Add GDB stub code

1 files changed, 129 insertions, 0 deletions

diff --git a/gdbstub_sys.h b/gdbstub_sys.h
new file mode 100644
index 0000000..dd82b1f
--- /dev/null
+++ b/gdbstub_sys.h
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2016  Matt Borgerson
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/* Define the size_t type */
+#define DBG_DEFINE_SIZET 1
+
+/* Define required standard integer types (e.g. uint16_t) */
+#define DBG_DEFINE_STDINT 1
+
+/*****************************************************************************
+ * Types
+ ****************************************************************************/
+
+#if DBG_DEFINE_STDINT
+typedef unsigned char  uint8_t;
+typedef unsigned short uint16_t;
+typedef unsigned long  uint32_t;
+#endif
+
+#if DBG_DEFINE_SIZET
+typedef unsigned int size_t;
+#endif
+
+typedef unsigned int address;
+typedef unsigned int reg;
+
+#pragma pack(1)
+struct dbg_interrupt_state {
+	uint32_t ss;
+	uint32_t gs;
+	uint32_t fs;
+	uint32_t es;
+	uint32_t ds;
+	uint32_t edi;
+	uint32_t esi;
+	uint32_t ebp;
+	uint32_t esp;
+	uint32_t ebx;
+	uint32_t edx;
+	uint32_t ecx;
+	uint32_t eax;
+	uint32_t vector;
+	uint32_t error_code;
+	uint32_t eip;
+	uint32_t cs;
+	uint32_t eflags;
+};
+#pragma pack()
+
+#pragma pack(1)
+struct dbg_idtr
+{
+	uint16_t len;
+	uint32_t offset;
+};
+#pragma pack()
+
+#pragma pack(1)
+struct dbg_idt_gate
+{
+	uint16_t offset_low;
+	uint16_t segment;
+	uint16_t flags;
+	uint16_t offset_high;
+};
+#pragma pack()
+
+enum DBG_REGISTER {
+	DBG_CPU_I386_REG_EAX       = 0,
+	DBG_CPU_I386_REG_ECX       = 1,
+	DBG_CPU_I386_REG_EDX       = 2,
+	DBG_CPU_I386_REG_EBX       = 3,
+	DBG_CPU_I386_REG_ESP       = 4,
+	DBG_CPU_I386_REG_EBP       = 5,
+	DBG_CPU_I386_REG_ESI       = 6,
+	DBG_CPU_I386_REG_EDI       = 7,
+	DBG_CPU_I386_REG_PC        = 8,
+	DBG_CPU_I386_REG_PS        = 9,
+	DBG_CPU_I386_REG_CS        = 10,
+	DBG_CPU_I386_REG_SS        = 11,
+	DBG_CPU_I386_REG_DS        = 12,
+	DBG_CPU_I386_REG_ES        = 13,
+	DBG_CPU_I386_REG_FS        = 14,
+	DBG_CPU_I386_REG_GS        = 15,
+	DBG_CPU_I386_NUM_REGISTERS = 16
+};
+
+struct dbg_state {
+	int signum;
+	reg registers[DBG_CPU_I386_NUM_REGISTERS];
+};
+
+/*****************************************************************************
+ * Const Data
+ ****************************************************************************/
+
+extern void const * const dbg_int_handlers[];
+
+/*****************************************************************************
+ * Prototypes
+ ****************************************************************************/
+
+int dbg_hook_idt(uint8_t vector, const void *function);
+int dbg_init_gates();
+int dbg_init_idt(void);
+int dbg_load_idt(struct dbg_idtr *idtr);
+int dbg_store_idt(struct dbg_idtr *idtr);
+uint32_t dbg_get_cs();
+void dbg_int_handler(struct dbg_interrupt_state *istate);
+void dbg_interrupt(struct dbg_interrupt_state *istate);
+void dbg_start(void);
+void dbg_io_write_8(uint16_t port, uint8_t val);
+uint8_t dbg_io_read_8(uint16_t port);
+void *dbg_sys_memset(void *ptr, int data, size_t len);
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