arch/tile: core support for Tilera 32-bit chips.

This change is the core kernel support for TILEPro and TILE64 chips.
No driver support (except the console driver) is included yet.

This includes the relevant Linux headers in asm/; the low-level
low-level "Tile architecture" headers in arch/, which are
shared with the hypervisor, etc., and are build-system agnostic;
and the relevant hypervisor headers in hv/.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reviewed-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 163 insertions, 0 deletions

diff --git a/arch/tile/include/asm/ptrace.h b/arch/tile/include/asm/ptrace.h
new file mode 100644
index 00000000000..4d1d9953016
--- /dev/null
+++ b/arch/tile/include/asm/ptrace.h
@@ -0,0 +1,163 @@
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#ifndef _ASM_TILE_PTRACE_H
+#define _ASM_TILE_PTRACE_H
+
+#include <arch/chip.h>
+#include <arch/abi.h>
+
+/* These must match struct pt_regs, below. */
+#if CHIP_WORD_SIZE() == 32
+#define PTREGS_OFFSET_REG(n)    ((n)*4)
+#else
+#define PTREGS_OFFSET_REG(n)    ((n)*8)
+#endif
+#define PTREGS_OFFSET_BASE      0
+#define PTREGS_OFFSET_TP        PTREGS_OFFSET_REG(53)
+#define PTREGS_OFFSET_SP        PTREGS_OFFSET_REG(54)
+#define PTREGS_OFFSET_LR        PTREGS_OFFSET_REG(55)
+#define PTREGS_NR_GPRS          56
+#define PTREGS_OFFSET_PC        PTREGS_OFFSET_REG(56)
+#define PTREGS_OFFSET_EX1       PTREGS_OFFSET_REG(57)
+#define PTREGS_OFFSET_FAULTNUM  PTREGS_OFFSET_REG(58)
+#define PTREGS_OFFSET_ORIG_R0   PTREGS_OFFSET_REG(59)
+#define PTREGS_OFFSET_FLAGS     PTREGS_OFFSET_REG(60)
+#if CHIP_HAS_CMPEXCH()
+#define PTREGS_OFFSET_CMPEXCH   PTREGS_OFFSET_REG(61)
+#endif
+#define PTREGS_SIZE             PTREGS_OFFSET_REG(64)
+
+#ifndef __ASSEMBLY__
+
+#ifdef __KERNEL__
+/* Benefit from consistent use of "long" on all chips. */
+typedef unsigned long pt_reg_t;
+#else
+/* Provide appropriate length type to userspace regardless of -m32/-m64. */
+typedef uint_reg_t pt_reg_t;
+#endif
+
+/*
+ * This struct defines the way the registers are stored on the stack during a
+ * system call/exception.  It should be a multiple of 8 bytes to preserve
+ * normal stack alignment rules.
+ *
+ * Must track <sys/ucontext.h> and <sys/procfs.h>
+ */
+struct pt_regs {
+	/* Saved main processor registers; 56..63 are special. */
+	/* tp, sp, and lr must immediately follow regs[] for aliasing. */
+	pt_reg_t regs[53];
+	pt_reg_t tp;		/* aliases regs[TREG_TP] */
+	pt_reg_t sp;		/* aliases regs[TREG_SP] */
+	pt_reg_t lr;		/* aliases regs[TREG_LR] */
+
+	/* Saved special registers. */
+	pt_reg_t pc;		/* stored in EX_CONTEXT_1_0 */
+	pt_reg_t ex1;		/* stored in EX_CONTEXT_1_1 (PL and ICS bit) */
+	pt_reg_t faultnum;	/* fault number (INT_SWINT_1 for syscall) */
+	pt_reg_t orig_r0;	/* r0 at syscall entry, else zero */
+	pt_reg_t flags;		/* flags (see below) */
+#if !CHIP_HAS_CMPEXCH()
+	pt_reg_t pad[3];
+#else
+	pt_reg_t cmpexch;	/* value of CMPEXCH_VALUE SPR at interrupt */
+	pt_reg_t pad[2];
+#endif
+};
+
+#endif /* __ASSEMBLY__ */
+
+/* Flag bits in pt_regs.flags */
+#define PT_FLAGS_DISABLE_IRQ    1  /* on return to kernel, disable irqs */
+#define PT_FLAGS_CALLER_SAVES   2  /* caller-save registers are valid */
+#define PT_FLAGS_RESTORE_REGS   4  /* restore callee-save regs on return */
+
+#define PTRACE_GETREGS		12
+#define PTRACE_SETREGS		13
+#define PTRACE_GETFPREGS	14
+#define PTRACE_SETFPREGS	15
+
+/* Support TILE-specific ptrace options, with events starting at 16. */
+#define PTRACE_O_TRACEMIGRATE	0x00010000
+#define PTRACE_EVENT_MIGRATE	16
+#ifdef __KERNEL__
+#define PTRACE_O_MASK_TILE	(PTRACE_O_TRACEMIGRATE)
+#define PT_TRACE_MIGRATE	0x00080000
+#define PT_TRACE_MASK_TILE	(PT_TRACE_MIGRATE)
+#endif
+
+#ifdef __KERNEL__
+
+#ifndef __ASSEMBLY__
+
+#define instruction_pointer(regs) ((regs)->pc)
+#define profile_pc(regs) instruction_pointer(regs)
+
+/* Does the process account for user or for system time? */
+#define user_mode(regs) (EX1_PL((regs)->ex1) == USER_PL)
+
+/* Fill in a struct pt_regs with the current kernel registers. */
+struct pt_regs *get_pt_regs(struct pt_regs *);
+
+extern void show_regs(struct pt_regs *);
+
+#define arch_has_single_step()	(1)
+
+/*
+ * A structure for all single-stepper state.
+ *
+ * Also update defines in assembler section if it changes
+ */
+struct single_step_state {
+	/* the page to which we will write hacked-up bundles */
+	void *buffer;
+
+	union {
+		int flags;
+		struct {
+			unsigned long is_enabled:1, update:1, update_reg:6;
+		};
+	};
+
+	unsigned long orig_pc;		/* the original PC */
+	unsigned long next_pc;		/* return PC if no branch (PC + 1) */
+	unsigned long branch_next_pc;	/* return PC if we did branch/jump */
+	unsigned long update_value;	/* value to restore to update_target */
+};
+
+/* Single-step the instruction at regs->pc */
+extern void single_step_once(struct pt_regs *regs);
+
+struct task_struct;
+
+extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
+			 int error_code);
+
+#ifdef __tilegx__
+/* We need this since sigval_t has a user pointer in it, for GETSIGINFO etc. */
+#define __ARCH_WANT_COMPAT_SYS_PTRACE
+#endif
+
+#endif /* !__ASSEMBLY__ */
+
+#define SINGLESTEP_STATE_MASK_IS_ENABLED      0x1
+#define SINGLESTEP_STATE_MASK_UPDATE          0x2
+#define SINGLESTEP_STATE_TARGET_LB              2
+#define SINGLESTEP_STATE_TARGET_UB              7
+
+#endif /* !__KERNEL__ */
+
+#endif /* _ASM_TILE_PTRACE_H */