blob: 022f82d93e170a8250c49b387ed4caa66be693aa [file] [log] [blame]
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
* void crosscall_s390x(void (*fn)(void), void *g)
* Calling into the go tool chain, where all registers are caller save.
* Called from standard s390x C ABI, where r6-r13, r15, and f0, f2, f4 and f6 are
* callee-save, so they must be saved explicitly.
.globl crosscall_s390x
* save r6-r15, f0, f2, f4 and f6 in the
* register save area of the calling function
stmg %r6, %r15, 48(%r15)
stdy %f0, 128(%r15)
stdy %f2, 136(%r15)
stdy %f4, 144(%r15)
stdy %f6, 152(%r15)
/* set r0 to 0 */
xgr %r0, %r0
/* restore g pointer */
lgr %r13, %r3
/* grow stack 8 bytes and call fn */
agfi %r15, -8
basr %r14, %r2
agfi %r15, 8
/* restore registers */
lmg %r6, %r15, 48(%r15)
ldy %f0, 128(%r15)
ldy %f2, 136(%r15)
ldy %f4, 144(%r15)
ldy %f6, 152(%r15)
br %r14 /* restored by lmg */
#ifdef __ELF__
.section .note.GNU-stack,"",%progbits