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Message-ID: <92b45bdd-61d2-47e9-23c3-d1e299c482c1@web.de>
Date: Sun, 8 Oct 2017 20:57:36 +0200
From: Felix Hädicke <felixhaedicke@....de>
To: musl@...ts.openwall.com
Subject: SIGILL in setjmp() on ARM
Hello,
For the XCSoar open source software (https://xcsoar.org), we have a
version for Kobo eReader devices. We are currently using glibc for this,
but are trying to switch to musl.
However, for optimized builds, the program crashes with SIGILL in
setjmp(), which is called by the freetype library, which is used in our
program.
The following CFLAGS were used:
-march=armv7-a -mcpu=cortex-a8 -mfpu=neon -mfloat-abi=hard -mthumb
-fvisibility=hidden -Os -g
Everything (including musl and freetype) is linked statically.
Debian's "arm-linux-gnueabihf" toolchain is used for compiling, which
was configured with
--with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float=hard --with-mode=thumb
The Kobo Mini eReader which I use for testing, has a Freescale i.MX 5
(Cortex-A8). But the crash is reproducible on i.MX 6 based Kobo devices,
and even on QEMU, as well.
Disabling optimisation (flag "-O0" instead of "-Os"), or disabling Thumb
(flag "-marm") for musl solves the problem. However, doing this for
compiling the setjmp.s file only does not make a difference. And using
"-O1" instead of "-Os" does not help.
Find some GDB crash dump analysis below.
Regards,
Felix
Core was generated by `/mnt/onboard/xcsoar'.
Program terminated with signal SIGILL, Illegal instruction.
#0 setjmp () at
/home/felix/.tmp/xcsoar-merge-musl/output/src/musl-1.1.16/src/setjmp/arm/setjmp.s:35
35 stcl p1, cr10, [ip], #8
[Current thread is 1 (LWP 820)]
(gdb) bt
#0 setjmp () at
/home/felix/.tmp/xcsoar-merge-musl/output/src/musl-1.1.16/src/setjmp/arm/setjmp.s:35
#1 0x00135c04 in tt_face_build_cmaps (face=face@...ry=0x545880) at
/home/felix/.tmp/xcsoar-merge-musl/output/src/freetype-2.8/src/sfnt/ttcmap.c:3753
#2 0x00135f34 in sfnt_load_face (stream=<optimized out>, face=0x545880,
face_instance_index=<optimized out>, num_params=<optimized out>, params=0x0)
at
/home/felix/.tmp/xcsoar-merge-musl/output/src/freetype-2.8/src/sfnt/sfobjs.c:1470
#3 0x0012e7cc in tt_face_init (stream=<optimized out>, ttface=0x545880,
face_index=0, num_params=0, params=0x0) at
/home/felix/.tmp/xcsoar-merge-musl/output/src/freetype-2.8/src/truetype/ttobjs.c:596
#4 0x0012983e in open_face (driver=driver@...ry=0x5443b0,
astream=astream@...ry=0x7efdaaec,
external_stream=external_stream@...ry=0 '\000',
face_index=face_index@...ry=0, num_params=0, params=0x0,
aface=aface@...ry=0x7efdaaf0) at
/home/felix/.tmp/xcsoar-merge-musl/output/src/freetype-2.8/src/base/ftobjs.c:1195
#5 0x0012a34a in ft_open_face_internal (library=0x5442e0,
args=args@...ry=0x7efdac10, face_index=face_index@...ry=0,
