Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
I have boiled down my problem to this democode. The problem is in the
begin line of set Direction. The sp gets moved to 0x0fff8f94 which is
unititialized Space before RAM.
The Reason is that the offset for the local var .Lj9 (.long -32840) is
plain wrong. It might be me doing something strange (Setting the record
to absolute) but this works fine on armv7m.
Jeppe, could you perhaps have a look, I compared with armv7m code and
there the whole handling of local vars seems to work totally different.
I am doing something unusual here, so another conclusion is that my
problem is most likely not related to the segfault described, sorry for
messing this thread up.
Michael
program hello;
{$mode objfpc}
{$modeswitch advancedrecords}
type
TGPIO_Bit = 0..11;
TGPIO_Direction = (GPIO_Input, GPIO_Output);
type
TGPIO_Registers = record
MASKED_ACCESS: array [0 .. 4095] of longword;
RESERVED1: array [0 .. 4095] of longword;
DIR : longword;
IS : longword;
IBE : longword;
IEV : longword;
IE : longword;
RIS : longword;
MIS : longword;
IC : longword;
procedure setDirection(bit : TGPIO_Bit; direction : TGPIO_Direction);
end;
const
LPC_AHB_BASE = $5000;
LPC_GPIO0_BASE = (LPC_AHB_BASE + $0);
var
GPIO0 : TGPIO_Registers absolute(LPC_GPIO0_BASE);
procedure TGPIO_Registers.setDirection(bit : TGPIO_Bit; direction :
TGPIO_Direction);
begin
DIR := DIR and (not (1 shl bit)) or (longWord(direction) shl bit);
end;
var
i : integer;
begin
i := 0;
GPIO0.setDirection(i,GPIO_Output);
end.
Am 13.01.14 15:39, schrieb Michael Ring:
I guess not, when I remember correctly this has already been repaired
for armv6m. The problem for me is that .Lj9 is defined as a negative
number. As a consequence r13 points to nirvana and
str r0,[r13, #8] creates an Exception.
# [87] begin
push{r4,r14}
ldr r4,.Lj9
add r13,r13,r4
# Var bit located at r13+0
# Var direction located at r13+4
# Var $self located at r13+8
str r0,[r13, #8]
strbr1,[r13]
str r2,[r13, #4]
.Ll2:
.
.Lj9:
.long -32840
.Lj7:
.long 32768
.Lj10:
.long 32840
.Lt2:
Am 13.01.14 15:15, schrieb Jeppe Græsdal Johansen:
Might be related to the mla/mls optimization which somehow has been
enabled even though it's still broken
- Reply message -
Fra: Reinier Olislagers reinierolislag...@gmail.com
Dato: man., jan. 13, 2014 13:44
Emne: [fpc-pascal] ARM Linux crosscompiler: compiles but...
executable gives segmentation fault
Til: fpc-pascal@lists.freepascal.org
On 13/01/2014 12:34, Michael Ring wrote:
I had a look at armv6m yesterday evening, parts of my code run fine in
gdb, the code crashes in the init of a procedure when trying to prepare
the access to contents of a set.
The address of the set seems to get calculated totally wrong ending up
in a memory access at the end of the chip's address range.
Not sure if this is related to your problem, I will try to boil
down the
example to a bare minimum to see where the generated code differs
between armv7m and armv6m.
Thanks a lot, Michael!
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Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
On 10/01/2014 13:27, Reinier Olislagers wrote: Thanks to earlier help I got to build an ARM Linux cross compiler module in fpcup which even compiles fpcup itself (both using trunk and stable starting compiler): opt=-fPIC -dFPC_ARMHF crossopt=-CpARMV6 -CaEABIHF -CfVFPV2 fpc -g -gl -Tlinux -Parm simple.lpr Question: should I have compiled with -fPIC? Just tried without -fPIC, and -CpARMV6Z=compiles and runs nicely Rest of the options the same. Tried again with -fPIC, -CpARMV6Z=segmentation fault. So I'll just leave -fPIC off then Could also cross-compile fpcup (which uses lclbase) and it seems to run. @Michael, Jeppe etc: thanks a lot for the help, and hope the other problem gets solved. Thanks a lot, Reinier ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
Should be fixed now. The cpupi code estimated that it needed a copy of
the TGPIO_Registers record on the stack even though it was passed by
reference :)
Den 14-01-2014 09:47, Michael Ring skrev:
I have boiled down my problem to this democode. The problem is in the
begin line of set Direction. The sp gets moved to 0x0fff8f94 which is
unititialized Space before RAM.
