[Qemu-ppc] [PATCH 1/3] target/ppc: Add SPRs XML generation code for gdbstub

[Fabiano Rosas]

A following patch will add support for handling the Special Purpose
Registers (SPR) in GDB via gdbstub. For that purpose, GDB needs to be
provided with an XML description of the registers (see gdb-xml
directory).

This patch adds the code that generates the XML dynamically based on
the SPRs already defined in the machine. This eliminates the need for
several XML files to match each possible ppc machine.

A "group" is defined so that the GDB command `info registers spr` can
be used.

Signed-off-by: Fabiano Rosas <address@hidden>
---
 target/ppc/cpu.h     |  7 +++++++
 target/ppc/gdbstub.c | 45 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index d5f99f1fc7..365bca2248 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -1052,6 +1052,9 @@ struct CPUPPCState {
     /* Special purpose registers */
     target_ulong spr[1024];
     ppc_spr_t spr_cb[1024];
+#if !defined(CONFIG_USER_ONLY)
+    const char *gdb_spr_xml;
+#endif
     /* Altivec registers */
     ppc_avr_t avr[32];
     uint32_t vscr;
@@ -1264,6 +1267,10 @@ int ppc_cpu_gdb_read_register(CPUState *cpu, uint8_t 
*buf, int reg);
 int ppc_cpu_gdb_read_register_apple(CPUState *cpu, uint8_t *buf, int reg);
 int ppc_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 int ppc_cpu_gdb_write_register_apple(CPUState *cpu, uint8_t *buf, int reg);
+#ifndef CONFIG_USER_ONLY
+int ppc_gdb_gen_spr_xml(CPUState *cpu);
+const char *ppc_gdb_get_dynamic_xml(CPUState *cs, const char *xml_name);
+#endif
 int ppc64_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
                                int cpuid, void *opaque);
 int ppc32_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs,
diff --git a/target/ppc/gdbstub.c b/target/ppc/gdbstub.c
index b6f6693583..82db500457 100644
--- a/target/ppc/gdbstub.c
+++ b/target/ppc/gdbstub.c
@@ -319,3 +319,48 @@ int ppc_cpu_gdb_write_register_apple(CPUState *cs, uint8_t 
*mem_buf, int n)
     }
     return r;
 }
+
+#ifndef CONFIG_USER_ONLY
+int ppc_gdb_gen_spr_xml(CPUState *cs)
+{
+    PowerPCCPU *cpu = POWERPC_CPU(cs);
+    CPUPPCState *env = &cpu->env;
+    GString *s = g_string_new(NULL);
+    int num_regs = 0;
+    int i;
+
+    g_string_printf(s, "<?xml version=\"1.0\"?>");
+    g_string_append_printf(s, "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">");
+    g_string_append_printf(s, "<feature name=\"org.qemu.power.spr\">");
+
+    for (i = 0; i < ARRAY_SIZE(env->spr_cb); i++) {
+        ppc_spr_t *spr = &env->spr_cb[i];
+
+        if (!spr->name) {
+            continue;
+        }
+
+        g_string_append_printf(s, "<reg name=\"%s\"",
+                               g_ascii_strdown(spr->name, -1));
+        g_string_append_printf(s, " bitsize=\"%d\"", TARGET_LONG_BITS);
+        g_string_append_printf(s, " group=\"spr\"/>");
+
+        num_regs++;
+    }
+
+    g_string_append_printf(s, "</feature>");
+    env->gdb_spr_xml = g_string_free(s, false);
+    return num_regs;
+}
+
+const char *ppc_gdb_get_dynamic_xml(CPUState *cs, const char *xml_name)
+{
+    PowerPCCPU *cpu = POWERPC_CPU(cs);
+    CPUPPCState *env = &cpu->env;
+
+    if (strcmp(xml_name, "power-spr.xml") == 0) {
+        return env->gdb_spr_xml;
+    }
+    return NULL;
+}
+#endif
--
2.17.1