gdbstub: x86: Support for setting segment registers

[qemu] / target-i386 / helper.c

diff --git a/target-i386/helper.c b/target-i386/helper.c
index ce5346c..18c4bef 100644 (file)
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -1782,6 +1782,36 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
     }
 }
 
+
+int cpu_x86_get_descr_debug(CPUX86State *env, unsigned int selector,
+                            target_ulong *base, unsigned int *limit,
+                            unsigned int *flags)
+{
+    SegmentCache *dt;
+    target_ulong ptr;
+    uint32_t e1, e2;
+    int index;
+
+    if (selector & 0x4)
+        dt = &env->ldt;
+    else
+        dt = &env->gdt;
+    index = selector & ~7;
+    ptr = dt->base + index;
+    if ((index + 7) > dt->limit
+        || cpu_memory_rw_debug(env, ptr, (uint8_t *)&e1, sizeof(e1), 0) != 0
+        || cpu_memory_rw_debug(env, ptr+4, (uint8_t *)&e2, sizeof(e2), 0) != 0)
+        return 0;
+
+    *base = ((e1 >> 16) | ((e2 & 0xff) << 16) | (e2 & 0xff000000));
+    *limit = (e1 & 0xffff) | (e2 & 0x000f0000);
+    if (e2 & DESC_G_MASK)
+        *limit = (*limit << 12) | 0xfff;
+    *flags = e2;
+
+    return 1;
+}
+
 CPUX86State *cpu_x86_init(const char *cpu_model)
 {
     CPUX86State *env;