/*
* include/asm-xtensa/elf.h
*
* ELF register definitions
*
* 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) 2001 - 2005 Tensilica Inc.
*/
#ifndef _XTENSA_ELF_H
#define _XTENSA_ELF_H
#include <asm/ptrace.h>
#include <asm/coprocessor.h>
#include <xtensa/config/core.h>
/* Xtensa processor ELF architecture-magic number */
#define EM_XTENSA 94
#define EM_XTENSA_OLD 0xABC7
/* ELF register definitions. This is needed for core dump support. */
/*
* elf_gregset_t contains the application-level state in the following order:
* Processor info: config_version, cpuxy
* Processor state: pc, ps, exccause, excvaddr, wb, ws,
* lbeg, lend, lcount, sar
* GP regs: ar0 - arXX
*/
typedef unsigned long elf_greg_t;
typedef struct {
elf_greg_t xchal_config_id0;
elf_greg_t xchal_config_id1;
elf_greg_t cpux;
elf_greg_t cpuy;
elf_greg_t pc;
elf_greg_t ps;
elf_greg_t exccause;
elf_greg_t excvaddr;
elf_greg_t windowbase;
elf_greg_t windowstart;
elf_greg_t lbeg;
elf_greg_t lend;
elf_greg_t lcount;
elf_greg_t sar;
elf_greg_t syscall;
elf_greg_t ar[XCHAL_NUM_AREGS];
} xtensa_gregset_t;
#define ELF_NGREG (sizeof(xtensa_gregset_t) / sizeof(elf_greg_t))
typedef elf_greg_t elf_gregset_t[ELF_NGREG];
/*
* Compute the size of the coprocessor and extra state layout (register info)
* table (in bytes).
* This is actually the maximum size of the table, as opposed to the size,
* which is available from the _xtensa_reginfo_table_size global variable.
*
* (See also arch/xtensa/kernel/coprocessor.S)
*
*/
#ifndef XCHAL_EXTRA_SA_CONTENTS_LIBDB_NUM
# define XTENSA_CPE_LTABLE_SIZE 0
#else
# define XTENSA_CPE_SEGMENT(num) (num ? (1+num) : 0)
# define XTENSA_CPE_LTABLE_ENTRIES \
( XTENSA_CPE_SEGMENT(XCHAL_EXTRA_SA_CONTENTS_LIBDB_NUM) \
+ XTENSA_CPE_SEGMENT(XCHAL_CP0_SA_CONTENTS_LIBDB_NUM) \
+ XTENSA_CPE_SEGMENT(XCHAL_CP1_SA_CONTENTS_LIBDB_NUM) \
+ XTENSA_CPE_SEGMENT(XCHAL_CP2_SA_CONTENTS_LIBDB_NUM) \
+ XTENSA_CPE_SEGMENT(XCHAL_CP3_SA_CONTENTS_LIBDB_NUM) \
+ XTENSA_CPE_SEGMENT(XCHAL_CP4_SA_CONTENTS_LIBDB_NUM) \
+ XTENSA_CPE_SEGMENT(XCHAL_CP5_SA_CONTENTS_LIBDB_NUM) \
+ XTENSA_CPE_SEGMENT(XCHAL_CP6_SA_CONTENTS_LIBDB_NUM) \
+ XTENSA_CPE_SEGMENT(XCHAL_CP7_SA_CONTENTS_LIBDB_NUM) \
+ 1 /* final entry */ \
)
# define XTENSA_CPE_LTABLE_SIZE (XTENSA_CPE_LTABLE_ENTRIES * 8)
#endif
/*
* Instantiations of the elf_fpregset_t type contain, in most
* architectures, the floating point (FPU) register set.
* For Xtensa, this type is extended to contain all custom state,
* ie. coprocessor and "extra" (non-coprocessor) state (including,
* for example, TIE-defined states and register files; as well
* as other optional processor state).
* This includes FPU state if a floating-point coprocessor happens
* to have been configured within the Xtensa processor.
