x86, ptrace: support 32bit-cross-64bit BTS recording

Support BTS recording of 32bit and 64bit tasks from 32bit or 64bit tasks.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c
index 6eb5d49..1c5ca4d 100644 (file)
--- a/arch/x86/kernel/ds.c
+++ b/arch/x86/kernel/ds.c
@@ -111,53 +111,53 @@ static struct ds_configuration ds_cfg;
  * Accessor functions for some DS and BTS fields using the above
  * global ptrace_bts_cfg.
  */
-static inline void *get_bts_buffer_base(char *base)
+static inline unsigned long get_bts_buffer_base(char *base)
 {
-       return *(void **)(base + ds_cfg.bts_buffer_base.offset);
+       return *(unsigned long *)(base + ds_cfg.bts_buffer_base.offset);
 }
-static inline void set_bts_buffer_base(char *base, void *value)
+static inline void set_bts_buffer_base(char *base, unsigned long value)
 {
-       (*(void **)(base + ds_cfg.bts_buffer_base.offset)) = value;
+       (*(unsigned long *)(base + ds_cfg.bts_buffer_base.offset)) = value;
 }
-static inline void *get_bts_index(char *base)
+static inline unsigned long get_bts_index(char *base)
 {
-       return *(void **)(base + ds_cfg.bts_index.offset);
+       return *(unsigned long *)(base + ds_cfg.bts_index.offset);
 }
-static inline void set_bts_index(char *base, void *value)
+static inline void set_bts_index(char *base, unsigned long value)
 {
-       (*(void **)(base + ds_cfg.bts_index.offset)) = value;
+       (*(unsigned long *)(base + ds_cfg.bts_index.offset)) = value;
 }
-static inline void *get_bts_absolute_maximum(char *base)
+static inline unsigned long get_bts_absolute_maximum(char *base)
 {
-       return *(void **)(base + ds_cfg.bts_absolute_maximum.offset);
+       return *(unsigned long *)(base + ds_cfg.bts_absolute_maximum.offset);
 }
-static inline void set_bts_absolute_maximum(char *base, void *value)
+static inline void set_bts_absolute_maximum(char *base, unsigned long value)
 {
-       (*(void **)(base + ds_cfg.bts_absolute_maximum.offset)) = value;
+       (*(unsigned long *)(base + ds_cfg.bts_absolute_maximum.offset)) = value;
 }
-static inline void *get_bts_interrupt_threshold(char *base)
+static inline unsigned long get_bts_interrupt_threshold(char *base)
 {
-       return *(void **)(base + ds_cfg.bts_interrupt_threshold.offset);
+       return *(unsigned long *)(base + ds_cfg.bts_interrupt_threshold.offset);
 }
-static inline void set_bts_interrupt_threshold(char *base, void *value)
+static inline void set_bts_interrupt_threshold(char *base, unsigned long value)
 {
-       (*(void **)(base + ds_cfg.bts_interrupt_threshold.offset)) = value;
+       (*(unsigned long *)(base + ds_cfg.bts_interrupt_threshold.offset)) = value;
 }
-static inline long get_from_ip(char *base)
+static inline unsigned long get_from_ip(char *base)
 {
-       return *(long *)(base + ds_cfg.from_ip.offset);
+       return *(unsigned long *)(base + ds_cfg.from_ip.offset);
 }
-static inline void set_from_ip(char *base, long value)
+static inline void set_from_ip(char *base, unsigned long value)
 {
-       (*(long *)(base + ds_cfg.from_ip.offset)) = value;
+       (*(unsigned long *)(base + ds_cfg.from_ip.offset)) = value;
 }
-static inline long get_to_ip(char *base)
+static inline unsigned long get_to_ip(char *base)
 {
-       return *(long *)(base + ds_cfg.to_ip.offset);
+       return *(unsigned long *)(base + ds_cfg.to_ip.offset);
 }
-static inline void set_to_ip(char *base, long value)
+static inline void set_to_ip(char *base, unsigned long value)
 {
-       (*(long *)(base + ds_cfg.to_ip.offset)) = value;
+       (*(unsigned long *)(base + ds_cfg.to_ip.offset)) = value;
 }
 static inline unsigned char get_info_type(char *base)
 {
@@ -180,7 +180,7 @@ static inline void set_info_data(char *base, unsigned long value)
 int ds_allocate(void **dsp, size_t bts_size_in_bytes)
 {
        size_t bts_size_in_records;
-       void *bts;
+       unsigned long bts;
        void *ds;
 
