Rich Felker
6ba5517a46
the TLS ABI spec for mips, powerpc, and some other (presently unsupported) RISC archs has the return value of __tls_get_addr offset by +0x8000 and the result of DTPOFF relocations offset by -0x8000. I had previously assumed this part of the ABI was actually just an implementation detail, since the adjustments cancel out. however, when the local dynamic model is used for accessing TLS that's known to be in the same DSO, either of the following may happen: 1. the -0x8000 offset may already be applied to the argument structure passed to __tls_get_addr at ld time, without any opportunity for runtime relocations. 2. __tls_get_addr may be used with a zero offset argument to obtain a base address for the module's TLS, to which the caller then applies immediate offsets for individual objects accessed using the local dynamic model. since the immediate offsets have the -0x8000 adjustment applied to them, the base address they use needs to include the +0x8000 offset. it would be possible, but more complex, to store the pointers in the dtv[] array with the +0x8000 offset pre-applied, to avoid the runtime cost of adding 0x8000 on each call to __tls_get_addr. this change could be made later if measurements show that it would help.
151 lines
3.6 KiB
C
151 lines
3.6 KiB
C
#ifndef _PTHREAD_IMPL_H
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#define _PTHREAD_IMPL_H
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#include <pthread.h>
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#include <signal.h>
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#include <errno.h>
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#include <limits.h>
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#include "libc.h"
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#include "syscall.h"
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#include "atomic.h"
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#include "futex.h"
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#define pthread __pthread
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struct pthread {
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struct pthread *self;
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void **dtv, *unused1, *unused2;
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uintptr_t sysinfo;
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uintptr_t canary, canary2;
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pid_t tid, pid;
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int tsd_used, errno_val;
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volatile int cancel, canceldisable, cancelasync;
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int detached;
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unsigned char *map_base;
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size_t map_size;
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void *stack;
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size_t stack_size;
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void *start_arg;
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void *(*start)(void *);
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void *result;
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struct __ptcb *cancelbuf;
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void **tsd;
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pthread_attr_t attr;
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volatile int dead;
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struct {
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volatile void *volatile head;
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long off;
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volatile void *volatile pending;
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} robust_list;
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int unblock_cancel;
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volatile int timer_id;
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locale_t locale;
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volatile int killlock[2];
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volatile int exitlock[2];
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volatile int startlock[2];
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unsigned long sigmask[_NSIG/8/sizeof(long)];
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char *dlerror_buf;
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int dlerror_flag;
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void *stdio_locks;
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uintptr_t canary_at_end;
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void **dtv_copy;
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};
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struct __timer {
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int timerid;
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pthread_t thread;
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};
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#define __SU (sizeof(size_t)/sizeof(int))
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#define _a_stacksize __u.__s[0]
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#define _a_guardsize __u.__s[1]
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#define _a_stackaddr __u.__s[2]
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#define _a_detach __u.__i[3*__SU+0]
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#define _a_sched __u.__i[3*__SU+1]
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#define _a_policy __u.__i[3*__SU+2]
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#define _a_prio __u.__i[3*__SU+3]
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#define _m_type __u.__i[0]
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#define _m_lock __u.__vi[1]
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#define _m_waiters __u.__vi[2]
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#define _m_prev __u.__p[3]
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#define _m_next __u.__p[4]
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#define _m_count __u.__i[5]
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#define _c_shared __u.__p[0]
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#define _c_seq __u.__vi[2]
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#define _c_waiters __u.__vi[3]
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#define _c_clock __u.__i[4]
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#define _c_lock __u.__vi[8]
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#define _c_head __u.__p[1]
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#define _c_tail __u.__p[5]
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#define _rw_lock __u.__vi[0]
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#define _rw_waiters __u.__vi[1]
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#define _rw_shared __u.__i[2]
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#define _b_lock __u.__vi[0]
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#define _b_waiters __u.__vi[1]
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#define _b_limit __u.__i[2]
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#define _b_count __u.__vi[3]
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#define _b_waiters2 __u.__vi[4]
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#define _b_inst __u.__p[3]
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#include "pthread_arch.h"
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#ifndef CANARY
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#define CANARY canary
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#endif
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#ifndef DTP_OFFSET
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#define DTP_OFFSET 0
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#endif
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#define SIGTIMER 32
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#define SIGCANCEL 33
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#define SIGSYNCCALL 34
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#define SIGALL_SET ((sigset_t *)(const unsigned long long [2]){ -1,-1 })
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#define SIGPT_SET \
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((sigset_t *)(const unsigned long [_NSIG/8/sizeof(long)]){ \
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[sizeof(long)==4] = 3UL<<(32*(sizeof(long)>4)) })
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#define SIGTIMER_SET \
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((sigset_t *)(const unsigned long [_NSIG/8/sizeof(long)]){ \
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0x80000000 })
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pthread_t __pthread_self_init(void);
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int __clone(int (*)(void *), void *, int, void *, ...);
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int __set_thread_area(void *);
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int __libc_sigaction(int, const struct sigaction *, struct sigaction *);
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int __libc_sigprocmask(int, const sigset_t *, sigset_t *);
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void __lock(volatile int *);
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void __unmapself(void *, size_t);
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void __vm_wait(void);
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void __vm_lock(void);
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void __vm_unlock(void);
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int __timedwait(volatile int *, int, clockid_t, const struct timespec *, int);
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int __timedwait_cp(volatile int *, int, clockid_t, const struct timespec *, int);
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void __wait(volatile int *, volatile int *, int, int);
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static inline void __wake(volatile void *addr, int cnt, int priv)
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{
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if (priv) priv = 128;
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if (cnt<0) cnt = INT_MAX;
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__syscall(SYS_futex, addr, FUTEX_WAKE|priv, cnt) != -ENOSYS ||
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__syscall(SYS_futex, addr, FUTEX_WAKE, cnt);
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}
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void __acquire_ptc(void);
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void __release_ptc(void);
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void __inhibit_ptc(void);
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void __block_all_sigs(void *);
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void __block_app_sigs(void *);
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void __restore_sigs(void *);
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#define DEFAULT_STACK_SIZE 81920
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#define DEFAULT_GUARD_SIZE PAGE_SIZE
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#define __ATTRP_C11_THREAD ((void*)(uintptr_t)-1)
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#endif
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