The Reason is that the offset for the local var .Lj9 (.long -32840) is
plain wrong. It might be me doing something strange (Setting the
record to absolute) but this works fine on armv7m.
Jeppe, could you perhaps have a look, I compared with armv7m code and
there the whole handling of local vars seems to work totally different.
I am doing something unusual here, so another conclusion is that my
problem is most likely not related to the segfault described, sorry
for messing this thread up.
Michael
program hello;
{$mode objfpc}
{$modeswitch advancedrecords}
type
TGPIO_Bit = 0..11;
TGPIO_Direction = (GPIO_Input, GPIO_Output);
type
TGPIO_Registers = record
MASKED_ACCESS: array [0 .. 4095] of longword;
RESERVED1: array [0 .. 4095] of longword;
DIR : longword;
IS : longword;
IBE : longword;
IEV : longword;
IE : longword;
RIS : longword;
MIS : longword;
IC : longword;
procedure setDirection(bit : TGPIO_Bit; direction : TGPIO_Direction);
end;
const
LPC_AHB_BASE = $5000;
LPC_GPIO0_BASE = (LPC_AHB_BASE + $0);
var
GPIO0 : TGPIO_Registers absolute(LPC_GPIO0_BASE);
procedure TGPIO_Registers.setDirection(bit : TGPIO_Bit; direction :
TGPIO_Direction);
begin
DIR := DIR and (not (1 shl bit)) or (longWord(direction) shl bit);
end;
var
i : integer;
begin
i := 0;
GPIO0.setDirection(i,GPIO_Output);
end.
Am 13.01.14 15:39, schrieb Michael Ring:
I guess not, when I remember correctly this has already been repaired
for armv6m. The problem for me is that .Lj9 is defined as a negative
number. As a consequence r13 points to nirvana and
str r0,[r13, #8] creates an Exception.
# [87] begin
push{r4,r14}
ldr r4,.Lj9
add r13,r13,r4
# Var bit located at r13+0
# Var direction located at r13+4
# Var $self located at r13+8
str r0,[r13, #8]
strbr1,[r13]
str r2,[r13, #4]
.Ll2:
.
.Lj9:
.long -32840
.Lj7:
.long 32768
.Lj10:
.long 32840
.Lt2:
Am 13.01.14 15:15, schrieb Jeppe Græsdal Johansen:
Might be related to the mla/mls optimization which somehow has been
enabled even though it's still broken
- Reply message -
Fra: Reinier Olislagers reinierolislag...@gmail.com
Dato: man., jan. 13, 2014 13:44
Emne: [fpc-pascal] ARM Linux crosscompiler: compiles but...
executable gives segmentation fault
Til: fpc-pascal@lists.freepascal.org
On 13/01/2014 12:34, Michael Ring wrote:
I had a look at armv6m yesterday evening, parts of my code run fine in
gdb, the code crashes in the init of a procedure when trying to
prepare
the access to contents of a set.
The address of the set seems to get calculated totally wrong ending up
in a memory access at the end of the chip's address range.
Not sure if this is related to your problem, I will try to boil
down the
example to a bare minimum to see where the generated code differs
between armv7m and armv6m.
Thanks a lot, Michael!
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Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
One day (In a far far away future) I will understand how this whole
compiler magic works ;-)
Thank you very much for your fix, the LED's on my Board are not (yet)
blinking, but at least now the code seems to run fine in gdb.
Have a nice evening, will contact you when I have a little more code
working for nxp and stm chips...
Michael
Am 14.01.14 20:29, schrieb Jeppe Græsdal Johansen:
Should be fixed now. The cpupi code estimated that it needed a copy of
the TGPIO_Registers record on the stack even though it was passed by
reference :)
Den 14-01-2014 09:47, Michael Ring skrev:
I have boiled down my problem to this democode. The problem is in the
begin line of set Direction. The sp gets moved to 0x0fff8f94 which is
unititialized Space before RAM.
The Reason is that the offset for the local var .Lj9 (.long -32840)
is plain wrong. It might be me doing something strange (Setting the
record to absolute) but this works fine on armv7m.
Jeppe, could you perhaps have a look, I compared with armv7m code and
there the whole handling of local vars seems to work totally different.
I am doing something unusual here, so another conclusion is that my
problem is most likely not related to the segfault described, sorry
for messing this thread up.
