mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-03-03 07:29:23 +00:00
Remove some legacy cruft
Function trace logs will report stack usage accurately. It won't include the argv/environ block. Our clone() polyfill is now simpler and does not use as much stack memory. Function call tracing on x86 is now faster too
This commit is contained in:
Justine Tunney
parent
8db646f6b2
commit
a15958edc6
21 changed files with 291 additions and 467 deletions
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@ -254,7 +254,7 @@ static bool elf_slurp(struct Loaded *l, int fd, const char *file) {
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return true;
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}
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static dontinline bool elf_load(struct Loaded *l, const char *file, long pagesz,
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dontinline static bool elf_load(struct Loaded *l, const char *file, long pagesz,
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char *interp_path, size_t interp_size) {
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int fd;
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if ((fd = open(file, O_RDONLY | O_CLOEXEC)) == -1)
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@ -280,7 +280,7 @@ static long *push_strs(long *sp, char **list, int count) {
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return sp;
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}
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static wontreturn dontinstrument void foreign_helper(void **p) {
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wontreturn dontinstrument static void foreign_helper(void **p) {
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__foreign.dlopen = p[0];
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__foreign.dlsym = p[1];
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__foreign.dlclose = p[2];
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@ -288,7 +288,7 @@ static wontreturn dontinstrument void foreign_helper(void **p) {
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_longjmp(__foreign.jb, 1);
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}
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static dontinline void elf_exec(const char *file, char **envp) {
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dontinline static void elf_exec(const char *file, char **envp) {
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// get microprocessor page size
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long pagesz = __pagesize;
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@ -412,7 +412,7 @@ static char *dlerror_set(const char *str) {
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return dlerror_buf;
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}
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static dontinline char *foreign_alloc_block(void) {
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dontinline static char *foreign_alloc_block(void) {
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char *p = 0;
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size_t sz = 65536;
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if (!IsWindows()) {
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@ -435,7 +435,7 @@ static dontinline char *foreign_alloc_block(void) {
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return p;
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}
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static dontinline void *foreign_alloc(size_t n) {
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dontinline static void *foreign_alloc(size_t n) {
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void *res;
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static char *block;
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__dlopen_lock();
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@ -548,7 +548,7 @@ static void *foreign_thunk_nt(void *func) {
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return code;
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}
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static dontinline bool foreign_compile(char exe[hasatleast PATH_MAX]) {
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dontinline static bool foreign_compile(char exe[hasatleast PATH_MAX]) {
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// construct path
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strlcpy(exe, get_tmp_dir(), PATH_MAX);
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@ -49,6 +49,6 @@
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int __vcscanf(int (*)(void *), int (*)(int, void *), void *, const char *,
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va_list);
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int __fmt(void *, void *, const char *, va_list, int *);
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__msabi char16_t *__itoa16(char16_t[21], uint64_t);
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char16_t *__itoa16(char16_t[21], uint64_t) __msabi;
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#endif /* COSMOPOLITAN_LIBC_FMT_STRTOL_H_ */
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@ -89,14 +89,14 @@ __msabi extern typeof(WriteFile) *const __imp_WriteFile;
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extern pthread_mutex_t __sig_worker_lock;
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HAIRY static bool __sig_ignored_by_default(int sig) {
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textwindows static bool __sig_ignored_by_default(int sig) {
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return sig == SIGURG || //
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sig == SIGCONT || //
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sig == SIGCHLD || //
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sig == SIGWINCH;
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}
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HAIRY bool __sig_ignored(int sig) {
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textwindows bool __sig_ignored(int sig) {
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return __sighandrvas[sig] == (intptr_t)SIG_IGN ||
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(__sighandrvas[sig] == (intptr_t)SIG_DFL &&
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__sig_ignored_by_default(sig));
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@ -532,14 +532,14 @@ textwindows void __sig_generate(int sig, int sic) {
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}
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}
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HAIRY static char *__sig_stpcpy(char *d, const char *s) {
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textwindows static char *__sig_stpcpy(char *d, const char *s) {
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size_t i;
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for (i = 0;; ++i)
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if (!(d[i] = s[i]))
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return d + i;
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}
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HAIRY wontreturn static void __sig_death(int sig, const char *thing) {
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textwindows wontreturn static void __sig_death(int sig, const char *thing) {
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#ifndef TINY
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intptr_t hStderr;
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char sigbuf[21], s[128], *p;
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@ -810,7 +810,7 @@ HAIRY static uint32_t __sig_worker(void *arg) {
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_pthread_mutex_unlock(&__sig_worker_lock);
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Sleep(POLL_INTERVAL_MS);
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}
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return 0;
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__builtin_unreachable();
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}
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__attribute__((__constructor__(10))) textstartup void __sig_init(void) {
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@ -34,6 +34,8 @@
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#include "libc/nt/thunk/msabi.h"
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#ifdef __x86_64__
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#define ABI __msabi textwindows dontinstrument
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// cut back on code size and avoid setting errno
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// this code is a mandatory dependency of winmain
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__msabi extern typeof(CloseHandle) *const __imp_CloseHandle;
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@ -47,8 +49,8 @@ __msabi extern typeof(GetEnvironmentVariable)
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*const __imp_GetEnvironmentVariableW;
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// Generates C:\ProgramData\cosmo\sig\x\y.pid like path
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__msabi textwindows dontinstrument char16_t *__sig_process_path(
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char16_t *path, uint32_t pid, int create_directories) {
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ABI char16_t *__sig_process_path(char16_t *path, uint32_t pid,
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int create_directories) {
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char16_t buf[3];
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char16_t *p = path;
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uint32_t vlen = __imp_GetEnvironmentVariableW(u"SYSTEMDRIVE", buf, 3);
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@ -100,7 +102,7 @@ __msabi textwindows dontinstrument char16_t *__sig_process_path(
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return path;
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}
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__msabi textwindows atomic_ulong *__sig_map_process(int pid, int disposition) {
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ABI atomic_ulong *__sig_map_process(int pid, int disposition) {
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char16_t path[128];
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__sig_process_path(path, pid, disposition == kNtOpenAlways);
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intptr_t hand = __imp_CreateFileW(path, kNtGenericRead | kNtGenericWrite,
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@ -32,8 +32,7 @@ int sys_sigprocmask(int how, const sigset_t *opt_set,
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how, opt_set ? (sigset_t *)(intptr_t)(uint32_t)*opt_set : 0, 0, 0);
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rc = 0;
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}
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if (rc != -1 && opt_out_oldset) {
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if (rc != -1 && opt_out_oldset)
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*opt_out_oldset = old[0];
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}
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return rc;
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}
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@ -36,12 +36,10 @@
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privileged const char *strsignal_r(int sig, char buf[21]) {
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char *p;
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const char *s;
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if (!sig) {
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if (!sig)
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return "0";
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}
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if ((s = GetMagnumStr(kSignalNames, sig))) {
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if ((s = GetMagnumStr(kSignalNames, sig)))
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return s;
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}
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if (SIGRTMIN <= sig && sig <= SIGRTMAX) {
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sig -= SIGRTMIN;
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buf[0] = 'S';
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@ -79,7 +79,11 @@ int ulock_wait(uint32_t operation, void *addr, uint64_t value,
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// it could also mean another thread calling ulock on this address was
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// configured (via operation) in an inconsistent way.
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//
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int ulock_wake(uint32_t operation, void *addr, uint64_t wake_value) {
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// should be dontinstrument because SiliconThreadMain() calls this from
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// a stack managed by apple libc.
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//
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dontinstrument int ulock_wake(uint32_t operation, void *addr,
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uint64_t wake_value) {
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int rc;
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rc = __syscall3i(operation, (long)addr, wake_value, 0x2000000 | 516);
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LOCKTRACE("ulock_wake(%#x, %p, %lx) → %s", operation, addr, wake_value,
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@ -48,9 +48,8 @@
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* @param st is open symbol table for current executable
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* @return -1 w/ errno if error happened
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*/
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dontinstrument int PrintBacktraceUsingSymbols(int fd,
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const struct StackFrame *bp,
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struct SymbolTable *st) {
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int PrintBacktraceUsingSymbols(int fd, const struct StackFrame *bp,
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struct SymbolTable *st) {
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size_t gi;
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char *cxxbuf;
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intptr_t addr;
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@ -33,14 +33,14 @@ static char __watch_last[4096];
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void __watch_hook(void);
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static dontinstrument inline void Copy(char *p, char *q, size_t n) {
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dontinstrument static inline void Copy(char *p, char *q, size_t n) {
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size_t i;
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for (i = 0; i < n; ++i) {
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p[i] = q[i];
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}
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}
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static dontinstrument inline int Cmp(char *p, char *q, size_t n) {
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dontinstrument static inline int Cmp(char *p, char *q, size_t n) {
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if (n == 8)
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return READ64LE(p) != READ64LE(q);
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if (n == 4)
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@ -291,21 +291,6 @@
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.balign 4
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.endm
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// Loads address of errno into %rcx
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.macro .errno
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call __errno_location
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.endm
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// Post-Initialization Read-Only (PIRO) BSS section.
