diff options
Diffstat (limited to 'libpthread/linuxthreads.old/sysdeps/i386')
| -rw-r--r-- | libpthread/linuxthreads.old/sysdeps/i386/pt-machine.h | 146 | ||||
| -rw-r--r-- | libpthread/linuxthreads.old/sysdeps/i386/tls.h | 184 | ||||
| -rw-r--r-- | libpthread/linuxthreads.old/sysdeps/i386/useldt.h | 306 |
3 files changed, 636 insertions, 0 deletions
diff --git a/libpthread/linuxthreads.old/sysdeps/i386/pt-machine.h b/libpthread/linuxthreads.old/sysdeps/i386/pt-machine.h new file mode 100644 index 000000000..24c5e6c7c --- /dev/null +++ b/libpthread/linuxthreads.old/sysdeps/i386/pt-machine.h @@ -0,0 +1,146 @@ +/* Machine-dependent pthreads configuration and inline functions. + i386 version. + Copyright (C) 1996-2001, 2002, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Richard Henderson <rth@tamu.edu>. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; see the file COPYING.LIB. If + not, see <http://www.gnu.org/licenses/>. */ + +#ifndef _PT_MACHINE_H +#define _PT_MACHINE_H 1 + +#include <features.h> + +#ifndef __ASSEMBLER__ +#ifndef PT_EI +# define PT_EI __extern_always_inline __attribute__((visibility("hidden"))) +#endif + +extern long int testandset (int *spinlock); +extern int __compare_and_swap (long int *p, long int oldval, long int newval); + +/* Get some notion of the current stack. Need not be exactly the top + of the stack, just something somewhere in the current frame. */ +#define CURRENT_STACK_FRAME __builtin_frame_address (0) + + +/* See if we can optimize for newer cpus... */ +#if defined __GNUC__ && __GNUC__ >= 2 && \ + (defined __i486__ || defined __pentium__ || defined __pentiumpro__ || defined __pentium4__ || \ + defined __athlon__ || defined __k8__) + +/* Spinlock implementation; required. */ +PT_EI long int +testandset (int *spinlock) +{ + long int ret; + + __asm__ __volatile__ ( + "xchgl %0, %1" + : "=r" (ret), "=m" (*spinlock) + : "0" (1), "m" (*spinlock) + : "memory"); + + return ret; +} + +/* Compare-and-swap for semaphores. It's always available on i686. */ +#define HAS_COMPARE_AND_SWAP + +PT_EI int +__compare_and_swap (long int *p, long int oldval, long int newval) +{ + char ret; + long int readval; + + __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0" + : "=q" (ret), "=m" (*p), "=a" (readval) + : "r" (newval), "m" (*p), "a" (oldval) + : "memory"); + return ret; +} + +#if defined(__ASSUME_LDT_WORKS) && __ASSUME_LDT_WORKS > 0 +#include "useldt.h" +#endif + +/* The P4 and above really want some help to prevent overheating. */ +#define BUSY_WAIT_NOP __asm__ ("rep; nop") + + +#else /* Generic i386 implementation */ + +extern int compare_and_swap_is_available (void); + +/* Spinlock implementation; required. */ +PT_EI long int +testandset (int *spinlock) +{ + long int ret; + + __asm__ __volatile__( + "xchgl %0, %1" + : "=r"(ret), "=m"(*spinlock) + : "0"(1), "m"(*spinlock) + : "memory"); + + return ret; +} + + +/* Compare-and-swap for semaphores. + Available on the 486 and above, but not on the 386. + We test dynamically whether it's available or not. */ + +#define HAS_COMPARE_AND_SWAP +#define TEST_FOR_COMPARE_AND_SWAP + +PT_EI int +__compare_and_swap (long int *p, long int oldval, long int newval) +{ + char ret; + long int readval; + + __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0" + : "=q" (ret), "=m" (*p), "=a" (readval) + : "r" (newval), "m" (*p), "a" (oldval) + : "memory"); + return ret; +} + +PT_EI int +compare_and_swap_is_available (void) +{ + int changed; + int oldflags; + /* get EFLAGS */ + __asm__ __volatile__ ("pushfl; popl %0" : "=r" (oldflags) : ); + /* Flip AC