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3764dc7b41cb4923f5da99bd2fe1db0470043adf
android_development/ndk/sources/android/libportable/arch-mips/syscall.c
Pete Delaney c684613e19 [MIPS] Added support for file descriptor related system calls. 
Specifically these functions are now supported:
    signalfd4(), eventfd(), timerfd_create(),
    pipe(), and inotify_init1()

Modified syscall_portable() to call signalfd4_portable(),
eventfd_portable(), eventfd2_portable(), and timerfd_create().
These system calls enable the read system calls to access
kernel data structures.

The signalfd4() enables read to return a signalfd_siginfo structure
which have the signal number and errno mapped until an execve().
This is similar to the maintaining a table of signal handlers to
map the signal numbers done earlier. This mapping is extended to
the process after an execve() by passing the final set of mapped
file descriptors via a pair of environment variables.

Disabling signal and file descriptor read mapping in parent
if the child would break the mapping algorithms.

This code passes at least all of the non-POSIX LTP tests,
including an updated LTP signalfd4 test that posts SIGNALS
and uses this read() mechanism to get signal info.

inotify_init1 is similar to signalfd(), timerfd() and other
filefd functions which map read() calls. Unlike signalfd(), and
similar to timerfd(), the reads don't appear to need to be mapped.

The members of the inotify_event structure appear to be generic.
The mask bits like IN_MOVE_FROM and IN_MOVE_TO are defined in
generic files. The LTP test in testcases/kernel/syscalls/inotify
test for the inotify_event structure being inotify_event structure
being read and does seem to check it contents being correct.

Change-Id: I3f2dcd4e33437ac953cd9f67f56dccc6ec6e5e6f
Signed-off-by: Pete Delaney <piet.delaney@imgtec.com>
Signed-off-by: Chris Dearman <chris.dearman@imgtec.com>
Signed-off-by: Paul Lind <paul.lind@imgtec.com>
2013-02-20 20:05:19 -08:00

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/*
* Copyright 2012, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <unistd.h>
#include <stdarg.h>
#include <signal.h>
#include <signal_portable.h>
#include <time.h>
#include <errno.h>
#include <errno_portable.h>
#include <eventfd_portable.h>
#include <filefd_portable.h>
#include <inotify_portable.h>
#include <timerfd_portable.h>
#include <asm/unistd-portable.h>
#include <asm/unistd.h>
#define PORTABLE_TAG "syscall_portable"
#include <log_portable.h>
#if __NR_gettimeofday_portable == __NR_gettimeofday
#error "Bad build environment"
#endif
/*
* Minimal syscall support for LTP testing.
* These are the system calls that LTP references explicitly.
* Not all of them are exported via bionic header so use #ifdef.
*
* TODO:
* Add existing portable system calls currently redirected from
* experimental Bionic linker code so that calls to them via
* syscall() are also processed. For example, LTP only calls open()
* directly and never does a syscall(__NR_open, ...).
*/
extern int syscall(int, ...);
#define MAXARGS 8
int syscall_portable(int portable_number, ...)
{
va_list ap;
int native_number, ret;
int i, nargs, args[MAXARGS];
ALOGV(" ");
ALOGV("%s(portable_number:%d, ...) {", __func__, portable_number);
switch (portable_number) {
#ifdef __NR_add_key_portable
case __NR_add_key_portable: native_number = __NR_add_key; break;
#endif
#ifdef __NR_cacheflush_portable
case __NR_cacheflush_portable: {
long start, end, flags;
va_start(ap, portable_number);
start = va_arg(ap, long);
end = va_arg(ap, long);
flags = va_arg(ap, long);
va_end(ap);
ret = cacheflush(start, end, flags);
goto done;
}
#endif
#ifdef __NR_capget_portable
case __NR_capget_portable: native_number = __NR_capget; break;
#endif
#ifdef __NR_capset_portable
case __NR_capset_portable: native_number = __NR_capset; break;
#endif
#ifdef __NR_clock_getres_portable
case __NR_clock_getres_portable: native_number = __NR_clock_getres; break;
#endif
#ifdef __NR_clock_nanosleep
case __NR_clock_nanosleep_portable: native_number = __NR_clock_nanosleep; break;
#endif
#ifdef __NR_dup3_portable
case __NR_dup3_portable: native_number = __NR_dup3; break;
#endif
#ifdef __NR_epoll_create_portable
case __NR_epoll_create_portable: native_number = __NR_epoll_create; break;
#endif
#ifdef __NR_epoll_create1_portable
case __NR_epoll_create1_portable: native_number = __NR_epoll_create1; break;
#endif
#ifdef __NR_eventfd_portable
/*
* Prior to 2.6.27 we only had this system call,
* which didn't have a flags argument. The kernel
* just provides a zero for flags when this system
* call number is used.
