1 files changed, 81 insertions, 21 deletions

diff --git a/target/i386/gdbstub.c b/target/i386/gdbstub.c
index 4acf485..04c49e8 100644
--- a/target/i386/gdbstub.c
+++ b/target/i386/gdbstub.c
@@ -18,8 +18,13 @@
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 #include "qemu/osdep.h"
+#include "accel/tcg/vcpu-state.h"
 #include "cpu.h"
+#include "exec/gdbstub.h"
 #include "gdbstub/helpers.h"
+#ifdef CONFIG_LINUX_USER
+#include "linux-user/qemu.h"
+#endif
 
 #ifdef TARGET_X86_64
 static const int gpr_map[16] = {
@@ -96,6 +101,19 @@ static int gdb_write_reg_cs64(uint32_t hflags, uint8_t *buf, target_ulong *val)
     return 4;
 }
 
+static int gdb_get_reg(CPUX86State *env, GByteArray *mem_buf, target_ulong val)
+{
+    if (TARGET_LONG_BITS == 64) {
+        if (env->hflags & HF_CS64_MASK) {
+            return gdb_get_reg64(mem_buf, val);
+        } else {
+            return gdb_get_reg64(mem_buf, val & 0xffffffffUL);
+        }
+    } else {
+        return gdb_get_reg32(mem_buf, val);
+    }
+}
+
 int x86_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
 {
     X86CPU *cpu = X86_CPU(cs);
@@ -137,15 +155,7 @@ int x86_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
     } else {
         switch (n) {
         case IDX_IP_REG:
-            if (TARGET_LONG_BITS == 64) {
-                if (env->hflags & HF_CS64_MASK) {
-                    return gdb_get_reg64(mem_buf, env->eip);
-                } else {
-                    return gdb_get_reg64(mem_buf, env->eip & 0xffffffffUL);
-                }
-            } else {
-                return gdb_get_reg32(mem_buf, env->eip);
-            }
+            return gdb_get_reg(env, mem_buf, env->eip);
         case IDX_FLAGS_REG:
             return gdb_get_reg32(mem_buf, env->eflags);
 
@@ -248,6 +258,21 @@ static int x86_cpu_gdb_load_seg(X86CPU *cpu, X86Seg sreg, uint8_t *mem_buf)
     return 4;
 }
 
+static int gdb_write_reg(CPUX86State *env, uint8_t *mem_buf, target_ulong *val)
+{
+    if (TARGET_LONG_BITS == 64) {
+        if (env->hflags & HF_CS64_MASK) {
+            *val = ldq_p(mem_buf);
+        } else {
+            *val = ldq_p(mem_buf) & 0xffffffffUL;
+        }
+        return 8;
+    } else {
+        *val = (uint32_t)ldl_p(mem_buf);
+        return 4;
+    }
+}
+
 int x86_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
 {
     X86CPU *cpu = X86_CPU(cs);
@@ -288,18 +313,7 @@ int x86_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
     } else {
         switch (n) {
         case IDX_IP_REG:
-            if (TARGET_LONG_BITS == 64) {
-                if (env->hflags & HF_CS64_MASK) {
-                    env->eip = ldq_p(mem_buf);
-                } else {
-                    env->eip = ldq_p(mem_buf) & 0xffffffffUL;
-                }
-                return 8;
-            } else {
-                env->eip &= ~0xffffffffUL;
-                env->eip |= (uint32_t)ldl_p(mem_buf);
-                return 4;
-            }
+            return gdb_write_reg(env, mem_buf, &env->eip);
         case IDX_FLAGS_REG:
             env->eflags = ldl_p(mem_buf);
             return 4;
@@ -397,3 +411,49 @@ int x86_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
     /* Unrecognised register.  */
     return 0;
 }
+
+#ifdef CONFIG_LINUX_USER
+
+#define IDX_ORIG_AX 0
+
+static int x86_cpu_gdb_read_linux_register(CPUState *cs, GByteArray *mem_buf,
+                                           int n)
+{
+    X86CPU *cpu = X86_CPU(cs);
+    CPUX86State *env = &cpu->env;
+
+    switch (n) {
+    case IDX_ORIG_AX:
+        return gdb_get_reg(env, mem_buf, get_task_state(cs)->orig_ax);
+    }
+    return 0;
+}
+
+static int x86_cpu_gdb_write_linux_register(CPUState *cs, uint8_t *mem_buf,
+                                            int n)
+{
+    X86CPU *cpu = X86_CPU(cs);
+    CPUX86State *env = &cpu->env;
+
+    switch (n) {
+    case IDX_ORIG_AX:
+        return gdb_write_reg(env, mem_buf, &get_task_state(cs)->orig_ax);
+    }
+    return 0;
+}
+
+#endif
+
+void x86_cpu_gdb_init(CPUState *cs)
+{
+#ifdef CONFIG_LINUX_USER
+    gdb_register_coprocessor(cs, x86_cpu_gdb_read_linux_register,
+                             x86_cpu_gdb_write_linux_register,
+#ifdef TARGET_X86_64
+                             gdb_find_static_feature("i386-64bit-linux.xml"),
+#else
+                             gdb_find_static_feature("i386-32bit-linux.xml"),
+#endif
+                             0);
+#endif
+}