http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52221
Bug #: 52221
Summary: [libffi] r184021 needs to be fixed.
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libffi
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: jojel...@gmail.com
Host: i686-pc-cygwin
Target: i686-pc-mingw32
Build: i686-pc-cygwin
tried libjava with r184135, but got SIGSEGV because of following.
in libffi/src/x86/ffi.c,
#define FFI_INIT_TRAMPOLINE_THISCALL(TRAMP,FUN,CTX,SIZE) \
{ unsigned char *__tramp = (unsigned char*)(TRAMP); \
unsigned int __fun = (unsigned int)(FUN); \
unsigned int __ctx = (unsigned int)(CTX); \
unsigned int __dis = __fun - (__ctx + 22); \
^^^^
49
and fixing above didn't succeed ExtraClassLoader testcase
Starting program: /tmp/gcc/i686-pc-mingw32/libjava/testsuite/ExtraClassLoader
[New Thread 412.0xa24]
[New Thread 412.0x1398]
Program received signal SIGSEGV, Segmentation fault.
0x696c8140 in java::lang::Class* java::lang::Object::getClass() ()
from /cygdrive/d/cygwin/tmp/gcc/i686-pc-mingw32/libjava/.libs/libgcj-13.dll
(gdb) i r
eax 0xe 0xe
ecx 0x8df4458b 0x8df4458b
edx 0x22f9c4 0x22f9c4
ebx 0x1 0x1
esp 0x22f9c4 0x22f9c4
ebp 0x22f9c8 0x22f9c8
esi 0xc01b24 0xc01b24
edi 0xc01b3c 0xc01b3c
eip 0x696c8140 0x696c8140 <java::lang::Class*
java::lang::Object::getClass()>
eflags 0x10202 [ IF RF ]
cs 0x1b 0x1b
ss 0x23 0x23
ds 0x23 0x23
es 0x23 0x23
fs 0x3b 0x3b
gs 0x0 0x0
(gdb) set height 1000
(gdb) bt
#0 0x696c8140 in java::lang::Class* java::lang::Object::getClass() ()
from /cygdrive/d/cygwin/tmp/gcc/i686-pc-mingw32/libjava/.libs/libgcj-13.dll
#1 0x69ce1735 in ffi_call_win32 () at ../.././libffi/src/x86/win32.S:464
#2 0x69ce1608 in ffi_raw_call (cif=0xc01b24,
fn=0x696c8140 <java::lang::Class* java::lang::Object::getClass()>,
rvalue=0x22fbe8, fake_avalue=0x22fa54) at ../.././libffi/src/x86/ffi.c:832
#3 0x6969bd0e in _Jv_InterpMethod::run (retp=0x22fd50, args=0x22fd70,
meth=0xac9e10) at ../.././libjava/interpret-run.cc:611
#4 0x69ce1905 in ffi_closure_raw_SYSV () at ../.././libffi/src/x86/win32.S:749
#5 0x00fa0039 in ?? ()
#6 0x004087bf in ExtraClassLoader.main(java.lang.String[])void ()
at ExtraClassLoader.java:9
#7 0x696bd642 in gnu::java::lang::MainThread::call_main (this=0xc0ef60)
at ../.././libjava/gnu/java/lang/natMainThread.cc:54
#8 0x696fa4d6 in gnu.java.lang.MainThread.run()void (this=@c0ef60)
at /tmp/gcc/libjava/gnu/java/lang/MainThread.java:106
#9 0x696cc062 in _Jv_ThreadRun (thread=0xc0ef60)
at ../.././libjava/java/lang/natThread.cc:335
#10 0x69683f5d in _Jv_RunMain (vm_args=0x0, klass=klass@entry=0x40a160,
name=name@entry=0x0, argc=argc@entry=0x1, argv=argv@entry=0x3d8958,
is_jar=is_jar@entry=0x0) at ../.././libjava/prims.cc:1795
#11 0x69684156 in _Jv_RunMain (klass=klass@entry=0x40a160,
name=name@entry=0x0, argc=argc@entry=0x1, argv=argv@entry=0x3d8958,
is_jar=is_jar@entry=0x0) at ../.././libjava/prims.cc:1820
#12 0x696841bf in JvRunMain (klass=0x40a160, argc=0x1, argv=0x3d8958)
at ../.././libjava/prims.cc:1826
#13 0x00401402 in _fu0___Jv_Compiler_Properties () at /tmp/cckDh2w0.i:11
#14 0x004010fd in __mingw_CRTStartup () at ../../.././winsup/mingw/crt1.c:244
#15 0x00000408 in ?? ()
#16 0x7ffd7000 in ?? ()
#17 0x00000000 in ?? ()
Warning: the current language does not match this frame.
(gdb)
it seems that thiscall trampoline works correctly.
