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cmd/dist: support for NetBSD/ARM

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1. when executing a unsupported VFP instruction, the NetBSD kernel somehow
doesn't report SIGILL, and instead just spin and spin, we add a alarm(2)
to detect this case (albeit this is a kernel bug).
2. NetBSD/ARM's VFP11 support is not complete, so temporarily disable it.
3. The default gcc shipped with NetBSD-current mis-optimizes our code
at -O2, so lower the optimization level to -O1 on NetBSD/ARM.

R=dave, rsc
CC=golang-dev
https://golang.org/cl/7286044
This commit is contained in:
Shenghou Ma 2013-03-03 06:50:17 +08:00
parent a17b7b9491
commit 3d50aaf483
3 changed files with 25 additions and 0 deletions
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7
src/cmd/dist/unix.c vendored
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@ -745,17 +745,24 @@ static void sigillhand(int);
// xtryexecfunc tries to execute function f, if any illegal instruction
// signal received in the course of executing that function, it will
// return 0, otherwise it will return 1.
// Some systems (notably NetBSD) will spin and spin when executing VFPv3
// instructions on VFPv2 system (e.g. Raspberry Pi) without ever triggering
// SIGILL, so we set a 1-second alarm to catch that case.
int
xtryexecfunc(void (*f)(void))
{
int r;
r = 0;
signal(SIGILL, sigillhand);
signal(SIGALRM, sigillhand);
alarm(1);
if(sigsetjmp(sigill_jmpbuf, 1) == 0) {
f();
r = 1;
}
signal(SIGILL, SIG_DFL);
alarm(0);
signal(SIGALRM, SIG_DFL);
return r;
}