Here is an updated diff that addresses the following points mentioned by
kettenis@:
- syscall fallback was implemented from the first version
- the low resolution clock argument, I think, was shown not to be a
problem
- TSC and HPET alternatives were discussed, and if we decide to add
them, I think that should be done by a separate diff
- I think this version does proper wrapping (at least according to the
README); of course Philip's input would be greatly appreciated!
- I will export the ELF bits after the diff gets in commitable shape
- proper auxv number instead of 2004: I see that NetBSD
has taken 2004 for AT_SUN_LDELF; should I take 2015 which seems the
next one free?
Hopefully this version also fixes the init bug solene@ was seeing.
Paul
diff --git lib/libc/asr/asr.c lib/libc/asr/asr.c
index cd056c85719..2b25d49f32a 100644
--- lib/libc/asr/asr.c
+++ lib/libc/asr/asr.c
@@ -196,11 +196,11 @@ poll_intrsafe(struct pollfd *fds, nfds_t nfds, int
timeout)
struct timespec pollstart, pollend, elapsed;
int r;
- if (clock_gettime(CLOCK_MONOTONIC, &pollstart))
+ if (WRAP(clock_gettime)(CLOCK_MONOTONIC, &pollstart))
return -1;
while ((r = poll(fds, 1, timeout)) == -1 && errno == EINTR) {
- if (clock_gettime(CLOCK_MONOTONIC, &pollend))
+ if (WRAP(clock_gettime)(CLOCK_MONOTONIC, &pollend))
return -1;
timespecsub(&pollend, &pollstart, &elapsed);
timeout -= elapsed.tv_sec * 1000 + elapsed.tv_nsec / 1000000;
@@ -418,7 +418,7 @@ asr_check_reload(struct asr *asr)
asr->a_rtime = 0;
}
- if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1)
+ if (WRAP(clock_gettime)(CLOCK_MONOTONIC, &ts) == -1)
return;
if ((ts.tv_sec - asr->a_rtime) < RELOAD_DELAY && asr->a_rtime != 0)
diff --git lib/libc/crypt/bcrypt.c lib/libc/crypt/bcrypt.c
index 82de8fa33b7..63edde9072e 100644
--- lib/libc/crypt/bcrypt.c
+++ lib/libc/crypt/bcrypt.c
@@ -31,6 +31,7 @@
*
*/
+#include <sys/time.h>
#include <sys/types.h>
#include <blf.h>
#include <ctype.h>
@@ -248,9 +249,9 @@ _bcrypt_autorounds(void)
char buf[_PASSWORD_LEN];
int duration;
- clock_gettime(CLOCK_THREAD_CPUTIME_ID, &before);
+ WRAP(clock_gettime)(CLOCK_THREAD_CPUTIME_ID, &before);
bcrypt_newhash("testpassword", r, buf, sizeof(buf));
- clock_gettime(CLOCK_THREAD_CPUTIME_ID, &after);
+ WRAP(clock_gettime)(CLOCK_THREAD_CPUTIME_ID, &after);
duration = after.tv_sec - before.tv_sec;
duration *= 1000000;
diff --git lib/libc/dlfcn/dlfcn_stubs.c lib/libc/dlfcn/dlfcn_stubs.c
index 78d728f66cb..7b75ec4582a 100644
--- lib/libc/dlfcn/dlfcn_stubs.c
+++ lib/libc/dlfcn/dlfcn_stubs.c
@@ -80,10 +80,14 @@ dlerror(void)
return "Wrong dl symbols!\n";
}
+extern void *elf_aux_timekeep;
+extern int find_timekeep(void);
+
int
dl_iterate_phdr(int (*callback)(struct dl_phdr_info *, size_t, void *),
void *data)
{
+ find_timekeep();
if (_dl_cb != NULL && _dl_cb->dl_iterate_phdr != NULL)
return _dl_cb->dl_iterate_phdr(callback, data);
#ifndef PIC
diff --git lib/libc/dlfcn/init.c lib/libc/dlfcn/init.c
index 270f54aada5..0238bb50b0b 100644
--- lib/libc/dlfcn/init.c
+++ lib/libc/dlfcn/init.c
@@ -69,6 +69,9 @@ extern Elf_Ehdr __executable_start[] __attribute__((weak));
