[mirror_ubuntu-jammy-kernel.git] / arch / mips / kernel / binfmt_elfo32.c

/*
 * Support for o32 Linux/MIPS ELF binaries.
 *
 * Copyright (C) 1999, 2001 Ralf Baechle
 * Copyright (C) 1999, 2001 Silicon Graphics, Inc.
 *
 * Heavily inspired by the 32-bit Sparc compat code which is
 * Copyright (C) 1995, 1996, 1997, 1998 David S. Miller (davem@redhat.com)
 * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek	(jj@ultra.linux.cz)
 */

#define ELF_ARCH		EM_MIPS
#define ELF_CLASS		ELFCLASS32
#ifdef __MIPSEB__
#define ELF_DATA		ELFDATA2MSB;
#else /* __MIPSEL__ */
#define ELF_DATA		ELFDATA2LSB;
#endif

/* ELF register definitions */
#define ELF_NGREG	45
#define ELF_NFPREG	33

typedef unsigned int elf_greg_t;
typedef elf_greg_t elf_gregset_t[ELF_NGREG];

typedef double elf_fpreg_t;
typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];

/*
 * In order to be sure that we don't attempt to execute an O32 binary which
 * requires 64 bit FP (FR=1) on a system which does not support it we refuse
 * to execute any binary which has bits specified by the following macro set
 * in its ELF header flags.
 */
#ifdef CONFIG_MIPS_O32_FP64_SUPPORT
# define __MIPS_O32_FP64_MUST_BE_ZERO	0
#else
# define __MIPS_O32_FP64_MUST_BE_ZERO	EF_MIPS_FP64
#endif

/*
 * This is used to ensure we don't load something for the wrong architecture.
 */
#define elf_check_arch(hdr)						\
({									\
	int __res = 1;							\
	struct elfhdr *__h = (hdr);					\
									\
	if (!mips_elf_check_machine(__h))				\
		__res = 0;						\
	if (__h->e_ident[EI_CLASS] != ELFCLASS32)			\
		__res = 0;						\
	if ((__h->e_flags & EF_MIPS_ABI2) != 0)				\
		__res = 0;						\
	if (((__h->e_flags & EF_MIPS_ABI) != 0) &&			\
	    ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32))		\
		__res = 0;						\
	if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO)		\
		__res = 0;						\
									\
	__res;								\
})

#ifdef CONFIG_KVM_GUEST
#define TASK32_SIZE		0x3fff8000UL
#else
#define TASK32_SIZE		0x7fff8000UL
#endif
#undef ELF_ET_DYN_BASE
#define ELF_ET_DYN_BASE		(TASK32_SIZE / 3 * 2)

#include <asm/processor.h>

#include <linux/module.h>
#include <linux/elfcore.h>
#include <linux/compat.h>
#include <linux/math64.h>

#define elf_prstatus elf_prstatus32
struct elf_prstatus32
{
	struct elf_siginfo pr_info;	/* Info associated with signal */
	short	pr_cursig;		/* Current signal */
	unsigned int pr_sigpend;	/* Set of pending signals */
	unsigned int pr_sighold;	/* Set of held signals */
	pid_t	pr_pid;
	pid_t	pr_ppid;
	pid_t	pr_pgrp;
	pid_t	pr_sid;
	struct compat_timeval pr_utime; /* User time */
	struct compat_timeval pr_stime; /* System time */
	struct compat_timeval pr_cutime;/* Cumulative user time */
	struct compat_timeval pr_cstime;/* Cumulative system time */
	elf_gregset_t pr_reg;	/* GP registers */
	int pr_fpvalid;		/* True if math co-processor being used.  */
};

#define elf_prpsinfo elf_prpsinfo32
struct elf_prpsinfo32
{
	char	pr_state;	/* numeric process state */
	char	pr_sname;	/* char for pr_state */
	char	pr_zomb;	/* zombie */
	char	pr_nice;	/* nice val */
	unsigned int pr_flag;	/* flags */
	__kernel_uid_t	pr_uid;
	__kernel_gid_t	pr_gid;
	pid_t	pr_pid, pr_ppid, pr_pgrp, pr_sid;
	/* Lots missing */
	char	pr_fname[16];	/* filename of executable */
	char	pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
};

#define elf_caddr_t	u32
#define init_elf_binfmt init_elf32_binfmt

#define jiffies_to_timeval jiffies_to_compat_timeval
static inline void
jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
{
	/*
	 * Convert jiffies to nanoseconds and separate with
	 * one divide.
	 */
	u64 nsec = (u64)jiffies * TICK_NSEC;
	u32 rem;
	value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
	value->tv_usec = rem / NSEC_PER_USEC;
}

MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");

