mirror of
https://github.com/jart/cosmopolitan.git
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daf4454a06
- Work towards improving non-optimized build support - Introduce MODE=zero which is -O0 without ASAN/UBSAN - Use system GCC when ~/.cosmo.mk has USE_SYSTEM_TOOLCHAIN=1 - Have package.com check .privileged code doesn't call non-privileged
56 lines
2.7 KiB
C
56 lines
2.7 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 2023 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.internal.h"
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extern _Hide struct SymbolTable *__symtab;
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/**
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* Returns low index into symbol table for address.
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*
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* @param t if null will be auto-populated only if already open
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* @return index or -1 if nothing found
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*/
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noinstrument privileged int __get_symbol(struct SymbolTable *t, intptr_t a) {
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// we need privileged because:
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// kprintf is privileged and it depends on this
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// we don't want function tracing because:
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// function tracing depends on this function via kprintf
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unsigned l, m, r, n, k;
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if (!t && __symtab) {
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t = __symtab;
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}
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if (t) {
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l = 0;
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r = n = t->count;
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k = a - t->addr_base;
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while (l < r) {
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m = (l + r) >> 1;
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if (t->symbols[m].y < k) {
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l = m + 1;
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} else {
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r = m;
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}
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}
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if (l < n && t->symbols[l].x <= k && k <= t->symbols[l].y) {
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return l;
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}
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}
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return -1;
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}
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