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asm5.go
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// Inferno utils/5l/span.c
// https://bitbucket.org/inferno-os/inferno-os/src/master/utils/5l/span.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package arm
import (
"cmd/internal/obj"
"cmd/internal/objabi"
"fmt"
"internal/buildcfg"
"log"
"math"
"slices"
)
// ctxt5 holds state while assembling a single function.
// Each function gets a fresh ctxt5.
// This allows for multiple functions to be safely concurrently assembled.
type ctxt5 struct {
ctxt *obj.Link
newprog obj.ProgAlloc
cursym *obj.LSym
printp *obj.Prog
blitrl *obj.Prog
elitrl *obj.Prog
autosize int64
instoffset int64
pc int64
pool struct {
start uint32
size uint32
extra uint32
}
}
type Optab struct {
as obj.As
a1 uint8
a2 int8
a3 uint8
type_ uint8
size int8
param int16
flag int8
pcrelsiz uint8
scond uint8 // optional flags accepted by the instruction
}
type Opcross [32][2][32]uint8
const (
LFROM = 1 << 0
LTO = 1 << 1
LPOOL = 1 << 2
LPCREL = 1 << 3
)
var optab = []Optab{
/* struct Optab:
OPCODE, from, prog->reg, to, type, size, param, flag, extra data size, optional suffix */
{obj.ATEXT, C_ADDR, C_NONE, C_TEXTSIZE, 0, 0, 0, 0, 0, 0},
{AADD, C_REG, C_REG, C_REG, 1, 4, 0, 0, 0, C_SBIT},
{AADD, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0, C_SBIT},
{AAND, C_REG, C_REG, C_REG, 1, 4, 0, 0, 0, C_SBIT},
{AAND, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0, C_SBIT},
{AORR, C_REG, C_REG, C_REG, 1, 4, 0, 0, 0, C_SBIT},
{AORR, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0, C_SBIT},
{AMOVW, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0, C_SBIT},
{AMVN, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0, C_SBIT},
{ACMP, C_REG, C_REG, C_NONE, 1, 4, 0, 0, 0, 0},
{AADD, C_RCON, C_REG, C_REG, 2, 4, 0, 0, 0, C_SBIT},
{AADD, C_RCON, C_NONE, C_REG, 2, 4, 0, 0, 0, C_SBIT},
{AAND, C_RCON, C_REG, C_REG, 2, 4, 0, 0, 0, C_SBIT},
{AAND, C_RCON, C_NONE, C_REG, 2, 4, 0, 0, 0, C_SBIT},
{AORR, C_RCON, C_REG, C_REG, 2, 4, 0, 0, 0, C_SBIT},
{AORR, C_RCON, C_NONE, C_REG, 2, 4, 0, 0, 0, C_SBIT},
{AMOVW, C_RCON, C_NONE, C_REG, 2, 4, 0, 0, 0, 0},
{AMVN, C_RCON, C_NONE, C_REG, 2, 4, 0, 0, 0, 0},
{ACMP, C_RCON, C_REG, C_NONE, 2, 4, 0, 0, 0, 0},
{AADD, C_SHIFT, C_REG, C_REG, 3, 4, 0, 0, 0, C_SBIT},
{AADD, C_SHIFT, C_NONE, C_REG, 3, 4, 0, 0, 0, C_SBIT},
{AAND, C_SHIFT, C_REG, C_REG, 3, 4, 0, 0, 0, C_SBIT},
{AAND, C_SHIFT, C_NONE, C_REG, 3, 4, 0, 0, 0, C_SBIT},
{AORR, C_SHIFT, C_REG, C_REG, 3, 4, 0, 0, 0, C_SBIT},
{AORR, C_SHIFT, C_NONE, C_REG, 3, 4, 0, 0, 0, C_SBIT},
{AMVN, C_SHIFT, C_NONE, C_REG, 3, 4, 0, 0, 0, C_SBIT},
{ACMP, C_SHIFT, C_REG, C_NONE, 3, 4, 0, 0, 0, 0},
{AMOVW, C_RACON, C_NONE, C_REG, 4, 4, REGSP, 0, 0, C_SBIT},
{AB, C_NONE, C_NONE, C_SBRA, 5, 4, 0, LPOOL, 0, 0},
{ABL, C_NONE, C_NONE, C_SBRA, 5, 4, 0, 0, 0, 0},
{ABX, C_NONE, C_NONE, C_SBRA, 74, 20, 0, 0, 0, 0},
{ABEQ, C_NONE, C_NONE, C_SBRA, 5, 4, 0, 0, 0, 0},
{ABEQ, C_RCON, C_NONE, C_SBRA, 5, 4, 0, 0, 0, 0}, // prediction hinted form, hint ignored
{AB, C_NONE, C_NONE, C_ROREG, 6, 4, 0, LPOOL, 0, 0},
{ABL, C_NONE, C_NONE, C_ROREG, 7, 4, 0, 0, 0, 0},
{ABL, C_REG, C_NONE, C_ROREG, 7, 4, 0, 0, 0, 0},
{ABX, C_NONE, C_NONE, C_ROREG, 75, 12, 0, 0, 0, 0},
{ABXRET, C_NONE, C_NONE, C_ROREG, 76, 4, 0, 0, 0, 0},
{ASLL, C_RCON, C_REG, C_REG, 8, 4, 0, 0, 0, C_SBIT},
{ASLL, C_RCON, C_NONE, C_REG, 8, 4, 0, 0, 0, C_SBIT},
{ASLL, C_REG, C_NONE, C_REG, 9, 4, 0, 0, 0, C_SBIT},
{ASLL, C_REG, C_REG, C_REG, 9, 4, 0, 0, 0, C_SBIT},
{ASWI, C_NONE, C_NONE, C_NONE, 10, 4, 0, 0, 0, 0},
{ASWI, C_NONE, C_NONE, C_LCON, 10, 4, 0, 0, 0, 0},
{AWORD, C_NONE, C_NONE, C_LCON, 11, 4, 0, 0, 0, 0},
{AWORD, C_NONE, C_NONE, C_LCONADDR, 11, 4, 0, 0, 0, 0},
