blob: 202e581e609653ea3f2b651cb2387ba9e04fe65e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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)
Ralf Baechle70342282013-01-22 12:59:30 +01009 * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek (jj@ultra.linux.cz)
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
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
Sanjay Lal9843b032012-11-21 18:34:03 -080051#ifdef CONFIG_KVM_GUEST
52#define TASK32_SIZE 0x3fff8000UL
53#else
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#define TASK32_SIZE 0x7fff8000UL
Sanjay Lal9843b032012-11-21 18:34:03 -080055#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#undef ELF_ET_DYN_BASE
Ralf Baechle70342282013-01-22 12:59:30 +010057#define ELF_ET_DYN_BASE (TASK32_SIZE / 3 * 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59#include <asm/processor.h>
Yong Zhangcad9bc62009-07-01 09:35:39 +080060
61/*
62 * When this file is selected, we are definitely running a 64bit kernel.
63 * So using the right regs define in asm/reg.h
64 */
65#define WANT_COMPAT_REG_H
66
67/* These MUST be defined before elf.h gets included */
68extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
69#define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
70#define ELF_CORE_COPY_TASK_REGS(_tsk, _dest) \
71({ \
72 int __res = 1; \
73 elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk)); \
74 __res; \
75})
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070078#include <linux/elfcore.h>
79#include <linux/compat.h>
Roman Zippelf8bd2252008-05-01 04:34:31 -070080#include <linux/math64.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82#define elf_prstatus elf_prstatus32
83struct elf_prstatus32
84{
85 struct elf_siginfo pr_info; /* Info associated with signal */
86 short pr_cursig; /* Current signal */
87 unsigned int pr_sigpend; /* Set of pending signals */
88 unsigned int pr_sighold; /* Set of held signals */
89 pid_t pr_pid;
90 pid_t pr_ppid;
91 pid_t pr_pgrp;
92 pid_t pr_sid;
Ralf Baechle70342282013-01-22 12:59:30 +010093 struct compat_timeval pr_utime; /* User time */
94 struct compat_timeval pr_stime; /* System time */
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 struct compat_timeval pr_cutime;/* Cumulative user time */
96 struct compat_timeval pr_cstime;/* Cumulative system time */
97 elf_gregset_t pr_reg; /* GP registers */
98 int pr_fpvalid; /* True if math co-processor being used. */
99};
100
101#define elf_prpsinfo elf_prpsinfo32
102struct elf_prpsinfo32
103{
104 char pr_state; /* numeric process state */
105 char pr_sname; /* char for pr_state */
106 char pr_zomb; /* zombie */
107 char pr_nice; /* nice val */
108 unsigned int pr_flag; /* flags */
109 __kernel_uid_t pr_uid;
110 __kernel_gid_t pr_gid;
111 pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
112 /* Lots missing */
113 char pr_fname[16]; /* filename of executable */
Ralf Baechle70342282013-01-22 12:59:30 +0100114 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115};
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#define elf_caddr_t u32
118#define init_elf_binfmt init_elf32_binfmt
119
120#define jiffies_to_timeval jiffies_to_compat_timeval
Ralf Baechleb053c982005-01-26 02:21:06 +0000121static inline void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
123{
124 /*
Joe Perches603e82e2008-02-03 16:54:53 +0200125 * Convert jiffies to nanoseconds and separate with
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 * one divide.
127 */
Ralf Baechle42a3b4f22005-09-03 15:56:17 -0700128 u64 nsec = (u64)jiffies * TICK_NSEC;
Roman Zippelf8bd2252008-05-01 04:34:31 -0700129 u32 rem;
130 value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
Atsushi Nemoto909fa642006-02-21 01:25:06 +0900131 value->tv_usec = rem / NSEC_PER_USEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132}
133
Ralf Baechleb053c982005-01-26 02:21:06 +0000134void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
136 int i;
137
Ralf Baechleb053c982005-01-26 02:21:06 +0000138 for (i = 0; i < EF_R0; i++)
139 grp[i] = 0;
140 grp[EF_R0] = 0;
141 for (i = 1; i <= 31; i++)
142 grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
143 grp[EF_R26] = 0;
144 grp[EF_R27] = 0;
145 grp[EF_LO] = (elf_greg_t) regs->lo;
146 grp[EF_HI] = (elf_greg_t) regs->hi;
147 grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
148 grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
149 grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
150 grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
151#ifdef EF_UNUSED0
152 grp[EF_UNUSED0] = 0;
153#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154}
155
156MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
157MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
158
159#undef MODULE_DESCRIPTION
160#undef MODULE_AUTHOR
161
Ralf Baechlec6237642005-01-26 02:22:22 +0000162#undef TASK_SIZE
163#define TASK_SIZE TASK_SIZE32
164
Ralf Baechle7b741aa2013-05-29 00:48:10 +0200165#undef cputime_to_timeval
166#define cputime_to_timeval cputime_to_compat_timeval
167static __inline__ void
168cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
169{
170 unsigned long jiffies = cputime_to_jiffies(cputime);
171
172 value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
173 value->tv_sec = jiffies / HZ;
174}
175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176#include "../../../fs/binfmt_elf.c"