mirror of
https://github.com/golang/go
synced 2024-10-04 13:31:21 -06:00
0c54225b51
The recent linker changes broke NaCl support a month ago, and there are no known users of it. The NaCl code can always be recovered from the repository history. R=adg, r CC=golang-dev https://golang.org/cl/3671042
760 lines
15 KiB
C
760 lines
15 KiB
C
// Inferno utils/8l/obj.c
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// http://code.google.com/p/inferno-os/source/browse/utils/8l/obj.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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// Reading object files.
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#define EXTERN
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#include "l.h"
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#include "../ld/lib.h"
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#include "../ld/elf.h"
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#include "../ld/macho.h"
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#include "../ld/dwarf.h"
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#include "../ld/pe.h"
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#include <ar.h>
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#ifndef DEFAULT
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#define DEFAULT '9'
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#endif
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char *noname = "<none>";
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char thechar = '8';
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char *thestring = "386";
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/*
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* -H0 -T0x40004C -D0x10000000 is garbage unix
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* -H1 -T0xd0 -R4 is unix coff
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* -H2 -T4128 -R4096 is plan9 format
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* -H3 -Tx -Rx is MS-DOS .COM
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* -H4 -Tx -Rx is fake MS-DOS .EXE
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* -H6 -Tx -Rx is Apple Mach-O
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* -H7 -Tx -Rx is Linux ELF32
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* -H8 -Tx -Rx was Google Native Client
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* -H9 -Tx -Rx is FreeBSD ELF32
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* -H10 -Tx -Rx is MS Windows PE
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* -H11 -Tx -Rx is tiny (os image)
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*/
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void
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usage(void)
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{
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fprint(2, "usage: 8l [-options] [-E entry] [-H head] [-L dir] [-T text] [-R rnd] [-r path] [-o out] main.8\n");
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exits("usage");
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}
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void
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main(int argc, char *argv[])
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{
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int c;
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Binit(&bso, 1, OWRITE);
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cout = -1;
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listinit();
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memset(debug, 0, sizeof(debug));
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nerrors = 0;
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outfile = nil;
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HEADTYPE = -1;
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INITTEXT = -1;
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INITDAT = -1;
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INITRND = -1;
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INITENTRY = 0;
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ARGBEGIN {
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default:
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c = ARGC();
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if(c == 'l')
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usage();
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if(c >= 0 && c < sizeof(debug))
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debug[c]++;
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break;
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case 'o': /* output to (next arg) */
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outfile = EARGF(usage());
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break;
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case 'E':
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INITENTRY = EARGF(usage());
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break;
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case 'H':
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HEADTYPE = atolwhex(EARGF(usage()));
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break;
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case 'L':
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Lflag(EARGF(usage()));
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break;
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case 'T':
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INITTEXT = atolwhex(EARGF(usage()));
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break;
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case 'D':
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INITDAT = atolwhex(EARGF(usage()));
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break;
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case 'R':
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INITRND = atolwhex(EARGF(usage()));
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break;
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case 'r':
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rpath = EARGF(usage());
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break;
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case 'V':
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print("%cl version %s\n", thechar, getgoversion());
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errorexit();
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} ARGEND
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if(argc != 1)
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usage();
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mywhatsys(); // get goos
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if(HEADTYPE == -1) {
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HEADTYPE = 2;
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if(strcmp(goos, "linux") == 0)
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HEADTYPE = 7;
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else
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if(strcmp(goos, "darwin") == 0)
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HEADTYPE = 6;
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else
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if(strcmp(goos, "freebsd") == 0)
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HEADTYPE = 9;
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else
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if(strcmp(goos, "windows") == 0)
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HEADTYPE = 10;
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else
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if(strcmp(goos, "tiny") == 0)
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HEADTYPE = 11;
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else
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if(strcmp(goos, "plan9") == 0)
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HEADTYPE = 2;
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else
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print("goos is not known: %s\n", goos);
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}
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if(outfile == nil) {
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if(HEADTYPE == 10)
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outfile = "8.out.exe";
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else
