/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_USER_64_H
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#define _ASM_X86_USER_64_H
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#include <asm/types.h>
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#include <asm/page.h>
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/* Core file format: The core file is written in such a way that gdb
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can understand it and provide useful information to the user.
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There are quite a number of obstacles to being able to view the
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contents of the floating point registers, and until these are
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solved you will not be able to view the contents of them.
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Actually, you can read in the core file and look at the contents of
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the user struct to find out what the floating point registers
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contain.
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The actual file contents are as follows:
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UPAGE: 1 page consisting of a user struct that tells gdb what is present
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in the file. Directly after this is a copy of the task_struct, which
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is currently not used by gdb, but it may come in useful at some point.
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All of the registers are stored as part of the upage. The upage should
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always be only one page.
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DATA: The data area is stored. We use current->end_text to
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current->brk to pick up all of the user variables, plus any memory
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that may have been malloced. No attempt is made to determine if a page
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is demand-zero or if a page is totally unused, we just cover the entire
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range. All of the addresses are rounded in such a way that an integral
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number of pages is written.
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STACK: We need the stack information in order to get a meaningful
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backtrace. We need to write the data from (esp) to
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current->start_stack, so we round each of these off in order to be able
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to write an integer number of pages.
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The minimum core file size is 3 pages, or 12288 bytes. */
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/*
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* Pentium III FXSR, SSE support
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* Gareth Hughes <gareth@valinux.com>, May 2000
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*
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* Provide support for the GDB 5.0+ PTRACE_{GET|SET}FPXREGS requests for
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* interacting with the FXSR-format floating point environment. Floating
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* point data can be accessed in the regular format in the usual manner,
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* and both the standard and SIMD floating point data can be accessed via
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* the new ptrace requests. In either case, changes to the FPU environment
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* will be reflected in the task's state as expected.
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*
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* x86-64 support by Andi Kleen.
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*/
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/* This matches the 64bit FXSAVE format as defined by AMD. It is the same
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as the 32bit format defined by Intel, except that the selector:offset pairs
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for data and eip are replaced with flat 64bit pointers. */
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struct user_i387_struct {
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unsigned short cwd;
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unsigned short swd;
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unsigned short twd; /* Note this is not the same as
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the 32bit/x87/FSAVE twd */
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unsigned short fop;
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__u64 rip;
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__u64 rdp;
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__u32 mxcsr;
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__u32 mxcsr_mask;
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__u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
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__u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
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__u32 padding[24];
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};
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/*
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* Segment register layout in coredumps.
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*/
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struct user_regs_struct {
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unsigned long r15;
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unsigned long r14;
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unsigned long r13;
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unsigned long r12;
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unsigned long bp;
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unsigned long bx;
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unsigned long r11;
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unsigned long r10;
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unsigned long r9;
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unsigned long r8;
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unsigned long ax;
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unsigned long cx;
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unsigned long dx;
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unsigned long si;
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unsigned long di;
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unsigned long orig_ax;
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unsigned long ip;
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unsigned long cs;
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unsigned long flags;
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unsigned long sp;
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unsigned long ss;
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unsigned long fs_base;
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unsigned long gs_base;
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unsigned long ds;
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unsigned long es;
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unsigned long fs;
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unsigned long gs;
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};
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/* When the kernel dumps core, it starts by dumping the user struct -
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this will be used by gdb to figure out where the data and stack segments
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are within the file, and what virtual addresses to use. */
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struct user {
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/* We start with the registers, to mimic the way that "memory" is returned
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from the ptrace(3,...) function. */
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struct user_regs_struct regs; /* Where the registers are actually stored */
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/* ptrace does not yet supply these. Someday.... */
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int u_fpvalid; /* True if math co-processor being used. */
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/* for this mess. Not yet used. */
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int pad0;
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struct user_i387_struct i387; /* Math Co-processor registers. */
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/* The rest of this junk is to help gdb figure out what goes where */
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unsigned long int u_tsize; /* Text segment size (pages). */
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unsigned long int u_dsize; /* Data segment size (pages). */
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unsigned long int u_ssize; /* Stack segment size (pages). */
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unsigned long start_code; /* Starting virtual address of text. */
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unsigned long start_stack; /* Starting virtual address of stack area.
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This is actually the bottom of the stack,
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the top of the stack is always found in the
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esp register. */
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long int signal; /* Signal that caused the core dump. */
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int reserved; /* No longer used */
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int pad1;
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unsigned long u_ar0; /* Used by gdb to help find the values for */
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/* the registers. */
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struct user_i387_struct *u_fpstate; /* Math Co-processor pointer. */
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unsigned long magic; /* To uniquely identify a core file */
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char u_comm[32]; /* User command that was responsible */
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unsigned long u_debugreg[8];
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unsigned long error_code; /* CPU error code or 0 */
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unsigned long fault_address; /* CR3 or 0 */
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};
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#define NBPG PAGE_SIZE
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#define UPAGES 1
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#define HOST_TEXT_START_ADDR (u.start_code)
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#define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG)
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#endif /* _ASM_X86_USER_64_H */
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