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-rw-r--r--target-arm/gdbstub.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/target-arm/gdbstub.c b/target-arm/gdbstub.c
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+/*
+ * ARM 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 expect FPA registers. Newer (xml-aware) gdb only expect
+ whatever the target description contains. Due to a historical mishap
+ the FPA registers appear in between core integer regs and the CPSR.
+ We hack round this by giving the FPA regs zero size when talking to a
+ newer gdb. */
+
+int arm_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+
+ if (n < 16) {
+ /* Core integer register. */
+ return gdb_get_reg32(mem_buf, env->regs[n]);
+ }
+ if (n < 24) {
+ /* FPA registers. */
+ if (gdb_has_xml) {
+ return 0;
+ }
+ memset(mem_buf, 0, 12);
+ return 12;
+ }
+ switch (n) {
+ case 24:
+ /* FPA status register. */
+ if (gdb_has_xml) {
+ return 0;
+ }
+ return gdb_get_reg32(mem_buf, 0);
+ case 25:
+ /* CPSR */
+ return gdb_get_reg32(mem_buf, cpsr_read(env));
+ }
+ /* Unknown register. */
+ return 0;
+}
+
+int arm_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
+{
+ ARMCPU *cpu = ARM_CPU(cs);
+ CPUARMState *env = &cpu->env;
+ uint32_t tmp;
+
+ tmp = ldl_p(mem_buf);
+
+ /* Mask out low bit of PC to workaround gdb bugs. This will probably
+ cause problems if we ever implement the Jazelle DBX extensions. */
+ if (n == 15) {
+ tmp &= ~1;
+ }
+
+ if (n < 16) {
+ /* Core integer register. */
+ env->regs[n] = tmp;
+ return 4;
+ }
+ if (n < 24) { /* 16-23 */
+ /* FPA registers (ignored). */
+ if (gdb_has_xml) {
+ return 0;
+ }
+ return 12;
+ }
+ switch (n) {
+ case 24:
+ /* FPA status register (ignored). */
+ if (gdb_has_xml) {
+ return 0;
+ }
+ return 4;
+ case 25:
+ /* CPSR */
+ cpsr_write(env, tmp, 0xffffffff);
+ return 4;
+ }
+ /* Unknown register. */
+ return 0;
+}