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hurd: add TLS support
* sysdeps/generic/thread_state.h (MACHINE_NEW_THREAD_STATE_FLAVOR): Define macro. * sysdeps/mach/thread_state.h (MACHINE_THREAD_STATE_FIX_NEW): New macro. * sysdeps/mach/i386/thread_state.h (MACHINE_NEW_THREAD_STATE_FLAVOR): New macro, defined to i386_THREAD_STATE. (MACHINE_THREAD_STATE_FLAVOR): Define to i386_REGS_SEGS_STATE instead of i386_THREAD_STATE. (MACHINE_THREAD_STATE_FIX_NEW): New macro, reads segments. * sysdeps/mach/hurd/i386/trampoline.c (_hurd_setup_sighandler): Use i386_REGS_SEGS_STATE instead of i386_THREAD_STATE. * sysdeps/mach/hurd/i386/tls.h (TCB_ALIGNMENT, HURD_SEL_LDT): New macros. (_hurd_tls_fork): Add original thread parameter, Duplicate existing LDT descriptor instead of creating a new one. (_hurd_tls_new): New function, creates a new descriptor and updates tcb. * mach/setup-thread.c: Include <ldsodefs.h>. (__mach_setup_thread): Call _dl_allocate_tls, pass MACHINE_NEW_THREAD_STATE_FLAVOR to __thread_set_state instead of MACHINE_THREAD_STATE_FLAVOR, before getting MACHINE_THREAD_STATE_FLAVOR, calling _hurd_tls_new, and setting MACHINE_THREAD_STATE_FLAVOR with the result. * hurd/hurdfault.c (_hurdsig_fault_init): Call MACHINE_THREAD_STATE_FIX_NEW. * sysdeps/mach/hurd/fork.c (__fork): Call _hurd_tls_fork for sigthread too. Add original thread parameter.
This commit is contained in:
Samuel Thibault
parent
c553cd6f7e
commit
f8baf2a224
32
ChangeLog
32
ChangeLog
@ -1,3 +1,35 @@
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2018-03-16 Samuel Thibault <samuel.thibault@ens-lyon.org>
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* sysdeps/generic/thread_state.h (MACHINE_NEW_THREAD_STATE_FLAVOR):
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Define macro.
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* sysdeps/mach/thread_state.h (MACHINE_THREAD_STATE_FIX_NEW): New macro.
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* sysdeps/mach/i386/thread_state.h
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(MACHINE_NEW_THREAD_STATE_FLAVOR): New macro, defined to
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i386_THREAD_STATE.
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(MACHINE_THREAD_STATE_FLAVOR): Define to i386_REGS_SEGS_STATE instead of
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i386_THREAD_STATE.
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(MACHINE_THREAD_STATE_FIX_NEW): New macro, reads segments.
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* sysdeps/mach/hurd/i386/trampoline.c (_hurd_setup_sighandler): Use
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i386_REGS_SEGS_STATE instead of i386_THREAD_STATE.
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* sysdeps/mach/hurd/i386/tls.h (TCB_ALIGNMENT, HURD_SEL_LDT): New
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macros.
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(_hurd_tls_fork): Add original thread parameter, Duplicate existing LDT
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descriptor instead of creating a new one.
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(_hurd_tls_new): New function, creates a new descriptor and updates tcb.
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* mach/setup-thread.c: Include <ldsodefs.h>.
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(__mach_setup_thread): Call _dl_allocate_tls, pass
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MACHINE_NEW_THREAD_STATE_FLAVOR to __thread_set_state instead of
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MACHINE_THREAD_STATE_FLAVOR, before getting
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MACHINE_THREAD_STATE_FLAVOR, calling _hurd_tls_new, and setting
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MACHINE_THREAD_STATE_FLAVOR with the result.
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* hurd/hurdfault.c (_hurdsig_fault_init): Call
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MACHINE_THREAD_STATE_FIX_NEW.
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* sysdeps/mach/hurd/fork.c (__fork): Call _hurd_tls_fork for sigthread
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too. Add original thread parameter.
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2018-03-16 Joseph Myers <joseph@codesourcery.com>
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* sysdeps/x86/fpu/bits/mathinline.h [__USE_MISC] (__finite):
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@ -204,6 +204,7 @@ _hurdsig_fault_init (void)
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/* This state will be restored when we fault.
