77 lines
3.4 KiB
C
77 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/log/check.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/gc.h"
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#include "libc/str/str.h"
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#include "tool/build/lib/endian.h"
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#include "tool/build/lib/machine.h"
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#include "tool/build/lib/memory.h"
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#define STACKALIGN 16
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#define LINUX_AT_EXECFN 31
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static size_t GetArgListLen(char **p) {
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size_t n;
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for (n = 0; *p; ++p) ++n;
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return n;
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}
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static int64_t PushString(struct Machine *m, const char *s) {
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size_t n;
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int64_t sp;
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n = strlen(s) + 1;
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sp = Read64(m->sp);
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sp -= n;
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Write64(m->sp, sp);
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VirtualRecv(m, sp, s, n);
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return sp;
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}
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void LoadArgv(struct Machine *m, const char *prog, char **args, char **vars) {
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int64_t i, n, sp, *p, *bloc;
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size_t narg, nenv, naux, nall;
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DCHECK_NOTNULL(prog);
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DCHECK_NOTNULL(args);
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DCHECK_NOTNULL(vars);
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naux = 1;
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nenv = GetArgListLen(vars);
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narg = GetArgListLen(args);
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nall = 1 + 1 + narg + 1 + nenv + 1 + (naux + 1) * 2;
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bloc = gc(malloc(sizeof(int64_t) * nall));
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p = bloc + nall;
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*--p = 0;
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*--p = 0;
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*--p = PushString(m, prog);
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*--p = LINUX_AT_EXECFN;
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for (*--p = 0, i = nenv; i--;) *--p = PushString(m, vars[i]);
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for (*--p = 0, i = narg; i--;) *--p = PushString(m, args[i]);
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*--p = PushString(m, prog);
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*--p = 1 + narg;
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DCHECK_EQ(bloc, p);
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sp = Read64(m->sp);
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while ((sp - nall * sizeof(int64_t)) & (STACKALIGN - 1)) --sp;
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sp -= nall * sizeof(int64_t);
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DCHECK_EQ(0, sp % STACKALIGN);
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Write64(m->sp, sp);
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Write64(m->di, 0); /* or ape detects freebsd */
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VirtualRecv(m, sp, bloc, sizeof(int64_t) * nall);
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}
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