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https://github.com/jart/cosmopolitan.git
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fad1279c61
If cosmo_dlopen() is linked on AMD64 then the runtime will switch to using %gs for thread-local storage. This eliminates the need for the imported symbol trampoline. It's now safer to pass function pointers back and forth with imported libraries. Your program gets recompiled at runtime to make it happen and the overhead is a few milliseconds.
89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
#ifndef COSMOPOLITAN_LIBC_THREAD_TLS_H_
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#define COSMOPOLITAN_LIBC_THREAD_TLS_H_
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#define TLS_ALIGNMENT 64
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#define TIB_FLAG_VFORKED 1
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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struct CosmoFtrace { /* 16 */
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char ft_once; /* 0 */
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char ft_noreentry; /* 1 */
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int ft_skew; /* 4 */
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int64_t ft_lastaddr; /* 8 */
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};
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/* NOTE: update aarch64 libc/errno.h if sizeof changes */
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/* NOTE: update aarch64 libc/proc/vfork.S if sizeof changes */
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/* NOTE: update aarch64 libc/nexgen32e/gc.S if sizeof changes */
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struct CosmoTib {
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struct CosmoTib *tib_self; /* 0x00 */
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struct CosmoFtrace tib_ftracer; /* 0x08 */
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void *tib_garbages; /* 0x18 */
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intptr_t tib_locale; /* 0x20 */
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intptr_t tib_pthread; /* 0x28 */
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struct CosmoTib *tib_self2; /* 0x30 */
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_Atomic(int32_t) tib_tid; /* 0x38 transitions -1 → tid → 0 */
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int32_t tib_errno; /* 0x3c */
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uint64_t tib_flags; /* 0x40 */
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int tib_ftrace; /* inherited */
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int tib_strace; /* inherited */
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_Atomic(uint64_t) tib_sigmask; /* inherited */
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_Atomic(uint64_t) tib_sigpending;
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_Atomic(uint64_t) tib_syshand; /* win32=kThread, xnusilicon=pthread_t */
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char *tib_sigstack_addr;
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uint32_t tib_sigstack_size;
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uint32_t tib_sigstack_flags;
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void **tib_keys;
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void *tib_nsync;
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void *tib_todo[7];
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};
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extern int __threaded;
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extern char __tls_morphed;
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extern unsigned __tls_index;
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char *_mktls(struct CosmoTib **);
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void __bootstrap_tls(struct CosmoTib *, char *);
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#ifdef __x86_64__
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extern char __tls_enabled;
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#define __tls_enabled_set(x) __tls_enabled = x
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#elif defined(__aarch64__)
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#define __tls_enabled true
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#define __tls_enabled_set(x) (void)0
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#else
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#error "unsupported architecture"
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#endif
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void __set_tls(struct CosmoTib *);
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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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__funline pureconst struct CosmoTib *__get_tls(void) {
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#ifdef __chibicc__
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return 0;
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#elif __x86_64__
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struct CosmoTib *__tib;
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__asm__("mov\t%%fs:0,%0" : "=r"(__tib));
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return __tib;
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#elif defined(__aarch64__)
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register struct CosmoTib *__tls __asm__("x28");
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return __tls - 1;
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#endif
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}
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#ifdef __x86_64__
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#define __adj_tls(tib) (tib)
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#elif defined(__aarch64__)
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#define __adj_tls(tib) ((struct CosmoTib *)(tib) + 1)
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#endif
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_THREAD_TLS_H_ */
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