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authorFrederic Weisbecker <fweisbec@gmail.com>2009-11-10 10:17:07 +0100
committerFrederic Weisbecker <fweisbec@gmail.com>2009-11-10 11:23:29 +0100
commitf60d24d2ad04977b0bd9e3eb35dba2d2fa569af9 (patch)
treeb9335a41bce33a05985634a382a5adcf837dec43 /samples
parent9f6b3c2c30cfbb1166ce7e74a8f9fd93ae19d2de (diff)
downloadlinux-linaro-f60d24d2ad04977b0bd9e3eb35dba2d2fa569af9.tar.gz
hw-breakpoints: Fix broken hw-breakpoint sample module
The hw-breakpoint sample module has been broken during the hw-breakpoint internals refactoring. Propagate the changes to it. Reported-by: "K. Prasad" <prasad@linux.vnet.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'samples')
-rw-r--r--samples/hw_breakpoint/data_breakpoint.c43
1 files changed, 24 insertions, 19 deletions
diff --git a/samples/hw_breakpoint/data_breakpoint.c b/samples/hw_breakpoint/data_breakpoint.c
index 9cbdbb871b7..5bc9819a819 100644
--- a/samples/hw_breakpoint/data_breakpoint.c
+++ b/samples/hw_breakpoint/data_breakpoint.c
@@ -27,18 +27,19 @@
#include <linux/module.h> /* Needed by all modules */
#include <linux/kernel.h> /* Needed for KERN_INFO */
#include <linux/init.h> /* Needed for the macros */
+#include <linux/kallsyms.h>
-#include <asm/hw_breakpoint.h>
+#include <linux/perf_event.h>
+#include <linux/hw_breakpoint.h>
-struct hw_breakpoint sample_hbp;
+struct perf_event **sample_hbp;
static char ksym_name[KSYM_NAME_LEN] = "pid_max";
module_param_string(ksym, ksym_name, KSYM_NAME_LEN, S_IRUGO);
MODULE_PARM_DESC(ksym, "Kernel symbol to monitor; this module will report any"
" write operations on the kernel symbol");
-void sample_hbp_handler(struct hw_breakpoint *temp, struct pt_regs
- *temp_regs)
+static void sample_hbp_handler(struct perf_event *temp, void *data)
{
printk(KERN_INFO "%s value is changed\n", ksym_name);
dump_stack();
@@ -48,30 +49,34 @@ void sample_hbp_handler(struct hw_breakpoint *temp, struct pt_regs
static int __init hw_break_module_init(void)
{
int ret;
+ unsigned long addr;
-#ifdef CONFIG_X86
- sample_hbp.info.name = ksym_name;
- sample_hbp.info.type = HW_BREAKPOINT_WRITE;
- sample_hbp.info.len = HW_BREAKPOINT_LEN_4;
-#endif /* CONFIG_X86 */
+ addr = kallsyms_lookup_name(ksym_name);
- sample_hbp.triggered = (void *)sample_hbp_handler;
+ sample_hbp = register_wide_hw_breakpoint(addr, HW_BREAKPOINT_LEN_4,
+ HW_BREAKPOINT_W | HW_BREAKPOINT_R,
+ sample_hbp_handler, true);
+ if (IS_ERR(sample_hbp)) {
+ ret = PTR_ERR(sample_hbp);
+ goto fail;
+ } else if (!sample_hbp) {
+ ret = -EINVAL;
+ goto fail;
+ }
- ret = register_kernel_hw_breakpoint(&sample_hbp);
-
- if (ret < 0) {
- printk(KERN_INFO "Breakpoint registration failed\n");
- return ret;
- } else
- printk(KERN_INFO "HW Breakpoint for %s write installed\n",
- ksym_name);
+ printk(KERN_INFO "HW Breakpoint for %s write installed\n", ksym_name);
return 0;
+
+fail:
+ printk(KERN_INFO "Breakpoint registration failed\n");
+
+ return ret;
}
static void __exit hw_break_module_exit(void)
{
- unregister_kernel_hw_breakpoint(&sample_hbp);
+ unregister_wide_hw_breakpoint(sample_hbp);
printk(KERN_INFO "HW Breakpoint for %s write uninstalled\n", ksym_name);
}