xref: /kernel/linux/linux-6.6/arch/m68k/include/asm/elf.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASMm68k_ELF_H
#define __ASMm68k_ELF_H

/*
 * ELF register definitions..
 */

#include <asm/ptrace.h>
#include <asm/user.h>

/*
 * 68k ELF relocation types
 */
#define R_68K_NONE	0
#define R_68K_32	1
#define R_68K_16	2
#define R_68K_8		3
#define R_68K_PC32	4
#define R_68K_PC16	5
#define R_68K_PC8	6
#define R_68K_GOT32	7
#define R_68K_GOT16	8
#define R_68K_GOT8	9
#define R_68K_GOT32O	10
#define R_68K_GOT16O	11
#define R_68K_GOT8O	12
#define R_68K_PLT32	13
#define R_68K_PLT16	14
#define R_68K_PLT8	15
#define R_68K_PLT32O	16
#define R_68K_PLT16O	17
#define R_68K_PLT8O	18
#define R_68K_COPY	19
#define R_68K_GLOB_DAT	20
#define R_68K_JMP_SLOT	21
#define R_68K_RELATIVE	22

typedef unsigned long elf_greg_t;

#define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
typedef elf_greg_t elf_gregset_t[ELF_NGREG];

typedef struct user_m68kfp_struct elf_fpregset_t;

/*
 * This is used to ensure we don't load something for the wrong architecture.
 */
#define elf_check_arch(x) ((x)->e_machine == EM_68K)

/*
 * These are used to set parameters in the core dumps.
 */
#define ELF_CLASS	ELFCLASS32
#define ELF_DATA	ELFDATA2MSB
#define ELF_ARCH	EM_68K

/* For SVR4/m68k the function pointer to be registered with `atexit' is
   passed in %a1.  Although my copy of the ABI has no such statement, it
   is actually used on ASV.  */
#define ELF_PLAT_INIT(_r, load_addr)	_r->a1 = 0

#define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, dynamic_addr) \
        do { \
                (_r)->d3 = _exec_map_addr; \
                (_r)->d4 = _interp_map_addr; \
                (_r)->d5 = dynamic_addr; \
        } while(0)

#if defined(CONFIG_SUN3) || defined(CONFIG_COLDFIRE)
#define ELF_EXEC_PAGESIZE	8192
#else
#define ELF_EXEC_PAGESIZE	4096
#endif

/* 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 CONFIG_SUN3
#define ELF_ET_DYN_BASE         0xD0000000UL
#else
#define ELF_ET_DYN_BASE         0x0D800000UL
#endif

#define ELF_CORE_COPY_REGS(pr_reg, regs)				\
	/* Bleech. */							\
	pr_reg[0] = regs->d1;						\
	pr_reg[1] = regs->d2;						\
	pr_reg[2] = regs->d3;						\
	pr_reg[3] = regs->d4;						\
	pr_reg[4] = regs->d5;						\
	pr_reg[7] = regs->a0;						\
	pr_reg[8] = regs->a1;						\
	pr_reg[9] = regs->a2;						\
	pr_reg[14] = regs->d0;						\
	pr_reg[15] = rdusp();						\
	pr_reg[16] = regs->orig_d0;					\
	pr_reg[17] = regs->sr;						\
	pr_reg[18] = regs->pc;						\
	pr_reg[19] = (regs->format << 12) | regs->vector;		\
	{								\
	  struct switch_stack *sw = ((struct switch_stack *)regs) - 1;	\
	  pr_reg[5] = sw->d6;						\
	  pr_reg[6] = sw->d7;						\
	  pr_reg[10] = sw->a3;						\
	  pr_reg[11] = sw->a4;						\
	  pr_reg[12] = sw->a5;						\
	  pr_reg[13] = sw->a6;						\
	}

/* This yields a mask that user programs can use to figure out what
   instruction set this cpu supports.  */

#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.  */

#define ELF_PLATFORM  (NULL)

#define ELF_FDPIC_CORE_EFLAGS  0

#endif