mirror of
https://github.com/golang/go
synced 2024-10-04 06:21:23 -06:00
08ee2661f2
LGTM=rsc R=rsc, iant CC=golang-codereviews https://golang.org/cl/115300044
1078 lines
22 KiB
C
1078 lines
22 KiB
C
// Derived from Inferno utils/5c/swt.c
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// http://code.google.com/p/inferno-os/source/browse/utils/5c/swt.c
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//
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// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
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// Portions Copyright © 1997-1999 Vita Nuova Limited
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// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
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// Portions Copyright © 2004,2006 Bruce Ellis
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// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
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// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
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// Portions Copyright © 2009 The Go Authors. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <link.h>
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#include "../cmd/5l/5.out.h"
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#include "../pkg/runtime/stack.h"
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static Prog zprg = {
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.as = AGOK,
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.scond = C_SCOND_NONE,
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.reg = NREG,
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.from = {
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.name = D_NONE,
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.type = D_NONE,
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.reg = NREG,
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},
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.to = {
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.name = D_NONE,
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.type = D_NONE,
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.reg = NREG,
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},
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};
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static int
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symtype(Addr *a)
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{
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return a->name;
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}
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static int
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isdata(Prog *p)
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{
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return p->as == ADATA || p->as == AGLOBL;
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}
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static int
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iscall(Prog *p)
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{
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return p->as == ABL;
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}
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static int
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datasize(Prog *p)
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{
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return p->reg;
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}
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static int
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textflag(Prog *p)
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{
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return p->reg;
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}
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static void
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settextflag(Prog *p, int f)
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{
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p->reg = f;
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}
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static void
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progedit(Link *ctxt, Prog *p)
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{
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char literal[64];
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LSym *s;
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static LSym *tlsfallback;
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p->from.class = 0;
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p->to.class = 0;
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// Rewrite B/BL to symbol as D_BRANCH.
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switch(p->as) {
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case AB:
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case ABL:
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case ADUFFZERO:
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case ADUFFCOPY:
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if(p->to.type == D_OREG && (p->to.name == D_EXTERN || p->to.name == D_STATIC) && p->to.sym != nil)
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p->to.type = D_BRANCH;
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break;
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}
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// Replace TLS register fetches on older ARM procesors.
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switch(p->as) {
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case AMRC:
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// Treat MRC 15, 0, <reg>, C13, C0, 3 specially.
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if((p->to.offset & 0xffff0fff) == 0xee1d0f70) {
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// Because the instruction might be rewriten to a BL which returns in R0
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// the register must be zero.
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if ((p->to.offset & 0xf000) != 0)
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ctxt->diag("%L: TLS MRC instruction must write to R0 as it might get translated into a BL instruction", p->lineno);
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if(ctxt->goarm < 7) {
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// Replace it with BL runtime.read_tls_fallback(SB).
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if(tlsfallback == nil)
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tlsfallback = linklookup(ctxt, "runtime.read_tls_fallback", 0);
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// BL runtime.read_tls_fallback(SB)
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p->as = ABL;
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p->to.type = D_BRANCH;
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p->to.sym = tlsfallback;
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p->to.offset = 0;
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break;
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}
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}
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// Otherwise, MRC/MCR instructions need no further treatment.
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p->as = AWORD;
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break;
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}
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// Rewrite float constants to values stored in memory.
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switch(p->as) {
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case AMOVF:
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if(p->from.type == D_FCONST && chipfloat5(ctxt, p->from.u.dval) < 0 &&
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(chipzero5(ctxt, p->from.u.dval) < 0 || (p->scond & C_SCOND) != C_SCOND_NONE)) {
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int32 i32;
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float32 f32;
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f32 = p->from.u.dval;
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memmove(&i32, &f32, 4);
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sprint(literal, "$f32.%08ux", (uint32)i32);
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s = linklookup(ctxt, literal, 0);
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if(s->type == 0) {
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s->type = SRODATA;
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adduint32(ctxt, s, i32);
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s->reachable = 0;
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}
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p->from.type = D_OREG;
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p->from.sym = s;
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p->from.name = D_EXTERN;
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p->from.offset = 0;
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}
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break;
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case AMOVD:
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if(p->from.type == D_FCONST && chipfloat5(ctxt, p->from.u.dval) < 0 &&
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(chipzero5(ctxt, p->from.u.dval) < 0 || (p->scond & C_SCOND) != C_SCOND_NONE)) {
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int64 i64;
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memmove(&i64, &p->from.u.dval, 8);
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sprint(literal, "$f64.%016llux", (uvlong)i64);
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s = linklookup(ctxt, literal, 0);
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if(s->type == 0) {
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s->type = SRODATA;
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adduint64(ctxt, s, i64);
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s->reachable = 0;
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}
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p->from.type = D_OREG;
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p->from.sym = s;
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p->from.name = D_EXTERN;
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p->from.offset = 0;
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}
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break;
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}
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if(ctxt->flag_shared) {
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// Shared libraries use R_ARM_TLS_IE32 instead of
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// R_ARM_TLS_LE32, replacing the link time constant TLS offset in
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// runtime.tlsg with an address to a GOT entry containing the
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// offset. Rewrite $runtime.tlsg(SB) to runtime.tlsg(SB) to
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// compensate.