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It runs the function above. */
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memset (&state, 0, sizeof state);
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MACHINE_THREAD_STATE_FIX_NEW (&state);
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MACHINE_THREAD_STATE_SET_PC (&state, faulted);
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MACHINE_THREAD_STATE_SET_SP (&state, faultstack, sizeof faultstack);
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@ -19,6 +19,7 @@
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#include <thread_state.h>
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#include <string.h>
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#include <mach/machine/vm_param.h>
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#include <ldsodefs.h>
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#include "sysdep.h" /* Defines stack direction. */
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#define STACK_SIZE (16 * 1024 * 1024) /* 16MB, arbitrary. */
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@ -41,6 +42,7 @@ __mach_setup_thread (task_t task, thread_t thread, void *pc,
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vm_address_t stack;
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vm_size_t size;
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int anywhere;
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tcbhead_t *tcb;
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size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE;
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stack = stack_base ? *stack_base ? : 0 : 0;
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@ -50,6 +52,10 @@ __mach_setup_thread (task_t task, thread_t thread, void *pc,
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if (error)
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return error;
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tcb = _dl_allocate_tls(NULL);
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if (tcb == NULL)
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return KERN_RESOURCE_SHORTAGE;
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if (stack_size)
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*stack_size = size;
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@ -72,8 +78,21 @@ __mach_setup_thread (task_t task, thread_t thread, void *pc,
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if (error = __vm_protect (task, stack, __vm_page_size, 0, VM_PROT_NONE))
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return error;
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return __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
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if (error = __thread_set_state (thread, MACHINE_NEW_THREAD_STATE_FLAVOR,
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(natural_t *) &ts, tssize))
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return error;
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if (error = __thread_get_state (thread, MACHINE_THREAD_STATE_FLAVOR,
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(natural_t *) &ts, &tssize))
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return error;
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assert (tssize == MACHINE_THREAD_STATE_COUNT);
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_hurd_tls_new(thread, &ts, tcb);
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error = __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
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(natural_t *) &ts, tssize);
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return error;
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}
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weak_alias (__mach_setup_thread, mach_setup_thread)
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@ -22,6 +22,11 @@
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/* Replace <machine> with "i386" or "mips" or whatever. */
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/* This lets the kernel define architecture-specific registers for a new
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thread. */
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#define MACHINE_NEW_THREAD_STATE_FLAVOR <machine>_NEW_THREAD_STATE
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/* This makes the kernel load all architectures-specific registers for the
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thread. */
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#define MACHINE_THREAD_STATE_FLAVOR <machine>_THREAD_STATE
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#define MACHINE_THREAD_STATE_COUNT <machine>_THREAD_STATE_COUNT
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@ -507,6 +507,11 @@ __fork (void)
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#endif
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MACHINE_THREAD_STATE_SET_PC (&state,
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(unsigned long int) _hurd_msgport_receive);
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/* Do special signal thread setup for TLS if needed. */
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if (err = _hurd_tls_fork (sigthread, _hurd_msgport_thread, &state))
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LOSE;
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if (err = __thread_set_state (sigthread, MACHINE_THREAD_STATE_FLAVOR,
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(natural_t *) &state, statecount))
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LOSE;
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@ -517,7 +522,7 @@ __fork (void)
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_hurd_longjmp_thread_state (&state, env, 1);
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/* Do special thread setup for TLS if needed. */
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if (err = _hurd_tls_fork (thread, &state))
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if (err = _hurd_tls_fork (thread, ss->thread, &state))
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LOSE;
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if (err = __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
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@ -52,6 +52,15 @@ typedef struct
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#define TLS_TCB_AT_TP 1
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#define TLS_DTV_AT_TP 0
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/* Alignment requirement for TCB.
