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/*
* MIPS gdb server stub
*
* Copyright (c) 2003-2005 Fabrice Bellard
* Copyright (c) 2013 SUSE LINUX Products GmbH
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "qemu-common.h"
#include "exec/gdbstub.h"
int mips_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
{
MIPSCPU *cpu = MIPS_CPU(cs);
CPUMIPSState *env = &cpu->env;
if (n < 32) {
return gdb_get_regl(mem_buf, env->active_tc.gpr[n]);
}
if (env->CP0_Config1 & (1 << CP0C1_FP)) {
if (n >= 38 && n < 70) {
if (env->CP0_Status & (1 << CP0St_FR)) {
return gdb_get_regl(mem_buf,
env->active_fpu.fpr[n - 38].d);
} else {
return gdb_get_regl(mem_buf,
env->active_fpu.fpr[n - 38].w[FP_ENDIAN_IDX]);
}
}
switch (n) {
case 70:
return gdb_get_regl(mem_buf, (int32_t)env->active_fpu.fcr31);
case 71:
return gdb_get_regl(mem_buf, (int32_t)env->active_fpu.fcr0);
}
}
switch (n) {
case 32:
return gdb_get_regl(mem_buf, (int32_t)env->CP0_Status);
case 33:
return gdb_get_regl(mem_buf, env->active_tc.LO[0]);
case 34:
return gdb_get_regl(mem_buf, env->active_tc.HI[0]);
case 35:
return gdb_get_regl(mem_buf, env->CP0_BadVAddr);
case 36:
return gdb_get_regl(mem_buf, (int32_t)env->CP0_Cause);
case 37:
return gdb_get_regl(mem_buf, env->active_tc.PC |
!!(env->hflags & MIPS_HFLAG_M16));
case 72:
return gdb_get_regl(mem_buf, 0); /* fp */
case 89:
return gdb_get_regl(mem_buf, (int32_t)env->CP0_PRid);
}
if (n >= 73 && n <= 88) {
/* 16 embedded regs. */
return gdb_get_regl(mem_buf, 0);
}
return 0;
}
/* convert MIPS rounding mode in FCR31 to IEEE library */
static unsigned int ieee_rm[] = {
float_round_nearest_even,
float_round_to_zero,
float_round_up,
float_round_down
};
#define RESTORE_ROUNDING_MODE \
set_float_rounding_mode(ieee_rm[env->active_fpu.fcr31 & 3], \
&env->active_fpu.fp_status)
int mips_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
{
MIPSCPU *cpu = MIPS_CPU(cs);
CPUMIPSState *env = &cpu->env;
target_ulong tmp;
tmp = ldtul_p(mem_buf);
if (n < 32) {
env->active_tc.gpr[n] = tmp;
return sizeof(target_ulong);
}
if (env->CP0_Config1 & (1 << CP0C1_FP)
&& n >= 38 && n < 73) {
if (n < 70) {
if (env->CP0_Status & (1 << CP0St_FR)) {
env->active_fpu.fpr[n - 38].d = tmp;
} else {
env->active_fpu.fpr[n - 38].w[FP_ENDIAN_IDX] = tmp;
}
}
switch (n) {
case 70:
env->active_fpu.fcr31 = tmp & 0xFF83FFFF;
/* set rounding mode */
RESTORE_ROUNDING_MODE;
break;
case 71:
env->active_fpu.fcr0 = tmp;
break;
}
return sizeof(target_ulong);
}
switch (n) {
case 32:
env->CP0_Status = tmp;
break;
case 33:
env->active_tc.LO[0] = tmp;
break;
case 34:
env->active_tc.HI[0] = tmp;
break;
case 35:
env->CP0_BadVAddr = tmp;
break;
case 36:
env->CP0_Cause = tmp;
break;
case 37:
env->active_tc.PC = tmp & ~(target_ulong)1;
if (tmp & 1) {
env->hflags |= MIPS_HFLAG_M16;
} else {
env->hflags &= ~(MIPS_HFLAG_M16);
}
break;
case 72: /* fp, ignored */
break;
default:
if (n > 89) {
return 0;
}
/* Other registers are readonly. Ignore writes. */
break;
}
return sizeof(target_ulong);
}
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