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1da177e4 LT |
1 | #ifndef _M68K_USER_H |
2 | #define _M68K_USER_H | |
3 | ||
1da177e4 LT |
4 | /* Core file format: The core file is written in such a way that gdb |
5 | can understand it and provide useful information to the user (under | |
6 | linux we use the 'trad-core' bfd). There are quite a number of | |
7 | obstacles to being able to view the contents of the floating point | |
8 | registers, and until these are solved you will not be able to view the | |
9 | contents of them. Actually, you can read in the core file and look at | |
10 | the contents of the user struct to find out what the floating point | |
11 | registers contain. | |
12 | The actual file contents are as follows: | |
13 | UPAGE: 1 page consisting of a user struct that tells gdb what is present | |
14 | in the file. Directly after this is a copy of the task_struct, which | |
15 | is currently not used by gdb, but it may come in useful at some point. | |
16 | All of the registers are stored as part of the upage. The upage should | |
17 | always be only one page. | |
18 | DATA: The data area is stored. We use current->end_text to | |
19 | current->brk to pick up all of the user variables, plus any memory | |
20 | that may have been malloced. No attempt is made to determine if a page | |
21 | is demand-zero or if a page is totally unused, we just cover the entire | |
22 | range. All of the addresses are rounded in such a way that an integral | |
23 | number of pages is written. | |
24 | STACK: We need the stack information in order to get a meaningful | |
25 | backtrace. We need to write the data from (esp) to | |
26 | current->start_stack, so we round each of these off in order to be able | |
27 | to write an integer number of pages. | |
28 | The minimum core file size is 3 pages, or 12288 bytes. | |
29 | */ | |
30 | ||
31 | struct user_m68kfp_struct { | |
32 | unsigned long fpregs[8*3]; /* fp0-fp7 registers */ | |
33 | unsigned long fpcntl[3]; /* fp control regs */ | |
34 | }; | |
35 | ||
36 | /* This is the old layout of "struct pt_regs" as of Linux 1.x, and | |
37 | is still the layout used by user (the new pt_regs doesn't have | |
38 | all registers). */ | |
39 | struct user_regs_struct { | |
40 | long d1,d2,d3,d4,d5,d6,d7; | |
41 | long a0,a1,a2,a3,a4,a5,a6; | |
42 | long d0; | |
43 | long usp; | |
44 | long orig_d0; | |
45 | short stkadj; | |
46 | short sr; | |
47 | long pc; | |
48 | short fmtvec; | |
49 | short __fill; | |
50 | }; | |
51 | ||
52 | ||
53 | /* When the kernel dumps core, it starts by dumping the user struct - | |
54 | this will be used by gdb to figure out where the data and stack segments | |
55 | are within the file, and what virtual addresses to use. */ | |
56 | struct user{ | |
57 | /* We start with the registers, to mimic the way that "memory" is returned | |
58 | from the ptrace(3,...) function. */ | |
59 | struct user_regs_struct regs; /* Where the registers are actually stored */ | |
60 | /* ptrace does not yet supply these. Someday.... */ | |
61 | int u_fpvalid; /* True if math co-processor being used. */ | |
62 | /* for this mess. Not yet used. */ | |
63 | struct user_m68kfp_struct m68kfp; /* Math Co-processor registers. */ | |
64 | /* The rest of this junk is to help gdb figure out what goes where */ | |
65 | unsigned long int u_tsize; /* Text segment size (pages). */ | |
66 | unsigned long int u_dsize; /* Data segment size (pages). */ | |
67 | unsigned long int u_ssize; /* Stack segment size (pages). */ | |
68 | unsigned long start_code; /* Starting virtual address of text. */ | |
69 | unsigned long start_stack; /* Starting virtual address of stack area. | |
70 | This is actually the bottom of the stack, | |
71 | the top of the stack is always found in the | |
72 | esp register. */ | |
73 | long int signal; /* Signal that caused the core dump. */ | |
74 | int reserved; /* No longer used */ | |
6e16d89b | 75 | unsigned long u_ar0; /* Used by gdb to help find the values for */ |
1da177e4 LT |
76 | /* the registers. */ |
77 | struct user_m68kfp_struct* u_fpstate; /* Math Co-processor pointer. */ | |
78 | unsigned long magic; /* To uniquely identify a core file */ | |
79 | char u_comm[32]; /* User command that was responsible */ | |
80 | }; | |
5e7c4ea8 | 81 | #define NBPG 4096 |
1da177e4 LT |
82 | #define UPAGES 1 |
83 | #define HOST_TEXT_START_ADDR (u.start_code) | |
84 | #define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG) | |
85 | ||
86 | #endif |