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 #include <linux/math64.h>
60
61 #define elf_prstatus elf_prstatus32
62 struct elf_prstatus32
63 {
64 struct elf_siginfo pr_info; /* Info associated with signal */
65 short pr_cursig; /* Current signal */
66 unsigned int pr_sigpend; /* Set of pending signals */
67 unsigned int pr_sighold; /* Set of held signals */
68 pid_t pr_pid;
69 pid_t pr_ppid;
70 pid_t pr_pgrp;
71 pid_t pr_sid;
72 struct compat_timeval pr_utime; /* User time */
73 struct compat_timeval pr_stime; /* System time */
74 struct compat_timeval pr_cutime;/* Cumulative user time */
75 struct compat_timeval pr_cstime;/* Cumulative system time */
76 elf_gregset_t pr_reg; /* GP registers */
77 int pr_fpvalid; /* True if math co-processor being used. */
78 };
79
80 #define elf_prpsinfo elf_prpsinfo32
81 struct elf_prpsinfo32
82 {
83 char pr_state; /* numeric process state */
84 char pr_sname; /* char for pr_state */
85 char pr_zomb; /* zombie */
86 char pr_nice; /* nice val */
87 unsigned int pr_flag; /* flags */
88 __kernel_uid_t pr_uid;
89 __kernel_gid_t pr_gid;
90 pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
91 /* Lots missing */
92 char pr_fname[16]; /* filename of executable */
93 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
94 };
95
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
jiffies_to_compat_timeval(unsigned long jiffies,struct compat_timeval * value)101 jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
102 {
103 /*
104 * Convert jiffies to nanoseconds and separate with
105 * one divide.
106 */
107 u64 nsec = (u64)jiffies * TICK_NSEC;
108 u32 rem;
109 value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
110 value->tv_usec = rem / NSEC_PER_USEC;
111 }
112
113 #undef ELF_CORE_COPY_REGS
114 #define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
115
elf32_core_copy_regs(elf_gregset_t grp,struct pt_regs * regs)116 void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
117 {
118 int i;
119
120 for (i = 0; i < EF_R0; i++)
121 grp[i] = 0;
122 grp[EF_R0] = 0;
123 for (i = 1; i <= 31; i++)
124 grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
125 grp[EF_R26] = 0;
126 grp[EF_R27] = 0;
127 grp[EF_LO] = (elf_greg_t) regs->lo;
128 grp[EF_HI] = (elf_greg_t) regs->hi;
129 grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
130 grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
131 grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
132 grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
133 #ifdef EF_UNUSED0
134 grp[EF_UNUSED0] = 0;
135 #endif
136 }
137
138 MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
139 MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
140
141 #undef MODULE_DESCRIPTION
142 #undef MODULE_AUTHOR
143
144 #undef TASK_SIZE
145 #define TASK_SIZE TASK_SIZE32
146
147 #include "../../../fs/binfmt_elf.c"
148