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if(ctxt->tlsg == nil)
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ctxt->tlsg = linklookup(ctxt, "runtime.tlsg", 0);
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if(p->from.type == D_CONST && p->from.name == D_EXTERN && p->from.sym == ctxt->tlsg)
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p->from.type = D_OREG;
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if(p->to.type == D_CONST && p->to.name == D_EXTERN && p->to.sym == ctxt->tlsg)
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p->to.type = D_OREG;
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}
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}
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static Prog*
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prg(void)
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{
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Prog *p;
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p = emallocz(sizeof(*p));
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*p = zprg;
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return p;
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}
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static Prog* stacksplit(Link*, Prog*, int32, int);
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static void initdiv(Link*);
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static void softfloat(Link*, LSym*);
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// Prog.mark
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enum
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{
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FOLL = 1<<0,
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LABEL = 1<<1,
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LEAF = 1<<2,
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};
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static void
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linkcase(Prog *casep)
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{
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Prog *p;
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for(p = casep; p != nil; p = p->link){
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if(p->as == ABCASE) {
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for(; p != nil && p->as == ABCASE; p = p->link)
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p->pcrel = casep;
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break;
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}
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}
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}
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static void
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nocache(Prog *p)
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{
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p->optab = 0;
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p->from.class = 0;
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p->to.class = 0;
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}
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static void
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addstacksplit(Link *ctxt, LSym *cursym)
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{
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Prog *p, *pl, *q, *q1, *q2;
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int o;
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int32 autosize, autoffset;
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autosize = 0;
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if(ctxt->symmorestack[0] == nil) {
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ctxt->symmorestack[0] = linklookup(ctxt, "runtime.morestack", 0);
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ctxt->symmorestack[1] = linklookup(ctxt, "runtime.morestack_noctxt", 0);
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}
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q = nil;
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ctxt->cursym = cursym;
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if(cursym->text == nil || cursym->text->link == nil)
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return;
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softfloat(ctxt, cursym);
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p = cursym->text;
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autoffset = p->to.offset;
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if(autoffset < 0)
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autoffset = 0;
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cursym->locals = autoffset;
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cursym->args = p->to.offset2;
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if(ctxt->debugzerostack) {
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if(autoffset && !(p->reg&NOSPLIT)) {
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// MOVW $4(R13), R1
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p = appendp(ctxt, p);
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p->as = AMOVW;
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p->from.type = D_CONST;
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p->from.reg = 13;
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p->from.offset = 4;
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p->to.type = D_REG;
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p->to.reg = 1;
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// MOVW $n(R13), R2
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p = appendp(ctxt, p);
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p->as = AMOVW;
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p->from.type = D_CONST;
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p->from.reg = 13;
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p->from.offset = 4 + autoffset;
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p->to.type = D_REG;
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p->to.reg = 2;
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// MOVW $0, R3
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p = appendp(ctxt, p);
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p->as = AMOVW;
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p->from.type = D_CONST;
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p->from.offset = 0;
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p->to.type = D_REG;
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p->to.reg = 3;
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// L:
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// MOVW.nil R3, 0(R1) +4
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// CMP R1, R2
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// BNE L
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p = pl = appendp(ctxt, p);
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p->as = AMOVW;
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p->from.type = D_REG;
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p->from.reg = 3;
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p->to.type = D_OREG;
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p->to.reg = 1;
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p->to.offset = 4;
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p->scond |= C_PBIT;
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p = appendp(ctxt, p);
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p->as = ACMP;
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p->from.type = D_REG;
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p->from.reg = 1;
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p->reg = 2;
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p = appendp(ctxt, p);
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p->as = ABNE;
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p->to.type = D_BRANCH;
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p->pcond = pl;
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}
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}
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/*
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* find leaf subroutines
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* strip NOPs
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* expand RET
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* expand BECOME pseudo
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*/
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for(p = cursym->text; p != nil; p = p->link) {
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switch(p->as) {
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case ACASE:
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if(ctxt->flag_shared)
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linkcase(p);
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break;
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case ATEXT:
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p->mark |= LEAF;
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break;
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case ARET:
