MFC r300415:

Add macro to convert errno and use it when appropriate.

MFC r295186

Align signal stack pointer to 16 bytes.

The stack must be aligned to 16 bytes at all times. Clang 3.8 is especially
adamant about this, and causes strange behavior and segmentation faults if it is
not the case.

PR: kern/206810

MFC r283479:

The kernel sends signals to the processes via ABI specific sv_sendsig method.
Native ABI do not need signal conversion, only emulators may want this. Usually
emulators implements its own sv_sendsig method. For now only ibcs2 emulator does
not have own sv_sendsig implementation and depends on native sendsig() method.
So, remove any extra attempts to convert signal numbers from native sendsig()
methods except from i386 where ibsc2 is living.

MFC r278001:
Do not qualify the mcontext_t *mcp argument for set_mcontext(9) as const.

MFC r261095,r263464,r263752,r264189

r263464,r263752,r275189:

Mask out SRR1 bits that aren't exported to the MSR.

This appears to fix a strange condition with X on 32-bit PowerBooks I
observed, caused by one of these bits getting set in the mcontext, but
not set in the thread, which is a symptom of another problem, more
difficult to diagnose. Since these bits aren't exported anyway, this
change makes it more explicit that the bits aren't MSR-related in SRR1.

r261095:

Fix 32-bit signal handling on ppc64. This was broken when the
PSL_USERSTATIC macro was changed. Since copying 64-bit srr1 into
32-bit srr1 drops the upper 32 bits, any bits set in the context were
dropped, meaning the context check fails. Since 32-bit set_context()
can't change those bits anyway, copy the ones from the current context
(td->td_frame) before calling set_context().

Approved by: re
Relnotes: yes (Affects 10-stable, but not 10.0-release)

MFC r258259, r258798, r259010

Unify handling of illegal instruction faults between AIM and Book-E.

Make uart_cpu_powerpc work on both FDT and OFW systems.

Fix debug printfs in FPU_EMU to compile on powerpc64 and enable it for
powerpc64.

MFC r258247, r258250, r258257

Remove a pointless #ifdef AIM. This is just PPC64 specific, including
64-bit Book-E.

Make single precision floating point arithmetic actually work

Split the function of the PCB_FPU flags into two: PCB_FPU now indicates that
the actual FPU is enabled, while PCB_FPREGS indicates that the FPU state
structure in the PCB is valid.

MFC r257115, r257116, r257117

Remove dead and duplicated code.

MFC r278001:
Do not qualify the mcontext_t *mcp argument for set_mcontext(9) as const.

MFC r261095,r263464,r263752,r264189

r263464,r263752,r275189:

Mask out SRR1 bits that aren't exported to the MSR.

This appears to fix a strange condition with X on 32-bit PowerBooks I
observed, caused by one of these bits getting set in the mcontext, but
not set in the thread, which is a symptom of another problem, more
difficult to diagnose. Since these bits aren't exported anyway, this
change makes it more explicit that the bits aren't MSR-related in SRR1.

r261095:

Fix 32-bit signal handling on ppc64. This was broken when the
PSL_USERSTATIC macro was changed. Since copying 64-bit srr1 into
32-bit srr1 drops the upper 32 bits, any bits set in the context were
dropped, meaning the context check fails. Since 32-bit set_context()
can't change those bits anyway, copy the ones from the current context
(td->td_frame) before calling set_context().

Approved by: re
Relnotes: yes (Affects 10-stable, but not 10.0-release)

MFC r258259, r258798, r259010

Unify handling of illegal instruction faults between AIM and Book-E.

Make uart_cpu_powerpc work on both FDT and OFW systems.

Fix debug printfs in FPU_EMU to compile on powerpc64 and enable it for
powerpc64.

MFC r258247, r258250, r258257

Remove a pointless #ifdef AIM. This is just PPC64 specific, including
64-bit Book-E.

Make single precision floating point arithmetic actually work

Split the function of the PCB_FPU flags into two: PCB_FPU now indicates that
the actual FPU is enabled, while PCB_FPREGS indicates that the FPU state
structure in the PCB is valid.

MFC r257115, r257116, r257117

Remove dead and duplicated code.