{AWORD, C_NONE, C_NONE, C_ADDR, 11, 4, 0, 0, 0, 0},
{AWORD, C_NONE, C_NONE, C_TLS_LE, 103, 4, 0, 0, 0, 0},
{AWORD, C_NONE, C_NONE, C_TLS_IE, 104, 4, 0, 0, 0, 0},
{AMOVW, C_NCON, C_NONE, C_REG, 12, 4, 0, 0, 0, 0},
{AMOVW, C_SCON, C_NONE, C_REG, 12, 4, 0, 0, 0, 0},
{AMOVW, C_LCON, C_NONE, C_REG, 12, 4, 0, LFROM, 0, 0},
{AMOVW, C_LCONADDR, C_NONE, C_REG, 12, 4, 0, LFROM | LPCREL, 4, 0},
{AMVN, C_NCON, C_NONE, C_REG, 12, 4, 0, 0, 0, 0},
{AADD, C_NCON, C_REG, C_REG, 13, 8, 0, 0, 0, C_SBIT},
{AADD, C_NCON, C_NONE, C_REG, 13, 8, 0, 0, 0, C_SBIT},
{AAND, C_NCON, C_REG, C_REG, 13, 8, 0, 0, 0, C_SBIT},
{AAND, C_NCON, C_NONE, C_REG, 13, 8, 0, 0, 0, C_SBIT},
{AORR, C_NCON, C_REG, C_REG, 13, 8, 0, 0, 0, C_SBIT},
{AORR, C_NCON, C_NONE, C_REG, 13, 8, 0, 0, 0, C_SBIT},
{ACMP, C_NCON, C_REG, C_NONE, 13, 8, 0, 0, 0, 0},
{AADD, C_SCON, C_REG, C_REG, 13, 8, 0, 0, 0, C_SBIT},
{AADD, C_SCON, C_NONE, C_REG, 13, 8, 0, 0, 0, C_SBIT},
{AAND, C_SCON, C_REG, C_REG, 13, 8, 0, 0, 0, C_SBIT},
{AAND, C_SCON, C_NONE, C_REG, 13, 8, 0, 0, 0, C_SBIT},
{AORR, C_SCON, C_REG, C_REG, 13, 8, 0, 0, 0, C_SBIT},
{AORR, C_SCON, C_NONE, C_REG, 13, 8, 0, 0, 0, C_SBIT},
{AMVN, C_SCON, C_NONE, C_REG, 13, 8, 0, 0, 0, 0},
{ACMP, C_SCON, C_REG, C_NONE, 13, 8, 0, 0, 0, 0},
{AADD, C_RCON2A, C_REG, C_REG, 106, 8, 0, 0, 0, 0},
{AADD, C_RCON2A, C_NONE, C_REG, 106, 8, 0, 0, 0, 0},
{AORR, C_RCON2A, C_REG, C_REG, 106, 8, 0, 0, 0, 0},
{AORR, C_RCON2A, C_NONE, C_REG, 106, 8, 0, 0, 0, 0},
{AADD, C_RCON2S, C_REG, C_REG, 107, 8, 0, 0, 0, 0},
{AADD, C_RCON2S, C_NONE, C_REG, 107, 8, 0, 0, 0, 0},
{AADD, C_LCON, C_REG, C_REG, 13, 8, 0, LFROM, 0, C_SBIT},
{AADD, C_LCON, C_NONE, C_REG, 13, 8, 0, LFROM, 0, C_SBIT},
{AAND, C_LCON, C_REG, C_REG, 13, 8, 0, LFROM, 0, C_SBIT},
{AAND, C_LCON, C_NONE, C_REG, 13, 8, 0, LFROM, 0, C_SBIT},
{AORR, C_LCON, C_REG, C_REG, 13, 8, 0, LFROM, 0, C_SBIT},
{AORR, C_LCON, C_NONE, C_REG, 13, 8, 0, LFROM, 0, C_SBIT},
{AMVN, C_LCON, C_NONE, C_REG, 13, 8, 0, LFROM, 0, 0},
{ACMP, C_LCON, C_REG, C_NONE, 13, 8, 0, LFROM, 0, 0},
{AMOVB, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0, 0},
{AMOVBS, C_REG, C_NONE, C_REG, 14, 8, 0, 0, 0, 0},
{AMOVBU, C_REG, C_NONE, C_REG, 58, 4, 0, 0, 0, 0},
{AMOVH, C_REG, C_NONE, C_REG, 1, 4, 0, 0, 0, 0},
{AMOVHS, C_REG, C_NONE, C_REG, 14, 8, 0, 0, 0, 0},
{AMOVHU, C_REG, C_NONE, C_REG, 14, 8, 0, 0, 0, 0},
{AMUL, C_REG, C_REG, C_REG, 15, 4, 0, 0, 0, C_SBIT},
{AMUL, C_REG, C_NONE, C_REG, 15, 4, 0, 0, 0, C_SBIT},
{ADIV, C_REG, C_REG, C_REG, 16, 4, 0, 0, 0, 0},
{ADIV, C_REG, C_NONE, C_REG, 16, 4, 0, 0, 0, 0},
{ADIVHW, C_REG, C_REG, C_REG, 105, 4, 0, 0, 0, 0},
{ADIVHW, C_REG, C_NONE, C_REG, 105, 4, 0, 0, 0, 0},
{AMULL, C_REG, C_REG, C_REGREG, 17, 4, 0, 0, 0, C_SBIT},
{ABFX, C_LCON, C_REG, C_REG, 18, 4, 0, 0, 0, 0}, // width in From, LSB in From3
{ABFX, C_LCON, C_NONE, C_REG, 18, 4, 0, 0, 0, 0}, // width in From, LSB in From3
{AMOVW, C_REG, C_NONE, C_SAUTO, 20, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVW, C_REG, C_NONE, C_SOREG, 20, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVB, C_REG, C_NONE, C_SAUTO, 20, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVB, C_REG, C_NONE, C_SOREG, 20, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBS, C_REG, C_NONE, C_SAUTO, 20, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBS, C_REG, C_NONE, C_SOREG, 20, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBU, C_REG, C_NONE, C_SAUTO, 20, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBU, C_REG, C_NONE, C_SOREG, 20, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVW, C_SAUTO, C_NONE, C_REG, 21, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVW, C_SOREG, C_NONE, C_REG, 21, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBU, C_SAUTO, C_NONE, C_REG, 21, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBU, C_SOREG, C_NONE, C_REG, 21, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AXTAB, C_SHIFT, C_REG, C_REG, 22, 4, 0, 0, 0, 0},
