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Clean up the clone() code a bit

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This commit is contained in:
Justine Tunney 2022-05-17 07:40:00 -07:00
parent ce71677156
commit 2743f3d012
20 changed files with 252 additions and 150 deletions
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38
libc/nexgen32e/checkstackalign.S Normal file
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@ -0,0 +1,38 @@
/*-*- 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"
// Checks that stack is 16-byte aligned.
//
// This function crashes if called with a misaligned stack.
_checkstackalign:
push %rbp
mov %rsp,%rbp
/ allocate sixteen bytes
push %rax
push %rax
/ put a value in it
xorps %xmm0,%xmm0
movaps %xmm0,-16(%rbp)
leave
ret
.endfn _checkstackalign,globl

1
libc/nexgen32e/nexgen32e.h
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@ -7,6 +7,7 @@ extern long kHalfCache3;
void imapxlatab(void *);
void insertionsort(int32_t *, size_t);
void _checkstackalign(void);
int64_t div10int64(int64_t) libcesque pureconst;
int64_t div100int64(int64_t) libcesque pureconst;

2
libc/nexgen32e/threaded.c
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@ -16,7 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/threaded.h"
#include "libc/nexgen32e/threaded.h"
bool __threaded;
bool __tls_enabled;

39
libc/nexgen32e/threaded.h Normal file
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@ -0,0 +1,39 @@
#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_THREADED_H_
#define COSMOPOLITAN_LIBC_NEXGEN32E_THREADED_H_
#include "libc/dce.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
extern bool __threaded;
extern bool __tls_enabled;
extern unsigned __tls_index;
void *__initialize_tls(char[hasatleast 64]);
void __install_tls(char[hasatleast 64]);
#if defined(__GNUC__) && defined(__x86_64__)
/**
* Returns address of thread information block.
*
* This function must not be called until TLS is initialized.
*
* @see __install_tls()
* @see clone()
*/
static noasan inline char *__get_tls(void) {
char *tib, *lin = (char *)0x30;
if (IsLinux() || IsFreebsd() || IsNetbsd() || IsOpenbsd()) {
asm("mov\t%%fs:(%1),%0" : "=a"(tib) : "r"(lin));
} else {
asm("mov\t%%gs:(%1),%0" : "=a"(tib) : "r"(lin));
if (IsWindows()) {
tib = *(char **)(tib + 0x1480 + __tls_index * 8);
}
}
return tib;
}
#endif /* GNU x86-64 */
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_THREADED_H_ */