[fpc-devel] arm embedded on 2.6.0rc1

Geoffrey Barton mrb at periphon.net
Wed Dec 21 16:20:05 CET 2011

I have found a way out.

You need to add 'CROSSOPT=-Cpcortexm3' at the end of the line:-

make clean buildbase installbase CROSSINSTALL=1 OS_TARGET=embedded CPU_TARGET=arm SUBARCH=armv7m
in the wiki page.

Then the rtl builds in thumb2.

On 21 Dec 2011, at 10:55, Geoffrey Barton wrote:

> On 21 Dec 2011, at 10:43, fpc-devel-request at lists.freepascal.org wrote:
>> From: Jeppe Græsdal Johansen <jjohan07 at student.aau.dk>
>> Subject: Re: [fpc-devel] arm embedded on 2.6.0rc1
>> Date: 20 December 2011 21:20:07 GMT
>> To: FPC developers' list <fpc-devel at lists.freepascal.org>
>> Reply-To: FPC developers' list <fpc-devel at lists.freepascal.org>
>> Den 20-12-2011 21:51, Geoffrey Barton skrev:
>>> I have been trying to cross-compile arm embedded for a cortexm3 using 2.6.0rc1. I had this working previously with 2.4.0 and stellaris controllers.
>>> Following the instructions on the wiki page 'TARGET_Embedded' and adding suitable devices into cpuinfo etc. where they have been missed out, I can build a test program. However disassembling the resulting elf file shows the sections system_fpc_cpuuint, system_sysinitfpu, fpc_initializeunits, fpc_initializeunitsetc, system_internalexit, fpc_do_exit, system_system_exit and init$_system to be 32 bit arm code not thumb2. The rest of the program, including the stellaris.pp code, are correct thumb2 code.
>>> It appears the armv7m subarch is not being acted on when compiling rtl? I got the same result if I substituted cortexm3 for this too.
>>> Geoffrey
>>> _______________________________________________
>>> fpc-devel maillist  -  fpc-devel at lists.freepascal.org
>>> http://lists.freepascal.org/mailman/listinfo/fpc-devel
>> Do you have an example of how you can see it is 32 bit arm code and not thumb2?
> previously:-
> 00005cf4 <SYSTEM_FPC_CPUINIT>:
>     5cf4:	46ec      		mov	ip, sp
>     5cf6:	e92d 4800 	stmdb	sp!, {fp, lr}
>     5cfa:	46e3      		mov	fp, ip
>     5cfc:	b08a      		sub	sp, #40
>     5cfe:	f000 f803 	bl	5d08 <SYSTEM_SYSINITFPU>
>     5d02:	46dd      		mov	sp, fp
>     5d04:	e91d 8800 	ldmdb	sp, {fp, pc}
> now:-
> 00005d88 <SYSTEM_FPC_CPUINIT>:
>     5d88:	e92d4000 	push	{lr}
>     5d8c:	e24dd004 	sub	sp, sp, #4
>     5d90:	e59f0010 		ldr	r0, [pc, #16]	; 5da8 <SYSTEM_FPC_CPUINIT+0x20>
>     5d94:	e5d00000 	ldrb	r0, [r0]
>     5d98:	e3500000 	cmp	r0, #0
>     5d9c:	0b000002 	bleq	5dac <SYSTEM_SYSINITFPU>
>     5da0:	e28dd004 	add	sp, sp, #4
>     5da4:	e8bd8000 	pop	{pc}
>     5da8:	20000018 	andcs	r0, r0, r8, lsl r0

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