mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-20 14:57:39 +07:00
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
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2005, 06 by Ralf Baechle (ralf@linux-mips.org)
|
|
* Copyright (C) 2005 MIPS Technologies, Inc.
|
|
*/
|
|
#ifndef _ASM_ABI_H
|
|
#define _ASM_ABI_H
|
|
|
|
#include <asm/signal.h>
|
|
#include <asm/siginfo.h>
|
|
#include <asm/vdso.h>
|
|
|
|
struct mips_abi {
|
|
int (* const setup_frame)(void *sig_return, struct ksignal *ksig,
|
|
struct pt_regs *regs, sigset_t *set);
|
|
int (* const setup_rt_frame)(void *sig_return, struct ksignal *ksig,
|
|
struct pt_regs *regs, sigset_t *set);
|
|
const unsigned long restart;
|
|
|
|
unsigned off_sc_fpregs;
|
|
unsigned off_sc_fpc_csr;
|
|
unsigned off_sc_used_math;
|
|
|
|
struct mips_vdso_image *vdso;
|
|
};
|
|
|
|
#endif /* _ASM_ABI_H */
|