ARM: only use one set of dummy FPA registers

[openocd] / src / target / armv4_5.c

diff --git a/src/target/armv4_5.c b/src/target/armv4_5.c
index 6f8d14cd282e104facbc8276af46a9ccc9985064..aba44319694955caf41fed9b7e7e649066ee99b3 100644 (file)
--- a/src/target/armv4_5.c
+++ b/src/target/armv4_5.c
@@ -189,30 +189,44 @@ int armv4_5_core_reg_map[7][17] =
        }
 };
 
-uint8_t armv4_5_gdb_dummy_fp_value[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+static const uint8_t arm_gdb_dummy_fp_value[12];
 
-struct reg armv4_5_gdb_dummy_fp_reg =
+/**
+ * Dummy FPA registers are required to support GDB on ARM.
+ * Register packets require eight obsolete FPA register values.
+ * Modern ARM cores use Vector Floating Point (VFP), if they
+ * have any floating point support.  VFP is not FPA-compatible.
+ */
+struct reg arm_gdb_dummy_fp_reg =
 {
-       .name = "GDB dummy floating-point register",
-       .value = armv4_5_gdb_dummy_fp_value,
-       .dirty = 0,
+       .name = "GDB dummy FPA register",
+       .value = (uint8_t *) arm_gdb_dummy_fp_value,
        .valid = 1,
        .size = 96,
-       .arch_info = NULL,
 };
 
-uint8_t armv4_5_gdb_dummy_fps_value[] = {0, 0, 0, 0};
+static const uint8_t arm_gdb_dummy_fps_value[4];
 
-struct reg armv4_5_gdb_dummy_fps_reg =
+/**
+ * Dummy FPA status registers are required to support GDB on ARM.
+ * Register packets require an obsolete FPA status register.
+ */
+struct reg arm_gdb_dummy_fps_reg =
 {
-       .name = "GDB dummy floating-point status register",
-       .value = armv4_5_gdb_dummy_fps_value,
-       .dirty = 0,
+       .name = "GDB dummy FPA status register",
+       .value = (uint8_t *) arm_gdb_dummy_fps_value,
        .valid = 1,
        .size = 32,
-       .arch_info = NULL,
 };
 
+static void arm_gdb_dummy_init(void) __attribute__ ((constructor));
+
+static void arm_gdb_dummy_init(void)
+{
+       register_init_dummy(&arm_gdb_dummy_fp_reg);
+       register_init_dummy(&arm_gdb_dummy_fps_reg);
+}
+
 int armv4_5_get_core_reg(struct reg *reg)
 {
        int retval;
@@ -313,9 +327,6 @@ struct reg_cache* armv4_5_build_reg_cache(struct target *target, struct arm *arm
        cache->reg_list = reg_list;
        cache->num_regs = num_regs;
 
-       register_init_dummy(&armv4_5_gdb_dummy_fp_reg);
-       register_init_dummy(&armv4_5_gdb_dummy_fps_reg);
-
        for (i = 0; i < 37; i++)
        {
                arch_info[i] = armv4_5_core_reg_list_arch_info[i];
@@ -550,10 +561,10 @@ int armv4_5_get_gdb_reg_list(struct target *target, struct reg **reg_list[], int
 
        for (i = 16; i < 24; i++)
        {
-               (*reg_list)[i] = &armv4_5_gdb_dummy_fp_reg;
+               (*reg_list)[i] = &arm_gdb_dummy_fp_reg;
        }
 
-       (*reg_list)[24] = &armv4_5_gdb_dummy_fps_reg;
+       (*reg_list)[24] = &arm_gdb_dummy_fps_reg;
        (*reg_list)[25] = &armv4_5->core_cache->reg_list[ARMV4_5_CPSR];
 
        return ERROR_OK;