Date: Wed, 8 May 2019 15:10:45 -0700 From: Mark Millard <marklmi@yahoo.com> To: Justin Hibbits <chmeeedalf@gmail.com>, FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: powerpc64 context: aim/locore64.S __start TMPSTKSZ-48 vs. TMPSTKSZ-96 (-r277392 and later) vs. modern aim/trap_subr64.S cpu_reset_handler: (TMPSTKSZ-48)? Message-ID: <AFE5723D-667F-4292-8331-02ED086C67FC@yahoo.com> In-Reply-To: <FC2362ED-8042-441C-A897-CBDD2601DAD1@yahoo.com> References: <FC2362ED-8042-441C-A897-CBDD2601DAD1@yahoo.com>
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On 2019-May-8, at 13:53, Mark Millard <marklmi at yahoo.com> wrote:
> Should cpu_reset_handler have been updated to use (TMPSTKSZ-96) when
> __start was changed to use TMPSTKSZ-96, back in 2015-Jan-19?
>=20
Looks like I should have listed more context: there is both
(TMPSTKSZ-48) and (TRAPSTKSZ-48) for powerpc64:
/mnt/usr/src/sys/powerpc/aim/trap_subr32.S: addi =
%r1,%r1,TRAPSTKSZ-16
/mnt/usr/src/sys/powerpc/aim/trap_subr64.S: addi =
%r1,%r1,(TMPSTKSZ-48)
/mnt/usr/src/sys/powerpc/aim/trap_subr64.S: addi =
%r1,%r1,(TRAPSTKSZ-48)
/mnt/usr/src/sys/powerpc/aim/locore32.S:#define TMPSTKSZ 8192 =
/* 8K temporary stack */
/mnt/usr/src/sys/powerpc/aim/locore32.S: .space TMPSTKSZ
/mnt/usr/src/sys/powerpc/aim/locore32.S:#define TRAPSTKSZ 4096 =
/* 4k trap stack */
/mnt/usr/src/sys/powerpc/aim/locore32.S: .space TRAPSTKSZ
/mnt/usr/src/sys/powerpc/aim/locore32.S: addi =
%r1,%r1,(8+TMPSTKSZ-40)
/mnt/usr/src/sys/powerpc/aim/locore64.S:#define TMPSTKSZ 16384 =
/* 16K temporary stack */
/mnt/usr/src/sys/powerpc/aim/locore64.S: .space TMPSTKSZ
/mnt/usr/src/sys/powerpc/aim/locore64.S:#define TRAPSTKSZ 4096 =
/* 4k trap stack */
/mnt/usr/src/sys/powerpc/aim/locore64.S: .space TRAPSTKSZ
/mnt/usr/src/sys/powerpc/aim/locore64.S: .llong tmpstk + =
TMPSTKSZ - 96 - .
/mnt/usr/src/sys/powerpc/ofw/ofwcall64.S:#define OFWSTKSZ =
4096 /* 4K Open Firmware stack */
/mnt/usr/src/sys/powerpc/ofw/ofwcall64.S: .space OFWSTKSZ
/mnt/usr/src/sys/powerpc/ofw/ofwcall64.S: addi =
%r7,%r7,OFWSTKSZ-40
/mnt/usr/src/sys/powerpc/ofw/ofwcall32.S:#define OFWSTKSZ =
4096 /* 4K Open Firmware stack */
/mnt/usr/src/sys/powerpc/ofw/ofwcall32.S: .space OFWSTKSZ
/mnt/usr/src/sys/powerpc/ofw/ofwcall32.S: addi =
%r1,%r1,(OFWSTKSZ-32)
It is not obvious what justifies the figures for
powerpc64:
TMPSTKSZ - 96
TMPSTKSZ-48
TRAPSTKSZ-48
Magic constants with no notes about how to figure out
the correct (minimum?) figure to subtract.
My question about the 48 vs. 96 may apply to more
than the TMPSTKSZ-48 usage.
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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