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62ca1b0902
* Fix deterministic startup stack setup, especially for bare metal * Implement __enable_tls() on bare metal * Get __get_tls_privileged() working on bare metal
44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_GETTLS_H_
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#define COSMOPOLITAN_LIBC_NEXGEN32E_GETTLS_H_
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#include "libc/dce.h"
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#include "libc/nexgen32e/threaded.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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#if defined(__GNUC__) && defined(__x86_64__) && !defined(__STRICT_ANSI__)
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/**
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* Returns location of thread information block.
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*
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* This can't be used in privileged functions.
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*/
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static noasan inline char *__get_tls(void) {
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char *tib;
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asm("mov\t%%fs:0,%0" : "=r"(tib) : /* no inputs */ : "memory");
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return tib;
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}
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#endif /* GNU x86-64 */
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#if defined(__GNUC__) && defined(__x86_64__) && !defined(__STRICT_ANSI__)
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/**
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* Returns location of thread information block.
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*
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* This should be favored over __get_tls() for .privileged code that
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* can't be self-modified by __enable_tls().
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*/
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static noasan inline char *__get_tls_privileged(void) {
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char *tib, *lin = (char *)0x30;
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if (IsLinux() || IsFreebsd() || IsNetbsd() || IsOpenbsd() || IsMetal()) {
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asm("mov\t%%fs:(%1),%0" : "=a"(tib) : "r"(lin) : "memory");
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} else {
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asm("mov\t%%gs:(%1),%0" : "=a"(tib) : "r"(lin) : "memory");
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if (IsWindows()) {
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tib = *(char **)(tib + 0x1480 + __tls_index * 8);
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}
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}
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return tib;
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}
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#endif /* GNU x86-64 */
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_GETTLS_H_ */
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