Michael
program hello;
{$mode objfpc}
{$modeswitch advancedrecords}
type
TGPIO_Bit = 0..11;
TGPIO_Direction = (GPIO_Input, GPIO_Output);
type
TGPIO_Registers = record
MASKED_ACCESS: array [0 .. 4095] of longword;
RESERVED1: array [0 .. 4095] of longword;
DIR : longword;
IS : longword;
IBE : longword;
IEV : longword;
IE : longword;
RIS : longword;
MIS : longword;
IC : longword;
procedure setDirection(bit : TGPIO_Bit; direction : TGPIO_Direction);
end;
const
LPC_AHB_BASE = $5000;
LPC_GPIO0_BASE = (LPC_AHB_BASE + $0);
var
GPIO0 : TGPIO_Registers absolute(LPC_GPIO0_BASE);
procedure TGPIO_Registers.setDirection(bit : TGPIO_Bit; direction :
TGPIO_Direction);
begin
DIR := DIR and (not (1 shl bit)) or (longWord(direction) shl bit);
end;
var
i : integer;
begin
i := 0;
GPIO0.setDirection(i,GPIO_Output);
end.
Am 13.01.14 15:39, schrieb Michael Ring:
I guess not, when I remember correctly this has already been
repaired for armv6m. The problem for me is that .Lj9 is defined as a
negative number. As a consequence r13 points to nirvana and
str r0,[r13, #8] creates an Exception.
# [87] begin
push{r4,r14}
ldr r4,.Lj9
add r13,r13,r4
# Var bit located at r13+0
# Var direction located at r13+4
# Var $self located at r13+8
str r0,[r13, #8]
strbr1,[r13]
str r2,[r13, #4]
.Ll2:
.
.Lj9:
.long -32840
.Lj7:
.long 32768
.Lj10:
.long 32840
.Lt2:
Am 13.01.14 15:15, schrieb Jeppe Græsdal Johansen:
Might be related to the mla/mls optimization which somehow has been
enabled even though it's still broken
- Reply message -
Fra: Reinier Olislagers reinierolislag...@gmail.com
Dato: man., jan. 13, 2014 13:44
Emne: [fpc-pascal] ARM Linux crosscompiler: compiles but...
executable gives segmentation fault
Til: fpc-pascal@lists.freepascal.org
On 13/01/2014 12:34, Michael Ring wrote:
I had a look at armv6m yesterday evening, parts of my code run
fine in
gdb, the code crashes in the init of a procedure when trying to
prepare
the access to contents of a set.
The address of the set seems to get calculated totally wrong
ending up
in a memory access at the end of the chip's address range.
Not sure if this is related to your problem, I will try to boil
down the
example to a bare minimum to see where the generated code differs
between armv7m and armv6m.
Thanks a lot, Michael!
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Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
I had a look at armv6m yesterday evening, parts of my code run fine in gdb, the code crashes in the init of a procedure when trying to prepare the access to contents of a set. The address of the set seems to get calculated totally wrong ending up in a memory access at the end of the chip's address range. Not sure if this is related to your problem, I will try to boil down the example to a bare minimum to see where the generated code differs between armv7m and armv6m. Michael Am 11.01.14 14:17, schrieb Reinier Olislagers: On 11/01/2014 14:03, Florian Klämpfl wrote: Just type fpc -i to see the possible options. If one does not understand those options, one does not need them :) I had a suspicion you were going to say that ;) As said, arm targets are very different and every target has its optimal parameters. Exactly. Having some additional info IMO helps to at least verify the choice somebody else made in his script/wiki page/build tool is correct ;) E.g. on my NAS running debian 6.0 I build for thumb with CROSSOPT=-O4 -Cparmv5te -CIthumb and for normal arm with CROSSOPT=-O4 -Cparmv5te Depending on the distro, one needs different -Fl switches etc. Not to talk about different OSes. Yep. -Fl is covered in the cross compiling article, of course also in the build faq. Yes. But in my opinion then this info should go to the raspi page. I bet 99% of the raspi users don't know what instruction set the raspi needs. So explaining that -Cparmv6 turns on armv6 code generation does not help them :) Ehm, this is exactly why I didn't put it on the raspi page ;)... but a link from there to the current page would be nice... So when /is/ specifying the ABI needed? When supporting a microcontroller? Seriously: if you want to use an armel compiler to build e.g. for armhf. Ok. But then you probably want to have also some other defines and you really have to know what you are doing. Or if you have a special armel setup where you want to use hard float code and abi for speed reasons, e.g. when having softfloat raspberry debian installed. But these are special setups, officially not supported. Got it. Not interested in going that deep ;) ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
