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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.
// +build ppc64 ppc64le
/*
* Apple still insists on underscore prefixes for C function names.
*/
#if defined(__APPLE__)
#define EXT(s) _##s
#else
#define EXT(s) s
#endif
/*
* 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 EXT(crosscall_ppc64)
EXT(crosscall_ppc64):
// Start with standard C stack frame layout and linkage
mflr %r0
std %r0, 16(%r1) // Save LR in caller's frame
std %r2, 24(%r1) // Save TOC in caller's frame
bl saveregs
stdu %r1, -296(%r1)
// Set up Go ABI constant registers
bl _cgo_reginit
nop
// 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
addi %r1, %r1, 296
bl restoreregs
ld %r2, 24(%r1)
ld %r0, 16(%r1)
mtlr %r0
blr
saveregs:
// Save callee-save registers
// O=-288; for R in %r{14..31}; do echo "\tstd\t$R, $O(%r1)"; ((O+=8)); done; for F in f{14..31}; do echo "\tstfd\t$F, $O(%r1)"; ((O+=8)); done
std %r14, -288(%r1)
std %r15, -280(%r1)
std %r16, -272(%r1)
std %r17, -264(%r1)
std %r18, -256(%r1)
std %r19, -248(%r1)
std %r20, -240(%r1)
std %r21, -232(%r1)
std %r22, -224(%r1)
std %r23, -216(%r1)
std %r24, -208(%r1)
std %r25, -200(%r1)
std %r26, -192(%r1)
std %r27, -184(%r1)
std %r28, -176(%r1)
std %r29, -168(%r1)
std %r30, -160(%r1)
std %r31, -152(%r1)
stfd %f14, -144(%r1)
stfd %f15, -136(%r1)
stfd %f16, -128(%r1)
stfd %f17, -120(%r1)
stfd %f18, -112(%r1)
stfd %f19, -104(%r1)
stfd %f20, -96(%r1)
stfd %f21, -88(%r1)
stfd %f22, -80(%r1)
stfd %f23, -72(%r1)
stfd %f24, -64(%r1)
stfd %f25, -56(%r1)
stfd %f26, -48(%r1)
stfd %f27, -40(%r1)
stfd %f28, -32(%r1)
stfd %f29, -24(%r1)
stfd %f30, -16(%r1)
stfd %f31, -8(%r1)
blr
restoreregs:
// O=-288; for R in %r{14..31}; do echo "\tld\t$R, $O(%r1)"; ((O+=8)); done; for F in %f{14..31}; do echo "\tlfd\t$F, $O(%r1)"; ((O+=8)); done
ld %r14, -288(%r1)
ld %r15, -280(%r1)
ld %r16, -272(%r1)
ld %r17, -264(%r1)
ld %r18, -256(%r1)
ld %r19, -248(%r1)
ld %r20, -240(%r1)
ld %r21, -232(%r1)
ld %r22, -224(%r1)
ld %r23, -216(%r1)
ld %r24, -208(%r1)
ld %r25, -200(%r1)
ld %r26, -192(%r1)
ld %r27, -184(%r1)
ld %r28, -176(%r1)
ld %r29, -168(%r1)
ld %r30, -160(%r1)
ld %r31, -152(%r1)
lfd %f14, -144(%r1)
lfd %f15, -136(%r1)
lfd %f16, -128(%r1)
lfd %f17, -120(%r1)
lfd %f18, -112(%r1)
lfd %f19, -104(%r1)
lfd %f20, -96(%r1)
lfd %f21, -88(%r1)
lfd %f22, -80(%r1)
lfd %f23, -72(%r1)
lfd %f24, -64(%r1)
lfd %f25, -56(%r1)
lfd %f26, -48(%r1)
lfd %f27, -40(%r1)
lfd %f28, -32(%r1)
lfd %f29, -24(%r1)
lfd %f30, -16(%r1)
lfd %f31, -8(%r1)
blr
#ifdef __ELF__
.section .note.GNU-stack,"",%progbits
#endif
|
