From 2dc8cd24da4d22e625a4815a5fb2787139eaafed Mon Sep 17 00:00:00 2001
From: Szabolcs Nagy <nsz@port70.net>
Date: Wed, 15 Jan 2014 02:50:47 +0100
Subject: [PATCH] add wrapasm: i386 tracer using tail call from asm

---
 Makefile    |   11 +-
 funcnames   | 1701 +++++++++++++++++++++++++++++++++++++++++++++++++++
 genasm.sh   |   22 +
 wrap_help.c |   18 +
 4 files changed, 1749 insertions(+), 3 deletions(-)
 create mode 100644 funcnames
 create mode 100755 genasm.sh
 create mode 100644 wrap_help.c

diff --git a/Makefile b/Makefile
index a78a1ff..0e1313b 100644
--- a/Makefile
+++ b/Makefile
@@ -2,14 +2,19 @@ CFLAGS=-std=c99 -Os -g
 #CFLAGS+=-fomit-frame-pointer -fno-unwind-tables -fno-asynchronous-unwind-tables
 LDFLAGS=-g
 CC=musl-gcc
-all: wrap.so hello stress
+all: wrap.so hello stress wrapasm.so
 hello: hello.o
 stress: stress.o
 wrap.o: head.h func.h
 wrap.so: wrap.o
-	$(CC) $(LDFLAGS) -shared -o $@ $< -ldl -lm -lrt -lcrypt
+	$(CC) $(LDFLAGS) -shared -o $@ $< -ldl -lm -lrt -lpthread -lutil -lcrypt
+func.s: funcnames
+	./genasm.sh <$< >$@
+func.o: func.s
+wrapasm.so: func.o wrap_help.o
+	$(CC) $(LDFLAGS) -shared -o $@ $^ -ldl -lm -lrt -lpthread -lutil -lcrypt
 clean:
-	rm -f wrap.so hello stress *.o
+	rm -f wrap.so hello stress *.o wrapasm.so
 test: all
 	LD_PRELOAD=./wrap.so ./hello
 	LD_PRELOAD=./wrap.so ./stress 2>&1 |wc -l
diff --git a/funcnames b/funcnames
new file mode 100644
index 0000000..02b42d7
--- /dev/null
+++ b/funcnames
@@ -0,0 +1,1701 @@
+_Exit
+_IO_getc
+_IO_getc_unlocked
+_IO_putc
+_IO_putc_unlocked
+_IO_feof_unlocked
+_IO_ferror_unlocked
+__acquire_ptc
+__aio_wake
+__asctime
+__assert_fail
+__block_all_sigs
+__block_app_sigs
+__brk
+__cachectl
+__cancel
+__clock_gettime
+__clone
+__copy_tls
+__cos
+__cosdf
+__cosl
+__crypt_blowfish
+__crypt_des
+__crypt_md5
+__crypt_r
+__crypt_sha256
+__crypt_sha512
+__ctype_b_loc
+__ctype_get_mb_cur_max
+__ctype_tolower_loc
+__ctype_toupper_loc
+__cxa_atexit
+__cxa_finalize
+__dladdr
+__dlinfo
+__dlsym
+__dn_comp
+__dn_expand
+__dns_count_addrs
+__dns_doqueries
+__dns_get_rr
+__dns_query
+__do_cleanup_pop
+__do_cleanup_push
+__dup3
+__duplocale
+__dynlink
+__errno_location
+__execvpe
+__expo2
+__expo2f
+__fbufsize
+__fclose_ca
+__fdopen
+__fesetround
+__fgetwc_unlocked
+__flbf
+__floatscan
+__flush_on_exit
+__fmodeflags
+__fopen_rb_ca
+__fork_handler
+__fpclassify
+__fpclassifyf
+__fpclassifyl
+__fpending
+__fpurge
+__fputwc_unlocked
+__freadable
+__freadahead
+__freading
+__freadptr
+__freadptrinc
+__freelocale
+__fseeko
+__fseeko_unlocked
+__fseterr
+__fsetlocking
+__fstatfs
+__ftello
+__ftello_unlocked
+__funcs_on_exit
+__funcs_on_quick_exit
+__futex
+__fwritable
+__fwritex
+__fwriting
+__fxstat