{AXTAB, C_SHIFT, C_NONE, C_REG, 22, 4, 0, 0, 0, 0},
{AMOVW, C_SHIFT, C_NONE, C_REG, 23, 4, 0, 0, 0, C_SBIT},
{AMOVB, C_SHIFT, C_NONE, C_REG, 23, 4, 0, 0, 0, 0},
{AMOVBS, C_SHIFT, C_NONE, C_REG, 23, 4, 0, 0, 0, 0},
{AMOVBU, C_SHIFT, C_NONE, C_REG, 23, 4, 0, 0, 0, 0},
{AMOVH, C_SHIFT, C_NONE, C_REG, 23, 4, 0, 0, 0, 0},
{AMOVHS, C_SHIFT, C_NONE, C_REG, 23, 4, 0, 0, 0, 0},
{AMOVHU, C_SHIFT, C_NONE, C_REG, 23, 4, 0, 0, 0, 0},
{AMOVW, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVW, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVW, C_REG, C_NONE, C_ADDR, 64, 8, 0, LTO | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVB, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVB, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVB, C_REG, C_NONE, C_ADDR, 64, 8, 0, LTO | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVBS, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBS, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBS, C_REG, C_NONE, C_ADDR, 64, 8, 0, LTO | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVBU, C_REG, C_NONE, C_LAUTO, 30, 8, REGSP, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBU, C_REG, C_NONE, C_LOREG, 30, 8, 0, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBU, C_REG, C_NONE, C_ADDR, 64, 8, 0, LTO | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVW, C_TLS_LE, C_NONE, C_REG, 101, 4, 0, LFROM, 0, 0},
{AMOVW, C_TLS_IE, C_NONE, C_REG, 102, 8, 0, LFROM, 0, 0},
{AMOVW, C_LAUTO, C_NONE, C_REG, 31, 8, REGSP, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVW, C_LOREG, C_NONE, C_REG, 31, 8, 0, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVW, C_ADDR, C_NONE, C_REG, 65, 8, 0, LFROM | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVBU, C_LAUTO, C_NONE, C_REG, 31, 8, REGSP, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBU, C_LOREG, C_NONE, C_REG, 31, 8, 0, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBU, C_ADDR, C_NONE, C_REG, 65, 8, 0, LFROM | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVW, C_LACON, C_NONE, C_REG, 34, 8, REGSP, LFROM, 0, C_SBIT},
{AMOVW, C_PSR, C_NONE, C_REG, 35, 4, 0, 0, 0, 0},
{AMOVW, C_REG, C_NONE, C_PSR, 36, 4, 0, 0, 0, 0},
{AMOVW, C_RCON, C_NONE, C_PSR, 37, 4, 0, 0, 0, 0},
{AMOVM, C_REGLIST, C_NONE, C_SOREG, 38, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVM, C_SOREG, C_NONE, C_REGLIST, 39, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{ASWPW, C_SOREG, C_REG, C_REG, 40, 4, 0, 0, 0, 0},
{ARFE, C_NONE, C_NONE, C_NONE, 41, 4, 0, 0, 0, 0},
{AMOVF, C_FREG, C_NONE, C_FAUTO, 50, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVF, C_FREG, C_NONE, C_FOREG, 50, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVF, C_FAUTO, C_NONE, C_FREG, 51, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVF, C_FOREG, C_NONE, C_FREG, 51, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVF, C_FREG, C_NONE, C_LAUTO, 52, 12, REGSP, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVF, C_FREG, C_NONE, C_LOREG, 52, 12, 0, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVF, C_LAUTO, C_NONE, C_FREG, 53, 12, REGSP, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVF, C_LOREG, C_NONE, C_FREG, 53, 12, 0, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVF, C_FREG, C_NONE, C_ADDR, 68, 8, 0, LTO | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVF, C_ADDR, C_NONE, C_FREG, 69, 8, 0, LFROM | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AADDF, C_FREG, C_NONE, C_FREG, 54, 4, 0, 0, 0, 0},
{AADDF, C_FREG, C_FREG, C_FREG, 54, 4, 0, 0, 0, 0},
{AMOVF, C_FREG, C_NONE, C_FREG, 55, 4, 0, 0, 0, 0},
