more syscalls

src/main.rs

@@ -54,9 +54,37 @@ fn ecall_handler(
     let nr = xreg[Reg::A7.0 as usize];
 
     let arg0 = xreg[Reg::A0.0 as usize];
+    let arg1 = xreg[Reg::A1.0 as usize];
+    let arg2 = xreg[Reg::A2.0 as usize];
 
     // https://jborza.com/post/2021-05-11-riscv-linux-syscalls/
+    // https://github.com/torvalds/linux/blob/master/include/uapi/asm-generic/unistd.h
     match nr {
+        // ioctl
+        29 => {
+            let fd = arg0;
+            let request = arg1;
+
+            match request {
+                // TIOCGWINSZ
+                0x5413 => {
+                    let wsz_ptr = xreg[Reg::A2.0 as usize];
+
+                    let mut wsz: libc::winsize = unsafe { std::mem::zeroed() };
+
+                    let r = unsafe { libc::ioctl(fd as i32, libc::TIOCGWINSZ, &mut wsz) };
+
+                    xreg[Reg::A0.0 as usize] = r as u32;
+                    if r >= 0 {
+                        mem.store_u16(wsz_ptr, wsz.ws_row)?;
+                        mem.store_u16(wsz_ptr + 2, wsz.ws_col)?;
+                        mem.store_u16(wsz_ptr + 4, wsz.ws_xpixel)?;
+                        mem.store_u16(wsz_ptr + 6, wsz.ws_ypixel)?;
+                    }
+                }
+                _ => todo!("unknown ioctl: {request}"),
+            }
+        }
         // read
         63 => {
             let fd = arg0;
@@ -91,8 +119,39 @@ fn ecall_handler(
 
             xreg[Reg::A0.0 as usize] = ret;
         }
-        // exit
+        // https://man7.org/linux/man-pages/man3/writev.3p.html
-        93 => {
+        66 => {
+            let fd = arg0;
+            let iovec = arg1;
+            let iovcnt = arg2;
+
+            let mut written = 0;
+
+            for i in 0..iovcnt {
+                let iov_ptr = mem.load_u32(iovec + i * 8)?;
+                let iov_len = mem.load_u32(iovec + i * 8 + 4)?;
+
+                let data = mem.slice(iov_ptr, iov_len)?;
+
+                let len = unsafe { libc::write(fd as i32, data.as_ptr().cast(), data.len()) };
+                let ret = if len < 0 {
+                    (-std::io::Error::last_os_error().raw_os_error().unwrap_or(1)) as u32
+                } else {
+                    len as u32
+                };
+
+                if (ret as i32) < 0 {
+                    xreg[Reg::A0.0 as usize] = ret;
+                    return Ok(());
+                } else {
+                    written += ret;
+                }
+            }
+
+            xreg[Reg::A0.0 as usize] = written;
+        }
+        // exit | exit_group
+        93 | 94 => {
             return Err(emu::Status::Exit {
                 code: xreg[Reg::A0.0 as usize] as i32,
             });
@@ -104,6 +163,14 @@ fn ecall_handler(
 
             xreg[Reg::A0.0 as usize] = 1; // thread ID
         }
+        // ppoll - called for some stdin/stdout/stderr check.
+        414 => {
+            // musl uses ppoll to batch check whether FDs 0,1,2 are invalid,
+            // and opens /dev/null for them if they are.
+            // They're always valid here, so just get out.
+
+            xreg[Reg::A0.0 as usize] = 0;
+        }
         _ => {
             todo!("unkonwn syscall: {nr}");
         }