        if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts)
@@ -197,7 +197,7 @@ int ds_allocate(void **dsp, size_t bts_size_in_bytes)
        if (bts_size_in_bytes <= 0)
                return -EINVAL;
 
-       bts = kzalloc(bts_size_in_bytes, GFP_KERNEL);
+       bts = (unsigned long)kzalloc(bts_size_in_bytes, GFP_KERNEL);
 
        if (!bts)
                return -ENOMEM;
@@ -205,7 +205,7 @@ int ds_allocate(void **dsp, size_t bts_size_in_bytes)
        ds = kzalloc(ds_cfg.sizeof_ds, GFP_KERNEL);
 
        if (!ds) {
-               kfree(bts);
+               kfree((void *)bts);
                return -ENOMEM;
        }
 
@@ -221,7 +221,7 @@ int ds_allocate(void **dsp, size_t bts_size_in_bytes)
 int ds_free(void **dsp)
 {
        if (*dsp)
-               kfree(get_bts_buffer_base(*dsp));
+               kfree((void *)get_bts_buffer_base(*dsp));
        kfree(*dsp);
        *dsp = 0;
 
@@ -230,7 +230,7 @@ int ds_free(void **dsp)
 
 int ds_get_bts_size(void *ds)
 {
-       size_t size_in_bytes;
+       int size_in_bytes;
 
        if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts)
                return -EOPNOTSUPP;
@@ -246,7 +246,7 @@ int ds_get_bts_size(void *ds)
 
 int ds_get_bts_end(void *ds)
 {
-       size_t size_in_bytes = ds_get_bts_size(ds);
+       int size_in_bytes = ds_get_bts_size(ds);
 
        if (size_in_bytes <= 0)
                return size_in_bytes;
@@ -256,7 +256,7 @@ int ds_get_bts_end(void *ds)
 
 int ds_get_bts_index(void *ds)
 {
-       size_t index_offset_in_bytes;
+       int index_offset_in_bytes;
 
        if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts)
                return -EOPNOTSUPP;
@@ -288,19 +288,19 @@ int ds_get_overflow(void *ds)
 int ds_clear(void *ds)
 {
        int bts_size = ds_get_bts_size(ds);
-       void *bts_base;
+       unsigned long bts_base;
 
        if (bts_size <= 0)
                return bts_size;
 
        bts_base = get_bts_buffer_base(ds);
-       memset(bts_base, 0, bts_size);
+       memset((void *)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)
+int ds_read_bts(void *ds, int index, struct bts_struct *out)
 {
        void *bts;
 
@@ -313,8 +313,7 @@ int ds_read_bts(void *ds, size_t index, struct bts_struct *out)
        if (index >= ds_get_bts_size(ds))
                return -EINVAL;
 
-       bts = get_bts_buffer_base(ds);
-       bts = (char *)bts + (index * ds_cfg.sizeof_bts);
+       bts = (void *)(get_bts_buffer_base(ds) + (index * ds_cfg.sizeof_bts));
 
        memset(out, 0, sizeof(*out));
        if (get_from_ip(bts) == BTS_ESCAPE_ADDRESS) {
@@ -326,12 +325,12 @@ int ds_read_bts(void *ds, size_t index, struct bts_struct *out)
                out->variant.lbr.to_ip   = get_to_ip(bts);
        }
 
-       return 0;
+       return sizeof(*out);;
 }
 
 int ds_write_bts(void *ds, const struct bts_struct *in)
 {
-       void *bts;
+       unsigned long bts;
 
        if (!ds_cfg.sizeof_ds || !ds_cfg.sizeof_bts)
                return -EOPNOTSUPP;
@@ -341,33 +340,33 @@ int ds_write_bts(void *ds, const struct bts_struct *in)
 
        bts = get_bts_index(ds);
 