{ANEGF, C_FREG, C_NONE, C_FREG, 55, 4, 0, 0, 0, 0},
{AMOVW, C_REG, C_NONE, C_FCR, 56, 4, 0, 0, 0, 0},
{AMOVW, C_FCR, C_NONE, C_REG, 57, 4, 0, 0, 0, 0},
{AMOVW, C_SHIFTADDR, C_NONE, C_REG, 59, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBU, C_SHIFTADDR, C_NONE, C_REG, 59, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVB, C_SHIFTADDR, C_NONE, C_REG, 60, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBS, C_SHIFTADDR, C_NONE, C_REG, 60, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVH, C_SHIFTADDR, C_NONE, C_REG, 60, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHS, C_SHIFTADDR, C_NONE, C_REG, 60, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHU, C_SHIFTADDR, C_NONE, C_REG, 60, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVW, C_REG, C_NONE, C_SHIFTADDR, 61, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVB, C_REG, C_NONE, C_SHIFTADDR, 61, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBS, C_REG, C_NONE, C_SHIFTADDR, 61, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBU, C_REG, C_NONE, C_SHIFTADDR, 61, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVH, C_REG, C_NONE, C_SHIFTADDR, 62, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHS, C_REG, C_NONE, C_SHIFTADDR, 62, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHU, C_REG, C_NONE, C_SHIFTADDR, 62, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVH, C_REG, C_NONE, C_HAUTO, 70, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVH, C_REG, C_NONE, C_HOREG, 70, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHS, C_REG, C_NONE, C_HAUTO, 70, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHS, C_REG, C_NONE, C_HOREG, 70, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHU, C_REG, C_NONE, C_HAUTO, 70, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHU, C_REG, C_NONE, C_HOREG, 70, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVB, C_HAUTO, C_NONE, C_REG, 71, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVB, C_HOREG, C_NONE, C_REG, 71, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBS, C_HAUTO, C_NONE, C_REG, 71, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBS, C_HOREG, C_NONE, C_REG, 71, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVH, C_HAUTO, C_NONE, C_REG, 71, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVH, C_HOREG, C_NONE, C_REG, 71, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHS, C_HAUTO, C_NONE, C_REG, 71, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHS, C_HOREG, C_NONE, C_REG, 71, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHU, C_HAUTO, C_NONE, C_REG, 71, 4, REGSP, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHU, C_HOREG, C_NONE, C_REG, 71, 4, 0, 0, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVH, C_REG, C_NONE, C_LAUTO, 72, 8, REGSP, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVH, C_REG, C_NONE, C_LOREG, 72, 8, 0, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVH, C_REG, C_NONE, C_ADDR, 94, 8, 0, LTO | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVHS, C_REG, C_NONE, C_LAUTO, 72, 8, REGSP, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHS, C_REG, C_NONE, C_LOREG, 72, 8, 0, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHS, C_REG, C_NONE, C_ADDR, 94, 8, 0, LTO | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVHU, C_REG, C_NONE, C_LAUTO, 72, 8, REGSP, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHU, C_REG, C_NONE, C_LOREG, 72, 8, 0, LTO, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHU, C_REG, C_NONE, C_ADDR, 94, 8, 0, LTO | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVB, C_LAUTO, C_NONE, C_REG, 73, 8, REGSP, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVB, C_LOREG, C_NONE, C_REG, 