1 /*
2 * Support for o32 Linux/MIPS ELF binaries.
3 * Author: Ralf Baechle (ralf@linux-mips.org)
4 *
5 * Copyright (C) 1999, 2001 Ralf Baechle
6 * Copyright (C) 1999, 2001 Silicon Graphics, Inc.
7 *
8 * Heavily inspired by the 32-bit Sparc compat code which is
9 * Copyright (C) 1995, 1996, 1997, 1998 David S. Miller (davem@redhat.com)
10 * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek (jj@ultra.linux.cz)
11 */
12
13 #define ELF_ARCH EM_MIPS
14 #define ELF_CLASS ELFCLASS32
15 #ifdef __MIPSEB__
16 #define ELF_DATA ELFDATA2MSB;
17 #else /* __MIPSEL__ */
18 #define ELF_DATA ELFDATA2LSB;
19 #endif
20
21 /* ELF register definitions */
22 #define ELF_NGREG 45
23 #define ELF_NFPREG 33
24
25 typedef unsigned int elf_greg_t;
26 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
27
28 typedef double elf_fpreg_t;
29 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
30
31 /*
32 * In order to be sure that we don't attempt to execute an O32 binary which
33 * requires 64 bit FP (FR=1) on a system which does not support it we refuse
34 * to execute any binary which has bits specified by the following macro set
35 * in its ELF header flags.
36 */
37 #ifdef CONFIG_MIPS_O32_FP64_SUPPORT
38 # define __MIPS_O32_FP64_MUST_BE_ZERO 0
39 #else
40 # define __MIPS_O32_FP64_MUST_BE_ZERO EF_MIPS_FP64
41 #endif
42
43 /*
44 * This is used to ensure we don't load something for the wrong architecture.
45 */
46 #define elf_check_arch(hdr) \
47 ({ \
48 int __res = 1; \
49 struct elfhdr *__h = (hdr); \
50 \
51 if (__h->e_machine != EM_MIPS) \
52 __res = 0; \
53 if (__h->e_ident[EI_CLASS] != ELFCLASS32) \
54 __res = 0; \
55 if ((__h->e_flags & EF_MIPS_ABI2) != 0) \
56 __res = 0; \
57 if (((__h->e_flags & EF_MIPS_ABI) != 0) && \
58 ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32)) \
59 __res = 0; \
60 if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO) \
61 __res = 0; \
62 \
63 __res; \
64 })
65
66 #ifdef CONFIG_KVM_GUEST
67 #define TASK32_SIZE 0x3fff8000UL
68 #else
69 #define TASK32_SIZE 0x7fff8000UL
70 #endif
71 #undef ELF_ET_DYN_BASE
72 #define ELF_ET_DYN_BASE (TASK32_SIZE / 3 * 2)
73
74 #include <asm/processor.h>
75
76 #include <linux/elfcore.h>
77 #include <linux/compat.h>
78 #include <linux/math64.h>
79
80 #define elf_prstatus elf_prstatus32
81 struct 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
100 struct 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
119 static inline void
jiffies_to_compat_timeval(unsigned long jiffies,struct compat_timeval * value)120 jiffies_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
132 #undef TASK_SIZE
133 #define TASK_SIZE TASK_SIZE32
134
135 #undef cputime_to_timeval
136 #define cputime_to_timeval cputime_to_compat_timeval
137 static __inline__ void
cputime_to_compat_timeval(const cputime_t cputime,struct compat_timeval * value)138 cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
139 {
140 unsigned long jiffies = cputime_to_jiffies(cputime);
141
142 value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
143 value->tv_sec = jiffies / HZ;
144 }
145
146 #include "../../../fs/binfmt_elf.c"
147