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| author | Will Deacon <will.deacon@arm.com> | 2010-09-03 10:42:55 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-09-08 10:05:00 +0100 |
| commit | 864232fa1a2f8dfe003438ef0851a56722740f3e (patch) | |
| tree | 0f85f2b1b2f030e7c51f0c69b112dea746b3a861 /arch/arm/kernel/process.c | |
| parent | f81ef4a920c8e1af75adf9f15042c2daa49d3cb3 (diff) | |
| download | lwn-864232fa1a2f8dfe003438ef0851a56722740f3e.tar.gz lwn-864232fa1a2f8dfe003438ef0851a56722740f3e.zip | |
ARM: 6357/1: hw-breakpoint: add new ptrace requests for hw-breakpoint interaction
For debuggers to take advantage of the hw-breakpoint framework in the kernel,
it is necessary to expose the API calls via a ptrace interface.
This patch exposes the hardware breakpoints framework as a collection of
virtual registers, accesible using PTRACE_SETHBPREGS and PTRACE_GETHBPREGS
requests. The breakpoints are stored in the debug_info struct of the running
thread.
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: S. Karthikeyan <informkarthik@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/process.c')
| -rw-r--r-- | arch/arm/kernel/process.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c index 401e38be1f78..974af1c3eb1d 100644 --- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c @@ -29,6 +29,7 @@ #include <linux/utsname.h> #include <linux/uaccess.h> #include <linux/random.h> +#include <linux/hw_breakpoint.h> #include <asm/cacheflush.h> #include <asm/leds.h> @@ -317,6 +318,8 @@ void flush_thread(void) struct thread_info *thread = current_thread_info(); struct task_struct *tsk = current; + flush_ptrace_hw_breakpoint(tsk); + memset(thread->used_cp, 0, sizeof(thread->used_cp)); memset(&tsk->thread.debug, 0, sizeof(struct debug_info)); memset(&thread->fpstate, 0, sizeof(union fp_state)); @@ -345,6 +348,8 @@ copy_thread(unsigned long clone_flags, unsigned long stack_start, thread->cpu_context.sp = (unsigned long)childregs; thread->cpu_context.pc = (unsigned long)ret_from_fork; + clear_ptrace_hw_breakpoint(p); + if (clone_flags & CLONE_SETTLS) thread->tp_value = regs->ARM_r3; |