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/* Lattice Mico32 exception and system call support.
   Contributed by Jon Beniston <jon@beniston.com>
 
   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
 
   This file is part of GDB.
 
   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; either version 3 of the License, or
   (at your option) any later version.
 
   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.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
#define WANT_CPU lm32bf
#define WANT_CPU_LM32BF
 
#include "sim-main.h"
#include "lm32-sim.h"
#include "targ-vals.h"
 
/* Read memory function for system call interface.  */
 
static int
syscall_read_mem (host_callback * cb, struct cb_syscall *sc,
                  unsigned long taddr, char *buf, int bytes)
{
  SIM_DESC sd = (SIM_DESC) sc->p1;
  SIM_CPU *cpu = (SIM_CPU *) sc->p2;
 
  return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes);
}
 
/* Write memory function for system call interface.  */
 
static int
syscall_write_mem (host_callback * cb, struct cb_syscall *sc,
                   unsigned long taddr, const char *buf, int bytes)
{
  SIM_DESC sd = (SIM_DESC) sc->p1;
  SIM_CPU *cpu = (SIM_CPU *) sc->p2;
 
  return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes);
}
 
/* Handle invalid instructions.  */
 
SEM_PC
sim_engine_invalid_insn (SIM_CPU * current_cpu, IADDR cia, SEM_PC pc)
{
  SIM_DESC sd = CPU_STATE (current_cpu);
 
  sim_engine_halt (sd, current_cpu, NULL, cia, sim_stopped, SIM_SIGILL);
 
  return pc;
}
 
/* Handle divide instructions. */
 
USI
lm32bf_divu_insn (SIM_CPU * current_cpu, IADDR pc, USI r0, USI r1, USI r2)
{
  SIM_DESC sd = CPU_STATE (current_cpu);
  host_callback *cb = STATE_CALLBACK (sd);
 
  /* Check for divide by zero */
  if (GET_H_GR (r1) == 0)
    {
      if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
        sim_engine_halt (sd, current_cpu, NULL, pc, sim_stopped, SIM_SIGFPE);
      else
        {
          /* Save PC in exception address register.  */
          SET_H_GR (30, pc);
          /* Save and clear interrupt enable.  */
          SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 1) << 1);
          /* Branch to divide by zero exception handler.  */
          return GET_H_CSR (LM32_CSR_EBA) + LM32_EID_DIVIDE_BY_ZERO * 32;
        }
    }
  else
    {
      SET_H_GR (r2, (USI) GET_H_GR (r0) / (USI) GET_H_GR (r1));
      return pc + 4;
    }
}
 
USI
lm32bf_modu_insn (SIM_CPU * current_cpu, IADDR pc, USI r0, USI r1, USI r2)
{
  SIM_DESC sd = CPU_STATE (current_cpu);
  host_callback *cb = STATE_CALLBACK (sd);
 
  /* Check for divide by zero.  */
  if (GET_H_GR (r1) == 0)
    {
      if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
        sim_engine_halt (sd, current_cpu, NULL, pc, sim_stopped, SIM_SIGFPE);
      else
        {
          /* Save PC in exception address register.  */
          SET_H_GR (30, pc);
          /* Save and clear interrupt enable.  */
          SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 1) << 1);
          /* Branch to divide by zero exception handler.  */
          return GET_H_CSR (LM32_CSR_EBA) + LM32_EID_DIVIDE_BY_ZERO * 32;
        }
    }
  else
    {
      SET_H_GR (r2, (USI) GET_H_GR (r0) % (USI) GET_H_GR (r1));
      return pc + 4;
    }
}
 
/* Handle break instructions.  */
 
USI
lm32bf_break_insn (SIM_CPU * current_cpu, IADDR pc)
{
  SIM_DESC sd = CPU_STATE (current_cpu);
  host_callback *cb = STATE_CALLBACK (sd);
  /* Breakpoint.  */
  if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
    {
      sim_engine_halt (sd, current_cpu, NULL, pc, sim_stopped, SIM_SIGTRAP);
      return pc;
    }
  else
    {
      /* Save PC in breakpoint address register.  */
      SET_H_GR (31, pc);
      /* Save and clear interrupt enable.  */
      SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 1) << 2);
      /* Branch to breakpoint exception handler.  */
      return GET_H_CSR (LM32_CSR_DEBA) + LM32_EID_BREAKPOINT * 32;
    }
}
 