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break;
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case ADIV:
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case ADIVU:
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case AMOD:
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case AMODU:
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q = p;
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if(ctxt->sym_div == nil)
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initdiv(ctxt);
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cursym->text->mark &= ~LEAF;
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continue;
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case ANOP:
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q1 = p->link;
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q->link = q1; /* q is non-nop */
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if(q1 != nil)
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q1->mark |= p->mark;
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continue;
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case ABL:
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case ABX:
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case ADUFFZERO:
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case ADUFFCOPY:
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cursym->text->mark &= ~LEAF;
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case ABCASE:
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case AB:
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case ABEQ:
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case ABNE:
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case ABCS:
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case ABHS:
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case ABCC:
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case ABLO:
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case ABMI:
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case ABPL:
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case ABVS:
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case ABVC:
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case ABHI:
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case ABLS:
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case ABGE:
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case ABLT:
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case ABGT:
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case ABLE:
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q1 = p->pcond;
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if(q1 != nil) {
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while(q1->as == ANOP) {
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q1 = q1->link;
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p->pcond = q1;
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}
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}
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break;
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}
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q = p;
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}
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for(p = cursym->text; p != nil; p = p->link) {
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o = p->as;
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switch(o) {
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case ATEXT:
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autosize = p->to.offset + 4;
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if(autosize <= 4)
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if(cursym->text->mark & LEAF) {
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p->to.offset = -4;
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autosize = 0;
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}
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if(!autosize && !(cursym->text->mark & LEAF)) {
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if(ctxt->debugvlog) {
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Bprint(ctxt->bso, "save suppressed in: %s\n",
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cursym->name);
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Bflush(ctxt->bso);
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}
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cursym->text->mark |= LEAF;
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}
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if(cursym->text->mark & LEAF) {
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cursym->leaf = 1;
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if(!autosize)
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break;
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}
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if(!(p->reg & NOSPLIT))
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p = stacksplit(ctxt, p, autosize, !(cursym->text->reg&NEEDCTXT)); // emit split check
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// MOVW.W R14,$-autosize(SP)
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p = appendp(ctxt, p);
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p->as = AMOVW;
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p->scond |= C_WBIT;
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p->from.type = D_REG;
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p->from.reg = REGLINK;
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p->to.type = D_OREG;
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p->to.offset = -autosize;
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p->to.reg = REGSP;
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p->spadj = autosize;
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if(cursym->text->reg & WRAPPER) {
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// g->panicwrap += autosize;
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// MOVW panicwrap_offset(g), R3
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// ADD $autosize, R3
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// MOVW R3 panicwrap_offset(g)
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p = appendp(ctxt, p);
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p->as = AMOVW;
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p->from.type = D_OREG;
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p->from.reg = REGG;
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p->from.offset = 2*ctxt->arch->ptrsize;
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p->to.type = D_REG;
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p->to.reg = 3;
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p = appendp(ctxt, p);
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p->as = AADD;
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p->from.type = D_CONST;
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p->from.offset = autosize;
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p->to.type = D_REG;
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p->to.reg = 3;
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|
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p = appendp(ctxt, p);
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p->as = AMOVW;
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p->from.type = D_REG;
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p->from.reg = 3;
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p->to.type = D_OREG;
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p->to.reg = REGG;
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p->to.offset = 2*ctxt->arch->ptrsize;
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}
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break;
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case ARET:
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nocache(p);
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if(cursym->text->mark & LEAF) {
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if(!autosize) {
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p->as = AB;
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p->from = zprg.from;
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if(p->to.sym) { // retjmp
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p->to.type = D_BRANCH;
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} else {
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p->to.type = D_OREG;
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p->to.offset = 0;
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p->to.reg = REGLINK;
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}
|
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break;
|
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}
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}
|
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|
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if(cursym->text->reg & WRAPPER) {
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int scond;
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|
|
// Preserve original RET's cond, to allow RET.EQ
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|
// in the implementation of reflect.call.
