target/arm: Add the XML dynamic generation

Generate an XML description for the cp-regs.
Register these regs with the gdb_register_coprocessor().
Add arm_gdb_get_sysreg() to use it as a callback to read those regs.
Add a dummy arm_gdb_set_sysreg().

Signed-off-by: Abdallah Bouassida <abdallah.bouassida@lauterbach.com>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 1524153386-3550-4-git-send-email-abdallah.bouassida@lauterbach.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index c78ccabded..01281f5c56 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -133,6 +133,19 @@ enum {
    s<2n+1> maps to the most significant half of d<n>
  */
 
+/**
+ * DynamicGDBXMLInfo:
+ * @desc: Contains the XML descriptions.
+ * @num_cpregs: Number of the Coprocessor registers seen by GDB.
+ * @cpregs_keys: Array that contains the corresponding Key of
+ * a given cpreg with the same order of the cpreg in the XML description.
+ */
+typedef struct DynamicGDBXMLInfo {
+    char *desc;
+    int num_cpregs;
+    uint32_t *cpregs_keys;
+} DynamicGDBXMLInfo;
+
 /* CPU state for each instance of a generic timer (in cp15 c14) */
 typedef struct ARMGenericTimer {
     uint64_t cval; /* Timer CompareValue register */
@@ -687,6 +700,8 @@ struct ARMCPU {
     uint64_t *cpreg_vmstate_values;
     int32_t cpreg_vmstate_array_len;
 
+    DynamicGDBXMLInfo dyn_xml;
+
     /* Timers used by the generic (architected) timer */
     QEMUTimer *gt_timer[NUM_GTIMERS];
     /* GPIO outputs for generic timer */
@@ -868,6 +883,17 @@ hwaddr arm_cpu_get_phys_page_attrs_debug(CPUState *cpu, vaddr addr,
 int arm_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
 int arm_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 
+/* Dynamically generates for gdb stub an XML description of the sysregs from
+ * the cp_regs hashtable. Returns the registered sysregs number.
+ */
+int arm_gen_dynamic_xml(CPUState *cpu);
+
+/* Returns the dynamically generated XML for the gdb stub.
+ * Returns a pointer to the XML contents for the specified XML file or NULL
+ * if the XML name doesn't match the predefined one.
+ */
+const char *arm_gdb_get_dynamic_xml(CPUState *cpu, const char *xmlname);
+
 int arm_cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cs,
                              int cpuid, void *opaque);
 int arm_cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cs,