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/*
* PowerPC 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"
/* Old gdb always expects FP registers. Newer (xml-aware) gdb only
* expects whatever the target description contains. Due to a
* historical mishap the FP registers appear in between core integer
* regs and PC, MSR, CR, and so forth. We hack round this by giving the
* FP regs zero size when talking to a newer gdb.
*/
int ppc_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
{
PowerPCCPU *cpu = POWERPC_CPU(cs);
CPUPPCState *env = &cpu->env;
if (n < 32) {
/* gprs */
return gdb_get_regl(mem_buf, env->gpr[n]);
} else if (n < 64) {
/* fprs */
if (gdb_has_xml) {
return 0;
}
stfq_p(mem_buf, env->fpr[n-32]);
return 8;
} else {
switch (n) {
case 64:
return gdb_get_regl(mem_buf, env->nip);
case 65:
return gdb_get_regl(mem_buf, env->msr);
case 66:
{
uint32_t cr = 0;
int i;
for (i = 0; i < 8; i++) {
cr |= env->crf[i] << (32 - ((i + 1) * 4));
}
return gdb_get_reg32(mem_buf, cr);
}
case 67:
return gdb_get_regl(mem_buf, env->lr);
case 68:
return gdb_get_regl(mem_buf, env->ctr);
case 69:
return gdb_get_regl(mem_buf, env->xer);
case 70:
{
if (gdb_has_xml) {
return 0;
}
return gdb_get_reg32(mem_buf, env->fpscr);
}
}
}
return 0;
}
int ppc_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
{
PowerPCCPU *cpu = POWERPC_CPU(cs);
CPUPPCState *env = &cpu->env;
if (n < 32) {
/* gprs */
env->gpr[n] = ldtul_p(mem_buf);
return sizeof(target_ulong);
} else if (n < 64) {
/* fprs */
if (gdb_has_xml) {
return 0;
}
env->fpr[n-32] = ldfq_p(mem_buf);
return 8;
} else {
switch (n) {
case 64:
env->nip = ldtul_p(mem_buf);
return sizeof(target_ulong);
case 65:
ppc_store_msr(env, ldtul_p(mem_buf));
return sizeof(target_ulong);
case 66:
{
uint32_t cr = ldl_p(mem_buf);
int i;
for (i = 0; i < 8; i++) {
env->crf[i] = (cr >> (32 - ((i + 1) * 4))) & 0xF;
}
return 4;
}
case 67:
env->lr = ldtul_p(mem_buf);
return sizeof(target_ulong);
case 68:
env->ctr = ldtul_p(mem_buf);
return sizeof(target_ulong);
case 69:
env->xer = ldtul_p(mem_buf);
return sizeof(target_ulong);
case 70:
/* fpscr */
if (gdb_has_xml) {
return 0;
}
store_fpscr(env, ldtul_p(mem_buf), 0xffffffff);
return sizeof(target_ulong);
}
}
return 0;
}
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