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|
scond = p->scond;
|
|
p->scond = C_SCOND_NONE;
|
|
|
|
// g->panicwrap -= autosize;
|
|
// MOVW panicwrap_offset(g), R3
|
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// SUB $autosize, R3
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// MOVW R3 panicwrap_offset(g)
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|
p->as = AMOVW;
|
|
p->from.type = D_OREG;
|
|
p->from.reg = REGG;
|
|
p->from.offset = 2*ctxt->arch->ptrsize;
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|
p->to.type = D_REG;
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|
p->to.reg = 3;
|
|
p = appendp(ctxt, p);
|
|
|
|
p->as = ASUB;
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|
p->from.type = D_CONST;
|
|
p->from.offset = autosize;
|
|
p->to.type = D_REG;
|
|
p->to.reg = 3;
|
|
p = appendp(ctxt, p);
|
|
|
|
p->as = AMOVW;
|
|
p->from.type = D_REG;
|
|
p->from.reg = 3;
|
|
p->to.type = D_OREG;
|
|
p->to.reg = REGG;
|
|
p->to.offset = 2*ctxt->arch->ptrsize;
|
|
p = appendp(ctxt, p);
|
|
|
|
p->scond = scond;
|
|
}
|
|
|
|
p->as = AMOVW;
|
|
p->scond |= C_PBIT;
|
|
p->from.type = D_OREG;
|
|
p->from.offset = autosize;
|
|
p->from.reg = REGSP;
|
|
p->to.type = D_REG;
|
|
p->to.reg = REGPC;
|
|
// If there are instructions following
|
|
// this ARET, they come from a branch
|
|
// with the same stackframe, so no spadj.
|
|
|
|
if(p->to.sym) { // retjmp
|
|
p->to.reg = REGLINK;
|
|
q2 = appendp(ctxt, p);
|
|
q2->as = AB;
|
|
q2->to.type = D_BRANCH;
|
|
q2->to.sym = p->to.sym;
|
|
p->to.sym = nil;
|
|
p = q2;
|
|
}
|
|
break;
|
|
|
|
case AADD:
|
|
if(p->from.type == D_CONST && p->from.reg == NREG && p->to.type == D_REG && p->to.reg == REGSP)
|
|
p->spadj = -p->from.offset;
|
|
break;
|
|
|
|
case ASUB:
|
|
if(p->from.type == D_CONST && p->from.reg == NREG && p->to.type == D_REG && p->to.reg == REGSP)
|
|
p->spadj = p->from.offset;
|
|
break;
|
|
|
|
case ADIV:
|
|
case ADIVU:
|
|
case AMOD:
|
|
case AMODU:
|
|
if(ctxt->debugdivmod)
|
|
break;
|
|
if(p->from.type != D_REG)
|
|
break;
|
|
if(p->to.type != D_REG)
|
|
break;
|
|
q1 = p;
|
|
|
|
/* MOV a,4(SP) */
|
|
p = appendp(ctxt, p);
|
|
p->as = AMOVW;
|
|
p->lineno = q1->lineno;
|
|
p->from.type = D_REG;
|
|
p->from.reg = q1->from.reg;
|
|
p->to.type = D_OREG;
|
|
p->to.reg = REGSP;
|
|
p->to.offset = 4;
|
|
|
|
/* MOV b,REGTMP */
|
|
p = appendp(ctxt, p);
|
|
p->as = AMOVW;
|
|
p->lineno = q1->lineno;
|
|
p->from.type = D_REG;
|
|
p->from.reg = q1->reg;
|
|
if(q1->reg == NREG)
|
|
p->from.reg = q1->to.reg;
|
|
p->to.type = D_REG;
|
|
p->to.reg = REGTMP;
|
|
p->to.offset = 0;
|
|
|
|
/* CALL appropriate */
|
|
p = appendp(ctxt, p);
|
|
p->as = ABL;