*/
case __NR_eventfd_portable: {
unsigned int initval; /* 64-bit counter initial value */
int flags = 0;
va_start(ap, portable_number);
initval = va_arg(ap, int);
va_end(ap);
ret = eventfd_portable(initval, flags); /* Android uses __NR_eventfd2 in eventfd() */
goto done;
}
#endif
#ifdef __NR_eventfd2_portable
/*
* Starting with Linux 2.6.27 a flags argument was added.
* Both Bionic and glibc implement the eventfd() now with
* the additional flags argument.
*/
case __NR_eventfd2_portable: {
unsigned int initval; /* 64-bit counter initial value */
int flags;
va_start(ap, portable_number);
initval = va_arg(ap, int);
flags = va_arg(ap, int);
va_end(ap);
ret = eventfd_portable(initval, flags); /* Android uses __NR_eventfd2 in eventfd() */
goto done;
}
#endif
#ifdef __NR_exit_group_portable
case __NR_exit_group_portable: native_number = __NR_exit_group; break;
#endif
#ifdef __NR_faccessat_portable
case __NR_faccessat_portable: native_number = __NR_faccessat; break;
#endif
#ifdef __NR_fallocate_portable
case __NR_fallocate_portable: native_number = __NR_fallocate; break;
#endif
#ifdef __NR_fchmodat_portable
case __NR_fchmodat_portable: native_number = __NR_fchmodat; break;
#endif
#ifdef __NR_fchownat_portable
case __NR_fchownat_portable: native_number = __NR_fchownat; break;
#endif
#ifdef __NR_fstatat64_portable
case __NR_fstatat64_portable: native_number = __NR_fstatat64; break;
#endif
#ifdef __NR_futimesat_portable
case __NR_futimesat_portable: native_number = __NR_futimesat; break;
#endif
#ifdef __NR_getegid_portable
case __NR_getegid_portable: native_number = __NR_getegid; break;
#endif
#ifdef __NR_geteuid_portable
case __NR_geteuid_portable: native_number = __NR_geteuid; break;
#endif
#ifdef __NR_getgid_portable
case __NR_getgid_portable: native_number = __NR_getgid; break;
#endif
#ifdef __NR_get_mempolicy_portable
case __NR_get_mempolicy_portable: native_number = __NR_get_mempolicy; break;
#endif
#ifdef __NR_get_robust_list_portable
case __NR_get_robust_list_portable: native_number = __NR_get_robust_list; break;
#endif
#ifdef __NR_gettid_portable
case __NR_gettid_portable: native_number = __NR_gettid; break;
#endif
#ifdef __NR_gettimeofday_portable
case __NR_gettimeofday_portable: native_number = __NR_gettimeofday; break;
#endif
#ifdef __NR_getuid_portable
case __NR_getuid_portable: native_number = __NR_getuid; break;
#endif
#ifdef __NR_inotify_init_portable
case __NR_inotify_init_portable: native_number = __NR_inotify_init; break;
#endif
#ifdef __NR_inotify_add_watch_portable
case __NR_inotify_add_watch_portable: native_number = __NR_inotify_add_watch; break;
#endif
#ifdef __NR_inotify_init1_portable
case __NR_inotify_init1_portable: {
int portable_flags;
va_start(ap, portable_number);
portable_flags = va_arg(ap, int);
va_end(ap);
ret = inotify_init1_portable(portable_flags);
goto done;
}
#endif
#ifdef __NR_keyctl_portable
case __NR_keyctl_portable: native_number = __NR_keyctl; break;
#endif
#ifdef __NR_linkat
case __NR_linkat_portable: native_number = __NR_linkat; break;
#endif
#ifdef __NR_mbind_portable
case __NR_mbind_portable: native_number = __NR_mbind; break;
#endif
#ifdef __NR_mkdirat_portable
case __NR_mkdirat_portable: native_number = __NR_mkdirat; break;
