From 6146f81c6e5bb96f834a02dfd9cbadbe6e48e982 Mon Sep 17 00:00:00 2001
From: Koakuma <koachan@protonmail.com>
Date: Fri, 28 Aug 2020 21:42:26 +0700
Subject: [PATCH] Add pipe(2) support

---
 lib/std/os/linux.zig         |  2 +-
 lib/std/os/linux/sparc64.zig | 34 ++++++++++++++++++++++++++--------
 lib/std/target.zig           |  7 +++++++
 3 files changed, 34 insertions(+), 9 deletions(-)

diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index 0a675cf10f..af4f127228 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -381,7 +381,7 @@ pub fn faccessat(dirfd: i32, path: [*:0]const u8, mode: u32, flags: u32) usize {
 }
 
 pub fn pipe(fd: *[2]i32) usize {
-    if (comptime builtin.arch.isMIPS()) {
+    if (comptime builtin.arch.isMIPS() || comptime builtin.arch.isSPARC()) {
         return syscall_pipe(fd);
     } else if (@hasField(SYS, "pipe")) {
         return syscall1(.pipe, @ptrToInt(fd));
diff --git a/lib/std/os/linux/sparc64.zig b/lib/std/os/linux/sparc64.zig
index d3dd551a25..dc0b5845b1 100644
--- a/lib/std/os/linux/sparc64.zig
+++ b/lib/std/os/linux/sparc64.zig
@@ -1,5 +1,23 @@
 usingnamespace @import("../bits.zig");
 
+pub fn syscall_pipe(fd: *[2]i32) usize {
+    return asm volatile (
+        \\ mov %%o0, %%o2
+        \\ t 0x6d
+        \\ bcc %%xcc, 1f
+        \\ nop
+        \\ ba 2f
+        \\ neg %%o0
+        \\ 1:
+        \\ st %%o0, [%%o2]
+        \\ st %%o1, [%%o2 + 4]
+        \\ clr %%o0
+        \\ 2:
+        : [ret] "={o0}" (-> usize)
+        : [number] "{$2}" (@enumToInt(SYS.pipe))
+        : "memory", "xcc", "o1", "o2", "o3", "o4", "o5", "o7"
+    );
+}
 
 pub fn syscall0(number: SYS) usize {
     return asm volatile (
@@ -10,7 +28,7 @@ pub fn syscall0(number: SYS) usize {
         \\ 1:
         : [ret] "={o0}" (-> usize)
         : [number] "{g1}" (@enumToInt(number))
-        : "memory", "o1", "o2", "o3", "o4", "o5", "o7"
+        : "memory", "xcc", "o1", "o2", "o3", "o4", "o5", "o7"
     );
 }
 
@@ -24,7 +42,7 @@ pub fn syscall1(number: SYS, arg1: usize) usize {
         : [ret] "={o0}" (-> usize)
         : [number] "{g1}" (@enumToInt(number)),
           [arg1] "{o0}" (arg1)
-        : "memory", "o1", "o2", "o3", "o4", "o5", "o7"
+        : "memory", "xcc", "o1", "o2", "o3", "o4", "o5", "o7"
     );
 }
 
@@ -39,7 +57,7 @@ pub fn syscall2(number: SYS, arg1: usize, arg2: usize) usize {
         : [number] "{g1}" (@enumToInt(number)),
           [arg1] "{o0}" (arg1),
           [arg2] "{o1}" (arg2)
-        : "memory", "o1", "o2", "o3", "o4", "o5", "o7"
+        : "memory", "xcc", "o1", "o2", "o3", "o4", "o5", "o7"
     );
 }
 
@@ -55,7 +73,7 @@ pub fn syscall3(number: SYS, arg1: usize, arg2: usize, arg3: usize) usize {
           [arg1] "{o0}" (arg1),
           [arg2] "{o1}" (arg2),
           [arg3] "{o2}" (arg3)
-        : "memory", "o1", "o2", "o3", "o4", "o5", "o7"
+        : "memory", "xcc", "o1", "o2", "o3", "o4", "o5", "o7"
     );
 }
 
@@ -72,7 +90,7 @@ pub fn syscall4(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize)
           [arg2] "{o1}" (arg2),
           [arg3] "{o2}" (arg3),
           [arg4] "{o3}" (arg4)
-        : "memory", "o1", "o2", "o3", "o4", "o5", "o7"
+        : "memory", "xcc", "o1", "o2", "o3", "o4", "o5", "o7"
     );
 }
 
@@ -90,7 +108,7 @@ pub fn syscall5(number: SYS, arg1: usize, arg2: usize, arg3: usize, arg4: usize,
           [arg3] "{o2}" (arg3),
           [arg4] "{o3}" (arg4),
           [arg5] "{o4}" (arg5),
-        : "memory", "o1", "o2", "o3", "o4", "o5", "o7"
+        : "memory", "xcc", "o1", "o2", "o3", "o4", "o5", "o7"
     );
 }
 
@@ -117,7 +135,7 @@ pub fn syscall6(
           [arg4] "{o3}" (arg4),
           [arg5] "{o4}" (arg5),
           [arg6] "{o5}" (arg6),
-        : "memory", "o1", "o2", "o3", "o4", "o5", "o7"
+        : "memory", "xcc", "o1", "o2", "o3", "o4", "o5", "o7"
     );
 }
 
@@ -130,6 +148,6 @@ pub fn restore_rt() callconv(.Naked) void {
     return asm volatile ("t 0x6d"
         :
         : [number] "{g1}" (@enumToInt(SYS.rt_sigreturn))
-        : "memory", "o0", "o1", "o2", "o3", "o4", "o5", "o7"
+        : "memory", "xcc", "o0", "o1", "o2", "o3", "o4", "o5", "o7"
     );
 }
diff --git a/lib/std/target.zig b/lib/std/target.zig
index 7fbac8a4be..798a90bbdf 100644
--- a/lib/std/target.zig
+++ b/lib/std/target.zig
@@ -761,6 +761,13 @@ pub const Target = struct {
                 };
             }
 
+            pub fn isSPARC(arch: Arch) bool {
+                return switch (arch) {
+                    .sparcv8, .sparcv9 => true,
+                    else => false,
+                };
+            }
+
             pub fn parseCpuModel(arch: Arch, cpu_name: []const u8) !*const Cpu.Model {
                 for (arch.allCpuModels()) |cpu| {
                     if (mem.eql(u8, cpu_name, cpu.name)) {