[LLVMdev] ARM assembler's syntax in clang

[Ashi]

Hi, all. The previous post have a typo:

problem in ARM assembly: I use LDR to load an external symbol :

LDR         R7,=DataTable

But clang gives error: unexpected token in operand to the '=',
Then I change the code to:

LDR         R7,DataTable

The error becomes: unsupported relocation on symbol. How can I get around
this in clang? My problem is actually how to load external symbol in
Clang's integrated-as? I've tried to learn some trivial c code's assembly
output, but find there are many linker related symbol and really confusing.

Thanks in advance!




On Mon, Mar 4, 2013 at 4:48 PM, Ashi <ashi08104 at gmail.com> wrote:

> Hi, all. Another problem in ARM assembly: I use LDR to load an external
> symbol :
>
> LDR         R7,=DataTable
>
> But clang gives error: unexpected token in operand to the '=',
> Then I change the code to:
>
> LDR         R7,=DataTable
>
> The error becomes: unsupported relocation on symbol. How can I get around
> this in clang?
>
> Thanks in advance!
>
> On Mon, Feb 25, 2013 at 7:14 PM, Ashi <ashi08104 at gmail.com> wrote:
>
>> Hi,all,
>> I've some problem when using clang compile my ARM assembly code:
>>
>> 1 .qn directive
>> In GAS, .qn directive is used to create typed and/or indexed register
>> aliases for use in Advanced SIMD Extension (Neon) instructions.(
>> http://sourceware.org/binutils/docs/as/ARM-Directives.html#ARM-Directives
>> )
>> But clang's integrated-as seems have different syntax, for example, my
>> code:
>>
>> input .qn Q6.F32
>>
>> Clang would give error: unexpected token in argument list
>>
>> 2 .unreq
>> Clang doesn't recognize .unreq,  my code is as below:
>>
>> px .req r0
>> .unreq px
>> px .req r1
>>
>> clang give error: redefinition of 'px' does not match original.
>>
>> 3 .end
>> clang also doesn't recognize .end directive
>>
>> all my code is compiled by: clang -arch armv7 -v -integrated-as -g
>> -mcpu=cortex-a9 -mfpu=neon -isysroot
>> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk/
>>
>> my clang version is: Apple LLVM version 4.2 (clang-425.0.24) (based on
>> LLVM 3.2svn)
>>
>> BTW, could any tell me which files implement integrated-as in clang
>> source code, I think it may also help me by looking the source code(I've
>> tried 'grep', but with no success.)
>>
>> Great Thanks!
>>
>> ashi
>>
> ashi
>
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