[fpc-devel] arm embedded on 2.6.0rc1

[Geoffrey Barton]

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
>> 
>> 
>> _______________________________________________
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> 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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