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kernel-fxtec-pro1x/arch/mips/include/asm/elf.h
Alex Smith ebb5e78cc6 MIPS: Initial implementation of a VDSO 
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>
2015-11-11 08:36:36 +01:00

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/*
* 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.
*
* Much of this is taken from binutils and GNU libc ...
*/
#ifndef _ASM_ELF_H
#define _ASM_ELF_H
#include <linux/auxvec.h>
#include <linux/fs.h>
#include <uapi/linux/elf.h>
#include <asm/cpu-info.h>
#include <asm/current.h>
/* ELF header e_flags defines. */
/* MIPS architecture level. */
#define EF_MIPS_ARCH_1 0x00000000 /* -mips1 code. */
#define EF_MIPS_ARCH_2 0x10000000 /* -mips2 code. */
#define EF_MIPS_ARCH_3 0x20000000 /* -mips3 code. */
#define EF_MIPS_ARCH_4 0x30000000 /* -mips4 code. */
#define EF_MIPS_ARCH_5 0x40000000 /* -mips5 code. */
#define EF_MIPS_ARCH_32 0x50000000 /* MIPS32 code. */
#define EF_MIPS_ARCH_64 0x60000000 /* MIPS64 code. */
#define EF_MIPS_ARCH_32R2 0x70000000 /* MIPS32 R2 code. */
#define EF_MIPS_ARCH_64R2 0x80000000 /* MIPS64 R2 code. */
/* The ABI of a file. */
#define EF_MIPS_ABI_O32 0x00001000 /* O32 ABI. */
#define EF_MIPS_ABI_O64 0x00002000 /* O32 extended for 64 bit. */
#define PT_MIPS_REGINFO 0x70000000
#define PT_MIPS_RTPROC 0x70000001
#define PT_MIPS_OPTIONS 0x70000002
#define PT_MIPS_ABIFLAGS 0x70000003
/* Flags in the e_flags field of the header */
#define EF_MIPS_NOREORDER 0x00000001
#define EF_MIPS_PIC 0x00000002
#define EF_MIPS_CPIC 0x00000004
#define EF_MIPS_ABI2 0x00000020
#define EF_MIPS_OPTIONS_FIRST 0x00000080
#define EF_MIPS_32BITMODE 0x00000100
#define EF_MIPS_FP64 0x00000200
#define EF_MIPS_ABI 0x0000f000
#define EF_MIPS_ARCH 0xf0000000
#define DT_MIPS_RLD_VERSION 0x70000001
#define DT_MIPS_TIME_STAMP 0x70000002
#define DT_MIPS_ICHECKSUM 0x70000003
#define DT_MIPS_IVERSION 0x70000004
#define DT_MIPS_FLAGS 0x70000005
#define RHF_NONE 0x00000000
#define RHF_HARDWAY 0x00000001
#define RHF_NOTPOT 0x00000002
#define RHF_SGI_ONLY 0x00000010
#define DT_MIPS_BASE_ADDRESS 0x70000006
#define DT_MIPS_CONFLICT 0x70000008
#define DT_MIPS_LIBLIST 0x70000009
#define DT_MIPS_LOCAL_GOTNO 0x7000000a
#define DT_MIPS_CONFLICTNO 0x7000000b
#define DT_MIPS_LIBLISTNO 0x70000010
#define DT_MIPS_SYMTABNO 0x70000011
#define DT_MIPS_UNREFEXTNO 0x70000012
#define DT_MIPS_GOTSYM 0x70000013
#define DT_MIPS_HIPAGENO 0x70000014
#define DT_MIPS_RLD_MAP 0x70000016
#define R_MIPS_NONE 0
#define R_MIPS_16 1
#define R_MIPS_32 2
#define R_MIPS_REL32 3
#define R_MIPS_26 4
#define R_MIPS_HI16 5
#define R_MIPS_LO16 6
#define R_MIPS_GPREL16 7
#define R_MIPS_LITERAL 8
#define R_MIPS_GOT16 9
#define R_MIPS_PC16 10
#define R_MIPS_CALL16 11
#define R_MIPS_GPREL32 12
/* The remaining relocs are defined on Irix, although they are not
in the MIPS ELF ABI. */
#define R_MIPS_UNUSED1 13
#define R_MIPS_UNUSED2 14
#define R_MIPS_UNUSED3 15
#define R_MIPS_SHIFT5 16
#define R_MIPS_SHIFT6 17
#define R_MIPS_64 18
#define R_MIPS_GOT_DISP 19
#define R_MIPS_GOT_PAGE 20
#define R_MIPS_GOT_OFST 21
/*
* The following two relocation types are specified in the MIPS ABI
* conformance guide version 1.2 but not yet in the psABI.
