[MIPS] N32: Make sure pointer is good before passing it to sys_waitid().
[linux-2.6] / arch / mips / kernel / binfmt_elfo32.c
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
24 typedef unsigned int elf_greg_t;
25 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
26
27 typedef double elf_fpreg_t;
28 typedef 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
61 struct 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
80 struct 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_addr_t      u32
96 #define elf_caddr_t     u32
97 #define init_elf_binfmt init_elf32_binfmt
98
99 #define jiffies_to_timeval jiffies_to_compat_timeval
100 static inline void
101 jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
102 {
103         /*
104          * Convert jiffies to nanoseconds and seperate with
105          * one divide.
106          */
107         u64 nsec = (u64)jiffies * TICK_NSEC;
108         value->tv_sec = div_long_long_rem(nsec, NSEC_PER_SEC, &value->tv_usec);
109         value->tv_usec /= 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
115 void 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
137 MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
138 MODULE_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"