|
|
p->lineno = q1->lineno;
|
|
p->to.type = D_BRANCH;
|
|
switch(o) {
|
|
case ADIV:
|
|
p->to.sym = ctxt->sym_div;
|
|
break;
|
|
case ADIVU:
|
|
p->to.sym = ctxt->sym_divu;
|
|
break;
|
|
case AMOD:
|
|
p->to.sym = ctxt->sym_mod;
|
|
break;
|
|
case AMODU:
|
|
p->to.sym = ctxt->sym_modu;
|
|
break;
|
|
}
|
|
|
|
/* MOV REGTMP, b */
|
|
p = appendp(ctxt, p);
|
|
p->as = AMOVW;
|
|
p->lineno = q1->lineno;
|
|
p->from.type = D_REG;
|
|
p->from.reg = REGTMP;
|
|
p->from.offset = 0;
|
|
p->to.type = D_REG;
|
|
p->to.reg = q1->to.reg;
|
|
|
|
/* ADD $8,SP */
|
|
p = appendp(ctxt, p);
|
|
p->as = AADD;
|
|
p->lineno = q1->lineno;
|
|
p->from.type = D_CONST;
|
|
p->from.reg = NREG;
|
|
p->from.offset = 8;
|
|
p->reg = NREG;
|
|
p->to.type = D_REG;
|
|
p->to.reg = REGSP;
|
|
p->spadj = -8;
|
|
|
|
/* Keep saved LR at 0(SP) after SP change. */
|
|
/* MOVW 0(SP), REGTMP; MOVW REGTMP, -8!(SP) */
|
|
/* TODO: Remove SP adjustments; see issue 6699. */
|
|
q1->as = AMOVW;
|
|
q1->from.type = D_OREG;
|
|
q1->from.reg = REGSP;
|
|
q1->from.offset = 0;
|
|
q1->reg = NREG;
|
|
q1->to.type = D_REG;
|
|
q1->to.reg = REGTMP;
|
|
|
|
/* SUB $8,SP */
|
|
q1 = appendp(ctxt, q1);
|
|
q1->as = AMOVW;
|
|
q1->from.type = D_REG;
|
|
q1->from.reg = REGTMP;
|
|
q1->reg = NREG;
|
|
q1->to.type = D_OREG;
|
|
q1->to.reg = REGSP;
|
|
q1->to.offset = -8;
|
|
q1->scond |= C_WBIT;
|
|
q1->spadj = 8;
|
|
|
|
break;
|
|
case AMOVW:
|
|
if((p->scond & C_WBIT) && p->to.type == D_OREG && p->to.reg == REGSP)
|
|
p->spadj = -p->to.offset;
|
|
if((p->scond & C_PBIT) && p->from.type == D_OREG && p->from.reg == REGSP && p->to.reg != REGPC)
|
|
p->spadj = -p->from.offset;
|
|
if(p->from.type == D_CONST && p->from.reg == REGSP && p->to.type == D_REG && p->to.reg == REGSP)
|
|
p->spadj = -p->from.offset;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
softfloat(Link *ctxt, LSym *cursym)
|
|
{
|
|
Prog *p, *next;
|
|
LSym *symsfloat;
|
|
int wasfloat;
|
|
|
|
if(ctxt->goarm > 5)
|
|
return;
|
|
|
|
symsfloat = linklookup(ctxt, "_sfloat", 0);
|
|
|
|
wasfloat = 0;
|
|
for(p = cursym->text; p != nil; p = p->link)
|
|
if(p->pcond != nil)
|
|
p->pcond->mark |= LABEL;
|
|
for(p = cursym->text; p != nil; p = p->link) {
|
|
switch(p->as) {
|
|
case AMOVW:
|
|
if(p->to.type == D_FREG || p->from.type == D_FREG)
|
|
goto soft;
|
|
goto notsoft;
|
|
|
|
case AMOVWD:
|
|
case AMOVWF:
|
|
case AMOVDW:
|
|
case AMOVFW:
|
|
case AMOVFD:
|
|
case AMOVDF:
|
|
case AMOVF:
|
|
case AMOVD:
|
|
|
|
case ACMPF:
|
|
case ACMPD:
|
|
case AADDF:
|
|
case AADDD:
|
|
case ASUBF:
|
|
case ASUBD:
|
|
case AMULF:
|
|
case AMULD:
|
|
case ADIVF:
|
|
case ADIVD:
|
|
case ASQRTF:
|
|
case ASQRTD:
|
|
case AABSF:
|
|
case AABSD:
|
