WebSVN - shark - Blame - Rev 422 - /shark/trunk/drivers/linuxc26/include/asm/user.h

Rev	Author	Line No.	Line
422	giacomo	1	#ifndef _I386_USER_H
		2	#define _I386_USER_H
		3
		4	#include <asm/page.h>
		5	/* Core file format: The core file is written in such a way that gdb
		6	can understand it and provide useful information to the user (under
		7	linux we use the 'trad-core' bfd). There are quite a number of
		8	obstacles to being able to view the contents of the floating point
		9	registers, and until these are solved you will not be able to view the
		10	contents of them. Actually, you can read in the core file and look at
		11	the contents of the user struct to find out what the floating point
		12	registers contain.
		13	The actual file contents are as follows:
		14	UPAGE: 1 page consisting of a user struct that tells gdb what is present
		15	in the file. Directly after this is a copy of the task_struct, which
		16	is currently not used by gdb, but it may come in useful at some point.
		17	All of the registers are stored as part of the upage. The upage should
		18	always be only one page.
		19	DATA: The data area is stored. We use current->end_text to
		20	current->brk to pick up all of the user variables, plus any memory
		21	that may have been malloced. No attempt is made to determine if a page
		22	is demand-zero or if a page is totally unused, we just cover the entire
		23	range. All of the addresses are rounded in such a way that an integral
		24	number of pages is written.
		25	STACK: We need the stack information in order to get a meaningful
		26	backtrace. We need to write the data from (esp) to
		27	current->start_stack, so we round each of these off in order to be able
		28	to write an integer number of pages.
		29	The minimum core file size is 3 pages, or 12288 bytes.
		30	*/
		31
		32	/*
		33	* Pentium III FXSR, SSE support
		34	* Gareth Hughes <gareth@valinux.com>, May 2000
		35	*
		36	* Provide support for the GDB 5.0+ PTRACE_{GET\|SET}FPXREGS requests for
		37	* interacting with the FXSR-format floating point environment. Floating
		38	* point data can be accessed in the regular format in the usual manner,
		39	* and both the standard and SIMD floating point data can be accessed via
		40	* the new ptrace requests. In either case, changes to the FPU environment
		41	* will be reflected in the task's state as expected.
		42	*/
		43
		44	struct user_i387_struct {
		45	long cwd;
		46	long swd;
		47	long twd;
		48	long fip;
		49	long fcs;
		50	long foo;
		51	long fos;
		52	long st_space[20]; /* 810 bytes for each FP-reg = 80 bytes /
		53	};
		54
		55	struct user_fxsr_struct {
		56	unsigned short cwd;
		57	unsigned short swd;
		58	unsigned short twd;
		59	unsigned short fop;
		60	long fip;
		61	long fcs;
		62	long foo;
		63	long fos;
		64	long mxcsr;
		65	long reserved;
		66	long st_space[32]; /* 816 bytes for each FP-reg = 128 bytes /
		67	long xmm_space[32]; /* 816 bytes for each XMM-reg = 128 bytes /
		68	long padding[56];
		69	};
		70
		71	/*
		72	* This is the old layout of "struct pt_regs", and
		73	* is still the layout used by user mode (the new
		74	* pt_regs doesn't have all registers as the kernel
		75	* doesn't use the extra segment registers)
		76	*/
		77	struct user_regs_struct {
		78	long ebx, ecx, edx, esi, edi, ebp, eax;
		79	unsigned short ds, __ds, es, __es;
		80	unsigned short fs, __fs, gs, __gs;
		81	long orig_eax, eip;
		82	unsigned short cs, __cs;
		83	long eflags, esp;
		84	unsigned short ss, __ss;
		85	};
		86
		87	/* When the kernel dumps core, it starts by dumping the user struct -
		88	this will be used by gdb to figure out where the data and stack segments
		89	are within the file, and what virtual addresses to use. */
		90	struct user{
		91	/* We start with the registers, to mimic the way that "memory" is returned
		92	from the ptrace(3,...) function. */
		93	struct user_regs_struct regs; /* Where the registers are actually stored */
		94	/* ptrace does not yet supply these. Someday.... */
		95	int u_fpvalid; /* True if math co-processor being used. */
		96	/* for this mess. Not yet used. */
		97	struct user_i387_struct i387; /* Math Co-processor registers. */
		98	/* The rest of this junk is to help gdb figure out what goes where */
		99	unsigned long int u_tsize; /* Text segment size (pages). */
		100	unsigned long int u_dsize; /* Data segment size (pages). */
		101	unsigned long int u_ssize; /* Stack segment size (pages). */
		102	unsigned long start_code; /* Starting virtual address of text. */
		103	unsigned long start_stack; /* Starting virtual address of stack area.
		104	This is actually the bottom of the stack,
		105	the top of the stack is always found in the
		106	esp register. */
		107	long int signal; /* Signal that caused the core dump. */
		108	int reserved; /* No longer used */
		109	struct user_pt_regs * u_ar0; /* Used by gdb to help find the values for */
		110	/* the registers. */
		111	struct user_i387_struct* u_fpstate; /* Math Co-processor pointer. */
		112	unsigned long magic; /* To uniquely identify a core file */
		113	char u_comm[32]; /* User command that was responsible */
		114	int u_debugreg[8];
		115	};
		116	#define NBPG PAGE_SIZE
		117	#define UPAGES 1
		118	#define HOST_TEXT_START_ADDR (u.start_code)
		119	#define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG)
		120
		121	#endif /* _I386_USER_H */

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