+__fxstat64
+__fxstatat
+__fxstatat64
+__get_handler_set
+__getdelim
+__getdents
+__getgrent_a
+__getpwent_a
+__gmtime_r
+__h_errno_location
+__inhibit_ptc
+__init_libc
+__init_security
+__init_ssp
+__init_tls
+__install_initial_tls
+__intscan
+__invtrigl_R
+__ipparse
+__isoc99_fscanf
+__isoc99_fwscanf
+__isoc99_scanf
+__isoc99_sscanf
+__isoc99_swscanf
+__isoc99_vfscanf
+__isoc99_vfwscanf
+__isoc99_vscanf
+__isoc99_vsscanf
+__isoc99_vswscanf
+__isoc99_vwscanf
+__isoc99_wscanf
+__iswctype_l
+__ldexp_cexp
+__ldexp_cexpf
+__lgamma_r
+__lgammaf_r
+__lgammal_r
+__libc_current_sigrtmax
+__libc_current_sigrtmin
+__libc_get_version
+__libc_loc
+__libc_sigaction
+__libc_start_main
+__localtime_r
+__lock
+__lockfile
+__longjmp
+__lxstat
+__lxstat64
+__madvise
+__map_file
+__memalign
+__memrchr
+__mkostemps
+__mmap
+__month_to_secs
+__mremap
+__munmap
+__newlocale
+__nl_langinfo
+__nl_langinfo_l
+__overflow
+__p1evll
+__parsespent
+__polevll
+__posix_getopt
+__posix_spawnx
+__procfdname
+__pthread_self_def
+__pthread_self_init
+__pthread_tsd_run_dtors
+__ptsname_r
+__putenv
+__rand48_step
+__randname
+__release_ptc
+__rem_pio2
+__rem_pio2_large
+__rem_pio2f
+__rem_pio2l
+__res_state
+__reset_tls
+__restore
+__restore_rt
+__restore_sigs
+__sched_cpucount
+__secs_to_tm
+__secs_to_zone
+__seek_on_exit
+__set_thread_area
+__setjmp
+__setrlimit
+__setxid
+__shgetc
+__shlim
+__shm_mapname
+__sigaction
+__signbit
+__signbitf
+__signbitl
+__simple_malloc
+__sin
+__sindf
+__sinl
+__stack_chk_fail
+__statfs
+__stdio_close
+__stdio_exit
+__stdio_read
+__stdio_seek
+__stdio_write
+__stdout_write
+__stpcpy
+__stpncpy
+__strchrnul
+__strcoll_l
+__strdup
+__strftime_fmt_1
+__strftime_l
+__string_read
+__strtod_l
+__strtof_l
+__strtoimax_internal
+__strtol_internal
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+__strtoll_internal
+__strtoul_internal
+__strtoull_internal
+__strtoumax_internal
+__strxfrm_l
+__synccall
+__syscall
+__syscall_cp
+__syscall_cp_asm
+__syscall_ret
+__tan
+__tandf
+__tanl
+__testcancel
+__timedwait
+__tls_get_addr
+__tm_to_secs
+__tm_to_tzname
+__toread
+__towlower_l
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+__unlock
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+__unmapself
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+__vdso_clock_gettime
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+__vm_lock
+__vm_lock_impl
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+__vm_unlock_impl
+__vsyslog
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+__wcscoll_l
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+__wctype_l
+__xpg_basename
+__xpg_strerror_r
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+__xstat64
