1/*
  2 * Support for o32 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 int 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 * In order to be sure that we don't attempt to execute an O32 binary which
 32 * requires 64 bit FP (FR=1) on a system which does not support it we refuse
 33 * to execute any binary which has bits specified by the following macro set
 34 * in its ELF header flags.
 35 */
 36#ifdef CONFIG_MIPS_O32_FP64_SUPPORT
 37# define __MIPS_O32_FP64_MUST_BE_ZERO	0
 38#else
 39# define __MIPS_O32_FP64_MUST_BE_ZERO	EF_MIPS_FP64
 40#endif
 41
 42/*
 43 * This is used to ensure we don't load something for the wrong architecture.
 44 */
 45#define elf_check_arch(hdr)						\
 46({									\
 47	int __res = 1;							\
 48	struct elfhdr *__h = (hdr);					\
 49									\
 50	if (!mips_elf_check_machine(__h))				\
 51		__res = 0;						\
 52	if (__h->e_ident[EI_CLASS] != ELFCLASS32)			\
 53		__res = 0;						\
 54	if ((__h->e_flags & EF_MIPS_ABI2) != 0)				\
 55		__res = 0;						\
 56	if (((__h->e_flags & EF_MIPS_ABI) != 0) &&			\
 57	    ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))		\
 58		__res = 0;						\
 59	if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO)		\
 60		__res = 0;						\
 61									\
 62	__res;								\
 63})
 64
 65#ifdef CONFIG_KVM_GUEST
 66#define TASK32_SIZE		0x3fff8000UL
 67#else
 68#define TASK32_SIZE		0x7fff8000UL
 69#endif
 70#undef ELF_ET_DYN_BASE
 71#define ELF_ET_DYN_BASE		(TASK32_SIZE / 3 * 2)
 72
 73#include <asm/processor.h>
 74
 75#include <linux/module.h>
 76#include <linux/elfcore.h>
 77#include <linux/compat.h>
 78#include <linux/math64.h>
 79
 80#define elf_prstatus elf_prstatus32
 81struct elf_prstatus32
 82{
 83	struct elf_siginfo pr_info;	/* Info associated with signal */
 84	short	pr_cursig;		/* Current signal */
 85	unsigned int pr_sigpend;	/* Set of pending signals */
 86	unsigned int pr_sighold;	/* Set of held signals */
 87	pid_t	pr_pid;
 88	pid_t	pr_ppid;
 89	pid_t	pr_pgrp;
 90	pid_t	pr_sid;
 91	struct compat_timeval pr_utime; /* User time */
 92	struct compat_timeval pr_stime; /* System time */
 93	struct compat_timeval pr_cutime;/* Cumulative user time */
 94	struct compat_timeval pr_cstime;/* Cumulative system time */
 95	elf_gregset_t pr_reg;	/* GP registers */
 96	int pr_fpvalid;		/* True if math co-processor being used.  */
 97};
 98
 99#define elf_prpsinfo elf_prpsinfo32
100struct elf_prpsinfo32
101{
102	char	pr_state;	/* numeric process state */
103	char	pr_sname;	/* char for pr_state */
104	char	pr_zomb;	/* zombie */
105	char	pr_nice;	/* nice val */
106	unsigned int pr_flag;	/* flags */
107	__kernel_uid_t	pr_uid;
108	__kernel_gid_t	pr_gid;
109	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
110	/* Lots missing */
111	char	pr_fname[16];	/* filename of executable */
112	char	pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
113};
114
115#define elf_caddr_t	u32
116#define init_elf_binfmt init_elf32_binfmt
117
118#define jiffies_to_timeval jiffies_to_compat_timeval
119static inline void
120jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
121{
122	/*
123	 * Convert jiffies to nanoseconds and separate with
124	 * one divide.
125	 */
126	u64 nsec = (u64)jiffies * TICK_NSEC;
127	u32 rem;
128	value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
129	value->tv_usec = rem / NSEC_PER_USEC;
130}
131
132MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
133MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
134
135#undef MODULE_DESCRIPTION
136#undef MODULE_AUTHOR
137
138#undef TASK_SIZE
139#define TASK_SIZE TASK_SIZE32
140
141#undef cputime_to_timeval
142#define cputime_to_timeval cputime_to_compat_timeval
143static __inline__ void
144cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
145{
146	unsigned long jiffies = cputime_to_jiffies(cputime);
147
148	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
149	value->tv_sec = jiffies / HZ;
150}
151
152#include "../../../fs/binfmt_elf.c"