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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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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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Missed by miod@ in his previous commit. Now groff should build.
Okay miod@.
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<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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on m88k, which is another architecture with structs visible inside
sigcontext. for pirofti
ok miod guenther
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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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minor changes.
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deraadt
guenther
pirofti
miod