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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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cad9bc6904
If an o32 process generates a core dump on a 64 bit kernel, the core file will not be correctly recognized. This is because ELF_CORE_COPY_REGS and ELF_CORE_COPY_TASK_REGS are not correctly defined for o32 and will use the default register set which would be CONFIG_64BIT in asm/elf.h. So we'll switch to use the right register defines in this situation by checking for WANT_COMPAT_REG_H and use the right defines of ELF_CORE_COPY_REGS and ELF_CORE_COPY_TASK_REGS. [Ralf: made ELF_CORE_COPY_TASK_REGS() bullet-proof against funny arguments.] Signed-off-by: Yong Zhang <yong.zhang@windriver.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
162 lines
4.4 KiB
C
162 lines
4.4 KiB
C
/*
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* Support for o32 Linux/MIPS ELF binaries.
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*
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* Copyright (C) 1999, 2001 Ralf Baechle
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* Copyright (C) 1999, 2001 Silicon Graphics, Inc.
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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 ELF_ARCH EM_MIPS
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#define ELF_CLASS ELFCLASS32
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#ifdef __MIPSEB__
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#define ELF_DATA ELFDATA2MSB;
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#else /* __MIPSEL__ */
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#define ELF_DATA ELFDATA2LSB;
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#endif
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/* ELF register definitions */
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#define ELF_NGREG 45
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#define ELF_NFPREG 33
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typedef unsigned int elf_greg_t;
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typedef elf_greg_t elf_gregset_t[ELF_NGREG];
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typedef double elf_fpreg_t;
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typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
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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(hdr) \
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({ \
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int __res = 1; \
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struct elfhdr *__h = (hdr); \
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\
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if (__h->e_machine != EM_MIPS) \
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__res = 0; \
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if (__h->e_ident[EI_CLASS] != ELFCLASS32) \
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__res = 0; \
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if ((__h->e_flags & EF_MIPS_ABI2) != 0) \
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__res = 0; \
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if (((__h->e_flags & EF_MIPS_ABI) != 0) && \
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((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32)) \
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__res = 0; \
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\
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__res; \
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})
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#define TASK32_SIZE 0x7fff8000UL
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#undef ELF_ET_DYN_BASE
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#define ELF_ET_DYN_BASE (TASK32_SIZE / 3 * 2)
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#include <asm/processor.h>
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/*
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* When this file is selected, we are definitely running a 64bit kernel.
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* So using the right regs define in asm/reg.h
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*/
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#define WANT_COMPAT_REG_H
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/* These MUST be defined before elf.h gets included */
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extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
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#define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
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#define ELF_CORE_COPY_TASK_REGS(_tsk, _dest) \
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({ \
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int __res = 1; \
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elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk)); \
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__res; \
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})
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#include <linux/module.h>
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#include <linux/elfcore.h>
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#include <linux/compat.h>
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#include <linux/math64.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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unsigned int pr_sigpend; /* Set of pending signals */
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unsigned int 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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unsigned int pr_flag; /* flags */
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__kernel_uid_t pr_uid;
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__kernel_gid_t 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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#define elf_caddr_t u32
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#define init_elf_binfmt init_elf32_binfmt
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#define jiffies_to_timeval jiffies_to_compat_timeval
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static inline void
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jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
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{
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/*
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* Convert jiffies to nanoseconds and separate with
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* one divide.
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*/
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u64 nsec = (u64)jiffies * TICK_NSEC;
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u32 rem;
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value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
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value->tv_usec = rem / NSEC_PER_USEC;
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}
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void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
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{
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int i;
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for (i = 0; i < EF_R0; i++)
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grp[i] = 0;
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grp[EF_R0] = 0;
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for (i = 1; i <= 31; i++)
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grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
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grp[EF_R26] = 0;
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grp[EF_R27] = 0;
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grp[EF_LO] = (elf_greg_t) regs->lo;
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grp[EF_HI] = (elf_greg_t) regs->hi;
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grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
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grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
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grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
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grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
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#ifdef EF_UNUSED0
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grp[EF_UNUSED0] = 0;
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#endif
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}
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MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
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MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
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#undef MODULE_DESCRIPTION
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#undef MODULE_AUTHOR
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#undef TASK_SIZE
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#define TASK_SIZE TASK_SIZE32
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#include "../../../fs/binfmt_elf.c"
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