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// @param ss is an optional string, for control image locality
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.macro .piro ss
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.ifnb \ss
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.section .piro.sort.bss.\ss,"aw",@nobits
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.else
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.section .piro.bss,"aw",@nobits
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.endif
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.endm
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// Helpers for Cosmopolitan _init() amalgamation magic.
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// @param name should be consistent across macros for a module
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// @see libc/runtime/_init.S
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@ -71,7 +71,7 @@ struct Procs __proc = {
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.lock = PTHREAD_MUTEX_INITIALIZER,
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};
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static textwindows void __proc_stats(int64_t h, struct rusage *ru) {
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textwindows static void __proc_stats(int64_t h, struct rusage *ru) {
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bzero(ru, sizeof(*ru));
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struct NtProcessMemoryCountersEx memcount = {sizeof(memcount)};
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GetProcessMemoryInfo(h, &memcount, sizeof(memcount));
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@ -137,7 +137,7 @@ textwindows int __proc_harvest(struct Proc *pr, bool iswait4) {
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return sic;
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}
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static textwindows dontinstrument uint32_t __proc_worker(void *arg) {
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textwindows dontinstrument static uint32_t __proc_worker(void *arg) {
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struct CosmoTib tls;
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char *sp = __builtin_frame_address(0);
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__bootstrap_tls(&tls, __builtin_frame_address(0));
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@ -246,7 +246,7 @@ static textwindows dontinstrument uint32_t __proc_worker(void *arg) {
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/**
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* Lazy initializes process tracker data structures and worker.
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*/
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static textwindows void __proc_setup(void) {
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textwindows static void __proc_setup(void) {
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__proc.onbirth = CreateEvent(0, 0, 0, 0); // auto reset
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__proc.haszombies = CreateEvent(0, 1, 0, 0); // manual reset
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__proc.thread = CreateThread(0, STACK_SIZE, __proc_worker, 0,
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@ -26,7 +26,7 @@
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// @param rdx x2 is ptid
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// @param rcx x3 is ctid
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// @param r8 x4 is tls
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// @param r9 x5 is func(void*,int)→int
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// @param r9 x5 is func(void*)→int
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// @param 8(rsp) x6 is arg
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// @return tid of child on success, or -errno on error
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sys_clone_linux:
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@ -45,16 +45,10 @@ sys_clone_linux:
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ret
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2: xor %ebp,%ebp // child thread
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mov %rbx,%rdi // arg
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mov %r10,%r15 // experiment
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mov (%r10),%esi // tid
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call *%r9 // func(arg,tid)
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xchg %eax,%edi // func(arg,tid) → exitcode
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mov (%r15),%eax // experiment
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test %eax,%eax // experiment
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jz 1f // experiment
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mov $60,%eax // __NR_exit(exitcode)
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syscall
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1: hlt // ctid was corrupted by program!
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#elif defined(__aarch64__)
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stp x29,x30,[sp,#-16]!
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mov x29,sp
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@ -69,7 +63,6 @@ sys_clone_linux:
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2: mov x29,#0 // wipe backtrace
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mov x28,x3 // set cosmo tls
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mov x0,x6 // child thread
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ldr w1,[x4] // arg2 = *ctid
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blr x5
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mov x8,#93 // __NR_exit
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svc #0
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@ -16,50 +16,27 @@
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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/sysv/consts/clone.h"
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#include "libc/assert.h"
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#include "libc/atomic.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/calls/struct/ucontext-netbsd.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/calls/wincrash.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/asmflag.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/describeflags.h"
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#include "libc/intrin/strace.h"
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#include "libc/intrin/ulock.h"
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#include "libc/intrin/weaken.h"
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#include "libc/limits.h"
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#include "libc/macros.h"
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#include "libc/mem/alloca.h"
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#include "libc/nt/enum/processcreationflags.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/signals.h"
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#include "libc/nt/synchronization.h"
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#include "libc/nt/thread.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/stack.h"
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#include "libc/runtime/syslib.internal.h"
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#include "libc/sock/internal.h"
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#include "libc/stdalign.h"
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#include "libc/stdio/sysparam.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/arch.h"
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#include "libc/sysv/consts/clone.h"
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#include "libc/sysv/consts/futex.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/sysv/consts/nrlinux.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/freebsd.internal.h"
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#include "libc/thread/openbsd.internal.h"
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#include "libc/thread/posixthread.internal.h"
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#include "libc/thread/thread.h"
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#include "libc/thread/tls.h"
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#include "libc/thread/xnu.internal.h"
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#define kMaxThreadIds 32768
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@ -79,28 +56,19 @@
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#define LWP_SUSPENDED 0x00000080
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struct CloneArgs {
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alignas(16) union {
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struct {
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atomic_int tid;
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int this;
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};
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union {
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long sp;
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int64_t tid64;
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};
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atomic_int *ptid;
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atomic_int *ctid;
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atomic_int *ztid;
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char *tls;
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int (*func)(void *, int);
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int (*func)(void *);
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void *arg;
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long sp;
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};
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int sys_set_tls(uintptr_t, void *);
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int __stack_call(void *, int, long, long, int (*)(void *, int), long);
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static long AlignStack(long sp, char *stk, long stksz, int mal) {
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return sp & -mal;
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}
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int __stack_call(void *, int, long, long, int (*)(void *), long);
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#ifdef __x86_64__
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@ -109,7 +77,6 @@ static long AlignStack(long sp, char *stk, long stksz, int mal) {
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__msabi extern typeof(ExitThread) *const __imp_ExitThread;
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__msabi extern typeof(GetCurrentThreadId) *const __imp_GetCurrentThreadId;
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__msabi extern typeof(TlsSetValue) *const __imp_TlsSetValue;
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__msabi extern typeof(WakeByAddressAll) *const __imp_WakeByAddressAll;
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textwindows dontinstrument wontreturn static void //
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@ -117,51 +84,45 @@ WinThreadEntry(int rdi, // rcx
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int rsi, // rdx
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int rdx, // r8
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struct CloneArgs *wt) { // r9
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int rc;
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if (wt->tls)
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__set_tls_win32(wt->tls);
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__set_tls_win32(wt->tls);
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int tid = __imp_GetCurrentThreadId();
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atomic_int *ctid = wt->ctid;
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atomic_init(ctid, tid);
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atomic_init(wt->ptid, tid);
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atomic_init(wt->ctid, tid);
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rc = __stack_call(wt->arg, wt->tid, 0, 0, wt->func, wt->sp);
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int rc = __stack_call(wt->arg, tid, 0, 0, wt->func, wt->sp);
|
||||
// we can now clear ctid directly since we're no longer using our own
|
||||
// stack memory, which can now be safely free'd by the parent thread.
|
||||
atomic_store_explicit(wt->ztid, 0, memory_order_release);
|
||||
__imp_WakeByAddressAll(wt->ztid);
|
||||
atomic_store_explicit(ctid, 0, memory_order_release);
|
||||
__imp_WakeByAddressAll(ctid);
|
||||
// since we didn't indirect this function through NT2SYSV() it's not
|
||||
// safe to simply return, and as such, we need ExitThread().
