Merge tag 'v3.10.55' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / 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 #ifdef CONFIG_KVM_GUEST
52 #define TASK32_SIZE 0x3fff8000UL
53 #else
54 #define TASK32_SIZE 0x7fff8000UL
55 #endif
56 #undef ELF_ET_DYN_BASE
57 #define ELF_ET_DYN_BASE (TASK32_SIZE / 3 * 2)
58
59 #include <asm/processor.h>
60
61 /* These MUST be defined before elf.h gets included */
62 extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
63 #define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
64 #define ELF_CORE_COPY_TASK_REGS(_tsk, _dest) \
65 ({ \
66 int __res = 1; \
67 elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk)); \
68 __res; \
69 })
70
71 #include <linux/module.h>
72 #include <linux/elfcore.h>
73 #include <linux/compat.h>
74 #include <linux/math64.h>
75
76 #define elf_prstatus elf_prstatus32
77 struct elf_prstatus32
78 {
79 struct elf_siginfo pr_info; /* Info associated with signal */
80 short pr_cursig; /* Current signal */
81 unsigned int pr_sigpend; /* Set of pending signals */
82 unsigned int pr_sighold; /* Set of held signals */
83 pid_t pr_pid;
84 pid_t pr_ppid;
85 pid_t pr_pgrp;
86 pid_t pr_sid;
87 struct compat_timeval pr_utime; /* User time */
88 struct compat_timeval pr_stime; /* System time */
89 struct compat_timeval pr_cutime;/* Cumulative user time */
90 struct compat_timeval pr_cstime;/* Cumulative system time */
91 elf_gregset_t pr_reg; /* GP registers */
92 int pr_fpvalid; /* True if math co-processor being used. */
93 };
94
95 #define elf_prpsinfo elf_prpsinfo32
96 struct elf_prpsinfo32
97 {
98 char pr_state; /* numeric process state */
99 char pr_sname; /* char for pr_state */
100 char pr_zomb; /* zombie */
101 char pr_nice; /* nice val */
102 unsigned int pr_flag; /* flags */
103 __kernel_uid_t pr_uid;
104 __kernel_gid_t pr_gid;
105 pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
106 /* Lots missing */
107 char pr_fname[16]; /* filename of executable */
108 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
109 };
110
111 #define elf_caddr_t u32
112 #define init_elf_binfmt init_elf32_binfmt
113
114 #define jiffies_to_timeval jiffies_to_compat_timeval
115 static inline void
116 jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
117 {
118 /*
119 * Convert jiffies to nanoseconds and separate with
120 * one divide.
121 */
122 u64 nsec = (u64)jiffies * TICK_NSEC;
123 u32 rem;
124 value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
125 value->tv_usec = rem / NSEC_PER_USEC;
126 }
127
128 void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
129 {
130 int i;
131
132 for (i = 0; i < MIPS32_EF_R0; i++)
133 grp[i] = 0;
134 grp[MIPS32_EF_R0] = 0;
135 for (i = 1; i <= 31; i++)
136 grp[MIPS32_EF_R0 + i] = (elf_greg_t) regs->regs[i];
137 grp[MIPS32_EF_R26] = 0;
138 grp[MIPS32_EF_R27] = 0;
139 grp[MIPS32_EF_LO] = (elf_greg_t) regs->lo;
140 grp[MIPS32_EF_HI] = (elf_greg_t) regs->hi;
141 grp[MIPS32_EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
142 grp[MIPS32_EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
143 grp[MIPS32_EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
144 grp[MIPS32_EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
145 #ifdef MIPS32_EF_UNUSED0
146 grp[MIPS32_EF_UNUSED0] = 0;
147 #endif
148 }
149
150 MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
151 MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
152
153 #undef MODULE_DESCRIPTION
154 #undef MODULE_AUTHOR
155
156 #undef TASK_SIZE
157 #define TASK_SIZE TASK_SIZE32
158
159 #undef cputime_to_timeval
160 #define cputime_to_timeval cputime_to_compat_timeval
161 static __inline__ void
162 cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
163 {
164 unsigned long jiffies = cputime_to_jiffies(cputime);
165
166 value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
167 value->tv_sec = jiffies / HZ;
168 }
169
170 #include "../../../fs/binfmt_elf.c"