On 13/01/2014 12:34, Michael Ring wrote: I had a look at armv6m yesterday evening, parts of my code run fine in gdb, the code crashes in the init of a procedure when trying to prepare the access to contents of a set. The address of the set seems to get calculated totally wrong ending up in a memory access at the end of the chip's address range. Not sure if this is related to your problem, I will try to boil down the example to a bare minimum to see where the generated code differs between armv7m and armv6m. Thanks a lot, Michael! ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
Might be related to the mla/mls optimization which somehow has been enabled even though it's still broken - Reply message - Fra: Reinier Olislagers reinierolislag...@gmail.com Dato: man., jan. 13, 2014 13:44 Emne: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault Til: fpc-pascal@lists.freepascal.org On 13/01/2014 12:34, Michael Ring wrote: I had a look at armv6m yesterday evening, parts of my code run fine in gdb, the code crashes in the init of a procedure when trying to prepare the access to contents of a set. The address of the set seems to get calculated totally wrong ending up in a memory access at the end of the chip's address range. Not sure if this is related to your problem, I will try to boil down the example to a bare minimum to see where the generated code differs between armv7m and armv6m. Thanks a lot, Michael! ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
I guess not, when I remember correctly this has already been repaired
for armv6m. The problem for me is that .Lj9 is defined as a negative
number. As a consequence r13 points to nirvana and
str r0,[r13, #8] creates an Exception.
# [87] begin
push{r4,r14}
ldr r4,.Lj9
add r13,r13,r4
# Var bit located at r13+0
# Var direction located at r13+4
# Var $self located at r13+8
str r0,[r13, #8]
strbr1,[r13]
str r2,[r13, #4]
.Ll2:
.
.Lj9:
.long -32840
.Lj7:
.long 32768
.Lj10:
.long 32840
.Lt2:
Am 13.01.14 15:15, schrieb Jeppe Græsdal Johansen:
Might be related to the mla/mls optimization which somehow has been
enabled even though it's still broken
- Reply message -
Fra: Reinier Olislagers reinierolislag...@gmail.com
Dato: man., jan. 13, 2014 13:44
Emne: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable
gives segmentation fault
Til: fpc-pascal@lists.freepascal.org
On 13/01/2014 12:34, Michael Ring wrote:
I had a look at armv6m yesterday evening, parts of my code run fine in
gdb, the code crashes in the init of a procedure when trying to prepare
the access to contents of a set.
The address of the set seems to get calculated totally wrong ending up
in a memory access at the end of the chip's address range.
Not sure if this is related to your problem, I will try to boil down the
example to a bare minimum to see where the generated code differs
between armv7m and armv6m.
Thanks a lot, Michael!
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Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
On 11/01/2014 08:02, Florian Klämpfl wrote: Am 10.01.2014 13:27, schrieb Reinier Olislagers: crossopt=-CpARMV6 -CaEABIHF -CfVFPV2 The eabihf switch is not needed if the cross compiler is build with -dFPC_ARMHF. Though it shouldn't change anything regarding the crash. Thanks. As I couldn't find any existing docs, I've started this page: http://wiki.lazarus.freepascal.org/ARM_compiler_options Please feel free, as usual, to modify with corrections/additions. ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
Am 11.01.2014 11:14, schrieb Reinier Olislagers: On 11/01/2014 08:02, Florian Klämpfl wrote: Am 10.01.2014 13:27, schrieb Reinier Olislagers: crossopt=-CpARMV6 -CaEABIHF -CfVFPV2 The eabihf switch is not needed if the cross compiler is build with -dFPC_ARMHF. Though it shouldn't change anything regarding the crash. Thanks. As I couldn't find any existing docs, I've started this page: http://wiki.lazarus.freepascal.org/ARM_compiler_options Hmm, is this really needed? It clutters only information. I would completly remove the page and collect only the needed parameters for particular targets at their page because every arm target is different. Please feel free, as usual, to modify with corrections/additions. I see so need for the abi documention. Specifing the abi is normally not needed. It confuses only. ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