|
||||
__imp_ExitThread(rc);
|
||||
__builtin_unreachable();
|
||||
}
|
||||
|
||||
static textwindows errno_t CloneWindows(int (*func)(void *, int), char *stk,
|
||||
size_t stksz, int flags, void *arg,
|
||||
void *tls, atomic_int *ptid,
|
||||
atomic_int *ctid) {
|
||||
textwindows static errno_t CloneWindows(int (*func)(void *), char *stk,
|
||||
size_t stksz, void *arg, void *tls,
|
||||
atomic_int *ptid, atomic_int *ctid) {
|
||||
long sp;
|
||||
int64_t h;
|
||||
intptr_t tip;
|
||||
uint32_t utid;
|
||||
struct CloneArgs *wt;
|
||||
sp = (intptr_t)stk + stksz;
|
||||
sp = AlignStack(sp, stk, stksz, 16);
|
||||
sp = tip = (intptr_t)stk + stksz;
|
||||
sp -= sizeof(struct CloneArgs);
|
||||
sp &= -alignof(struct CloneArgs);
|
||||
wt = (struct CloneArgs *)sp;
|
||||
wt->ctid = flags & CLONE_CHILD_SETTID ? ctid : &wt->tid;
|
||||
wt->ptid = flags & CLONE_PARENT_SETTID ? ptid : &wt->tid;
|
||||
wt->ztid = flags & CLONE_CHILD_CLEARTID ? ctid : &wt->tid;
|
||||
wt->ctid = ctid;
|
||||
wt->ptid = ptid;
|
||||
wt->func = func;
|
||||
wt->arg = arg;
|
||||
wt->tls = flags & CLONE_SETTLS ? tls : 0;
|
||||
wt->sp = sp;
|
||||
wt->tls = tls;
|
||||
wt->sp = tip & -16;
|
||||
if ((h = CreateThread(&kNtIsInheritable, 65536, (void *)WinThreadEntry, wt,
|
||||
kNtStackSizeParamIsAReservation, &utid))) {
|
||||
if (flags & CLONE_PARENT_SETTID)
|
||||
atomic_init(ptid, utid);
|
||||
if (flags & CLONE_SETTLS) {
|
||||
struct CosmoTib *tib = tls;
|
||||
atomic_store_explicit(&tib->tib_syshand, h, memory_order_release);
|
||||
}
|
||||
atomic_init(ptid, utid);
|
||||
struct CosmoTib *tib = tls;
|
||||
atomic_store_explicit(&tib->tib_syshand, h, memory_order_release);
|
||||
return 0;
|
||||
} else {
|
||||
return __dos2errno(GetLastError());
|
||||
|
|
@ -185,37 +146,33 @@ asm("XnuThreadThunk:\n\t"
|
|||
".size\tXnuThreadThunk,.-XnuThreadThunk");
|
||||
__attribute__((__used__))
|
||||
|
||||
static dontinstrument wontreturn void
|
||||
XnuThreadMain(void *pthread, // rdi
|
||||
int tid, // rsi
|
||||
int (*func)(void *arg, int tid), // rdx
|
||||
void *arg, // rcx
|
||||
struct CloneArgs *wt, // r8
|
||||
unsigned xnuflags) { // r9
|
||||
int ax;
|
||||
|
||||
wt->tid = tid;
|
||||
dontinstrument wontreturn static void
|
||||
XnuThreadMain(void *pthread, // rdi
|
||||
int tid, // rsi
|
||||
int (*func)(void *arg), // rdx
|
||||
void *arg, // rcx
|
||||
struct CloneArgs *wt, // r8
|
||||
unsigned xnuflags) { // r9
|
||||
atomic_init(wt->ctid, tid);
|
||||
atomic_init(wt->ptid, tid);
|
||||
|
||||
if (wt->tls) {
|
||||
// XNU uses the same 0x30 offset as the WIN32 TIB x64. They told the
|
||||
// Go team at Google that they Apply stands by our ability to use it
|
||||
// https://github.com/golang/go/issues/23617#issuecomment-376662373
|
||||
asm volatile("syscall"
|
||||
: "=a"(ax)
|
||||
: "0"(__NR_thread_fast_set_cthread_self), "D"(wt->tls - 0x30)
|
||||
: "rcx", "rdx", "r8", "r9", "r10", "r11", "memory", "cc");
|
||||
}
|
||||
// XNU uses the same 0x30 offset as the WIN32 TIB x64. They told the
|
||||
// Go team at Google that they Apply stands by our ability to use it
|
||||
// https://github.com/golang/go/issues/23617#issuecomment-376662373
|
||||
int ax;
|
||||
asm volatile("syscall"
|
||||
: "=a"(ax)
|
||||
: "0"(__NR_thread_fast_set_cthread_self), "D"(wt->tls - 0x30)
|
||||
: "rcx", "rdx", "r8", "r9", "r10", "r11", "memory", "cc");
|
||||
|
||||
func(arg, tid);
|
||||
func(arg);
|
||||
|
||||
// we no longer use the stack after this point
|
||||
// %rax = int bsdthread_terminate(%rdi = void *stackaddr,
|
||||
// %rsi = size_t freesize,
|
||||
// %rdx = uint32_t port,
|
||||
// %r10 = uint32_t sem);
|
||||
asm volatile("movl\t$0,(%%rsi)\n\t" // *wt->ztid = 0
|
||||
asm volatile("movl\t$0,(%%rsi)\n\t" // *wt->ctid = 0
|
||||
"mov\t$0x101,%%edi\n\t" // wake all
|
||||
"xor\t%%edx,%%edx\n\t" // wake_value
|
||||
"mov\t$0x02000204,%%eax\n\t" // ulock_wake()
|
||||
|
|
@ -227,19 +184,18 @@ XnuThreadMain(void *pthread, // rdi
|
|||
"mov\t$0x02000169,%%eax\n\t" // bsdthread_terminate()
|
||||
"syscall"
|
||||
: /* no outputs */
|
||||
: "S"(wt->ztid)
|
||||
: "S"(wt->ctid)
|
||||
: "rax", "rcx", "r10", "r11", "memory");
|
||||
__builtin_unreachable();
|
||||
}
|
||||
|
||||
static errno_t CloneXnu(int (*fn)(void *), char *stk, size_t stksz, int flags,
|
||||
void *arg, void *tls, atomic_int *ptid,
|
||||
atomic_int *ctid) {
|
||||
static errno_t CloneXnu(int (*fn)(void *), char *stk, size_t stksz, void *arg,
|
||||
void *tls, atomic_int *ptid, atomic_int *ctid) {
|
||||
|
||||
// perform this weird mandatory system call once
|
||||
static bool once;
|
||||
if (!once) {
|
||||
npassert(sys_bsdthread_register(XnuThreadThunk, 0, 0, 0, 0, 0, 0) != -1);
|
||||
sys_bsdthread_register(XnuThreadThunk, 0, 0, 0, 0, 0, 0);
|
||||
once = true;
|
||||
}
|
||||
|
||||
|
|
@ -247,16 +203,15 @@ static errno_t CloneXnu(int (*fn)(void *), char *stk, size_t stksz, int flags,
|
|||
long sp;
|
||||
struct CloneArgs *wt;
|
||||
sp = (intptr_t)stk + stksz;
|
||||
sp = AlignStack(sp, stk, stksz, 16);
|
||||
sp -= sizeof(struct CloneArgs);
|
||||
sp &= -alignof(struct CloneArgs);
|
||||
wt = (struct CloneArgs *)sp;
|
||||
sp &= -16;
|
||||
|
||||
// pass parameters to new thread via xnu
|
||||
wt->ctid = flags & CLONE_CHILD_SETTID ? ctid : &wt->tid;
|
||||
wt->ptid = flags & CLONE_PARENT_SETTID ? ptid : &wt->tid;
|
||||
wt->ztid = flags & CLONE_CHILD_CLEARTID ? ctid : &wt->tid;
|
||||
wt->tls = flags & CLONE_SETTLS ? tls : 0;
|
||||
wt->ctid = ctid;
|
||||
wt->ptid = ptid;
|
||||
wt->tls = tls;
|
||||
return sys_clone_xnu(fn, arg, wt, 0, PTHREAD_START_CUSTOM_XNU);
|
||||
}
|
||||
|
||||
|
|
@ -267,25 +222,25 @@ static errno_t CloneXnu(int (*fn)(void *), char *stk, size_t stksz, int flags,
|
|||
// 1. __asan_handle_no_return wipes stack [todo?]
