libphobos on ARM

[Andrew Wiley]

On Fri, Jun 1, 2012 at 3:24 PM, Alex Rønne Petersen <alex at lycus.org> wrote:

> On 01-06-2012 23:05, Matthew Caron wrote:
>
>> Hey folks,
>>
>> So, I've used the instructions and code here:
>>
>> https://bitbucket.org/goshawk/**gdc/wiki/crosstool-ng<https://bitbucket.org/goshawk/gdc/wiki/crosstool-ng>
>>
>> to build a gdc for ARM.
>>
>> I've written up a simple "Hello world" and I get an Illegal Instruction
>> when executing on my ARM Linux EABI system.
>>
>> GDB says (edited to remove standard stuff):
>>
>> ==
>> (gdb) run
>> Starting program: /hello
>>
>> Program received signal SIGILL, Illegal instruction.
>> 0x0002f5c4 in _D2gc3gcx2GC6mallocMFkkPkZPv (this=@0x96018, size=88,
>> bits=1,
>> alloc_size=0x0)
>> at
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/gc/gcx.d:1224
>>
>> 1224
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**libphobos/gc/gcx.d:
>> No
>> such file or directory.
>> in /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/gc/gcx.d
>> Current language: auto; currently minimal
>> (gdb) bt full
>> #0 0x0002f5c4 in _D2gc3gcx2GC6mallocMFkkPkZPv (this=@0x96018, size=88,
>> bits=1, alloc_size=0x0)
>> at
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/gc/gcx.d:1224
>>
>> No locals.
>> #1 0x0002692c in gc.gc.gc_malloc (sz=<value optimized out>,
>> ba=<value optimized out>)
>> at
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/gc/gc.d:201
>> No locals.
>> #2 0x00019ad0 in _d_newclass (ci=@0x8e8bc)
>> at
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/rt/lifetime.d:123
>>
>> p = Unhandled dwarf expression opcode 0x9f
>> ==
>>
>> So, the error is at line 1224 of gcx.d, which is:
>>
>> ==
>> /**
>> * add range to scan for roots
>> */
>> void addRange(void *p, size_t sz)
>> {
>> if (!p || !sz) // 1224
>> {
>> return;
>> }
>> ==
>>
>> The full backtrace is less than useful here, because of optimizations in
>> libphobos, so I've recompiled libphobos with -O0. Recompiling my program
>> and re-running it gives me:
>>
>> ==
>> (gdb) run
>> Starting program: /hello
>> Hello gents
>>
>> Program received signal SIGILL, Illegal instruction.
>> 0x0004535c in _**D2gc3gcx3Gcx16fullcollectshell**MFZk (this=Cannot access
>> memory at address 0x1
>> )
>> at
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/gc/gcx.d:245
>>
>> 245
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**libphobos/gc/gcx.d:
>> No
>> such file or directory.
>> in /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/gc/gcx.d
>> Current language: auto; currently minimal
>> (gdb) bt full
>> #0 0x0004535c in _**D2gc3gcx3Gcx16fullcollectshell**MFZk (this=Cannot
>> access
>> memory at address 0x1
>> )
>> at
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/gc/gcx.d:245
>>
>> No locals.
>> #1 0x000418ec in _**D2gc3gcx2GC18fullCollectNoStac**kMFZv (this=@0xe4018)
>> at
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/gc/gcx.d:245
>>
>> __sync33 = (struct TypeInfo_Class &) @0xdce4c: {init = {length = 8,
>> ptr = 0xbc81c "4�v"}, name = {length = 13,
>> ptr = 0xbc824 "gc.gcx.GCLock"}, vtbl = {length = 6, ptr = 0xbc834},
>> interfaces = {length = 0, ptr = 0x0}, base = @0xda804, destructor = 0x0,
>> classInvariant = 0, m_flags = 54, deallocator = 0x0, m_offTi = {length =
>> 0,
>> ptr = 0x0}, defaultConstructor = 0x0, xgetMembers = 0}
>> #2 0x0003ca34 in gc_term ()
>> at
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/gc/gc.d:133
>> No locals.
>> #3 0x00022e2c in rt.dmain2.main.runAll (this=0xbe9e7cd8)
>> at
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/rt/dmain2.d:67
>>
>> No locals.
>> #4 0x000227c4 in rt.dmain2.main.tryExec (this=0xbe9e7cd8, dg=
>> {object = 0xbe9e7cd8, func = 0x22d94 <rt.dmain2.main.runAll>})
>> ---Type <return> to continue, or q <return> to quit---
>> at
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/rt/dmain2.d:67
>>
>> No locals.
>> #5 0x000225ac in main (argc=1, argv=0xbe9e7e64)
>> at
>> /home/mattc/workspace/d/**buildder/.build/src/gcc-4.6.2/**
>> libphobos/rt/dmain2.d:67
>>
>> trapExceptions = true
>> am = (struct char[] *) 0xe4008
>> result = 0
>> args = {length = 1, ptr = 0xe4008}
>> ==
>>
>> This actually does print the "Hello gents" that it is supposed to, but
>> then dies after (likely when exiting and collecting all its memory).
>>
>> The line referenced is in the following:
>> ==
>> {{{
>> void initialize() // 245
>> {
>> gcLock = GCLock.classinfo;
>> gcx = cast(Gcx*)cstdlib.calloc(1, Gcx.sizeof);
>> if (!gcx)
>> onOutOfMemoryError();
>> gcx.initialize();
>> setStackBottom(rt_stackBottom(**));
>> }
>> }}}
>>
>> I should note that I tested the gcc which was built along with gdc and
>> it does produce a "Hello world" application which appears to work
>> correctly.
>>
>> Does anyone have any ideas/pointers/hey there, do it this way, dummy/etc?
>>
>
> Please try building libphobos and libdruntime with -fno-section-anchors.
>
>
You certainly need to do this, but -O0 means that section-anchors
optimization is turned off anyway, so that isn't actually your problem. Can
you run `disassemble` in gdb to see what the faulting instruction is?
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