144 lines
5.4 KiB
C
144 lines
5.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program is distributed in the hope that it will be useful, but │
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/alg/bisectcarleft.h"
|
|
#include "libc/bits/bits.h"
|
|
#include "libc/bits/safemacros.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/calls/struct/sigset.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/repmovsb.h"
|
|
#include "libc/macros.h"
|
|
#include "libc/nexgen32e/stackframe.h"
|
|
#include "libc/nt/files.h"
|
|
#include "libc/nt/runtime.h"
|
|
#include "libc/nt/thunk/msabi.h"
|
|
#include "libc/runtime/internal.h"
|
|
#include "libc/runtime/missioncritical.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/runtime/symbols.h"
|
|
#include "libc/sysv/consts/fileno.h"
|
|
#include "libc/sysv/consts/nr.h"
|
|
#include "libc/sysv/consts/prot.h"
|
|
#include "libc/sysv/consts/sig.h"
|
|
|
|
/**
|
|
* @fileoverview Plain-text function call logging.
|
|
*
|
|
* Able to log ~2 million function calls per second, which is mostly
|
|
* bottlenecked by system call overhead. Log size is reasonable if piped
|
|
* into gzip.
|
|
*/
|
|
|
|
static char g_buf[512];
|
|
static const char *g_lastsymbol;
|
|
static struct SymbolTable *g_symbols;
|
|
|
|
forceinline int GetNestingLevel(struct StackFrame *frame) {
|
|
int nesting = -2;
|
|
while (frame) {
|
|
++nesting;
|
|
frame = frame->next;
|
|
}
|
|
return max(0, nesting);
|
|
}
|
|
|
|
/**
|
|
* Prints name of function being called.
|
|
*
|
|
* We insert CALL instructions that point to this function, in the
|
|
* prologues of other functions. We assume those functions behave
|
|
* according to the System Five NexGen32e ABI.
|
|
*/
|
|
privileged interruptfn void ftrace_hook(void) {
|
|
size_t i, j, nesting;
|
|
const char *symbol;
|
|
struct StackFrame *frame;
|
|
LOAD_DEFAULT_RBX();
|
|
if (g_symbols) {
|
|
frame = __builtin_frame_address(0);
|
|
symbol =
|
|
&g_symbols->name_base[g_symbols
|
|
->symbols[bisectcarleft(
|
|
(const int32_t(*)[2])g_symbols->symbols,
|
|
g_symbols->count,
|
|
frame->addr - g_symbols->addr_base)]
|
|
.name_rva];
|
|
if (symbol != g_lastsymbol &&
|
|
(nesting = GetNestingLevel(frame)) * 2 < ARRAYLEN(g_buf) - 4) {
|
|
i = 2;
|
|
j = 0;
|
|
while (nesting--) {
|
|
g_buf[i++] = ' ';
|
|
g_buf[i++] = ' ';
|
|
}
|
|
while (i < ARRAYLEN(g_buf) - 2 && symbol[j]) {
|
|
g_buf[i++] = symbol[j++];
|
|
}
|
|
g_buf[i++] = '\r';
|
|
g_buf[i++] = '\n';
|
|
__print(g_buf, i);
|
|
}
|
|
g_lastsymbol = symbol;
|
|
}
|
|
RESTORE_RBX();
|
|
}
|
|
|
|
/**
|
|
* Enables plaintext function tracing if --ftrace flag passed.
|
|
*
|
|
* The --ftrace CLI arg is removed before main() is called. This
|
|
* code is intended for diagnostic purposes and assumes binaries
|
|
* are trustworthy and stack isn't corrupted. Logging plain text
|
|
* allows program structure to easily be visualized and hotspots
|
|
* identified w/ sed | sort | uniq -c | sort. A compressed trace
|
|
* can be made by appending --ftrace 2>&1 | gzip -4 >trace.gz to
|
|
* the CLI arguments. Have fun.
|
|
*
|
|
* @see libc/runtime/_init.S for documentation
|
|
*/
|
|
textstartup int ftrace_init(int argc, char *argv[]) {
|
|
int i;
|
|
bool foundflag;
|
|
foundflag = false;
|
|
for (i = 1; i <= argc; ++i) {
|
|
if (!foundflag) {
|
|
if (argv[i]) {
|
|
if (strcmp(argv[i], "--ftrace") == 0) {
|
|
foundflag = true;
|
|
} else if (strcmp(argv[i], "----ftrace") == 0) {
|
|
strcpy(argv[i], "--ftrace");
|
|
}
|
|
}
|
|
} else {
|
|
argv[i - 1] = argv[i];
|
|
}
|
|
}
|
|
if (foundflag) {
|
|
--argc;
|
|
g_buf[0] = '+';
|
|
g_buf[1] = ' ';
|
|
if ((g_symbols = OpenSymbolTable(FindDebugBinary()))) {
|
|
__hook(ftrace_hook, g_symbols);
|
|
}
|
|
}
|
|
return argc;
|
|
}
|