binfmt_elfo32.c 4.8 KB

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  1. /*
  2. * Support for o32 Linux/MIPS ELF binaries.
  3. *
  4. * Copyright (C) 1999, 2001 Ralf Baechle
  5. * Copyright (C) 1999, 2001 Silicon Graphics, Inc.
  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. #define ELF_ARCH EM_MIPS
  12. #define ELF_CLASS ELFCLASS32
  13. #ifdef __MIPSEB__
  14. #define ELF_DATA ELFDATA2MSB;
  15. #else /* __MIPSEL__ */
  16. #define ELF_DATA ELFDATA2LSB;
  17. #endif
  18. /* ELF register definitions */
  19. #define ELF_NGREG 45
  20. #define ELF_NFPREG 33
  21. typedef unsigned int elf_greg_t;
  22. typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  23. typedef double elf_fpreg_t;
  24. typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
  25. /*
  26. * This is used to ensure we don't load something for the wrong architecture.
  27. */
  28. #define elf_check_arch(hdr) \
  29. ({ \
  30. int __res = 1; \
  31. struct elfhdr *__h = (hdr); \
  32. \
  33. if (__h->e_machine != EM_MIPS) \
  34. __res = 0; \
  35. if (__h->e_ident[EI_CLASS] != ELFCLASS32) \
  36. __res = 0; \
  37. if ((__h->e_flags & EF_MIPS_ABI2) != 0) \
  38. __res = 0; \
  39. if (((__h->e_flags & EF_MIPS_ABI) != 0) && \
  40. ((__h->e_flags & EF_MIPS_ABI) != EF_MIPS_ABI_O32)) \
  41. __res = 0; \
  42. \
  43. __res; \
  44. })
  45. #ifdef CONFIG_KVM_GUEST
  46. #define TASK32_SIZE 0x3fff8000UL
  47. #else
  48. #define TASK32_SIZE 0x7fff8000UL
  49. #endif
  50. #undef ELF_ET_DYN_BASE
  51. #define ELF_ET_DYN_BASE (TASK32_SIZE / 3 * 2)
  52. #include <asm/processor.h>
  53. /*
  54. * When this file is selected, we are definitely running a 64bit kernel.
  55. * So using the right regs define in asm/reg.h
  56. */
  57. #define WANT_COMPAT_REG_H
  58. /* These MUST be defined before elf.h gets included */
  59. extern void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs);
  60. #define ELF_CORE_COPY_REGS(_dest, _regs) elf32_core_copy_regs(_dest, _regs);
  61. #define ELF_CORE_COPY_TASK_REGS(_tsk, _dest) \
  62. ({ \
  63. int __res = 1; \
  64. elf32_core_copy_regs(*(_dest), task_pt_regs(_tsk)); \
  65. __res; \
  66. })
  67. #include <linux/module.h>
  68. #include <linux/elfcore.h>
  69. #include <linux/compat.h>
  70. #include <linux/math64.h>
  71. #define elf_prstatus elf_prstatus32
  72. struct elf_prstatus32
  73. {
  74. struct elf_siginfo pr_info; /* Info associated with signal */
  75. short pr_cursig; /* Current signal */
  76. unsigned int pr_sigpend; /* Set of pending signals */
  77. unsigned int pr_sighold; /* Set of held signals */
  78. pid_t pr_pid;
  79. pid_t pr_ppid;
  80. pid_t pr_pgrp;
  81. pid_t pr_sid;
  82. struct compat_timeval pr_utime; /* User time */
  83. struct compat_timeval pr_stime; /* System time */
  84. struct compat_timeval pr_cutime;/* Cumulative user time */
  85. struct compat_timeval pr_cstime;/* Cumulative system time */
  86. elf_gregset_t pr_reg; /* GP registers */
  87. int pr_fpvalid; /* True if math co-processor being used. */
  88. };
  89. #define elf_prpsinfo elf_prpsinfo32
  90. struct elf_prpsinfo32
  91. {
  92. char pr_state; /* numeric process state */
  93. char pr_sname; /* char for pr_state */
  94. char pr_zomb; /* zombie */
  95. char pr_nice; /* nice val */
  96. unsigned int pr_flag; /* flags */
  97. __kernel_uid_t pr_uid;
  98. __kernel_gid_t pr_gid;
  99. pid_t pr_pid, pr_ppid, pr_pgrp, pr_sid;
  100. /* Lots missing */
  101. char pr_fname[16]; /* filename of executable */
  102. char pr_psargs[ELF_PRARGSZ]; /* initial part of arg list */
  103. };
  104. #define elf_caddr_t u32
  105. #define init_elf_binfmt init_elf32_binfmt
  106. #define jiffies_to_timeval jiffies_to_compat_timeval
  107. static inline void
  108. jiffies_to_compat_timeval(unsigned long jiffies, struct compat_timeval *value)
  109. {
  110. /*
  111. * Convert jiffies to nanoseconds and separate with
  112. * one divide.
  113. */
  114. u64 nsec = (u64)jiffies * TICK_NSEC;
  115. u32 rem;
  116. value->tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
  117. value->tv_usec = rem / NSEC_PER_USEC;
  118. }
  119. void elf32_core_copy_regs(elf_gregset_t grp, struct pt_regs *regs)
  120. {
  121. int i;
  122. for (i = 0; i < EF_R0; i++)
  123. grp[i] = 0;
  124. grp[EF_R0] = 0;
  125. for (i = 1; i <= 31; i++)
  126. grp[EF_R0 + i] = (elf_greg_t) regs->regs[i];
  127. grp[EF_R26] = 0;
  128. grp[EF_R27] = 0;
  129. grp[EF_LO] = (elf_greg_t) regs->lo;
  130. grp[EF_HI] = (elf_greg_t) regs->hi;
  131. grp[EF_CP0_EPC] = (elf_greg_t) regs->cp0_epc;
  132. grp[EF_CP0_BADVADDR] = (elf_greg_t) regs->cp0_badvaddr;
  133. grp[EF_CP0_STATUS] = (elf_greg_t) regs->cp0_status;
  134. grp[EF_CP0_CAUSE] = (elf_greg_t) regs->cp0_cause;
  135. #ifdef EF_UNUSED0
  136. grp[EF_UNUSED0] = 0;
  137. #endif
  138. }
  139. MODULE_DESCRIPTION("Binary format loader for compatibility with o32 Linux/MIPS binaries");
  140. MODULE_AUTHOR("Ralf Baechle (ralf@linux-mips.org)");
  141. #undef MODULE_DESCRIPTION
  142. #undef MODULE_AUTHOR
  143. #undef TASK_SIZE
  144. #define TASK_SIZE TASK_SIZE32
  145. #undef cputime_to_timeval
  146. #define cputime_to_timeval cputime_to_compat_timeval
  147. static __inline__ void
  148. cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
  149. {
  150. unsigned long jiffies = cputime_to_jiffies(cputime);
  151. value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
  152. value->tv_sec = jiffies / HZ;
  153. }
  154. #include "../../../fs/binfmt_elf.c"