ELF_NGREG];
struct user
{
struct user_regs_struct regs;
int u_fpvalid;
struct user_fpregs_struct i387;
unsigned long u_tsize;
unsigned long u_dsize;
unsigned long u_ssize;
unsigned long start_code;
unsigned long start_stack;
long signal;
int reserved;
struct user_regs_struct *u_ar0;
struct user_fpregs_struct *u_fpstate;
unsigned long magic;
char u_comm[32];
unsigned long 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)
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