0x00fa0022 in ?? ()
4: $ebx = 0x696c5603
3: $ecx = 0x696c5603
2: $eax = 0xfa0008
1: x/i $eip
=> 0xfa0022: call 0x69ce18be <ffi_closure_SYSV+190>
(gdb)
0x69ce18be in ffi_closure_SYSV () at ../.././libffi/src/x86/win32.S:715
715 ret
4: $ebx = 0x696c5603
3: $ecx = 0x696c5603
2: $eax = 0xfa0008
1: x/i $eip
=> 0x69ce18be <ffi_closure_SYSV+190>:
jbe 0x69ce18c0 <ffi_closure_raw_SYSV>
(gdb) si
ffi_closure_raw_SYSV () at ../.././libffi/src/x86/win32.S:734
734 pushl %ebp
4: $ebx = 0x696c5603
3: $ecx = 0x696c5603
2: $eax = 0xfa0008
1: x/i $eip
=> 0x69ce18c0 <ffi_closure_raw_SYSV>: push %ebp
(gdb) b ffi_call_win32
Breakpoint 4 at 0x69ce16e3: file ../.././libffi/src/x86/win32.S, line 433.
(gdb) c
Continuing.
Breakpoint 4, ffi_call_win32 () at ../.././libffi/src/x86/win32.S:433
433 movl 20(%ebp),%ecx
4: $ebx = 0x1
3: $ecx = 0xe
2: $eax = 0x22fa0c
1: x/i $eip
=> 0x69ce16e3 <ffi_call_win32+3>: mov 0x14(%ebp),%ecx
(gdb) bt
#0 ffi_call_win32 () at ../.././libffi/src/x86/win32.S:433
#1 0x69ce15e8 in ffi_raw_call (cif=0xc01bec, fn=
0x696d4940 <java.lang.Object.Object()>, rvalue=0x22fbf0,
fake_avalue=0x22fa58) at ../.././libffi/src/x86/ffi.c:827
#2 0x6969bd0e in _Jv_InterpMethod::run (retp=0x22fd58, args=0x22fd78,
meth=0xac9e10) at ../.././libjava/interpret-run.cc:611
#3 0x69ce18e5 in ffi_closure_raw_SYSV () at ../.././libffi/src/x86/win32.S:749
#4 0x00fa0027 in ?? ()
#5 0x004087bf in ExtraClassLoader.main(java.lang.String[])void ()
at ExtraClassLoader.java:9
#6 0x696bd642 in gnu::java::lang::MainThread::call_main (this=0xc0ef60)
at ../.././libjava/gnu/java/lang/natMainThread.cc:54
#7 0x696fa4d6 in gnu.java.lang.MainThread.run()void (this=@c0ef60)
at /tmp/gcc/libjava/gnu/java/lang/MainThread.java:106
#8 0x696cc062 in _Jv_ThreadRun (thread=0xc0ef60)
at ../.././libjava/java/lang/natThread.cc:335
#9 0x69683f5d in _Jv_RunMain (vm_args=0x0, klass=klass@entry=0x40a160,
name=name@entry=0x0, argc=argc@entry=0x1, argv=argv@entry=0x3d8958,
is_jar=is_jar@entry=0x0) at ../.././libjava/prims.cc:1795
#10 0x69684156 in _Jv_RunMain (klass=klass@entry=0x40a160,
name=name@entry=0x0, argc=argc@entry=0x1, argv=argv@entry=0x3d8958,
is_jar=is_jar@entry=0x0) at ../.././libjava/prims.cc:1820
#11 0x696841bf in JvRunMain (klass=0x40a160, argc=0x1, argv=0x3d8958)
at ../.././libjava/prims.cc:1826
#12 0x00401402 in _fu0___Jv_Compiler_Properties () at /tmp/cckDh2w0.i:11
#13 0x004010fd in __mingw_CRTStartup () at ../../.././winsup/mingw/crt1.c:244
#14 0x00000408 in ?? ()
#15 0x7ffdd000 in ?? ()
#16 0x00000000 in ?? ()
(gdb) ni
ffi_prep_args (stack=0x22f9cc "\032", ecif=0x22fa0c)
at ../.././libffi/src/x86/ffi.c:46
warning: Source file is more recent than executable.
46 {
4: $ebx = 0x1
3: $ecx = 0x4
2: $eax = 0x22f9cc
1: x/i $eip
=> 0x69ce0eb0 <ffi_prep_args>: push %ebp
(gdb) finish
Run till exit from #0 ffi_prep_args (stack=0x22f9cc "\032", ecif=0x22fa0c)
at ../.././libffi/src/x86/ffi.c:46
ffi_call_win32 () at ../.././libffi/src/x86/win32.S:444
444 addl $8,%esp
4: $ebx = 0x1
3: $ecx = 0x1
2: $eax = 0xe
1: x/i $eip
=> 0x69ce16f1 <ffi_call_win32+17>: add $0x8,%esp
(gdb) ni
447 cmpl $3, 16(%ebp) # FFI_THISCALL
4: $ebx = 0x1
3: $ecx = 0x1
2: $eax = 0xe
1: x/i $eip
=> 0x69ce16f4 <ffi_call_win32+20>: cmpl $0x3,0x10(%ebp)
(gdb)
448 jz .do_thiscall
4: $ebx = 0x1
3: $ecx = 0x1
2: $eax = 0xe
1: x/i $eip
=> 0x69ce16f8 <ffi_call_win32+24>: je 0x69ce170c <ffi_call_win32+44>
(gdb)
456 movl (%esp), %ecx
4: $ebx = 0x1
3: $ecx = 0x1
2: $eax = 0xe
1: x/i $eip
=> 0x69ce170c <ffi_call_win32+44>: mov (%esp),%ecx
(gdb) x $esp
0x22f9cc: 0x8df4458b
parameter is broken for sure. please check ffi_prep_args