*
* TOTAL_FPREGS_SIZE is the required size (without rounding)
* of elf_fpregset_t. It provides space for the following:
*
* a) 32-bit mask of active coprocessors for this task (similar
* to CPENABLE in single-threaded Xtensa processor systems)
*
* b) table describing the layout of custom states (ie. of
* individual registers, etc) within the save areas
*
* c) save areas for each coprocessor and for non-coprocessor
* ("extra") state
*
* Note that save areas may require up to 16-byte alignment when
* accessed by save/restore sequences. We do not need to ensure
* such alignment in an elf_fpregset_t structure because custom
* state is not directly loaded/stored into it; rather, save area
* contents are copied to elf_fpregset_t from the active save areas
* (see 'struct task_struct' definition in processor.h for that)
* using memcpy(). But we do allow space for such alignment,
* to allow optimizations of layout and copying.
*/
#define TOTAL_FPREGS_SIZE \
(4 + XTENSA_CPE_LTABLE_SIZE + XTENSA_CP_EXTRA_SIZE)
#define ELF_NFPREG \
((TOTAL_FPREGS_SIZE + sizeof(elf_fpreg_t) - 1) / sizeof(elf_fpreg_t))
typedef unsigned int elf_fpreg_t;
typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
#define ELF_CORE_COPY_REGS(_eregs, _pregs) \
xtensa_elf_core_copy_regs (&_eregs, _pregs);
extern void xtensa_elf_core_copy_regs (xtensa_gregset_t *, struct pt_regs *);
/*
* This is used to ensure we don't load something for the wrong architecture.
*/
#define elf_check_arch(x) ( ( (x)->e_machine == EM_XTENSA ) || \
( (x)->e_machine == EM_XTENSA_OLD ) )
/*
* These are used to set parameters in the core dumps.
*/
#ifdef __XTENSA_EL__
# define ELF_DATA ELFDATA2LSB
#elif defined(__XTENSA_EB__)
# define ELF_DATA ELFDATA2MSB
#else
# error processor byte order undefined!
#endif
#define ELF_CLASS ELFCLASS32
#define ELF_ARCH EM_XTENSA
#define USE_ELF_CORE_DUMP
#define ELF_EXEC_PAGESIZE PAGE_SIZE
/*
* 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.
*/
#define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
/*
* This yields a mask that user programs can use to figure out what
* instruction set this CPU supports. This could be done in user space,
* but it's not easy, and we've already done it here.
*/
#define ELF_HWCAP (0)
/*
* 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.
* For the moment, we have only optimizations for the Intel generations,
* but that could change...
*/
#define ELF_PLATFORM (NULL)
/*
* The Xtensa processor ABI says that when the program starts, a2
* contains a pointer to a function which might be registered using
* `atexit'. This provides a mean for the dynamic linker to call
* DT_FINI functions for shared libraries that have been loaded before
* the code runs.
*
* A value of 0 tells we have no such handler.
*
* We might as well make sure everything else is cleared too (except
* for the stack pointer in a1), just to make things more
* deterministic. Also, clearing a0 terminates debugger backtraces.
*/
#define ELF_PLAT_INIT(_r, load_addr) \
do { _r->areg[0]=0; /*_r->areg[1]=0;*/ _r->areg[2]=0; _r->areg[3]=0; \
_r->areg[4]=0; _r->areg[5]=0; _r->areg[6]=0; _r->areg[7]=0; \
_r->areg[8]=0; _r->areg[9]=0; _r->areg[10]=0; _r->areg[11]=0; \
_r->areg[12]=0; _r->areg[13]=0; _r->areg[14]=0; _r->areg[15]=0; \
} while (0)
#ifdef __KERNEL__
#define SET_PERSONALITY(ex, ibcs2) set_personality(PER_LINUX_32BIT)
extern void do_copy_regs (xtensa_gregset_t*, struct pt_regs*,
struct task_struct*);
extern void do_restore_regs (xtensa_gregset_t*, struct pt_regs*,
struct task_struct*);
extern void do_save_fpregs (elf_fpregset_t*, struct pt_regs*,
struct task_struct*);
extern int do_restore_fpregs (elf_fpregset_t*, struct pt_regs*,
struct task_struct*);
#endif /* __KERNEL__ */
#endif /* _XTENSA_ELF_H */
