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j immediate decoding fix

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nora 2025-03-10 21:55:18 +01:00
parent 13aec667db
commit 9cdc795824
3 changed files with 59 additions and 10 deletions
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49
src/emu.rs
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@ -172,12 +172,57 @@ fn hash_color(value: u32) -> impl Display {
impl Emulator {
pub fn start_linux(&mut self) -> Status {
// set top of stack. just some yolo address. with no values there. who needs abi?
self[Reg::SP] = 4096 * 8;
self.setup_linux_stack().unwrap();
self.execute()
}
fn setup_linux_stack(&mut self) -> Result<(), Status> {
// set top of stack. just some yolo address. with no values there. who needs abi?
let sp = 4096 * 16;
self[Reg::SP] = sp;
// The x86-64 psABI has a nice diagram of the stack layout (it's not arch specific).
// | Purpose | Start Address | Length |
// |----------------------------------|--------- -----|----------------|
// | Information block of strings etc | (high) | varies |
// | Unspecified | | |
// | Null auxiliary vector entry | | word |
// | Auxiliary vector entries | | two words each |
// | 0 | | word |
// | Environment pointers | | word each |
// | 0 | 4+4*argc+sp | word |
// | Argument pointers | 4+sp | argc words |
// | Argument count | sp | word |
// | Undefined | (low) | |
let xlen = 4;
let mut offset: u32 = 0;
let mut next_word = || {
let n = offset;
offset += xlen;
sp + n
};
// argc
self.mem.store_u32(next_word(), 0)?;
// null terminated argument pointers... (we have none.)
self.mem.store_u32(next_word(), 0)?;
// null terminated environment pointers... (we have none.)
self.mem.store_u32(next_word(), 0)?;
// null terminated auxiliary vector entries
// TODO: add some auxv for the poor process.
self.mem.store_u32(next_word(), 0)?;
Ok(())
}
fn execute(&mut self) -> Status {
loop {
if let Err(err) = self.step() {