- add a copy of user_regs

diff --git a/libc/sysdeps/linux/m68k/sys/user.h b/libc/sysdeps/linux/m68k/sys/user.h
new file mode 100644 (file)
index 0000000..8114a2b
--- /dev/null
+++ b/libc/sysdeps/linux/m68k/sys/user.h
@@ -0,0 +1,90 @@
+#ifndef _M68K_USER_H
+#define _M68K_USER_H
+/*
+   This file was taken verbatim from linux-2.6.26.5.
+   The linux kernel is Copyright (C) Linus Torvalds et al.
+   and is licensed under the GNU General Public License, version 2.
+*/
+/* Core file format: The core file is written in such a way that gdb
+   can understand it and provide useful information to the user (under
+   linux we use the 'trad-core' bfd).  There are quite a number of
+   obstacles to being able to view the contents of the floating point
+   registers, and until these are solved you will not be able to view the
+   contents of them.  Actually, you can read in the core file and look at
+   the contents of the user struct to find out what the floating point
+   registers contain.
+   The actual file contents are as follows:
+   UPAGE: 1 page consisting of a user struct that tells gdb what is present
+   in the file.  Directly after this is a copy of the task_struct, which
+   is currently not used by gdb, but it may come in useful at some point.
+   All of the registers are stored as part of the upage.  The upage should
+   always be only one page.
+   DATA: The data area is stored.  We use current->end_text to
+   current->brk to pick up all of the user variables, plus any memory
+   that may have been malloced.  No attempt is made to determine if a page
+   is demand-zero or if a page is totally unused, we just cover the entire
+   range.  All of the addresses are rounded in such a way that an integral
+   number of pages is written.
+   STACK: We need the stack information in order to get a meaningful
+   backtrace.  We need to write the data from (esp) to
+   current->start_stack, so we round each of these off in order to be able
+   to write an integer number of pages.
+   The minimum core file size is 3 pages, or 12288 bytes.
+*/
+
+struct user_m68kfp_struct {
+       unsigned long  fpregs[8*3];     /* fp0-fp7 registers */
+       unsigned long  fpcntl[3];       /* fp control regs */
+};
+
+/* This is the old layout of "struct pt_regs" as of Linux 1.x, and
+   is still the layout used by user (the new pt_regs doesn't have
+   all registers). */
+struct user_regs_struct {
+       long d1,d2,d3,d4,d5,d6,d7;
+       long a0,a1,a2,a3,a4,a5,a6;
+       long d0;
+       long usp;
+       long orig_d0;
+       short stkadj;
+       short sr;
+       long pc;
+       short fmtvec;
+       short __fill;
+};
+
+
+/* When the kernel dumps core, it starts by dumping the user struct -
+   this will be used by gdb to figure out where the data and stack segments
+   are within the file, and what virtual addresses to use. */
+struct user{
+/* We start with the registers, to mimic the way that "memory" is returned
+   from the ptrace(3,...) function.  */
+  struct user_regs_struct regs;        /* Where the registers are actually stored */
+/* ptrace does not yet supply these.  Someday.... */
+  int u_fpvalid;               /* True if math co-processor being used. */
+                                /* for this mess. Not yet used. */
+  struct user_m68kfp_struct m68kfp; /* Math Co-processor registers. */
+/* The rest of this junk is to help gdb figure out what goes where */
+  unsigned long int u_tsize;   /* Text segment size (pages). */
+  unsigned long int u_dsize;   /* Data segment size (pages). */
+  unsigned long int u_ssize;   /* Stack segment size (pages). */
+  unsigned long start_code;     /* Starting virtual address of text. */
+  unsigned long start_stack;   /* Starting virtual address of stack area.
+                                  This is actually the bottom of the stack,
+                                  the top of the stack is always found in the
+                                  esp register.  */
+  long int signal;             /* Signal that caused the core dump. */
+  int reserved;                        /* No longer used */
+  unsigned long u_ar0;         /* Used by gdb to help find the values for */
+                               /* the registers. */
+  struct user_m68kfp_struct* u_fpstate;        /* Math Co-processor pointer. */
+  unsigned long magic;         /* To uniquely identify a core file */
+  char u_comm[32];             /* User command that was responsible */
+};
+#define NBPG 4096
+#define UPAGES 1
+#define HOST_TEXT_START_ADDR (u.start_code)
+#define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG)
+
+#endif