On 11/01/2014 13:32, Florian Klämpfl wrote: Am 11.01.2014 11:14, schrieb Reinier Olislagers: On 11/01/2014 08:02, Florian Klämpfl wrote: Am 10.01.2014 13:27, schrieb Reinier Olislagers: As I couldn't find any existing docs, I've started this page: http://wiki.lazarus.freepascal.org/ARM_compiler_options First off, thanks again for responding - I do really appreciate solid info from people who really know what's going on ;) Hmm, is this really needed? I actually would expect something like that in fpc docs, yes. It clutters only information. I would completly remove the page and collect only the needed parameters for particular targets at their page because every arm target is different. Well, that depends on your point of view - I think it nicely bundles information in one spot. Also, there may not be pages for all options (ARMv7 for example). People compiling e.g. for Raspberry Pi may not care what all the options do but they would if they changed from e.g. the original softfloat raspberry debian to raspbian which has hardfloat. Having this kind of page IMO helps clarify nicely what the options are. Please feel free, as usual, to modify with corrections/additions. I see so need for the abi documention. Specifing the abi is normally not needed. It confuses only. Well, I wouldn't know. I'm just collecting snippets from all over the wiki, forum posts, mailing lists and trying to make sense out of them (like the EABIHF versus -dFPC_ARMHF thing). Sort of trying to demistify a cargo cult Of course, I'll be happy to add a note saying that specifying the ABI normally is not needed - that'll save some other poor soul from wondering whether it's him, the phase of the moon or the wrong ABI parameter that caused the compiler to catch fire ;) So when /is/ specifying the ABI needed? When supporting a microcontroller? ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
Am 11.01.2014 13:38, schrieb Reinier Olislagers: On 11/01/2014 13:32, Florian Klämpfl wrote: Am 11.01.2014 11:14, schrieb Reinier Olislagers: On 11/01/2014 08:02, Florian Klämpfl wrote: Am 10.01.2014 13:27, schrieb Reinier Olislagers: As I couldn't find any existing docs, I've started this page: http://wiki.lazarus.freepascal.org/ARM_compiler_options First off, thanks again for responding - I do really appreciate solid info from people who really know what's going on ;) Hmm, is this really needed? I actually would expect something like that in fpc docs, yes. Just type fpc -i to see the possible options. If one does not understand those options, one does not need them :) It clutters only information. I would completly remove the page and collect only the needed parameters for particular targets at their page because every arm target is different. Well, that depends on your point of view - I think it nicely bundles information in one spot. Also, there may not be pages for all options (ARMv7 for example). As said, arm targets are very different and every target has its optimal parameters. E.g. on my NAS running debian 6.0 I build for thumb with CROSSOPT=-O4 -Cparmv5te -CIthumb and for normal arm with CROSSOPT=-O4 -Cparmv5te Depending on the distro, one needs different -Fl switches etc. Not to talk about different OSes. People compiling e.g. for Raspberry Pi may not care what all the options do but they would if they changed from e.g. the original softfloat raspberry debian to raspbian which has hardfloat. Having this kind of page IMO helps clarify nicely what the options are. Yes. But in my opinion then this info should go to the raspi page. I bet 99% of the raspi users don't know what instruction set the raspi needs. So explaining that -Cparmv6 turns on armv6 code generation does not help them :) Please feel free, as usual, to modify with corrections/additions. I see so need for the abi documention. Specifing the abi is normally not needed. It confuses only. Well, I wouldn't know. I'm just collecting snippets from all over the wiki, forum posts, mailing lists and trying to make sense out of them (like the EABIHF versus -dFPC_ARMHF thing). Yes, this unneeded -Caeabihf parameter floats around for years already :( Sort of trying to demistify a cargo cult Of course, I'll be happy to add a note saying that specifying the ABI normally is not needed - that'll save some other poor soul from wondering whether it's him, the phase of the moon or the wrong ABI parameter that caused the compiler to catch fire ;) So when /is/ specifying the ABI needed? When supporting a microcontroller? Simple: if you don't know when it's needed, you don't need it ;) Seriously: if you want to use an armel compiler to build e.g. for armhf. But then you probably want to have also some other defines and you really have to know what you are doing. Or if you have a special armel setup where you want to use hard float code and abi for speed reasons, e.g. when having softfloat raspberry debian installed. But these are special setups, officially not supported. ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