#endif
#ifdef __NR_mknodat_portable
case __NR_mknodat_portable: native_number = __NR_mknodat; break;
#endif
#ifdef __NR_openat_portable
case __NR_openat_portable: native_number = __NR_openat; break;
#endif
#ifdef __NR_pipe2_portable
case __NR_pipe2_portable: {
int *pipefd_ptr;
int portable_flags;
va_start(ap, portable_number);
pipefd_ptr = va_arg(ap, int *);
portable_flags = va_arg(ap, int);
va_end(ap);
ret = pipe2_portable(pipefd_ptr, portable_flags);
goto done;
}
#endif
#ifdef __NR_readahead_portable
case __NR_readahead_portable: native_number = __NR_readahead; break;
#endif
#ifdef __NR_readlinkat_portable
case __NR_readlinkat_portable: native_number = __NR_readlinkat; break;
#endif
#ifdef __NR_renameat_portable
case __NR_renameat_portable: native_number = __NR_renameat; break;
#endif
#ifdef __NR_rt_sigaction_portable
case __NR_rt_sigaction_portable: {
int sig;
struct sigaction_portable *act;
struct sigaction_portable *oact;
size_t sigsetsize;
va_start(ap, portable_number);
sig = va_arg(ap, int);
act = va_arg(ap, struct sigaction_portable *);
oact = va_arg(ap, struct sigaction_portable *);
sigsetsize = va_arg(ap, size_t);
va_end(ap);
return __rt_sigaction_portable(sig, act, oact, sigsetsize);
}
#endif
#ifdef __NR_rt_sigprocmask_portable
case __NR_rt_sigprocmask_portable: {
int how;
const sigset_portable_t *set;
sigset_portable_t *oset;
size_t sigsetsize;
va_start(ap, portable_number);
how = va_arg(ap, int);
set = va_arg(ap, sigset_portable_t *);
oset = va_arg(ap, sigset_portable_t *);
sigsetsize = va_arg(ap, size_t);
va_end(ap);
ret = __rt_sigprocmask_portable(how, set, oset, sigsetsize);
goto done;
}
#endif
#ifdef __NR_rt_sigtimedwait_portable
case __NR_rt_sigtimedwait_portable: {
const sigset_portable_t *set;
siginfo_portable_t *info;
const struct timespec *timeout;
size_t sigsetsize;
va_start(ap, portable_number);
set = va_arg(ap, sigset_portable_t *);
info = va_arg(ap, siginfo_portable_t *);
timeout = va_arg(ap, struct timespec *);
sigsetsize = va_arg(ap, size_t);
va_end(ap);
ret = __rt_sigtimedwait_portable(set, info, timeout, sigsetsize);
goto done;
}
#endif
#ifdef __NR_rt_sigqueueinfo_portable
case __NR_rt_sigqueueinfo_portable: {
pid_t pid;
int sig;
siginfo_portable_t *uinfo;
va_start(ap, portable_number);
pid = va_arg(ap, pid_t);
sig = va_arg(ap, int);
uinfo = va_arg(ap, siginfo_portable_t *);
va_end(ap);
ret = rt_sigqueueinfo_portable(pid, sig, uinfo);
goto done;
}
#endif
#ifdef __NR_setgid_portable
case __NR_setgid_portable: native_number = __NR_setgid; break;
#endif
#ifdef __NR_set_mempolicy_portable
case __NR_set_mempolicy_portable: native_number = __NR_set_mempolicy; break;
#endif
#ifdef __NR_set_robust_list_portable
case __NR_set_robust_list_portable: native_number = __NR_set_robust_list; break;
#endif
#ifdef __NR_set_tid_address_portable
case __NR_set_tid_address_portable: native_number = __NR_set_tid_address; break;
#endif
#ifdef __NR_sgetmask_portable
case __NR_sgetmask_portable: native_number = __NR_sgetmask; break;
#endif
#ifdef __NR_signalfd4_portable
case __NR_signalfd4_portable: {
int fd;
sigset_portable_t *portable_sigmask;
int sigsetsize;
int flags;
va_start(ap, portable_number);
fd = va_arg(ap, int);