|
||||
relegated dontinstrument wontreturn static void OpenbsdThreadMain(void *p) {
|
||||
struct CloneArgs *wt = p;
|
||||
atomic_init(wt->ptid, wt->tid);
|
||||
atomic_init(wt->ctid, wt->tid);
|
||||
wt->func(wt->arg, wt->tid);
|
||||
asm volatile("mov\t%2,%%rsp\n\t" // so syscall can validate stack exists
|
||||
"movl\t$0,(%%rdi)\n\t" // *wt->ztid = 0 (old stack now free'd)
|
||||
int tid = atomic_load_explicit(wt->ctid, memory_order_relaxed);
|
||||
atomic_init(wt->ptid, tid);
|
||||
wt->func(wt->arg);
|
||||
asm volatile("mov\t%1,%%rsp\n\t" // so syscall can validate stack exists
|
||||
"movl\t$0,(%2)\n\t" // *wt->ctid = 0 (old stack now free'd)
|
||||
"syscall\n\t" // futex(int*, op, val) will wake wait0
|
||||
"xor\t%%edi,%%edi\n\t" // so kernel doesn't write to old stack
|
||||
"mov\t$302,%%eax\n\t" // __threxit(int *notdead) doesn't wake
|
||||
"syscall"
|
||||
: "=m"(*wt->ztid)
|
||||
: "a"(83), "m"(__oldstack), "D"(wt->ztid),
|
||||
: /* no outputs */
|
||||
: "a"(83), "m"(__oldstack), "D"(wt->ctid),
|
||||
"S"(2 /* FUTEX_WAKE */), "d"(INT_MAX)
|
||||
: "rcx", "r11", "memory");
|
||||
__builtin_unreachable();
|
||||
}
|
||||
|
||||
relegated errno_t CloneOpenbsd(int (*func)(void *, int), char *stk,
|
||||
size_t stksz, int flags, void *arg, void *tls,
|
||||
atomic_int *ptid, atomic_int *ctid) {
|
||||
relegated static errno_t CloneOpenbsd(int (*func)(void *), char *stk,
|
||||
size_t stksz, void *arg, void *tls,
|
||||
atomic_int *ptid, atomic_int *ctid) {
|
||||
int rc;
|
||||
intptr_t sp;
|
||||
struct __tfork *tf;
|
||||
|
|
@ -297,18 +252,18 @@ relegated errno_t CloneOpenbsd(int (*func)(void *, int), char *stk,
|
|||
sp -= sizeof(struct CloneArgs);
|
||||
sp &= -alignof(struct CloneArgs);
|
||||
wt = (struct CloneArgs *)sp;
|
||||
sp = AlignStack(sp, stk, stksz, 16);
|
||||
wt->ctid = flags & CLONE_CHILD_SETTID ? ctid : &wt->tid;
|
||||
wt->ptid = flags & CLONE_PARENT_SETTID ? ptid : &wt->tid;
|
||||
wt->ztid = flags & CLONE_CHILD_CLEARTID ? ctid : &wt->tid;
|
||||
sp &= -16;
|
||||
sp -= 8;
|
||||
*(intptr_t *)sp = (intptr_t)CloneOpenbsd + 1;
|
||||
wt->ctid = ctid;
|
||||
wt->ptid = ptid;
|
||||
wt->arg = arg;
|
||||
wt->func = func;
|
||||
tf->tf_stack = (char *)sp - 8;
|
||||
tf->tf_tcb = flags & CLONE_SETTLS ? tls : 0;
|
||||
tf->tf_tid = &wt->tid;
|
||||
tf->tf_stack = (char *)sp;
|
||||
tf->tf_tcb = tls;
|
||||
tf->tf_tid = ctid;
|
||||
if ((rc = __tfork_thread(tf, sizeof(*tf), OpenbsdThreadMain, wt)) >= 0) {
|
||||
if (flags & CLONE_PARENT_SETTID)
|
||||
atomic_init(ptid, rc);
|
||||
atomic_init(ptid, rc);
|
||||
return 0;
|
||||
} else {
|
||||
return -rc;
|
||||
|
|
@ -319,35 +274,30 @@ relegated errno_t CloneOpenbsd(int (*func)(void *, int), char *stk,
|
|||
// NET BESIYATA DISHMAYA
|
||||
|
||||
wontreturn dontinstrument static void NetbsdThreadMain(
|
||||
void *arg, // rdi
|
||||
int (*func)(void *, int), // rsi
|
||||
int flags, // rdx
|
||||
atomic_int *ctid, // rcx
|
||||
atomic_int *ptid) { // r8
|
||||
int ax, dx;
|
||||
static atomic_int clobber;
|
||||
atomic_int *ztid = &clobber;
|
||||
ax = sys_gettid();
|
||||
if (flags & CLONE_CHILD_SETTID)
|
||||
atomic_init(ctid, ax);
|
||||
if (flags & CLONE_PARENT_SETTID)
|
||||
atomic_init(ptid, ax);
|
||||
if (flags & CLONE_CHILD_CLEARTID)
|
||||
ztid = ctid;
|
||||
func(arg, ax);
|
||||
void *arg, // rdi
|
||||
int (*func)(void *), // rsi
|
||||
atomic_int *ctid, // rdx
|
||||
atomic_int *ptid) { // rcx
|
||||
int ax;
|
||||
asm("syscall"
|
||||
: "=a"(ax) // man says always succeeds
|
||||
: "0"(311) // _lwp_self()
|
||||
: "rcx", "rdx", "r8", "r9", "r10", "r11", "memory", "cc");
|
||||
atomic_init(ctid, ax);
|
||||
atomic_init(ptid, ax);
|
||||
func(arg);
|
||||
// we no longer use the stack after this point
|
||||
// %eax = int __lwp_exit(void);
|
||||
asm volatile("movl\t$0,%2\n\t" // *ztid = 0
|
||||
"syscall" // __lwp_exit()
|
||||
: "=a"(ax), "=d"(dx), "=m"(*ztid)
|
||||
: "0"(310)
|
||||
asm volatile("movl\t$0,(%2)\n\t" // *ztid = 0
|
||||
"syscall" // __lwp_exit()
|
||||
: "=a"(ax)
|
||||
: "0"(310), "r"(ctid)
|
||||
: "rcx", "r11", "memory");
|
||||
__builtin_unreachable();
|
||||
}
|
||||
|
||||
static int CloneNetbsd(int (*func)(void *, int), char *stk, size_t stksz,
|
||||
int flags, void *arg, void *tls, atomic_int *ptid,
|
||||
atomic_int *ctid) {
|
||||
static int CloneNetbsd(int (*func)(void *), char *stk, size_t stksz, void *arg,
|
||||
void *tls, atomic_int *ptid, atomic_int *ctid) {
|
||||
// NetBSD has its own clone() and it works, but it's technically a
|
||||
// second-class API, intended to help Linux folks migrate to this.
|
||||
int ax;
|
||||
|
|
@ -363,13 +313,12 @@ static int CloneNetbsd(int (*func)(void *, int), char *stk, size_t stksz,
|
|||
: CFLAG_CONSTRAINT(failed), "=a"(ax)
|
||||
: "1"(__NR_getcontext_netbsd), "D"(&netbsd_clone_template)
|
||||
: "rcx", "rdx", "r8", "r9", "r10", "r11", "memory");
|
||||
npassert(!failed);
|
||||
once = true;
|
||||
}
|
||||
sp = (intptr_t)stk + stksz;
|
||||
|
||||
// align the stack
|
||||
sp = AlignStack(sp, stk, stksz, 16);
|
||||
sp &= -16;
|
||||
|
||||
// simulate call to misalign stack and ensure backtrace looks good
|
||||
sp -= 8;
|
||||
|
|
@ -377,8 +326,7 @@ static int CloneNetbsd(int (*func)(void *, int), char *stk, size_t stksz,
|
|||
|
||||
// place the giant 784 byte ucontext structure in the red zone!
|
||||
// it only has to live long enough for the thread to come alive
|
||||
ctx = (struct ucontext_netbsd *)((sp - sizeof(struct ucontext_netbsd)) &
|
||||
-alignof(struct ucontext_netbsd));
|
||||
ctx = (struct ucontext_netbsd *)((sp - sizeof(struct ucontext_netbsd)) & -64);
|
||||
|
||||
// pass parameters in process state
|
||||
memcpy(ctx, &netbsd_clone_template, sizeof(*ctx));
|
||||
|
|
@ -388,17 +336,14 @@ static int CloneNetbsd(int (*func)(void *, int), char *stk, size_t stksz,
|
|||
ctx->uc_mcontext.rip = (intptr_t)NetbsdThreadMain;
|
||||
ctx->uc_mcontext.rdi = (intptr_t)arg;
|
||||
ctx->uc_mcontext.rsi = (intptr_t)func;
|
||||
ctx->uc_mcontext.rdx = flags;
|
||||
ctx->uc_mcontext.rcx = (intptr_t)ctid;
|
||||
ctx->uc_mcontext.r8 = (intptr_t)ptid;
|
||||
ctx->uc_mcontext.rdx = (intptr_t)ctid;
|
||||
ctx->uc_mcontext.rcx = (intptr_t)ptid;
|
||||
ctx->uc_flags |= _UC_STACK;
|
||||
ctx->uc_stack.ss_sp = stk;
|
||||
ctx->uc_stack.ss_size = stksz;
|
||||
ctx->uc_stack.ss_flags = 0;
|
||||
if (flags & CLONE_SETTLS) {
|
||||
ctx->uc_flags |= _UC_TLSBASE;
|
||||
ctx->uc_mcontext._mc_tlsbase = (intptr_t)tls;
|
||||
}
|
||||
ctx->uc_flags |= _UC_TLSBASE;
|
||||
ctx->uc_mcontext._mc_tlsbase = (intptr_t)tls;
|
||||
|
||||
// perform the system call
|
