2 * Support for 32-bit Linux for S390 ELF binaries.
4 * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
5 * Author(s): Gerhard Tonn (ton@de.ibm.com)
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)
12 #define __ASMS390_ELF_H
14 #include <linux/time.h>
17 * These are used to set parameters in the core dumps.
19 #define ELF_CLASS ELFCLASS32
20 #define ELF_DATA ELFDATA2MSB
21 #define ELF_ARCH EM_S390
24 * This is used to ensure we don't load something for the wrong architecture.
26 #define elf_check_arch(x) \
27 (((x)->e_machine == EM_S390 || (x)->e_machine == EM_S390_OLD) \
28 && (x)->e_ident[EI_CLASS] == ELF_CLASS)
30 /* ELF register definitions */
35 /* For SVR4/S390 the function pointer to be registered with `atexit` is
37 #define ELF_PLAT_INIT(_r, load_addr) \
42 #define USE_ELF_CORE_DUMP
43 #define ELF_EXEC_PAGESIZE 4096
45 /* This is the location that an ET_DYN program is loaded if exec'ed. Typical
46 use of this is to invoke "./ld.so someprog" to test out a new version of
47 the loader. We need to make sure that it is out of the way of the program
48 that it will "exec", and that there is sufficient room for the brk. */
50 #define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
52 /* Wow, the "main" arch needs arch dependent functions too.. :) */
54 /* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
55 now struct_user_regs, they are different) */
57 #define ELF_CORE_COPY_REGS(pr_reg, regs) dump_regs32(regs, &pr_reg);
59 #define ELF_CORE_COPY_TASK_REGS(tsk, regs) dump_task_regs32(tsk, regs)
61 #define ELF_CORE_COPY_FPREGS(tsk, fpregs) dump_task_fpu(tsk, fpregs)
63 /* This yields a mask that user programs can use to figure out what
64 instruction set this CPU supports. */
68 /* This yields a string that ld.so will use to load implementation
69 specific libraries for optimization. This is more specific in
70 intent than poking at uname or /proc/cpuinfo.
72 For the moment, we have only optimizations for the Intel generations,
73 but that could change... */
75 #define ELF_PLATFORM (NULL)
77 #define SET_PERSONALITY(ex, ibcs2) \
80 set_personality(PER_SVR4); \
81 else if (current->personality != PER_LINUX32) \
82 set_personality(PER_LINUX); \
83 set_thread_flag(TIF_31BIT); \
86 #include "compat_linux.h"
88 typedef _s390_fp_regs32 elf_fpregset_t;
94 __u32 gprs[__NUM_GPRS];
95 __u32 acrs[__NUM_ACRS];
98 typedef s390_regs32 elf_gregset_t;
100 static inline int dump_regs32(struct pt_regs *ptregs, elf_gregset_t *regs)
104 memcpy(®s->psw.mask, &ptregs->psw.mask, 4);
105 memcpy(®s->psw.addr, (char *)&ptregs->psw.addr + 4, 4);
106 for (i = 0; i < NUM_GPRS; i++)
107 regs->gprs[i] = ptregs->gprs[i];
108 save_access_regs(regs->acrs);
109 regs->orig_gpr2 = ptregs->orig_gpr2;
113 static inline int dump_task_regs32(struct task_struct *tsk, elf_gregset_t *regs)
115 struct pt_regs *ptregs = task_pt_regs(tsk);
118 memcpy(®s->psw.mask, &ptregs->psw.mask, 4);
119 memcpy(®s->psw.addr, (char *)&ptregs->psw.addr + 4, 4);
120 for (i = 0; i < NUM_GPRS; i++)
121 regs->gprs[i] = ptregs->gprs[i];
122 memcpy(regs->acrs, tsk->thread.acrs, sizeof(regs->acrs));
123 regs->orig_gpr2 = ptregs->orig_gpr2;
127 static inline int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs)
130 save_fp_regs((s390_fp_regs *) fpregs);
132 memcpy(fpregs, &tsk->thread.fp_regs, sizeof(elf_fpregset_t));
136 #include <asm/processor.h>
137 #include <linux/module.h>
138 #include <linux/config.h>
139 #include <linux/elfcore.h>
140 #include <linux/binfmts.h>
141 #include <linux/compat.h>
143 #define elf_prstatus elf_prstatus32
144 struct elf_prstatus32
146 struct elf_siginfo pr_info; /* Info associated with signal */
147 short pr_cursig; /* Current signal */
148 u32 pr_sigpend; /* Set of pending signals */
149 u32 pr_sighold; /* Set of held signals */
154 struct compat_timeval pr_utime; /* User time */
155 struct compat_timeval pr_stime; /* System time */
156 struct compat_timeval pr_cutime; /* Cumulative user time */
157 struct compat_timeval pr_cstime; /* Cumulative system time */
158 elf_gregset_t pr_reg; /* GP registers */
159 int pr_fpvalid; /* True if math co-processor being used. */
162 #define elf_prpsinfo elf_prpsinfo32
163 struct elf_prpsinfo32
165 char pr_state; /* numeric process state */
166 char pr_sname; /* char for pr_state */
167 char pr_zomb; /* zombie */
168 char pr_nice; /* nice val */
169 u32 pr_flag; /* flags */
172 pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
174 char pr_fname[16]; /* filename of executable */
175 char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
178 #include <linux/highuid.h>
180 #undef NEW_TO_OLD_UID
181 #undef NEW_TO_OLD_GID
182 #define NEW_TO_OLD_UID(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
183 #define NEW_TO_OLD_GID(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
185 #define elf_addr_t u32
187 #define init_elf_binfmt init_elf32_binfmt
191 #define start_thread start_thread31
193 MODULE_DESCRIPTION("Binary format loader for compatibility with 32bit Linux for S390 binaries,"
194 " Copyright 2000 IBM Corporation");
195 MODULE_AUTHOR("Gerhard Tonn <ton@de.ibm.com>");
197 #undef MODULE_DESCRIPTION
200 #undef cputime_to_timeval
201 #define cputime_to_timeval cputime_to_compat_timeval
202 static __inline__ void
203 cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
205 value->tv_usec = cputime % 1000000;
206 value->tv_sec = cputime / 1000000;
209 #include "../../../fs/binfmt_elf.c"