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Joseph Myers <joseph@codesourcery.com> * sysdeps/arm/dl-machine.h (elf_machine_dynamic): Ditto. (elf_machine_load_address): Clear T bit of PLT entry contents. (RTLD_START): Mark function symbols as such. Tweak pc-relative addressing to avoid depending on pc read pipeline offset. * sysdeps/arm/machine-gmon.h (MCOUNT): Add Thumb-2 implementation. * sysdeps/arm/tls-macros.h: Add alignment for Thumb-2. (ARM_PC_OFFSET): Define. (TLS_IE): Define differently for Thumb-2. (TLS_LE, TLS_LD, TLS_GD): Use ARM_PC_OFFSET. * sysdeps/arm/elf/start.S: Switch to thumb mode for Thumb-2. * sysdeps/unix/sysv/linux/arm/eabi/sysdep.h (INTERNAL_SYSCALL_RAW): Add Thumb implementation. * sysdeps/unix/sysv/linux/arm/eabi/nptl/aio_misc.h: New. * sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind-resume.c: Enforce alignment for Thumb-2. Adjust offset from PC for Thumb-2. * sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind-forcedunwind.c: Ditto. * sysdeps/unix/sysv/linux/arm/nptl/bits/atomic.h (atomic_full_barrier, __arch_compare_and_exchange_val_32_acq): Add Thumb-2 implementation.
111 lines
4.0 KiB
C
111 lines
4.0 KiB
C
/* Copyright (C) 2005, 2006, 2007
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Daniel Jacobowitz <dan@codesourcery.com>, Oct 2005.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _LINUX_ARM_EABI_SYSDEP_H
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#define _LINUX_ARM_EABI_SYSDEP_H 1
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#include <arm/sysdep.h>
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#include <tls.h>
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#if __NR_SYSCALL_BASE != 0
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# error Kernel headers are too old
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#endif
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/* Don't use stime, even if the kernel headers define it. We have
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settimeofday, and some EABI kernels have removed stime. Similarly
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use setitimer to implement alarm. */
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#undef __NR_stime
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#undef __NR_alarm
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/* The ARM EABI user interface passes the syscall number in r7, instead
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of in the swi. This is more efficient, because the kernel does not need
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to fetch the swi from memory to find out the number; which can be painful
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with separate I-cache and D-cache. Make sure to use 0 for the SWI
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argument; otherwise the (optional) compatibility code for APCS binaries
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may be invoked. */
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#ifdef __thumb__
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/* Hide the use of r7 from the compiler, this would be a lot
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easier but for the fact that the syscalls can exceed 255.
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For the moment the LOAD_ARGS_7 is sacrificed.
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We can't use push/pop inside the asm because that breaks
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unwinding (ie. thread cancellation). */
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#undef LOAD_ARGS_7
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#undef INTERNAL_SYSCALL_RAW
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#define INTERNAL_SYSCALL_RAW(name, err, nr, args...) \
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({ \
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int _sys_buf[2]; \
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register int _a1 asm ("a1"); \
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register int *_r6 asm ("r6") = _sys_buf; \
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*_r6 = name; \
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LOAD_ARGS_##nr (args) \
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asm volatile ("str r7, [r6, #4]\n\t" \
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"ldr r7, [r6]\n\t" \
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"swi 0 @ syscall " #name "\n\t" \
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"ldr r7, [r6, #4]" \
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: "=r" (_a1) \
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: "r" (_r6) ASM_ARGS_##nr \
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: "memory"); \
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_a1; })
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#else /* ARM */
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#undef INTERNAL_SYSCALL_RAW
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#define INTERNAL_SYSCALL_RAW(name, err, nr, args...) \
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({ \
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register int _a1 asm ("r0"), _nr asm ("r7"); \
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LOAD_ARGS_##nr (args) \
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_nr = name; \
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asm volatile ("swi 0x0 @ syscall " #name \
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: "=r" (_a1) \
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: "r" (_nr) ASM_ARGS_##nr \
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: "memory"); \
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_a1; })
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#endif
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/* For EABI, non-constant syscalls are actually pretty easy... */
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#undef INTERNAL_SYSCALL_NCS
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#define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \
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INTERNAL_SYSCALL_RAW (number, err, nr, args)
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/* We must save and restore r7 (call-saved) for the syscall number.
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We never make function calls from inside here (only potentially
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signal handlers), so we do not bother with doubleword alignment.
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Just like the APCS syscall convention, the EABI syscall convention uses
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r0 through r6 for up to seven syscall arguments. None are ever passed to
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the kernel on the stack, although incoming arguments are on the stack for
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syscalls with five or more arguments.
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The assembler will convert the literal pool load to a move for most
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syscalls. */
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#undef DO_CALL
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#define DO_CALL(syscall_name, args) \
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DOARGS_##args \
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mov ip, r7; \
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ldr r7, =SYS_ify (syscall_name); \
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swi 0x0; \
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mov r7, ip; \
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UNDOARGS_##args
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#endif /* _LINUX_ARM_EABI_SYSDEP_H */
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