自己根据lkd和情境分析
源代码在线查看： binfmt_elf32.c
/* * binfmt_elf32.c: Support 32-bit Sparc ELF binaries on Ultra. * * 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 ELF_ARCH EM_SPARC #define ELF_CLASS ELFCLASS32 #define ELF_DATA ELFDATA2MSB; /* For the most part we present code dumps in the format * Solaris does. */ typedef unsigned int elf_greg_t; #define ELF_NGREG 38 typedef elf_greg_t elf_gregset_t[ELF_NGREG]; /* Format is: * G0 --> G7 * O0 --> O7 * L0 --> L7 * I0 --> I7 * PSR, PC, nPC, Y, WIM, TBR */ #include #define ELF_CORE_COPY_REGS(__elf_regs, __pt_regs) \ do { unsigned int *dest = &(__elf_regs[0]); \ struct pt_regs *src = (__pt_regs); \ unsigned int *sp; \ int i; \ for(i = 0; i < 16; i++) \ dest[i] = (unsigned int) src->u_regs[i];\ /* Don't try this at home kids... */ \ set_fs(USER_DS); \ sp = (unsigned int *) (src->u_regs[14] & \ 0x00000000fffffffc); \ for(i = 0; i < 16; i++) \ __get_user(dest[i+16], &sp[i]); \ set_fs(KERNEL_DS); \ dest[32] = tstate_to_psr(src->tstate); \ dest[33] = (unsigned int) src->tpc; \ dest[34] = (unsigned int) src->tnpc; \ dest[35] = src->y; \ dest[36] = dest[37] = 0; /* XXX */ \ } while(0); typedef struct { union { unsigned int pr_regs[32]; unsigned long pr_dregs[16]; } pr_fr; unsigned int __unused; unsigned int pr_fsr; unsigned char pr_qcnt; unsigned char pr_q_entrysize; unsigned char pr_en; unsigned int pr_q[64]; } elf_fpregset_t; /* UltraSparc extensions. Still unused, but will be eventually. */ typedef struct { unsigned int pr_type; unsigned int pr_align; union { struct { union { unsigned int pr_regs[32]; unsigned long pr_dregs[16]; long double pr_qregs[8]; } pr_xfr; } pr_v8p; unsigned int pr_xfsr; unsigned int pr_fprs; unsigned int pr_xg[8]; unsigned int pr_xo[8]; unsigned long pr_tstate; unsigned int pr_filler[8]; } pr_un; } elf_xregset_t; #define elf_check_arch(x) (((x)->e_machine == EM_SPARC) || ((x)->e_machine == EM_SPARC32PLUS)) #define ELF_ET_DYN_BASE 0x08000000 #include #include #include #include struct timeval32 { int tv_sec, tv_usec; }; #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 timeval32 pr_utime; /* User time */ struct timeval32 pr_stime; /* System time */ struct timeval32 pr_cutime; /* Cumulative user time */ struct timeval32 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 */ }; #include #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 elf_caddr_t u32 #undef start_thread #define start_thread start_thread32 #define init_elf_binfmt init_elf32_binfmt #undef CONFIG_BINFMT_ELF #ifdef CONFIG_BINFMT_ELF32 #define CONFIG_BINFMT_ELF CONFIG_BINFMT_ELF32 #endif #undef CONFIG_BINFMT_ELF_MODULE #ifdef CONFIG_BINFMT_ELF32_MODULE #define CONFIG_BINFMT_ELF_MODULE CONFIG_BINFMT_ELF32_MODULE #endif #define ELF_FLAGS_INIT current->thread.flags |= SPARC_FLAG_32BIT MODULE_DESCRIPTION("Binary format loader for compatibility with 32bit SparcLinux binaries on the Ultra"); MODULE_AUTHOR("Eric Youngdale, David S. Miller, Jakub Jelinek"); #undef MODULE_DESCRIPTION #undef MODULE_AUTHOR #include "../../../fs/binfmt_elf.c"
