Make _Thread_local work across platforms

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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@ -17,6 +17,7 @@
PERFORMANCE OF THIS SOFTWARE.
*/
#include "libc/nexgen32e/gettls.h"
#include "libc/nexgen32e/threaded.h"
/**
* Returns address of thread information block.

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@ -40,6 +40,7 @@ LIBC_SYSV_A_FILES := \
libc/sysv/errno_location.greg.c \
libc/sysv/errno.c \
libc/sysv/gettls.greg.c \
libc/sysv/tlspolyfill.S \
libc/sysv/errfun.S \
libc/sysv/strace.greg.c \
libc/sysv/describeos.greg.c \

90
libc/sysv/tlspolyfill.S Normal file
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@ -0,0 +1,90 @@
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi
Copyright 2022 Justine Alexandra Roberts Tunney
Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted, provided that the
above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
*/
#include "libc/macros.internal.h"
// Code morphing TLS polyfills for The New Technology.
//
// @note msvc generates this code so it's stable
// @note func ordering follows x86 reg encoding
// @note each function is exactly 18 bytes
// @see __enable_threads()
__get_tls_nt_rax:
push %rcx
mov __tls_index(%rip),%ecx
mov %gs:0x1480(,%rcx,8),%rax
pop %rcx
ret
.endfn __get_tls_nt_rax,globl,hidden
__get_tls_nt_rcx:
push %rax
mov __tls_index(%rip),%eax
mov %gs:0x1480(,%rax,8),%rcx
pop %rax
ret
.endfn __get_tls_nt_rcx
__get_tls_nt_rdx:
push %rax
mov __tls_index(%rip),%eax
mov %gs:0x1480(,%rax,8),%rdx
pop %rax
ret
.endfn __get_tls_nt_rdx
__get_tls_nt_rbx:
push %rax
mov __tls_index(%rip),%eax
mov %gs:0x1480(,%rax,8),%rbx
pop %rax
ret
.endfn __get_tls_nt_rbx
__get_tls_nt_rsp:
push %rax
mov __tls_index(%rip),%eax
mov %gs:0x1480(,%rax,8),%rsp
pop %rax
ret
.endfn __get_tls_nt_rsp
__get_tls_nt_rbp:
push %rax
mov __tls_index(%rip),%eax
mov %gs:0x1480(,%rax,8),%rbp
pop %rax
ret
.endfn __get_tls_nt_rbp
__get_tls_nt_rsi:
push %rax
mov __tls_index(%rip),%eax
mov %gs:0x1480(,%rax,8),%rsi
pop %rax
ret
.endfn __get_tls_nt_rsi
__get_tls_nt_rdi:
push %rax
mov __tls_index(%rip),%eax
mov %gs:0x1480(,%rax,8),%rdi
pop %rax
ret
.endfn __get_tls_nt_rdi