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100 lines
4.2 KiB
Diff
100 lines
4.2 KiB
Diff
copied from kernel as it is sanitized now
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---
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sysdeps/unix/sysv/linux/m68k/sys/user.h | 87 ++++++++++++++++++++++++++++++++
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1 file changed, 87 insertions(+)
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--- a/sysdeps/unix/sysv/linux/m68k/sys/user.h
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+++ b/sysdeps/unix/sysv/linux/m68k/sys/user.h
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@@ -1,3 +1,90 @@
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+#ifndef _SYS_USER_H
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+#define _SYS_USER_H
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+
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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 (under
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+ linux we use the 'trad-core' bfd). There are quite a number of
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+ obstacles to being able to view the contents of the floating point
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+ registers, and until these are solved you will not be able to view the
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+ contents of them. Actually, you can read in the core file and look at
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+ the contents of the user struct to find out what the floating point
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+ registers 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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+
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+struct user_m68kfp_struct {
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+ unsigned long fpregs[8*3]; /* fp0-fp7 registers */
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+ unsigned long fpcntl[3]; /* fp control regs */
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+};
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+
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+/* This is the old layout of "struct pt_regs" as of Linux 1.x, and
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+ is still the layout used by user (the new pt_regs doesn't have
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+ all registers). */
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+struct user_regs_struct {
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+ long d1,d2,d3,d4,d5,d6,d7;
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+ long a0,a1,a2,a3,a4,a5,a6;
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+ long d0;
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+ long usp;
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+ long orig_d0;
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+ short stkadj;
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+ short sr;
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+ long pc;
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+ short fmtvec;
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+ short __fill;
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+};
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+
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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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+ struct user_m68kfp_struct m68kfp; /* 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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+ struct user_regs_struct *u_ar0;
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+ /* Used by gdb to help find the values for */
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+ /* the registers. */
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+ struct user_m68kfp_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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+};
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+#define NBPG 4096
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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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+
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+#endif
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/* Copyright (C) 2008 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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