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 (__h->e_machine != EM_MIPS)					\
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
58#define elf_prstatus elf_prstatus32
59struct elf_prstatus32
60{
61	struct elf_siginfo pr_info;	/* Info associated with signal */
62	short	pr_cursig;		/* Current signal */
63	unsigned int pr_sigpend;	/* Set of pending signals */
64	unsigned int pr_sighold;	/* Set of held signals */
65	pid_t	pr_pid;
66	pid_t	pr_ppid;
67	pid_t	pr_pgrp;
68	pid_t	pr_sid;
69	struct compat_timeval pr_utime;	/* User time */
70	struct compat_timeval pr_stime;	/* System time */
71	struct compat_timeval pr_cutime;/* Cumulative user time */
72	struct compat_timeval pr_cstime;/* Cumulative system time */
73	elf_gregset_t pr_reg;	/* GP registers */
74	int pr_fpvalid;		/* True if math co-processor being used.  */
75};
76
77#define elf_prpsinfo elf_prpsinfo32
78struct elf_prpsinfo32
79{
80	char	pr_state;	/* numeric process state */
81	char	pr_sname;	/* char for pr_state */
82	char	pr_zomb;	/* zombie */
83	char	pr_nice;	/* nice val */
84	unsigned int pr_flag;	/* flags */
85	__kernel_uid_t	pr_uid;
86	__kernel_gid_t	pr_gid;
87	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
88	/* Lots missing */
89	char	pr_fname[16];	/* filename of executable */
90	char	pr_psargs[ELF_PRARGSZ];	/* initial part of arg list */
91};
92
93#define elf_caddr_t	u32
94#define init_elf_binfmt init_elfn32_binfmt
95
96#define jiffies_to_timeval jiffies_to_compat_timeval
97static __inline__ void
98jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
99{
100	/*
101	 * Convert jiffies to nanoseconds and seperate with
102	 * one divide.
103	 */
104	u64 nsec = (u64)jiffies * TICK_NSEC;
105	long rem;
106	value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &rem);
107	value->tv_usec = rem / NSEC_PER_USEC;
108}
109
110#define ELF_CORE_EFLAGS EF_MIPS_ABI2
111
112MODULE_DESCRIPTION("Binary format loader for compatibility with n32 Linux/MIPS binaries");
113MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
114
115#undef MODULE_DESCRIPTION
116#undef MODULE_AUTHOR
117
118#undef TASK_SIZE
119#define TASK_SIZE TASK_SIZE32
120
121#include "../../../fs/binfmt_elf.c"
122