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78410af511
This change adds support for clock_gettime with CLOCK_REALTIME and CLOCK_MONOTONIC using vDSO. It also updates the vdso struct nomenclature used for the clocks to match the x86 code to keep it easier to update going forward. We also support the *_COARSE clockid_t, for apps that want speed but aren't concerned about fine-grained timestamps; this saves about 20 cycles per call (see http://lwn.net/Articles/342018/). Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: John Stultz <john.stultz@linaro.org>
90 lines
2.2 KiB
ArmAsm
90 lines
2.2 KiB
ArmAsm
/*
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* Copyright 2012 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#define VDSO_VERSION_STRING LINUX_2.6
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OUTPUT_ARCH(tile)
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/* The ELF entry point can be used to set the AT_SYSINFO value. */
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ENTRY(__vdso_rt_sigreturn);
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SECTIONS
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{
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. = SIZEOF_HEADERS;
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.hash : { *(.hash) } :text
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.gnu.hash : { *(.gnu.hash) }
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.dynsym : { *(.dynsym) }
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.dynstr : { *(.dynstr) }
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.gnu.version : { *(.gnu.version) }
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.gnu.version_d : { *(.gnu.version_d) }
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.gnu.version_r : { *(.gnu.version_r) }
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.note : { *(.note.*) } :text :note
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.dynamic : { *(.dynamic) } :text :dynamic
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.eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
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.eh_frame : { KEEP (*(.eh_frame)) } :text
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.rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
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/*
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* This linker script is used both with -r and with -shared.
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* For the layouts to match, we need to skip more than enough
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* space for the dynamic symbol table et al. If this amount
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* is insufficient, ld -shared will barf. Just increase it here.
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*/
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. = 0x1000;
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.text : { *(.text .text.*) } :text
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.data : {
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*(.got.plt) *(.got)
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*(.data .data.* .gnu.linkonce.d.*)
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*(.dynbss)
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*(.bss .bss.* .gnu.linkonce.b.*)
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}
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}
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/*
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* We must supply the ELF program headers explicitly to get just one
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* PT_LOAD segment, and set the flags explicitly to make segments read-only.
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*/
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PHDRS
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{
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text PT_LOAD FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
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dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
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note PT_NOTE FLAGS(4); /* PF_R */
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eh_frame_hdr PT_GNU_EH_FRAME;
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}
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/*
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* This controls what userland symbols we export from the vDSO.
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*/
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VERSION
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{
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VDSO_VERSION_STRING {
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global:
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__vdso_rt_sigreturn;
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__vdso_gettimeofday;
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gettimeofday;
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__vdso_clock_gettime;
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clock_gettime;
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local:*;
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};
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}
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