73, 8, 0, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVB, C_ADDR, C_NONE, C_REG, 93, 8, 0, LFROM | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVBS, C_LAUTO, C_NONE, C_REG, 73, 8, REGSP, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBS, C_LOREG, C_NONE, C_REG, 73, 8, 0, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVBS, C_ADDR, C_NONE, C_REG, 93, 8, 0, LFROM | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVH, C_LAUTO, C_NONE, C_REG, 73, 8, REGSP, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVH, C_LOREG, C_NONE, C_REG, 73, 8, 0, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVH, C_ADDR, C_NONE, C_REG, 93, 8, 0, LFROM | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVHS, C_LAUTO, C_NONE, C_REG, 73, 8, REGSP, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHS, C_LOREG, C_NONE, C_REG, 73, 8, 0, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHS, C_ADDR, C_NONE, C_REG, 93, 8, 0, LFROM | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{AMOVHU, C_LAUTO, C_NONE, C_REG, 73, 8, REGSP, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHU, C_LOREG, C_NONE, C_REG, 73, 8, 0, LFROM, 0, C_PBIT | C_WBIT | C_UBIT},
{AMOVHU, C_ADDR, C_NONE, C_REG, 93, 8, 0, LFROM | LPCREL, 4, C_PBIT | C_WBIT | C_UBIT},
{ALDREX, C_SOREG, C_NONE, C_REG, 77, 4, 0, 0, 0, 0},
{ASTREX, C_SOREG, C_REG, C_REG, 78, 4, 0, 0, 0, 0},
{ADMB, C_NONE, C_NONE, C_NONE, 110, 4, 0, 0, 0, 0},
{ADMB, C_LCON, C_NONE, C_NONE, 110, 4, 0, 0, 0, 0},
{ADMB, C_SPR, C_NONE, C_NONE, 110, 4, 0, 0, 0, 0},
{AMOVF, C_ZFCON, C_NONE, C_FREG, 80, 8, 0, 0, 0, 0},
{AMOVF, C_SFCON, C_NONE, C_FREG, 81, 4, 0, 0, 0, 0},
{ACMPF, C_FREG, C_FREG, C_NONE, 82, 8, 0, 0, 0, 0},
{ACMPF, C_FREG, C_NONE, C_NONE, 83, 8, 0, 0, 0, 0},
{AMOVFW, C_FREG, C_NONE, C_FREG, 84, 4, 0, 0, 0, C_UBIT},
{AMOVWF, C_FREG, C_NONE, C_FREG, 85, 4, 0, 0, 0, C_UBIT},
{AMOVFW, C_FREG, C_NONE, C_REG, 86, 8, 0, 0, 0, C_UBIT},
{AMOVWF, C_REG, C_NONE, C_FREG, 87, 8, 0, 0, 0, C_UBIT},
{AMOVW, C_REG, C_NONE, C_FREG, 88, 4, 0, 0, 0, 0},
{AMOVW, C_FREG, C_NONE, C_REG, 89, 4, 0, 0, 0, 0},
{ALDREXD, C_SOREG, C_NONE, C_REG, 91, 4, 0, 0, 0, 0},
{ALDREXB, C_SOREG, C_NONE, C_REG, 91, 4, 0, 0, 0, 0},
{ASTREXD, C_SOREG, C_REG, C_REG, 92, 4, 0, 0, 0, 0},
{ASTREXB, C_SOREG, C_REG, C_REG, 92, 4, 0, 0, 0, 0},
{APLD, C_SOREG, C_NONE, C_NONE, 95, 4, 0, 0, 0, 0},
{obj.AUNDEF, C_NONE, C_NONE, C_NONE, 96, 4, 0, 0, 0, 0},
{ACLZ, C_REG, C_NONE, C_REG, 97, 4, 0, 0, 0, 0},
{AMULWT, C_REG, C_REG, C_REG, 98, 4, 0, 0, 0, 0},
{AMULA, C_REG, C_REG, C_REGREG2, 99, 4, 0, 0, 0, C_SBIT},
{AMULAWT, C_REG, C_REG, C_REGREG2, 99, 4, 0, 0, 0, 0},
{obj.APCDATA, C_LCON, C_NONE, C_LCON, 0, 0, 0, 0, 0, 0},
{obj.AFUNCDATA, C_LCON, C_NONE, C_ADDR, 0, 0, 0, 0, 0, 0},
{obj.ANOP, C_NONE, C_NONE, C_NONE, 0, 0, 0, 0, 0, 0},
{obj.ANOP, C_LCON, C_NONE, C_NONE, 0, 0, 0, 0, 0, 0}, // nop variants, see #40689
{obj.ANOP, C_REG, C_NONE, C_NONE, 0, 0, 0, 0, 0, 0},
{obj.ANOP, C_FREG, C_NONE, C_NONE, 0, 0, 0, 0, 0, 0},
{obj.ADUFFZERO, C_NONE, C_NONE, C_SBRA, 5, 4, 0, 0, 0, 0}, // same as ABL
{obj.ADUFFCOPY, C_NONE, C_NONE, C_SBRA, 5, 4, 0, 0, 0, 0}, // same as ABL
{obj.AXXX, C_NONE, C_NONE, C_NONE, 0, 4, 0, 0, 0, 0},
}
var mbOp = []struct {
reg int16
enc uint32
}{
{REG_MB_SY, 15},
{REG_MB_ST, 14},
{REG_MB_ISH, 11},
{REG_MB_ISHST, 10},
{REG_MB_NSH, 7},
{REG_MB_NSHST, 6},
{REG_MB_OSH, 3},
{REG_MB_OSHST, 2},
}
var oprange [ALAST & obj.AMask][]Optab
var xcmp [C_GOK + 1][C_GOK + 1]bool
var (
symdiv *obj.LSym
symdivu *obj.LSym
symmod *obj.LSym
symmodu *obj.LSym
)
// Note about encoding: Prog.scond holds the condition encoding,
// but XOR'ed with C_SCOND_XOR, so that C_SCOND_NONE == 0.
// The code that shifts the value << 28 has the responsibility
// for XORing with C_SCOND_XOR too.