/* Handle scall instructions.  */
 
USI
lm32bf_scall_insn (SIM_CPU * current_cpu, IADDR pc)
{
  SIM_DESC sd = CPU_STATE (current_cpu);
  host_callback *cb = STATE_CALLBACK (sd);
 
  if ((STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
      || (GET_H_GR (8) == TARGET_SYS_exit))
    {
      /* Delegate system call to host O/S.  */
      CB_SYSCALL s;
      CB_SYSCALL_INIT (&s);
      s.p1 = (PTR) sd;
      s.p2 = (PTR) current_cpu;
      s.read_mem = syscall_read_mem;
      s.write_mem = syscall_write_mem;
      /* Extract parameters.  */
      s.func = GET_H_GR (8);
      s.arg1 = GET_H_GR (1);
      s.arg2 = GET_H_GR (2);
      s.arg3 = GET_H_GR (3);
      /* Halt the simulator if the requested system call is _exit.  */
      if (s.func == TARGET_SYS_exit)
        sim_engine_halt (sd, current_cpu, NULL, pc, sim_exited, s.arg1);
      /* Perform the system call.  */
      cb_syscall (cb, &s);
      /* Store the return value in the CPU's registers.  */
      SET_H_GR (1, s.result);
      SET_H_GR (2, s.result2);
      SET_H_GR (3, s.errcode);
      /* Skip over scall instruction.  */
      return pc + 4;
    }
  else
    {
      /* Save PC in exception address register.  */
      SET_H_GR (30, pc);
      /* Save and clear interrupt enable */
      SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 1) << 1);
      /* Branch to system call exception handler.  */
      return GET_H_CSR (LM32_CSR_EBA) + LM32_EID_SYSTEM_CALL * 32;
    }
}
 
/* Handle b instructions.  */
 
USI
lm32bf_b_insn (SIM_CPU * current_cpu, USI r0, USI f_r0)
{
  SIM_DESC sd = CPU_STATE (current_cpu);
  host_callback *cb = STATE_CALLBACK (sd);
 
  /* Restore interrupt enable.  */
  if (f_r0 == 30)
    SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 2) >> 1);
  else if (f_r0 == 31)
    SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 4) >> 2);
  return r0;
}
 
/* Handle wcsr instructions.  */
 
void
lm32bf_wcsr_insn (SIM_CPU * current_cpu, USI f_csr, USI r1)
{
  SIM_DESC sd = CPU_STATE (current_cpu);
  host_callback *cb = STATE_CALLBACK (sd);
 
  /* Writing a 1 to IP CSR clears a bit, writing 0 has no effect.  */
  if (f_csr == LM32_CSR_IP)
    SET_H_CSR (f_csr, GET_H_CSR (f_csr) & ~r1);
  else
    SET_H_CSR (f_csr, r1);
}
 
/* Handle signals.  */
 
void
lm32_core_signal (SIM_DESC sd,
                  sim_cpu * cpu,
                  sim_cia cia,
                  unsigned map,
                  int nr_bytes,
                  address_word addr,
                  transfer_type transfer, sim_core_signals sig)
{
  const char *copy = (transfer == read_transfer ? "read" : "write");
  address_word ip = CIA_ADDR (cia);
  SIM_CPU *current_cpu = cpu;
 