/* provide definitions for these */
const dl_cb *_dl_cb __relro = NULL;
+extern void *elf_aux_timekeep;
+extern int find_timekeep(void);
+
void _libc_preinit(int, char **, char **, dl_cb_cb *) __dso_hidden;
void
_libc_preinit(int argc, char **argv, char **envp, dl_cb_cb *cb)
@@ -126,6 +129,7 @@ _libc_preinit(int argc, char **argv, char **envp, dl_cb_cb
*cb)
if (cb == NULL)
setup_static_tib(phdr, phnum);
#endif /* !PIC */
+ find_timekeep();
}
/* ARM just had to be different... */
diff --git lib/libc/gen/times.c lib/libc/gen/times.c
index 02e4dd44b5c..36841810d1b 100644
--- lib/libc/gen/times.c
+++ lib/libc/gen/times.c
@@ -52,7 +52,7 @@ times(struct tms *tp)
return ((clock_t)-1);
tp->tms_cutime = CONVTCK(ru.ru_utime);
tp->tms_cstime = CONVTCK(ru.ru_stime);
- if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1)
+ if (WRAP(clock_gettime)(CLOCK_MONOTONIC, &ts) == -1)
return ((clock_t)-1);
return (ts.tv_sec * CLK_TCK + ts.tv_nsec / (1000000000 / CLK_TCK));
}
diff --git lib/libc/gen/timespec_get.c lib/libc/gen/timespec_get.c
index 520a5954025..b2bdcd15a4d 100644
--- lib/libc/gen/timespec_get.c
+++ lib/libc/gen/timespec_get.c
@@ -30,6 +30,7 @@
* POSSIBILITY OF SUCH DAMAGE.
*/
+#include <sys/time.h>
#include <time.h>
int
@@ -37,7 +38,7 @@ timespec_get(struct timespec *ts, int base)
{
switch (base) {
case TIME_UTC:
- if (clock_gettime(CLOCK_REALTIME, ts) == -1)
+ if (WRAP(clock_gettime)(CLOCK_REALTIME, ts) == -1)
return 0;
break;
default:
diff --git lib/libc/hidden/sys/time.h lib/libc/hidden/sys/time.h
index ed112320fa2..7f59daa0107 100644
--- lib/libc/hidden/sys/time.h
+++ lib/libc/hidden/sys/time.h
@@ -22,6 +22,7 @@
PROTO_NORMAL(adjfreq);
PROTO_NORMAL(adjtime);
+PROTO_WRAP(clock_gettime);
PROTO_NORMAL(futimes);
PROTO_NORMAL(getitimer);
PROTO_NORMAL(gettimeofday);
diff --git lib/libc/net/res_random.c lib/libc/net/res_random.c
index 763e420bb88..9babb28470a 100644
--- lib/libc/net/res_random.c
+++ lib/libc/net/res_random.c
@@ -219,7 +219,7 @@ res_initid(void)
if (ru_prf != NULL)
arc4random_buf(ru_prf, sizeof(*ru_prf));
- clock_gettime(CLOCK_MONOTONIC, &ts);
+ WRAP(clock_gettime)(CLOCK_MONOTONIC, &ts);
ru_reseed = ts.tv_sec + RU_OUT;
ru_msb = ru_msb == 0x8000 ? 0 : 0x8000;
}
@@ -232,7 +232,7 @@ __res_randomid(void)
u_int r;
static void *randomid_mutex;
- clock_gettime(CLOCK_MONOTONIC, &ts);
+ WRAP(clock_gettime)(CLOCK_MONOTONIC, &ts);
pid = getpid();
_MUTEX_LOCK(&randomid_mutex);
diff --git lib/libc/rpc/clnt_tcp.c lib/libc/rpc/clnt_tcp.c
index 8e6ef515b0e..927b4bf2028 100644
--- lib/libc/rpc/clnt_tcp.c
+++ lib/libc/rpc/clnt_tcp.c
@@ -393,12 +393,12 @@ readtcp(struct ct_data *ct, caddr_t buf, int len)
pfd[0].events = POLLIN;
TIMEVAL_TO_TIMESPEC(&ct->ct_wait, &wait);
delta = wait;
- clock_gettime(CLOCK_MONOTONIC, &start);
+ WRAP(clock_gettime)(CLOCK_MONOTONIC, &start);
for (;;) {
r = ppoll(pfd, 1, &delta, NULL);
save_errno = errno;
- clock_gettime(CLOCK_MONOTONIC, &after);
+ WRAP(clock_gettime)(CLOCK_MONOTONIC, &after);
timespecsub(&start, &after, &duration);
timespecsub(&wait, &duration, &delta);
if (delta.tv_sec < 0 || !timespecisset(&delta))
