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https://github.com/jart/cosmopolitan.git
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dc0ea6640e
This change makes further effort towards improving our poll() implementation on the New Technology. The stdin worker didn't work out so well for Python so it's not being used for now. System call tracing with the --strace flag should now be less noisy now on Windows unless you modify the strace.internal.h defines to turn on some optional ones that are most useful for debugging the system call wrappers.
110 lines
4.3 KiB
C
110 lines
4.3 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 int64_t g_lastaddr;
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static uint64_t g_laststamp;
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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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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) {
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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 (frame->addr != g_lastaddr) {
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kprintf("+ %*s%t %d\r\n", GetNestingLevel(frame) * 2, "", frame->addr,
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(long)(unsignedsubtract(stamp, g_laststamp) / 3.3));
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g_laststamp = X86_HAVE(RDTSCP) ? rdtscp(0) : rdtsc();
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g_lastaddr = frame->addr;
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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 (GetSymbolTable()) {
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g_lastaddr = -1;
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g_laststamp = kStartTsc;
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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, GetSymbolTable());
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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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