source: SVN/cambria/redboot/packages/hal/arm/arch/current/include/arm_stub.h @ 1

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1#ifndef CYGONCE_HAL_ARM_STUB_H
2#define CYGONCE_HAL_ARM_STUB_H
3//========================================================================
4//
5//      arm_stub.h
6//
7//      ARM-specific definitions for generic stub
8//
9//========================================================================
10//####ECOSGPLCOPYRIGHTBEGIN####
11// -------------------------------------------
12// This file is part of eCos, the Embedded Configurable Operating System.
13// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
14//
15// eCos is free software; you can redistribute it and/or modify it under
16// the terms of the GNU General Public License as published by the Free
17// Software Foundation; either version 2 or (at your option) any later version.
18//
19// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
20// WARRANTY; without even the implied warranty of MERCHANTABILITY or
21// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
22// for more details.
23//
24// You should have received a copy of the GNU General Public License along
25// with eCos; if not, write to the Free Software Foundation, Inc.,
26// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
27//
28// As a special exception, if other files instantiate templates or use macros
29// or inline functions from this file, or you compile this file and link it
30// with other works to produce a work based on this file, this file does not
31// by itself cause the resulting work to be covered by the GNU General Public
32// License. However the source code for this file must still be made available
33// in accordance with section (3) of the GNU General Public License.
34//
35// This exception does not invalidate any other reasons why a work based on
36// this file might be covered by the GNU General Public License.
37//
38// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
39// at http://sources.redhat.com/ecos/ecos-license/
40// -------------------------------------------
41//####ECOSGPLCOPYRIGHTEND####
42//========================================================================
43//#####DESCRIPTIONBEGIN####
44//
45// Author(s):     Red Hat, gthomas
46// Contributors:  Red Hat, gthomas
47// Date:          1998-11-26
48// Purpose:       
49// Description:   ARM-specific definitions for generic stub
50// Usage:         
51//
52//####DESCRIPTIONEND####
53//
54//========================================================================
55
56#ifdef __cplusplus
57extern "C" {
58#endif
59
60// The ARM has float (and possibly other coprocessor) registers that are
61// larger than it can hold in a target_register_t.
62#define TARGET_HAS_LARGE_REGISTERS
63
64// ARM stub has special needs for register handling (not all regs are the
65// the same size), so special put_register and get_register are provided.
66#define CYGARC_STUB_REGISTER_ACCESS_DEFINED 1
67
68#define NUMREGS    (16+8+2)  // 16 GPR, 8 FPR (unused), 2 PS
69
70#define REGSIZE( _x_ ) (((_x_) < F0 || (_x_) >= FPS) ? 4 : 12)
71
72// Comment out to allow for default gdb stub packet buffer which is larger.
73// #define NUMREGBYTES ((16*4)+(8*12)+(2*4))
74
75#ifndef TARGET_REGISTER_T_DEFINED
76#define TARGET_REGISTER_T_DEFINED
77typedef unsigned long target_register_t;
78#endif
79
80enum regnames {
81    R0, R1, R2, R3, R4, R5, R6, R7, 
82    R8, R9, R10, FP, IP, SP, LR, PC,
83    F0, F1, F2, F3, F4, F5, F6, F7, 
84    FPS, PS
85};
86
87#define HAL_STUB_REGISTERS_SIZE \
88 ((sizeof(GDB_Registers) + sizeof(target_register_t) - 1) / sizeof(target_register_t))
89
90#define PS_N 0x80000000
91#define PS_Z 0x40000000
92#define PS_C 0x20000000
93#define PS_V 0x10000000
94
95#define PS_I CPSR_IRQ_DISABLE
96#define PS_F CPSR_FIQ_DISABLE
97
98typedef enum regnames regnames_t;
99
100/* Given a trap value TRAP, return the corresponding signal. */
101extern int __computeSignal (unsigned int trap_number);
102
103/* Return the SPARC trap number corresponding to the last-taken trap. */
104extern int __get_trap_number (void);
105
106/* Return the currently-saved value corresponding to register REG. */
107extern target_register_t get_register (regnames_t reg);
108
109/* Store VALUE in the register corresponding to WHICH. */
110extern void put_register (regnames_t which, target_register_t value);
111
112/* Set the currently-saved pc register value to PC. This also updates NPC
113   as needed. */
114extern void set_pc (target_register_t pc);
115
116/* Set things up so that the next user resume will execute one instruction.
117   This may be done by setting breakpoints or setting a single step flag
118   in the saved user registers, for example. */
119void __single_step (void);
120
121/* Clear the single-step state. */
122void __clear_single_step (void);
123
124/* If the breakpoint we hit is in the breakpoint() instruction, return a
125   non-zero value. */
126extern int __is_breakpoint_function (void);
127
128/* Skip the current instruction. */
129extern void __skipinst (void);
130
131extern void __install_breakpoints (void);
132
133extern void __clear_breakpoints (void);
134
135extern int __is_bsp_syscall(void);
136
137//------------------------------------------------------------------------
138// Special definition of CYG_HAL_GDB_ENTER_CRITICAL_IO_REGION
139
140#ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT
141// we can only do this at all if break support is enabled:
142
143#ifdef __thumb__
144// If this macro is used from Thumb code, we need to pass this information
145// along to the place_break function so it can do the right thing.
146#define CYG_HAL_GDB_ENTER_CRITICAL_IO_REGION( _old_ )                         \
147do {                                                                          \
148    HAL_DISABLE_INTERRUPTS(_old_);                                            \
149    cyg_hal_gdb_place_break((target_register_t)((unsigned long)&&cyg_hal_gdb_break_place + 1));\
150} while ( 0 )
151
152#else
153
154#define CYG_HAL_GDB_ENTER_CRITICAL_IO_REGION( _old_ )                       \
155do {                                                                        \
156    HAL_DISABLE_INTERRUPTS(_old_);                                          \
157    cyg_hal_gdb_place_break((target_register_t)&&cyg_hal_gdb_break_place ); \
158} while ( 0 )
159
160#endif // __thumb_
161
162// Also define ..LEAVE.. with a trick to *use* the label - sometimes the
163// tools want to move the label, which is bad.
164#define CYG_HAL_GDB_LEAVE_CRITICAL_IO_REGION( _old_ )                         \
165do {                                                                          \
166    cyg_hal_gdb_remove_break( (target_register_t)&&cyg_hal_gdb_break_place ); \
167    HAL_RESTORE_INTERRUPTS(_old_);                                            \
168    _old_ = 1; /* actually use the label as a label... */                     \
169cyg_hal_gdb_break_place:                                                      \
170    if ( (_old_)-- > 0 ) /* ...or the compiler might move it! */              \
171        goto cyg_hal_gdb_break_place;                                         \
172} while ( 0 )
173
174#endif // CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT
175
176
177#ifdef __cplusplus
178} /* extern "C" */
179#endif
180
181#endif // ifndef CYGONCE_HAL_ARM_STUB_H
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