*/
#define R_MIPS_GOTHI16 22
#define R_MIPS_GOTLO16 23
#define R_MIPS_SUB 24
#define R_MIPS_INSERT_A 25
#define R_MIPS_INSERT_B 26
#define R_MIPS_DELETE 27
#define R_MIPS_HIGHER 28
#define R_MIPS_HIGHEST 29
/*
* The following two relocation types are specified in the MIPS ABI
* conformance guide version 1.2 but not yet in the psABI.
*/
#define R_MIPS_CALLHI16 30
#define R_MIPS_CALLLO16 31
/*
* This range is reserved for vendor specific relocations.
*/
#define R_MIPS_LOVENDOR 100
#define R_MIPS_HIVENDOR 127
#define SHN_MIPS_ACCOMON 0xff00 /* Allocated common symbols */
#define SHN_MIPS_TEXT 0xff01 /* Allocated test symbols. */
#define SHN_MIPS_DATA 0xff02 /* Allocated data symbols. */
#define SHN_MIPS_SCOMMON 0xff03 /* Small common symbols */
#define SHN_MIPS_SUNDEFINED 0xff04 /* Small undefined symbols */
#define SHT_MIPS_LIST 0x70000000
#define SHT_MIPS_CONFLICT 0x70000002
#define SHT_MIPS_GPTAB 0x70000003
#define SHT_MIPS_UCODE 0x70000004
#define SHT_MIPS_DEBUG 0x70000005
#define SHT_MIPS_REGINFO 0x70000006
#define SHT_MIPS_PACKAGE 0x70000007
#define SHT_MIPS_PACKSYM 0x70000008
#define SHT_MIPS_RELD 0x70000009
#define SHT_MIPS_IFACE 0x7000000b
#define SHT_MIPS_CONTENT 0x7000000c
#define SHT_MIPS_OPTIONS 0x7000000d
#define SHT_MIPS_SHDR 0x70000010
#define SHT_MIPS_FDESC 0x70000011
#define SHT_MIPS_EXTSYM 0x70000012
#define SHT_MIPS_DENSE 0x70000013
#define SHT_MIPS_PDESC 0x70000014
#define SHT_MIPS_LOCSYM 0x70000015
#define SHT_MIPS_AUXSYM 0x70000016
#define SHT_MIPS_OPTSYM 0x70000017
#define SHT_MIPS_LOCSTR 0x70000018
#define SHT_MIPS_LINE 0x70000019
#define SHT_MIPS_RFDESC 0x7000001a
#define SHT_MIPS_DELTASYM 0x7000001b
#define SHT_MIPS_DELTAINST 0x7000001c
#define SHT_MIPS_DELTACLASS 0x7000001d
#define SHT_MIPS_DWARF 0x7000001e
#define SHT_MIPS_DELTADECL 0x7000001f
#define SHT_MIPS_SYMBOL_LIB 0x70000020
#define SHT_MIPS_EVENTS 0x70000021
#define SHT_MIPS_TRANSLATE 0x70000022
#define SHT_MIPS_PIXIE 0x70000023
#define SHT_MIPS_XLATE 0x70000024
#define SHT_MIPS_XLATE_DEBUG 0x70000025
#define SHT_MIPS_WHIRL 0x70000026
#define SHT_MIPS_EH_REGION 0x70000027
#define SHT_MIPS_XLATE_OLD 0x70000028
#define SHT_MIPS_PDR_EXCEPTION 0x70000029
#define SHF_MIPS_GPREL 0x10000000
#define SHF_MIPS_MERGE 0x20000000
#define SHF_MIPS_ADDR 0x40000000
#define SHF_MIPS_STRING 0x80000000
#define SHF_MIPS_NOSTRIP 0x08000000
#define SHF_MIPS_LOCAL 0x04000000
#define SHF_MIPS_NAMES 0x02000000
#define SHF_MIPS_NODUPES 0x01000000
#ifndef ELF_ARCH
/* ELF register definitions */
#define ELF_NGREG 45
#define ELF_NFPREG 33
typedef unsigned long elf_greg_t;
typedef elf_greg_t elf_gregset_t[ELF_NGREG];
typedef double elf_fpreg_t;
typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
struct mips_elf_abiflags_v0 {
uint16_t version; /* Version of flags structure */
uint8_t isa_level; /* The level of the ISA: 1-5, 32, 64 */
uint8_t isa_rev; /* The revision of ISA: 0 for MIPS V and below,
1-n otherwise */
uint8_t gpr_size; /* The size of general purpose registers */
uint8_t cpr1_size; /* The size of co-processor 1 registers */
uint8_t cpr2_size; /* The size of co-processor 2 registers */
uint8_t fp_abi; /* The floating-point ABI */
uint32_t isa_ext; /* Mask of processor-specific extensions */
uint32_t ases; /* Mask of ASEs used */
uint32_t flags1; /* Mask of general flags */
uint32_t flags2;
