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 * 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
 57/*
 58 * When this file is selected, we are definitely running a 64bit kernel.
 59 * So using the right regs define in asm/reg.h
 60 */
 61#define WANT_COMPAT_REG_H
 62
 63/* These MUST be defined before elf.h gets included */
 64extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
 65#define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
 66#define ELF_CORE_COPY_TASK_REGS(_tsk, _dest)				\
 67({									\
 68	int __res = 1;							\
 69	elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk));		\
 70	__res;								\
 71})
 72
 73#include <linux/module.h>
 74#include <linux/elfcore.h>
 75#include <linux/compat.h>
 76#include <linux/math64.h>
 77
 78#define elf_prstatus elf_prstatus32
 79struct elf_prstatus32
 80{
 81	struct elf_siginfo pr_info;	/* Info associated with signal */
 82	short	pr_cursig;		/* Current signal */
 83	unsigned int pr_sigpend;	/* Set of pending signals */
 84	unsigned int pr_sighold;	/* Set of held signals */
 85	pid_t	pr_pid;
 86	pid_t	pr_ppid;
 87	pid_t	pr_pgrp;
 88	pid_t	pr_sid;
 89	struct compat_timeval pr_utime;	/* User time */
 90	struct compat_timeval pr_stime;	/* System time */
 91	struct compat_timeval pr_cutime;/* Cumulative user time */
 92	struct compat_timeval pr_cstime;/* Cumulative system time */
 93	elf_gregset_t pr_reg;	/* GP registers */
 94	int pr_fpvalid;		/* True if math co-processor being used.  */
 95};
 96
 97#define elf_prpsinfo elf_prpsinfo32
 98struct elf_prpsinfo32
 99{
100	char	pr_state;	/* numeric process state */
101	char	pr_sname;	/* char for pr_state */
102	char	pr_zomb;	/* zombie */
103	char	pr_nice;	/* nice val */
104	unsigned int pr_flag;	/* flags */
105	__kernel_uid_t	pr_uid;
106	__kernel_gid_t	pr_gid;
107	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
108	/* Lots missing */
109	char	pr_fname[16];	/* filename of executable */
110	char	pr_psargs[ELF_PRARGSZ];	/* initial part of arg list */
111};
112
113#define elf_caddr_t	u32
114#define init_elf_binfmt init_elf32_binfmt
115
116#define jiffies_to_timeval jiffies_to_compat_timeval
117static inline void
118jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
119{
120	/*
121	 * Convert jiffies to nanoseconds and separate with
122	 * one divide.
123	 */
124	u64 nsec = (u64)jiffies * TICK_NSEC;
125	u32 rem;
126	value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
127	value->tv_usec = rem / NSEC_PER_USEC;
128}
129
130void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
131{
132	int i;
133
134	for (i = 0; i < EF_R0; i++)
135		grp[i] = 0;
136	grp[EF_R0] = 0;
137	for (i = 1; i <= 31; i++)
138		grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
139	grp[EF_R26] = 0;
140	grp[EF_R27] = 0;
141	grp[EF_LO] = (elf_greg_t) regs->lo;
142	grp[EF_HI] = (elf_greg_t) regs->hi;
143	grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
144	grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
145	grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
146	grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
147#ifdef EF_UNUSED0
148	grp[EF_UNUSED0] = 0;
149#endif
150}
151
152MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
153MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
154
155#undef MODULE_DESCRIPTION
156#undef MODULE_AUTHOR
157
158#undef TASK_SIZE
159#define TASK_SIZE TASK_SIZE32
160
161#include "../../../fs/binfmt_elf.c"