portable_sigmask = va_arg(ap, sigset_portable_t *);
sigsetsize = va_arg(ap, int);
flags = va_arg(ap, int);
va_end(ap);
ret = do_signalfd4_portable(fd, (const sigset_portable_t *) portable_sigmask, sigsetsize,
flags);
goto done;
}
#endif
#ifdef __NR_socketcall_portable
case __NR_socketcall_portable: native_number = __NR_socketcall; break;
#endif
#ifdef __NR_splice_portable
case __NR_splice_portable: native_number = __NR_splice; break;
#endif
/* REMIND - DOUBLE CHECK THIS ONE */
#ifdef __NR_ssetmask_portable
case __NR_ssetmask_portable: native_number = __NR_ssetmask; break;
#endif
#ifdef __NR_swapoff_portable
case __NR_swapoff_portable: native_number = __NR_swapoff; break;
#endif
#ifdef __NR_swapon_portable
case __NR_swapon_portable: native_number = __NR_swapon; break;
#endif
#ifdef __NR_symlinkat_portable
case __NR_symlinkat_portable: native_number = __NR_symlinkat; break;
#endif
/*
* ARM uses the new, version 2, form of sync_file_range() which
* doesn't waste 32 bits between the 32 bit arg and the 64 bit arg.
* It does this by moving the last 32 bit arg and placing it with
* the 1st 32 bit arg.
*
* Here's the trivial mapping function in the kernel ARM code:
*
* sync_file_range2(int fd, unsigned int flags, loff_t offset, loff_t nbytes) {
* return sys_sync_file_range(fd, offset, nbytes, flags);
* }
*
* For portability we have to do a similar mapping for the native/MIPS system
* call but have to provide the alignment padding expected by the sync_file_range()
* system call. We avoid alignment issues while using varargs by avoiding the use
* of 64 bit args.
*/
#if defined( __NR_arm_sync_file_range_portable)
case __NR_arm_sync_file_range_portable: native_number = __NR_sync_file_range; {
int fd;
int flags;
int offset_low, offset_high;
int nbytes_low, nbytes_high;
int align_fill = 0;
va_start(ap, portable_number);
fd = va_arg(ap, int);
flags = va_arg(ap, int);
offset_low = va_arg(ap, int);
offset_high = va_arg(ap, int);
nbytes_low = va_arg(ap, int);
nbytes_high = va_arg(ap, int);
va_end(ap);
ALOGV("%s: Calling syscall(native_number:%d:'sync_file_range', fd:%d, "
"align_fill:0x%x, offset_low:0x%x, offset_high:0x%x, "
"nbytes_low:0x%x, nbytes_high:0x%x, flags:0x%x);", __func__,
native_number, fd, align_fill, offset_low, offset_high,
nbytes_low, nbytes_high, flags);
ret = syscall(native_number, fd, align_fill, offset_low, offset_high,
nbytes_low, nbytes_high, flags);
goto done;
}
#endif
#ifdef __NR__sysctl_portable
case __NR__sysctl_portable: native_number = __NR__sysctl; break;
#endif
#ifdef __NR_sysfs_portable
case __NR_sysfs_portable: native_number = __NR_sysfs; break;
#endif
#ifdef __NR_syslog_portable
case __NR_syslog_portable: native_number = __NR_syslog; break;
#endif
#ifdef __NR_tee_portable
case __NR_tee_portable: native_number = __NR_tee; break;
#endif
#ifdef __NR_timer_create_portable
case __NR_timer_create_portable: {
clockid_t clockid;
struct sigevent *evp;
timer_t *timerid;
va_start(ap, portable_number);
clockid = va_arg(ap, clockid_t);
evp = va_arg(ap, struct sigevent *);
timerid = va_arg(ap, timer_t *);
va_end(ap);
ret = timer_create_portable(clockid, evp, timerid);
goto done;
}
#endif
#ifdef __NR_timerfd_create_portable
case __NR_timerfd_create_portable: {