On 11/01/2014 14:03, Florian Klämpfl wrote: Just type fpc -i to see the possible options. If one does not understand those options, one does not need them :) I had a suspicion you were going to say that ;) As said, arm targets are very different and every target has its optimal parameters. Exactly. Having some additional info IMO helps to at least verify the choice somebody else made in his script/wiki page/build tool is correct ;) E.g. on my NAS running debian 6.0 I build for thumb with CROSSOPT=-O4 -Cparmv5te -CIthumb and for normal arm with CROSSOPT=-O4 -Cparmv5te Depending on the distro, one needs different -Fl switches etc. Not to talk about different OSes. Yep. -Fl is covered in the cross compiling article, of course also in the build faq. Yes. But in my opinion then this info should go to the raspi page. I bet 99% of the raspi users don't know what instruction set the raspi needs. So explaining that -Cparmv6 turns on armv6 code generation does not help them :) Ehm, this is exactly why I didn't put it on the raspi page ;)... but a link from there to the current page would be nice... So when /is/ specifying the ABI needed? When supporting a microcontroller? Seriously: if you want to use an armel compiler to build e.g. for armhf. Ok. But then you probably want to have also some other defines and you really have to know what you are doing. Or if you have a special armel setup where you want to use hard float code and abi for speed reasons, e.g. when having softfloat raspberry debian installed. But these are special setups, officially not supported. Got it. Not interested in going that deep ;) ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
[fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
Hi all,
For the Dutch among us: de dag die je wist dat zou komen...
Thanks to earlier help I got to build an ARM Linux cross compiler module
in fpcup which even compiles fpcup itself (both using trunk and stable
starting compiler):
opt=-fPIC -dFPC_ARMHF
crossopt=-CpARMV6 -CaEABIHF -CfVFPV2
fpc -g -gl -Tlinux -Parm simple.lpr
Question: should I have compiled with -fPIC?
Uploaded resulting executable
http://ubuntuone.com/0y3yXGcU8fEXR6OTMyvfGN
The program:
program simple;
begin
writeln('hello');
end.
Relevant fpc.cfg snippet:
#IFDEF CPUARM
#IFDEF LINUX
-CpARMV6
-CaEABIHF
-CfVFPV2
-FDC:\development\cross\bin\arm-linux\
-XParm-linux-
-Xd
-FlC:\development\cross\lib\arm-linux\
-Xr/usr/lib
#ENDIF
#ENDIF
However, running the resulting binary on my virtual Raspbian fails with
a segmentation fault. Running under gdb gives
(gdb) run
Starting program: /root/simple
Program received signal SIGSEGV, Segmentation fault.
0x0002b6e4 in
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR ()
(gdb) bt
#0 0x0002b6e4 in
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR ()
#1 0x8124 in _start ()
On the raspbian (which is built on hardfloat), file gives
simple: ELF 32-bit LSB executable, ARM, version 1 (SYSV), statically
linked, for GNU/Linux 2.0.0, not stripped
Compare with system-provided binary:
file /usr/bin/yes
/usr/bin/yes: ELF 32-bit LSB executable, ARM, version 1 (SYSV),
dynamically linked (uses shared libs), for GNU/Linux 2.6.26,
BuildID[sha1]=0xf2df9a56df5c7b5490f7dba10f2163acb8971fce, stripped
Question: should I be worried about the GNU/Linux 2.0.0 above?
ldd simple
not a dynamic executable
I've run
readelf -a simple
uploaded to
http://ubuntuone.com/1cAX24nbcPkGo05fFWDbOr
readelf -a /usr/bin/yes
uploaded to
http://ubuntuone.com/6FD65xgakyE9eZOIme2z47
Question: what steps should I take now?
Thanks
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Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
I think this is an ARMV6 specific Problem, I also realized while
debugging on embedded target that it does not work anymore, same code
compiled for ARMV7 debugs (and runs) just fine...
Until now I did not find the time to search for the revision that broke
armv6m.
Michael
Am 10.01.14 13:27, schrieb Reinier Olislagers:
Hi all,
For the Dutch among us: de dag die je wist dat zou komen...
Thanks to earlier help I got to build an ARM Linux cross compiler module
in fpcup which even compiles fpcup itself (both using trunk and stable
starting compiler):
opt=-fPIC -dFPC_ARMHF
crossopt=-CpARMV6 -CaEABIHF -CfVFPV2
fpc -g -gl -Tlinux -Parm simple.lpr
Question: should I have compiled with -fPIC?