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Some processors such as Intel Atom pay a big penalty on every
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access using a segment override if that segment's base is not
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aligned to the size of a cache line. (See Intel 64 and IA-32
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Architectures Optimization Reference Manual, section 13.3.3.3,
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"Segment Base".) On such machines, a cache line is 64 bytes. */
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#define TCB_ALIGNMENT 64
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#ifndef __ASSEMBLER__
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/* Use i386-specific RPCs to arrange that %gs segment register prefix
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@ -78,6 +87,7 @@ typedef struct
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| (((unsigned int) (tcb)) & 0xff000000) /* base 24..31 */ \
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}
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# define HURD_SEL_LDT(sel) (__builtin_expect((sel) & 4, 0))
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static inline const char * __attribute__ ((unused))
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_hurd_tls_init (tcbhead_t *tcb)
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@ -141,9 +151,40 @@ _hurd_tls_init (tcbhead_t *tcb)
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# include <mach/machine/thread_status.h>
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/* Set up TLS in the new thread of a fork child, copying from our own. */
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static inline error_t __attribute__ ((unused))
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_hurd_tls_fork (thread_t child, struct i386_thread_state *state)
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/* Set up TLS in the new thread of a fork child, copying from the original. */
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static inline kern_return_t __attribute__ ((unused))
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_hurd_tls_fork (thread_t child, thread_t orig, struct i386_thread_state *state)
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{
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/* Fetch the selector set by _hurd_tls_init. */
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int sel;
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asm ("mov %%gs, %w0" : "=q" (sel) : "0" (0));
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if (sel == state->ds) /* _hurd_tls_init was never called. */
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return 0;
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struct descriptor desc, *_desc = &desc;
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error_t err;
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unsigned int count = 1;
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if (HURD_SEL_LDT(sel))
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err = __i386_get_ldt (orig, sel, 1, &_desc, &count);
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else
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err = __i386_get_gdt (orig, sel, &desc);
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assert_perror (err);
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if (err)
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return err;
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if (HURD_SEL_LDT(sel))
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err = __i386_set_ldt (child, sel, &desc, 1);
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else
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err = __i386_set_gdt (child, &sel, desc);
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state->gs = sel;
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return err;
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}
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static inline kern_return_t __attribute__ ((unused))
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_hurd_tls_new (thread_t child, struct i386_thread_state *state, tcbhead_t *tcb)
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{
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/* Fetch the selector set by _hurd_tls_init. */
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int sel;
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@ -151,11 +192,13 @@ _hurd_tls_fork (thread_t child, struct i386_thread_state *state)
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if (sel == state->ds) /* _hurd_tls_init was never called. */
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return 0;
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tcbhead_t *const tcb = THREAD_SELF;
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HURD_TLS_DESC_DECL (desc, tcb);
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error_t err;
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if (__builtin_expect (sel, 0x50) & 4) /* LDT selector */
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tcb->tcb = tcb;
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tcb->self = child;
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if (HURD_SEL_LDT(sel))
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err = __i386_set_ldt (child, sel, &desc, 1);
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else
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err = __i386_set_gdt (child, &sel, desc);
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@ -62,7 +62,7 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
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sizeof (state->basic));
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memcpy (&state->fpu, &ss->context->sc_i386_float_state,
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sizeof (state->fpu));
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state->set |= (1 << i386_THREAD_STATE) | (1 << i386_FLOAT_STATE);
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state->set |= (1 << i386_REGS_SEGS_STATE) | (1 << i386_FLOAT_STATE);
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}
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}
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@ -21,7 +21,10 @@
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#include <mach/machine/thread_status.h>
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#define MACHINE_THREAD_STATE_FLAVOR i386_THREAD_STATE
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/* This lets the kernel define segments for a new thread. */
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#define MACHINE_NEW_THREAD_STATE_FLAVOR i386_THREAD_STATE
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/* This makes the kernel load our segments descriptors. */
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#define MACHINE_THREAD_STATE_FLAVOR i386_REGS_SEGS_STATE
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#define MACHINE_THREAD_STATE_COUNT i386_THREAD_STATE_COUNT
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#define machine_thread_state i386_thread_state
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@ -30,6 +33,14 @@
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#define SP uesp
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#define SYSRETURN eax
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#define MACHINE_THREAD_STATE_FIX_NEW(ts) do { \
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asm ("mov %%cs, %w0" : "=q" ((ts)->cs)); \
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asm ("mov %%ds, %w0" : "=q" ((ts)->ds)); \
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asm ("mov %%es, %w0" : "=q" ((ts)->es)); \
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asm ("mov %%fs, %w0" : "=q" ((ts)->fs)); \
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asm ("mov %%gs, %w0" : "=q" ((ts)->gs)); \
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} while(0)
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struct machine_thread_all_state
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{
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int set; /* Mask of bits (1 << FLAVOR). */
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@ -38,6 +38,12 @@
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#endif
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#endif
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/* This copies architecture-specific bits from the current thread to the new
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thread state. */
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#ifndef MACHINE_THREAD_STATE_FIX_NEW
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# define MACHINE_THREAD_STATE_FIX_NEW(ts)
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#endif
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/* These functions are of use in machine-dependent signal trampoline
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implementations. */
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