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1 #ifndef _ASM_X86_USER_32_H |
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2 #define _ASM_X86_USER_32_H |
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3 |
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4 #include <asm/page.h> |
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5 /* Core file format: The core file is written in such a way that gdb |
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6 can understand it and provide useful information to the user (under |
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7 linux we use the 'trad-core' bfd). There are quite a number of |
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8 obstacles to being able to view the contents of the floating point |
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9 registers, and until these are solved you will not be able to view the |
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10 contents of them. Actually, you can read in the core file and look at |
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11 the contents of the user struct to find out what the floating point |
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12 registers contain. |
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13 The actual file contents are as follows: |
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14 UPAGE: 1 page consisting of a user struct that tells gdb what is present |
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15 in the file. Directly after this is a copy of the task_struct, which |
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16 is currently not used by gdb, but it may come in useful at some point. |
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17 All of the registers are stored as part of the upage. The upage should |
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18 always be only one page. |
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19 DATA: The data area is stored. We use current->end_text to |
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20 current->brk to pick up all of the user variables, plus any memory |
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21 that may have been malloced. No attempt is made to determine if a page |
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22 is demand-zero or if a page is totally unused, we just cover the entire |
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23 range. All of the addresses are rounded in such a way that an integral |
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24 number of pages is written. |
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25 STACK: We need the stack information in order to get a meaningful |
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26 backtrace. We need to write the data from (esp) to |
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27 current->start_stack, so we round each of these off in order to be able |
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28 to write an integer number of pages. |
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29 The minimum core file size is 3 pages, or 12288 bytes. |
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30 */ |
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31 |
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32 /* |
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33 * Pentium III FXSR, SSE support |
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34 * Gareth Hughes <gareth@valinux.com>, May 2000 |
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35 * |
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36 * Provide support for the GDB 5.0+ PTRACE_{GET|SET}FPXREGS requests for |
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37 * interacting with the FXSR-format floating point environment. Floating |
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38 * point data can be accessed in the regular format in the usual manner, |
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39 * and both the standard and SIMD floating point data can be accessed via |
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40 * the new ptrace requests. In either case, changes to the FPU environment |
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41 * will be reflected in the task's state as expected. |
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42 */ |
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43 |
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44 struct user_i387_struct { |
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45 long cwd; |
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46 long swd; |
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47 long twd; |
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48 long fip; |
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49 long fcs; |
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50 long foo; |
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51 long fos; |
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52 long st_space[20]; /* 8*10 bytes for each FP-reg = 80 bytes */ |
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53 }; |
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54 |
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55 struct user_fxsr_struct { |
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56 unsigned short cwd; |
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57 unsigned short swd; |
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58 unsigned short twd; |
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59 unsigned short fop; |
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60 long fip; |
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61 long fcs; |
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62 long foo; |
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63 long fos; |
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64 long mxcsr; |
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65 long reserved; |
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66 long st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */ |
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67 long xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */ |
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68 long padding[56]; |
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69 }; |
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70 |
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71 /* |
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72 * This is the old layout of "struct pt_regs", and |
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73 * is still the layout used by user mode (the new |
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74 * pt_regs doesn't have all registers as the kernel |
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75 * doesn't use the extra segment registers) |
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76 */ |
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77 struct user_regs_struct { |
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78 unsigned long bx; |
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79 unsigned long cx; |
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80 unsigned long dx; |
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81 unsigned long si; |
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82 unsigned long di; |
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83 unsigned long bp; |
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84 unsigned long ax; |
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85 unsigned long ds; |
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86 unsigned long es; |
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87 unsigned long fs; |
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88 unsigned long gs; |
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89 unsigned long orig_ax; |
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90 unsigned long ip; |
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91 unsigned long cs; |
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92 unsigned long flags; |
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93 unsigned long sp; |
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94 unsigned long ss; |
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95 }; |
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96 |
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97 /* When the kernel dumps core, it starts by dumping the user struct - |
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98 this will be used by gdb to figure out where the data and stack segments |
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99 are within the file, and what virtual addresses to use. */ |
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100 struct user{ |
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101 /* We start with the registers, to mimic the way that "memory" is returned |
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102 from the ptrace(3,...) function. */ |
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103 struct user_regs_struct regs; /* Where the registers are actually stored */ |
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104 /* ptrace does not yet supply these. Someday.... */ |
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105 int u_fpvalid; /* True if math co-processor being used. */ |
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106 /* for this mess. Not yet used. */ |
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107 struct user_i387_struct i387; /* Math Co-processor registers. */ |
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108 /* The rest of this junk is to help gdb figure out what goes where */ |
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109 unsigned long int u_tsize; /* Text segment size (pages). */ |
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110 unsigned long int u_dsize; /* Data segment size (pages). */ |
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111 unsigned long int u_ssize; /* Stack segment size (pages). */ |
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112 unsigned long start_code; /* Starting virtual address of text. */ |
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113 unsigned long start_stack; /* Starting virtual address of stack area. |
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114 This is actually the bottom of the stack, |
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115 the top of the stack is always found in the |
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116 esp register. */ |
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117 long int signal; /* Signal that caused the core dump. */ |
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118 int reserved; /* No longer used */ |
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119 unsigned long u_ar0; /* Used by gdb to help find the values for */ |
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120 /* the registers. */ |
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121 struct user_i387_struct *u_fpstate; /* Math Co-processor pointer. */ |
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122 unsigned long magic; /* To uniquely identify a core file */ |
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123 char u_comm[32]; /* User command that was responsible */ |
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124 int u_debugreg[8]; |
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125 }; |
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126 #define NBPG PAGE_SIZE |
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127 #define UPAGES 1 |
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128 #define HOST_TEXT_START_ADDR (u.start_code) |
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129 #define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG) |
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130 |
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131 #endif /* _ASM_X86_USER_32_H */ |