Implement #include<sys/user.h> and #include<sys/procfs.h>

This patch implements sys/user.h file that works for both x86_64 as well
as aarch64. This include file is used by sys/procfs.h which is needed
dependency for binutils. There is bug in this patch in aarch64 implementation
which is the lack of f128 implementation in rust, thus we can't create cbinding
for long double.

include/sys/user.h

@@ -0,0 +1,11 @@
+#ifndef _SYS_USER_H
+#define _SYS_USER_H
+#if defined(__amd64__) || defined(__amd64) || defined(__x86_64__) || defined(__x86_64) || defined(_M_AMD64)
+#include <arch/x64/user.h>
+#elif defined(__aarch64__)
+#include <arch/aarch64/user.h>
+#else
+#error "Unknown architecture"
+#endif
+
+#endif

src/header/arch_aarch64_user/cbindgen.toml

@@ -0,0 +1,7 @@
+sys_includes = []
+include_guard = "_AARCH64_USER_H"
+language = "C"
+style = "Tag"
+
+[enum]
+prefix_with_name = true

src/header/arch_aarch64_user/mod.rs

@@ -0,0 +1,30 @@
+use crate::platform::types::*;
+
+#[repr(C)]
+pub struct user_regs_struct {
+    pub regs: [c_ulonglong; 31],
+    pub sp: c_ulonglong,
+    pub pc: c_ulonglong,
+    pub pstate: c_ulonglong,
+}
+
+#[repr(C)]
+pub struct user_fpsimd_struct {
+    pub vregs: [c_double; 32], // BUG: rust doesn't have f128 which is equivalent for long double
+    pub fpsr: c_uint,
+    pub fpcr: c_uint,
+}
+
+pub type elf_greg_t = c_ulong;
+pub type elf_gregset_t = [c_ulong; 34];
+pub type elf_fpregset_t = user_fpsimd_struct;
+
+#[no_mangle]
+pub extern "C" fn _cbindgen_only_generates_structs_if_they_are_mentioned_which_is_dumb_aarch64_user(
+    a: user_regs_struct,
+    b: user_fpsimd_struct,
+    c: elf_gregset_t,
+    d: elf_greg_t,
+    e: elf_fpregset_t,
+) {
+}

src/header/sys_user/cbindgen.toml → src/header/arch_x64_user/cbindgen.toml

@@ -1,5 +1,5 @@
 sys_includes = []
-include_guard = "_SYS_USER_H"
+include_guard = "_X64_USER_H"
 language = "C"
 style = "Tag"
 

src/header/sys_user/mod.rs → src/header/arch_x64_user/mod.rs

@@ -48,9 +48,36 @@ pub struct user_regs_struct {
     pub gs: c_ulong,
 }
 
+pub type elf_greg_t = c_ulong;
+
+pub type elf_gregset_t = [c_ulong; 27];
+pub type elf_fpregset_t = user_fpregs_struct;
+#[repr(C)]
+pub struct user {
+    pub regs: user_regs_struct,
+    pub u_fpvalid: c_int,
+    pub i387: user_fpregs_struct,
+    pub u_tsize: c_ulong,
+    pub u_dsize: c_ulong,
+    pub u_ssize: c_ulong,
+    pub start_code: c_ulong,
+    pub start_stack: c_ulong,
+    pub signal: c_long,
+    pub reserved: c_int,
+    pub u_ar0: *mut user_regs_struct,
+    pub u_fpstate: *mut user_fpregs_struct,
+    pub magic: c_ulong,
+    pub u_comm: [c_char; 32],
+    pub u_debugreg: [c_ulong; 8],
+}
+
 #[no_mangle]
-pub extern "C" fn _cbindgen_only_generates_structs_if_they_are_mentioned_which_is_dumb(
+pub extern "C" fn _cbindgen_only_generates_structs_if_they_are_mentioned_which_is_dumb_x86_user(
     a: user_fpregs_struct,
     b: user_regs_struct,
+    c: user,
+    d: elf_gregset_t,
+    e: elf_greg_t,
+    f: elf_fpregset_t,
 ) {
 }

src/header/mod.rs

@@ -47,9 +47,11 @@ pub mod sys_time;
 pub mod sys_timeb;
 //pub mod sys_times;
 pub mod _wctype;
+pub mod arch_aarch64_user;
+pub mod arch_x64_user;
+pub mod sys_procfs;
 pub mod sys_uio;
 pub mod sys_un;
-pub mod sys_user;
 pub mod sys_utsname;
 pub mod sys_wait;
 pub mod termios;

src/header/sys_procfs/cbindgen.toml

@@ -0,0 +1,7 @@
+sys_includes = ["sys/user.h"]
+include_guard = "_SYS_PROCFS_H"
+language = "C"
+style = "Tag"
+
+[enum]
+prefix_with_name = true

src/header/sys_procfs/mod.rs

@@ -0,0 +1,73 @@
+#[cfg(target_arch = "aarch64")]
+use crate::header::arch_aarch64_user::*;
+#[cfg(target_arch = "x86_64")]
+use crate::header::arch_x64_user::*;
+use crate::platform::types::*;
+
+pub const ELF_PRARGSZ: size_t = 80;
+
+#[repr(C)]
+pub struct elf_siginfo {
+    pub si_signo: c_int,
+    pub si_code: c_int,
+    pub si_errno: c_int,
+}
+
+#[repr(C)]
+pub struct time {
+    pub tv_sec: c_long,
+    pub tv_usec: c_long,
+}
+
+#[repr(C)]
+pub struct elf_prstatus {
+    pub pr_info: elf_siginfo,
+    pub pr_cursig: c_short,
+    pub pr_sigpend: c_ulong,
+    pub pr_sighold: c_ulong,
+    pub pr_pid: pid_t,
+    pub pr_ppid: pid_t,
+    pub pr_pgrp: pid_t,
+    pub pr_sid: pid_t,
+    pub pr_utime: time,
+    pub pr_stime: time,
+    pub pr_cutime: time,
+    pub pr_cstime: time,
+    pub pr_reg: elf_gregset_t,
+    pub pr_fpvalid: c_int,
+}
+
+#[repr(C)]
+pub struct elf_prpsinfo {
+    pub pr_state: c_char,
+    pub pr_sname: c_char,
+    pub pr_zomb: c_char,
+    pub pr_nice: c_char,
+    pub pr_flag: c_uint,
+    pub pr_uid: c_uint,
+    pub pr_gid: c_uint,
+    pub pr_pid: c_int,
+    pub pr_ppid: c_int,
+    pub pr_pgrp: c_int,
+    pub pr_sid: c_int,
+    pub pr_fname: [c_char; 16],
+    pub pr_psargs: [c_char; ELF_PRARGSZ],
+}
+
+pub type psaddr_t = *mut c_void;
+pub type prgregset_t = elf_gregset_t;
+pub type prfpregset_t = elf_fpregset_t;
+pub type lwpid_t = pid_t;
+pub type prstatus_t = elf_prstatus;
+pub type prpsinfo_t = elf_prpsinfo;
+
+#[no_mangle]
+pub extern "C" fn _cbindgen_only_generates_structs_if_they_are_mentioned_which_is_dumb_procfs(
+    a: psaddr_t,
+    b: prgregset_t,
+    c: prfpregset_t,
+    d: lwpid_t,
+    e: prstatus_t,
+    f: prpsinfo_t,
+) {
+}