flat assembler - FASMARM v1.43 - Cross assembler for ARM CPUs

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igneele

Joined: 26 Dec 2015
Posts: 1

igneele

Hi, i have some strange in this code:

Code:

thumb

struc GPIO_RegMap
{
  .OTYPER dw ?
}

virtual at r1
  gpiob GPIO_RegMap
end virtual
ldr r0, [gpiob.CRL]
str r0, [gpiob.CRL]

If field CRL is missing in gpiob, compiler says "Error: (R15) not valid as second parameter" on str instruction, but if delete "thumb" - compiler says "Error: undefined symbol gpiob.CRL" on ldr instruction as it should... why str, r15, thumb?

16 Mar 2020, 18:07

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17933
Location: In your JS exploiting you and your system

revolution

It's a bug. Thanks for reporting.

There are some other bugs and updates that fasmarm is due for. They ill be fixed soon hopefully.

17 Mar 2020, 01:33

MazeGen

Joined: 06 Oct 2003
Posts: 977
Location: Czechoslovakia

MazeGen

Are there any instructions how to build FASMARM? I can tell how to combine FASMARM sources with FASM thanks to ProMiNick's fasmpack, however, what about the compatibility? Is v1.43 compatible with the latest FASM version? I read the ReadMe but didn't find this information.

EDIT: just found this post from 2017:

revolution wrote:

revolution wrote:
Note that this version assembles against fasm v1.73.01
I have update the download package with the bug fix from fasm v1.73.02
WHATSNEW.TXT wrote:
Fixed a bug in the storage of "virtual as" blocks.

It would be nice to see this info in ReadMe.

13 May 2020, 07:28

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17933
Location: In your JS exploiting you and your system

revolution

Because of the way the patching works, you need the matching version of fasm.

The most recent build uses 1.72.02
https://board.flatassembler.net/topic.php?p=201689#201689

From there just copy the files from fasmarm into the same folders as fasm. All the files are separate so it doesn't overwrite any files. Then change into the fasmarm folder and use fasm to compile fasmarm/fasmwarm.

13 May 2020, 07:34

TmEE

Joined: 19 Jun 2019
Posts: 4
Location: Estonia

TmEE

I'm finally starting to get back into ARM development again and I see there's been no fixes since last time I was here.

I took a look at the source code and I couldn't really see where I should dig into to fix the problem I originally described. Where should I look to make an attempt to fix it myself ?

04 Feb 2021, 12:11

zhak

Joined: 12 Apr 2005
Posts: 492
Location: Belarus

zhak

flat assembler for ARM version 1.43 (built on fasm 1.73.02)

There seems to be something wrong with ADRP instruction.

Code:

        processor cpu64_v8
        code64

        mrs x9, mpidr_el1
        tst x9, 11b
        b.eq __init
        wfe
        b.al $ - 4

__init:

        adr x9, $$
        mov sp, x9

        adrp x9, bss
        add x9, x9, bss and 0xfff
        mov x8, bss_size / 16
        stp xzr, xzr, [x9], 16
        subs x8, x8, 1
        b.gt $ - 8
        b.al $

        align 16

bss:
        align 16
bss_size = $ - bss

fails with error:

Code:

        adrp x9, bss
processed: adrp x9,bss
error: Address is not aligned.

However, changing "ADRP x9, bss" to "dw 0x90000009"
compiles and correctly disassembles into ADRP x9, 0x0

16 Feb 2021, 22:02

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17933
Location: In your JS exploiting you and your system

revolution

Thank you for the report. I will add it to the list of things to fix when I am back to my desk.

The problem appears to be with adrp trying to use labels defined later in the source.

Also: Note that your bss_size is zero.

17 Feb 2021, 02:26

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17933
Location: In your JS exploiting you and your system

revolution

You can apply a temporary fix around line 24774 in armv8.asm:

Code:

;...
ARM64_adr:
        ;used by ADR, ADRP
        call    decode_template
    TEMPLATE \
        <TMPL_dword_z_reg,TMPL_address64>       ;0=xd,imm
        test    [cpu_capability_flags2],1 shl CPU64_CAPABILITY_V8 shr 32
        jz      ERROR_requires_cpu64_capability_v8
        mov     ebp,[arm64_instruction]
        mov     eax,[immediate_value]
        mov     edx,[immediate_value_high]
        mov     ecx,[addressing_space]
        add     eax,[ecx+0]
        adc     edx,[ecx+4]
        sub     eax,edi
        sbb     edx,0
        test    ebp,ebp                         ;ADRP?
        jns     .offset_okay
        test    eax,0xfff
        mov     ecx,ERROR_branch_misaligned
;       jnz     ARM_store_instruction_with_error ; <--- comment out this line
        shrd    eax,edx,12
        sar     edx,12
    .offset_okay:
;...

17 Feb 2021, 08:03

zhak

Joined: 12 Apr 2005
Posts: 492
Location: Belarus

zhak

Thanks for the workaround, revolution. Source doesn't compile with the latest fasm, but I found 1.73.04 build somewhere on the internet and it worked fine.

17 Feb 2021, 11:09

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17933
Location: In your JS exploiting you and your system

revolution

I see that the download page has only version 1.73.05 and up now.

http://flatassembler.net/fasmw17305.zip
http://flatassembler.net/fasm-1.73.05.tgz
http://flatassembler.net/fasm17305.zip
http://flatassembler.net/fasm-1.73.05.tar.gz

I don't know if that version will work though.

18 Feb 2021, 03:53

ProMiNick

Joined: 24 Mar 2012
Posts: 618
Location: Russian Federation, Sochi

ProMiNick

revolution, somewhere on the internet - I guess it is some of mines (fasmpack, at home I get fasmwarm 1.43 build on 1.73.27, (in net on 1.73.25 - core has no significant changes for ARM from 1.73.27)) adaptations (last patch thou introduced wasn`t there).
Thou still can`t return to home?

18 Feb 2021, 05:54

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 7861
Location: Kraków, Poland

Tomasz Grysztar

revolution wrote:

I see that the download page has only version 1.73.05 and up now.

It is possible to get the sources of older versions from the GitHub repository.

18 Feb 2021, 10:02

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