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outfile = "8.out";
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}
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libinit();
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if(rpath == nil)
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rpath = smprint("%s/pkg/%s_%s", goroot, goos, goarch);
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switch(HEADTYPE) {
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default:
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diag("unknown -H option");
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errorexit();
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case 0: /* this is garbage */
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HEADR = 20L+56L;
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if(INITTEXT == -1)
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INITTEXT = 0x40004CL;
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if(INITDAT == -1)
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INITDAT = 0x10000000L;
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if(INITRND == -1)
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INITRND = 0;
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break;
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case 1: /* is unix coff */
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HEADR = 0xd0L;
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if(INITTEXT == -1)
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INITTEXT = 0xd0;
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if(INITDAT == -1)
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INITDAT = 0x400000;
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if(INITRND == -1)
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INITRND = 0;
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break;
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case 2: /* plan 9 */
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HEADR = 32L;
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if(INITTEXT == -1)
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INITTEXT = 4096+32;
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if(INITDAT == -1)
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INITDAT = 0;
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if(INITRND == -1)
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INITRND = 1;
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break;
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case 3: /* MS-DOS .COM */
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HEADR = 0;
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if(INITTEXT == -1)
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INITTEXT = 0x0100;
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if(INITDAT == -1)
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INITDAT = 0;
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if(INITRND == -1)
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INITRND = 4;
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break;
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case 4: /* fake MS-DOS .EXE */
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HEADR = 0x200;
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if(INITTEXT == -1)
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INITTEXT = 0x0100;
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if(INITDAT == -1)
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INITDAT = 0;
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if(INITRND == -1)
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INITRND = 4;
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HEADR += (INITTEXT & 0xFFFF);
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if(debug['v'])
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Bprint(&bso, "HEADR = 0x%d\n", HEADR);
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break;
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case 6: /* apple MACH */
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/*
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* OS X system constant - offset from %gs to our TLS.
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* Explained in ../../libcgo/darwin_386.c.
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*/
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tlsoffset = 0x468;
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machoinit();
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HEADR = MACHORESERVE;
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if(INITTEXT == -1)
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INITTEXT = 4096+HEADR;
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if(INITDAT == -1)
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INITDAT = 0;
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if(INITRND == -1)
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INITRND = 4096;
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break;
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case 7: /* elf32 executable */
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case 9:
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/*
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* ELF uses TLS offsets negative from %gs.
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* Translate 0(GS) and 4(GS) into -8(GS) and -4(GS).
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* Also known to ../../pkg/runtime/linux/386/sys.s
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* and ../../libcgo/linux_386.c.
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*/
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tlsoffset = -8;
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elfinit();
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HEADR = ELFRESERVE;
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if(INITTEXT == -1)
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INITTEXT = 0x08048000+HEADR;
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if(INITDAT == -1)
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INITDAT = 0;
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if(INITRND == -1)
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INITRND = 4096;
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break;
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case 10: /* PE executable */
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peinit();
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HEADR = PEFILEHEADR;
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if(INITTEXT == -1)
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INITTEXT = PEBASE+PESECTHEADR;
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if(INITDAT == -1)
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INITDAT = 0;
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if(INITRND == -1)
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INITRND = PESECTALIGN;
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break;
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case 11:
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tlsoffset = 0;
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elfinit();
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HEADR = ELFRESERVE;
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if(INITTEXT == -1)
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INITTEXT = 0x100000+HEADR;
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if(INITDAT == -1)
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INITDAT = 0;
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if(INITRND == -1)
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INITRND = 4096;
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break;
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}
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if(INITDAT != 0 && INITRND != 0)
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print("warning: -D0x%ux is ignored because of -R0x%ux\n",
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INITDAT, INITRND);
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if(debug['v'])
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Bprint(&bso, "HEADER = -H0x%d -T0x%ux -D0x%ux -R0x%ux\n",
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HEADTYPE, INITTEXT, INITDAT, INITRND);
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Bflush(&bso);
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instinit();
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zprg.link = P;
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zprg.pcond = P;