|
goto soft;
|
|
|
|
default:
|
|
goto notsoft;
|
|
}
|
|
|
|
soft:
|
|
if (!wasfloat || (p->mark&LABEL)) {
|
|
next = ctxt->arch->prg();
|
|
*next = *p;
|
|
|
|
// BL _sfloat(SB)
|
|
*p = zprg;
|
|
p->link = next;
|
|
p->as = ABL;
|
|
p->to.type = D_BRANCH;
|
|
p->to.sym = symsfloat;
|
|
p->lineno = next->lineno;
|
|
|
|
p = next;
|
|
wasfloat = 1;
|
|
}
|
|
continue;
|
|
|
|
notsoft:
|
|
wasfloat = 0;
|
|
}
|
|
}
|
|
|
|
static Prog*
|
|
stacksplit(Link *ctxt, Prog *p, int32 framesize, int noctxt)
|
|
{
|
|
int32 arg;
|
|
|
|
// MOVW g_stackguard(g), R1
|
|
p = appendp(ctxt, p);
|
|
p->as = AMOVW;
|
|
p->from.type = D_OREG;
|
|
p->from.reg = REGG;
|
|
p->to.type = D_REG;
|
|
p->to.reg = 1;
|
|
|
|
if(framesize <= StackSmall) {
|
|
// small stack: SP < stackguard
|
|
// CMP stackguard, SP
|
|
p = appendp(ctxt, p);
|
|
p->as = ACMP;
|
|
p->from.type = D_REG;
|
|
p->from.reg = 1;
|
|
p->reg = REGSP;
|
|
} else if(framesize <= StackBig) {
|
|
// large stack: SP-framesize < stackguard-StackSmall
|
|
// MOVW $-framesize(SP), R2
|
|
// CMP stackguard, R2
|
|
p = appendp(ctxt, p);
|
|
p->as = AMOVW;
|
|
p->from.type = D_CONST;
|
|
p->from.reg = REGSP;
|
|
p->from.offset = -framesize;
|
|
p->to.type = D_REG;
|
|
p->to.reg = 2;
|
|
|
|
p = appendp(ctxt, p);
|
|
p->as = ACMP;
|
|
p->from.type = D_REG;
|
|
p->from.reg = 1;
|
|
p->reg = 2;
|
|
} else {
|
|
// Such a large stack we need to protect against wraparound
|
|
// if SP is close to zero.
|
|
// SP-stackguard+StackGuard < framesize + (StackGuard-StackSmall)
|
|
// The +StackGuard on both sides is required to keep the left side positive:
|
|
// SP is allowed to be slightly below stackguard. See stack.h.
|
|
// CMP $StackPreempt, R1
|
|
// MOVW.NE $StackGuard(SP), R2
|
|
// SUB.NE R1, R2
|
|
// MOVW.NE $(framesize+(StackGuard-StackSmall)), R3
|
|
// CMP.NE R3, R2
|
|
p = appendp(ctxt, p);
|
|
p->as = ACMP;
|
|
p->from.type = D_CONST;
|
|
p->from.offset = (uint32)StackPreempt;
|
|
p->reg = 1;
|
|
|
|
p = appendp(ctxt, p);
|
|
p->as = AMOVW;
|
|
p->from.type = D_CONST;
|
|
p->from.reg = REGSP;
|
|
p->from.offset = StackGuard;
|
|
p->to.type = D_REG;
|
|
p->to.reg = 2;
|
|
p->scond = C_SCOND_NE;
|
|
|
|
p = appendp(ctxt, p);
|
|
p->as = ASUB;
|
|
p->from.type = D_REG;
|
|
p->from.reg = 1;
|
|
p->to.type = D_REG;
|
|
p->to.reg = 2;
|
|
p->scond = C_SCOND_NE;
|
|
|
|
p = appendp(ctxt, p);
|
|
p->as = AMOVW;
|
|
p->from.type = D_CONST;
|
|
p->from.offset = framesize + (StackGuard - StackSmall);
|
|
p->to.type = D_REG;
|
|
p->to.reg = 3;
|
|
p->scond = C_SCOND_NE;
|
|
|
|
p = appendp(ctxt, p);
|
|
p->as = ACMP;
|
|
p->from.type = D_REG;
|
|
p->from.reg = 3;
|
|
p->reg = 2;
|
|
p->scond = C_SCOND_NE;
|
|
}
|
|
|
|
