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Make spinlocks faster (take two)

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This change is green on x86 and arm test fleet.
This commit is contained in:
Justine Tunney 2024-07-26 00:44:45 -07:00
parent 02e1cbcd00
commit 59692b0882
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GPG key ID: BE714B4575D6E328
14 changed files with 122 additions and 79 deletions
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2
libc/intrin/iscall.c
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@ -20,7 +20,7 @@
// returns true if `p` is preceded by x86 call instruction
// this is actually impossible to do but we'll do our best
dontinstrument int __is_call(const unsigned char *p) {
privileged dontinstrument int __is_call(const unsigned char *p) {
if (p[-5] == 0xe8)
return 5; // call Jvds
if (p[-2] == 0xff && (p[-1] & 070) == 020)