+__year_to_secs
+__yield
+_dl_debug_state
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+_flush_cache
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+pthread_attr_init
+pthread_attr_setdetachstate
+pthread_attr_setguardsize
+pthread_attr_setinheritsched
+pthread_attr_setschedparam
+pthread_attr_setschedpolicy
+pthread_attr_setscope
+pthread_attr_setstack
+pthread_attr_setstacksize
+pthread_barrier_destroy
+pthread_barrier_init
+pthread_barrier_wait
+pthread_barrierattr_destroy
+pthread_barrierattr_getpshared
+pthread_barrierattr_init
+pthread_barrierattr_setpshared
+pthread_cancel
+pthread_cond_broadcast
+pthread_cond_destroy
+pthread_cond_init
+pthread_cond_signal
+pthread_cond_timedwait
+pthread_cond_wait
+pthread_condattr_destroy
+pthread_condattr_getclock
+pthread_condattr_getpshared
+pthread_condattr_init
+pthread_condattr_setclock
+pthread_condattr_setpshared
+pthread_create
+pthread_detach
+pthread_equal
+pthread_exit
+pthread_getaffinity_np
+pthread_getattr_np
+pthread_getconcurrency
+pthread_getcpuclockid
+pthread_getschedparam
+pthread_getspecific
+pthread_join
+pthread_key_create
+pthread_key_delete
+pthread_kill
+pthread_mutex_consistent
+pthread_mutex_destroy
+pthread_mutex_getprioceiling
+pthread_mutex_init
+pthread_mutex_lock
+pthread_mutex_setprioceiling
+pthread_mutex_timedlock
+pthread_mutex_trylock
+pthread_mutex_unlock
+pthread_mutexattr_destroy
+pthread_mutexattr_getprotocol
+pthread_mutexattr_getpshared
+pthread_mutexattr_getrobust
+pthread_mutexattr_gettype
+pthread_mutexattr_init
+pthread_mutexattr_setprotocol
+pthread_mutexattr_setpshared
+pthread_mutexattr_setrobust
+pthread_mutexattr_settype
+pthread_once
+pthread_rwlock_destroy
+pthread_rwlock_init
+pthread_rwlock_rdlock
+pthread_rwlock_timedrdlock
+pthread_rwlock_timedwrlock
+pthread_rwlock_tryrdlock
+pthread_rwlock_trywrlock
+pthread_rwlock_unlock
+pthread_rwlock_wrlock
+pthread_rwlockattr_destroy
+pthread_rwlockattr_getpshared
+pthread_rwlockattr_init
+pthread_rwlockattr_setpshared
+pthread_self
+pthread_setaffinity_np
+pthread_setcancelstate
+pthread_setcanceltype
+pthread_setconcurrency
+pthread_setschedparam
+pthread_setschedprio
+pthread_setspecific
+pthread_sigmask
+pthread_spin_destroy
+pthread_spin_init
+pthread_spin_lock
+pthread_spin_trylock
+pthread_spin_unlock
+pthread_testcancel
+ptrace
+ptsname
+ptsname_r
+putc
+putc_unlocked
+putchar
+putchar_unlocked
+putenv
+putgrent
+putpwent
+puts
+putspent
+pututline
+pututxline
+putw
+putwc
+putwc_unlocked
+putwchar
+putwchar_unlocked
+pwrite
+pwrite64
+pwritev
+pwritev64
+qsort
+quick_exit
+quotactl
+raise
+rand
+rand_r
+random
+read
+readahead
+readdir
+readdir64
+readdir_r
+readdir64_r
+readlink