-       memset(bts, 0, ds_cfg.sizeof_bts);
+       memset((void *)bts, 0, ds_cfg.sizeof_bts);
        switch (in->qualifier) {
        case BTS_INVALID:
                break;
 
        case BTS_BRANCH:
-               set_from_ip(bts, in->variant.lbr.from_ip);
-               set_to_ip(bts, in->variant.lbr.to_ip);
+               set_from_ip((void *)bts, in->variant.lbr.from_ip);
+               set_to_ip((void *)bts, in->variant.lbr.to_ip);
                break;
 
        case BTS_TASK_ARRIVES:
        case BTS_TASK_DEPARTS:
-               set_from_ip(bts, BTS_ESCAPE_ADDRESS);
-               set_info_type(bts, in->qualifier);
-               set_info_data(bts, in->variant.jiffies);
+               set_from_ip((void *)bts, BTS_ESCAPE_ADDRESS);
+               set_info_type((void *)bts, in->qualifier);
+               set_info_data((void *)bts, in->variant.jiffies);
                break;
 
        default:
                return -EINVAL;
        }
 
-       bts = (char *)bts + ds_cfg.sizeof_bts;
+       bts = bts + ds_cfg.sizeof_bts;
        if (bts >= get_bts_absolute_maximum(ds))
                bts = get_bts_buffer_base(ds);
        set_bts_index(ds, bts);
 
-       return 0;
+       return ds_cfg.sizeof_bts;
 }
 
 unsigned long ds_debugctl_mask(void)

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 88ed1e7..236528b 100644 (file)
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -558,7 +558,7 @@ static int ptrace_bts_read_record(struct task_struct *child,
 
        retval = ds_read_bts((void *)child->thread.ds_area_msr,
                             bts_index, &ret);
-       if (retval)
+       if (retval < 0)
                return retval;
 
        if (copy_to_user(out, &ret, sizeof(ret)))

diff --git a/include/asm-x86/ds.h b/include/asm-x86/ds.h
index b84040a..7881368 100644 (file)
--- a/include/asm-x86/ds.h
+++ b/include/asm-x86/ds.h
@@ -39,16 +39,16 @@ enum bts_qualifier {
 };
 
 struct bts_struct {
-       enum bts_qualifier qualifier;
+       u64 qualifier;
        union {
                /* BTS_BRANCH */
                struct {
-                       long from_ip;
-                       long to_ip;
+                       u64 from_ip;
+                       u64 to_ip;
                } lbr;
                /* BTS_TASK_ARRIVES or
                   BTS_TASK_DEPARTS */
-               unsigned long jiffies;
+               u64 jiffies;
        } variant;
 };
 
@@ -64,7 +64,7 @@ extern int ds_get_bts_index(void *);
 extern int ds_set_overflow(void *, int);
 extern int ds_get_overflow(void *);
 extern int ds_clear(void *);
-extern int ds_read_bts(void *, size_t, struct bts_struct *);
+extern int ds_read_bts(void *, int, struct bts_struct *);
 extern int ds_write_bts(void *, const struct bts_struct *);
 extern unsigned long ds_debugctl_mask(void);
 extern void __cpuinit ds_init_intel(struct cpuinfo_x86 *c);

diff --git a/include/asm-x86/ptrace-abi.h b/include/asm-x86/ptrace-abi.h
index cf2fe46..32fe137 100644 (file)
--- a/include/asm-x86/ptrace-abi.h
+++ b/include/asm-x86/ptrace-abi.h
@@ -85,9 +85,9 @@
 */
 struct ptrace_bts_config {
        /* requested or actual size of BTS buffer in bytes */
-       unsigned long size;
+       unsigned int size;
        /* bitmask of below flags */
-       unsigned long flags;
+       unsigned int flags;
 };
 
 #define PTRACE_BTS_O_TRACE     0x1 /* branch trace */