  switch (sig)
    {
    case sim_core_unmapped_signal:
      sim_io_eprintf (sd,
                      "core: %d byte %s to unmapped address 0x%lx at 0x%lx\n",
                      nr_bytes, copy, (unsigned long) addr,
                      (unsigned long) ip);
      SET_H_GR (30, ip);
      /* Save and clear interrupt enable.  */
      SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 1) << 1);
      CIA_SET (cpu, GET_H_CSR (LM32_CSR_EBA) + LM32_EID_DATA_BUS_ERROR * 32);
      sim_engine_halt (sd, cpu, NULL, LM32_EID_DATA_BUS_ERROR * 32,
                       sim_stopped, SIM_SIGSEGV);
      break;
    case sim_core_unaligned_signal:
      sim_io_eprintf (sd,
                      "core: %d byte misaligned %s to address 0x%lx at 0x%lx\n",
                      nr_bytes, copy, (unsigned long) addr,
                      (unsigned long) ip);
      SET_H_GR (30, ip);
      /* Save and clear interrupt enable.  */
      SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 1) << 1);
      CIA_SET (cpu, GET_H_CSR (LM32_CSR_EBA) + LM32_EID_DATA_BUS_ERROR * 32);
      sim_engine_halt (sd, cpu, NULL, LM32_EID_DATA_BUS_ERROR * 32,
                       sim_stopped, SIM_SIGBUS);
      break;
    default:
      sim_engine_abort (sd, cpu, cia,
                        "sim_core_signal - internal error - bad switch");
    }
}

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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [sim/] [lm32/] [traps.c] - Blame information for rev 853

