1 files changed, 131 insertions, 0 deletions
diff --git a/target-ppc/gdbstub.c b/target-ppc/gdbstub.c
new file mode 100644
index 0000000000..1c910902ea
--- /dev/null
+++ b/target-ppc/gdbstub.c
@@ -0,0 +1,131 @@
+/*
+ * 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;
+}