};
#define MIPS_ABI_FP_ANY 0 /* FP ABI doesn't matter */
#define MIPS_ABI_FP_DOUBLE 1 /* -mdouble-float */
#define MIPS_ABI_FP_SINGLE 2 /* -msingle-float */
#define MIPS_ABI_FP_SOFT 3 /* -msoft-float */
#define MIPS_ABI_FP_OLD_64 4 /* -mips32r2 -mfp64 */
#define MIPS_ABI_FP_XX 5 /* -mfpxx */
#define MIPS_ABI_FP_64 6 /* -mips32r2 -mfp64 */
#define MIPS_ABI_FP_64A 7 /* -mips32r2 -mfp64 -mno-odd-spreg */
#ifdef CONFIG_32BIT
/*
* In order to be sure that we don't attempt to execute an O32 binary which
* requires 64 bit FP (FR=1) on a system which does not support it we refuse
* to execute any binary which has bits specified by the following macro set
* in its ELF header flags.
*/
#ifdef CONFIG_MIPS_O32_FP64_SUPPORT
# define __MIPS_O32_FP64_MUST_BE_ZERO 0
#else
# define __MIPS_O32_FP64_MUST_BE_ZERO EF_MIPS_FP64
#endif
/*
* This is used to ensure we don't load something for the wrong architecture.
*/
#define elf_check_arch(hdr) \
({ \
int __res = 1; \
struct elfhdr *__h = (hdr); \
\
if (__h->e_machine != EM_MIPS) \
__res = 0; \
if (__h->e_ident[EI_CLASS] != ELFCLASS32) \
__res = 0; \
if ((__h->e_flags & EF_MIPS_ABI2) != 0) \
__res = 0; \
if (((__h->e_flags & EF_MIPS_ABI) != 0) && \
((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32)) \
__res = 0; \
if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO) \
__res = 0; \
\
__res; \
})
/*
* These are used to set parameters in the core dumps.
*/
#define ELF_CLASS ELFCLASS32
#endif /* CONFIG_32BIT */
#ifdef CONFIG_64BIT
/*
* This is used to ensure we don't load something for the wrong architecture.
*/
#define elf_check_arch(hdr) \
({ \
int __res = 1; \
struct elfhdr *__h = (hdr); \
\
if (__h->e_machine != EM_MIPS) \
__res = 0; \
if (__h->e_ident[EI_CLASS] != ELFCLASS64) \
__res = 0; \
\
__res; \
})
/*
* These are used to set parameters in the core dumps.
*/
#define ELF_CLASS ELFCLASS64
#endif /* CONFIG_64BIT */
/*
* These are used to set parameters in the core dumps.
*/
#ifdef __MIPSEB__
#define ELF_DATA ELFDATA2MSB
#elif defined(__MIPSEL__)
#define ELF_DATA ELFDATA2LSB
#endif
#define ELF_ARCH EM_MIPS
#endif /* !defined(ELF_ARCH) */
struct mips_abi;
extern struct mips_abi mips_abi;
extern struct mips_abi mips_abi_32;
extern struct mips_abi mips_abi_n32;
#ifdef CONFIG_32BIT
#define SET_PERSONALITY2(ex, state) \
do { \
if (personality(current->personality) != PER_LINUX) \
set_personality(PER_LINUX); \
\
clear_thread_flag(TIF_HYBRID_FPREGS); \
set_thread_flag(TIF_32BIT_FPREGS); \
\
mips_set_personality_fp(state); \
\
current->thread.abi = &mips_abi; \
\
current->thread.fpu.fcr31 = boot_cpu_data.fpu_csr31; \
} while (0)
#endif /* CONFIG_32BIT */
#ifdef CONFIG_64BIT
#ifdef CONFIG_MIPS32_N32
#define __SET_PERSONALITY32_N32() \
do { \
set_thread_flag(TIF_32BIT_ADDR); \
current->thread.abi = &mips_abi_n32; \
} while (0)
#else
#define __SET_PERSONALITY32_N32() \
do { } while (0)
#endif
#ifdef CONFIG_MIPS32_O32
#define __SET_PERSONALITY32_O32(ex, state) \
do { \
set_thread_flag(TIF_32BIT_REGS); \
set_thread_flag(TIF_32BIT_ADDR); \
clear_thread_flag(TIF_HYBRID_FPREGS); \
set_thread_flag(TIF_32BIT_FPREGS); \
\
mips_set_personality_fp(state); \
\
current->thread.abi = &mips_abi_32; \
} while (0)
#else
#define __SET_PERSONALITY32_O32(ex, state) \
do { } while (0)
#endif
#ifdef CONFIG_MIPS32_COMPAT
#define __SET_PERSONALITY32(ex, state) \