Line No.	Rev	Author	Line
1	227	jeremybenn	`/* Lattice Mico32 exception and system call support.`
2			`Contributed by Jon Beniston <jon@beniston.com>`
3
4			`Copyright (C) 2009, 2010 Free Software Foundation, Inc.`
5
6			`This file is part of GDB.`
7
8			`This program 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.`
12
13			`This program 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.`
17
18			`You should have received a copy of the GNU General Public License`
19			`along with this program. If not, see <http://www.gnu.org/licenses/>. */`
20
21			`#define WANT_CPU lm32bf`
22			`#define WANT_CPU_LM32BF`
23
24			`#include "sim-main.h"`
25			`#include "lm32-sim.h"`
26			`#include "targ-vals.h"`
27
28			`/* Read memory function for system call interface. */`
29
30			`static int`
31			`syscall_read_mem (host_callback * cb, struct cb_syscall *sc,`
32			`unsigned long taddr, char *buf, int bytes)`
33			`{`
34			`SIM_DESC sd = (SIM_DESC) sc->p1;`
35			`SIM_CPU cpu = (SIM_CPU ) sc->p2;`
36
37			`return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes);`
38			`}`
39
40			`/* Write memory function for system call interface. */`
41
42			`static int`
43			`syscall_write_mem (host_callback * cb, struct cb_syscall *sc,`
44			`unsigned long taddr, const char *buf, int bytes)`
45			`{`
46			`SIM_DESC sd = (SIM_DESC) sc->p1;`
47			`SIM_CPU cpu = (SIM_CPU ) sc->p2;`
48
49			`return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes);`
50			`}`
51
52			`/* Handle invalid instructions. */`
53
54			`SEM_PC`
55			`sim_engine_invalid_insn (SIM_CPU * current_cpu, IADDR cia, SEM_PC pc)`
56			`{`
57			`SIM_DESC sd = CPU_STATE (current_cpu);`
58
59			`sim_engine_halt (sd, current_cpu, NULL, cia, sim_stopped, SIM_SIGILL);`
60
61			`return pc;`
62			`}`
63
64			`/* Handle divide instructions. */`
65
66			`USI`
67			`lm32bf_divu_insn (SIM_CPU * current_cpu, IADDR pc, USI r0, USI r1, USI r2)`
68			`{`
69			`SIM_DESC sd = CPU_STATE (current_cpu);`
70			`host_callback *cb = STATE_CALLBACK (sd);`
71
72			`/* Check for divide by zero */`
73			`if (GET_H_GR (r1) == 0)`
74			`{`
75			`if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)`
76			`sim_engine_halt (sd, current_cpu, NULL, pc, sim_stopped, SIM_SIGFPE);`
77			`else`
78			`{`
79			`/* Save PC in exception address register. */`
80			`SET_H_GR (30, pc);`
81			`/* Save and clear interrupt enable. */`
82			`SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 1) << 1);`
83			`/* Branch to divide by zero exception handler. */`
84			`return GET_H_CSR (LM32_CSR_EBA) + LM32_EID_DIVIDE_BY_ZERO * 32;`
85			`}`
86			`}`
87			`else`
88			`{`
89			`SET_H_GR (r2, (USI) GET_H_GR (r0) / (USI) GET_H_GR (r1));`
90			`return pc + 4;`
91			`}`
92			`}`
93
94			`USI`
95			`lm32bf_modu_insn (SIM_CPU * current_cpu, IADDR pc, USI r0, USI r1, USI r2)`
96			`{`
97			`SIM_DESC sd = CPU_STATE (current_cpu);`
98			`host_callback *cb = STATE_CALLBACK (sd);`
99
100			`/* Check for divide by zero. */`
101			`if (GET_H_GR (r1) == 0)`
102			`{`
103			`if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)`
104			`sim_engine_halt (sd, current_cpu, NULL, pc, sim_stopped, SIM_SIGFPE);`
105			`else`
106			`{`
107			`/* Save PC in exception address register. */`
108			`SET_H_GR (30, pc);`
109			`/* Save and clear interrupt enable. */`
110			`SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 1) << 1);`
111			`/* Branch to divide by zero exception handler. */`
112			`return GET_H_CSR (LM32_CSR_EBA) + LM32_EID_DIVIDE_BY_ZERO * 32;`
113			`}`
114			`}`
115			`else`
116			`{`
117			`SET_H_GR (r2, (USI) GET_H_GR (r0) % (USI) GET_H_GR (r1));`
118			`return pc + 4;`
119			`}`
120			`}`
121
122			`/* Handle break instructions. */`
123
124			`USI`
125			`lm32bf_break_insn (SIM_CPU * current_cpu, IADDR pc)`
126			`{`
127			`SIM_DESC sd = CPU_STATE (current_cpu);`
128			`host_callback *cb = STATE_CALLBACK (sd);`
129			`/* Breakpoint. */`
130			`if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)`
131			`{`
132			`sim_engine_halt (sd, current_cpu, NULL, pc, sim_stopped, SIM_SIGTRAP);`
133			`return pc;`
134			`}`
135			`else`
136			`{`
137			`/* Save PC in breakpoint address register. */`
138			`SET_H_GR (31, pc);`
139			`/* Save and clear interrupt enable. */`
140			`SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 1) << 2);`
141			`/* Branch to breakpoint exception handler. */`