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zprg.back = 2;
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zprg.as = AGOK;
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zprg.from.type = D_NONE;
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zprg.from.index = D_NONE;
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zprg.from.scale = 1;
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zprg.to = zprg.from;
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pcstr = "%.6ux ";
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nuxiinit();
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histgen = 0;
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pc = 0;
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dtype = 4;
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version = 0;
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cbp = buf.cbuf;
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cbc = sizeof(buf.cbuf);
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addlibpath("command line", "command line", argv[0], "main");
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loadlib();
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deadcode();
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patch();
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follow();
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doelf();
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if(HEADTYPE == 6)
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domacho();
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if(HEADTYPE == 10)
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dope();
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dostkoff();
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if(debug['p'])
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if(debug['1'])
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doprof1();
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else
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doprof2();
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span();
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textaddress();
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pclntab();
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symtab();
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dodata();
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address();
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reloc();
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asmb();
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undef();
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if(debug['v']) {
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Bprint(&bso, "%5.2f cpu time\n", cputime());
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Bprint(&bso, "%d symbols\n", nsymbol);
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Bprint(&bso, "%d sizeof adr\n", sizeof(Adr));
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Bprint(&bso, "%d sizeof prog\n", sizeof(Prog));
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}
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Bflush(&bso);
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errorexit();
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}
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static Sym*
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zsym(char *pn, Biobuf *f, Sym *h[])
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{
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int o;
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o = Bgetc(f);
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if(o < 0 || o >= NSYM || h[o] == nil)
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mangle(pn);
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return h[o];
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}
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static void
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zaddr(char *pn, Biobuf *f, Adr *a, Sym *h[])
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{
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int t;
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int32 l;
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Sym *s;
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Auto *u;
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t = Bgetc(f);
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a->index = D_NONE;
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a->scale = 0;
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if(t & T_INDEX) {
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a->index = Bgetc(f);
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a->scale = Bgetc(f);
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}
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a->type = D_NONE;
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a->offset = 0;
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if(t & T_OFFSET)
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a->offset = Bget4(f);
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a->offset2 = 0;
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if(t & T_OFFSET2) {
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a->offset2 = Bget4(f);
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a->type = D_CONST2;
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}
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a->sym = S;
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if(t & T_SYM)
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a->sym = zsym(pn, f, h);
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if(t & T_FCONST) {
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a->ieee.l = Bget4(f);
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a->ieee.h = Bget4(f);
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a->type = D_FCONST;
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} else
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if(t & T_SCONST) {
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Bread(f, a->scon, NSNAME);
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a->type = D_SCONST;
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}
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if(t & T_TYPE)
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a->type = Bgetc(f);
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adrgotype = S;
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if(t & T_GOTYPE)
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adrgotype = zsym(pn, f, h);
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t = a->type;
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if(t == D_INDIR+D_GS)
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a->offset += tlsoffset;
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s = a->sym;
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if(s == S)
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return;
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if(t != D_AUTO && t != D_PARAM) {
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if(adrgotype)
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s->gotype = adrgotype;
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return;
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}
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l = a->offset;
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for(u=curauto; u; u=u->link) {
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if(u->asym == s)
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if(u->type == t) {
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if(u->aoffset > l)
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u->aoffset = l;
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if(adrgotype)
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u->gotype = adrgotype;
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return;
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}
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}
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u = mal(sizeof(*u));
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u->link = curauto;
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curauto = u;
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u->asym = s;
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u->aoffset = l;
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u->type = t;
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u->gotype = adrgotype;
