[klibc] alpha: write pipe() system call in assembly
pipe() was written in C, but the implementation used macros from
the kernel which are no longer good. Just write the danged thing
all in assembly.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/usr/klibc/arch/alpha/pipe.S b/usr/klibc/arch/alpha/pipe.S
new file mode 100644
index 0000000..18244db
--- /dev/null
+++ b/usr/klibc/arch/alpha/pipe.S
@@ -0,0 +1,38 @@
+#
+# arch/alpha/pipe.S
+#
+
+#
+# pipe() on alpha returns both file descriptors in registers --
+# $0 (v0) and $20 (a4) respectively. This is unlike any other system call,
+# as far as I can tell.
+#
+
+#include <asm/unistd.h>
+#include <machine/asm.h>
+
+ .text
+ .align 3
+ .type pipe, @function
+ .ent pipe, 0
+ .globl pipe
+pipe:
+ .frame sp,0,ra,0
+ lda v0, __NR_pipe
+ callsys
+ beq a3, 1f
+ br pv, 2f # pv <- pc
+2:
+ ldgp gp, 0(pv)
+ lda a1, errno
+ lda v0, -1(zero)
+ stl a3, 0(a1)
+ ret zero,(ra),1
+1:
+ stl v0, 0(a0)
+ mov v0, zero
+ stl a3, 4(a0)
+ ret zero,(ra),1
+
+ .size __syscall_dual1,.-__syscall_dual1
+ .end __syscall_dual1
diff --git a/usr/klibc/arch/alpha/pipe.c b/usr/klibc/arch/alpha/pipe.c
deleted file mode 100644
index ca24360..0000000
--- a/usr/klibc/arch/alpha/pipe.c
+++ /dev/null
@@ -1,28 +0,0 @@
-#include <unistd.h>
-#include <sys/syscall.h>
-
-/* pipe() on alpha returns both file descriptors in registers --
- $0 and $20 respectively. This is unlike any other system call,
- as far as I can tell. */
-
-int pipe(int *fds)
-{
- register long sc_0 __asm__("$0");
- register long sc_19 __asm__("$19");
- register long sc_20 __asm__("$20");
-
- sc_0 = __NR_pipe;
- asm volatile ("callsys":"=r" (sc_0), "=r"(sc_19), "=r"(sc_20)
- :"0"(sc_0)
- :_syscall_clobbers);
-
- if (sc_19) {
- errno = sc_19;
- return -1;
- }
-
- fds[0] = sc_0;
- fds[1] = sc_20;
-
- return 0;
-}