do { \
if ((((ex).e_flags & EF_MIPS_ABI2) != 0) && \
((ex).e_flags & EF_MIPS_ABI) == 0) \
__SET_PERSONALITY32_N32(); \
else \
__SET_PERSONALITY32_O32(ex, state); \
} while (0)
#else
#define __SET_PERSONALITY32(ex, state) do { } while (0)
#endif
#define SET_PERSONALITY2(ex, state) \
do { \
unsigned int p; \
\
clear_thread_flag(TIF_32BIT_REGS); \
clear_thread_flag(TIF_32BIT_FPREGS); \
clear_thread_flag(TIF_HYBRID_FPREGS); \
clear_thread_flag(TIF_32BIT_ADDR); \
\
if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \
__SET_PERSONALITY32(ex, state); \
else \
current->thread.abi = &mips_abi; \
\
current->thread.fpu.fcr31 = boot_cpu_data.fpu_csr31; \
\
p = personality(current->personality); \
if (p != PER_LINUX32 && p != PER_LINUX) \
set_personality(PER_LINUX); \
} while (0)
#endif /* CONFIG_64BIT */
#define CORE_DUMP_USE_REGSET
#define ELF_EXEC_PAGESIZE PAGE_SIZE
/* This yields a mask that user programs can use to figure out what
instruction set this cpu supports. This could be done in userspace,
but it's not easy, and we've already done it here. */
#define ELF_HWCAP (elf_hwcap)
extern unsigned int elf_hwcap;
#include <asm/hwcap.h>
/*
* This yields a string that ld.so will use to load implementation
* specific libraries for optimization. This is more specific in
* intent than poking at uname or /proc/cpuinfo.
*/
#define ELF_PLATFORM __elf_platform
extern const char *__elf_platform;
/*
* See comments in asm-alpha/elf.h, this is the same thing
* on the MIPS.
*/
#define ELF_PLAT_INIT(_r, load_addr) do { \
_r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0; \
_r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0; \
_r->regs[9] = _r->regs[10] = _r->regs[11] = _r->regs[12] = 0; \
_r->regs[13] = _r->regs[14] = _r->regs[15] = _r->regs[16] = 0; \
_r->regs[17] = _r->regs[18] = _r->regs[19] = _r->regs[20] = 0; \
_r->regs[21] = _r->regs[22] = _r->regs[23] = _r->regs[24] = 0; \
_r->regs[25] = _r->regs[26] = _r->regs[27] = _r->regs[28] = 0; \
_r->regs[30] = _r->regs[31] = 0; \
} while (0)
/* This is the location that an ET_DYN program is loaded if exec'ed. Typical
use of this is to invoke "./ld.so someprog" to test out a new version of
the loader. We need to make sure that it is out of the way of the program
that it will "exec", and that there is sufficient room for the brk. */
#ifndef ELF_ET_DYN_BASE
#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
#endif
#define ARCH_DLINFO \
do { \
NEW_AUX_ENT(AT_SYSINFO_EHDR, \
(unsigned long)current->mm->context.vdso); \
} while (0)
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
struct linux_binprm;
extern int arch_setup_additional_pages(struct linux_binprm *bprm,
int uses_interp);
struct arch_elf_state {
int fp_abi;
int interp_fp_abi;
int overall_fp_mode;
};
#define MIPS_ABI_FP_UNKNOWN (-1) /* Unknown FP ABI (kernel internal) */
#define INIT_ARCH_ELF_STATE { \
.fp_abi = MIPS_ABI_FP_UNKNOWN, \
.interp_fp_abi = MIPS_ABI_FP_UNKNOWN, \
.overall_fp_mode = -1, \
}
extern int arch_elf_pt_proc(void *ehdr, void *phdr, struct file *elf,
bool is_interp, struct arch_elf_state *state);
extern int arch_check_elf(void *ehdr, bool has_interpreter,
struct arch_elf_state *state);
extern void mips_set_personality_fp(struct arch_elf_state *state);
#endif /* _ASM_ELF_H */
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