Merge remote-tracking branch 'origin/aarch64-rebase'

src/arch/aarch64.rs

@@ -1,62 +1,129 @@
+use core::{mem, slice};
+use core::ops::{Deref, DerefMut};
+
 use super::error::{Error, Result};
 
-pub unsafe fn syscall0(mut a: usize) -> Result<usize> {
-    llvm_asm!("svc   0"
-          : "={x0}"(a)
-          : "{x8}"(a)
-          : "x0", "x8"
-          : "volatile");
+macro_rules! syscall {
+    ($($name:ident($a:ident, $($b:ident, $($c:ident, $($d:ident, $($e:ident, $($f:ident, )?)?)?)?)?);)+) => {
+        $(
+            pub unsafe fn $name(mut $a: usize, $(mut $b: usize, $($c: usize, $($d: usize, $($e: usize, $($f: usize)?)?)?)?)?) -> Result<usize> {
+                asm!(
+                    "svc 0",
+                    in("x8") $a,
+                    $(
+                        inout("x0") $b,
+                        $(
+                            in("x1") $c,
+                            $(
+                                in("x2") $d,
+                                $(
+                                    in("x3") $e,
+                                    $(
+                                        in("x4") $f,
+                                    )?
+                                )?
+                            )?
+                        )?
+                    )?
+                    options(nostack),
+                );
 
-    Error::demux(a)
+                Error::demux($a)
+            }
+        )+
+    };
 }
 
-pub unsafe fn syscall1(mut a: usize, b: usize) -> Result<usize> {
-    llvm_asm!("svc   0"
-          : "={x0}"(a)
-          : "{x8}"(a), "{x0}"(b)
-          : "x0", "x8"
-          : "volatile");
-
-    Error::demux(a)
+syscall! {
+    syscall0(a,);
+    syscall1(a, b,);
+    syscall2(a, b, c,);
+    syscall3(a, b, c, d,);
+    syscall4(a, b, c, d, e,);
+    syscall5(a, b, c, d, e, f,);
 }
 
-pub unsafe fn syscall2(mut a: usize, b: usize, c: usize) -> Result<usize> {
-    llvm_asm!("svc   0"
-          : "={x0}"(a)
-          : "{x8}"(a), "{x0}"(b), "{x1}"(c)
-          : "x0", "x1", "x8"
-          : "volatile");
-
-    Error::demux(a)
+#[derive(Copy, Clone, Debug, Default)]
+#[repr(C)]
+pub struct IntRegisters {
+    pub elr_el1: usize,
+    pub tpidr_el0: usize,
+    pub tpidrro_el0: usize,
+    pub spsr_el1: usize,
+    pub esr_el1: usize,
+    pub sp_el0: usize,      // Shouldn't be used if interrupt occurred at EL1
+    pub padding: usize,     // To keep the struct even number aligned 
+    pub x30: usize,
+    pub x29: usize,
+    pub x28: usize,
+    pub x27: usize,
+    pub x26: usize,
+    pub x25: usize,
+    pub x24: usize,
+    pub x23: usize,
+    pub x22: usize,
+    pub x21: usize,
+    pub x20: usize,
+    pub x19: usize,
+    pub x18: usize,
+    pub x17: usize,
+    pub x16: usize,
+    pub x15: usize,
+    pub x14: usize,
+    pub x13: usize,
+    pub x12: usize,
+    pub x11: usize,
+    pub x10: usize,
+    pub x9: usize,
+    pub x8: usize,
+    pub x7: usize,
+    pub x6: usize,
+    pub x5: usize,
+    pub x4: usize,
+    pub x3: usize,
+    pub x2: usize,
+    pub x1: usize,
+    pub x0: usize
 }
 
-pub unsafe fn syscall3(mut a: usize, b: usize, c: usize, d: usize) -> Result<usize> {
-    llvm_asm!("svc   0"
-          : "={x0}"(a)
-          : "{x8}"(a), "{x0}"(b), "{x1}"(c), "{x2}"(d)
-          : "x0", "x1", "x2", "x8"
-          : "volatile");
-
-    Error::demux(a)
+impl Deref for IntRegisters {
+    type Target = [u8];
+    fn deref(&self) -> &[u8] {
+        unsafe {
+            slice::from_raw_parts(self as *const IntRegisters as *const u8, mem::size_of::<IntRegisters>())
+        }
+    }
 }
 
-pub unsafe fn syscall4(mut a: usize, b: usize, c: usize, d: usize, e: usize) -> Result<usize> {
-    llvm_asm!("svc   0"
-          : "={x0}"(a)
-          : "{x8}"(a), "{x0}"(b), "{x1}"(c), "{x2}"(d), "{x3}"(e)
-          : "x0", "x1", "x2", "x3", "x8"
-          : "volatile");
-
-    Error::demux(a)
+impl DerefMut for IntRegisters {
+    fn deref_mut(&mut self) -> &mut [u8] {
+        unsafe {
+            slice::from_raw_parts_mut(self as *mut IntRegisters as *mut u8, mem::size_of::<IntRegisters>())
+        }
+    }
 }
 
-pub unsafe fn syscall5(mut a: usize, b: usize, c: usize, d: usize, e: usize, f: usize)
-    -> Result<usize> {
-    llvm_asm!("svc   0"
-          : "={x0}"(a)
-          : "{x8}"(a), "{x0}"(b), "{x1}"(c), "{x2}"(d), "{x3}"(e), "{x4}"(f)
-          : "x0", "x1", "x2", "x3", "x4", "x8"
-          : "volatile");
-
-    Error::demux(a)
+#[derive(Clone, Copy, Debug, Default)]
+#[repr(packed)]
+pub struct FloatRegisters {
+    pub fp_simd_regs: [u128; 32],
+    pub fpsr: u32,
+    pub fpcr: u32
+}
+
+impl Deref for FloatRegisters {
+    type Target = [u8];
+    fn deref(&self) -> &[u8] {
+        unsafe {
+            slice::from_raw_parts(self as *const FloatRegisters as *const u8, mem::size_of::<FloatRegisters>())
+        }
+    }
+}
+
+impl DerefMut for FloatRegisters {
+    fn deref_mut(&mut self) -> &mut [u8] {
+        unsafe {
+            slice::from_raw_parts_mut(self as *mut FloatRegisters as *mut u8, mem::size_of::<FloatRegisters>())
+        }
+    }
 }