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x86_64: implement error trait

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This is useful for describing errors that we pass up.

BUG=chromium:797868
TEST=build_tests passes on all architectures
TEST=crosvm runs on caroline

Change-Id: Ied456015e74830d3f1f465fca1151682c9148eb5
Reviewed-on: https://chromium-review.googlesource.com/961603
Commit-Ready: Sonny Rao <sonnyrao@chromium.org>
Tested-by: Sonny Rao <sonnyrao@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
This commit is contained in:
Sonny Rao 2018-03-12 18:00:21 -07:00 committed by chrome-bot
parent 657c1850ab
commit 8f73ccc45d
1 changed files with 40 additions and 0 deletions
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40
x86_64/src/lib.rs
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@ -59,6 +59,8 @@ mod regs;
use std::mem;
use std::result;
use std::error::{self, Error as X86Error};
use std::fmt::{self, Display};
use std::fs::File;
use std::ffi::CStr;
use std::sync::{Arc, Mutex};
@ -106,6 +108,44 @@ pub enum Error {
/// Invalid e820 setup params.
E820Configuration,
}
impl error::Error for Error {
fn description(&self) -> &str {
match self {
&Error::ConfigureSystem => "Error configuring the system",
&Error::CpuSetup(_) => "Error configuring the VCPU",
&Error::CloneEventFd(_) => "Unable to clone an EventFd",
&Error::CreateEventFd(_) => "Unable to make an EventFd",
&Error::KernelOffsetPastEnd =>
"The kernel extends past the end of RAM",
&Error::RegisterConfiguration(_) =>
"Error configuring the VCPU registers",
&Error::FpuRegisterConfiguration(_) =>
"Error configuring the VCPU floating point registers",
&Error::RegisterIrqfd(_) => "Error registering an IrqFd",
&Error::SegmentRegisterConfiguration(_) =>
"Error configuring the VCPU segment registers",
&Error::LoadCmdline(_) => "Error Loading command line",
&Error::LoadKernel(_) => "Error Loading Kernel",
&Error::LocalIntConfiguration(_) =>
"Error configuring the VCPU local interrupt",
&Error::MpTableSetup(_) =>
"Error writing MP table to memory",
&Error::ZeroPageSetup =>
"Error writing the zero page of guest memory",
&Error::ZeroPagePastRamEnd =>
"The zero page extends past the end of guest_mem",
&Error::E820Configuration => "Invalid e820 setup params",
}
}
}
impl Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "X86 Arch Error: {}", Error::description(self))
}
}
pub type Result<T> = result::Result<T, Error>;
const BOOT_STACK_POINTER: u64 = 0x8000;