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use super::{CommonThreadInfo, NT_Elf};
use crate::{errors::ThreadInfoError, minidump_cpu::RawContextCPU, Pid};
use nix::sys::ptrace;
type Result<T> = std::result::Result<T, ThreadInfoError>;
// Not defined by libc because this works only for cores support VFP
#[allow(non_camel_case_types)]
#[repr(C)]
#[derive(Debug, Eq, Hash, PartialEq, Copy, Clone, Default)]
pub struct user_fpregs_struct {
pub fpregs: [u64; 32],
pub fpscr: u32,
}
#[repr(C)]
#[derive(Debug, Eq, Hash, PartialEq, Copy, Clone, Default)]
pub struct user_regs_struct {
uregs: [u32; 18],
}
#[derive(Debug)]
pub struct ThreadInfoArm {
pub stack_pointer: usize,
pub tgid: Pid, // thread group id
pub ppid: Pid, // parent process
pub regs: user_regs_struct,
pub fpregs: user_fpregs_struct,
}
impl CommonThreadInfo for ThreadInfoArm {}
impl ThreadInfoArm {
// nix currently doesn't support PTRACE_GETFPREGS, so we have to do it ourselves
fn getfpregs(pid: Pid) -> Result<user_fpregs_struct> {
Self::ptrace_get_data_via_io(
0x4204 as ptrace::RequestType, // PTRACE_GETREGSET
Some(NT_Elf::NT_ARM_VFP),
nix::unistd::Pid::from_raw(pid),
)
}
// nix currently doesn't support PTRACE_GETREGS, so we have to do it ourselves
fn getregs(pid: Pid) -> Result<user_regs_struct> {
Self::ptrace_get_data::<user_regs_struct>(
ptrace::Request::PTRACE_GETREGS as ptrace::RequestType,
None,
nix::unistd::Pid::from_raw(pid),
)
}
pub fn get_instruction_pointer(&self) -> usize {
self.regs.uregs[15] as usize
}
pub fn fill_cpu_context(&self, out: &mut RawContextCPU) {
out.context_flags =
crate::minidump_format::format::ContextFlagsArm::CONTEXT_ARM_FULL.bits();
out.iregs.copy_from_slice(&self.regs.uregs[..16]);
out.cpsr = self.regs.uregs[16];
out.float_save.fpscr = self.fpregs.fpscr as u64;
out.float_save.regs = self.fpregs.fpregs;
}
pub fn create_impl(_pid: Pid, tid: Pid) -> Result<Self> {
let (ppid, tgid) = Self::get_ppid_and_tgid(tid)?;
let regs = Self::getregs(tid)?;
let fpregs = Self::getfpregs(tid).unwrap_or(Default::default());
let stack_pointer = regs.uregs[13] as usize;
Ok(ThreadInfoArm {
stack_pointer,
tgid,
ppid,
regs,
fpregs,
})
}
}