142			`return GET_H_CSR (LM32_CSR_DEBA) + LM32_EID_BREAKPOINT * 32;`
143			`}`
144			`}`
145
146			`/* Handle scall instructions. */`
147
148			`USI`
149			`lm32bf_scall_insn (SIM_CPU * current_cpu, IADDR pc)`
150			`{`
151			`SIM_DESC sd = CPU_STATE (current_cpu);`
152			`host_callback *cb = STATE_CALLBACK (sd);`
153
154			`if ((STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)`
155			`\|\| (GET_H_GR (8) == TARGET_SYS_exit))`
156			`{`
157			`/* Delegate system call to host O/S. */`
158			`CB_SYSCALL s;`
159			`CB_SYSCALL_INIT (&s);`
160			`s.p1 = (PTR) sd;`
161			`s.p2 = (PTR) current_cpu;`
162			`s.read_mem = syscall_read_mem;`
163			`s.write_mem = syscall_write_mem;`
164			`/* Extract parameters. */`
165			`s.func = GET_H_GR (8);`
166			`s.arg1 = GET_H_GR (1);`
167			`s.arg2 = GET_H_GR (2);`
168			`s.arg3 = GET_H_GR (3);`
169			`/* Halt the simulator if the requested system call is _exit. */`
170			`if (s.func == TARGET_SYS_exit)`
171			`sim_engine_halt (sd, current_cpu, NULL, pc, sim_exited, s.arg1);`
172			`/* Perform the system call. */`
173			`cb_syscall (cb, &s);`
174			`/* Store the return value in the CPU's registers. */`
175			`SET_H_GR (1, s.result);`
176			`SET_H_GR (2, s.result2);`
177			`SET_H_GR (3, s.errcode);`
178			`/* Skip over scall instruction. */`
179			`return pc + 4;`
180			`}`
181			`else`
182			`{`
183			`/* Save PC in exception address register. */`
184			`SET_H_GR (30, pc);`
185			`/* Save and clear interrupt enable */`
186			`SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 1) << 1);`
187			`/* Branch to system call exception handler. */`
188			`return GET_H_CSR (LM32_CSR_EBA) + LM32_EID_SYSTEM_CALL * 32;`
189			`}`
190			`}`
191
192			`/* Handle b instructions. */`
193
194			`USI`
195			`lm32bf_b_insn (SIM_CPU * current_cpu, USI r0, USI f_r0)`
196			`{`
197			`SIM_DESC sd = CPU_STATE (current_cpu);`
198			`host_callback *cb = STATE_CALLBACK (sd);`
199
200			`/* Restore interrupt enable. */`
201			`if (f_r0 == 30)`
202			`SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 2) >> 1);`
203			`else if (f_r0 == 31)`
204			`SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 4) >> 2);`
205			`return r0;`
206			`}`
207
208			`/* Handle wcsr instructions. */`
209
210			`void`
211			`lm32bf_wcsr_insn (SIM_CPU * current_cpu, USI f_csr, USI r1)`
212			`{`
213			`SIM_DESC sd = CPU_STATE (current_cpu);`
214			`host_callback *cb = STATE_CALLBACK (sd);`
215
216			`/* Writing a 1 to IP CSR clears a bit, writing 0 has no effect. */`
217			`if (f_csr == LM32_CSR_IP)`
218			`SET_H_CSR (f_csr, GET_H_CSR (f_csr) & ~r1);`
219			`else`
220			`SET_H_CSR (f_csr, r1);`
221			`}`
222
223			`/* Handle signals. */`
224
225			`void`
226			`lm32_core_signal (SIM_DESC sd,`
227			`sim_cpu * cpu,`
228			`sim_cia cia,`
229			`unsigned map,`
230			`int nr_bytes,`
231			`address_word addr,`
232			`transfer_type transfer, sim_core_signals sig)`
233			`{`
234			`const char *copy = (transfer == read_transfer ? "read" : "write");`
235			`address_word ip = CIA_ADDR (cia);`
236			`SIM_CPU *current_cpu = cpu;`
237
238			`switch (sig)`
239			`{`
240			`case sim_core_unmapped_signal:`
241			`sim_io_eprintf (sd,`
242			`"core: %d byte %s to unmapped address 0x%lx at 0x%lx\n",`
243			`nr_bytes, copy, (unsigned long) addr,`
244			`(unsigned long) ip);`
245			`SET_H_GR (30, ip);`
246			`/* Save and clear interrupt enable. */`
247			`SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 1) << 1);`
248			`CIA_SET (cpu, GET_H_CSR (LM32_CSR_EBA) + LM32_EID_DATA_BUS_ERROR * 32);`
249			`sim_engine_halt (sd, cpu, NULL, LM32_EID_DATA_BUS_ERROR * 32,`
250			`sim_stopped, SIM_SIGSEGV);`
251			`break;`
252			`case sim_core_unaligned_signal:`
253			`sim_io_eprintf (sd,`
254			`"core: %d byte misaligned %s to address 0x%lx at 0x%lx\n",`
255			`nr_bytes, copy, (unsigned long) addr,`
256			`(unsigned long) ip);`
257			`SET_H_GR (30, ip);`
258			`/* Save and clear interrupt enable. */`
259			`SET_H_CSR (LM32_CSR_IE, (GET_H_CSR (LM32_CSR_IE) & 1) << 1);`
260			`CIA_SET (cpu, GET_H_CSR (LM32_CSR_EBA) + LM32_EID_DATA_BUS_ERROR * 32);`
261			`sim_engine_halt (sd, cpu, NULL, LM32_EID_DATA_BUS_ERROR * 32,`
262			`sim_stopped, SIM_SIGBUS);`
263			`break;`
264			`default:`
265			`sim_engine_abort (sd, cpu, cia,`
266			`"sim_core_signal - internal error - bad switch");`
267			`}`
268			`}`