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Improve stack overflow recovery

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It's now possible to use sigaltstack() to recover from stack overflows
on Windows. Several bugs in sigaltstack() have been fixed, for all our
supported platforms. There's a newer better example showing how to use
this, along with three independent unit tests just to further showcase
the various techniques.
This commit is contained in:
Justine Tunney 2023-10-04 07:07:43 -07:00
parent 1694edf85c
commit 4631d34d0d
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GPG key ID: BE714B4575D6E328
24 changed files with 590 additions and 274 deletions
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3
libc/runtime/winmain.greg.c
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@ -169,6 +169,9 @@ static abi wontreturn void WinInit(const char16_t *cmdline) {
uint32_t old;
__imp_VirtualProtect((void *)stackaddr, stacksize, kNtPageReadwrite, &old);
}
uint32_t oldattr;
__imp_VirtualProtect((void *)stackaddr, GetGuardSize(),
kNtPageReadwrite | kNtPageGuard, &oldattr);
_mmi.p[0].x = stackaddr >> 16;
_mmi.p[0].y = (stackaddr >> 16) + ((stacksize - 1) >> 16);
_mmi.p[0].prot = prot;