mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-03-03 23:48:21 +00:00
117 lines
4.6 KiB
C
117 lines
4.6 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/alg/bisectcarleft.internal.h"
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#include "libc/bits/bits.h"
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#include "libc/bits/safemacros.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/dce.h"
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#include "libc/intrin/repmovsb.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/stackframe.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/runtime/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/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/consts/sig.h"
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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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static int noreentry;
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static char g_buf[512];
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static const char *g_lastsymbol;
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static struct SymbolTable *g_symbols;
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static noasan int GetNestingLevel(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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/**
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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 noasan void ftrace(void) {
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size_t i, j, nesting;
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const char *symbol;
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struct StackFrame *frame;
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if (!cmpxchg(&noreentry, 0, 1)) return;
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if (g_symbols) {
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frame = __builtin_frame_address(0);
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frame = frame->next;
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symbol =
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&g_symbols->name_base[g_symbols
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->symbols[bisectcarleft(
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(const int32_t(*)[2])g_symbols->symbols,
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g_symbols->count,
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frame->addr - g_symbols->addr_base)]
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.name_rva];
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if (symbol != g_lastsymbol &&
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(nesting = GetNestingLevel(frame)) * 2 < ARRAYLEN(g_buf) - 4) {
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i = 2;
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j = 0;
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while (nesting--) {
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asm volatile("" : : : "memory");
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g_buf[i++] = ' ';
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g_buf[i++] = ' ';
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}
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while (i < ARRAYLEN(g_buf) - 2 && symbol[j]) {
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asm volatile("" : : : "memory");
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g_buf[i++] = symbol[j++];
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}
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g_buf[i++] = '\r';
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g_buf[i++] = '\n';
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write(2, g_buf, i);
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}
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g_lastsymbol = symbol;
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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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g_buf[0] = '+';
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g_buf[1] = ' ';
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if ((g_symbols = OpenSymbolTable(FindDebugBinary()))) {
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__hook(ftrace_hook, g_symbols);
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} else {
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write(2, "error: --ftrace needs the concomitant .com.dbg binary\n", 54);
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}
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}
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