diff options
Diffstat (limited to 'arch/s390/kernel/binfmt_elf32.c')
| -rw-r--r-- | arch/s390/kernel/binfmt_elf32.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/arch/s390/kernel/binfmt_elf32.c b/arch/s390/kernel/binfmt_elf32.c new file mode 100644 index 000000000000..03ba5893f17b --- /dev/null +++ b/arch/s390/kernel/binfmt_elf32.c @@ -0,0 +1,210 @@ +/* + * Support for 32-bit Linux for S390 ELF binaries. + * + * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation + * Author(s): Gerhard Tonn (ton@de.ibm.com) + * + * 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 __ASMS390_ELF_H + +#include <linux/time.h> + +/* + * These are used to set parameters in the core dumps. + */ +#define ELF_CLASS ELFCLASS32 +#define ELF_DATA ELFDATA2MSB +#define ELF_ARCH EM_S390 + +/* + * This is used to ensure we don't load something for the wrong architecture. + */ +#define elf_check_arch(x) \ + (((x)->e_machine == EM_S390 || (x)->e_machine == EM_S390_OLD) \ + && (x)->e_ident[EI_CLASS] == ELF_CLASS) + +/* ELF register definitions */ +#define NUM_GPRS 16 +#define NUM_FPRS 16 +#define NUM_ACRS 16 + +/* For SVR4/S390 the function pointer to be registered with `atexit` is + passed in R14. */ +#define ELF_PLAT_INIT(_r, load_addr) \ + do { \ + _r->gprs[14] = 0; \ + } while(0) + +#define USE_ELF_CORE_DUMP +#define ELF_EXEC_PAGESIZE 4096 + +/* This is the location that an ET_DYN program is loaded if exec'ed. Typical + use of this is to invoke "./ld.so someprog" to test out a new version of + the loader. We need to make sure that it is out of the way of the program + that it will "exec", and that there is sufficient room for the brk. */ + +#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2) + +/* Wow, the "main" arch needs arch dependent functions too.. :) */ + +/* regs is struct pt_regs, pr_reg is elf_gregset_t (which is + now struct_user_regs, they are different) */ + +#define ELF_CORE_COPY_REGS(pr_reg, regs) dump_regs32(regs, &pr_reg); + +#define ELF_CORE_COPY_TASK_REGS(tsk, regs) dump_task_regs32(tsk, regs) + +#define ELF_CORE_COPY_FPREGS(tsk, fpregs) dump_task_fpu(tsk, fpregs) + +/* This yields a mask that user programs can use to figure out what + instruction set this CPU supports. */ + +#define ELF_HWCAP (0) + +/* This yields a string that ld.so will use to load implementation + specific libraries for optimization. This is more specific in + intent than poking at uname or /proc/cpuinfo. + + For the moment, we have only optimizations for the Intel generations, + but that could change... */ + +#define ELF_PLATFORM (NULL) + +#define SET_PERSONALITY(ex, ibcs2) \ +do { \ + if (ibcs2) \ + set_personality(PER_SVR4); \ + else if (current->personality != PER_LINUX32) \ + set_personality(PER_LINUX); \ + set_thread_flag(TIF_31BIT); \ +} while (0) + +#include "compat_linux.h" + +typedef _s390_fp_regs32 elf_fpregset_t; + +typedef struct +{ + + _psw_t32 psw; + __u32 gprs[__NUM_GPRS]; + __u32 acrs[__NUM_ACRS]; + __u32 orig_gpr2; +} s390_regs32; +typedef s390_regs32 elf_gregset_t; + +static inline int dump_regs32(struct pt_regs *ptregs, elf_gregset_t *regs) +{ + int i; + + memcpy(®s->psw.mask, &ptregs->psw.mask, 4); + memcpy(®s->psw.addr, (char *)&ptregs->psw.addr + 4, 4); + for (i = 0; i < NUM_GPRS; i++) + regs->gprs[i] = ptregs->gprs[i]; + save_access_regs(regs->acrs); + regs->orig_gpr2 = ptregs->orig_gpr2; + return 1; +} + +static inline int dump_task_regs32(struct task_struct *tsk, elf_gregset_t *regs) +{ + struct pt_regs *ptregs = __KSTK_PTREGS(tsk); + int i; + + memcpy(®s->psw.mask, &ptregs->psw.mask, 4); + memcpy(®s->psw.addr, (char *)&ptregs->psw.addr + 4, 4); + for (i = 0; i < NUM_GPRS; i++) + regs->gprs[i] = ptregs->gprs[i]; + memcpy(regs->acrs, tsk->thread.acrs, sizeof(regs->acrs)); + regs->orig_gpr2 = ptregs->orig_gpr2; + return 1; +} + +static inline int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs) +{ + if (tsk == current) + save_fp_regs((s390_fp_regs *) fpregs); + else + memcpy(fpregs, &tsk->thread.fp_regs, sizeof(elf_fpregset_t)); + return 1; +} + +#include <asm/processor.h> +#include <linux/module.h> +#include <linux/config.h> +#include <linux/elfcore.h> +#include <linux/binfmts.h> +#include <linux/compat.h> + +#define elf_prstatus elf_prstatus32 +struct elf_prstatus32 +{ + struct elf_siginfo pr_info; /* Info associated with signal */ + short pr_cursig; /* Current signal */ + u32 pr_sigpend; /* Set of pending signals */ + u32 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 */ + u32 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 */ +}; + +#include <linux/highuid.h> + +#undef NEW_TO_OLD_UID +#undef NEW_TO_OLD_GID +#define NEW_TO_OLD_UID(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid) +#define NEW_TO_OLD_GID(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid) + +#define elf_addr_t u32 +/* +#define init_elf_binfmt init_elf32_binfmt +*/ + +#undef start_thread +#define start_thread start_thread31 + +MODULE_DESCRIPTION("Binary format loader for compatibility with 32bit Linux for S390 binaries," + " Copyright 2000 IBM Corporation"); +MODULE_AUTHOR("Gerhard Tonn <ton@de.ibm.com>"); + +#undef MODULE_DESCRIPTION +#undef MODULE_AUTHOR + +#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) +{ + value->tv_usec = cputime % 1000000; + value->tv_sec = cputime / 1000000; +} + +#include "../../../fs/binfmt_elf.c" + |