1 files changed, 103 insertions, 0 deletions
diff --git a/include/gdbstub/helpers.h b/include/gdbstub/helpers.h
new file mode 100644
index 0000000000..c573aef2dc
--- /dev/null
+++ b/include/gdbstub/helpers.h
@@ -0,0 +1,103 @@
+/*
+ * gdbstub helpers
+ *
+ * These are all used by the various frontends and have to be host
+ * aware to ensure things are store in target order.
+ *
+ * Copyright (c) 2022 Linaro Ltd
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef _GDBSTUB_HELPERS_H_
+#define _GDBSTUB_HELPERS_H_
+
+#ifdef NEED_CPU_H
+#include "cpu.h"
+
+/*
+ * The GDB remote protocol transfers values in target byte order. As
+ * the gdbstub may be batching up several register values we always
+ * append to the array.
+ */
+
+static inline int gdb_get_reg8(GByteArray *buf, uint8_t val)
+{
+    g_byte_array_append(buf, &val, 1);
+    return 1;
+}
+
+static inline int gdb_get_reg16(GByteArray *buf, uint16_t val)
+{
+    uint16_t to_word = tswap16(val);
+    g_byte_array_append(buf, (uint8_t *) &to_word, 2);
+    return 2;
+}
+
+static inline int gdb_get_reg32(GByteArray *buf, uint32_t val)
+{
+    uint32_t to_long = tswap32(val);
+    g_byte_array_append(buf, (uint8_t *) &to_long, 4);
+    return 4;
+}
+
+static inline int gdb_get_reg64(GByteArray *buf, uint64_t val)
+{
+    uint64_t to_quad = tswap64(val);
+    g_byte_array_append(buf, (uint8_t *) &to_quad, 8);
+    return 8;
+}
+
+static inline int gdb_get_reg128(GByteArray *buf, uint64_t val_hi,
+                                 uint64_t val_lo)
+{
+    uint64_t to_quad;
+#if TARGET_BIG_ENDIAN
+    to_quad = tswap64(val_hi);
+    g_byte_array_append(buf, (uint8_t *) &to_quad, 8);
+    to_quad = tswap64(val_lo);
+    g_byte_array_append(buf, (uint8_t *) &to_quad, 8);
+#else
+    to_quad = tswap64(val_lo);
+    g_byte_array_append(buf, (uint8_t *) &to_quad, 8);
+    to_quad = tswap64(val_hi);
+    g_byte_array_append(buf, (uint8_t *) &to_quad, 8);
+#endif
+    return 16;
+}
+
+static inline int gdb_get_zeroes(GByteArray *array, size_t len)
+{
+    guint oldlen = array->len;
+    g_byte_array_set_size(array, oldlen + len);
+    memset(array->data + oldlen, 0, len);
+
+    return len;
+}
+
+/**
+ * gdb_get_reg_ptr: get pointer to start of last element
+ * @len: length of element
+ *
+ * This is a helper function to extract the pointer to the last
+ * element for additional processing. Some front-ends do additional
+ * dynamic swapping of the elements based on CPU state.
+ */
+static inline uint8_t *gdb_get_reg_ptr(GByteArray *buf, int len)
+{
+    return buf->data + buf->len - len;
+}
+
+#if TARGET_LONG_BITS == 64
+#define gdb_get_regl(buf, val) gdb_get_reg64(buf, val)
+#define ldtul_p(addr) ldq_p(addr)
+#else
+#define gdb_get_regl(buf, val) gdb_get_reg32(buf, val)
+#define ldtul_p(addr) ldl_p(addr)
+#endif
+
+#else
+#error "gdbstub helpers should only be included by target specific code"
+#endif
+
+#endif /* _GDBSTUB_HELPERS_H_ */