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From: Fredrik Noring <noring@nocrew.org>
To: "Philippe Mathieu-Daudé" <f4bug@amsat.org>
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>,
	Richard Henderson <richard.henderson@linaro.org>,
	Laurent Vivier <laurent@vivier.eu>,
	Aurelien Jarno <aurelien@aurel32.net>,
	qemu-devel@nongnu.org
Subject: Re: [PATCH 2/4] linux-user/mips64: Support o32 ABI syscalls
Date: Thu, 17 Dec 2020 18:20:45 +0100	[thread overview]
Message-ID: <X9uTbY//orPUA+oS@sx9> (raw)
In-Reply-To: <e1e6feeb-3bb3-d628-a87f-3696e9809d01@amsat.org>

On Thu, Dec 17, 2020 at 05:10:24PM +0100, Philippe Mathieu-Daudé wrote:
> On 12/17/20 11:40 AM, Laurent Vivier wrote:
> > Le 19/11/2020 à 17:17, Philippe Mathieu-Daudé a écrit :
> >> o32 ABI syscalls start at offset 4000.
> >>
> >> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> >> ---
> >>  linux-user/mips64/syscall_nr.h | 5 ++++-
> >>  1 file changed, 4 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/linux-user/mips64/syscall_nr.h b/linux-user/mips64/syscall_nr.h
> >> index 672f2fa51cb..6579421fa63 100644
> >> --- a/linux-user/mips64/syscall_nr.h
> >> +++ b/linux-user/mips64/syscall_nr.h
> >> @@ -1,4 +1,7 @@
> >> -#ifdef TARGET_ABI_MIPSN32
> >> +#if defined(TARGET_ABI_MIPSO32)
> >> +#define TARGET_SYSCALL_OFFSET 4000
> > 
> > The value of the offset is hardcoded in linux-user/mips/meson.build, so either you remove
> > TARGET_SYSCALL_OFFSET here or you update meson.build to use it.
> 
> I don't understand what this Meson rule does, as this
> doesn't work without this patch...
> 
> You can download PS2 64-bit O32 binaries from 2002 (before
> the official MIPS TLS ABI) there:
> https://sourceforge.net/projects/kernelloader/files/

These look rather like 128 bits, as there are R5900 MMIs. For instance,
one can find LQ, SQ, PEXTLB, PEXTLW and so on in /lib/ld.so in
ps2linux_live_v5_pal_netsurf_usb.7z.

There may be other surprises. R5900 Linux 2.x kernels are not IEEE 754
compatible, as opposed to both 5.x kernels and QEMU, for instance.

I would suggest compiling tests with a recent GCC.

Fredrik


  reply	other threads:[~2020-12-17 17:37 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-19 16:17 [PATCH 0/4] linux-user: Support o32 ABI with 64-bit MIPS CPUs Philippe Mathieu-Daudé
2020-11-19 16:17 ` [PATCH 1/4] linux-user/mips64: Restore setup_frame() for o32 ABI Philippe Mathieu-Daudé
2020-11-19 23:07   ` Richard Henderson
2020-12-17 10:18   ` Laurent Vivier
2021-02-11 21:33   ` Laurent Vivier
2020-11-19 16:17 ` [PATCH 2/4] linux-user/mips64: Support o32 ABI syscalls Philippe Mathieu-Daudé
2020-11-19 23:08   ` Richard Henderson
2020-11-19 23:09     ` Richard Henderson
2020-12-17 10:40   ` Laurent Vivier
2020-12-17 16:10     ` Philippe Mathieu-Daudé
2020-12-17 17:20       ` Fredrik Noring [this message]
2020-12-17 20:14       ` Laurent Vivier
2021-02-11 21:33   ` Laurent Vivier
2020-11-19 16:17 ` [PATCH 3/4] default-configs: Support o32 ABI with 64-bit MIPS CPUs Philippe Mathieu-Daudé
2020-11-19 16:45   ` Maciej W. Rozycki
2020-11-19 17:13     ` Philippe Mathieu-Daudé
2020-12-12  8:29       ` Fredrik Noring
2020-12-12 17:03     ` Fredrik Noring
2020-11-19 16:17 ` [PATCH 4/4] RFC qemu-binfmt-conf.sh: Add MIPS64 o32 ABI Philippe Mathieu-Daudé
2020-11-19 23:14   ` Richard Henderson
2020-11-19 16:27 ` [PATCH 0/4] linux-user: Support o32 ABI with 64-bit MIPS CPUs no-reply
2020-12-13 15:14 ` Philippe Mathieu-Daudé
2021-02-09 18:31   ` Philippe Mathieu-Daudé

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