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}
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void
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nopout(Prog *p)
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{
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p->as = ANOP;
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p->from.type = D_NONE;
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p->to.type = D_NONE;
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}
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void
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ldobj1(Biobuf *f, char *pkg, int64 len, char *pn)
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{
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int32 ipc;
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Prog *p;
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int v, o, r, skip;
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Sym *h[NSYM], *s, *di;
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uint32 sig;
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int ntext;
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int32 eof;
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char *name, *x;
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char src[1024];
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Prog *lastp;
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lastp = nil;
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ntext = 0;
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eof = Boffset(f) + len;
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di = S;
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src[0] = 0;
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newloop:
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memset(h, 0, sizeof(h));
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version++;
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histfrogp = 0;
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ipc = pc;
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skip = 0;
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loop:
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if(f->state == Bracteof || Boffset(f) >= eof)
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goto eof;
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o = Bgetc(f);
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if(o == Beof)
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goto eof;
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o |= Bgetc(f) << 8;
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if(o <= AXXX || o >= ALAST) {
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if(o < 0)
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goto eof;
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diag("%s:#%lld: opcode out of range: %#ux", pn, Boffset(f), o);
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print(" probably not a .%c file\n", thechar);
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errorexit();
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}
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if(o == ANAME || o == ASIGNAME) {
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sig = 0;
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if(o == ASIGNAME)
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sig = Bget4(f);
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v = Bgetc(f); /* type */
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o = Bgetc(f); /* sym */
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r = 0;
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if(v == D_STATIC)
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r = version;
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name = Brdline(f, '\0');
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if(name == nil) {
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if(Blinelen(f) > 0) {
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fprint(2, "%s: name too long\n", pn);
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errorexit();
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}
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goto eof;
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}
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x = expandpkg(name, pkg);
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s = lookup(x, r);
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if(x != name)
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free(x);
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name = nil;
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if(debug['S'] && r == 0)
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sig = 1729;
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if(sig != 0){
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if(s->sig != 0 && s->sig != sig)
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diag("incompatible type signatures"
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"%ux(%s) and %ux(%s) for %s",
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s->sig, s->file, sig, pn, s->name);
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s->sig = sig;
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s->file = pn;
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}
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if(debug['W'])
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print(" ANAME %s\n", s->name);
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if(o < 0 || o >= nelem(h))
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mangle(pn);
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h[o] = s;
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if((v == D_EXTERN || v == D_STATIC) && s->type == 0)
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s->type = SXREF;
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if(v == D_FILE) {
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if(s->type != SFILE) {
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histgen++;
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s->type = SFILE;
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s->value = histgen;
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}
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if(histfrogp < MAXHIST) {
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histfrog[histfrogp] = s;
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histfrogp++;
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} else
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collapsefrog(s);
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dwarfaddfrag(s->value, s->name);
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}
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goto loop;
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}
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p = mal(sizeof(*p));
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p->as = o;
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p->line = Bget4(f);
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p->back = 2;
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p->ft = 0;
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p->tt = 0;
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zaddr(pn, f, &p->from, h);
|
|
fromgotype = adrgotype;
|
|
zaddr(pn, f, &p->to, h);
|
|
|
|
if(debug['W'])
|
|
print("%P\n", p);
|
|
|
|
switch(p->as) {
|
|
case AHISTORY:
|
|
if(p->to.offset == -1) {
|
|
addlib(src, pn);
|
|
histfrogp = 0;
|
|
goto loop;
|
|
}
|
|
if(src[0] == '\0')
|
|
copyhistfrog(src, sizeof src);
|
|
addhist(p->line, D_FILE); /* 'z' */
|
|
if(p->to.offset)
|
|
addhist(p->to.offset, D_FILE1); /* 'Z' */
|
|
histfrogp = 0;
|
|
goto loop;
|
|
|
|
case AEND:
|
|
histtoauto();
|
|
if(cursym != nil && cursym->text)
|
|
cursym->autom = curauto;
|
|
curauto = 0;
|
|
cursym = nil;
|
|
if(Boffset(f) == eof)
|
|
return;
|
|
goto newloop;
|
|
|
|
case AGLOBL:
|
|
s = p->from.sym;
|
|
if(s->type == 0 || s->type == SXREF) {
|
|
s->type = SBSS;
|
|
s->size = 0;
|
|
}
|
|
if(s->type != SBSS && !s->dupok) {
|
|
diag("%s: redefinition: %s in %s",
|
|
pn, s->name, TNAME);
|
|
s->type = SBSS;
|
|
s->size = 0;
|
|
}
|
|
if(p->to.offset > s->size)
|
|
s->size = p->to.offset;
|
|
if(p->from.scale & DUPOK)
|
|
s->dupok = 1;
|
|
if(p->from.scale & RODATA)
|
|
s->type = SRODATA;
|
|
goto loop;
|
|
|
|
case ADATA:
|
|
// Assume that AGLOBL comes after ADATA.
|
|
// If we've seen an AGLOBL that said this sym was DUPOK,
|
|
// ignore any more ADATA we see, which must be
|
|
// redefinitions.
