x86, um: ... and asm-x86 move

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 137 insertions, 0 deletions

diff --git a/arch/x86/include/asm/user_64.h b/arch/x86/include/asm/user_64.h
new file mode 100644
index 000000000000..38b5799863b4
--- /dev/null
+++ b/arch/x86/include/asm/user_64.h
@@ -0,0 +1,137 @@
+#ifndef ASM_X86__USER_64_H
+#define ASM_X86__USER_64_H
+
+#include <asm/types.h>
+#include <asm/page.h>
+/* Core file format: The core file is written in such a way that gdb
+   can understand it and provide useful information to the user.
+   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.  */
+
+/*
+ * Pentium III FXSR, SSE support
+ *	Gareth Hughes <gareth@valinux.com>, May 2000
+ *
+ * Provide support for the GDB 5.0+ PTRACE_{GET|SET}FPXREGS requests for
+ * interacting with the FXSR-format floating point environment.  Floating
+ * point data can be accessed in the regular format in the usual manner,
+ * and both the standard and SIMD floating point data can be accessed via
+ * the new ptrace requests.  In either case, changes to the FPU environment
+ * will be reflected in the task's state as expected.
+ *
+ * x86-64 support by Andi Kleen.
+ */
+
+/* This matches the 64bit FXSAVE format as defined by AMD. It is the same
+   as the 32bit format defined by Intel, except that the selector:offset pairs
+   for data and eip are replaced with flat 64bit pointers. */
+struct user_i387_struct {
+	unsigned short	cwd;
+	unsigned short	swd;
+	unsigned short	twd;	/* Note this is not the same as
+				   the 32bit/x87/FSAVE twd */
+	unsigned short	fop;
+	__u64	rip;
+	__u64	rdp;
+	__u32	mxcsr;
+	__u32	mxcsr_mask;
+	__u32	st_space[32];	/* 8*16 bytes for each FP-reg = 128 bytes */
+	__u32	xmm_space[64];	/* 16*16 bytes for each XMM-reg = 256 bytes */
+	__u32	padding[24];
+};
+
+/*
+ * Segment register layout in coredumps.
+ */
+struct user_regs_struct {
+	unsigned long	r15;
+	unsigned long	r14;
+	unsigned long	r13;
+	unsigned long	r12;
+	unsigned long	bp;
+	unsigned long	bx;
+	unsigned long	r11;
+	unsigned long	r10;
+	unsigned long	r9;
+	unsigned long	r8;
+	unsigned long	ax;
+	unsigned long	cx;
+	unsigned long	dx;
+	unsigned long	si;
+	unsigned long	di;
+	unsigned long	orig_ax;
+	unsigned long	ip;
+	unsigned long	cs;
+	unsigned long	flags;
+	unsigned long	sp;
+	unsigned long	ss;
+	unsigned long	fs_base;
+	unsigned long	gs_base;
+	unsigned long	ds;
+	unsigned long	es;
+	unsigned long	fs;
+	unsigned long	gs;
+};
+
+/* 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. */
+  int pad0;
+  struct user_i387_struct i387;	/* 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 */
+  int pad1;
+  unsigned long u_ar0;		/* Used by gdb to help find the values for */
+				/* the registers. */
+  struct user_i387_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 */
+  unsigned long u_debugreg[8];
+  unsigned long error_code; /* CPU error code or 0 */
+  unsigned long fault_address; /* CR3 or 0 */
+};
+#define NBPG PAGE_SIZE
+#define UPAGES 1
+#define HOST_TEXT_START_ADDR (u.start_code)
+#define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG)
+
+#endif /* ASM_X86__USER_64_H */