||||
int tid = 0;
|
||||
|
|
@ -407,9 +352,7 @@ static int CloneNetbsd(int (*func)(void *, int), char *stk, size_t stksz,
|
|||
: "1"(__NR__lwp_create), "D"(ctx), "S"(LWP_DETACHED), "2"(&tid)
|
||||
: "rcx", "r8", "r9", "r10", "r11", "memory");
|
||||
if (!failed) {
|
||||
unassert(tid);
|
||||
if (flags & CLONE_PARENT_SETTID)
|
||||
atomic_init(ptid, tid);
|
||||
atomic_init(ptid, tid);
|
||||
return 0;
|
||||
} else {
|
||||
return ax;
|
||||
|
|
@ -428,35 +371,35 @@ wontreturn dontinstrument static void FreebsdThreadMain(void *p) {
|
|||
#elif defined(__x86_64__)
|
||||
sys_set_tls(AMD64_SET_GSBASE, wt->tls);
|
||||
#endif
|
||||
atomic_init(wt->ctid, wt->tid);
|
||||
atomic_init(wt->ptid, wt->tid);
|
||||
wt->func(wt->arg, wt->tid);
|
||||
atomic_init(wt->ctid, wt->tid64);
|
||||
atomic_init(wt->ptid, wt->tid64);
|
||||
wt->func(wt->arg);
|
||||
// we no longer use the stack after this point
|
||||
// void thr_exit(%rdi = long *state);
|
||||
#ifdef __x86_64__
|
||||
asm volatile("movl\t$0,%0\n\t" // *wt->ztid = 0
|
||||
"syscall\n\t" // _umtx_op(wt->ztid, WAKE, INT_MAX)
|
||||
asm volatile("movl\t$0,%0\n\t" // *wt->ctid = 0
|
||||
"syscall\n\t" // _umtx_op(wt->ctid, WAKE, INT_MAX)
|
||||
"movl\t$431,%%eax\n\t" // thr_exit(long *nonzeroes_and_wake)
|
||||
"xor\t%%edi,%%edi\n\t" // sad we can't use this free futex op
|
||||
"syscall\n\t" // thr_exit() fails if thread is orphaned
|
||||
"movl\t$1,%%eax\n\t" // _exit()
|
||||
"syscall" //
|
||||
: "=m"(*wt->ztid)
|
||||
: "a"(454), "D"(wt->ztid), "S"(UMTX_OP_WAKE), "d"(INT_MAX)
|
||||
: "=m"(*wt->ctid)
|
||||
: "a"(454), "D"(wt->ctid), "S"(UMTX_OP_WAKE), "d"(INT_MAX)
|
||||
: "rcx", "r8", "r9", "r10", "r11", "memory");
|
||||
#elif defined(__aarch64__)
|
||||
register long x0 asm("x0") = (long)wt->ztid;
|
||||
register long x0 asm("x0") = (long)wt->ctid;
|
||||
register long x1 asm("x1") = UMTX_OP_WAKE;
|
||||
register long x2 asm("x2") = INT_MAX;
|
||||
register long x8 asm("x8") = 454; // _umtx_op
|
||||
asm volatile("str\twzr,%0\n\t" // *wt->ztid = 0
|
||||
"svc\t0\n\t" // _umtx_op(wt->ztid, WAKE, INT_MAX)
|
||||
asm volatile("str\twzr,%0\n\t" // *wt->ctid = 0
|
||||
"svc\t0\n\t" // _umtx_op(wt->ctid, WAKE, INT_MAX)
|
||||
"mov\tx0,#0\n\t" // arg0 = 0
|
||||
"mov\tx8,#431\n\t" // thr_exit
|
||||
"svc\t0\n\t" // thr_exit(long *nonzeroes_and_wake = 0)
|
||||
"mov\tx8,#1\n\t" // _exit
|
||||
"svc\t0" // _exit(long *nonzeroes_and_wake = 0)
|
||||
: "=m"(*wt->ztid)
|
||||
: "=m"(*wt->ctid)
|
||||
: "r"(x0), "r"(x1), "r"(x2), "r"(x8));
|
||||
#else
|
||||
#error "unsupported architecture"
|
||||
|
|
@ -464,20 +407,19 @@ wontreturn dontinstrument static void FreebsdThreadMain(void *p) {
|
|||
__builtin_unreachable();
|
||||
}
|
||||
|
||||
static errno_t CloneFreebsd(int (*func)(void *, int), char *stk, size_t stksz,
|
||||
int flags, void *arg, void *tls, atomic_int *ptid,
|
||||
static errno_t CloneFreebsd(int (*func)(void *), char *stk, size_t stksz,
|
||||
void *arg, void *tls, atomic_int *ptid,
|
||||
atomic_int *ctid) {
|
||||
long sp;
|
||||
int64_t tid;
|
||||
int64_t tid64;
|
||||
struct CloneArgs *wt;
|
||||
sp = (intptr_t)stk + stksz;
|
||||
sp -= sizeof(struct CloneArgs);
|
||||
sp &= -alignof(struct CloneArgs);
|
||||
wt = (struct CloneArgs *)sp;
|
||||
sp = AlignStack(sp, stk, stksz, 16);
|
||||
wt->ctid = flags & CLONE_CHILD_SETTID ? ctid : &wt->tid;
|
||||
wt->ptid = flags & CLONE_PARENT_SETTID ? ptid : &wt->tid;
|
||||
wt->ztid = flags & CLONE_CHILD_CLEARTID ? ctid : &wt->tid;
|
||||
sp &= -16;
|
||||
wt->ctid = ctid;
|
||||
wt->ptid = ptid;
|
||||
wt->tls = tls;
|
||||
wt->func = func;
|
||||
wt->arg = arg;
|
||||
|
|
@ -486,10 +428,10 @@ static errno_t CloneFreebsd(int (*func)(void *, int), char *stk, size_t stksz,
|
|||
.arg = wt,
|
||||
.stack_base = stk,
|
||||
.stack_size = sp - (long)stk,
|
||||
.tls_base = flags & CLONE_SETTLS ? tls : 0,
|
||||
.tls_base = tls,
|
||||
.tls_size = 64,
|
||||
.child_tid = &wt->tid64,
|
||||
.parent_tid = &tid,
|
||||
.parent_tid = &tid64,
|
||||
};
|
||||
#ifdef __x86_64__
|
||||
int ax;
|
||||
|
|
@ -510,8 +452,7 @@ static errno_t CloneFreebsd(int (*func)(void *, int), char *stk, size_t stksz,
|
|||
#else
|
||||
#error "unsupported architecture"
|
||||
#endif
|
||||
if (flags & CLONE_PARENT_SETTID)
|
||||
atomic_init(ptid, tid);
|
||||
atomic_init(ptid, tid64);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -522,57 +463,57 @@ static errno_t CloneFreebsd(int (*func)(void *, int), char *stk, size_t stksz,
|
|||
|
||||
dontinstrument static void *SiliconThreadMain(void *arg) {
|
||||
struct CloneArgs *wt = arg;
|
||||
atomic_int *ctid = wt->ctid;
|
||||
int tid = atomic_load_explicit(ctid, memory_order_relaxed);
|
||||
asm volatile("mov\tx28,%0" : /* no outputs */ : "r"(wt->tls));
|
||||
atomic_init(wt->ctid, wt->this);
|
||||
atomic_init(wt->ptid, wt->this);
|
||||
__stack_call(wt->arg, wt->this, 0, 0, wt->func, wt->sp);
|
||||
atomic_store_explicit(wt->ztid, 0, memory_order_release);
|
||||
ulock_wake(UL_COMPARE_AND_WAIT | ULF_WAKE_ALL, wt->ztid, 0);
|
||||
__stack_call(wt->arg, tid, 0, 0, wt->func, wt->sp);
|
||||
atomic_store_explicit(ctid, 0, memory_order_release);
|
||||
ulock_wake(UL_COMPARE_AND_WAIT | ULF_WAKE_ALL, ctid, 0);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static errno_t CloneSilicon(int (*fn)(void *, int), char *stk, size_t stksz,
|
||||
int flags, void *arg, void *tls, atomic_int *ptid,
|
||||
static errno_t CloneSilicon(int (*fn)(void *), char *stk, size_t stksz,
|
||||
void *arg, void *tls, atomic_int *ptid,
|
||||
atomic_int *ctid) {
|
||||
long sp;
|
||||
void *attr;
|
||||
errno_t res;
|
||||
unsigned tid;
|
||||
pthread_t th;
|
||||
size_t babystack;
|
||||
struct CloneArgs *wt;
|
||||
|
||||
// assign tid to new thread
|
||||
static atomic_uint tids;
|
||||
sp = (intptr_t)stk + stksz;
|
||||
unsigned tid = atomic_fetch_add_explicit(&tids, 1, memory_order_relaxed);
|
||||
tid %= kMaxThreadIds;
|
||||
tid += kMinThreadId;
|
||||
atomic_init(ctid, tid);
|
||||
atomic_init(ptid, tid);
|
||||
|
||||
// pass temp data on stack
|
||||
intptr_t sp, tip;
|
||||
struct CloneArgs *wt;
|
||||
sp = tip = (intptr_t)stk + stksz;
|
||||
sp -= sizeof(struct CloneArgs);
|
||||
sp &= -alignof(struct CloneArgs);
|
||||
wt = (struct CloneArgs *)sp;
|
||||
sp = AlignStack(sp, stk, stksz, 16);
|
||||
tid = atomic_fetch_add_explicit(&tids, 1, memory_order_acq_rel);
|
||||
wt->this = tid = (tid % kMaxThreadIds) + kMinThreadId;
|
||||
wt->ctid = flags & CLONE_CHILD_SETTID ? ctid : &wt->tid;
|
||||
wt->ptid = flags & CLONE_PARENT_SETTID ? ptid : &wt->tid;
|
||||
wt->ztid = flags & CLONE_CHILD_CLEARTID ? ctid : &wt->tid;
