mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
a359de7893
This changes *NSYNC to allocate waiters on the stack so our locks don't need to depend on dynamic memory. This make our runtiem simpler, and it also fixes bugs with thread cancellation support.
301 lines
9.8 KiB
C
301 lines
9.8 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 │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/assert.h"
|
|
#include "libc/atomic.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/state.internal.h"
|
|
#include "libc/calls/struct/sigaction.h"
|
|
#include "libc/calls/struct/sigset.h"
|
|
#include "libc/calls/struct/utsname.h"
|
|
#include "libc/calls/syscall-sysv.internal.h"
|
|
#include "libc/calls/ucontext.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/fmt/itoa.h"
|
|
#include "libc/intrin/asan.internal.h"
|
|
#include "libc/intrin/atomic.h"
|
|
#include "libc/intrin/describebacktrace.internal.h"
|
|
#include "libc/intrin/describeflags.internal.h"
|
|
#include "libc/intrin/kprintf.h"
|
|
#include "libc/intrin/strace.internal.h"
|
|
#include "libc/intrin/weaken.h"
|
|
#include "libc/log/backtrace.internal.h"
|
|
#include "libc/log/gdb.h"
|
|
#include "libc/log/internal.h"
|
|
#include "libc/log/log.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/math.h"
|
|
#include "libc/nexgen32e/stackframe.h"
|
|
#include "libc/runtime/internal.h"
|
|
#include "libc/runtime/pc.internal.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/stdio/stdio.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/consts/auxv.h"
|
|
#include "libc/sysv/consts/sig.h"
|
|
#include "libc/thread/thread.h"
|
|
#include "libc/thread/tls.h"
|
|
#ifdef __x86_64__
|
|
|
|
__static_yoink("strerror_wr"); // for kprintf %m
|
|
__static_yoink("strsignal_r"); // for kprintf %G
|
|
|
|
static const char kGregOrder[17] forcealign(1) = {
|
|
13, 11, 8, 14, 12, 9, 10, 15, 16, 0, 1, 2, 3, 4, 5, 6, 7,
|
|
};
|
|
|
|
static const char kGregNames[17][4] forcealign(1) = {
|
|
"R8", "R9", "R10", "R11", "R12", "R13", "R14", "R15", "RDI",
|
|
"RSI", "RBP", "RBX", "RDX", "RAX", "RCX", "RSP", "RIP",
|
|
};
|
|
|
|
static const char kCpuFlags[12] forcealign(1) = "CVPRAKZSTIDO";
|
|
static const char kFpuExceptions[6] forcealign(1) = "IDZOUP";
|
|
|
|
relegated static void ShowFunctionCalls(ucontext_t *ctx) {
|
|
struct StackFrame *bp;
|
|
struct StackFrame goodframe;
|
|
if (!ctx->uc_mcontext.rip) {
|
|
kprintf("%s is NULL can't show backtrace\n", "RIP");
|
|
} else {
|
|
goodframe.next = (struct StackFrame *)ctx->uc_mcontext.rbp;
|
|
goodframe.addr = ctx->uc_mcontext.rip;
|
|
bp = &goodframe;
|
|
ShowBacktrace(2, bp);
|
|
}
|
|
}
|
|
|
|
relegated static char *AddFlag(char *p, int b, const char *s) {
|
|
if (b) {
|
|
p = stpcpy(p, s);
|
|
} else {
|
|
*p = 0;
|
|
}
|
|
return p;
|
|
}
|
|
|
|
relegated static char *DescribeCpuFlags(char *p, int flags, int x87sw,
|
|
int mxcsr) {
|
|
unsigned i;
|
|
for (i = 0; i < ARRAYLEN(kCpuFlags); ++i) {
|
|
if (flags & 1) {
|
|
*p++ = ' ';
|
|
*p++ = kCpuFlags[i];
|
|
*p++ = 'F';
|
|
}
|
|
flags >>= 1;
|
|
}
|
|
for (i = 0; i < ARRAYLEN(kFpuExceptions); ++i) {
|
|
if ((x87sw | mxcsr) & (1 << i)) {
|
|
*p++ = ' ';
|
|
*p++ = kFpuExceptions[i];
