6252d702c5
Add support for different number of page table levels dependent on the highest address used for a process. This will cause a 31 bit process to use a two level page table instead of the four level page table that is the default after the pud has been introduced. Likewise a normal 64 bit process will use three levels instead of four. Only if a process runs out of the 4 tera bytes which can be addressed with a three level page table the fourth level is dynamically added. Then the process can use up to 8 peta byte. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
215 lines
5.9 KiB
C
215 lines
5.9 KiB
C
/*
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* Support for 32-bit Linux for S390 ELF binaries.
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*
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* Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Gerhard Tonn (ton@de.ibm.com)
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*
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* Heavily inspired by the 32-bit Sparc compat code which is
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* Copyright (C) 1995, 1996, 1997, 1998 David S. Miller (davem@redhat.com)
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* Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek (jj@ultra.linux.cz)
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*/
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#define __ASMS390_ELF_H
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#include <linux/time.h>
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/*
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* These are used to set parameters in the core dumps.
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*/
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#define ELF_CLASS ELFCLASS32
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#define ELF_DATA ELFDATA2MSB
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#define ELF_ARCH EM_S390
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/*
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* This is used to ensure we don't load something for the wrong architecture.
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*/
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#define elf_check_arch(x) \
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(((x)->e_machine == EM_S390 || (x)->e_machine == EM_S390_OLD) \
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&& (x)->e_ident[EI_CLASS] == ELF_CLASS)
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/* ELF register definitions */
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#define NUM_GPRS 16
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#define NUM_FPRS 16
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#define NUM_ACRS 16
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/* For SVR4/S390 the function pointer to be registered with `atexit` is
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passed in R14. */
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#define ELF_PLAT_INIT(_r, load_addr) \
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do { \
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_r->gprs[14] = 0; \
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} while(0)
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#define USE_ELF_CORE_DUMP
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#define ELF_EXEC_PAGESIZE 4096
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/* This is the location that an ET_DYN program is loaded if exec'ed. Typical
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use of this is to invoke "./ld.so someprog" to test out a new version of
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the loader. We need to make sure that it is out of the way of the program
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that it will "exec", and that there is sufficient room for the brk. */
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#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
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/* Wow, the "main" arch needs arch dependent functions too.. :) */
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/* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
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now struct_user_regs, they are different) */
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#define ELF_CORE_COPY_REGS(pr_reg, regs) dump_regs32(regs, &pr_reg);
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#define ELF_CORE_COPY_TASK_REGS(tsk, regs) dump_task_regs32(tsk, regs)
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#define ELF_CORE_COPY_FPREGS(tsk, fpregs) dump_task_fpu(tsk, fpregs)
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/* This yields a mask that user programs can use to figure out what
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instruction set this CPU supports. */
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#define ELF_HWCAP (0)
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/* This yields a string that ld.so will use to load implementation
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specific libraries for optimization. This is more specific in
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intent than poking at uname or /proc/cpuinfo.
