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https://github.com/panpaul/tiny_os
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feat: kernel/syscall: refactor
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27fdf26cc1
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@ -2,17 +2,22 @@ use crate::{objects::*, plat::trap::TrapContextOps};
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use log::trace;
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use uapi::{error::*, syscall::*};
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macro_rules! assert_length {
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($info:expr, $len:expr) => {
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if $info.length() != $len {
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return Err(SysError::InvalidArgument);
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}
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};
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}
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pub fn handle_syscall(tcb: &mut TcbObject) -> SysResult {
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let info = MessageInfo::try_from(tcb.trapframe.get_reg(0))?;
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let info = MessageInfo::try_from(tcb.trapframe.get_reg(REG_MESSAGE_INFO))?;
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// Invalid, Debug*, Yield will bypass the capability check
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match info.label() {
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Syscall::Invalid => return Ok(()),
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Syscall::DebugPutChar => {
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if info.length() != 3 {
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return Err(SysError::InvalidArgument);
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}
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assert_length!(info, 3);
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let c = tcb.trapframe.get_reg(2) as u8 as char;
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crate::print!("{}", c);
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return Ok(());
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@ -25,13 +30,16 @@ pub fn handle_syscall(tcb: &mut TcbObject) -> SysResult {
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};
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let cspace = CNodeCap::try_from(tcb.cspace())?;
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let cap_ptr = tcb.trapframe.get_reg(1);
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let cap_ptr = tcb.trapframe.get_reg(REG_CAP_PTR);
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let cap = cspace.resolve_address_bits(cap_ptr, info.bits()).map_err(SysError::from)?;
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trace!("handle_syscall: info={:?} cap={:?}", info, cap);
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match info.label() {
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Syscall::Send => Ok(()),
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Syscall::InvokeNtfn => {
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assert_length!(info, 2);
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unimplemented!("[Syscall] InvokeNtfn: {:?}", info.label());
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},
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_ => unimplemented!("handle_syscall: {:?}, {:?}", info.label(), cap),
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}
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}
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@ -8,11 +8,11 @@ pub enum Syscall {
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Invalid = 0,
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DebugPutChar = 1,
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Yield = 2,
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Identify = 3,
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Send = 4,
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Recv = 5,
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Call = 6,
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Reply = 7,
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InvokeNtfn = 3,
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// Send = 4,
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// Recv = 5,
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// Call = 6,
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// Reply = 7,
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}
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/* Syscall convention:
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@ -26,6 +26,9 @@ pub enum Syscall {
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* > TODO: figure out how vanilla seL4 handle reply
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*/
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pub const REG_MESSAGE_INFO: usize = 0;
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pub const REG_CAP_PTR: usize = 1;
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/* MessageInfo layout:
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* > | label | bits | length |
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* > | [63:13] | [12:7] | [6:0] |
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