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 * 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		__res = 0;						\
44	if (((__h->e_flags & EF_MIPS_ABI) != 0) &&			\
45	    ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))		\
46		__res = 0;						\
47									\
48	__res;								\
49})
50
51#define TASK32_SIZE		0x7fff8000UL
52#undef ELF_ET_DYN_BASE
53#define ELF_ET_DYN_BASE         (TASK32_SIZE / 3 * 2)
54
55#include <asm/processor.h>
56#include <linux/module.h>
57#include <linux/elfcore.h>
58#include <linux/compat.h>
59
60#define elf_prstatus elf_prstatus32
61struct elf_prstatus32
62{
63	struct elf_siginfo pr_info;	/* Info associated with signal */
64	short	pr_cursig;		/* Current signal */
65	unsigned int pr_sigpend;	/* Set of pending signals */
66	unsigned int pr_sighold;	/* Set of held signals */
67	pid_t	pr_pid;
68	pid_t	pr_ppid;
69	pid_t	pr_pgrp;
70	pid_t	pr_sid;
71	struct compat_timeval pr_utime;	/* User time */
72	struct compat_timeval pr_stime;	/* System time */
73	struct compat_timeval pr_cutime;/* Cumulative user time */
74	struct compat_timeval pr_cstime;/* Cumulative system time */
75	elf_gregset_t pr_reg;	/* GP registers */
76	int pr_fpvalid;		/* True if math co-processor being used.  */
77};
78
79#define elf_prpsinfo elf_prpsinfo32
80struct elf_prpsinfo32
81{
82	char	pr_state;	/* numeric process state */
83	char	pr_sname;	/* char for pr_state */
84	char	pr_zomb;	/* zombie */
85	char	pr_nice;	/* nice val */
86	unsigned int pr_flag;	/* flags */
87	__kernel_uid_t	pr_uid;
88	__kernel_gid_t	pr_gid;
89	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
90	/* Lots missing */
91	char	pr_fname[16];	/* filename of executable */
92	char	pr_psargs[ELF_PRARGSZ];	/* initial part of arg list */
93};
94
95#define elf_caddr_t	u32
96#define init_elf_binfmt init_elf32_binfmt
97
98#define jiffies_to_timeval jiffies_to_compat_timeval
99static inline void
100jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
101{
102	/*
103	 * Convert jiffies to nanoseconds and seperate with
104	 * one divide.
105	 */
106	u64 nsec = (u64)jiffies * TICK_NSEC;
107	long rem;
108	value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &rem);
109	value->tv_usec = rem / NSEC_PER_USEC;
110}
111
112#undef ELF_CORE_COPY_REGS
113#define ELF_CORE_COPY_REGS(_dest,_regs) elf32_core_copy_regs(_dest,_regs);
114
115void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
116{
117	int i;
118
119	for (i = 0; i < EF_R0; i++)
120		grp[i] = 0;
121	grp[EF_R0] = 0;
122	for (i = 1; i <= 31; i++)
123		grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
124	grp[EF_R26] = 0;
125	grp[EF_R27] = 0;
126	grp[EF_LO] = (elf_greg_t) regs->lo;
127	grp[EF_HI] = (elf_greg_t) regs->hi;
128	grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
129	grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
130	grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
131	grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
132#ifdef EF_UNUSED0
133	grp[EF_UNUSED0] = 0;
134#endif
135}
136
137MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
138MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
139
140#undef MODULE_DESCRIPTION
141#undef MODULE_AUTHOR
142
143#undef TASK_SIZE
144#define TASK_SIZE TASK_SIZE32
145
146#include "../../../fs/binfmt_elf.c"
147