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// Copyright 2014 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.
//go:build linux && (ppc64 || ppc64le)
.file "gcc_linux_ppc64x.S"
// Define a frame which has no argument space, but is compatible with
// a call into a Go ABI. We allocate 32B to match FIXED_FRAME with
// similar semantics, except we store the backchain pointer, not the
// LR at offset 0. R2 is stored in the Go TOC save slot (offset 24).
.set GPR_OFFSET, 32
.set FPR_OFFSET, GPR_OFFSET + 18*8
.set VR_OFFSET, FPR_OFFSET + 18*8
.set FRAME_SIZE, VR_OFFSET + 12*16
.macro FOR_EACH_GPR opcode r=14
.ifge 31 - \r
\opcode \r, GPR_OFFSET + 8*(\r-14)(1)
FOR_EACH_GPR \opcode "(\r+1)"
.endif
.endm
.macro FOR_EACH_FPR opcode fr=14
.ifge 31 - \fr
\opcode \fr, FPR_OFFSET + 8*(\fr-14)(1)
FOR_EACH_FPR \opcode "(\fr+1)"
.endif
.endm
.macro FOR_EACH_VR opcode vr=20
.ifge 31 - \vr
li 0, VR_OFFSET + 16*(\vr-20)
\opcode \vr, 1, 0
FOR_EACH_VR \opcode "(\vr+1)"
.endif
.endm
/*
* void crosscall_ppc64(void (*fn)(void), void *g)
*
* Calling into the gc tool chain, where all registers are caller save.
* Called from standard ppc64 C ABI, where r2, r14-r31, f14-f31 are
* callee-save, so they must be saved explicitly.
*/
.globl crosscall_ppc64
crosscall_ppc64:
// Start with standard C stack frame layout and linkage
mflr %r0
std %r0, 16(%r1) // Save LR in caller's frame
mfcr %r0
std %r0, 8(%r1) // Save CR in caller's frame
stdu %r1, -FRAME_SIZE(%r1)
std %r2, 24(%r1)
FOR_EACH_GPR std
FOR_EACH_FPR stfd
FOR_EACH_VR stvx
// Set up Go ABI constant registers
li %r0, 0
// Restore g pointer (r30 in Go ABI, which may have been clobbered by C)
mr %r30, %r4
// Call fn
mr %r12, %r3
mtctr %r3
bctrl
FOR_EACH_GPR ld
FOR_EACH_FPR lfd
FOR_EACH_VR lvx
ld %r2, 24(%r1)
addi %r1, %r1, FRAME_SIZE
ld %r0, 16(%r1)
mtlr %r0
ld %r0, 8(%r1)
mtcr %r0
blr
#ifdef __ELF__
.section .note.GNU-stack,"",%progbits
#endif
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