bit in EFLAGS. */ + __asm__ __volatile__ ("pushl %0; popfl" : : "r" (oldflags ^ 0x40000) : "cc"); + /* reread EFLAGS */ + __asm__ __volatile__ ("pushfl; popl %0" : "=r" (changed) : ); + /* See if bit changed. */ + changed = (changed ^ oldflags) & 0x40000; + /* Restore EFLAGS. */ + __asm__ __volatile__ ("pushl %0; popfl" : : "r" (oldflags) : "cc"); + /* If the AC flag did not change, it's a 386 and it lacks cmpxchg. + Otherwise, it's a 486 or above and it has cmpxchg. */ + return changed != 0; +} +#endif /* Generic i386 implementation */ + +#endif /* __ASSEMBLER__ */ + +#endif /* pt-machine.h */ diff --git a/libpthread/linuxthreads.old/sysdeps/i386/tls.h b/libpthread/linuxthreads.old/sysdeps/i386/tls.h new file mode 100644 index 000000000..4469f0776 --- /dev/null +++ b/libpthread/linuxthreads.old/sysdeps/i386/tls.h @@ -0,0 +1,184 @@ +/* Definition for thread-local data handling. linuxthreads/i386 version. + Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _TLS_H +#define _TLS_H + +# include <pt-machine.h> + +#ifndef __ASSEMBLER__ +# include <stdbool.h> +# include <stddef.h> +# include <stdint.h> + +/* Type for the dtv. */ +typedef union dtv +{ + size_t counter; + void *pointer; +} dtv_t; + + +typedef struct +{ + void *tcb; /* Pointer to the TCB. Not necessary the + thread descriptor used by libpthread. */ + dtv_t *dtv; + void *self; /* Pointer to the thread descriptor. */ +} tcbhead_t; +#endif + + +/* We can support TLS only if the floating-stack support is available. */ +#if defined FLOATING_STACKS && defined HAVE_TLS_SUPPORT + +/* Signal that TLS support is available. */ +//# define USE_TLS 1 + +# ifndef __ASSEMBLER__ +/* Get system call information. */ +# include <sysdep.h> + + +/* Get the thread descriptor definition. */ +# include <linuxthreads/descr.h> + +/* This is the size of the initial TCB. */ +# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) + +/* Alignment requirements for the initial TCB. */ +# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t) + +/* This is the size of the TCB. */ +# define TLS_TCB_SIZE sizeof (struct _pthread_descr_struct) + +/* Alignment requirements for the TCB. */ +# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct) + +/* The TCB can have any size and the memory following the address the + thread pointer points to is unspecified. Allocate the TCB there. */ +# define TLS_TCB_AT_TP 1 + + +/* Install the dtv pointer. The pointer passed is to the element with + index -1 which contain the length. */ +# define INSTALL_DTV(descr, dtvp) \ + ((tcbhead_t *) (descr))->dtv = (dtvp) + 1 + +/* Install new dtv for current thread. */ +# define INSTALL_NEW_DTV(dtv) \ + ({ struct _pthread_descr_struct *__descr; \ + THREAD_SETMEM (__descr, p_header.data.dtvp, (dtv)); }) + +/* Return dtv of given thread descriptor. */ +# define GET_DTV(descr) \ + (((tcbhead_t *) (descr))->dtv) + +# ifdef __PIC__ +# define TLS_EBX_ARG "r" +# define TLS_LOAD_EBX "xchgl %3, %%ebx\n\t" +# else +# define TLS_EBX_ARG "b" +# define TLS_LOAD_EBX +# endif + +# define TLS_DO_MODIFY_LDT(descr, nr) \ +({ \ + struct modify_ldt_ldt_s ldt_entry = \ + { nr, (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ + 1, 0, 0, 1, 0, 1, 0 }; \ + int result; \ + __asm__ __volatile__ (TLS_LOAD_EBX \ + "int $0x80\n\t" \ + TLS_LOAD_EBX \ + : "=a" (result) \ + : "0" (__NR_modify_ldt), \ + /* The extra argument with the "m" constraint is necessary \ + to let the compiler know that we are accessing LDT_ENTRY \ + here. */ \ + "m" (ldt_entry), TLS_EBX_ARG (1), "c" (&ldt_entry), \ + "d" (sizeof (ldt_entry))); \ + __builtin_expect (result, 0) != 0 ? -1 : nr * 8 + 7; \ +}) + +# define TLS_DO_SET_THREAD_AREA(descr, secondcall) \ +({ \ + struct modify_ldt_ldt_s ldt_entry = \ + { -1, (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ + 1, 0, 0, 1, 0, 1, 0 }; \ + int result; \ + if (secondcall) \ + ldt_entry.entry_number = ({ int _gs; \ + __asm__ ("movw %%gs, %w0" : "=q" (_gs)); \ + (_gs & 0xffff) >> 3; }); \ + __asm__ __volatile__ (TLS_LOAD_EBX \ + "int $0x80\n\t" \ + TLS_LOAD_EBX \ + : "=a" (result), "=m" (ldt_entry.entry_number) \ + : "0" (__NR_set_thread_area), \ + /* The extra argument with the "m" constraint is necessary \ + to let the compiler know that we are accessing LDT_ENTRY \ + here. */ \ + TLS_EBX_ARG (&ldt_entry), "m" (ldt_entry)); \ + __builtin_expect (result, 0) == 0 ? ldt_entry.entry_number * 8 + 3 : -1; \ +}) + +# ifdef __ASSUME_SET_THREAD_AREA_SYSCALL +# define TLS_SETUP_GS_SEGMENT(descr, secondcall) \ + TLS_DO_SET_THREAD_AREA (descr, firstcall) +# elif defined __NR_set_thread_area +# define TLS_SETUP_GS_SEGMENT(descr, secondcall) \ + ({ int __seg = TLS_DO_SET_THREAD_AREA (descr, secondcall); \ + __seg == -1 ? TLS_DO_MODIFY_LDT (descr, 0) : __seg; }) +# else +# define TLS_SETUP_GS_SEGMENT(descr, secondcall) \ + TLS_DO_MODIFY_LDT ((descr), 0) +# endif + +/* Code to initially initialize the thread pointer. This might need + special attention since 'errno' is not yet available and if the + operation can cause a failure 'errno' must not be touched. */ +# define TLS_INIT_TP(descr, secondcall) \ + ({ \ + void *_descr = (descr); \ + tcbhead_t *head = _descr; \ + int __gs; \ + \ + head->tcb = _descr; \ + /* For now the thread descriptor is at the same address. */ \ + head->self = _descr; \ + \ + __gs = TLS_SETUP_GS_SEGMENT (_descr, secondcall); \ + if (__builtin_expect (__gs, 7) != -1) \ + { \ + __asm__ ("movw %w0, %%gs" : : "q" (__gs)); \ + __gs = 0; \ + } \ + __gs; \ + }) + + +/* Return the address of the dtv for the current thread. */ +# define THREAD_DTV() \ + ({ struct _pthread_descr_struct *__descr; \ + THREAD_GETMEM (__descr, p_header.data.dtvp); }) + +# endif /* FLOATING_STACKS && HAVE_TLS_SUPPORT */ +#endif /* __ASSEMBLER__ */ + +#endif /* tls.h */ diff --git a/libpthread/linuxthreads.old/sysdeps/i386/useldt.h b/libpthread/linuxthreads.old/sysdeps/i386/useldt.h new file mode 100644 index 000000000..02326729a --- /dev/null +++ b/libpthread/linuxthreads.old/sysdeps/i386/useldt.h @@ -0,0 +1,306 @@ +/* Special definitions for ix86 machine using segment register based + thread descriptor. + Copyright (C) 1998, 2000, 2001, 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + see <http://www.gnu.org/licenses/>. */ + +#ifndef __ASSEMBLER__ +#include <stddef.h> /* For offsetof. */ +#include <stdlib.h> /* For abort(). */ + + +/* We don't want to include the kernel header. So duplicate the + information. */ + +/* Structure passed on `modify_ldt' call. */ +struct modify_ldt_ldt_s +{ + unsigned int entry_number; + unsigned long int base_addr; + unsigned int limit; + unsigned int seg_32bit:1; + unsigned int contents:2; + unsigned int read_exec_only:1; + unsigned int limit_in_pages:1; + unsigned int seg_not_present:1; + unsigned int useable:1; + unsigned int empty:25; +}; + +/* System call to set LDT entry. */ +extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t); + + +/* Return the thread descriptor for the current thread. + + The contained asm must *not* be marked volatile since otherwise + assignments like + pthread_descr self = thread_self(); + do not get optimized away. */ +#define THREAD_SELF \ +({ \ + register pthread_descr __self; \ + __asm__ ("movl %%gs:%c1,%0" : "=r" (__self) \ + : "i" (offsetof (struct _pthread_descr_struct, \ + p_header.data.self))); \ + __self; \ +}) + + +/* Initialize the thread-unique value. Two possible ways to do it. */ + +#define DO_MODIFY_LDT(descr, nr) \ +({ \ + struct modify_ldt_ldt_s ldt_entry = \ + { nr, (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ + 1, 0, 0, 1, 0, 1, 0 }; \ + if (__modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0) \ + abort (); \ + __asm__ ("movw %w0, %%gs" : : "q" (nr * 8 + 7)); \ +}) + +#ifdef __PIC__ +# define USETLS_EBX_ARG "r" +# define USETLS_LOAD_EBX "xchgl %3, %%ebx\n\t" +#else +# define USETLS_EBX_ARG "b" +# define USETLS_LOAD_EBX +#endif + +/* When using the new set_thread_area call, we don't need to change %gs + because we inherited the value set up in the main thread by TLS setup. + We need to extract that value and set up the same segment in this + thread. */ +#if USE_TLS +# define DO_SET_THREAD_AREA_REUSE(nr) 1 +#else +/* Without TLS, we do the initialization of the main thread, where NR == 0. */ +# define DO_SET_THREAD_AREA_REUSE(nr) (!__builtin_constant_p (nr) || (nr)) +#endif +#define DO_SET_THREAD_AREA(descr, nr) \ +({ \ + int __gs; \ + if (DO_SET_THREAD_AREA_REUSE (nr)) \ + { \ + __asm__ ("movw %%gs, %w0" : "=q" (__gs)); \ + struct modify_ldt_ldt_s ldt_entry = \ + { (__gs & 0xffff) >> 3, \ + (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ + 1, 0, 0, 1, 0, 1, 0 }; \ + \ + int __result; \ + __asm__ (USETLS_LOAD_EBX \ + "movl %2, %%eax\n\t" \ + "int $0x80\n\t" \ + USETLS_LOAD_EBX \ + : "&a" (__result) \ + : USETLS_EBX_ARG (&ldt_entry), "i" (__NR_set_thread_area)); \ + if (__result == 0) \ + __asm__ ("movw %w0, %%gs" :: "q" (__gs)); \ + else \ + __gs = -1; \ + } \ + else \ + { \ + struct modify_ldt_ldt_s ldt_entry = \ + { -1, \ + (unsigned long int) (descr), 0xfffff /* 4GB in pages */, \ + 1, 0, 0, 1, 0, 1, 0 }; \ + int __result; \ + __asm__ (USETLS_LOAD_EBX \ + "movl %2, %%eax\n\t" \ + "int $0x80\n\t" \ + USETLS_LOAD_EBX \ + : "&a" (__result) \ + : USETLS_EBX_ARG (&ldt_entry), "i" (__NR_set_thread_area)); \ + if (__result == 0) \ + { \ + __gs = (ldt_entry.entry_number << 3) + 3; \ + __asm__ ("movw %w0, %%gs" : : "q" (__gs)); \ + } \ + else \ + __gs = -1; \ + } \ + __gs; \ +}) + +#if defined __ASSUME_SET_THREAD_AREA_SYSCALL +# define INIT_THREAD_SELF(descr, nr) DO_SET_THREAD_AREA (descr, nr) +#elif defined __NR_set_thread_area +# define INIT_THREAD_SELF(descr, nr) \ +({ \ + if (__builtin_expect (__have_no_set_thread_area, 0) \ + || (DO_SET_THREAD_AREA (descr, DO_SET_THREAD_AREA_REUSE (nr)) == -1 \ + && (__have_no_set_thread_area = 1))) \ + DO_MODIFY_LDT (descr, nr); \ +}) +/* Defined in pspinlock.c. */ +extern int __have_no_set_thread_area; +#else +# define INIT_THREAD_SELF(descr, nr) DO_MODIFY_LDT (descr, nr) +#endif + +/* Free resources associated with thread descriptor. */ +#ifdef __ASSUME_SET_THREAD_AREA_SYSCALL +#define FREE_THREAD(descr, nr) do { } while (0) +#elif defined __NR_set_thread_area +#define FREE_THREAD(descr, nr) \ +{ \ + int __gs; \ + __asm__ __volatile__ ("movw %%gs, %w0" : "=q" (__gs)); \ + if (__builtin_expect (__gs & 4, 0)) \ + { \ + struct modify_ldt_ldt_s ldt_entry = \ + { nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 }; \ + __modify_ldt (1, &ldt_entry, sizeof (ldt_entry)); \ + } \ +} +#else +#define FREE_THREAD(descr, nr) \ +{ \ + struct modify_ldt_ldt_s ldt_entry = \ + { nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 }; \ + __modify_ldt (1, &ldt_entry, sizeof (ldt_entry)); \ +} +#endif + +/* Read member of