+readlinkat
+readv
+realloc
+realpath
+reboot
+recv
+recvfrom
+recvmsg
+regcomp
+regerror
+regexec
+regfree
+remainder
+remainderf
+remainderl
+remap_file_pages
+remove
+removexattr
+remque
+remquo
+remquof
+remquol
+rename
+renameat
+res_init
+res_query
+res_search
+rewind
+rewinddir
+rindex
+rint
+rintf
+rintl
+rmdir
+round
+roundf
+roundl
+sbrk
+scalb
+scalbf
+scalbln
+scalblnf
+scalblnl
+scalbn
+scalbnf
+scalbnl
+scandir
+scandir64
+scanf
+sched_get_priority_max
+sched_get_priority_min
+sched_getaffinity
+sched_getparam
+sched_getscheduler
+sched_rr_get_interval
+sched_setaffinity
+sched_setparam
+sched_setscheduler
+sched_yield
+seed48
+seekdir
+select
+sem_close
+sem_destroy
+sem_getvalue
+sem_init
+sem_open
+sem_post
+sem_timedwait
+sem_trywait
+sem_unlink
+sem_wait
+semctl
+semget
+semop
+semtimedop
+send
+sendfile
+sendfile64
+sendmsg
+sendto
+setbuf
+setbuffer
+setdomainname
+setegid
+setenv
+seteuid
+setfsgid
+setfsuid
+setgid
+setgrent
+setgroups
+sethostent
+sethostname
+setitimer
+setjmp
+setlinebuf
+setlocale
+setlogmask
+setmntent
+setnetent
+setns
+setpgid
+setpgrp
+setpriority
+setprotoent
+setpwent
+setregid
+setresgid
+setresuid
+setreuid
+setrlimit
+setrlimit64
+setservent
+setsid
+setsockopt
+setspent
+setstate
+settimeofday
+setuid
+setusershell
+setutent
+setutxent
+setvbuf
+setxattr
+shm_open
+shm_unlink
+shmat
+shmctl
+shmdt
+shmget
+shutdown
+sigaction
+sigaddset
+sigaltstack
+sigandset
+sigdelset
+sigemptyset
+sigfillset
+sighold
+sigignore
+siginterrupt
+sigisemptyset
+sigismember
+siglongjmp
+signal
+signalfd
+significand
+significandf
+sigorset
+sigpause
+sigpending
+sigprocmask
+sigqueue
+sigrelse
+sigset
+sigsetjmp
+sigsuspend
+sigtimedwait
+sigwait
+sigwaitinfo
+sin
+sincos
+sincosf
+sincosl
+sinf
+sinh
+sinhf
+sinhl
+sinl
+sleep
+snprintf
+sockatmark
+socket
+socketpair
+splice
+sprintf
+sqrt
+sqrtf
+sqrtl
+srand
+srand48
+srandom
+sscanf
+stat
+stat64
+statfs
+statfs64
+statvfs
+statvfs64
+stime
+stpcpy
+stpncpy
+strcasecmp
+strcasecmp_l
+strcasestr
+strcat
+strchr
+strchrnul
+strcmp
+strcoll
+strcoll_l
+strcpy
+strcspn
+strdup
+strerror
+strerror_l
+strerror_r
+strfmon
+strfmon_l
+strftime
+strftime_l
+strlcat
+strlcpy
+strlen
+strncasecmp
+strncasecmp_l
+strncat
+strncmp
+strncpy
+strndup
+strnlen
+strpbrk
+strptime
+strrchr
+strsep
+strsignal
+strspn
+strstr
+strtod
+strtod_l
+strtof
+strtof_l
+strtoimax
+strtok
+strtok_r
+strtol
+strtold
+strtold_l
+strtoll
+strtoul
+strtoull
+strtoumax
+strverscmp
+strxfrm
+strxfrm_l
+swab
+swapoff
+swapon
+swprintf
+swscanf
+symlink
+symlinkat
+sync
+sync_file_range
+syncfs
+syscall
+sysconf
+sysinfo
+syslog
+system
+tan
+tanf
+tanh
+tanhf
+tanhl
+tanl
+tcdrain
+tcflow
+tcflush