func checkSuffix(c *ctxt5, p *obj.Prog, o *Optab) {
if p.Scond&C_SBIT != 0 && o.scond&C_SBIT == 0 {
c.ctxt.Diag("invalid .S suffix: %v", p)
}
if p.Scond&C_PBIT != 0 && o.scond&C_PBIT == 0 {
c.ctxt.Diag("invalid .P suffix: %v", p)
}
if p.Scond&C_WBIT != 0 && o.scond&C_WBIT == 0 {
c.ctxt.Diag("invalid .W suffix: %v", p)
}
if p.Scond&C_UBIT != 0 && o.scond&C_UBIT == 0 {
c.ctxt.Diag("invalid .U suffix: %v", p)
}
}
func span5(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
if ctxt.Retpoline {
ctxt.Diag("-spectre=ret not supported on arm")
ctxt.Retpoline = false // don't keep printing
}
var p *obj.Prog
var op *obj.Prog
p = cursym.Func().Text
if p == nil || p.Link == nil { // handle external functions and ELF section symbols
return
}
if oprange[AAND&obj.AMask] == nil {
ctxt.Diag("arm ops not initialized, call arm.buildop first")
}
c := ctxt5{ctxt: ctxt, newprog: newprog, cursym: cursym, autosize: p.To.Offset + 4}
pc := int32(0)
op = p
p = p.Link
var m int
var o *Optab
for ; p != nil || c.blitrl != nil; op, p = p, p.Link {
if p == nil {
if c.checkpool(op, pc) {
p = op
continue
}
// can't happen: blitrl is not nil, but checkpool didn't flushpool
ctxt.Diag("internal inconsistency")
break
}
p.Pc = int64(pc)
o = c.oplook(p)
m = int(o.size)
if m%4 != 0 || p.Pc%4 != 0 {
ctxt.Diag("!pc invalid: %v size=%d", p, m)
}
// must check literal pool here in case p generates many instructions
if c.blitrl != nil {
// Emit the constant pool just before p if p
// would push us over the immediate size limit.
if c.checkpool(op, pc+int32(m)) {
// Back up to the instruction just
// before the pool and continue with
// the first instruction of the pool.
p = op
continue
}
}
if m == 0 && (p.As != obj.AFUNCDATA && p.As != obj.APCDATA && p.As != obj.ANOP) {
ctxt.Diag("zero-width instruction\n%v", p)
continue
}
switch o.flag & (LFROM | LTO | LPOOL) {
case LFROM:
c.addpool(p, &p.From)
case LTO:
c.addpool(p, &p.To)
case LPOOL:
if p.Scond&C_SCOND == C_SCOND_NONE {
c.flushpool(p, 0, 0)
}
}
if p.As == AMOVW && p.To.Type == obj.TYPE_REG && p.To.Reg == REGPC && p.Scond&C_SCOND == C_SCOND_NONE {
c.flushpool(p, 0, 0)
}
pc += int32(m)
}
c.cursym.Size = int64(pc)
/*
* if any procedure is large enough to
* generate a large SBRA branch, then
* generate extra passes putting branches
* around jmps to fix. this is rare.
*/
times := 0
var bflag int
var opc int32
var out [6 + 3]uint32
for {
bflag = 0
pc = 0
times++
c.cursym.Func().Text.Pc = 0 // force re-layout the code.
for p = c.cursym.Func().Text; p != nil; p = p.Link {
o = c.oplook(p)
if int64(pc) > p.Pc {
p.Pc = int64(pc)
}
/* very large branches
if(o->type == 6 && p->pcond) {
otxt = p->pcond->pc - c;
if(otxt < 0)
otxt = -otxt;
if(otxt >= (1L<<17) - 10) {
q = emallocz(sizeof(Prog));
q->link = p->link;
p->link = q;
q->as = AB;
q->to.type = TYPE_BRANCH;
q->pcond = p->pcond;
p->pcond = q;
q = emallocz(sizeof(Prog));
q->link = p->link;
p->link = q;
q->as = AB;
q->to.type = TYPE_BRANCH;
q->pcond = q->link->link;
bflag = 1;
}
}
*/
opc = int32(p.Pc)
m = int(o.size)
if p.Pc != int64(opc) {
bflag = 1
}
//print("%v pc changed %d to %d in iter. %d\n", p, opc, (int32)p->pc, times);
pc = int32(p.Pc + int64(m))
if m%4 != 0 || p.Pc%4 != 0 {
ctxt.Diag("pc invalid: %v size=%d", p, m)
}
if m/4 > len(out) {
ctxt.Diag("instruction size too large: %d > %d", m/4, len(out))
}
if m == 0 && (p.As != obj.AFUNCDATA && p.As != obj.APCDATA && p.As != obj.ANOP) {
if p.As == obj.ATEXT {
c.autosize = p.To.Offset + 4
continue
}
ctxt.Diag("zero-width instruction\n%v", p)
continue
}
}
c.cursym.Size = int64(pc)
if bflag == 0 {
break
}
}
if pc%4 != 0 {
ctxt.Diag("sym->size=%d, invalid", pc)
}
/*
* lay out the code. all the pc-relative code references,
* even cross-function, are resolved now;
* only data references need to be relocated.
* with more work we could leave cross-function
* code references to be relocated too, and then
* perhaps we'd be able to parallelize the span loop above.
*/
p = c.cursym.Func().Text
c.autosize = p.To.Offset + 4
c.cursym.Grow(c.cursym.Size)
bp := c.cursym.P
pc = int32(p.Pc) // even p->link might need extra padding
var v int
for p = p.Link; p != nil; p = p.Link {
c.pc = p.Pc
o = c.oplook(p)
opc = int32(p.Pc)
c.asmout(p, o, out[:])
m = int(o.size)
if m%4 != 0 || p.Pc%4 != 0 {
ctxt.Diag("final stage: pc invalid: %v size=%d", p, m)
}
if int64(pc) > p.Pc {
ctxt.Diag("PC padding invalid: want %#d, has %#d: %v", p.Pc, pc, p)
}
for int64(pc) != p.Pc {
// emit 0xe1a00000 (MOVW R0, R0)
bp[0] = 0x00
bp = bp[1:]
bp[0] = 0x00
bp = bp[1:]
bp[0] = 0xa0
bp = bp[1:]
bp[0] = 0xe1
bp = bp[1:]
pc += 4
}
for i := 0; i < m/4; i++ {
v = int(out[i])
bp[0] = byte(v)
bp = bp[1:]
bp[0] = byte(v >> 8)
bp = bp[1:]
bp[0] = byte(v >> 16)
bp = bp[1:]
bp[0] = byte(v >> 24)
bp = bp[1:]
}
pc += int32(m)
}
}
// checkpool flushes the literal pool when the first reference to
// it threatens to go out of range of a 12-bit PC-relative offset.
