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#
# 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)
lda v0, 0
stl a4, 4(a0)
ret zero,(ra),1
.size pipe,.-pipe
.end pipe
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