1 #ifndef __ASM_GENERIC_USER_H !! 1 #ifndef _M68K_USER_H
2 #define __ASM_GENERIC_USER_H !! 2 #define _M68K_USER_H
3 /* <<
4 * This file may define a 'struct user' struct <<
5 * used for a.out files, which are not support <<
6 */ <<
7 3
8 #endif /* __ASM_GENERIC_USER_H */ !! 4 #include <asm/page.h>
>> 5
>> 6 /* Core file format: The core file is written in such a way that gdb
>> 7 can understand it and provide useful information to the user (under
>> 8 linux we use the 'trad-core' bfd). There are quite a number of
>> 9 obstacles to being able to view the contents of the floating point
>> 10 registers, and until these are solved you will not be able to view the
>> 11 contents of them. Actually, you can read in the core file and look at
>> 12 the contents of the user struct to find out what the floating point
>> 13 registers contain.
>> 14 The actual file contents are as follows:
>> 15 UPAGE: 1 page consisting of a user struct that tells gdb what is present
>> 16 in the file. Directly after this is a copy of the task_struct, which
>> 17 is currently not used by gdb, but it may come in useful at some point.
>> 18 All of the registers are stored as part of the upage. The upage should
>> 19 always be only one page.
>> 20 DATA: The data area is stored. We use current->end_text to
>> 21 current->brk to pick up all of the user variables, plus any memory
>> 22 that may have been malloced. No attempt is made to determine if a page
>> 23 is demand-zero or if a page is totally unused, we just cover the entire
>> 24 range. All of the addresses are rounded in such a way that an integral
>> 25 number of pages is written.
>> 26 STACK: We need the stack information in order to get a meaningful
>> 27 backtrace. We need to write the data from (esp) to
>> 28 current->start_stack, so we round each of these off in order to be able
>> 29 to write an integer number of pages.
>> 30 The minimum core file size is 3 pages, or 12288 bytes.
>> 31 */
>> 32
>> 33 struct user_m68kfp_struct {
>> 34 unsigned long fpregs[8*3]; /* fp0-fp7 registers */
>> 35 unsigned long fpcntl[3]; /* fp control regs */
>> 36 };
>> 37
>> 38 /* This is the old layout of "struct pt_regs" as of Linux 1.x, and
>> 39 is still the layout used by user (the new pt_regs doesn't have
>> 40 all registers). */
>> 41 struct user_regs_struct {
>> 42 long d1,d2,d3,d4,d5,d6,d7;
>> 43 long a0,a1,a2,a3,a4,a5,a6;
>> 44 long d0;
>> 45 long usp;
>> 46 long orig_d0;
>> 47 short stkadj;
>> 48 short sr;
>> 49 long pc;
>> 50 short fmtvec;
>> 51 short __fill;
>> 52 };
>> 53
>> 54
>> 55 /* When the kernel dumps core, it starts by dumping the user struct -
>> 56 this will be used by gdb to figure out where the data and stack segments
>> 57 are within the file, and what virtual addresses to use. */
>> 58 struct user{
>> 59 /* We start with the registers, to mimic the way that "memory" is returned
>> 60 from the ptrace(3,...) function. */
>> 61 struct user_regs_struct regs; /* Where the registers are actually stored */
>> 62 /* ptrace does not yet supply these. Someday.... */
>> 63 int u_fpvalid; /* True if math co-processor being used. */
>> 64 /* for this mess. Not yet used. */
>> 65 struct user_m68kfp_struct m68kfp; /* Math Co-processor registers. */
>> 66 /* The rest of this junk is to help gdb figure out what goes where */
>> 67 unsigned long int u_tsize; /* Text segment size (pages). */
>> 68 unsigned long int u_dsize; /* Data segment size (pages). */
>> 69 unsigned long int u_ssize; /* Stack segment size (pages). */
>> 70 unsigned long start_code; /* Starting virtual address of text. */
>> 71 unsigned long start_stack; /* Starting virtual address of stack area.
>> 72 This is actually the bottom of the stack,
>> 73 the top of the stack is always found in the
>> 74 esp register. */
>> 75 long int signal; /* Signal that caused the core dump. */
>> 76 int reserved; /* No longer used */
>> 77 struct user_regs_struct *u_ar0;
>> 78 /* Used by gdb to help find the values for */
>> 79 /* the registers. */
>> 80 struct user_m68kfp_struct* u_fpstate; /* Math Co-processor pointer. */
>> 81 unsigned long magic; /* To uniquely identify a core file */
>> 82 char u_comm[32]; /* User command that was responsible */
>> 83 };
>> 84 #define NBPG PAGE_SIZE
>> 85 #define UPAGES 1
>> 86 #define HOST_TEXT_START_ADDR (u.start_code)
>> 87 #define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG)
>> 88
>> 89 #endif
9 90
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