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Always initialize thread local storage

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We had previously not enabled TLS in MODE=tiny in order to keep the
smallest example programs (e.g. life.com) just 16kb in size. But it
was error prone doing that, so now we just always enable it because
this change uses hacks to ensure it won't increase life.com's size.

This change also fixes a bug on NetBSD, where signal handlers would
break thread local storage if SA_SIGINFO was being used. This looks
like it might be a bug in NetBSD, but it's got a simple workaround.
This commit is contained in:
Justine Tunney 2022-07-18 22:26:11 -07:00
parent 057e8f5b54
commit 69f4152f38
33 changed files with 174 additions and 123 deletions
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12
libc/runtime/cosmo.S
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@ -76,22 +76,14 @@ cosmo: push %rbp
ret
.endfn cosmo,weak
#if !IsTiny()
// Enable TLS early if _Thread_local is used
// In MODE=tiny you may need to explicitly call __enable_tls()
// Otherwise this would bloat life.com from 16kb → 32kb D:
// Enables Thread Local Storage.
.init.start 304,_init_tls
mov $_tls_content,%eax
test %eax,%eax
jz 1f
push %rdi
push %rsi
call __enable_tls
pop %rsi
pop %rdi
jz 1f
1: .init.end 304,_init_tls
#endif
.init.end 304,_init_tls
#if !IsTiny()
// Creates deterministically addressed stack we can use