x86, ptrace: new ptrace BTS API

[mv-sheeva.git] / arch / x86 / kernel / ds.c

diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c
index e7855def97c3e62d6a37c504d100c08ddf7005be..6eb5d49a36bb8240ab41794375e35c537c108138 100644 (file)
--- a/arch/x86/kernel/ds.c
+++ b/arch/x86/kernel/ds.c
@@ -177,18 +177,20 @@ static inline void set_info_data(char *base, unsigned long value)
 }
 
 
-int ds_allocate(void **dsp, size_t bts_size_in_records)
+int ds_allocate(void **dsp, size_t bts_size_in_bytes)
 {
-       size_t bts_size_in_bytes = 0;
-       void *bts = 0;
-       void *ds = 0;
+       size_t bts_size_in_records;
+       void *bts;
+       void *ds;
 
        if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts)
                return -EOPNOTSUPP;
 
-       if (bts_size_in_records < 0)
+       if (bts_size_in_bytes < 0)
                return -EINVAL;
 
+       bts_size_in_records =
+               bts_size_in_bytes / ds_cfg.sizeof_bts;
        bts_size_in_bytes =
                bts_size_in_records * ds_cfg.sizeof_bts;
 
@@ -233,9 +235,21 @@ int ds_get_bts_size(void *ds)
        if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts)
                return -EOPNOTSUPP;
 
+       if (!ds)
+               return 0;
+
        size_in_bytes =
                get_bts_absolute_maximum(ds) -
                get_bts_buffer_base(ds);
+       return size_in_bytes;
+}
+
+int ds_get_bts_end(void *ds)
+{
+       size_t size_in_bytes = ds_get_bts_size(ds);
+
+       if (size_in_bytes <= 0)
+               return size_in_bytes;
 
        return size_in_bytes / ds_cfg.sizeof_bts;
 }
@@ -254,6 +268,38 @@ int ds_get_bts_index(void *ds)
        return index_offset_in_bytes / ds_cfg.sizeof_bts;
 }
 
+int ds_set_overflow(void *ds, int method)
+{
+       switch (method) {
+       case DS_O_SIGNAL:
+               return -EOPNOTSUPP;
+       case DS_O_WRAP:
+               return 0;
+       default:
+               return -EINVAL;
+       }
+}
+
+int ds_get_overflow(void *ds)
+{
+       return DS_O_WRAP;
+}
+
+int ds_clear(void *ds)
+{
+       int bts_size = ds_get_bts_size(ds);
+       void *bts_base;
+
+       if (bts_size <= 0)
+               return bts_size;
+
+       bts_base = get_bts_buffer_base(ds);
+       memset(bts_base, 0, bts_size);
+
+       set_bts_index(ds, bts_base);
+       return 0;
+}
+
 int ds_read_bts(void *ds, size_t index, struct bts_struct *out)
 {
        void *bts;