|
||||
wt->tls = flags & CLONE_SETTLS ? tls : 0;
|
||||
wt->func = fn;
|
||||
wt->arg = arg;
|
||||
wt->sp = sp;
|
||||
babystack = __syslib->__pthread_stack_min;
|
||||
wt->tls = tls;
|
||||
wt->ctid = ctid;
|
||||
wt->sp = tip & -16;
|
||||
|
||||
// ask apple libc to spawn thread
|
||||
errno_t res;
|
||||
pthread_t th;
|
||||
size_t babystack = __syslib->__pthread_stack_min;
|
||||
#pragma GCC push_options
|
||||
#pragma GCC diagnostic ignored "-Walloca-larger-than="
|
||||
attr = alloca(__syslib->__sizeof_pthread_attr_t);
|
||||
void *attr = alloca(__syslib->__sizeof_pthread_attr_t);
|
||||
#pragma GCC pop_options
|
||||
unassert(!__syslib->__pthread_attr_init(attr));
|
||||
unassert(!__syslib->__pthread_attr_setguardsize(attr, 0));
|
||||
unassert(!__syslib->__pthread_attr_setstacksize(attr, babystack));
|
||||
__syslib->__pthread_attr_init(attr);
|
||||
__syslib->__pthread_attr_setguardsize(attr, 0);
|
||||
__syslib->__pthread_attr_setstacksize(attr, babystack);
|
||||
if (!(res = __syslib->__pthread_create(&th, attr, SiliconThreadMain, wt))) {
|
||||
if (flags & CLONE_PARENT_SETTID)
|
||||
atomic_init(ptid, tid);
|
||||
if (flags & CLONE_SETTLS) {
|
||||
struct CosmoTib *tib = tls;
|
||||
atomic_store_explicit(&tib[-1].tib_syshand, th, memory_order_release);
|
||||
}
|
||||
atomic_init(ptid, tid);
|
||||
struct CosmoTib *tib = tls;
|
||||
atomic_store_explicit(&tib[-1].tib_syshand, th, memory_order_release);
|
||||
}
|
||||
unassert(!__syslib->__pthread_attr_destroy(attr));
|
||||
__syslib->__pthread_attr_destroy(attr);
|
||||
return res;
|
||||
}
|
||||
|
||||
|
|
@ -582,10 +523,9 @@ static errno_t CloneSilicon(int (*fn)(void *, int), char *stk, size_t stksz,
|
|||
// GNU/SYSTEMD
|
||||
|
||||
struct LinuxCloneArgs {
|
||||
int (*func)(void *, int);
|
||||
int (*func)(void *);
|
||||
void *arg;
|
||||
char *tls;
|
||||
atomic_int ctid;
|
||||
};
|
||||
|
||||
int sys_clone_linux(int flags, // rdi
|
||||
|
|
@ -596,44 +536,32 @@ int sys_clone_linux(int flags, // rdi
|
|||
void *func, // r9
|
||||
void *arg); // 8(rsp)
|
||||
|
||||
dontinstrument static int LinuxThreadEntry(void *arg, int tid) {
|
||||
dontinstrument static int AmdLinuxThreadEntry(void *arg) {
|
||||
struct LinuxCloneArgs *wt = arg;
|
||||
#if defined(__x86_64__)
|
||||
sys_set_tls(ARCH_SET_GS, wt->tls);
|
||||
#endif
|
||||
return wt->func(wt->arg, tid);
|
||||
return wt->func(wt->arg);
|
||||
}
|
||||
|
||||
static int CloneLinux(int (*func)(void *arg, int rc), char *stk, size_t stksz,
|
||||
int flags, void *arg, void *tls, atomic_int *ptid,
|
||||
static int CloneLinux(int (*func)(void *), char *stk, size_t stksz, int flags,
|
||||
void *arg, void *tls, atomic_int *ptid,
|
||||
atomic_int *ctid) {
|
||||
int rc;
|
||||
long sp;
|
||||
struct LinuxCloneArgs *wt;
|
||||
sp = (intptr_t)stk + stksz;
|
||||
long sp = (intptr_t)stk + stksz;
|
||||
|
||||
#if defined(__x86_64__)
|
||||
sp -= sizeof(struct LinuxCloneArgs);
|
||||
sp &= -alignof(struct LinuxCloneArgs);
|
||||
wt = (struct LinuxCloneArgs *)sp;
|
||||
// align the stack
|
||||
#ifdef __aarch64__
|
||||
sp = AlignStack(sp, stk, stksz, 128); // for kernel <=4.6
|
||||
#else
|
||||
sp = AlignStack(sp, stk, stksz, 16);
|
||||
struct LinuxCloneArgs *wt = (struct LinuxCloneArgs *)sp;
|
||||
sp &= -16; // align the stack
|
||||
wt->arg = arg;
|
||||
wt->tls = tls;
|
||||
wt->func = func;
|
||||
func = AmdLinuxThreadEntry;
|
||||
arg = wt;
|
||||
#elif defined(__aarch64__)
|
||||
sp &= -128; // for kernels <=4.6
|
||||
#endif
|
||||
#ifdef __x86_64__
|
||||
if (flags & CLONE_SETTLS) {
|
||||
flags &= ~CLONE_SETTLS;
|
||||
wt->arg = arg;
|
||||
wt->tls = tls;
|
||||
wt->func = func;
|
||||
func = LinuxThreadEntry;
|
||||
arg = wt;
|
||||
}
|
||||
#endif
|
||||
if (~flags & CLONE_CHILD_SETTID) {
|
||||
flags |= CLONE_CHILD_SETTID;
|
||||
ctid = &wt->ctid;
|
||||
}
|
||||
|
||||
int rc;
|
||||
if ((rc = sys_clone_linux(flags, sp, ptid, ctid, tls, func, arg)) >= 0) {
|
||||
// clone() is documented as setting ptid before return
|
||||
return 0;
|
||||
|
|
@ -646,110 +574,9 @@ static int CloneLinux(int (*func)(void *arg, int rc), char *stk, size_t stksz,
|
|||
// COSMOPOLITAN
|
||||
|
||||
/**
|
||||
* Creates thread without malloc being linked.
|
||||
* Creates thread without malloc() being linked.
|
||||
*
|
||||
* If you use clone() you're on your own. Example:
|
||||
*
|
||||
* int worker(void *arg) { return 0; }
|
||||
* struct CosmoTib tib = {.tib_self = &tib, .tib_ctid = -1};
|
||||
* atomic_int tid;
|
||||
* char *stk = NewCosmoStack();
|
||||
* clone(worker, stk, GetStackSize() - 16,
|
||||
* CLONE_VM | CLONE_THREAD | CLONE_FS | CLONE_FILES |
|
||||
* CLONE_SYSVSEM | CLONE_SIGHAND | CLONE_PARENT_SETTID |
|
||||
* CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID | CLONE_SETTLS,
|
||||
* arg, &tid, &tib, &tib.tib_tid);
|
||||
* while (atomic_load(&tid) == 0) sched_yield();
|
||||
* // thread is known
|
||||
* while (atomic_load(&tib.tib_ctid) < 0) sched_yield();
|
||||
* // thread is running
|
||||
* while (atomic_load(&tib.tib_ctid) > 0) sched_yield();
|
||||
* // thread has terminated
|
||||
* FreeCosmoStack(stk);
|
||||
*
|
||||
* Threads are created in a detached manner. They currently can't be
|
||||
* synchronized using wait() or posix signals. Threads created by this
|
||||
* function should be synchronized using shared memory operations.
|
||||
*
|
||||
* Any memory that's required by this system call wrapper is allocated
|
||||
* to the top of your stack. This shouldn't be more than 128 bytes.
|
||||
*
|
||||
* Your function is called from within the stack you specify. A return
|
||||
* address is pushed onto your stack, that causes returning to jump to
|
||||
* _Exit1() which terminates the thread. Even though the callback says
|
||||
* it supports a return code, that'll only work on Linux and Windows.
|
||||
*
|
||||
* This function follows the same ABI convention as the Linux userspace
|
||||
* libraries, with a few small changes. The varargs has been removed to
|
||||
* help prevent broken code, and the stack size and tls size parameters
|
||||
* are introduced for compatibility with FreeBSD.
|
||||
*
|
||||
* To keep this system call lightweight, only the thread creation use
|
||||
* case is polyfilled across platforms. For example, if you want fork
|
||||
* that works on OpenBSD for example, don't do it with clone(SIGCHLD)
|
||||
* and please just call fork(). Even if you do that on Linux, it will
|
||||
* effectively work around libc features like atfork(), so that means
|
||||
* other calls like getpid() may return incorrect values.
