1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Support for n32 Linux/MIPS ELF binaries.
  4 * Author: Ralf Baechle (ralf@linux-mips.org)
  5 *
  6 * Copyright (C) 1999, 2001 Ralf Baechle
  7 * Copyright (C) 1999, 2001 Silicon Graphics, Inc.
  8 *
  9 * Heavily inspired by the 32-bit Sparc compat code which is
 10 * Copyright (C) 1995, 1996, 1997, 1998 David S. Miller (davem@redhat.com)
 11 * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek	(jj@ultra.linux.cz)
 12 */
 13
 14#define ELF_ARCH		EM_MIPS
 15#define ELF_CLASS		ELFCLASS32
 16#ifdef __MIPSEB__
 17#define ELF_DATA		ELFDATA2MSB;
 18#else /* __MIPSEL__ */
 19#define ELF_DATA		ELFDATA2LSB;
 20#endif
 21
 22/* ELF register definitions */
 23#define ELF_NGREG	45
 24#define ELF_NFPREG	33
 25
 26typedef unsigned long elf_greg_t;
 27typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 28
 29typedef double elf_fpreg_t;
 30typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 31
 32/*
 33 * This is used to ensure we don't load something for the wrong architecture.
 34 */
 35#define elf_check_arch elfn32_check_arch
 36
 37#define TASK32_SIZE		0x7fff8000UL
 38#undef ELF_ET_DYN_BASE
 39#define ELF_ET_DYN_BASE		(TASK32_SIZE / 3 * 2)
 40
 41#include <asm/processor.h>
 42#include <linux/elfcore.h>
 43#include <linux/compat.h>
 44#include <linux/math64.h>
 45
 46#define elf_prstatus elf_prstatus32
 47struct elf_prstatus32
 48{
 49	struct elf_siginfo pr_info;	/* Info associated with signal */
 50	short	pr_cursig;		/* Current signal */
 51	unsigned int pr_sigpend;	/* Set of pending signals */
 52	unsigned int pr_sighold;	/* Set of held signals */
 53	pid_t	pr_pid;
 54	pid_t	pr_ppid;
 55	pid_t	pr_pgrp;
 56	pid_t	pr_sid;
 57	struct old_timeval32 pr_utime; /* User time */
 58	struct old_timeval32 pr_stime; /* System time */
 59	struct old_timeval32 pr_cutime;/* Cumulative user time */
 60	struct old_timeval32 pr_cstime;/* Cumulative system time */
 61	elf_gregset_t pr_reg;	/* GP registers */
 62	int pr_fpvalid;		/* True if math co-processor being used.  */
 63};
 64
 65#define elf_prpsinfo elf_prpsinfo32
 66struct elf_prpsinfo32
 67{
 68	char	pr_state;	/* numeric process state */
 69	char	pr_sname;	/* char for pr_state */
 70	char	pr_zomb;	/* zombie */
 71	char	pr_nice;	/* nice val */
 72	unsigned int pr_flag;	/* flags */
 73	__kernel_uid_t	pr_uid;
 74	__kernel_gid_t	pr_gid;
 75	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
 76	/* Lots missing */
 77	char	pr_fname[16];	/* filename of executable */
 78	char	pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
 79};
 80
 81#define elf_caddr_t	u32
 82#define init_elf_binfmt init_elfn32_binfmt
 83
 84#define jiffies_to_timeval jiffies_to_old_timeval32
 85static __inline__ void
 86jiffies_to_old_timeval32(unsigned long jiffies, struct old_timeval32 *value)
 87{
 88	/*
 89	 * Convert jiffies to nanoseconds and separate with
 90	 * one divide.
 91	 */
 92	u64 nsec = (u64)jiffies * TICK_NSEC;
 93	u32 rem;
 94	value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 95	value->tv_usec = rem / NSEC_PER_USEC;
 96}
 97
 98#define ELF_CORE_EFLAGS EF_MIPS_ABI2
 99
100#undef TASK_SIZE
101#define TASK_SIZE TASK_SIZE32
102
103#undef ns_to_kernel_old_timeval
104#define ns_to_kernel_old_timeval ns_to_old_timeval32
105
106#include "../../../fs/binfmt_elf.c"