diff options
Diffstat (limited to 'src/runtime/cgo/gcc_linux_ppc64x.S')
-rw-r--r-- | src/runtime/cgo/gcc_linux_ppc64x.S | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/runtime/cgo/gcc_linux_ppc64x.S b/src/runtime/cgo/gcc_linux_ppc64x.S new file mode 100644 index 0000000..745d232 --- /dev/null +++ b/src/runtime/cgo/gcc_linux_ppc64x.S @@ -0,0 +1,86 @@ +// 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 |