// MOVW.LS $framesize, R1
|
|
p = appendp(ctxt, p);
|
|
p->as = AMOVW;
|
|
p->scond = C_SCOND_LS;
|
|
p->from.type = D_CONST;
|
|
p->from.offset = framesize;
|
|
p->to.type = D_REG;
|
|
p->to.reg = 1;
|
|
|
|
// MOVW.LS $args, R2
|
|
p = appendp(ctxt, p);
|
|
p->as = AMOVW;
|
|
p->scond = C_SCOND_LS;
|
|
p->from.type = D_CONST;
|
|
arg = ctxt->cursym->text->to.offset2;
|
|
if(arg == 1) // special marker for known 0
|
|
arg = 0;
|
|
if(arg&3)
|
|
ctxt->diag("misaligned argument size in stack split");
|
|
p->from.offset = arg;
|
|
p->to.type = D_REG;
|
|
p->to.reg = 2;
|
|
|
|
// MOVW.LS R14, R3
|
|
p = appendp(ctxt, p);
|
|
p->as = AMOVW;
|
|
p->scond = C_SCOND_LS;
|
|
p->from.type = D_REG;
|
|
p->from.reg = REGLINK;
|
|
p->to.type = D_REG;
|
|
p->to.reg = 3;
|
|
|
|
// BL.LS runtime.morestack(SB) // modifies LR, returns with LO still asserted
|
|
p = appendp(ctxt, p);
|
|
p->as = ABL;
|
|
p->scond = C_SCOND_LS;
|
|
p->to.type = D_BRANCH;
|
|
p->to.sym = ctxt->symmorestack[noctxt];
|
|
|
|
// BLS start
|
|
p = appendp(ctxt, p);
|
|
p->as = ABLS;
|
|
p->to.type = D_BRANCH;
|
|
p->pcond = ctxt->cursym->text->link;
|
|
|
|
return p;
|
|
}
|
|
|
|
static void
|
|
initdiv(Link *ctxt)
|
|
{
|
|
if(ctxt->sym_div != nil)
|
|
return;
|
|
ctxt->sym_div = linklookup(ctxt, "_div", 0);
|
|
ctxt->sym_divu = linklookup(ctxt, "_divu", 0);
|
|
ctxt->sym_mod = linklookup(ctxt, "_mod", 0);
|
|
ctxt->sym_modu = linklookup(ctxt, "_modu", 0);
|
|
}
|
|
|
|
static void xfol(Link*, Prog*, Prog**);
|
|
|
|
static void
|
|
follow(Link *ctxt, LSym *s)
|
|
{
|
|
Prog *firstp, *lastp;
|
|
|
|
ctxt->cursym = s;
|
|
|
|
firstp = ctxt->arch->prg();
|
|
lastp = firstp;
|
|
xfol(ctxt, s->text, &lastp);
|
|
lastp->link = nil;
|
|
s->text = firstp->link;
|
|
}
|
|
|
|
static int
|
|
relinv(int a)
|
|
{
|
|
switch(a) {
|
|
case ABEQ: return ABNE;
|
|
case ABNE: return ABEQ;
|
|
case ABCS: return ABCC;
|
|
case ABHS: return ABLO;
|
|
case ABCC: return ABCS;
|
|
case ABLO: return ABHS;
|
|
case ABMI: return ABPL;
|
|
case ABPL: return ABMI;
|
|
case ABVS: return ABVC;
|
|
case ABVC: return ABVS;
|
|
case ABHI: return ABLS;
|
|
case ABLS: return ABHI;
|
|
case ABGE: return ABLT;
|
|
case ABLT: return ABGE;
|
|
case ABGT: return ABLE;
|
|
case ABLE: return ABGT;
|
|
}
|
|
sysfatal("unknown relation: %s", anames5[a]);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
xfol(Link *ctxt, Prog *p, Prog **last)
|
|
{
|
|
Prog *q, *r;
|
|
int a, i;
|
|
|
|
loop:
|
|
if(p == nil)
|
|
return;
|
|
a = p->as;
|
|
if(a == AB) {
|
|
q = p->pcond;
|
|
if(q != nil && q->as != ATEXT) {
|
|
p->mark |= FOLL;
|
|
p = q;
|
|
if(!(p->mark & FOLL))
|
|
goto loop;
|
|
}
|
|
}
|
|
if(p->mark & FOLL) {
|
|
