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Simplify TLS and reduce startup latency
This change simplifies the thread-local storage support code. On Windows and Mac OS X the startup latency of __enable_tls() has been reduced from 30ms to 1ms. On Windows, TLS memory accesses will now go much faster due to better self-modifying code that prevents a function call and acquires our thread information block pointer in a single instruction.
This commit is contained in:
Justine Tunney
parent
38c3fa63fe
commit
b1d9d11be1
15 changed files with 136 additions and 312 deletions
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@ -28,5 +28,5 @@
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*/
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privileged nocallersavedregisters errno_t *(__errno_location)(void) {
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if (!__tls_enabled) return &__errno;
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return (errno_t *)(__get_tls_inline() + 0x3c);
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return (errno_t *)(__get_tls_privileged() + 0x3c);
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}
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@ -1,33 +0,0 @@
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/nexgen32e/gettls.h"
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#include "libc/nexgen32e/threaded.h"
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/**
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* Returns address of thread information block.
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*
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* This function must not be called until TLS is initialized.
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*
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* @see __get_tls_inline()
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* @see __install_tls()
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* @see _spawn()
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*/
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optimizespeed char *__get_tls(void) {
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return __get_tls_inline();
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}
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@ -39,8 +39,6 @@ LIBC_SYSV_A_FILES := \
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libc/sysv/systemfive.S \
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libc/sysv/errno_location.greg.c \
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libc/sysv/errno.c \
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libc/sysv/gettls.greg.c \
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libc/sysv/tlspolyfill.S \
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libc/sysv/errfun.S \
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libc/sysv/strace.greg.c \
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libc/sysv/describeos.greg.c \
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@ -1,156 +0,0 @@
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.internal.h"
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// Code morphing TLS polyfills for The New Technology.
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//
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// @note msvc generates this code so it's stable
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// @note func ordering follows x86 reg encoding
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// @note each function is exactly 18 bytes
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// @see __enable_threads()
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__tls_mov_nt_rax:
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push %rcx
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mov __tls_index(%rip),%ecx
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mov %gs:0x1480(,%rcx,8),%rax
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pop %rcx
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ret
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.endfn __tls_mov_nt_rax,globl,hidden
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__tls_mov_nt_rcx:
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push %rax
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mov __tls_index(%rip),%eax
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mov %gs:0x1480(,%rax,8),%rcx
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pop %rax
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ret
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.endfn __tls_mov_nt_rcx
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__tls_mov_nt_rdx:
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push %rax
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mov __tls_index(%rip),%eax
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mov %gs:0x1480(,%rax,8),%rdx
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pop %rax
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ret
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.endfn __tls_mov_nt_rdx
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__tls_mov_nt_rbx:
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push %rax
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mov __tls_index(%rip),%eax
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mov %gs:0x1480(,%rax,8),%rbx
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pop %rax
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ret
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.endfn __tls_mov_nt_rbx
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__tls_mov_nt_rsp:
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push %rax
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mov __tls_index(%rip),%eax
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mov %gs:0x1480(,%rax,8),%rsp
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pop %rax
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ret
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.endfn __tls_mov_nt_rsp
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__tls_mov_nt_rbp:
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push %rax
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mov __tls_index(%rip),%eax
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mov %gs:0x1480(,%rax,8),%rbp
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pop %rax
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ret
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.endfn __tls_mov_nt_rbp
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__tls_mov_nt_rsi:
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push %rax
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mov __tls_index(%rip),%eax
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mov %gs:0x1480(,%rax,8),%rsi
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pop %rax
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ret
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.endfn __tls_mov_nt_rsi
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__tls_mov_nt_rdi:
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push %rax
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mov __tls_index(%rip),%eax
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mov %gs:0x1480(,%rax,8),%rdi
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pop %rax
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ret
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.endfn __tls_mov_nt_rdi
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////////////////////////////////////////////////////////////////////////////////
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__tls_add_nt_rax:
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push %rcx
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mov __tls_index(%rip),%ecx
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add %gs:0x1480(,%rcx,8),%rax
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pop %rcx
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ret
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.endfn __tls_add_nt_rax,globl,hidden
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__tls_add_nt_rcx:
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push %rax
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mov __tls_index(%rip),%eax
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add %gs:0x1480(,%rax,8),%rcx
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pop %rax
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ret
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.endfn __tls_add_nt_rcx
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__tls_add_nt_rdx:
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push %rax
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mov __tls_index(%rip),%eax
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add %gs:0x1480(,%rax,8),%rdx
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pop %rax
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ret
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.endfn __tls_add_nt_rdx
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__tls_add_nt_rbx:
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push %rax
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mov __tls_index(%rip),%eax
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add %gs:0x1480(,%rax,8),%rbx
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pop %rax
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ret
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.endfn __tls_add_nt_rbx
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__tls_add_nt_rsp:
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push %rax
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mov __tls_index(%rip),%eax
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add %gs:0x1480(,%rax,8),%rsp
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pop %rax
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ret
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.endfn __tls_add_nt_rsp
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__tls_add_nt_rbp:
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push %rax
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mov __tls_index(%rip),%eax
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add %gs:0x1480(,%rax,8),%rbp
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pop %rax
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ret
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.endfn __tls_add_nt_rbp
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__tls_add_nt_rsi:
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push %rax
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mov __tls_index(%rip),%eax
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add %gs:0x1480(,%rax,8),%rsi
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pop %rax
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ret
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.endfn __tls_add_nt_rsi
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__tls_add_nt_rdi:
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push %rax
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mov __tls_index(%rip),%eax
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add %gs:0x1480(,%rax,8),%rdi
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pop %rax
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ret
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.endfn __tls_add_nt_rdi
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