|
|
*p++ = 'E';
|
|
}
|
|
}
|
|
p = AddFlag(p, x87sw & FPU_SF, " SF");
|
|
p = AddFlag(p, x87sw & FPU_C0, " C0");
|
|
p = AddFlag(p, x87sw & FPU_C1, " C1");
|
|
p = AddFlag(p, x87sw & FPU_C2, " C2");
|
|
p = AddFlag(p, x87sw & FPU_C3, " C3");
|
|
return p;
|
|
}
|
|
|
|
static char *HexCpy(char p[hasatleast 17], uint64_t x, uint8_t k) {
|
|
while (k > 0) *p++ = "0123456789abcdef"[(x >> (k -= 4)) & 15];
|
|
*p = '\0';
|
|
return p;
|
|
}
|
|
|
|
relegated static char *ShowGeneralRegisters(char *p, ucontext_t *ctx) {
|
|
int64_t x;
|
|
const char *s;
|
|
size_t i, j, k;
|
|
long double st;
|
|
*p++ = '\n';
|
|
for (i = 0, j = 0, k = 0; i < ARRAYLEN(kGregNames); ++i) {
|
|
if (j > 0) *p++ = ' ';
|
|
if (!(s = kGregNames[(unsigned)kGregOrder[i]])[2]) *p++ = ' ';
|
|
p = stpcpy(p, s), *p++ = ' ';
|
|
p = HexCpy(p, ctx->uc_mcontext.gregs[(unsigned)kGregOrder[i]], 64);
|
|
if (++j == 3) {
|
|
j = 0;
|
|
if (ctx->uc_mcontext.fpregs) {
|
|
memcpy(&st, (char *)&ctx->uc_mcontext.fpregs->st[k], sizeof(st));
|
|
p = stpcpy(p, " ST(");
|
|
p = FormatUint64(p, k++);
|
|
p = stpcpy(p, ") ");
|
|
if (signbit(st)) {
|
|
st = -st;
|
|
*p++ = '-';
|
|
}
|
|
if (isnan(st)) {
|
|
p = stpcpy(p, "nan");
|
|
} else if (isinf(st)) {
|
|
p = stpcpy(p, "inf");
|
|
} else {
|
|
if (st > 999.999) st = 999.999;
|
|
x = st * 1000;
|
|
p = FormatUint64(p, x / 1000), *p++ = '.';
|
|
p = FormatUint64(p, x % 1000);
|
|
}
|
|
}
|
|
*p++ = '\n';
|
|
}
|
|
}
|
|
DescribeCpuFlags(
|
|
p, ctx->uc_mcontext.eflags,
|
|
ctx->uc_mcontext.fpregs ? ctx->uc_mcontext.fpregs->swd : 0,
|
|
ctx->uc_mcontext.fpregs ? ctx->uc_mcontext.fpregs->mxcsr : 0);
|
|
*p++ = '\n';
|
|
return p;
|
|
}
|
|
|
|
relegated static char *ShowSseRegisters(char *p, ucontext_t *ctx) {
|
|
size_t i;
|
|
if (ctx->uc_mcontext.fpregs) {
|
|
*p++ = '\n';
|
|
for (i = 0; i < 8; ++i) {
|
|
*p++ = 'X';
|
|
*p++ = 'M';
|
|
*p++ = 'M';
|
|
if (i >= 10) {
|
|
*p++ = i / 10 + '0';
|
|
*p++ = i % 10 + '0';
|
|
} else {
|
|
*p++ = i + '0';
|
|
*p++ = ' ';
|
|
}
|
|
*p++ = ' ';
|
|
p = HexCpy(p, ctx->uc_mcontext.fpregs->xmm[i + 0].u64[1], 64);
|
|
p = HexCpy(p, ctx->uc_mcontext.fpregs->xmm[i + 0].u64[0], 64);
|
|
p = stpcpy(p, " XMM");
|
|
if (i + 8 >= 10) {
|
|
*p++ = (i + 8) / 10 + '0';
|
|
*p++ = (i + 8) % 10 + '0';
|
|
} else {
|
|
*p++ = (i + 8) + '0';
|
|
*p++ = ' ';
|
|
}
|
|
*p++ = ' ';
|
|
p = HexCpy(p, ctx->uc_mcontext.fpregs->xmm[i + 8].u64[1], 64);
|
|
p = HexCpy(p, ctx->uc_mcontext.fpregs->xmm[i + 8].u64[0], 64);
|
|
*p++ = '\n';
|
|
}
|
|
}
|
|
return p;
|
|
}
|
|
|
|
void ShowCrashReportHook(int, int, int, struct siginfo *, ucontext_t *);
|
|
|
|
relegated void ShowCrashReport(int err, int sig, struct siginfo *si,
|
|
ucontext_t *ctx) {
|
|
int i;
|
|
char *p;
|
|
char host[64];
|
|
char buf[3000];
|
|
struct utsname names;
|
|
if (_weaken(ShowCrashReportHook)) {
|
|
ShowCrashReportHook(2, err, sig, si, ctx);
|
|
}
|
|
names.sysname[0] = 0;
|
|
names.release[0] = 0;
|
|
names.version[0] = 0;
|
|
names.nodename[0] = 0;
|
|
stpcpy(host, "unknown");
|
|
gethostname(host, sizeof(host));
|
|
uname(&names);
|
|
errno = err;
|
|
// TODO(jart): Buffer the WHOLE crash report with backtrace for atomic write.