|
||||
*
|
||||
* @param func is your callback function, which this wrapper requires
|
||||
* not be null, otherwise EINVAL is raised. It is passed two args
|
||||
* within the child thread: (1) the caller-supplied `arg` and (2)
|
||||
* the new tid is always passed in the second arg for convenience
|
||||
*
|
||||
* @param stk points to the bottom of a caller allocated stack, which
|
||||
* must be allocated via mmap() using the MAP_STACK flag, or else
|
||||
* you won't get optimal performance and it won't work on OpenBSD
|
||||
*
|
||||
* @param stksz is the size of that stack in bytes, we recommend that
|
||||
* that this be set to GetStackSize() or else memory safety tools
|
||||
* like kprintf() can't do as good and quick of a job; this value
|
||||
* must be 16-aligned plus it must be at least 4192 bytes in size
|
||||
* and it's advised to have the bottom-most page, be a guard page
|
||||
*
|
||||
* @param flags which SHOULD always have all of these flags:
|
||||
*
|
||||
* - `CLONE_THREAD`
|
||||
* - `CLONE_VM`
|
||||
* - `CLONE_FS`
|
||||
* - `CLONE_FILES`
|
||||
* - `CLONE_SIGHAND`
|
||||
* - `CLONE_SYSVSEM`
|
||||
*
|
||||
* This system call wrapper is intended for threads, and as such, we
|
||||
* won't polyfill Linux's ability to simulate unrelated calls (e.g.
|
||||
* fork, vfork) via clone() on other platforms. Please just call
|
||||
* fork() and vfork() when that's what you want.
|
||||
*
|
||||
* Your `flags` may also optionally also additionally bitwise-OR any
|
||||
* combination of the following additional flags:
|
||||
*
|
||||
* - `CLONE_CHILD_SETTID` must be specified if you intend to set the
|
||||
* `ctid` argument, which will updated with the child tid once the
|
||||
* child has started.
|
||||
*
|
||||
* - `CLONE_PARENT_SETTID` must be specified if you intend to set
|
||||
* the `ptid` argument, and it is updated at the most opportune
|
||||
* moment. On all platforms except XNU x86, this happens before
|
||||
* clone() returns. But since it might not be available yet you
|
||||
* need to use pthread_getunique_np() to obtain it.
|
||||
*
|
||||
* - `CLONE_CHILD_CLEARTID` causes `*ctid = 0` upon child thread
|
||||
* termination. This is used to implement join so that the parent
|
||||
* may know when it's safe to free the child's stack memory, and
|
||||
* as such, is guaranteed to happen AFTER the child thread has
|
||||
* either terminated or has finished using its stack memory
|
||||
*
|
||||
* - `CLONE_SETTLS` is needed if you intend to specify the `tls`
|
||||
* argument, which after thread creation may be accessed using
|
||||
* __get_tls(). Doing this means that `errno`, gettid(), etc.
|
||||
* correctly work. Caveat emptor if you choose not to do this.
|
||||
*
|
||||
* @param arg is passed as an argument to `func` in the child thread
|
||||
* @param tls may be used to set the thread local storage segment;
|
||||
* this parameter is ignored if `CLONE_SETTLS` is not set
|
||||
* @param ctid lets the child receive its thread id without having to
|
||||
* call gettid() and is ignored if `CLONE_CHILD_SETTID` isn't set
|
||||
* @return 0 on success, or errno on errno
|
||||
* If you use clone() you're on your own.
|
||||
*/
|
||||
errno_t clone(void *func, void *stk, size_t stksz, int flags, void *arg,
|
||||
void *ptid, void *tls, void *ctid) {
|
||||
|
|
@ -757,33 +584,25 @@ errno_t clone(void *func, void *stk, size_t stksz, int flags, void *arg,
|
|||
|
||||
atomic_fetch_add(&_pthread_count, 1);
|
||||
|
||||
if (!func) {
|
||||
err = EINVAL;
|
||||
} else if (IsLinux()) {
|
||||
if (IsLinux()) {
|
||||
err = CloneLinux(func, stk, stksz, flags, arg, tls, ptid, ctid);
|
||||
} else if (!IsTiny() &&
|
||||
(flags & ~(CLONE_SETTLS | CLONE_PARENT_SETTID |
|
||||
CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) !=
|
||||
(CLONE_THREAD | CLONE_VM | CLONE_FS | CLONE_FILES |
|
||||
CLONE_SIGHAND | CLONE_SYSVSEM)) {
|
||||
err = EINVAL;
|
||||
} else if (IsXnu()) {
|
||||
#ifdef __x86_64__
|
||||
err = CloneXnu(func, stk, stksz, flags, arg, tls, ptid, ctid);
|
||||
#if defined(__x86_64__)
|
||||
err = CloneXnu(func, stk, stksz, arg, tls, ptid, ctid);
|
||||
#elif defined(__aarch64__)
|
||||
err = CloneSilicon(func, stk, stksz, flags, arg, tls, ptid, ctid);
|
||||
err = CloneSilicon(func, stk, stksz, arg, tls, ptid, ctid);
|
||||
#else
|
||||
#error "unsupported architecture"
|
||||
#endif
|
||||
} else if (IsFreebsd()) {
|
||||
err = CloneFreebsd(func, stk, stksz, flags, arg, tls, ptid, ctid);
|
||||
#ifdef __x86_64__
|
||||
} else if (IsNetbsd()) {
|
||||
err = CloneNetbsd(func, stk, stksz, flags, arg, tls, ptid, ctid);
|
||||
} else if (IsOpenbsd()) {
|
||||
err = CloneOpenbsd(func, stk, stksz, flags, arg, tls, ptid, ctid);
|
||||
err = CloneFreebsd(func, stk, stksz, arg, tls, ptid, ctid);
|
||||
#if defined(__x86_64__)
|
||||
} else if (IsWindows()) {
|
||||
err = CloneWindows(func, stk, stksz, flags, arg, tls, ptid, ctid);
|
||||
err = CloneWindows(func, stk, stksz, arg, tls, ptid, ctid);
|
||||
} else if (IsNetbsd()) {
|
||||
err = CloneNetbsd(func, stk, stksz, arg, tls, ptid, ctid);
|
||||
} else if (IsOpenbsd()) {
|
||||
err = CloneOpenbsd(func, stk, stksz, arg, tls, ptid, ctid);
|
||||
#endif /* __x86_64__ */
|
||||
} else {
|
||||
err = ENOSYS;
|
||||
|
|
@ -793,7 +612,7 @@ errno_t clone(void *func, void *stk, size_t stksz, int flags, void *arg,
|
|||
err = EAGAIN;
|
||||
|
||||
if (err)
|
||||
unassert(atomic_fetch_sub(&_pthread_count, 1) > 1);
|
||||
atomic_fetch_sub(&_pthread_count, 1);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -22,18 +22,25 @@
|
|||
ftrace_hook:
|
||||
#ifdef __x86_64__
|
||||
|
||||
// We need to save saved registers because we have some functions
|
||||
// like __errno_location which can be called from an inline asm()
|
||||
// statement. It's nice to have the flexibility anyway.
|
||||
// save argument registers
|
||||
// we save %rax because __gc() takes it as an argument.
|
||||
// we save %r10 because it's used as a syscall argument.
|
||||
|
||||
cmpl $0,__ftrace(%rip)
|
||||
jle 1f
|
||||
push %rbp
|
||||
mov %rsp,%rbp
|
||||
and $-16,%rsp
|
||||
sub $256,%rsp
|
||||
sub $128,%rsp
|
||||
movdqu %xmm0,-0x80(%rbp)
|
||||
movdqu %xmm1,-0x70(%rbp)
|
||||
movdqu %xmm2,-0x60(%rbp)
|
||||
movdqu %xmm3,-0x50(%rbp)
|
||||
movdqu %xmm4,-0x40(%rbp)
|
||||
movdqu %xmm5,-0x30(%rbp)
|
||||
movdqu %xmm6,-0x20(%rbp)
|
||||
movdqu %xmm7,-0x10(%rbp)
|
||||
push %rax
|
||||
push %rbx
|
||||
push %rcx
|
||||
push %rdx
|
||||
push %rdi
|
||||
|
|
@ -41,19 +48,15 @@ ftrace_hook:
|
|||
push %r8
|
||||
push %r9
|
||||
push %r10
|
||||
push %r11
|
||||
push %r12
|
||||
push %r13
|
||||
push %r14
|
||||
push %r15
|
||||
call __xmm_save
|
||||
call ftracer
|
||||
call __xmm_load
|
||||
pop %r15
|
||||
pop %r14
|
||||
pop %r13
|
||||
pop %r12
|
||||
pop %r11
|
||||
movdqu -0x80(%rbp),%xmm0
|
||||
movdqu -0x70(%rbp),%xmm1
|
||||
movdqu -0x60(%rbp),%xmm2
|
||||
movdqu -0x50(%rbp),%xmm3
|
||||
movdqu -0x40(%rbp),%xmm4
|
||||
movdqu -0x30(%rbp),%xmm5
|
||||
movdqu -0x20(%rbp),%xmm6
|
||||
movdqu -0x10(%rbp),%xmm7
|
||||
pop %r10
|
||||
pop %r9
|
||||
pop %r8
|
||||
|
|
@ -61,7 +64,6 @@ ftrace_hook:
|
|||
pop %rdi
|
||||
pop %rdx
|
||||
pop %rcx
|
||||
pop %rbx
|
||||
pop %rax
|
||||
leave
|
||||
1: ret
|
||||
|
|
|
|||
|
|
@ -31,11 +31,7 @@
|
|||
#include "libc/thread/tls.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.
