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Make supervisor stack inaccessible to user mode
Jeffrey Lee authored 
Previously the supervisor stack was read-only in user mode, but since
the supervisor stack is typically empty when the CPU is in user mode,
it's questionable whether any software actually makes use of this
facility.

To simplify support for the long descriptor page table format (which
doesn't support the user-RO + privileged-RW access mode), let's
try and remove usermode SVC stack access completely.

Tested on Raspberry Pi 4

Version 6.48. Tagged as 'Kernel-6_48'
bbc7ad20
Name Last commit Last update
Dev Fix OS_Memory 7 for discontiguous RAM
Docs Support temporary mapping of IO above 4GB using supersections
Resources/UK Add aligned RMA claim subreason
TestSrc Delete pre-HAL and 26bit code
h Header defs for Pi Compute module and IIC
hdr Move ROM constant and add ASSERT
s Make supervisor stack inaccessible to user mode
.gitattributes Added 'UnConv' error (see also HdrSrc).
.gitignore Fix cleaning
BlackLog Initial revision
Changes Import from cleaned 360 CD
HelpStrs Adoption of *CONFIGURE/STATUS CACHE commands
LICENSE Clean reimport of hdr.RISCOS (real commit date 2008-03-28 by bavison), without any of the 3rd party allocations.
Makefile Mirror OS_AMBControl changes from Pyromaniac
MkClean,fd7 Mostly device stuff.
MkExport,fd7 Import from cleaned 360 CD
MkInstall,fd7 Added a disc install phase as an analogue of the export phase
MkRom,fd7 Makefile recreated from fragments
Version Back to odd numbered development
VersionASM Make supervisor stack inaccessible to user mode
VersionNum Make supervisor stack inaccessible to user mode