|
|
p = buf;
|
|
p += ksnprintf(
|
|
p, 10000,
|
|
"\n%serror%s: Uncaught %G (%s) on %s pid %d tid %d\n"
|
|
" %s\n"
|
|
" %s\n"
|
|
" %s %s %s %s\n",
|
|
!__nocolor ? "\e[30;101m" : "", !__nocolor ? "\e[0m" : "", sig,
|
|
(ctx &&
|
|
(ctx->uc_mcontext.rsp >= GetStaticStackAddr(0) &&
|
|
ctx->uc_mcontext.rsp <= GetStaticStackAddr(0) + getauxval(AT_PAGESZ)))
|
|
? "Stack Overflow"
|
|
: DescribeSiCode(sig, si->si_code),
|
|
host, getpid(), gettid(), program_invocation_name, strerror(err),
|
|
names.sysname, names.version, names.nodename, names.release);
|
|
if (ctx) {
|
|
p = ShowGeneralRegisters(p, ctx);
|
|
p = ShowSseRegisters(p, ctx);
|
|
*p++ = '\n';
|
|
klog(buf, p - buf);
|
|
ShowFunctionCalls(ctx);
|
|
} else {
|
|
*p++ = '\n';
|
|
klog(buf, p - buf);
|
|
}
|
|
kprintf("\n");
|
|
if (!IsWindows()) __print_maps();
|
|
/* PrintSystemMappings(2); */
|
|
if (__argv) {
|
|
for (i = 0; i < __argc; ++i) {
|
|
if (!__argv[i]) continue;
|
|
if (IsAsan() && !__asan_is_valid_str(__argv[i])) continue;
|
|
kprintf("%s ", __argv[i]);
|
|
}
|
|
}
|
|
kprintf("\n");
|
|
}
|
|
|
|
static relegated wontreturn void RaiseCrash(int sig) {
|
|
sigset_t ss;
|
|
sigfillset(&ss);
|
|
sigdelset(&ss, sig);
|
|
sigprocmask(SIG_SETMASK, &ss, 0);
|
|
signal(sig, SIG_DFL);
|
|
kill(getpid(), sig);
|
|
_Exit(128 + sig);
|
|
}
|
|
|
|
relegated void __oncrash_amd64(int sig, struct siginfo *si, void *arg) {
|
|
int gdbpid, err;
|
|
ucontext_t *ctx = arg;
|
|
|
|
// print vital error nubers reliably
|
|
// the surface are of code this calls is small and audited
|
|
kprintf(
|
|
"\r\n\e[1;31m__oncrash %G %s pid %d tid %d rip %x bt %s\e[0m\n", sig,
|
|
program_invocation_short_name, getpid(), sys_gettid(),
|
|
ctx ? ctx->uc_mcontext.rip : 0,
|
|
DescribeBacktrace(ctx ? (struct StackFrame *)ctx->uc_mcontext.rbp
|
|
: (struct StackFrame *)__builtin_frame_address(0)));
|
|
|
|
// print friendlier detailed crash report less reliably
|
|
// we're in a broken runtime state and so much can go wrong
|
|
ftrace_enabled(-1);
|
|
strace_enabled(-1);
|
|
err = errno;
|
|
if ((gdbpid = IsDebuggerPresent(true))) {
|
|
DebugBreak();
|
|
}
|
|
if (!(gdbpid > 0 && (sig == SIGTRAP || sig == SIGQUIT))) {
|
|
__restore_tty();
|
|
ShowCrashReport(err, sig, si, ctx);
|
|
RaiseCrash(sig);
|
|
}
|
|
}
|
|
|
|
#endif /* __x86_64__ */
|