diff --git lib/libc/shlib_version lib/libc/shlib_version
index 06f98b01084..5fb0770494f 100644
--- lib/libc/shlib_version
+++ lib/libc/shlib_version
@@ -1,4 +1,4 @@
major=96
-minor=0
+minor=1
# note: If changes were made to include/thread_private.h or if system calls
# were added/changed then librthread/shlib_version must also be updated.
diff --git lib/libc/sys/Makefile.inc lib/libc/sys/Makefile.inc
index 34769576ced..d0b5dd1bdcd 100644
--- lib/libc/sys/Makefile.inc
+++ lib/libc/sys/Makefile.inc
@@ -12,7 +12,8 @@ SRCS+= Ovfork.S brk.S ${CERROR} \
# glue to offer userland wrappers for some syscalls
SRCS+= posix_madvise.c pthread_sigmask.c \
- w_fork.c w_sigaction.c w_sigprocmask.c w_sigsuspend.c w_vfork.c
+ w_fork.c w_sigaction.c w_sigprocmask.c w_sigsuspend.c w_vfork.c \
+ w_clock_gettime.c
# glue for compat with old syscall interfaces.
SRCS+= ftruncate.c lseek.c mquery.c mmap.c ptrace.c semctl.c truncate.c \
@@ -43,7 +44,7 @@ SRCS+= ${CANCEL:%=w_%.c} w_pread.c w_preadv.c
w_pwrite.c w_pwritev.c
ASM= __semctl.o __syscall.o __thrsigdivert.o \
access.o acct.o adjfreq.o adjtime.o \
bind.o chdir.o chflags.o chflagsat.o chmod.o chown.o chroot.o \
- clock_getres.o clock_gettime.o clock_settime.o \
+ clock_getres.o clock_settime.o \
dup.o dup2.o dup3.o \
execve.o \
faccessat.o fchdir.o fchflags.o fchmod.o fchmodat.o fchown.o \
@@ -109,7 +110,7 @@ PPSEUDO_NOERR=${PSEUDO_NOERR:.o=.po}
SPSEUDO_NOERR=${PSEUDO_NOERR:.o=.so}
DPSEUDO_NOERR=${PSEUDO_NOERR:.o=.do}
-HIDDEN= ___realpath.o ___getcwd.o fork.o sigaction.o _ptrace.o ${CANCEL:=.o}
+HIDDEN= ___realpath.o ___getcwd.o fork.o sigaction.o _ptrace.o ${CANCEL:=.o}
clock_gettime.o
PHIDDEN=${HIDDEN:.o=.po}
SHIDDEN=${HIDDEN:.o=.so}
DHIDDEN=${HIDDEN:.o=.do}
diff --git lib/libc/sys/w_clock_gettime.c lib/libc/sys/w_clock_gettime.c
new file mode 100644
index 00000000000..04850fbda32
--- /dev/null
+++ lib/libc/sys/w_clock_gettime.c
@@ -0,0 +1,109 @@
+/* $OpenBSD$ */
+/*
+ * Copyright (c) 2020 Paul Irofti <p...@irofti.net>
+ *
+ * Permission to use, copy, modify, and 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 <stdlib.h>
+#include <time.h>
+#include <err.h>
+
+#include <sys/timekeep.h>
+
+void *elf_aux_timekeep;
+
+
+/*
+ * Needed exec_elf implementation.
+ * To be exposed by the kernel later if needed.
+ */
+
+#include <sys/exec_elf.h>
+
+typedef struct {
+ uint32_t au_id; /* 32-bit id */
+ uint64_t au_v; /* 64-bit value */
+} AuxInfo;
+
+enum AuxID {
+ AUX_null = 0,
+ AUX_ignore = 1,
+ AUX_execfd = 2,
+ AUX_phdr = 3, /* &phdr[0] */
+ AUX_phent = 4, /* sizeof(phdr[0]) */
+ AUX_phnum = 5, /* # phdr entries */
+ AUX_pagesz = 6, /* PAGESIZE */
+ AUX_base = 7, /* ld.so base addr */
+ AUX_flags = 8, /* processor flags */
+ AUX_entry = 9, /* a.out entry */
+ AUX_sun_uid = 2000, /* euid */
+ AUX_sun_ruid = 2001, /* ruid */
+ AUX_sun_gid = 2002, /* egid */
+ AUX_sun_rgid = 2003, /* rgid */
+ AUX_openbsd_timekeep = 2004, /* userland clock_gettime */
+};
+
+
+/*
+ * Helper functions.