int clockid;
int flags;
va_start(ap, portable_number);
clockid = va_arg(ap, int); /* clockid is portable */
flags = va_arg(ap, int); /* flags need to be mapped */
va_end(ap);
ret = timerfd_create_portable(clockid, flags);
goto done;
}
#endif
#ifdef __NR_timerfd_gettime_portable
case __NR_timerfd_gettime_portable: native_number = __NR_timerfd_gettime; break;
#endif
#ifdef __NR_timerfd_settime_portable
case __NR_timerfd_settime_portable: native_number = __NR_timerfd_settime; break;
#endif
#ifdef __NR_timer_getoverrun_portable
case __NR_timer_getoverrun_portable: native_number = __NR_timer_getoverrun; break;
#endif
#ifdef __NR_timer_gettime_portable
case __NR_timer_gettime_portable: native_number = __NR_timer_gettime; break;
#endif
#ifdef __NR_timer_settime_portable
case __NR_timer_settime_portable: native_number = __NR_timer_settime; break;
#endif
#ifdef __NR_rt_tgsigqueueinfo_portable
case __NR_rt_tgsigqueueinfo_portable: {
pid_t tgid;
pid_t pid;
int sig;
siginfo_portable_t *uinfo;
va_start(ap, portable_number);
tgid = va_arg(ap, pid_t);
pid = va_arg(ap, pid_t);
sig = va_arg(ap, int);
uinfo = va_arg(ap, siginfo_portable_t *);
va_end(ap);
ret = rt_tgsigqueueinfo_portable(tgid, pid, sig, uinfo);
goto done;
}
#endif
#ifdef __NR_tkill_portable
case __NR_tkill_portable: {
int tid, sig;
va_start(ap, portable_number);
tid = va_arg(ap, int);
sig = va_arg(ap, int);
va_end(ap);
ret = tkill_portable(tid, sig);
goto done;
}
#endif
#ifdef __NR_uname_portable
case __NR_uname_portable: native_number = __NR_uname; break;
#endif
#ifdef __NR_vmsplice_portable
case __NR_vmsplice_portable: native_number = __NR_vmsplice; break;
#endif
default:
ALOGV("%s(portable_number:%d, ...): case default; native_number = -1; "
"[ERROR: ADD MISSING SYSTEM CALL]", __func__, portable_number);
native_number = -1;
break;
}
ALOGV("%s: native_number = %d", __func__, native_number);
if (native_number <= 0) {
ALOGV("%s: native_number:%d <= 0; ret = -1; [ERROR: FIX SYSTEM CALL]", __func__,
native_number);
errno = ENOSYS;
ret = -1;
goto done;
}
/*
* Get the argument list
* This is pretty crappy:
* It assumes that the portable and native arguments are compatible
* It assumes that no more than MAXARGS arguments are passed
*
* Possible changes:
* o include the argument count for each mapped system call
* o map the syscall into the equivalent library call:
* eg syscall(__NR_gettimeofday_portable, struct timeval *tv, struct timezone *tz) =>
* gettimeofday(struct timeval *tv, struct timezone *tz)
*
* second option is probably best as it allows argument remapping to take place if needed
*
*/
va_start(ap, portable_number);
/* For now assume all syscalls take MAXARGS arguments. */
nargs = MAXARGS;
for (i = 0; i < nargs; i++)
args[i] = va_arg(ap, int);
va_end(ap);
ALOGV("%s: Calling syscall(%d, %d, %d, %d, %d, %d, %d, %d, %d);", __func__,
native_number, args[0], args[1], args[2], args[3], args[4],
args[5], args[6], args[7]);
ret = syscall(native_number, args[0], args[1], args[2], args[3],
args[4], args[5], args[6], args[7]);
done:
if (ret == -1) {
ALOGV("%s: ret == -1; errno:%d;", __func__, errno);
}
ALOGV("%s: return(ret:%d); }", __func__, ret);
return ret;
}
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