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Date: Thu, 20 Dec 2007 14:16:36 +0100
From: Markus Metzger <markus.t.metzger@...el.com>
To: ak@...e.de, hpa@...or.com, linux-kernel@...r.kernel.org,
mingo@...e.hu, tglx@...utronix.de
Cc: markus.t.metzger@...el.com, markus.t.metzger@...il.com,
suresh.b.siddha@...el.com, roland@...hat.com,
akpm@...ux-foundation.org, mtk.manpages@...il.com
Subject: [patch 2/5] 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@...el.com>
---
Index: linux-2.6-x86/arch/x86/kernel/ds.c
===================================================================
--- linux-2.6-x86.orig/arch/x86/kernel/ds.c 2007-12-20 13:51:20.%N +0100
+++ linux-2.6-x86/arch/x86/kernel/ds.c 2007-12-20 13:52:01.%N +0100
@@ -111,53 +111,53 @@
* 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 @@
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 @@
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 @@
ds = kzalloc(ds_cfg.sizeof_ds, GFP_KERNEL);
if (!ds) {
- kfree(bts);
+ kfree((void *)bts);
return -ENOMEM;
}
@@ -221,7 +221,7 @@
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_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_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_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_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 @@
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 @@
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 @@
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)
Index: linux-2.6-x86/include/asm-x86/ds.h
===================================================================
--- linux-2.6-x86.orig/include/asm-x86/ds.h 2007-12-20 13:51:21.%N +0100
+++ linux-2.6-x86/include/asm-x86/ds.h 2007-12-20 13:52:01.%N +0100
@@ -39,16 +39,16 @@
};
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_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);
Index: linux-2.6-x86/include/asm-x86/ptrace-abi.h
===================================================================
--- linux-2.6-x86.orig/include/asm-x86/ptrace-abi.h 2007-12-20 13:51:22.%N +0100
+++ linux-2.6-x86/include/asm-x86/ptrace-abi.h 2007-12-20 13:52:01.%N +0100
@@ -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 */
Index: linux-2.6-x86/arch/x86/kernel/ptrace.c
===================================================================
--- linux-2.6-x86.orig/arch/x86/kernel/ptrace.c 2007-12-20 13:51:45.%N +0100
+++ linux-2.6-x86/arch/x86/kernel/ptrace.c 2007-12-20 13:52:01.%N +0100
@@ -558,7 +558,7 @@
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)))
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