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
 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 * In order to be sure that we don't attempt to execute an O32 binary which
 32 * requires 64 bit FP (FR=1) on a system which does not support it we refuse
 33 * to execute any binary which has bits specified by the following macro set
 34 * in its ELF header flags.
 35 */
 36#ifdef CONFIG_MIPS_O32_FP64_SUPPORT
 37# define __MIPS_O32_FP64_MUST_BE_ZERO	0
 38#else
 39# define __MIPS_O32_FP64_MUST_BE_ZERO	EF_MIPS_FP64
 40#endif
 41
 42/*
 43 * This is used to ensure we don't load something for the wrong architecture.
 44 */
 45#define elf_check_arch(hdr)						\
 46({									\
 47	int __res = 1;							\
 48	struct elfhdr *__h = (hdr);					\
 49									\
 50	if (__h->e_machine != EM_MIPS)					\
 51		__res = 0;						\
 52	if (__h->e_ident[EI_CLASS] != ELFCLASS32)			\
 53		__res = 0;						\
 54	if ((__h->e_flags & EF_MIPS_ABI2) != 0)				\
 55		__res = 0;						\
 56	if (((__h->e_flags & EF_MIPS_ABI) != 0) &&			\
 57	    ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))		\
 58		__res = 0;						\
 59	if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO)		\
 60		__res = 0;						\
 61									\
 62	__res;								\
 63})
 64
 65#ifdef CONFIG_KVM_GUEST
 66#define TASK32_SIZE		0x3fff8000UL
 67#else
 68#define TASK32_SIZE		0x7fff8000UL
 69#endif
 70#undef ELF_ET_DYN_BASE
 71#define ELF_ET_DYN_BASE		(TASK32_SIZE / 3 * 2)
 72
 73#include <asm/processor.h>
 74
 75/*
 76 * When this file is selected, we are definitely running a 64bit kernel.
 77 * So using the right regs define in asm/reg.h
 78 */
 79#define WANT_COMPAT_REG_H
 80
 81/* These MUST be defined before elf.h gets included */
 82extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
 83#define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
 84#define ELF_CORE_COPY_TASK_REGS(_tsk, _dest)				\
 85({									\
 86	int __res = 1;							\
 87	elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk));		\
 88	__res;								\
 89})
 90
 91#include <linux/module.h>
 92#include <linux/elfcore.h>
 93#include <linux/compat.h>
 94#include <linux/math64.h>
 95
 96#define elf_prstatus elf_prstatus32
 97struct elf_prstatus32
 98{
 99	struct elf_siginfo pr_info;	/* Info associated with signal */
100	short	pr_cursig;		/* Current signal */
101	unsigned int pr_sigpend;	/* Set of pending signals */
102	unsigned int pr_sighold;	/* Set of held signals */
103	pid_t	pr_pid;
104	pid_t	pr_ppid;
105	pid_t	pr_pgrp;
106	pid_t	pr_sid;
107	struct compat_timeval pr_utime; /* User time */
108	struct compat_timeval pr_stime; /* System time */
109	struct compat_timeval pr_cutime;/* Cumulative user time */
110	struct compat_timeval pr_cstime;/* Cumulative system time */
111	elf_gregset_t pr_reg;	/* GP registers */
112	int pr_fpvalid;		/* True if math co-processor being used.  */
113};
114
115#define elf_prpsinfo elf_prpsinfo32
116struct elf_prpsinfo32
117{
118	char	pr_state;	/* numeric process state */
119	char	pr_sname;	/* char for pr_state */
120	char	pr_zomb;	/* zombie */
121	char	pr_nice;	/* nice val */
122	unsigned int pr_flag;	/* flags */
123	__kernel_uid_t	pr_uid;
124	__kernel_gid_t	pr_gid;
125	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
126	/* Lots missing */
127	char	pr_fname[16];	/* filename of executable */
128	char	pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
129};
130
131#define elf_caddr_t	u32
132#define init_elf_binfmt init_elf32_binfmt
133
134#define jiffies_to_timeval jiffies_to_compat_timeval
135static inline void
136jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
137{
138	/*
139	 * Convert jiffies to nanoseconds and separate with
140	 * one divide.
141	 */
142	u64 nsec = (u64)jiffies * TICK_NSEC;
143	u32 rem;
144	value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
145	value->tv_usec = rem / NSEC_PER_USEC;
146}
147
148void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
149{
150	int i;
151
152	for (i = 0; i < EF_R0; i++)
153		grp[i] = 0;
154	grp[EF_R0] = 0;
155	for (i = 1; i <= 31; i++)
156		grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
157	grp[EF_R26] = 0;
158	grp[EF_R27] = 0;
159	grp[EF_LO] = (elf_greg_t) regs->lo;
160	grp[EF_HI] = (elf_greg_t) regs->hi;
161	grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
162	grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
163	grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
164	grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
165#ifdef EF_UNUSED0
166	grp[EF_UNUSED0] = 0;
167#endif
168}
169
170MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
171MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
172
173#undef MODULE_DESCRIPTION
174#undef MODULE_AUTHOR
175
176#undef TASK_SIZE
177#define TASK_SIZE TASK_SIZE32
178
179#undef cputime_to_timeval
180#define cputime_to_timeval cputime_to_compat_timeval
181static __inline__ void
182cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
183{
184	unsigned long jiffies = cputime_to_jiffies(cputime);
185
186	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
187	value->tv_sec = jiffies / HZ;
188}
189
190#include "../../../fs/binfmt_elf.c"