mirror of
https://github.com/jart/cosmopolitan.git
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155b378a39
The organization of the source files is now much more rational. Old experiments that didn't work out are now deleted. Naming of things like files is now more intuitive.
107 lines
4.2 KiB
C
107 lines
4.2 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/calls/calls.h"
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#include "libc/errno.h"
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#include "libc/fmt/itoa.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/intrin/nopl.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/runtime/internal.h"
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#include "libc/runtime/stack.h"
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#include "libc/runtime/symbols.internal.h"
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#include "libc/thread/tls.h"
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#include "libc/thread/tls2.h"
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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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static int g_stackdigs;
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static struct CosmoFtrace g_ftrace;
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static privileged inline int GetNestingLevelImpl(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 inline int GetNestingLevel(struct CosmoFtrace *ft,
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struct StackFrame *sf) {
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int nesting;
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nesting = GetNestingLevelImpl(sf);
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if (nesting < ft->ft_skew) ft->ft_skew = nesting;
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nesting -= ft->ft_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 void ftracer(void) {
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long stackuse;
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struct CosmoFtrace *ft;
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struct StackFrame *sf;
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if (__tls_enabled) {
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ft = &__get_tls_privileged()->tib_ftrace;
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} else {
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ft = &g_ftrace;
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}
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if (_cmpxchg(&ft->ft_once, false, true)) {
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ft->ft_lastaddr = -1;
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ft->ft_skew = GetNestingLevelImpl(__builtin_frame_address(0));
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}
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if (_cmpxchg(&ft->ft_noreentry, false, true)) {
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sf = __builtin_frame_address(0);
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sf = sf->next;
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if (sf->addr != ft->ft_lastaddr) {
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stackuse = GetStackAddr() + GetStackSize() - (intptr_t)sf;
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kprintf("%rFUN %6P %'13T %'*ld %*s%t\n", g_stackdigs, stackuse,
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GetNestingLevel(ft, sf) * 2, "", sf->addr);
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ft->ft_lastaddr = sf->addr;
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}
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ft->ft_noreentry = false;
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}
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}
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textstartup int ftrace_install(void) {
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if (GetSymbolTable()) {
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g_stackdigs = LengthInt64Thousands(GetStackSize());
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return __hook(ftrace_hook, GetSymbolTable());
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} else {
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kprintf("error: --ftrace failed to open symbol table\n");
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return -1;
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}
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}
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