aface=aface@...ry=0x7efdac3c, test_mac_fonts=test_mac_fonts@...ry=1 '\001')
at
/home/felix/.tmp/xcsoar-merge-musl/output/src/freetype-2.8/src/base/ftobjs.c:2267
#6 0x0012a686 in FT_New_Face (library=<optimized out>,
pathname=pathname@...ry=0x544710 "/opt/xcsoar/share/fonts/Vera.ttf",
face_index=face_index@...ry=0, aface=aface@...ry=0x7efdac3c)
at
/home/felix/.tmp/xcsoar-merge-musl/output/src/freetype-2.8/src/base/ftobjs.c:1258
#7 0x000c7a52 in FreeType::Load (path=path@...ry=0x544710
"/opt/xcsoar/share/fonts/Vera.ttf") at src/Screen/FreeType/Init.cpp:63
#8 0x000c757a in Font::LoadFile (this=0x52a27c <Fonts::map>,
file=0x544710 "/opt/xcsoar/share/fonts/Vera.ttf", ptsize=18,
bold=<optimized out>, italic=false) at src/Screen/FreeType/Font.cpp:157
#9 0x000c765a in Font::Load (this=this@...ry=0x52a27c <Fonts::map>,
d=...) at src/Screen/FreeType/Font.cpp:213
#10 0x00068eb8 in Fonts::Load (settings=...) at src/Look/GlobalFonts.cpp:36
#11 0x00068fe0 in Fonts::Initialize () at src/Look/DefaultFonts.cpp:52
#12 0x0006ae1c in MainWindow::Initialise (this=this@...ry=0x5451e0) at
src/MainWindow.cpp:196
#13 0x0006b8e4 in Startup () at src/Startup.cpp:231
#14 0x0001a800 in Main () at src/XCSoar.cpp:121
#15 main (argc=<optimized out>, argv=<optimized out>) at src/XCSoar.cpp:170
(gdb) disassemble
Dump of assembler code for function setjmp:
0x001968ce <+0>: mov r12, r0
0x001968d0 <+2>: stmia.w r12!, {r4, r5, r6, r7, r8, r9, r10, r11}
0x001968d4 <+6>: mov r2, sp
0x001968d6 <+8>: stmia.w r12!, {r2, lr}
0x001968da <+12>: mov.w r0, #0
0x001968de <+16>: add r1, pc, #60 ; (adr r1, 0x19691c
<setjmp+78>)
0x001968e0 <+18>: ldr r2, [pc, #60] ; (0x196920 <setjmp+82>)
0x001968e2 <+20>: ldr r1, [r1, r2]
0x001968e4 <+22>: tst.w r1, #608 ; 0x260
0x001968e8 <+26>: beq.n 0x19691c <setjmp+78>
0x001968ea <+28>: tst.w r1, #32
0x001968ee <+32>: beq.n 0x1968f4 <setjmp+38>
0x001968f0 <+34>: sfm f4, 4, [r12], #48 ; 0x30
0x001968f4 <+38>: tst.w r1, #64 ; 0x40
0x001968f8 <+42>: beq.n 0x1968fe <setjmp+48>
0x001968fa <+44>: vstmia r12!, {d8-d15}
0x001968fe <+48>: tst.w r1, #512 ; 0x200
0x00196902 <+52>: beq.n 0x19691c <setjmp+78>
=> 0x00196904 <+54>: stfp f2, [r12], #8
0x00196908 <+58>: stfp f3, [r12], #8
0x0019690c <+62>: stfp f4, [r12], #8
0x00196910 <+66>: stfp f5, [r12], #8
0x00196914 <+70>: stfp f6, [r12], #8
0x00196918 <+74>: stfp f7, [r12], #8
0x0019691c <+78>: bx lr
0x0019691e <+80>: eorseq r7, r10, r2, ror #20
0x00196922 <+84>: stmdbmi r4, {} ; <UNPREDICTABLE>
End of assembler dump.
(gdb) info registers
r0 0x0 0
r1 0x27af4601 665798145
r2 0x3a 58
r3 0x10c 268
r4 0x7efda7c0 2130552768
r5 0xa59 2649
r6 0x1 1
r7 0x0 0
r8 0x0 0
r9 0x0 0
r10 0x0 0
r11 0x219cf4 2202868
r12 0x7efda7e8 2130552808
sp 0x7efda778 0x7efda778
lr 0x135c05 1268741
pc 0x196904 0x196904 <setjmp+54>
cpsr 0x30 48
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