Uploaded resulting executable
http://ubuntuone.com/0y3yXGcU8fEXR6OTMyvfGN
The program:
program simple;
begin
writeln('hello');
end.
Relevant fpc.cfg snippet:
#IFDEF CPUARM
#IFDEF LINUX
-CpARMV6
-CaEABIHF
-CfVFPV2
-FDC:\development\cross\bin\arm-linux\
-XParm-linux-
-Xd
-FlC:\development\cross\lib\arm-linux\
-Xr/usr/lib
#ENDIF
#ENDIF
However, running the resulting binary on my virtual Raspbian fails with
a segmentation fault. Running under gdb gives
(gdb) run
Starting program: /root/simple
Program received signal SIGSEGV, Segmentation fault.
0x0002b6e4 in
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR ()
(gdb) bt
#0 0x0002b6e4 in
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR ()
#1 0x8124 in _start ()
On the raspbian (which is built on hardfloat), file gives
simple: ELF 32-bit LSB executable, ARM, version 1 (SYSV), statically
linked, for GNU/Linux 2.0.0, not stripped
Compare with system-provided binary:
file /usr/bin/yes
/usr/bin/yes: ELF 32-bit LSB executable, ARM, version 1 (SYSV),
dynamically linked (uses shared libs), for GNU/Linux 2.6.26,
BuildID[sha1]=0xf2df9a56df5c7b5490f7dba10f2163acb8971fce, stripped
Question: should I be worried about the GNU/Linux 2.0.0 above?
ldd simple
not a dynamic executable
I've run
readelf -a simple
uploaded to
http://ubuntuone.com/1cAX24nbcPkGo05fFWDbOr
readelf -a /usr/bin/yes
uploaded to
http://ubuntuone.com/6FD65xgakyE9eZOIme2z47
Question: what steps should I take now?
Thanks
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Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
On 10/01/2014 13:39, Michael Ring wrote: I think this is an ARMV6 specific Problem, I also realized while debugging on embedded target that it does not work anymore, same code compiled for ARMV7 debugs (and runs) just fine... Until now I did not find the time to search for the revision that broke armv6m. Michael Thanks Michael, guess I'll have to abandon my virtual Raspberry... or slowly bisect trunk revisions ;) ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
-Message d'origine-
De : fpc-pascal-boun...@lists.freepascal.org [mailto:fpc-pascal-
boun...@lists.freepascal.org] De la part de Michael Ring
Envoyé : vendredi 10 janvier 2014 13:40
À : FPC-Pascal users discussions
Objet : Re: [fpc-pascal] ARM Linux crosscompiler: compiles but...
executable gives segmentation fault
I think this is an ARMV6 specific Problem, I also realized while
debugging on embedded target that it does not work anymore, same code
compiled for ARMV7 debugs (and runs) just fine...
Until now I did not find the time to search for the revision that broke
armv6m.
Michael
Am 10.01.14 13:27, schrieb Reinier Olislagers:
Hi all,
For the Dutch among us: de dag die je wist dat zou komen...
Thanks to earlier help I got to build an ARM Linux cross compiler
module
in fpcup which even compiles fpcup itself (both using trunk and
stable
starting compiler):
opt=-fPIC -dFPC_ARMHF
crossopt=-CpARMV6 -CaEABIHF -CfVFPV2
fpc -g -gl -Tlinux -Parm simple.lpr
Question: should I have compiled with -fPIC?
Uploaded resulting executable
http://ubuntuone.com/0y3yXGcU8fEXR6OTMyvfGN
The program:
program simple;
begin
writeln('hello');
end.
Relevant fpc.cfg snippet:
#IFDEF CPUARM
#IFDEF LINUX
-CpARMV6
-CaEABIHF
-CfVFPV2
-FDC:\development\cross\bin\arm-linux\
-XParm-linux-
-Xd
-FlC:\development\cross\lib\arm-linux\
-Xr/usr/lib
#ENDIF
#ENDIF
However, running the resulting binary on my virtual Raspbian fails
with
a segmentation fault. Running under gdb gives
(gdb) run
Starting program: /root/simple
Program received signal SIGSEGV, Segmentation fault.
0x0002b6e4 in
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR ()
Maybe it is just using an unsupported instruction?
what does x /10i $pc return?
Pierre Muller
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Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
It looked more like the stack got messed up, for me it crashed after the
second (if I remember correctly) procedure was called. I can dig into
this on Sunday evening, after returning to my home.
