mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
046c7ebd4a
- Introduce fast spinlock API - Double rand64() perf w/ spinlock - Improve raise() on New Technology - Support gettid() across platforms - Implement SA_NODEFER on New Technology - Move the lock intrinsics into LIBC_INTRIN - Make SIGTRAP recoverable on New Technology - Block SIGCHLD in wait4() on New Technology - Add threading prototypes for XNU and FreeBSD - Rewrite abort() fixing its minor bugs on XNU/NT - Shave down a lot of the content in libc/bits/bits.h - Let signal handlers modify CPU registers on New Technology
114 lines
4.5 KiB
C
114 lines
4.5 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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│ 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/bits/safemacros.internal.h"
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#include "libc/intrin/cmpxchg.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/rdtsc.h"
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#include "libc/nexgen32e/rdtscp.h"
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#include "libc/nexgen32e/stackframe.h"
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#include "libc/nexgen32e/x86feature.h"
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#include "libc/runtime/memtrack.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.internal.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#pragma weak stderr
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#define MAX_NESTING 512
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/**
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* @fileoverview Plain-text function call logging.
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*
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* Able to log ~2 million function calls per second, which is mostly
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* bottlenecked by system call overhead. Log size is reasonable if piped
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* into gzip.
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*/
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void ftrace_hook(void);
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bool ftrace_enabled;
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static int g_skew;
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static int g_lastsymbol;
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static uint64_t laststamp;
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static struct SymbolTable *g_symbols;
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static privileged noinstrument noasan noubsan int GetNestingLevelImpl(
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struct StackFrame *frame) {
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int nesting = -2;
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while (frame) {
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++nesting;
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frame = frame->next;
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}
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return MAX(0, nesting);
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}
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static privileged noinstrument noasan noubsan int GetNestingLevel(
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struct StackFrame *frame) {
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int nesting;
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nesting = GetNestingLevelImpl(frame);
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if (nesting < g_skew) g_skew = nesting;
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nesting -= g_skew;
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return MIN(MAX_NESTING, nesting);
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}
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/**
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* Prints name of function being called.
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*
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* We insert CALL instructions that point to this function, in the
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* prologues of other functions. We assume those functions behave
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* according to the System Five NexGen32e ABI.
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*/
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privileged noinstrument noasan noubsan void ftracer(void) {
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/* asan runtime depends on this function */
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int symbol;
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uint64_t stamp;
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static bool noreentry;
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struct StackFrame *frame;
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if (!_cmpxchg(&noreentry, 0, 1)) return;
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if (ftrace_enabled && g_symbols) {
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stamp = rdtsc();
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frame = __builtin_frame_address(0);
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frame = frame->next;
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if ((symbol = __get_symbol(g_symbols, frame->addr)) != -1 &&
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symbol != g_lastsymbol) {
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g_lastsymbol = symbol;
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kprintf("+ %*s%s %d\r\n", GetNestingLevel(frame) * 2, "",
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__get_symbol_name(g_symbols, symbol),
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(long)(unsignedsubtract(stamp, laststamp) / 3.3));
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laststamp = X86_HAVE(RDTSCP) ? rdtscp(0) : rdtsc();
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}
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}
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noreentry = 0;
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}
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textstartup void ftrace_install(void) {
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if ((g_symbols = GetSymbolTable())) {
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laststamp = kStartTsc;
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g_lastsymbol = -1;
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g_skew = GetNestingLevelImpl(__builtin_frame_address(0));
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ftrace_enabled = 1;
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__hook(ftrace_hook, g_symbols);
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} else {
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kprintf("error: --ftrace failed to open symbol table\r\n");
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}
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}
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