Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 55 insertions, 0 deletions

diff --git a/src/runtime/asm_ppc64x.h b/src/runtime/asm_ppc64x.h
new file mode 100644
index 0000000..65870fe
--- /dev/null
+++ b/src/runtime/asm_ppc64x.h
@@ -0,0 +1,55 @@
+// Copyright 2015 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.
+
+// FIXED_FRAME defines the size of the fixed part of a stack frame. A stack
+// frame looks like this:
+//
+// +---------------------+
+// | local variable area |
+// +---------------------+
+// | argument area       |
+// +---------------------+ <- R1+FIXED_FRAME
+// | fixed area          |
+// +---------------------+ <- R1
+//
+// So a function that sets up a stack frame at all uses as least FIXED_FRAME
+// bytes of stack. This mostly affects assembly that calls other functions
+// with arguments (the arguments should be stored at FIXED_FRAME+0(R1),
+// FIXED_FRAME+8(R1) etc) and some other low-level places.
+//
+// The reason for using a constant is to make supporting PIC easier (although
+// we only support PIC on ppc64le which has a minimum 32 bytes of stack frame,
+// and currently always use that much, PIC on ppc64 would need to use 48).
+
+#define FIXED_FRAME 32
+
+// aix/ppc64 uses XCOFF which uses function descriptors.
+// AIX cannot perform the TOC relocation in a text section.
+// Therefore, these descriptors must live in a data section.
+#ifdef GOOS_aix
+#ifdef GOARCH_ppc64
+#define GO_PPC64X_HAS_FUNCDESC
+#define DEFINE_PPC64X_FUNCDESC(funcname, localfuncname)	\
+	DATA	funcname+0(SB)/8, $localfuncname(SB) 	\
+	DATA	funcname+8(SB)/8, $TOC(SB)		\
+	DATA	funcname+16(SB)/8, $0			\
+	GLOBL	funcname(SB), NOPTR, $24
+#endif
+#endif
+
+// linux/ppc64 uses ELFv1 which uses function descriptors.
+// These must also look like ABI0 functions on linux/ppc64
+// to work with abi.FuncPCABI0(sigtramp) in os_linux.go.
+// Only static codegen is supported on linux/ppc64, so TOC
+// is not needed.
+#ifdef GOOS_linux
+#ifdef GOARCH_ppc64
+#define GO_PPC64X_HAS_FUNCDESC
+#define DEFINE_PPC64X_FUNCDESC(funcname, localfuncname)	\
+	TEXT	funcname(SB),NOSPLIT|NOFRAME,$0		\
+		DWORD	$localfuncname(SB)		\
+		DWORD	$0				\
+		DWORD	$0
+#endif
+#endif