start adding back in tracing printfs. add support for the virtual page
table. Now it gets to user-land code, but fails because i've not
added support to the context switch code to activate and deactivate pmaps.
more naturally in terms of way the OSF/1 PALcode delivers traps and
interrupts. Clean up fault/exception handling code and system entry
points. Seperate ASTs into a seperate C function.
(2) Add unaligned access fixup code to fix unaligned quad, long,
and IEEE S and T floating datum loads and stores. VAX floating data
types not yet supported, and in the future will only be supported if
FIX_UNALIGNED_VAX_FP is defined. (No point in wasting the space when
most of the time there will never be VAX FP loads and stores.) Right
now, these features can be controlled only by sysctl. The (boolean)
integer sysctls machdep.unaligned_print, machdep.unaligned_fix, and
machdep.unaligned_sigbus control printing about unaligned accesses
(defaults on), fixing up of unaligned accesses (defaults on), and
forcing a SIGBUS on unaligned accesses (defaults off). If an access
is not fixed up (for lack of method or explicit decision), a SIGBUS is
always generated to keep programs from using bogus data. At some point,
these three choices should be controlled by per-process flags, as well.
more naturally in terms of way the OSF/1 PALcode delivers traps and
interrupts. Clean up fault/exception handling code and system entry
points. Seperate ASTs into a seperate C function.
(2) Add a boot flag ('H' and 'h') to make sure the kernel never
reboots after panic. Useful for debugging kernels which panic early
on after user processes have started, to fend off infinite reboot cycles.
Sort boot flag switch.
(3) Add unaligned access fixup code to fix unaligned quad, long,
and IEEE S and T floating datum loads and stores. VAX floating data
types not yet supported, and in the future will only be supported if
FIX_UNALIGNED_VAX_FP is defined. (No point in wasting the space when
most of the time there will never be VAX FP loads and stores.) Right
now, these features can be controlled only by sysctl. The (boolean)
integer sysctls machdep.unaligned_print, machdep.unaligned_fix, and
machdep.unaligned_sigbus control printing about unaligned accesses
(defaults on), fixing up of unaligned accesses (defaults on), and
forcing a SIGBUS on unaligned accesses (defaults off). If an access
is not fixed up (for lack of method or explicit decision), a SIGBUS is
always generated to keep programs from using bogus data. At some point,
these three choices should be controlled by per-process flags, as well.
more naturally in terms of way the OSF/1 PALcode delivers traps and
interrupts. Clean up fault/exception handling code and system entry
points. Seperate ASTs into a seperate C function.
(2) Clean up interrupt handling slightly.
(3) Add machinery to make [fs]uswintr be a bit more careful when
determining if a fault was actually their fault. (Unfortunately, they're
not actually implemented now, anyway.)
(4) Minor cleanup.
handling based on information in the 2nd Ed. of the Alpha Architecture
Reference Manual.
(2) Clean up interrupt handling slightly.
(3) Clean up badaddr().
more naturally in terms of way the OSF/1 PALcode delivers traps and
interrupts. Clean up fault/exception handling code and system entry
points. Seperate ASTs into a seperate C function.
(2) Add machinery to make [fs]uswintr be a bit more careful when
determining if a fault was actually their fault. (Unfortunately, they're
not actually implemented now, anyway.)
and IEEE S and T floating datum loads and stores. VAX floating data
types not yet supported, and in the future will only be supported if
FIX_UNALIGNED_VAX_FP is defined. (No point in wasting the space when
most of the time there will never be VAX FP loads and stores.) Right
now, these features can be controlled only by sysctl. The (boolean)
integer sysctls machdep.unaligned_print, machdep.unaligned_fix, and
machdep.unaligned_sigbus control printing about unaligned accesses
(defaults on), fixing up of unaligned accesses (defaults on), and
forcing a SIGBUS on unaligned accesses (defaults off). If an access
is not fixed up (for lack of method or explicit decision), a SIGBUS is
always generated to keep programs from using bogus data. At some point,
these three choices should be controlled by per-process flags, as well.
more naturally in terms of way the OSF/1 PALcode delivers traps and
interrupts. Clean up fault/exception handling code and system entry
points. Seperate ASTs into a seperate C function.
(2) Restructure and improve machine check and correctable error
handling based on information in the 2nd Ed. of the Alpha Architecture
Reference Manual.
(3) Removed unused (and not likely useful) PALcode assembly stubs.
more naturally in terms of way the OSF/1 PALcode delivers traps and
interrupts. Clean up fault/exception handling code and system entry
points. Seperate ASTs into a seperate C function.
unnecessary, and given that there's no reason to waste time and
add complexity in trap handlers. This means that code which sets and
uses the USP has to be a bit more careful, but that doesn't happen much.
containing a substruct (the hardware frame) and an array of registers,
treat it like one big array of registers, for easier and prettier
access. Update everything to deal with that.
Process Control Block
Interrupt/Exception/Syscall Stack Frame
Machine Check Error Summary Register
Machine Check Logout Area
clean up some, and add prototypes for all of the CPU instruction and
PALcode function stubs.
alpha_cpu.h, and this file is no longer necessary for the
Alpha. However, some machine-independent code (e.g.
/sys/compat/common/kern_exit_43.c) still wants a file with
this name to be around.
cgd