Michael
Am 10.01.14 14:29, schrieb Pierre Free Pascal:
-Message d'origine-
De : fpc-pascal-boun...@lists.freepascal.org [mailto:fpc-pascal-
boun...@lists.freepascal.org] De la part de Michael Ring
Envoyé : vendredi 10 janvier 2014 13:40
À : FPC-Pascal users discussions
Objet : Re: [fpc-pascal] ARM Linux crosscompiler: compiles but...
executable gives segmentation fault
I think this is an ARMV6 specific Problem, I also realized while
debugging on embedded target that it does not work anymore, same code
compiled for ARMV7 debugs (and runs) just fine...
Until now I did not find the time to search for the revision that broke
armv6m.
Michael
Am 10.01.14 13:27, schrieb Reinier Olislagers:
Hi all,
For the Dutch among us: de dag die je wist dat zou komen...
Thanks to earlier help I got to build an ARM Linux cross compiler
module
in fpcup which even compiles fpcup itself (both using trunk and
stable
starting compiler):
opt=-fPIC -dFPC_ARMHF
crossopt=-CpARMV6 -CaEABIHF -CfVFPV2
fpc -g -gl -Tlinux -Parm simple.lpr
Question: should I have compiled with -fPIC?
Uploaded resulting executable
http://ubuntuone.com/0y3yXGcU8fEXR6OTMyvfGN
The program:
program simple;
begin
writeln('hello');
end.
Relevant fpc.cfg snippet:
#IFDEF CPUARM
#IFDEF LINUX
-CpARMV6
-CaEABIHF
-CfVFPV2
-FDC:\development\cross\bin\arm-linux\
-XParm-linux-
-Xd
-FlC:\development\cross\lib\arm-linux\
-Xr/usr/lib
#ENDIF
#ENDIF
However, running the resulting binary on my virtual Raspbian fails
with
a segmentation fault. Running under gdb gives
(gdb) run
Starting program: /root/simple
Program received signal SIGSEGV, Segmentation fault.
0x0002b6e4 in
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR ()
Maybe it is just using an unsupported instruction?
what does x /10i $pc return?
Pierre Muller
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Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
On 10/01/2014 14:29, Pierre Free Pascal wrote:
Am 10.01.14 13:27, schrieb Reinier Olislagers:
a segmentation fault. Running under gdb gives
(gdb) run
Starting program: /root/simple
Program received signal SIGSEGV, Segmentation fault.
0x0002b6e4 in
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR ()
Maybe it is just using an unsupported instruction?
what does x /10i $pc return?
(gdb) run
Starting program: /root/simple
Program received signal SIGSEGV, Segmentation fault.
0x0002b6e4 in
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR ()
(gdb) bt
#0 0x0002b6e4 in
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR ()
#1 0x8124 in _start ()
(gdb) x /10i $pc
= 0x2b6e4
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR+168:
str r0, [r2, r1]
0x2b6e8
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR+172:
ldr r7, [r11, #-48] ; 0x30
0x2b6ec
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR+176:
mov r0, r7
0x2b6f0
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR+180:
ldmdb r11, {r4, r5, r6, r7, r8, r9, r11, sp, pc}
0x2b6f4
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR+184:
andeq r7, r1, r4, lsr #23
0x2b6f8
SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR+188:
andeq r0, r0, r0, ror #4
0x2b6fc SYSTEM_$$_STRINGTOPPCHAR$ANSISTRING$SMALLINT$$PPCHAR:
push{r4, lr}
0x2b700 SYSTEM_$$_STRINGTOPPCHAR$ANSISTRING$SMALLINT$$PPCHAR+4:
ldr r4, [pc, #24] ; 0x2b720
SYSTEM_$$_STRINGTOPPCHAR$ANSISTRING$SMALLINT$$PPCHAR+36
0x2b704 SYSTEM_$$_STRINGTOPPCHAR$ANSISTRING$SMALLINT$$PPCHAR+8:
add r4, pc, r4
0x2b708 SYSTEM_$$_STRINGTOPPCHAR$ANSISTRING$SMALLINT$$PPCHAR+12:
ldr r0, [r0]
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Re: [fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault
Am 10.01.2014 13:27, schrieb Reinier Olislagers: crossopt=-CpARMV6 -CaEABIHF -CfVFPV2 The eabihf switch is not needed if the cross compiler is build with -dFPC_ARMHF. Though it shouldn't change anything regarding the crash. ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
