1/* gdb-stub.h: FRV GDB stub
  2 *
  3 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
  4 * Written by David Howells (dhowells@redhat.com)
  5 * - Derived from asm-mips/gdb-stub.h (c) 1995 Andreas Busse
  6 *
  7 * This program is free software; you can redistribute it and/or
  8 * modify it under the terms of the GNU General Public License
  9 * as published by the Free Software Foundation; either version
 10 * 2 of the License, or (at your option) any later version.
 11 */
 12#ifndef __ASM_GDB_STUB_H
 13#define __ASM_GDB_STUB_H
 14
 15#undef GDBSTUB_DEBUG_IO
 16#undef GDBSTUB_DEBUG_PROTOCOL
 17
 18#include <asm/ptrace.h>
 19
 20/*
 21 * important register numbers in GDB protocol
 22 * - GR0,  GR1,  GR2,  GR3,  GR4,  GR5,  GR6,  GR7,
 23 * - GR8,  GR9,  GR10, GR11, GR12, GR13, GR14, GR15,
 24 * - GR16, GR17, GR18, GR19, GR20, GR21, GR22, GR23,
 25 * - GR24, GR25, GR26, GR27, GR28, GR29, GR30, GR31,
 26 * - GR32, GR33, GR34, GR35, GR36, GR37, GR38, GR39,
 27 * - GR40, GR41, GR42, GR43, GR44, GR45, GR46, GR47,
 28 * - GR48, GR49, GR50, GR51, GR52, GR53, GR54, GR55,
 29 * - GR56, GR57, GR58, GR59, GR60, GR61, GR62, GR63,
 30 * - FR0,  FR1,  FR2,  FR3,  FR4,  FR5,  FR6,  FR7,
 31 * - FR8,  FR9,  FR10, FR11, FR12, FR13, FR14, FR15,
 32 * - FR16, FR17, FR18, FR19, FR20, FR21, FR22, FR23,
 33 * - FR24, FR25, FR26, FR27, FR28, FR29, FR30, FR31,
 34 * - FR32, FR33, FR34, FR35, FR36, FR37, FR38, FR39,
 35 * - FR40, FR41, FR42, FR43, FR44, FR45, FR46, FR47,
 36 * - FR48, FR49, FR50, FR51, FR52, FR53, FR54, FR55,
 37 * - FR56, FR57, FR58, FR59, FR60, FR61, FR62, FR63,
 38 * - PC, PSR, CCR, CCCR,
 39 * - _X132, _X133, _X134
 40 * - TBR, BRR, DBAR0, DBAR1, DBAR2, DBAR3,
 41 * - SCR0, SCR1, SCR2, SCR3,
 42 * - LR, LCR,
 43 * - IACC0H, IACC0L,
 44 * - FSR0,
 45 * - ACC0, ACC1, ACC2, ACC3, ACC4, ACC5, ACC6, ACC7,
 46 * - ACCG0123, ACCG4567,
 47 * - MSR0, MSR1,
 48 * - GNER0, GNER1,
 49 * - FNER0, FNER1,
 50 */
 51#define GDB_REG_GR(N)	(N)
 52#define GDB_REG_FR(N)	(64+(N))
 53#define GDB_REG_PC	128
 54#define GDB_REG_PSR	129
 55#define GDB_REG_CCR	130
 56#define GDB_REG_CCCR	131
 57#define GDB_REG_TBR	135
 58#define GDB_REG_BRR	136
 59#define GDB_REG_DBAR(N)	(137+(N))
 60#define GDB_REG_SCR(N)	(141+(N))
 61#define GDB_REG_LR	145
 62#define GDB_REG_LCR	146
 63#define GDB_REG_FSR0	149
 64#define GDB_REG_ACC(N)	(150+(N))
 65#define GDB_REG_ACCG(N)	(158+(N)/4)
 66#define GDB_REG_MSR(N)	(160+(N))
 67#define GDB_REG_GNER(N)	(162+(N))
 68#define GDB_REG_FNER(N)	(164+(N))
 69
 70#define GDB_REG_SP	GDB_REG_GR(1)
 71#define GDB_REG_FP	GDB_REG_GR(2)
 72
 73#ifndef _LANGUAGE_ASSEMBLY
 74
 75/*
 76 * Prototypes
 77 */
 78extern void show_registers_only(struct pt_regs *regs);
 79
 80extern void gdbstub_init(void);
 81extern void gdbstub(int type);
 82extern void gdbstub_exit(int status);
 83
 84extern void gdbstub_io_init(void);
 85extern void gdbstub_set_baud(unsigned baud);
 86extern int gdbstub_rx_char(unsigned char *_ch, int nonblock);
 87extern void gdbstub_tx_char(unsigned char ch);
 88extern void gdbstub_tx_flush(void);
 89extern void gdbstub_do_rx(void);
 90
 91extern asmlinkage void __debug_stub_init_break(void);
 92extern asmlinkage void __break_hijack_kernel_event(void);
 93extern asmlinkage void __break_hijack_kernel_event_breaks_here(void);
 94
 95extern asmlinkage void gdbstub_rx_handler(void);
 96extern asmlinkage void gdbstub_rx_irq(void);
 97extern asmlinkage void gdbstub_intercept(void);
 98
 99extern uint32_t __entry_usertrap_table[];
100extern uint32_t __entry_kerneltrap_table[];
101
102extern volatile u8	gdbstub_rx_buffer[PAGE_SIZE];
103extern volatile u32	gdbstub_rx_inp;
104extern volatile u32	gdbstub_rx_outp;
105extern volatile u8	gdbstub_rx_overflow;
106extern u8		gdbstub_rx_unget;
107
108extern void gdbstub_printk(const char *fmt, ...);
109extern void debug_to_serial(const char *p, int n);
110extern void console_set_baud(unsigned baud);
111
112#ifdef GDBSTUB_DEBUG_IO
113#define gdbstub_io(FMT,...) gdbstub_printk(FMT, ##__VA_ARGS__)
114#else
115#define gdbstub_io(FMT,...) ({ 0; })
116#endif
117
118#ifdef GDBSTUB_DEBUG_PROTOCOL
119#define gdbstub_proto(FMT,...) gdbstub_printk(FMT,##__VA_ARGS__)
120#else
121#define gdbstub_proto(FMT,...) ({ 0; })
122#endif
123
124/*
125 * we dedicate GR31 to keeping a pointer to the gdbstub exception frame
126 * - gr31 is destroyed on entry to the gdbstub if !MMU
127 * - gr31 is saved in scr3 on entry to the gdbstub if in !MMU
128 */
129register struct frv_frame0 *__debug_frame0 asm("gr31");
130
131#define __debug_frame		(&__debug_frame0->regs)
132#define __debug_user_context	(&__debug_frame0->uc)
133#define __debug_regs		(&__debug_frame0->debug)
134#define __debug_reg(X)		((unsigned long *) ((unsigned long) &__debug_frame0 + (X)))
135
136struct frv_debug_status {
137	unsigned long		bpsr;
138	unsigned long		dcr;
139	unsigned long		brr;
140	unsigned long		nmar;
141};
142
143extern struct frv_debug_status __debug_status;
144
145#endif /* _LANGUAGE_ASSEMBLY */
146#endif /* __ASM_GDB_STUB_H */