133 lines
5.5 KiB
C
133 lines
5.5 KiB
C
/* THREAD_* accessors. x86_64 version.
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Copyright (C) 2002-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* Read member of the thread descriptor directly. */
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# define THREAD_GETMEM(descr, member) \
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({ __typeof (descr->member) __value; \
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_Static_assert (sizeof (__value) == 1 \
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|| sizeof (__value) == 4 \
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|| sizeof (__value) == 8, \
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"size of per-thread data"); \
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if (sizeof (__value) == 1) \
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asm volatile ("movb %%fs:%P2,%b0" \
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: "=q" (__value) \
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: "0" (0), "i" (offsetof (struct pthread, member))); \
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else if (sizeof (__value) == 4) \
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asm volatile ("movl %%fs:%P1,%0" \
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: "=r" (__value) \
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: "i" (offsetof (struct pthread, member))); \
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else /* 8 */ \
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{ \
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asm volatile ("movq %%fs:%P1,%q0" \
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: "=r" (__value) \
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: "i" (offsetof (struct pthread, member))); \
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} \
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__value; })
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/* THREAD_GETMEM already forces a read. */
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#define THREAD_GETMEM_VOLATILE(descr, member) THREAD_GETMEM (descr, member)
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/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
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# define THREAD_GETMEM_NC(descr, member, idx) \
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({ __typeof (descr->member[0]) __value; \
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_Static_assert (sizeof (__value) == 1 \
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|| sizeof (__value) == 4 \
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|| sizeof (__value) == 8, \
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"size of per-thread data"); \
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if (sizeof (__value) == 1) \
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asm volatile ("movb %%fs:%P2(%q3),%b0" \
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: "=q" (__value) \
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: "0" (0), "i" (offsetof (struct pthread, member[0])), \
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"r" (idx)); \
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else if (sizeof (__value) == 4) \
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asm volatile ("movl %%fs:%P1(,%q2,4),%0" \
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: "=r" (__value) \
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: "i" (offsetof (struct pthread, member[0])), "r" (idx));\
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else /* 8 */ \
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{ \
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asm volatile ("movq %%fs:%P1(,%q2,8),%q0" \
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: "=r" (__value) \
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: "i" (offsetof (struct pthread, member[0])), \
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"r" (idx)); \
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} \
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__value; })
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/* Loading addresses of objects on x86-64 needs to be treated special
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when generating PIC code. */
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#ifdef __pic__
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# define IMM_MODE "nr"
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#else
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# define IMM_MODE "ir"
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#endif
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/* Set member of the thread descriptor directly. */
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# define THREAD_SETMEM(descr, member, value) \
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({ \
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_Static_assert (sizeof (descr->member) == 1 \
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|| sizeof (descr->member) == 4 \
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|| sizeof (descr->member) == 8, \
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"size of per-thread data"); \
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if (sizeof (descr->member) == 1) \
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asm volatile ("movb %b0,%%fs:%P1" : \
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: "iq" (value), \
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"i" (offsetof (struct pthread, member))); \
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else if (sizeof (descr->member) == 4) \
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asm volatile ("movl %0,%%fs:%P1" : \
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: IMM_MODE (value), \
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"i" (offsetof (struct pthread, member))); \
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else /* 8 */ \
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{ \
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/* Since movq takes a signed 32-bit immediate or a register source \
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operand, use "er" constraint for 32-bit signed integer constant \
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or register. */ \
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asm volatile ("movq %q0,%%fs:%P1" : \
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: "er" ((uint64_t) cast_to_integer (value)), \
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"i" (offsetof (struct pthread, member))); \
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}})
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/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
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# define THREAD_SETMEM_NC(descr, member, idx, value) \
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({ \
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_Static_assert (sizeof (descr->member[0]) == 1 \
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|| sizeof (descr->member[0]) == 4 \
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|| sizeof (descr->member[0]) == 8, \
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"size of per-thread data"); \
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if (sizeof (descr->member[0]) == 1) \
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asm volatile ("movb %b0,%%fs:%P1(%q2)" : \
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: "iq" (value), \
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"i" (offsetof (struct pthread, member[0])), \
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"r" (idx)); \
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else if (sizeof (descr->member[0]) == 4) \
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asm volatile ("movl %0,%%fs:%P1(,%q2,4)" : \
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: IMM_MODE (value), \
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"i" (offsetof (struct pthread, member[0])), \
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"r" (idx)); \
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else /* 8 */ \
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{ \
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/* Since movq takes a signed 32-bit immediate or a register source \
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operand, use "er" constraint for 32-bit signed integer constant \
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or register. */ \
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asm volatile ("movq %q0,%%fs:%P1(,%q2,8)" : \
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: "er" ((uint64_t) cast_to_integer (value)), \
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"i" (offsetof (struct pthread, member[0])), \
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"r" (idx)); \
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}})
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