#include <asm/types.h> #include <asm/page.h> /* Core file format: The core file is written in such a way that gdb can understand it and provide useful information to the user. There are quite a number of obstacles to being able to view the contents of the floating point registers, and until these are solved you will not be able to view the contents of them. Actually, you can read in the core file and look at the contents of the user struct to find out what the floating point registers contain.
The actual file contents are as follows: UPAGE: 1 page consisting of a user struct that tells gdb what is present in the file. Directly after this is a copy of the task_struct, which is currently not used by gdb, but it may come in useful at some point. All of the registers are stored as part of the upage. The upage should always be only one page. DATA: The data area is stored. We use current->end_text to current->brk to pick up all of the user variables, plus any memory that may have been malloced. No attempt is made to determine if a page is demand-zero or if a page is totally unused, we just cover the entire range. All of the addresses are rounded in such a way that an integral number of pages is written. STACK: We need the stack information in order to get a meaningful backtrace. We need to write the data from (esp) to current->start_stack, so we round each of these off in order to be able to write an integer number of pages.
The minimum core file size is 3 pages, or 12288 bytes. */
/* * Pentium III FXSR, SSE support * Gareth Hughes <gareth@valinux.com>, May 2000 * * Provide support for the GDB 5.0+ PTRACE_{GET|SET}FPXREGS requests for * interacting with the FXSR-format floating point environment. Floating * point data can be accessed in the regular format in the usual manner, * and both the standard and SIMD floating point data can be accessed via * the new ptrace requests. In either case, changes to the FPU environment * will be reflected in the task's state as expected. * * x86-64 support by Andi Kleen.
*/
/* This matches the 64bit FXSAVE format as defined by AMD. It is the same as the 32bit format defined by Intel, except that the selector:offset pairs
for data and eip are replaced with flat 64bit pointers. */ struct user_i387_struct { unsignedshort cwd; unsignedshort swd; unsignedshort twd; /* Note this is not the same as
the 32bit/x87/FSAVE twd */ unsignedshort fop;
__u64 rip;
__u64 rdp;
__u32 mxcsr;
__u32 mxcsr_mask;
__u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
__u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
__u32 padding[24];
};
/* When the kernel dumps core, it starts by dumping the user struct - this will be used by gdb to figure out where the data and stack segments
are within the file, and what virtual addresses to use. */
struct user { /* We start with the registers, to mimic the way that "memory" is returned
from the ptrace(3,...) function. */ struct user_regs_struct regs; /* Where the registers are actually stored */ /* ptrace does not yet supply these. Someday.... */ int u_fpvalid; /* True if math co-processor being used. */ /* for this mess. Not yet used. */ int pad0; struct user_i387_struct i387; /* Math Co-processor registers. */ /* The rest of this junk is to help gdb figure out what goes where */ unsignedlongint u_tsize; /* Text segment size (pages). */ unsignedlongint u_dsize; /* Data segment size (pages). */ unsignedlongint u_ssize; /* Stack segment size (pages). */ unsignedlong start_code; /* Starting virtual address of text. */ unsignedlong start_stack; /* Starting virtual address of stack area. This is actually the bottom of the stack, the top of the stack is always found in the
esp register. */ longint signal; /* Signal that caused the core dump. */ int reserved; /* No longer used */ int pad1; unsignedlong u_ar0; /* Used by gdb to help find the values for */ /* the registers. */ struct user_i387_struct *u_fpstate; /* Math Co-processor pointer. */ unsignedlong magic; /* To uniquely identify a core file */ char u_comm[32]; /* User command that was responsible */ unsignedlong u_debugreg[8]; unsignedlong error_code; /* CPU error code or 0 */ unsignedlong fault_address; /* CR3 or 0 */
};
#endif/* _ASM_X86_USER_64_H */
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