arch/parisc/kernel/binfmt_elf32.c

/*
 * Support for 32-bit Linux/Parisc ELF binaries on 64 bit kernels
 *
 * Copyright (C) 2000 John Marvin
 * Copyright (C) 2000 Hewlett Packard Co.
 *
 * Heavily inspired from various other efforts to do the same thing
 * (ia64,sparc64/mips64)
 */

/* Make sure include/asm-parisc/elf.h does the right thing */

#define ELF_CLASS	ELFCLASS32

#define ELF_CORE_COPY_REGS(dst, pt)	\
	memset(dst, 0, sizeof(dst));	/* don't leak any "random" bits */ \
	{	int i; \
		for (i = 0; i < 32; i++) dst[i] = (elf_greg_t) pt->gr[i]; \
		for (i = 0; i < 8; i++) dst[32 + i] = (elf_greg_t) pt->sr[i]; \
	} \
	dst[40] = (elf_greg_t) pt->iaoq[0]; dst[41] = (elf_greg_t) pt->iaoq[1]; \
	dst[42] = (elf_greg_t) pt->iasq[0]; dst[43] = (elf_greg_t) pt->iasq[1]; \
	dst[44] = (elf_greg_t) pt->sar;   dst[45] = (elf_greg_t) pt->iir; \
	dst[46] = (elf_greg_t) pt->isr;   dst[47] = (elf_greg_t) pt->ior; \
	dst[48] = (elf_greg_t) mfctl(22); dst[49] = (elf_greg_t) mfctl(0); \
	dst[50] = (elf_greg_t) mfctl(24); dst[51] = (elf_greg_t) mfctl(25); \
	dst[52] = (elf_greg_t) mfctl(26); dst[53] = (elf_greg_t) mfctl(27); \
	dst[54] = (elf_greg_t) mfctl(28); dst[55] = (elf_greg_t) mfctl(29); \
	dst[56] = (elf_greg_t) mfctl(30); dst[57] = (elf_greg_t) mfctl(31); \
	dst[58] = (elf_greg_t) mfctl( 8); dst[59] = (elf_greg_t) mfctl( 9); \
	dst[60] = (elf_greg_t) mfctl(12); dst[61] = (elf_greg_t) mfctl(13); \
	dst[62] = (elf_greg_t) mfctl(10); dst[63] = (elf_greg_t) mfctl(15);


typedef unsigned int elf_greg_t;

#include <linux/spinlock.h>
#include <asm/processor.h>
#include <linux/module.h>
#include <linux/elfcore.h>
#include <linux/compat.h>		/* struct compat_timeval */

#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 */
	u16	pr_uid;
	u16	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_addr_t	unsigned int
#define init_elf_binfmt init_elf32_binfmt

#define ELF_PLATFORM  ("PARISC32\0")

/*
 * We should probably use this macro to set a flag somewhere to indicate
 * this is a 32 on 64 process. We could use PER_LINUX_32BIT, or we
 * could set a processor dependent flag in the thread_struct.
 */

#define SET_PERSONALITY(ex, ibcs2) \
	current->personality = PER_LINUX32; \
	current->thread.map_base = DEFAULT_MAP_BASE32; \
	current->thread.task_size = DEFAULT_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"

/* Set up a separate execution domain for ELF32 binaries running
 * on an ELF64 kernel */

static struct exec_domain parisc32_exec_domain = { 
	.name = "Linux/ELF32",
	.pers_low = PER_LINUX32,
	.pers_high = PER_LINUX32,
};      

static int __init parisc32_exec_init(void)
{
	/* steal the identity signal mappings from the default domain */
	parisc32_exec_domain.signal_map = default_exec_domain.signal_map;
	parisc32_exec_domain.signal_invmap = default_exec_domain.signal_invmap;

	register_exec_domain(&parisc32_exec_domain);

	return 0;
}

__initcall(parisc32_exec_init);