Fix syscall for macos

Author: AgustinCB

Cargo.toml

@@ -7,4 +7,4 @@ license = "MIT/Apache-2.0"
 name = "sc"
 readme = "README.md"
 repository = "https://github.com/japaric/syscall.rs"
-version = "0.2.2"
+version = "0.2.3"

src/platform/macos-x86_64/mod.rs

@@ -11,11 +11,14 @@
 
 pub mod nr;
 
+const MACOS_SYSCALL_PREFIX: usize = 33554432;
+
 #[inline(always)]
 pub unsafe fn syscall0(n: usize) -> usize {
     let ret: usize;
+    let syscall = n + MACOS_SYSCALL_PREFIX;
     llvm_asm!("syscall" : "={rax}"(ret)
-                   : "{rax}"(n)
+                   : "{rax}"(syscall)
                    : "rcx", "r11", "memory"
                    : "volatile");
     ret
@@ -24,8 +27,9 @@ pub unsafe fn syscall0(n: usize) -> usize {
 #[inline(always)]
 pub unsafe fn syscall1(n: usize, a1: usize) -> usize {
     let ret: usize;
+    let syscall = n + MACOS_SYSCALL_PREFIX;
     llvm_asm!("syscall" : "={rax}"(ret)
-                   : "{rax}"(n), "{rdi}"(a1)
+                   : "{rax}"(syscall), "{rdi}"(a1)
                    : "rcx", "r11", "memory"
                    : "volatile");
     ret
@@ -34,8 +38,9 @@ pub unsafe fn syscall1(n: usize, a1: usize) -> usize {
 #[inline(always)]
 pub unsafe fn syscall2(n: usize, a1: usize, a2: usize) -> usize {
     let ret: usize;
+    let syscall = n + MACOS_SYSCALL_PREFIX;
     llvm_asm!("syscall" : "={rax}"(ret)
-                   : "{rax}"(n), "{rdi}"(a1), "{rsi}"(a2)
+                   : "{rax}"(syscall), "{rdi}"(a1), "{rsi}"(a2)
                    : "rcx", "r11", "memory"
                    : "volatile");
     ret
@@ -44,8 +49,9 @@ pub unsafe fn syscall2(n: usize, a1: usize, a2: usize) -> usize {
 #[inline(always)]
 pub unsafe fn syscall3(n: usize, a1: usize, a2: usize, a3: usize) -> usize {
     let ret: usize;
+    let syscall = n + MACOS_SYSCALL_PREFIX;
     llvm_asm!("syscall" : "={rax}"(ret)
-                   : "{rax}"(n), "{rdi}"(a1), "{rsi}"(a2), "{rdx}"(a3)
+                   : "{rax}"(syscall), "{rdi}"(a1), "{rsi}"(a2), "{rdx}"(a3)
                    : "rcx", "r11", "memory"
                    : "volatile");
     ret
@@ -59,8 +65,9 @@ pub unsafe fn syscall4(n: usize,
                        a4: usize)
                        -> usize {
     let ret: usize;
+    let syscall = n + MACOS_SYSCALL_PREFIX;
     llvm_asm!("syscall" : "={rax}"(ret)
-                   : "{rax}"(n), "{rdi}"(a1), "{rsi}"(a2), "{rdx}"(a3),
+                   : "{rax}"(syscall), "{rdi}"(a1), "{rsi}"(a2), "{rdx}"(a3),
                      "{r10}"(a4)
                    : "rcx", "r11", "memory"
                    : "volatile");
@@ -76,8 +83,9 @@ pub unsafe fn syscall5(n: usize,
                        a5: usize)
                        -> usize {
     let ret: usize;
+    let syscall = n + MACOS_SYSCALL_PREFIX;
     llvm_asm!("syscall" : "={rax}"(ret)
-                   : "{rax}"(n), "{rdi}"(a1), "{rsi}"(a2), "{rdx}"(a3),
+                   : "{rax}"(syscall), "{rdi}"(a1), "{rsi}"(a2), "{rdx}"(a3),
                      "{r10}"(a4), "{r8}"(a5)
                    : "rcx", "r11", "memory"
                    : "volatile");
@@ -94,8 +102,9 @@ pub unsafe fn syscall6(n: usize,
                        a6: usize)
                        -> usize {
     let ret: usize;
+    let syscall = n + MACOS_SYSCALL_PREFIX;
     llvm_asm!("syscall" : "={rax}"(ret)
-                   : "{rax}"(n), "{rdi}"(a1), "{rsi}"(a2), "{rdx}"(a3),
+                   : "{rax}"(syscall), "{rdi}"(a1), "{rsi}"(a2), "{rdx}"(a3),
                      "{r10}"(a4), "{r8}"(a5), "{r9}"(a6)
                    : "rcx", "r11", "memory"
                    : "volatile");