1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_USER_64_H 3 #define _ASM_X86_USER_64_H 4 5 #include <asm/types.h> 6 #include <asm/page.h> 7 /* Core file format: The core file is written in such a way that gdb 8 can understand it and provide useful information to the user. 9 There are quite a number of obstacles to being able to view the 10 contents of the floating point registers, and until these are 11 solved you will not be able to view the contents of them. 12 Actually, you can read in the core file and look at the contents of 13 the user struct to find out what the floating point registers 14 contain. 15 16 The actual file contents are as follows: 17 UPAGE: 1 page consisting of a user struct that tells gdb what is present 18 in the file. Directly after this is a copy of the task_struct, which 19 is currently not used by gdb, but it may come in useful at some point. 20 All of the registers are stored as part of the upage. The upage should 21 always be only one page. 22 DATA: The data area is stored. We use current->end_text to 23 current->brk to pick up all of the user variables, plus any memory 24 that may have been malloced. No attempt is made to determine if a page 25 is demand-zero or if a page is totally unused, we just cover the entire 26 range. All of the addresses are rounded in such a way that an integral 27 number of pages is written. 28 STACK: We need the stack information in order to get a meaningful 29 backtrace. We need to write the data from (esp) to 30 current->start_stack, so we round each of these off in order to be able 31 to write an integer number of pages. 32 The minimum core file size is 3 pages, or 12288 bytes. */ 33 34 /* 35 * Pentium III FXSR, SSE support 36 * Gareth Hughes <gareth@valinux.com>, May 2000 37 * 38 * Provide support for the GDB 5.0+ PTRACE_{GET|SET}FPXREGS requests for 39 * interacting with the FXSR-format floating point environment. Floating 40 * point data can be accessed in the regular format in the usual manner, 41 * and both the standard and SIMD floating point data can be accessed via 42 * the new ptrace requests. In either case, changes to the FPU environment 43 * will be reflected in the task's state as expected. 44 * 45 * x86-64 support by Andi Kleen. 46 */ 47 48 /* This matches the 64bit FXSAVE format as defined by AMD. It is the same 49 as the 32bit format defined by Intel, except that the selector:offset pairs 50 for data and eip are replaced with flat 64bit pointers. */ 51 struct user_i387_struct { 52 unsigned short cwd; 53 unsigned short swd; 54 unsigned short twd; /* Note this is not the same as 55 the 32bit/x87/FSAVE twd */ 56 unsigned short fop; 57 __u64 rip; 58 __u64 rdp; 59 __u32 mxcsr; 60 __u32 mxcsr_mask; 61 __u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */ 62 __u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */ 63 __u32 padding[24]; 64 }; 65 66 /* 67 * Segment register layout in coredumps. 68 */ 69 struct user_regs_struct { 70 unsigned long r15; 71 unsigned long r14; 72 unsigned long r13; 73 unsigned long r12; 74 unsigned long bp; 75 unsigned long bx; 76 unsigned long r11; 77 unsigned long r10; 78 unsigned long r9; 79 unsigned long r8; 80 unsigned long ax; 81 unsigned long cx; 82 unsigned long dx; 83 unsigned long si; 84 unsigned long di; 85 unsigned long orig_ax; 86 unsigned long ip; 87 unsigned long cs; 88 unsigned long flags; 89 unsigned long sp; 90 unsigned long ss; 91 unsigned long fs_base; 92 unsigned long gs_base; 93 unsigned long ds; 94 unsigned long es; 95 unsigned long fs; 96 unsigned long gs; 97 }; 98 99 /* When the kernel dumps core, it starts by dumping the user struct - 100 this will be used by gdb to figure out where the data and stack segments 101 are within the file, and what virtual addresses to use. */ 102 103 struct user { 104 /* We start with the registers, to mimic the way that "memory" is returned 105 from the ptrace(3,...) function. */ 106 struct user_regs_struct regs; /* Where the registers are actually stored */ 107 /* ptrace does not yet supply these. Someday.... */ 108 int u_fpvalid; /* True if math co-processor being used. */ 109 /* for this mess. Not yet used. */ 110 int pad0; 111 struct user_i387_struct i387; /* Math Co-processor registers. */ 112 /* The rest of this junk is to help gdb figure out what goes where */ 113 unsigned long int u_tsize; /* Text segment size (pages). */ 114 unsigned long int u_dsize; /* Data segment size (pages). */ 115 unsigned long int u_ssize; /* Stack segment size (pages). */ 116 unsigned long start_code; /* Starting virtual address of text. */ 117 unsigned long start_stack; /* Starting virtual address of stack area. 118 This is actually the bottom of the stack, 119 the top of the stack is always found in the 120 esp register. */ 121 long int signal; /* Signal that caused the core dump. */ 122 int reserved; /* No longer used */ 123 int pad1; 124 unsigned long u_ar0; /* Used by gdb to help find the values for */ 125 /* the registers. */ 126 struct user_i387_struct *u_fpstate; /* Math Co-processor pointer. */ 127 unsigned long magic; /* To uniquely identify a core file */ 128 char u_comm[32]; /* User command that was responsible */ 129 unsigned long u_debugreg[8]; 130 unsigned long error_code; /* CPU error code or 0 */ 131 unsigned long fault_address; /* CR3 or 0 */ 132 }; 133 134 #endif /* _ASM_X86_USER_64_H */ 135