#undef MODULE_DESCRIPTION
#undef MODULE_AUTHOR

#undef TASK_SIZE
#define TASK_SIZE TASK_SIZE32

#undef cputime_to_timeval
#define cputime_to_timeval cputime_to_compat_timeval
static __inline__ void
cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
{
	unsigned long jiffies = cputime_to_jiffies(cputime);

	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
	value->tv_sec = jiffies / HZ;
}

#include "../../../fs/binfmt_elf.c"
Commit	Line	Data
1da177e4 LT	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)
70342287	9	* Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek (jj@ultra.linux.cz)
1da177e4 LT	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
597ce172 PB	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
1da177e4 LT	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	\
f4d3d504	50	if (!mips_elf_check_machine(__h)) \
1da177e4 LT	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)) \
597ce172 PB	58	__res = 0; \
597ce172 PB	59	if (__h->e_flags & __MIPS_O32_FP64_MUST_BE_ZERO) \
1da177e4 LT	60	__res = 0; \
	61	\
	62	__res; \
	63	})
	64
9843b030 SL	65	#ifdef CONFIG_KVM_GUEST
	66	#define TASK32_SIZE 0x3fff8000UL
	67	#else
1da177e4	68	#define TASK32_SIZE 0x7fff8000UL
9843b030	69	#endif
1da177e4	70	#undef ELF_ET_DYN_BASE
70342287	71	#define ELF_ET_DYN_BASE (TASK32_SIZE / 3 * 2)
1da177e4 LT	72
1da177e4 LT	73	#include <asm/processor.h>
cad9bc69	74
1da177e4	75	#include <linux/module.h>
1da177e4 LT	76	#include <linux/elfcore.h>
1da177e4 LT	77	#include <linux/compat.h>
f8bd2258	78	#include <linux/math64.h>
1da177e4 LT	79
	80	#define elf_prstatus elf_prstatus32
	81	struct elf_prstatus32
	82	{
	83	struct elf_siginfo pr_info; /* Info associated with signal */
	84	short pr_cursig; /* Current signal */
	85	unsigned int pr_sigpend; /* Set of pending signals */
	86	unsigned int pr_sighold; /* Set of held signals */
	87	pid_t pr_pid;
	88	pid_t pr_ppid;
	89	pid_t pr_pgrp;
	90	pid_t pr_sid;
70342287 RB	91	struct compat_timeval pr_utime; /* User time */
70342287 RB	92	struct compat_timeval pr_stime; /* System time */
1da177e4 LT	93	struct compat_timeval pr_cutime;/* Cumulative user time */
	94	struct compat_timeval pr_cstime;/* Cumulative system time */
	95	elf_gregset_t pr_reg; /* GP registers */
	96	int pr_fpvalid; /* True if math co-processor being used. */
	97	};
	98
	99	#define elf_prpsinfo elf_prpsinfo32
	100	struct elf_prpsinfo32
	101	{
	102	char pr_state; /* numeric process state */
	103	char pr_sname; /* char for pr_state */
	104	char pr_zomb; /* zombie */
	105	char pr_nice; /* nice val */
	106	unsigned int pr_flag; /* flags */
	107	__kernel_uid_t pr_uid;
	108	__kernel_gid_t pr_gid;
	109	pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
	110	/* Lots missing */
	111	char pr_fname[16]; /* filename of executable */
70342287	112	char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
1da177e4 LT	113	};
1da177e4 LT	114
1da177e4 LT	115	#define elf_caddr_t u32
	116	#define init_elf_binfmt init_elf32_binfmt
	117
	118	#define jiffies_to_timeval jiffies_to_compat_timeval
b053c98f	119	static inline void
1da177e4 LT	120	jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
	121	{
	122	/*
603e82ed	123	* Convert jiffies to nanoseconds and separate with
1da177e4 LT	124	* one divide.
1da177e4 LT	125	*/
42a3b4f2	126	u64 nsec = (u64)jiffies * TICK_NSEC;
f8bd2258 RZ	127	u32 rem;
f8bd2258 RZ	128	value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
909fa64c	129	value->tv_usec = rem / NSEC_PER_USEC;
1da177e4 LT	130	}
1da177e4 LT	131
1da177e4 LT	132	MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
	133	MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
	134
	135	#undef MODULE_DESCRIPTION
	136	#undef MODULE_AUTHOR
	137
c6237645 RB	138	#undef TASK_SIZE
	139	#define TASK_SIZE TASK_SIZE32
	140
7b741aa4 RB	141	#undef cputime_to_timeval
	142	#define cputime_to_timeval cputime_to_compat_timeval
	143	static __inline__ void
	144	cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
	145	{
	146	unsigned long jiffies = cputime_to_jiffies(cputime);
	147
	148	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
	149	value->tv_sec = jiffies / HZ;
	150	}
	151
1da177e4	152	#include "../../../fs/binfmt_elf.c"