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https://github.com/jart/cosmopolitan.git
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69f4152f38
We had previously not enabled TLS in MODE=tiny in order to keep the smallest example programs (e.g. life.com) just 16kb in size. But it was error prone doing that, so now we just always enable it because this change uses hacks to ensure it won't increase life.com's size. This change also fixes a bug on NetBSD, where signal handlers would break thread local storage if SA_SIGINFO was being used. This looks like it might be a bug in NetBSD, but it's got a simple workaround.
102 lines
4.1 KiB
C
102 lines
4.1 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/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/gettls.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/thread.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 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 FtraceTls *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->skew) ft->skew = nesting;
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nesting -= 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 FtraceTls *ft;
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struct StackFrame *sf;
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ft = (struct FtraceTls *)(__get_tls_privileged() + 0x08);
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if (_cmpxchg(&ft->once, false, true)) {
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ft->lastaddr = -1;
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ft->skew = GetNestingLevelImpl(__builtin_frame_address(0));
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}
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if (_cmpxchg(&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->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->lastaddr = sf->addr;
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}
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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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