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For the moment, we have only optimizations for the Intel generations,
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but that could change... */
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#define ELF_PLATFORM (NULL)
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#define SET_PERSONALITY(ex, ibcs2) \
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do { \
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if (ibcs2) \
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set_personality(PER_SVR4); \
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else if (current->personality != PER_LINUX32) \
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set_personality(PER_LINUX); \
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set_thread_flag(TIF_31BIT); \
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} while (0)
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#include "compat_linux.h"
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typedef _s390_fp_regs32 elf_fpregset_t;
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typedef struct
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{
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_psw_t32 psw;
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__u32 gprs[__NUM_GPRS];
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__u32 acrs[__NUM_ACRS];
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__u32 orig_gpr2;
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} s390_regs32;
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typedef s390_regs32 elf_gregset_t;
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static inline int dump_regs32(struct pt_regs *ptregs, elf_gregset_t *regs)
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{
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int i;
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memcpy(®s->psw.mask, &ptregs->psw.mask, 4);
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memcpy(®s->psw.addr, (char *)&ptregs->psw.addr + 4, 4);
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for (i = 0; i < NUM_GPRS; i++)
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regs->gprs[i] = ptregs->gprs[i];
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save_access_regs(regs->acrs);
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regs->orig_gpr2 = ptregs->orig_gpr2;
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return 1;
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}
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static inline int dump_task_regs32(struct task_struct *tsk, elf_gregset_t *regs)
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{
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struct pt_regs *ptregs = task_pt_regs(tsk);
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int i;
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memcpy(®s->psw.mask, &ptregs->psw.mask, 4);
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memcpy(®s->psw.addr, (char *)&ptregs->psw.addr + 4, 4);
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for (i = 0; i < NUM_GPRS; i++)
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regs->gprs[i] = ptregs->gprs[i];
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memcpy(regs->acrs, tsk->thread.acrs, sizeof(regs->acrs));
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regs->orig_gpr2 = ptregs->orig_gpr2;
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return 1;
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}
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static inline int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs)
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{
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if (tsk == current)
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save_fp_regs((s390_fp_regs *) fpregs);
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else
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memcpy(fpregs, &tsk->thread.fp_regs, sizeof(elf_fpregset_t));
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return 1;
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}
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#include <asm/processor.h>
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#include <asm/pgalloc.h>
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#include <linux/module.h>
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#include <linux/elfcore.h>
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#include <linux/binfmts.h>
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#include <linux/compat.h>
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#define elf_prstatus elf_prstatus32
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struct elf_prstatus32
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{
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struct elf_siginfo pr_info; /* Info associated with signal */
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short pr_cursig; /* Current signal */
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u32 pr_sigpend; /* Set of pending signals */
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u32 pr_sighold; /* Set of held signals */
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pid_t pr_pid;
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pid_t pr_ppid;
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pid_t pr_pgrp;
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pid_t pr_sid;
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struct compat_timeval pr_utime; /* User time */
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struct compat_timeval pr_stime; /* System time */
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struct compat_timeval pr_cutime; /* Cumulative user time */
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struct compat_timeval pr_cstime; /* Cumulative system time */
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elf_gregset_t pr_reg; /* GP registers */
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int pr_fpvalid; /* True if math co-processor being used. */
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};
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#define elf_prpsinfo elf_prpsinfo32
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struct elf_prpsinfo32
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{
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char pr_state; /* numeric process state */
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char pr_sname; /* char for pr_state */
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char pr_zomb; /* zombie */
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char pr_nice; /* nice val */
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u32 pr_flag; /* flags */
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u16 pr_uid;
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u16 pr_gid;
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pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
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/* Lots missing */
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char pr_fname[16]; /* filename of executable */
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char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
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};
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#include <linux/highuid.h>
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/*
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#define init_elf_binfmt init_elf32_binfmt
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*/
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#undef start_thread
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#define start_thread start_thread31
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static inline void start_thread31(struct pt_regs *regs, unsigned long new_psw,
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unsigned long new_stackp)
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{
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set_fs(USER_DS);
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regs->psw.mask = psw_user32_bits;
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regs->psw.addr = new_psw;
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regs->gprs[15] = new_stackp;
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crst_table_downgrade(current->mm, 1UL << 31);
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}
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MODULE_DESCRIPTION("Binary format loader for compatibility with 32bit Linux for S390 binaries,"
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" Copyright 2000 IBM Corporation");
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MODULE_AUTHOR("Gerhard Tonn <ton@de.ibm.com>");
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#undef MODULE_DESCRIPTION
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#undef MODULE_AUTHOR
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#undef cputime_to_timeval
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#define cputime_to_timeval cputime_to_compat_timeval
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static inline void
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cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
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{
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value->tv_usec = cputime % 1000000;
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value->tv_sec = cputime / 1000000;
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}
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#include "../../../fs/binfmt_elf.c"
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