SROP mitigation. sendsig() stores a (per-process ^ &sigcontext) cookie
inside the sigcontext. sigreturn(2) checks syscall entry was from the
exact PC addr in the (per-process ASLR) sigtramp, verifi

SROP mitigation. sendsig() stores a (per-process ^ &sigcontext) cookie
inside the sigcontext. sigreturn(2) checks syscall entry was from the
exact PC addr in the (per-process ASLR) sigtramp, verifies the cookie,
and clears it to prevent sigcontext reuse.
not yet tested on landisk, sparc, *88k, socppc.
ok kettenis

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Determine whether we're currently on the alternative signal stack
dynamically, by comparing the stack pointer against the altstack
base and size, so that you get the correct answer if you longjmp
out

Determine whether we're currently on the alternative signal stack
dynamically, by comparing the stack pointer against the altstack
base and size, so that you get the correct answer if you longjmp
out of the signal handler, as tested by regress/sys/kern/stackjmp/.
Also, fix alt stack handling on vax, where it was completely broken.

Testing and corrections by miod@, krw@, tobiasu@, pirofti@

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Remove reg.h inclusion.

Missed by miod@ in his previous commit. Now groff should build.

Okay miod@.

Avoid horrible namespace pollution of <machine/signal.h> pulling in
<machine/reg.h> for the needs of struct sigcontext; said struct ought to
only use simple integer types.
Fixes build of groff on lan

Avoid horrible namespace pollution of <machine/signal.h> pulling in
<machine/reg.h> for the needs of struct sigcontext; said struct ought to
only use simple integer types.
Fixes build of groff on landisk.

ok pirofti@ (who had a similar diff)

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only pull reg.h in when __BSD_VISIBLE || __XPG_VISIBLE >= 420, as
on m88k, which is another architecture with structs visible inside
sigcontext. for pirofti
ok miod guenther

Move landisk to hardware floating point. At the moment the FPU context is
always saved upon context switches, as FPU registers are heavily used for
long long computations (don't ask). Gcc default to

Move landisk to hardware floating point. At the moment the FPU context is
always saved upon context switches, as FPU registers are heavily used for
long long computations (don't ask). Gcc default to -m4.

Credits to drahn@ otto@ and deraadt@ for feedback and help testing.

Upgrade procedure if you don't want to use the damn snapshots:
- build and install new kernel, reboot off it
- build new gcc, do not install it yet
- make includes
- install new gcc
- build and install lib/csu and lib/libc
- make build

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Preliminary bits for SuperH-based ports, based on NetBSD/sh3 codebase with
minor changes.