+tcgetattr
+tcgetpgrp
+tcgetsid
+tcsendbreak
+tcsetattr
+tcsetpgrp
+tdelete
+tdestroy
+tee
+telldir
+tempnam
+textdomain
+tfind
+tgamma
+tgammaf
+tgammal
+time
+timegm
+timer_create
+timer_delete
+timer_getoverrun
+timer_gettime
+timer_settime
+timerfd_create
+timerfd_gettime
+timerfd_settime
+times
+tmpfile
+tmpfile64
+tmpnam
+toascii
+tolower
+tolower_l
+toupper
+toupper_l
+towctrans
+towctrans_l
+towlower
+towlower_l
+towupper
+towupper_l
+__tre_mem_alloc_impl
+__tre_mem_destroy
+__tre_mem_new_impl
+trunc
+truncate
+truncate64
+truncf
+truncl
+tsearch
+ttyname
+ttyname_r
+twalk
+tzset
+ualarm
+ulckpwdf
+ulimit
+umask
+umount
+umount2
+uname
+ungetc
+ungetwc
+unlink
+unlinkat
+unlockpt
+unsetenv
+unshare
+updwtmp
+updwtmpx
+uselocale
+usleep
+utime
+utimensat
+utimes
+valloc
+vasprintf
+vdprintf
+verr
+verrx
+versionsort
+vfork
+vfprintf
+vfscanf
+vfwprintf
+vfwscanf
+vhangup
+vmsplice
+vprintf
+vscanf
+vsnprintf
+vsprintf
+vsscanf
+vswprintf
+vswscanf
+vsyslog
+vwarn
+vwarnx
+vwprintf
+vwscanf
+wait
+wait3
+wait4
+waitid
+waitpid
+warn
+warnx
+wcpcpy
+wcpncpy
+wcrtomb
+wcscasecmp
+wcscasecmp_l
+wcscat
+wcschr
+wcscmp
+wcscoll
+wcscoll_l
+wcscpy
+wcscspn
+wcsdup
+wcsftime
+wcsftime_l
+wcslen
+wcsncasecmp
+wcsncasecmp_l
+wcsncat
+wcsncmp
+wcsncpy
+wcsnlen
+wcsnrtombs
+wcspbrk
+wcsrchr
+wcsrtombs
+wcsspn
+wcsstr
+wcstod
+wcstof
+wcstoimax
+wcstok
+wcstol
+wcstold
+wcstoll
+wcstombs
+wcstoul
+wcstoull
+wcstoumax
+wcswcs
+wcswidth
+wcsxfrm
+wcsxfrm_l
+wctob
+wctomb
+wctrans
+wctrans_l
+wctype
+wctype_l
+wcwidth
+wmemchr
+wmemcmp
+wmemcpy
+wmemmove
+wmemset
+wordexp
+wordfree
+wprintf
+write
+writev
+wscanf
+y0
+y0f
+y1
+y1f
+yn
+ynf
diff --git a/genasm.sh b/genasm.sh
new file mode 100755
index 0000000..95112e1
--- /dev/null
+++ b/genasm.sh
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+awk '
+/dlsym/ {next}
+/__syscall/ {next}
+{
+	a[++n] = $1
+	print ".global " $1
+	print ".type " $1 ",@function"
+	print $1 ":"
+	print "	pushl $sym_" $1
+	print "	call wrap_help"
+	print "	pop %ecx"
+	print "	jmp *%eax"
+}
+END{
+	print ".section .rodata"
+	for (i=1;i<=n;i++) {
+		print "sym_" a[i] ":"
+		print "	.string \"" a[i] "\""
+	}
+}'
diff --git a/wrap_help.c b/wrap_help.c
new file mode 100644
index 0000000..e2a80fd
--- /dev/null
+++ b/wrap_help.c
@@ -0,0 +1,18 @@
+#define _GNU_SOURCE
+#include <dlfcn.h>
+#include <sys/uio.h>
+#include <sys/syscall.h>
+
+long __syscall(long,...);
+
+static char *end(char *s) {while(*s) s++; return s;}
+
+void *wrap_help(char *s)
+{
+	struct iovec iov[2] = {
+		{ .iov_base = s, .iov_len = end(s)-s },
+		{ .iov_base = "\n", .iov_len = 1 }
+	};
+	__syscall(SYS_writev, 2, iov, 2);
+	return dlsym(RTLD_NEXT, s);
+}
-- 
2.20.1