//
// nextpc is the tentative next PC at which the pool could be emitted.
// checkpool should be called *before* emitting the instruction that
// would cause the PC to reach nextpc.
// If nextpc is too far from the first pool reference, checkpool will
// flush the pool immediately after p.
// The caller should resume processing a p.Link.
func (c *ctxt5) checkpool(p *obj.Prog, nextpc int32) bool {
poolLast := nextpc
poolLast += 4 // the AB instruction to jump around the pool
poolLast += int32(c.pool.size) - 4 // the offset of the last pool entry
refPC := int32(c.pool.start) // PC of the first pool reference
v := poolLast - refPC - 8 // 12-bit PC-relative offset (see omvl)
if c.pool.size >= 0xff0 || immaddr(v) == 0 {
return c.flushpool(p, 1, 0)
} else if p.Link == nil {
return c.flushpool(p, 2, 0)
}
return false
}
func (c *ctxt5) flushpool(p *obj.Prog, skip int, force int) bool {
if c.blitrl != nil {
if skip != 0 {
if false && skip == 1 {
fmt.Printf("note: flush literal pool at %x: len=%d ref=%x\n", uint64(p.Pc+4), c.pool.size, c.pool.start)
}
q := c.newprog()
q.As = AB
q.To.Type = obj.TYPE_BRANCH
q.To.SetTarget(p.Link)
q.Link = c.blitrl
q.Pos = p.Pos
c.blitrl = q
} else if force == 0 && (p.Pc+int64(c.pool.size)-int64(c.pool.start) < 2048) {
return false
}
// The line number for constant pool entries doesn't really matter.
// We set it to the line number of the preceding instruction so that
// there are no deltas to encode in the pc-line tables.
for q := c.blitrl; q != nil; q = q.Link {
q.Pos = p.Pos
}
c.elitrl.Link = p.Link
p.Link = c.blitrl
c.blitrl = nil /* BUG: should refer back to values until out-of-range */
c.elitrl = nil
c.pool.size = 0
c.pool.start = 0
c.pool.extra = 0
return true
}
return false
}
func (c *ctxt5) addpool(p *obj.Prog, a *obj.Addr) {
t := c.newprog()
t.As = AWORD
switch c.aclass(a) {
default:
t.To.Offset = a.Offset
t.To.Sym = a.Sym
t.To.Type = a.Type
t.To.Name = a.Name
if c.ctxt.Flag_shared && t.To.Sym != nil {
t.Rel = p
}
case C_HOREG,
C_FOREG,
C_HFOREG,
C_SOREG,
C_ROREG,
C_SROREG,
C_LOREG,
C_HAUTO,
C_FAUTO,
C_HFAUTO,
C_SAUTO,
C_LAUTO,
C_LACON:
t.To.Type = obj.TYPE_CONST
t.To.Offset = c.instoffset
}
if t.Rel == nil {
for q := c.blitrl; q != nil; q = q.Link { /* could hash on t.t0.offset */
if q.Rel == nil && q.To == t.To {
p.Pool = q
return
}
}
}
q := c.newprog()
*q = *t
q.Pc = int64(c.pool.size)
if c.blitrl == nil {
c.blitrl = q
c.pool.start = uint32(p.Pc)
} else {
c.elitrl.Link = q
}
c.elitrl = q
c.pool.size += 4
// Store the link to the pool entry in Pool.
p.Pool = q
}
func (c *ctxt5) regoff(a *obj.Addr) int32 {
c.instoffset = 0
c.aclass(a)
return int32(c.instoffset)
}
func immrot(v uint32) int32 {
for i := 0; i < 16; i++ {
if v&^0xff == 0 {
return int32(uint32(int32(i)<<8) | v | 1<<25)
}
v = v<<2 | v>>30
}
return 0
}
// immrot2a returns bits encoding the immediate constant fields of two instructions,
// such that the encoded constants x, y satisfy x|y==v, x&y==0.
// Returns 0,0 if no such decomposition of v exists.
func immrot2a(v uint32) (uint32, uint32) {
for i := uint(1); i < 32; i++ {
m := uint32(1<<i - 1)
if x, y := immrot(v&m), immrot(v&^m); x != 0 && y != 0 {
return uint32(x), uint32(y)
}
}
// TODO: handle some more cases, like where
// the wraparound from the rotate could help.
return 0, 0
}
// immrot2s returns bits encoding the immediate constant fields of two instructions,
// such that the encoded constants y, x satisfy y-x==v, y&x==0.