|
||||
* @fileoverview plain-text function call logging
|
||||
*/
|
||||
|
||||
#define MAX_NESTING 512
|
||||
|
|
@ -49,7 +45,7 @@
|
|||
static struct CosmoFtrace g_ftrace;
|
||||
|
||||
__funline int GetNestingLevelImpl(struct StackFrame *frame) {
|
||||
int nesting = -2;
|
||||
int nesting = -1;
|
||||
while (frame && !kisdangerous(frame)) {
|
||||
++nesting;
|
||||
frame = frame->next;
|
||||
|
|
@ -82,38 +78,63 @@ privileged void ftracer(void) {
|
|||
struct StackFrame *sf;
|
||||
struct CosmoFtrace *ft;
|
||||
struct PosixThread *pt;
|
||||
|
||||
// get interesting values
|
||||
sf = __builtin_frame_address(0);
|
||||
st = (uintptr_t)__argv - sizeof(uintptr_t);
|
||||
if (__ftrace <= 0)
|
||||
return;
|
||||
|
||||
// determine top of stack
|
||||
// main thread won't consider kernel provided argblock
|
||||
if (__tls_enabled) {
|
||||
tib = __get_tls_privileged();
|
||||
if (tib->tib_ftrace <= 0)
|
||||
return;
|
||||
ft = &tib->tib_ftracer;
|
||||
if ((char *)sf >= tib->tib_sigstack_addr &&
|
||||
(char *)sf <= tib->tib_sigstack_addr + tib->tib_sigstack_size) {
|
||||
st = (uintptr_t)tib->tib_sigstack_addr + tib->tib_sigstack_size;
|
||||
} else if ((pt = (struct PosixThread *)tib->tib_pthread) &&
|
||||
pt->pt_attr.__stacksize) {
|
||||
st = (uintptr_t)pt->pt_attr.__stackaddr + pt->pt_attr.__stacksize;
|
||||
pt = (struct PosixThread *)tib->tib_pthread;
|
||||
if (pt != &_pthread_static) {
|
||||
if ((char *)sf >= tib->tib_sigstack_addr &&
|
||||
(char *)sf <= tib->tib_sigstack_addr + tib->tib_sigstack_size) {
|
||||
st = (uintptr_t)tib->tib_sigstack_addr + tib->tib_sigstack_size;
|
||||
} else if (pt && pt->pt_attr.__stacksize) {
|
||||
st = (uintptr_t)pt->pt_attr.__stackaddr + pt->pt_attr.__stacksize;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
ft = &g_ftrace;
|
||||
}
|
||||
stackuse = st - (intptr_t)sf;
|
||||
if (_cmpxchg(&ft->ft_once, false, true)) {
|
||||
|
||||
// estimate stack pointer of hooked function
|
||||
uintptr_t usp = (uintptr_t)sf;
|
||||
usp += sizeof(struct StackFrame); // overhead of this function
|
||||
#if defined(__x86_64__)
|
||||
usp += 8; // ftrace_hook() stack aligning
|
||||
usp += 8 * 8; // ftrace_hook() pushed 8x regs
|
||||
usp += 8 * 16; // ftrace_hook() pushed 8x xmms
|
||||
#elif defined(__aarch64__)
|
||||
usp += 384; // overhead of ftrace_hook()
|
||||
#else
|
||||
#error "unsupported architecture"
|
||||
#endif
|
||||
|
||||
// determine how much stack hooked function is using
|
||||
stackuse = st - usp;
|
||||
|
||||
// log function call
|
||||
//
|
||||
// FUN $PID $TID $STARTNANOS $STACKUSE $SYMBOL
|
||||
//
|
||||
if (!ft->ft_once) {
|
||||
ft->ft_lastaddr = -1;
|
||||
ft->ft_skew = GetNestingLevelImpl(sf);
|
||||
ft->ft_once = true;
|
||||
}
|
||||
if (_cmpxchg(&ft->ft_noreentry, false, true)) {
|
||||
sf = sf->next;
|
||||
fn = sf->addr + DETOUR_SKEW;
|
||||
if (fn != ft->ft_lastaddr) {
|
||||
kprintf("%rFUN %6P %6H %'18T %'*ld %*s%t\n", ftrace_stackdigs, stackuse,
|
||||
GetNestingLevel(ft, sf) * 2, "", fn);
|
||||
ft->ft_lastaddr = fn;
|
||||
}
|
||||
ft->ft_noreentry = false;
|
||||
sf = sf->next;
|
||||
fn = sf->addr + DETOUR_SKEW;
|
||||
if (fn != ft->ft_lastaddr) {
|
||||
kprintf("%rFUN %6P %6H %'18T %'*ld %*s%t\n", ftrace_stackdigs, stackuse,
|
||||
GetNestingLevel(ft, sf) * 2, "", fn);
|
||||
ft->ft_lastaddr = fn;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -84,7 +84,8 @@ o/$(MODE)/libc/sysv/sysret.o: private \
|
|||
CFLAGS += \
|
||||
-ffreestanding \
|
||||
-fno-stack-protector \
|
||||
-fno-sanitize=all
|
||||
-fno-sanitize=all \
|
||||
-mgeneral-regs-only
|
||||
|
||||
ifeq ($(ARCH),aarch64)
|
||||
o/$(MODE)/libc/sysv/sysv.o: private \
|
||||
|
|
|
|||
|
|
@ -35,8 +35,10 @@ errno_t __errno;
|
|||
|
||||
/**
|
||||
* Returns address of `errno` variable.
|
||||
*
|
||||
* This function promises to not clobber argument registers.
|
||||
*/
|
||||
errno_t *__errno_location(void) {
|
||||
nocallersavedregisters errno_t *__errno_location(void) {
|
||||
if (__tls_enabled) {
|
||||
return &__get_tls()->tib_errno;
|
||||
} else {
|
||||
|
|
|
|||
|
|
@ -187,7 +187,7 @@ systemfive_error:
|
|||
#endif
|
||||
systemfive_errno:
|
||||
xchg %eax,%ecx
|
||||
.errno
|
||||
call __errno_location
|
||||
mov %ecx,(%rax) // normalize to c library convention
|
||||
push $-1 // negative one is only error result
|
||||
pop %rax // the push pop is to save code size
|
||||
|
|
|
|||
|
|
@ -44,7 +44,7 @@
|
|||
|
||||
#define STACK_SIZE 65536
|
||||
|
||||
static textwindows dontinstrument uint32_t __itimer_worker(void *arg) {
|
||||
textwindows dontinstrument static uint32_t __itimer_worker(void *arg) {
|
||||
struct CosmoTib tls;
|
||||
char *sp = __builtin_frame_address(0);
|
||||
__bootstrap_tls(&tls, sp);
|
||||
|
|
@ -87,7 +87,7 @@ static textwindows dontinstrument uint32_t __itimer_worker(void *arg) {
|
|||
return 0;
|
||||
}
|
||||
|
||||
static textwindows void __itimer_setup(void) {
|
||||
textwindows static void __itimer_setup(void) {
|
||||
__itimer.thread = CreateThread(0, STACK_SIZE, __itimer_worker, 0,
|
||||
kNtStackSizeParamIsAReservation, 0);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -151,7 +151,7 @@ void _pthread_decimate(enum PosixThreadStatus threshold) {
|
|||
}
|
||||
}
|
||||
|
||||
dontinstrument static int PosixThread(void *arg, int tid) {
|
||||
static int PosixThread(void *arg) {
|
||||
struct PosixThread *pt = arg;
|
||||
|
||||
// setup scheduling
|
||||
|
|
@ -162,11 +162,11 @@ dontinstrument static int PosixThread(void *arg, int tid) {
|
|||
|
||||
// setup signal stack
|
||||
if (pt->pt_attr.__sigaltstacksize) {
|
||||
struct sigaltstack ss;
|
||||
ss.ss_sp = pt->pt_attr.__sigaltstackaddr;
|
||||
ss.ss_size = pt->pt_attr.__sigaltstacksize;
|
||||
ss.ss_flags = 0;
|
||||
unassert(!sigaltstack(&ss, 0));
|
||||
struct sigaltstack *ss = alloca(sizeof(struct sigaltstack));
|
||||
ss->ss_sp = pt->pt_attr.__sigaltstackaddr;
|
||||
ss->ss_size = pt->pt_attr.__sigaltstacksize;
|
||||
ss->ss_flags = 0;
|
||||
unassert(!sigaltstack(ss, 0));
|
||||
}
|
||||
|
||||
// set long jump handler so pthread_exit can bring control back here
|
||||
|
|
|
|||
|
|
@ -10,7 +10,6 @@ COSMOPOLITAN_C_START_
|
|||
|
||||
struct CosmoFtrace { /* 16 */
|
||||
char ft_once; /* 0 */
|
||||
char ft_noreentry; /* 1 */
|
||||
int ft_skew; /* 4 */
|
||||
int64_t ft_lastaddr; /* 8 */
|
||||
};
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue