4 Copyright 2008-2012 Michel Pollet <buserror@gmail.com>
6 This file is part of simavr.
8 simavr is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 simavr is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with simavr. If not, see <http://www.gnu.org/licenses/>.
30 #include "sim_interrupts.h"
31 #include "sim_cycle_timers.h"
34 typedef uint8_t (*avr_io_read_t)(
38 typedef void (*avr_io_write_t)(
46 S_C = 0,S_Z,S_N,S_V,S_S,S_H,S_T,S_I,
48 // 16 bits register pairs
49 R_XL = 0x1a, R_XH,R_YL,R_YH,R_ZL,R_ZH,
51 R_SPL = 32+0x3d, R_SPH,
55 // maximum number of IO registers, on normal AVRs
56 MAX_IOs = 256 - 32, // minus 32 GP registers
59 #define AVR_DATA_TO_IO(v) ((v) - 32)
60 #define AVR_IO_TO_DATA(v) ((v) + 32)
66 cpu_Limbo = 0, // before initialization is finished
67 cpu_Stopped, // all is stopped, timers included
69 cpu_Running, // we're free running
71 cpu_Sleeping, // we're now sleeping until an interrupt
73 cpu_Step, // run ONE instruction, then...
74 cpu_StepDone, // tell gdb it's all OK, and give it registers
75 cpu_Done, // avr software stopped gracefully
76 cpu_Crashed, // avr software crashed (watchdog fired)
79 // this is only ever used if CONFIG_SIMAVR_TRACE is defined
80 struct avr_trace_data_t {
81 struct avr_symbol_t ** codeline;
84 * this keeps track of "jumps" ie, call,jmp,ret,reti and so on
85 * allows dumping of a meaningful data even if the stack is
88 #define OLD_PC_SIZE 32
92 } old[OLD_PC_SIZE]; // catches reset..
96 #define STACK_FRAME_SIZE 32
97 // this records the call/ret pairs, to try to catch
98 // code that munches the stack -under- their own frame
102 } stack_frame[STACK_FRAME_SIZE];
103 int stack_frame_index;
107 // keeps track of which registers gets touched by instructions
108 // reset before each new instructions. Allows meaningful traces
109 uint32_t touched[256 / 32]; // debug
113 * Main AVR instance. Some of these fields are set by the AVR "Core" definition files
114 * the rest is runtime data (as little as possible)
116 typedef struct avr_t {
117 const char * mmcu; // name of the AVR
118 // these are filled by sim_core_declare from constants in /usr/lib/avr/include/avr/io*.h
123 uint8_t signature[3];
125 avr_io_addr_t rampz; // optional, only for ELPM/SPM on >64Kb cores
126 avr_io_addr_t eind; // optional, only for EIJMP/EICALL on >64Kb cores
128 // filled by the ELF data, this allow tracking of invalid jumps
131 int state; // stopped, running, sleeping
132 uint32_t frequency; // frequency we are running at
133 // mostly used by the ADC for now
134 uint32_t vcc,avcc,aref; // (optional) voltages in millivolts
136 // cycles gets incremented when sleeping and when running; it corresponds
137 // not only to "cycles that runs" but also "cycles that might have run"
139 avr_cycle_count_t cycle; // current cycle
141 // called at init time
142 void (*init)(struct avr_t * avr);
143 // called at init time (for special purposes like using a memory mapped file as flash see: simduino)
144 void (*special_init)(struct avr_t * avr);
145 // called at termination time ( to clean special initalizations)
146 void (*special_deinit)(struct avr_t * avr);
147 // called at reset time
148 void (*reset)(struct avr_t * avr);
151 * Default AVR core run function.
152 * Two modes are available, a "raw" run that goes as fast as
153 * it can, and a "gdb" mode that also watchouts for gdb events
154 * and is a little bit slower.
156 void (*run)(struct avr_t * avr);
159 * Sleep default behaviour.
160 * In "raw" mode, it calls usleep, in gdb mode, it waits
161 * for howLong for gdb command on it's sockets.
163 void (*sleep)(struct avr_t * avr, avr_cycle_count_t howLong);
166 * Every IRQs will be stored in this pool. It is not
167 * mandatory (yet) but will allow listing IRQs and their connections
169 avr_irq_pool_t irq_pool;
171 // Mirror of the SREG register, to facilitate the access to bits
172 // in the opcode decoder.
173 // This array is re-synthetized back/forth when SREG changes
175 uint8_t i_shadow; // used to detect edges on I flag
179 * Note that the PC is representing /bytes/ while the AVR value is
180 * assumed to be "words". This is in line with what GDB does...
181 * this is why you will see >>1 and <<1 in the decoder to handle jumps.
182 * It CAN be a little confusing, so concentrate, young grasshopper.
187 * callback when specific IO registers are read/written.
188 * There is one drawback here, there is in way of knowing what is the
189 * "beginning of useful sram" on a core, so there is no way to deduce
190 * what is the maximum IO register for a core, and thus, we can't
191 * allocate this table dynamically.
192 * If you wanted to emulate the BIG AVRs, and XMegas, this would need
196 struct avr_irq_t * irq; // optional, used only if asked for with avr_iomem_getirq()
208 * This block allows sharing of the IO write/read on addresses between
209 * multiple callbacks. In 99% of case it's not needed, however on the tiny*
210 * (tiny85 at last) some registers have bits that are used by different
212 * If this case is detected, a special "dispatch" callback is installed that
213 * will handle this particular case, without impacting the performance of the
214 * other, normal cases...
216 int io_shared_io_count;
225 // flash memory (initialized to 0xff, and code loaded into it)
227 // this is the general purpose registers, IO registers, and SRAM
230 // queue of io modules
231 struct avr_io_t *io_port;
233 // cycle timers tracking & delivery
234 avr_cycle_timer_pool_t cycle_timers;
235 // interrupt vectors and delivery fifo
236 avr_int_table_t interrupts;
238 // DEBUG ONLY -- value ignored if CONFIG_SIMAVR_TRACE = 0
240 log : 2; // log level, default to 1
242 // Only used if CONFIG_SIMAVR_TRACE is defined
243 struct avr_trace_data_t *trace_data;
245 // VALUE CHANGE DUMP file (waveforms)
246 // this is the VCD file that gets allocated if the
247 // firmware that is loaded explicitly asks for a trace
248 // to be generated, and allocates it's own symbols
249 // using AVR_MMCU_TAG_VCD_TRACE (see avr_mcu_section.h)
250 struct avr_vcd_t * vcd;
252 // gdb hooking structure. Only present when gdb server is active
253 struct avr_gdb_t * gdb;
255 // if non-zero, the gdb server will be started when the core
256 // crashed even if not activated at startup
257 // if zero, the simulator will just exit() in case of a crash
262 // this is a static constructor for each of the AVR devices
263 typedef struct avr_kind_t {
264 const char * names[4]; // name aliases
268 // a symbol loaded from the .elf file
269 typedef struct avr_symbol_t {
274 // locate the maker for mcu "name" and allocates a new avr instance
276 avr_make_mcu_by_name(
278 // initializes a new AVR instance. Will call the IO registers init(), and then reset()
282 // resets the AVR, and the IO modules
286 // run one cycle of the AVR, sleep if necessary
290 // finish any pending operations
295 // set an IO register to receive commands from the AVR firmware
296 // it's optional, and uses the ELF tags
298 avr_set_command_register(
302 // specify the "console register" -- output sent to this register
303 // is printed on the simulator console, without using a UART
305 avr_set_console_register(
309 // load code in the "flash"
318 * these are accessors for avr->data but allows watchpoints to be set for gdb
319 * IO modules use that to set values to registers, and the AVR core decoder uses
320 * that to register "public" read by instructions.
323 avr_core_watch_write(
332 // called when the core has detected a crash somehow.
333 // this might activate gdb server
341 * These are callbacks for the two 'main' bahaviour in simavr
343 void avr_callback_sleep_gdb(avr_t * avr, avr_cycle_count_t howLong);
344 void avr_callback_run_gdb(avr_t * avr);
345 void avr_callback_sleep_raw(avr_t * avr, avr_cycle_count_t howLong);
346 void avr_callback_run_raw(avr_t * avr);
353 #include "sim_regbit.h"
355 #endif /*__SIM_AVR_H__*/