// NOTE: gogo assumes load_g only clobers g (R30) and REGTMP (R23)
TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0-0
	MOVB	runtime·iscgo(SB), R23
	BEQ	R23, nocgo

	MOVW	R3, R23
	MOVW	g, runtime·tls_g(SB) // TLS relocation clobbers R3
	MOVW	R23, R3

nocgo:
	RET

TEXT runtime·load_g(SB),NOSPLIT|NOFRAME,$0-0
	MOVW	runtime·tls_g(SB), g // TLS relocation clobbers R3
	RET

//
// NOTE: mcall() assumes this clobbers only R23 (REGTMP).
TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0-0
	MOVB	runtime·iscgo(SB), R23
	BEQ	R23, nocgo

	MOVV	R3, R23	// save R3
	MOVV	g, runtime·tls_g(SB) // TLS relocation clobbers R3
	MOVV	R23, R3	// restore R3

nocgo:
	RET

TEXT runtime·load_g(SB),NOSPLIT|NOFRAME,$0-0
	MOVV	runtime·tls_g(SB), g // TLS relocation clobbers R3
	RET

// Package framepointer defines an Analyzer that reports assembly code
// that clobbers the frame pointer before saving it.
package framepointer

import (
	"go/build"
	"regexp"
	"strings"

	"golang.org/x/tools/go/analysis"
	"golang.org/x/tools/go/analysis/passes/internal/analysisutil"
)

const Doc = "report assembly that clobbers the frame pointer before saving it"

var Analyzer = &analysis.Analyzer{

// thread-local memory, so that we can call externally compiled
// ppc64 code that will overwrite this register.
//
// If !iscgo, this is a no-op.
//
// NOTE: setg_gcc<> assume this clobbers only R31.
TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0-0
#ifndef GOOS_aix
#ifndef GOOS_openbsd
	MOVBZ	runtime·iscgo(SB), R31
	CMP	R31, $0
	BEQ	nocgo
#endif
#endif
	MOVD	runtime·tls_g(SB), R31

// run

// Copyright 2019 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.

// Issue 30977: write barrier call clobbers volatile
// value when there are multiple uses of the value.

package main

import "runtime"

type T struct {
	a, b, c, d, e string
}

//go:noinline
func g() T {
	return T{"a", "b", "c", "d", "e"}
}

// thread-local memory, so that we can call externally compiled
// s390x code that will overwrite this register.
//
// If !iscgo, this is a no-op.
//
// NOTE: setg_gcc<> assume this clobbers only R10 and R11.
TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0-0
	MOVB	runtime·iscgo(SB),  R10
	CMPBEQ	R10, $0, nocgo
	MOVW	AR0, R11
	SLD	$32, R11
	MOVW	AR1, R11
	MOVD	runtime·tls_g(SB), R10
	MOVD	g, 0(R10)(R11*1)

					r := v.reg.inputs[p.val]
					fmt.Fprintf(w, "{%d,%d},%s\n", p.val, r, a.regMaskComment(r))
				}
				fmt.Fprintln(w, "},")
			}

			if v.reg.clobbers > 0 {
				fmt.Fprintf(w, "clobbers: %d,%s\n", v.reg.clobbers, a.regMaskComment(v.reg.clobbers))
			}

			// reg outputs
			s = s[:0]
			for i, r := range v.reg.outputs {
				s = append(s, intPair{countRegs(r), i})
			}
			if len(s) > 0 {

// thread-local memory, so that we can call externally compiled
// ARM code that will overwrite those registers.
// NOTE: runtime.gogo assumes that R1 is preserved by this function.
//       runtime.mcall assumes this function only clobbers R0 and R11.
// Returns with g in R0.
TEXT runtime·save_g(SB),NOSPLIT,$0
	// If the host does not support MRC the linker will replace it with
	// a call to runtime.read_tls_fallback which jumps to __kuser_get_tls.

		// function calls
		{name: "CALLstatic", argLength: 1, reg: regInfo{clobbers: callerSave}, aux: "CallOff", clobberFlags: true, call: true},                                               // call static function aux.(*obj.LSym).  arg0=mem, auxint=argsize, returns mem

// license that can be found in the LICENSE file.

#include "go_asm.h"
#include "go_tls.h"
#include "funcdata.h"
#include "textflag.h"

// If !iscgo, this is a no-op.
//
// NOTE: mcall() assumes this clobbers only X31 (REG_TMP).
TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0-0
#ifndef GOOS_openbsd
	MOVB	runtime·iscgo(SB), X31
	BEQZ	X31, nocgo
#endif
	MOV	g, runtime·tls_g(SB)
nocgo:
	RET