the thread descriptor directly. */ +#define THREAD_GETMEM(descr, member) \ +({ \ + __typeof__ (descr->member) __value; \ + if (sizeof (__value) == 1) \ + __asm__ __volatile__ ("movb %%gs:%P2,%b0" \ + : "=q" (__value) \ + : "0" (0), \ + "i" (offsetof (struct _pthread_descr_struct, \ + member))); \ + else if (sizeof (__value) == 4) \ + __asm__ __volatile__ ("movl %%gs:%P1,%0" \ + : "=r" (__value) \ + : "i" (offsetof (struct _pthread_descr_struct, \ + member))); \ + else \ + { \ + if (sizeof (__value) != 8) \ + /* There should not be any value with a size other than 1, 4 or 8. */\ + abort (); \ + \ + __asm__ __volatile__ ("movl %%gs:%P1,%%eax\n\t" \ + "movl %%gs:%P2,%%edx" \ + : "=A" (__value) \ + : "i" (offsetof (struct _pthread_descr_struct, \ + member)), \ + "i" (offsetof (struct _pthread_descr_struct, \ + member) + 4)); \ + } \ + __value; \ +}) + +/* Same as THREAD_GETMEM, but the member offset can be non-constant. */ +#define THREAD_GETMEM_NC(descr, member) \ +({ \ + __typeof__ (descr->member) __value; \ + if (sizeof (__value) == 1) \ + __asm__ __volatile__ ("movb %%gs:(%2),%b0" \ + : "=q" (__value) \ + : "0" (0), \ + "r" (offsetof (struct _pthread_descr_struct, \ + member))); \ + else if (sizeof (__value) == 4) \ + __asm__ __volatile__ ("movl %%gs:(%1),%0" \ + : "=r" (__value) \ + : "r" (offsetof (struct _pthread_descr_struct, \ + member))); \ + else \ + { \ + if (sizeof (__value) != 8) \ + /* There should not be any value with a size other than 1, 4 or 8. */\ + abort (); \ + \ + __asm__ __volatile__ ("movl %%gs:(%1),%%eax\n\t" \ + "movl %%gs:4(%1),%%edx" \ + : "=&A" (__value) \ + : "r" (offsetof (struct _pthread_descr_struct, \ + member))); \ + } \ + __value; \ +}) + +/* Same as THREAD_SETMEM, but the member offset can be non-constant. */ +#define THREAD_SETMEM(descr, member, value) \ +({ \ + __typeof__ (descr->member) __value = (value); \ + if (sizeof (__value) == 1) \ + __asm__ __volatile__ ("movb %0,%%gs:%P1" : \ + : "q" (__value), \ + "i" (offsetof (struct _pthread_descr_struct, \ + member))); \ + else if (sizeof (__value) == 4) \ + __asm__ __volatile__ ("movl %0,%%gs:%P1" : \ + : "r" (__value), \ + "i" (offsetof (struct _pthread_descr_struct, \ + member))); \ + else \ + { \ + if (sizeof (__value) != 8) \ + /* There should not be any value with a size other than 1, 4 or 8. */\ + abort (); \ + \ + __asm__ __volatile__ ("movl %%eax,%%gs:%P1\n\n" \ + "movl %%edx,%%gs:%P2" : \ + : "A" (__value), \ + "i" (offsetof (struct _pthread_descr_struct, \ + member)), \ + "i" (offsetof (struct _pthread_descr_struct, \ + member) + 4)); \ + } \ +}) + +/* Set member of the thread descriptor directly. */ +#define THREAD_SETMEM_NC(descr, member, value) \ +({ \ + __typeof__ (descr->member) __value = (value); \ + if (sizeof (__value) == 1) \ + __asm__ __volatile__ ("movb %0,%%gs:(%1)" : \ + : "q" (__value), \ + "r" (offsetof (struct _pthread_descr_struct, \ + member))); \ + else if (sizeof (__value) == 4) \ + __asm__ __volatile__ ("movl %0,%%gs:(%1)" : \ + : "r" (__value), \ + "r" (offsetof (struct _pthread_descr_struct, \ + member))); \ + else \ + { \ + if (sizeof (__value) != 8) \ + /* There should not be any value with a size other than 1, 4 or 8. */\ + abort (); \ + \ + __asm__ __volatile__ ("movl %%eax,%%gs:(%1)\n\t" \ + "movl %%edx,%%gs:4(%1)" : \ + : "A" (__value), \ + "r" (offsetof (struct _pthread_descr_struct, \ + member))); \ + } \ +}) +#endif + +/* We want the OS to assign stack addresses. */ +#define FLOATING_STACKS 1 + +/* Maximum size of the stack if the rlimit is unlimited. */ +#define ARCH_STACK_MAX_SIZE 8*1024*1024 |