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ebb5e78cc6
Add an initial implementation of a proper (i.e. an ELF shared library)
VDSO. With this commit it does not export any symbols, it only replaces
the current signal return trampoline page. A later commit will add user
implementations of gettimeofday()/clock_gettime().
To support both new toolchains and old ones which don't generate ABI
flags section, we define its content manually and then use a tool
(genvdso) to patch up the section to have the correct name and type.
genvdso also extracts symbol offsets ({,rt_}sigreturn) needed by the
kernel, and generates a C file containing a "struct mips_vdso_image"
containing both the VDSO data and these offsets. This C file is
compiled into the kernel.
On 64-bit kernels we require a different VDSO for each supported ABI,
so we may build up to 3 different VDSOs. The VDSO to use is selected by
the mips_abi structure.
A kernel/user shared data page is created and mapped below the VDSO
image. This is currently empty, but will be used by the user time
function implementations which are added later.
[markos.chandras@imgtec.com:
- Add more comments
- Move abi detection in genvdso.h since it's the get_symbol function
that needs it.
- Add an R6 specific way to calculate the base address of VDSO in order
to avoid the branch instruction which affects performance.
- Do not patch .gnu.attributes since it's not needed for dynamic linking.
- Simplify Makefile a little bit.
- checkpatch fixes
- Restrict VDSO support for binutils < 2.25 for pre-R6
- Include atomic64.h for O32 variant on MIPS64]
Signed-off-by: Alex Smith <alex.smith@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: Matthew Fortune <matthew.fortune@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11337/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
31 lines
820 B
C
31 lines
820 B
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2005, 06 by Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2005 MIPS Technologies, Inc.
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*/
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#ifndef _ASM_ABI_H
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#define _ASM_ABI_H
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#include <asm/signal.h>
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#include <asm/siginfo.h>
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#include <asm/vdso.h>
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struct mips_abi {
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int (* const setup_frame)(void *sig_return, struct ksignal *ksig,
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struct pt_regs *regs, sigset_t *set);
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int (* const setup_rt_frame)(void *sig_return, struct ksignal *ksig,
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struct pt_regs *regs, sigset_t *set);
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const unsigned long restart;
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unsigned off_sc_fpregs;
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unsigned off_sc_fpc_csr;
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unsigned off_sc_used_math;
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struct mips_vdso_image *vdso;
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};
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#endif /* _ASM_ABI_H */
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