for(i=0,q=p; i<4; i++,q=q->link) {
|
|
if(q == *last || q == nil)
|
|
break;
|
|
a = q->as;
|
|
if(a == ANOP) {
|
|
i--;
|
|
continue;
|
|
}
|
|
if(a == AB || (a == ARET && q->scond == C_SCOND_NONE) || a == ARFE || a == AUNDEF)
|
|
goto copy;
|
|
if(q->pcond == nil || (q->pcond->mark&FOLL))
|
|
continue;
|
|
if(a != ABEQ && a != ABNE)
|
|
continue;
|
|
copy:
|
|
for(;;) {
|
|
r = ctxt->arch->prg();
|
|
*r = *p;
|
|
if(!(r->mark&FOLL))
|
|
print("can't happen 1\n");
|
|
r->mark |= FOLL;
|
|
if(p != q) {
|
|
p = p->link;
|
|
(*last)->link = r;
|
|
*last = r;
|
|
continue;
|
|
}
|
|
(*last)->link = r;
|
|
*last = r;
|
|
if(a == AB || (a == ARET && q->scond == C_SCOND_NONE) || a == ARFE || a == AUNDEF)
|
|
return;
|
|
r->as = ABNE;
|
|
if(a == ABNE)
|
|
r->as = ABEQ;
|
|
r->pcond = p->link;
|
|
r->link = p->pcond;
|
|
if(!(r->link->mark&FOLL))
|
|
xfol(ctxt, r->link, last);
|
|
if(!(r->pcond->mark&FOLL))
|
|
print("can't happen 2\n");
|
|
return;
|
|
}
|
|
}
|
|
a = AB;
|
|
q = ctxt->arch->prg();
|
|
q->as = a;
|
|
q->lineno = p->lineno;
|
|
q->to.type = D_BRANCH;
|
|
q->to.offset = p->pc;
|
|
q->pcond = p;
|
|
p = q;
|
|
}
|
|
p->mark |= FOLL;
|
|
(*last)->link = p;
|
|
*last = p;
|
|
if(a == AB || (a == ARET && p->scond == C_SCOND_NONE) || a == ARFE || a == AUNDEF){
|
|
return;
|
|
}
|
|
if(p->pcond != nil)
|
|
if(a != ABL && a != ABX && p->link != nil) {
|
|
q = brchain(ctxt, p->link);
|
|
if(a != ATEXT && a != ABCASE)
|
|
if(q != nil && (q->mark&FOLL)) {
|
|
p->as = relinv(a);
|
|
p->link = p->pcond;
|
|
p->pcond = q;
|
|
}
|
|
xfol(ctxt, p->link, last);
|
|
q = brchain(ctxt, p->pcond);
|
|
if(q == nil)
|
|
q = p->pcond;
|
|
if(q->mark&FOLL) {
|
|
p->pcond = q;
|
|
return;
|
|
}
|
|
p = q;
|
|
goto loop;
|
|
}
|
|
p = p->link;
|
|
goto loop;
|
|
}
|
|
|
|
LinkArch linkarm = {
|
|
.name = "arm",
|
|
.thechar = '5',
|
|
.endian = LittleEndian,
|
|
|
|
.addstacksplit = addstacksplit,
|
|
.assemble = span5,
|
|
.datasize = datasize,
|
|
.follow = follow,
|
|
.iscall = iscall,
|
|
.isdata = isdata,
|
|
.prg = prg,
|
|
.progedit = progedit,
|
|
.settextflag = settextflag,
|
|
.symtype = symtype,
|
|
.textflag = textflag,
|
|
|
|
.minlc = 4,
|
|
.ptrsize = 4,
|
|
.regsize = 4,
|
|
|
|
.D_ADDR = D_ADDR,
|
|
.D_AUTO = D_AUTO,
|
|
.D_BRANCH = D_BRANCH,
|
|
.D_CONST = D_CONST,
|
|
.D_EXTERN = D_EXTERN,
|
|
.D_FCONST = D_FCONST,
|
|
.D_NONE = D_NONE,
|
|
.D_PARAM = D_PARAM,
|
|
.D_SCONST = D_SCONST,
|
|
.D_STATIC = D_STATIC,
|
|
|
|
.ACALL = ABL,
|
|
.ADATA = ADATA,
|
|
.AEND = AEND,
|
|
.AFUNCDATA = AFUNCDATA,
|
|
.AGLOBL = AGLOBL,
|
|
.AJMP = AB,
|
|
.ANOP = ANOP,
|
|
.APCDATA = APCDATA,
|
|
.ARET = ARET,
|
|
.ATEXT = ATEXT,
|
|
.ATYPE = ATYPE,
|
|
.AUSEFIELD = AUSEFIELD,
|
|
};
|