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Make _Thread_local work across platforms

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We now rewrite the binary image at runtime on Windows and XNU to change
mov %fs:0,%reg instructions to use %gs instead. There's also simpler
threading API introduced by this change and it's called _spawn() and
_join(), which has replaced most clone() usage.
This commit is contained in:
Justine Tunney 2022-07-10 04:01:17 -07:00
parent e4d6e263d4
commit 5f4f6b0e69
51 changed files with 808 additions and 1043 deletions
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7
libc/runtime/clone-linux.S
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@ -26,7 +26,7 @@
// @param rdx is ptid
// @param rcx is ctid
// @param r8 is tls
// @param r9 is func
// @param r9 is func(void*,int)→int
// @param 8(rsp) is arg
// @return tid of child on success, or -1 w/ errno
sys_clone_linux:
@ -48,8 +48,9 @@ sys_clone_linux:
jmp 0b
2: xor %ebp,%ebp # child thread
mov %rbx,%rdi # arg
call *%r9 # func(arg)
xchg %eax,%edi # func(arg) → exitcode
mov (%r10),%esi # tid
call *%r9 # func(arg,tid)
xchg %eax,%edi # func(arg,tid) → exitcode
mov $60,%eax # __NR_exit(exitcode)
syscall
.endfn sys_clone_linux,globl,hidden