alistair23-linux/arch/alpha/include/asm/elf.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_ALPHA_ELF_H
#define __ASM_ALPHA_ELF_H

#include <asm/auxvec.h>
#include <asm/special_insns.h>

/* Special values for the st_other field in the symbol table.  */

#define STO_ALPHA_NOPV		0x80
#define STO_ALPHA_STD_GPLOAD	0x88

/*
 * Alpha ELF relocation types
 */
#define R_ALPHA_NONE            0       /* No reloc */
#define R_ALPHA_REFLONG         1       /* Direct 32 bit */
#define R_ALPHA_REFQUAD         2       /* Direct 64 bit */
#define R_ALPHA_GPREL32         3       /* GP relative 32 bit */
#define R_ALPHA_LITERAL         4       /* GP relative 16 bit w/optimization */
#define R_ALPHA_LITUSE          5       /* Optimization hint for LITERAL */
#define R_ALPHA_GPDISP          6       /* Add displacement to GP */
#define R_ALPHA_BRADDR          7       /* PC+4 relative 23 bit shifted */
#define R_ALPHA_HINT            8       /* PC+4 relative 16 bit shifted */
#define R_ALPHA_SREL16          9       /* PC relative 16 bit */
#define R_ALPHA_SREL32          10      /* PC relative 32 bit */
#define R_ALPHA_SREL64          11      /* PC relative 64 bit */
#define R_ALPHA_GPRELHIGH       17      /* GP relative 32 bit, high 16 bits */
#define R_ALPHA_GPRELLOW        18      /* GP relative 32 bit, low 16 bits */
#define R_ALPHA_GPREL16         19      /* GP relative 16 bit */
#define R_ALPHA_COPY            24      /* Copy symbol at runtime */
#define R_ALPHA_GLOB_DAT        25      /* Create GOT entry */
#define R_ALPHA_JMP_SLOT        26      /* Create PLT entry */
#define R_ALPHA_RELATIVE        27      /* Adjust by program base */
#define R_ALPHA_BRSGP		28
#define R_ALPHA_TLSGD           29
#define R_ALPHA_TLS_LDM         30
#define R_ALPHA_DTPMOD64        31
#define R_ALPHA_GOTDTPREL       32
#define R_ALPHA_DTPREL64        33
#define R_ALPHA_DTPRELHI        34
#define R_ALPHA_DTPRELLO        35
#define R_ALPHA_DTPREL16        36
#define R_ALPHA_GOTTPREL        37
#define R_ALPHA_TPREL64         38
#define R_ALPHA_TPRELHI         39
#define R_ALPHA_TPRELLO         40
#define R_ALPHA_TPREL16         41

#define SHF_ALPHA_GPREL		0x10000000

/* Legal values for e_flags field of Elf64_Ehdr.  */

#define EF_ALPHA_32BIT		1	/* All addresses are below 2GB */

/*
 * ELF register definitions..
 */

/*
 * The OSF/1 version of <sys/procfs.h> makes gregset_t 46 entries long.
 * I have no idea why that is so.  For now, we just leave it at 33
 * (32 general regs + processor status word). 
 */
#define ELF_NGREG	33
#define ELF_NFPREG	32

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];

/*
 * This is used to ensure we don't load something for the wrong architecture.
 */
#define elf_check_arch(x) ((x)->e_machine == EM_ALPHA)

/*
 * These are used to set parameters in the core dumps.
 */
#define ELF_CLASS	ELFCLASS64
#define ELF_DATA	ELFDATA2LSB
#define ELF_ARCH	EM_ALPHA

#define ELF_EXEC_PAGESIZE	8192

/* 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		(TASK_UNMAPPED_BASE + 0x1000000)

/* $0 is set by ld.so to 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.

   So that we can use the same startup file with static executables,
   we start programs with a value of 0 to indicate that there is no
   such function.  */

#define ELF_PLAT_INIT(_r, load_addr)	_r->r0 = 0

/* The registers are laid out in pt_regs for PAL and syscall
   convenience.  Re-order them for the linear elf_gregset_t.  */

struct pt_regs;
struct thread_info;
struct task_struct;
extern void dump_elf_thread(elf_greg_t *dest, struct pt_regs *pt,
			    struct thread_info *ti);
#define ELF_CORE_COPY_REGS(DEST, REGS) \
	dump_elf_thread(DEST, REGS, current_thread_info());

/* Similar, but for a thread other than current.  */

extern int dump_elf_task(elf_greg_t *dest, struct task_struct *task);
#define ELF_CORE_COPY_TASK_REGS(TASK, DEST) \
	dump_elf_task(*(DEST), TASK)

/* Similar, but for the FP registers.  */

extern int dump_elf_task_fp(elf_fpreg_t *dest, struct task_struct *task);
#define ELF_CORE_COPY_FPREGS(TASK, DEST) \
	dump_elf_task_fp(*(DEST), TASK)

/* This yields a mask that user programs can use to figure out what
   instruction set this CPU supports.  This is trivial on Alpha, 
   but not so on other machines. */

#define ELF_HWCAP  (~amask(-1))

/* 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				\
({						\
	enum implver_enum i_ = implver();	\
	( i_ == IMPLVER_EV4 ? "ev4"		\
	: i_ == IMPLVER_EV5			\
	  ? (amask(AMASK_BWX) ? "ev5" : "ev56")	\
	: amask (AMASK_CIX) ? "ev6" : "ev67");	\
})

#define SET_PERSONALITY(EX)					\
	set_personality(((EX).e_flags & EF_ALPHA_32BIT)		\
	   ? PER_LINUX_32BIT : PER_LINUX)

extern int alpha_l1i_cacheshape;
extern int alpha_l1d_cacheshape;
extern int alpha_l2_cacheshape;
extern int alpha_l3_cacheshape;

/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
#define ARCH_DLINFO						\
  do {								\
    NEW_AUX_ENT(AT_L1I_CACHESHAPE, alpha_l1i_cacheshape);	\
    NEW_AUX_ENT(AT_L1D_CACHESHAPE, alpha_l1d_cacheshape);	\
    NEW_AUX_ENT(AT_L2_CACHESHAPE, alpha_l2_cacheshape);		\
    NEW_AUX_ENT(AT_L3_CACHESHAPE, alpha_l3_cacheshape);		\
  } while (0)

#endif /* __ASM_ALPHA_ELF_H */