Date: Thu, 11 Jul 2019 17:50:02 +0000 (UTC) From: adr <adr@SDF.ORG> To: Mark Millard <marklmi@yahoo.com> Cc: Robert Crowston via freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: FreeBSD arm EABI5 documentation? Message-ID: <alpine.NEB.2.21.1907111727500.16650@sdf.lonestar.org> In-Reply-To: <1CB61FE0-5665-424F-8B94-ABFC06906112@yahoo.com> References: <alpine.NEB.2.21.1907101508370.22895@sdf.lonestar.org> <f2967859f68f1d40f260661791126956f48f4d12.camel@freebsd.org> <alpine.NEB.2.21.1907101735020.3201@sdf.lonestar.org> <da6a8f7e596da9bf9015f76798a5575908ad1be4.camel@freebsd.org> <alpine.NEB.2.21.1907101904570.15468@sdf.lonestar.org> <1788e13e706b9fdaf610e4ddd671a5ed715f9dfe.camel@freebsd.org> <alpine.NEB.2.21.1907102043040.9461@sdf.lonestar.org> <AFF6488F-B2F5-486E-8F14-FAF852DB2C3C@yahoo.com> <1CB61FE0-5665-424F-8B94-ABFC06906112@yahoo.com>
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>>> Curious about 32-bit arm stack alignment requirements in netbsd
>>> (based on a FreeBSD thread making claims that user space allows
>>> 4-byte stack alignment), I went looking around some in NetBSD
Whooow... I don't know what on earth I'm missing, or what I said that
make you contact NetBSD developers talking about "claims".
Just write some ugly assembler:
======================================
.arch armv7-a
.syntax unified
.data
str1:
.string "1-6: %d, %d, %d, %d, %d, %d\n"
.align
.text
.global main
main:
push {r0} @ stack is not 8byte align anymore
mov r8, 10
loop:
ldr r0, =str1
mov r1, 1
mov r2, 2
mov r3, 3
mov r4, 4
mov r5, 5
mov r6, 6
push { r4-r6 } @ alignment will change in the loop
bl printf
subs r8, r8, 1
bne loop
end:
b end
=====================================================
as -a -o test.o test.s > test.l
cc -o test test.o
And it works. In fact it works in FreeBSD with clang.
But a more complex code, as a said before, calling
SDL2 to use graphics works without any problem on NetBSD
and Linux, but not on FreeBSD.
In fact I like that it doesn't work in FreeBSD, because
that made me correct my code.
That is all I was saying, and now I'm going to just shut the * up.
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