|
|
s = p->from.sym;
|
|
if(s->dupok) {
|
|
// if(debug['v'])
|
|
// Bprint(&bso, "skipping %s in %s: dupok\n", s->name, pn);
|
|
goto loop;
|
|
}
|
|
if(s->file == nil)
|
|
s->file = pn;
|
|
else if(s->file != pn) {
|
|
diag("multiple initialization for %s: in both %s and %s", s->name, s->file, pn);
|
|
errorexit();
|
|
}
|
|
savedata(s, p);
|
|
unmal(p, sizeof *p);
|
|
goto loop;
|
|
|
|
case AGOK:
|
|
diag("%s: GOK opcode in %s", pn, TNAME);
|
|
pc++;
|
|
goto loop;
|
|
|
|
case ATEXT:
|
|
s = p->from.sym;
|
|
if(s->text != nil) {
|
|
diag("%s: %s: redefinition", pn, s->name);
|
|
return;
|
|
}
|
|
if(ntext++ == 0 && s->type != 0 && s->type != SXREF) {
|
|
/* redefinition, so file has probably been seen before */
|
|
if(debug['v'])
|
|
diag("skipping: %s: redefinition: %s", pn, s->name);
|
|
return;
|
|
}
|
|
if(cursym != nil && cursym->text) {
|
|
histtoauto();
|
|
cursym->autom = curauto;
|
|
curauto = 0;
|
|
}
|
|
skip = 0;
|
|
if(etextp)
|
|
etextp->next = s;
|
|
else
|
|
textp = s;
|
|
etextp = s;
|
|
s->text = p;
|
|
cursym = s;
|
|
if(s->type != 0 && s->type != SXREF) {
|
|
if(p->from.scale & DUPOK) {
|
|
skip = 1;
|
|
goto casdef;
|
|
}
|
|
diag("%s: redefinition: %s\n%P", pn, s->name, p);
|
|
}
|
|
s->type = STEXT;
|
|
s->value = pc;
|
|
lastp = p;
|
|
p->pc = pc++;
|
|
goto loop;
|
|
|
|
case AFMOVF:
|
|
case AFADDF:
|
|
case AFSUBF:
|
|
case AFSUBRF:
|
|
case AFMULF:
|
|
case AFDIVF:
|
|
case AFDIVRF:
|
|
case AFCOMF:
|
|
case AFCOMFP:
|
|
if(skip)
|
|
goto casdef;
|
|
if(p->from.type == D_FCONST) {
|
|
/* size sb 9 max */
|
|
sprint(literal, "$%ux", ieeedtof(&p->from.ieee));
|
|
s = lookup(literal, 0);
|
|
if(s->type == 0) {
|
|
s->type = SDATA;
|
|
adduint32(s, ieeedtof(&p->from.ieee));
|
|
s->reachable = 0;
|
|
}
|
|
p->from.type = D_EXTERN;
|
|
p->from.sym = s;
|
|
p->from.offset = 0;
|
|
}
|
|
goto casdef;
|
|
|
|
case AFMOVD:
|
|
case AFADDD:
|
|
case AFSUBD:
|
|
case AFSUBRD:
|
|
case AFMULD:
|
|
case AFDIVD:
|
|
case AFDIVRD:
|
|
case AFCOMD:
|
|
case AFCOMDP:
|
|
if(skip)
|
|
goto casdef;
|
|
if(p->from.type == D_FCONST) {
|
|
/* size sb 18 max */
|
|
sprint(literal, "$%ux.%ux",
|
|
p->from.ieee.l, p->from.ieee.h);
|
|
s = lookup(literal, 0);
|
|
if(s->type == 0) {
|
|
s->type = SDATA;
|
|
adduint32(s, p->from.ieee.l);
|
|
adduint32(s, p->from.ieee.h);
|
|
s->reachable = 0;
|
|
}
|
|
p->from.type = D_EXTERN;
|
|
p->from.sym = s;
|
|
p->from.offset = 0;
|
|
}
|
|
goto casdef;
|
|
|
|
casdef:
|
|
default:
|
|
if(skip)
|
|
nopout(p);
|
|
p->pc = pc;
|
|
pc++;
|
|
|
|
if(p->to.type == D_BRANCH)
|
|
p->to.offset += ipc;
|
|
if(lastp == nil) {
|
|
if(p->as != ANOP)
|
|
diag("unexpected instruction: %P", p);
|
|
goto loop;
|
|
}
|
|
lastp->link = p;
|
|
lastp = p;
|
|
goto loop;
|
|
}
|
|
goto loop;
|
|
|
|
eof:
|
|
diag("truncated object file: %s", pn);
|
|
}
|
|
|
|
Prog*
|
|
prg(void)
|
|
{
|
|
Prog *p;
|
|
|
|
p = mal(sizeof(Prog));
|
|
*p = zprg;
|
|
return p;
|
|
}
|
|
|
|
Prog*
|
|
copyp(Prog *q)
|
|
{
|
|
Prog *p;
|
|
|
|
p = prg();
|
|
*p = *q;
|
|
return p;
|
|
}
|
|
|
|
Prog*
|
|
appendp(Prog *q)
|
|
{
|
|
Prog *p;
|
|
|
|
p = prg();
|
|
p->link = q->link;
|
|
q->link = p;
|
|
p->line = q->line;
|
|
return p;
|
|
}
|