1/*
  2 * Support for n32 Linux/MIPS ELF binaries.
  3 *
  4 * Copyright (C) 1999, 2001 Ralf Baechle
  5 * Copyright (C) 1999, 2001 Silicon Graphics, Inc.
  6 *
  7 * Heavily inspired by the 32-bit Sparc compat code which is
  8 * Copyright (C) 1995, 1996, 1997, 1998 David S. Miller (davem@redhat.com)
  9 * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek	(jj@ultra.linux.cz)
 10 */
 11
 12#define ELF_ARCH		EM_MIPS
 13#define ELF_CLASS		ELFCLASS32
 14#ifdef __MIPSEB__
 15#define ELF_DATA		ELFDATA2MSB;
 16#else /* __MIPSEL__ */
 17#define ELF_DATA		ELFDATA2LSB;
 18#endif
 19
 20/* ELF register definitions */
 21#define ELF_NGREG	45
 22#define ELF_NFPREG	33
 23
 24typedef unsigned long elf_greg_t;
 25typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 26
 27typedef double elf_fpreg_t;
 28typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 29
 30/*
 31 * This is used to ensure we don't load something for the wrong architecture.
 32 */
 33#define elf_check_arch(hdr)						\
 34({									\
 35	int __res = 1;							\
 36	struct elfhdr *__h = (hdr);					\
 37									\
 38	if (!mips_elf_check_machine(__h))				\
 39		__res = 0;						\
 40	if (__h->e_ident[EI_CLASS] != ELFCLASS32)			\
 41		__res = 0;						\
 42	if (((__h->e_flags & EF_MIPS_ABI2) == 0) ||			\
 43	    ((__h->e_flags & EF_MIPS_ABI) != 0))			\
 44		__res = 0;						\
 45									\
 46	__res;								\
 47})
 48
 49#define TASK32_SIZE		0x7fff8000UL
 50#undef ELF_ET_DYN_BASE
 51#define ELF_ET_DYN_BASE		(TASK32_SIZE / 3 * 2)
 52
 53#include <asm/processor.h>
 54#include <linux/module.h>
 55#include <linux/elfcore.h>
 56#include <linux/compat.h>
 57#include <linux/math64.h>
 58
 59#define elf_prstatus elf_prstatus32
 60struct elf_prstatus32
 61{
 62	struct elf_siginfo pr_info;	/* Info associated with signal */
 63	short	pr_cursig;		/* Current signal */
 64	unsigned int pr_sigpend;	/* Set of pending signals */
 65	unsigned int pr_sighold;	/* Set of held signals */
 66	pid_t	pr_pid;
 67	pid_t	pr_ppid;
 68	pid_t	pr_pgrp;
 69	pid_t	pr_sid;
 70	struct compat_timeval pr_utime; /* User time */
 71	struct compat_timeval pr_stime; /* System time */
 72	struct compat_timeval pr_cutime;/* Cumulative user time */
 73	struct compat_timeval pr_cstime;/* Cumulative system time */
 74	elf_gregset_t pr_reg;	/* GP registers */
 75	int pr_fpvalid;		/* True if math co-processor being used.  */
 76};
 77
 78#define elf_prpsinfo elf_prpsinfo32
 79struct elf_prpsinfo32
 80{
 81	char	pr_state;	/* numeric process state */
 82	char	pr_sname;	/* char for pr_state */
 83	char	pr_zomb;	/* zombie */
 84	char	pr_nice;	/* nice val */
 85	unsigned int pr_flag;	/* flags */
 86	__kernel_uid_t	pr_uid;
 87	__kernel_gid_t	pr_gid;
 88	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
 89	/* Lots missing */
 90	char	pr_fname[16];	/* filename of executable */
 91	char	pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
 92};
 93
 94#define elf_caddr_t	u32
 95#define init_elf_binfmt init_elfn32_binfmt
 96
 97#define jiffies_to_timeval jiffies_to_compat_timeval
 98static __inline__ void
 99jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
100{
101	/*
102	 * Convert jiffies to nanoseconds and separate with
103	 * one divide.
104	 */
105	u64 nsec = (u64)jiffies * TICK_NSEC;
106	u32 rem;
107	value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
108	value->tv_usec = rem / NSEC_PER_USEC;
109}
110
111#define ELF_CORE_EFLAGS EF_MIPS_ABI2
112
113MODULE_DESCRIPTION("Binary format loader for compatibility with n32 Linux/MIPS binaries");
114MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
115
116#undef MODULE_DESCRIPTION
117#undef MODULE_AUTHOR
118
119#undef TASK_SIZE
120#define TASK_SIZE TASK_SIZE32
121
122#undef cputime_to_timeval
123#define cputime_to_timeval cputime_to_compat_timeval
124static __inline__ void
125cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
126{
127	unsigned long jiffies = cputime_to_jiffies(cputime);
128
129	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
130	value->tv_sec = jiffies / HZ;
131}
132
133#include "../../../fs/binfmt_elf.c"