// Returns 0,0 if no such decomposition of v exists.
func immrot2s(v uint32) (uint32, uint32) {
if immrot(v) != 0 {
return v, 0
}
// suppose v in the form of {leading 00, upper effective bits, lower 8 effective bits, trailing 00}
// omit trailing 00
var i uint32
for i = 2; i < 32; i += 2 {
if v&(1<<i-1) != 0 {
break
}
}
// i must be <= 24, then adjust i just above lower 8 effective bits of v
i += 6
// let x = {the complement of lower 8 effective bits, trailing 00}, y = x + v
x := 1<<i - v&(1<<i-1)
y := v + x
if y, x = uint32(immrot(y)), uint32(immrot(x)); y != 0 && x != 0 {
return y, x
}
return 0, 0
}
func immaddr(v int32) int32 {
if v >= 0 && v <= 0xfff {
return v&0xfff | 1<<24 | 1<<23 /* pre indexing */ /* pre indexing, up */
}
if v >= -0xfff && v < 0 {
return -v&0xfff | 1<<24 /* pre indexing */
}
return 0
}
func immfloat(v int32) bool {
return v&0xC03 == 0 /* offset will fit in floating-point load/store */
}
func immhalf(v int32) bool {
if v >= 0 && v <= 0xff {
return v|1<<24|1<<23 != 0 /* pre indexing */ /* pre indexing, up */
}
if v >= -0xff && v < 0 {
return -v&0xff|1<<24 != 0 /* pre indexing */
}
return false
}
func (c *ctxt5) aclass(a *obj.Addr) int {
switch a.Type {
case obj.TYPE_NONE:
return C_NONE
case obj.TYPE_REG:
c.instoffset = 0
if REG_R0 <= a.Reg && a.Reg <= REG_R15 {
return C_REG
}
if REG_F0 <= a.Reg && a.Reg <= REG_F15 {
return C_FREG
}
if a.Reg == REG_FPSR || a.Reg == REG_FPCR {
return C_FCR
}
if a.Reg == REG_CPSR || a.Reg == REG_SPSR {
return C_PSR
}
if a.Reg >= REG_SPECIAL {
return C_SPR
}
return C_GOK
case obj.TYPE_REGREG:
return C_REGREG
case obj.TYPE_REGREG2:
return C_REGREG2
case obj.TYPE_REGLIST:
return C_REGLIST
case obj.TYPE_SHIFT:
if a.Reg == 0 {
// register shift R>>i
return C_SHIFT
} else {
// memory address with shifted offset R>>i(R)
return C_SHIFTADDR
}
case obj.TYPE_MEM:
switch a.Name {
case obj.NAME_EXTERN,
obj.NAME_GOTREF,
obj.NAME_STATIC:
if a.Sym == nil || a.Sym.Name == "" {
fmt.Printf("null sym external\n")
return C_GOK
}
c.instoffset = 0 // s.b. unused but just in case
if a.Sym.Type == objabi.STLSBSS {
if c.ctxt.Flag_shared {
return C_TLS_IE
} else {
return C_TLS_LE
}
}
return C_ADDR
case obj.NAME_AUTO:
if a.Reg == REGSP {
// unset base register for better printing, since
// a.Offset is still relative to pseudo-SP.
a.Reg = obj.REG_NONE
}
c.instoffset = c.autosize + a.Offset
if t := immaddr(int32(c.instoffset)); t != 0 {
if immhalf(int32(c.instoffset)) {
if immfloat(t) {
return C_HFAUTO
}
return C_HAUTO
}
if immfloat(t) {
return C_FAUTO
}
return C_SAUTO
}
return C_LAUTO
case obj.NAME_PARAM:
if a.Reg == REGSP {
// unset base register for better printing, since
// a.Offset is still relative to pseudo-FP.
a.Reg = obj.REG_NONE
}
c.instoffset = c.autosize + a.Offset + 4
if t := immaddr(int32(c.instoffset)); t != 0 {
if immhalf(int32(c.instoffset)) {
if immfloat(t) {
return C_HFAUTO
}
return C_HAUTO
}
if immfloat(t) {
return C_FAUTO
}
return C_SAUTO
}
return C_LAUTO
case obj.NAME_NONE:
c.instoffset = a.Offset
if t := immaddr(int32(c.instoffset)); t != 0 {
if immhalf(int32(c.instoffset)) { /* n.b. that it will also satisfy immrot */
if immfloat(t) {
return C_HFOREG
}
return C_HOREG
}
if immfloat(t) {
return C_FOREG /* n.b. that it will also satisfy immrot */
}
if immrot(uint32(c.instoffset)) != 0 {
return C_SROREG
}
if immhalf(int32(c.instoffset)) {
return C_HOREG
}
return C_SOREG
}
if immrot(uint32(c.instoffset)) != 0 {
return C_ROREG
}
return C_LOREG
}
return C_GOK
case obj.TYPE_FCONST:
if c.chipzero5(a.Val.(float64)) >= 0 {
return C_ZFCON
}
if c.chipfloat5(a.Val.(float64)) >= 0 {
return C_SFCON
}
return C_LFCON
case obj.TYPE_TEXTSIZE:
return C_TEXTSIZE
case obj.TYPE_CONST,
obj.TYPE_ADDR:
switch a.Name {
case obj.NAME_NONE:
c.instoffset = a.Offset
if a.Reg != 0 {
return c.aconsize()
}
if immrot(uint32(c.instoffset)) != 0 {
return C_RCON
}
if immrot(^uint32(c.instoffset)) != 0 {
return C_NCON
}
if uint32(c.instoffset) <= 0xffff && buildcfg.GOARM.Version == 7 {
return C_SCON
}
if x, y := immrot2a(uint32(c.instoffset)); x != 0 && y != 0 {
return C_RCON2A
}
if y, x := immrot2s(uint32(c.instoffset)); x != 0 && y != 0 {
return C_RCON2S
}
return C_LCON
case obj.NAME_EXTERN,
obj.NAME_GOTREF,
obj.NAME_STATIC:
s := a.Sym
if s == nil {
break