Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Support for 32-bit Linux for S390 ELF binaries. |
| 3 | * |
| 4 | * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| 5 | * Author(s): Gerhard Tonn (ton@de.ibm.com) |
| 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) |
| 9 | * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek (jj@ultra.linux.cz) |
| 10 | */ |
| 11 | |
| 12 | #define __ASMS390_ELF_H |
| 13 | |
| 14 | #include <linux/time.h> |
| 15 | |
| 16 | /* |
| 17 | * These are used to set parameters in the core dumps. |
| 18 | */ |
| 19 | #define ELF_CLASS ELFCLASS32 |
| 20 | #define ELF_DATA ELFDATA2MSB |
| 21 | #define ELF_ARCH EM_S390 |
| 22 | |
| 23 | /* |
| 24 | * This is used to ensure we don't load something for the wrong architecture. |
| 25 | */ |
| 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) |
| 29 | |
| 30 | /* ELF register definitions */ |
| 31 | #define NUM_GPRS 16 |
| 32 | #define NUM_FPRS 16 |
| 33 | #define NUM_ACRS 16 |
| 34 | |
| 35 | /* For SVR4/S390 the function pointer to be registered with `atexit` is |
| 36 | passed in R14. */ |
| 37 | #define ELF_PLAT_INIT(_r, load_addr) \ |
| 38 | do { \ |
| 39 | _r->gprs[14] = 0; \ |
| 40 | } while(0) |
| 41 | |
| 42 | #define USE_ELF_CORE_DUMP |
| 43 | #define ELF_EXEC_PAGESIZE 4096 |
| 44 | |
| 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. */ |
| 49 | |
| 50 | #define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2) |
| 51 | |
| 52 | /* Wow, the "main" arch needs arch dependent functions too.. :) */ |
| 53 | |
| 54 | /* regs is struct pt_regs, pr_reg is elf_gregset_t (which is |
| 55 | now struct_user_regs, they are different) */ |
| 56 | |
| 57 | #define ELF_CORE_COPY_REGS(pr_reg, regs) dump_regs32(regs, &pr_reg); |
| 58 | |
| 59 | #define ELF_CORE_COPY_TASK_REGS(tsk, regs) dump_task_regs32(tsk, regs) |
| 60 | |
| 61 | #define ELF_CORE_COPY_FPREGS(tsk, fpregs) dump_task_fpu(tsk, fpregs) |
| 62 | |
| 63 | /* This yields a mask that user programs can use to figure out what |
| 64 | instruction set this CPU supports. */ |
| 65 | |
| 66 | #define ELF_HWCAP (0) |
| 67 | |
| 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. |
| 71 | |
| 72 | For the moment, we have only optimizations for the Intel generations, |
| 73 | but that could change... */ |
| 74 | |
| 75 | #define ELF_PLATFORM (NULL) |
| 76 | |
| 77 | #define SET_PERSONALITY(ex, ibcs2) \ |
| 78 | do { \ |
| 79 | if (ibcs2) \ |
| 80 | set_personality(PER_SVR4); \ |
| 81 | else if (current->personality != PER_LINUX32) \ |
| 82 | set_personality(PER_LINUX); \ |
| 83 | set_thread_flag(TIF_31BIT); \ |
| 84 | } while (0) |
| 85 | |
| 86 | #include "compat_linux.h" |
| 87 | |
| 88 | typedef _s390_fp_regs32 elf_fpregset_t; |
| 89 | |
| 90 | typedef struct |
| 91 | { |
| 92 | |
| 93 | _psw_t32 psw; |
| 94 | __u32 gprs[__NUM_GPRS]; |
| 95 | __u32 acrs[__NUM_ACRS]; |
| 96 | __u32 orig_gpr2; |
| 97 | } s390_regs32; |
| 98 | typedef s390_regs32 elf_gregset_t; |
| 99 | |
| 100 | static inline int dump_regs32(struct pt_regs *ptregs, elf_gregset_t *regs) |
| 101 | { |
| 102 | int i; |
| 103 | |
| 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; |
| 110 | return 1; |
| 111 | } |
| 112 | |
| 113 | static inline int dump_task_regs32(struct task_struct *tsk, elf_gregset_t *regs) |
| 114 | { |
Al Viro | c7584fb | 2006-01-12 01:05:49 -0800 | [diff] [blame] | 115 | struct pt_regs *ptregs = task_pt_regs(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | int i; |
| 117 | |
| 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; |
| 124 | return 1; |
| 125 | } |
| 126 | |
| 127 | static inline int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs) |
| 128 | { |
| 129 | if (tsk == current) |
| 130 | save_fp_regs((s390_fp_regs *) fpregs); |
| 131 | else |
| 132 | memcpy(fpregs, &tsk->thread.fp_regs, sizeof(elf_fpregset_t)); |
| 133 | return 1; |
| 134 | } |
| 135 | |
| 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> |
| 142 | |
| 143 | #define elf_prstatus elf_prstatus32 |
| 144 | struct elf_prstatus32 |
| 145 | { |
| 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 */ |
| 150 | pid_t pr_pid; |
| 151 | pid_t pr_ppid; |
| 152 | pid_t pr_pgrp; |
| 153 | pid_t pr_sid; |
| 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. */ |
| 160 | }; |
| 161 | |
| 162 | #define elf_prpsinfo elf_prpsinfo32 |
| 163 | struct elf_prpsinfo32 |
| 164 | { |
| 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 */ |
| 170 | u16 pr_uid; |
| 171 | u16 pr_gid; |
| 172 | pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid; |
| 173 | /* Lots missing */ |
| 174 | char pr_fname[16]; /* filename of executable */ |
| 175 | char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */ |
| 176 | }; |
| 177 | |
| 178 | #include <linux/highuid.h> |
| 179 | |
| 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) |
| 184 | |
| 185 | #define elf_addr_t u32 |
| 186 | /* |
| 187 | #define init_elf_binfmt init_elf32_binfmt |
| 188 | */ |
| 189 | |
| 190 | #undef start_thread |
| 191 | #define start_thread start_thread31 |
| 192 | |
| 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>"); |
| 196 | |
| 197 | #undef MODULE_DESCRIPTION |
| 198 | #undef MODULE_AUTHOR |
| 199 | |
| 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) |
| 204 | { |
| 205 | value->tv_usec = cputime % 1000000; |
| 206 | value->tv_sec = cputime / 1000000; |
| 207 | } |
| 208 | |
| 209 | #include "../../../fs/binfmt_elf.c" |
| 210 | |