+ */
+
+int
+find_timekeep(void)
+{
+ Elf_Addr *stackp;
+ AuxInfo *auxv;
+
+ stackp = (Elf_Addr *)environ;
+ while (*stackp++) ; /* pass environment */
+
+ /* look-up timekeep auxv */
+ for (auxv = (AuxInfo *)stackp; auxv->au_id != AUX_null; auxv++)
+ if (auxv->au_id == AUX_openbsd_timekeep) {
+ elf_aux_timekeep = (void *)auxv->au_v;
+ return 0;
+ }
+
+ warnx("%s", "Could not find auxv!");
+ return -1;
+}
+
+int
+WRAP(clock_gettime)(clockid_t clock_id, struct timespec *tp)
+{
+ struct timekeep *timekeep;
+
+ if (elf_aux_timekeep == NULL && find_timekeep())
+ return clock_gettime(clock_id, tp);
+ timekeep = elf_aux_timekeep;
+
+ switch (clock_id) {
+ case CLOCK_REALTIME:
+ *tp = timekeep->tp_realtime;
+ break;
+ case CLOCK_UPTIME:
+ *tp = timekeep->tp_uptime;
+ break;
+ case CLOCK_MONOTONIC:
+ *tp = timekeep->tp_monotonic;
+ break;
+ case CLOCK_BOOTTIME:
+ *tp = timekeep->tp_boottime;
+ break;
+ default:
+ return clock_gettime(clock_id, tp);
+ }
+ return 0;
+}
+DEF_WRAP(clock_gettime);
diff --git sys/kern/exec_elf.c sys/kern/exec_elf.c
index 9b5b8eb3acf..59bc923a6fb 100644
--- sys/kern/exec_elf.c
+++ sys/kern/exec_elf.c
@@ -124,7 +124,7 @@ extern char *syscallnames[];
/*
* How many entries are in the AuxInfo array we pass to the process?
*/
-#define ELF_AUX_ENTRIES 8
+#define ELF_AUX_ENTRIES 9
/*
* This is the OpenBSD ELF emul
@@ -860,6 +860,10 @@ exec_elf_fixup(struct proc *p, struct exec_package *epp)
a->au_v = ap->arg_entry;
a++;
+ a->au_id = AUX_openbsd_timekeep;
+ a->au_v = p->p_p->ps_timekeep;
+ a++;
+
a->au_id = AUX_null;
a->au_v = 0;
a++;
diff --git sys/kern/kern_exec.c sys/kern/kern_exec.c
index 20480c2fc28..2496458fde1 100644
--- sys/kern/kern_exec.c
+++ sys/kern/kern_exec.c
@@ -64,6 +64,11 @@
#include <uvm/uvm_extern.h>
#include <machine/tcb.h>
+#include <sys/timekeep.h>
+
+struct uvm_object *timekeep_object;
+struct timekeep* timekeep;
+
void unveil_destroy(struct process *ps);
const struct kmem_va_mode kv_exec = {
@@ -76,6 +81,11 @@ const struct kmem_va_mode kv_exec = {
*/
int exec_sigcode_map(struct process *, struct emul *);
+/*
+ * Map the shared timekeep page.
+ */
+int exec_timekeep_map(struct process *);
+
/*
* If non-zero, stackgap_random specifies the upper limit of the random gap
size
* added to the fixed stack position. Must be n^2.
@@ -684,6 +694,9 @@ sys_execve(struct proc *p, void *v, register_t *retval)
/* map the process's signal trampoline code */
if (exec_sigcode_map(pr, pack.ep_emul))
goto free_pack_abort;
+ /* map the process's timekeep page */
+ if (exec_timekeep_map(pr))
+ goto free_pack_abort;
#ifdef __HAVE_EXEC_MD_MAP
/* perform md specific mappings that process might need */
@@ -863,3 +876,38 @@ exec_sigcode_map(struct process *pr, struct emul *e)
return (0);
}
+
+int exec_timekeep_map(struct process *pr)
+{
+ size_t timekeep_sz = sizeof(struct timekeep);
+
+ /*
+ * Similar to the sigcode object, except that there is a single timekeep
+ * object, and not one per emulation.
