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Fix bugs with recent change

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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.
This commit is contained in:
Justine Tunney 2022-04-16 10:40:23 -07:00
parent 933411ba99
commit dc0ea6640e
127 changed files with 1354 additions and 866 deletions
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28
libc/runtime/ftracer.c
View file

@ -48,9 +48,8 @@ void ftrace_hook(void);
bool ftrace_enabled;
static int g_skew;
static int g_lastsymbol;
static uint64_t laststamp;
static struct SymbolTable *g_symbols;
static int64_t g_lastaddr;
static uint64_t g_laststamp;
static privileged noinstrument noasan noubsan int GetNestingLevelImpl(
struct StackFrame *frame) {
@ -80,34 +79,31 @@ static privileged noinstrument noasan noubsan int GetNestingLevel(
*/
privileged noinstrument noasan noubsan void ftracer(void) {
/* asan runtime depends on this function */
int symbol;
uint64_t stamp;
static bool noreentry;
struct StackFrame *frame;
if (!_cmpxchg(&noreentry, 0, 1)) return;
if (ftrace_enabled && g_symbols) {
if (ftrace_enabled) {
stamp = rdtsc();
frame = __builtin_frame_address(0);
frame = frame->next;
if ((symbol = __get_symbol(g_symbols, frame->addr)) != -1 &&
symbol != g_lastsymbol) {
g_lastsymbol = symbol;
kprintf("+ %*s%s %d\r\n", GetNestingLevel(frame) * 2, "",
__get_symbol_name(g_symbols, symbol),
(long)(unsignedsubtract(stamp, laststamp) / 3.3));
laststamp = X86_HAVE(RDTSCP) ? rdtscp(0) : rdtsc();
if (frame->addr != g_lastaddr) {
kprintf("+ %*s%t %d\r\n", GetNestingLevel(frame) * 2, "", frame->addr,
(long)(unsignedsubtract(stamp, g_laststamp) / 3.3));
g_laststamp = X86_HAVE(RDTSCP) ? rdtscp(0) : rdtsc();
g_lastaddr = frame->addr;
}
}
noreentry = 0;
}
textstartup void ftrace_install(void) {
if ((g_symbols = GetSymbolTable())) {
laststamp = kStartTsc;
g_lastsymbol = -1;
if (GetSymbolTable()) {
g_lastaddr = -1;
g_laststamp = kStartTsc;
g_skew = GetNestingLevelImpl(__builtin_frame_address(0));
ftrace_enabled = 1;
__hook(ftrace_hook, g_symbols);
__hook(ftrace_hook, GetSymbolTable());
} else {
kprintf("error: --ftrace failed to open symbol table\r\n");
}