mirror of https://go.googlesource.com/go
59 lines
1.4 KiB
ArmAsm
59 lines
1.4 KiB
ArmAsm
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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.file "gcc_s390x.S"
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/*
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* void crosscall_s390x(void (*fn)(void), void *g)
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*
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* Calling into the go tool chain, where all registers are caller save.
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* Called from standard s390x C ABI, where r6-r13, r15, and f8-f15 are
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* callee-save, so they must be saved explicitly.
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*/
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.globl crosscall_s390x
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crosscall_s390x:
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/* save r6-r15 in the register save area of the calling function */
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stmg %r6, %r15, 48(%r15)
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/* allocate 64 bytes of stack space to save f8-f15 */
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lay %r15, -64(%r15)
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/* save callee-saved floating point registers */
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std %f8, 0(%r15)
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std %f9, 8(%r15)
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std %f10, 16(%r15)
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std %f11, 24(%r15)
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std %f12, 32(%r15)
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std %f13, 40(%r15)
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std %f14, 48(%r15)
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std %f15, 56(%r15)
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/* restore g pointer */
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lgr %r13, %r3
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/* call fn */
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basr %r14, %r2
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/* restore floating point registers */
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ld %f8, 0(%r15)
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ld %f9, 8(%r15)
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ld %f10, 16(%r15)
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ld %f11, 24(%r15)
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ld %f12, 32(%r15)
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ld %f13, 40(%r15)
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ld %f14, 48(%r15)
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ld %f15, 56(%r15)
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/* de-allocate stack frame */
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la %r15, 64(%r15)
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/* restore general purpose registers */
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lmg %r6, %r15, 48(%r15)
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br %r14 /* restored by lmg */
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#ifdef __ELF__
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.section .note.GNU-stack,"",%progbits
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#endif
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