+ */
+ if (timekeep_object == NULL) {
+ vaddr_t va;
+
+ timekeep_object = uao_create(timekeep_sz, 0);
+ uao_reference(timekeep_object);
+
+ if (uvm_map(kernel_map, &va, round_page(timekeep_sz),
timekeep_object,
+ 0, 0, UVM_MAPFLAG(PROT_READ | PROT_WRITE, PROT_READ |
PROT_WRITE,
+ MAP_INHERIT_SHARE, MADV_RANDOM, 0))) {
+ uao_detach(timekeep_object);
+ return (ENOMEM);
+ }
+
+ timekeep = (struct timekeep *)va;
+ }
+
+ uao_reference(timekeep_object);
+ if (uvm_map(&pr->ps_vmspace->vm_map, &pr->ps_timekeep,
round_page(timekeep_sz),
+ timekeep_object, 0, 0, UVM_MAPFLAG(PROT_READ, PROT_READ,
+ MAP_INHERIT_COPY, MADV_RANDOM, 0))) {
+ uao_detach(timekeep_object);
+ return (ENOMEM);
+ }
+
+ return (0);
+}
diff --git sys/kern/kern_tc.c sys/kern/kern_tc.c
index bcf8f689625..007f1116c4f 100644
--- sys/kern/kern_tc.c
+++ sys/kern/kern_tc.c
@@ -35,6 +35,7 @@
#include <sys/queue.h>
#include <sys/malloc.h>
#include <dev/rndvar.h>
+#include <sys/timekeep.h>
/*
* A large step happens on boot. This constant detects such steps.
@@ -209,6 +210,31 @@ microuptime(struct timeval *tvp)
BINTIME_TO_TIMEVAL(&bt, tvp);
}
+void
+tc_clock_gettime(void)
+{
+ struct bintime bt;
+
+ if (timekeep == NULL)
+ return;
+
+ /* CLOCK_REALTIME */
+ nanotime(&timekeep->tp_realtime);
+
+ /* CLOCK_UPTIME */
+ binuptime(&bt);
+ bintimesub(&bt, &naptime, &bt);
+ BINTIME_TO_TIMESPEC(&bt, &timekeep->tp_uptime);
+
+ /* CLOCK_MONOTONIC */
+ nanouptime(&timekeep->tp_monotonic);
+
+ /* CLOCK_BOOTTIME */
+ timekeep->tp_boottime = timekeep->tp_monotonic;
+
+ return;
+}
+
void
bintime(struct bintime *bt)
{
@@ -613,6 +639,8 @@ tc_windup(struct bintime *new_boottime, struct bintime
*new_offset,
time_uptime = th->th_offset.sec;
membar_producer();
timehands = th;
+
+ tc_clock_gettime();
}
/* Report or change the active timecounter hardware. */
diff --git sys/sys/exec_elf.h sys/sys/exec_elf.h
index a40e0510273..f55b75f1e84 100644
--- sys/sys/exec_elf.h
+++ sys/sys/exec_elf.h
@@ -691,7 +691,8 @@ enum AuxID {
AUX_sun_uid = 2000, /* euid */
AUX_sun_ruid = 2001, /* ruid */
AUX_sun_gid = 2002, /* egid */
- AUX_sun_rgid = 2003 /* rgid */
+ AUX_sun_rgid = 2003, /* rgid */
+ AUX_openbsd_timekeep = 2004, /* userland clock_gettime */
};
struct elf_args {
diff --git sys/sys/proc.h sys/sys/proc.h
index 357c0c0d52c..93a79a220db 100644
--- sys/sys/proc.h
+++ sys/sys/proc.h
@@ -248,6 +248,8 @@ struct process {
u_int ps_rtableid; /* Process routing table/domain. */
char ps_nice; /* Process "nice" value. */
+ vaddr_t ps_timekeep; /* User pointer to timekeep */
+
struct uprof { /* profile arguments */
caddr_t pr_base; /* buffer base */
size_t pr_size; /* buffer size */
diff --git sys/sys/timekeep.h sys/sys/timekeep.h
new file mode 100644
index 00000000000..bad25185bc4
--- /dev/null
+++ sys/sys/timekeep.h
@@ -0,0 +1,37 @@
+/* $OpenBSD$ */
+/*
+ * Copyright (c) 2020 Paul Irofti <p...@irofti.net>
+ *
+ * Permission to use, copy, modify, and 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.
+ */
+
+#ifndef _SYS_TIMEKEEP_H_
+#define _SYS_TIMEKEEP_H_
+
+#include <sys/time.h>
+
+struct timekeep {
+ struct timespec tp_realtime;
+ struct timespec tp_uptime;
+ struct timespec tp_monotonic;
+ struct timespec tp_boottime;
+};
+
+#if defined(_KERNEL)
+#include <uvm/uvm_extern.h>
+
+extern struct uvm_object *timekeep_object;
+extern struct timekeep *timekeep;
+#endif
+
+#endif /* _SYS_TIMEKEEP_H_ */
