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author | Christoph Hellwig <hch@lst.de> | 2010-03-10 23:22:50 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-12 23:52:38 (GMT) |
commit | 440e6ca79aebdc274ce4c625a6f42c8bf3c7bc91 (patch) | |
tree | ff3230d94decd47b67960134a54313706c10bfa5 /arch/arm/kernel/ptrace.c | |
parent | fd341abba65e3d93fc24c132e4c0278d18b6d2fc (diff) | |
download | linux-440e6ca79aebdc274ce4c625a6f42c8bf3c7bc91.tar.xz |
arm: use generic ptrace_resume code
Use the generic ptrace_resume code for PTRACE_SYSCALL, PTRACE_CONT,
PTRACE_KILL and PTRACE_SINGLESTEP. This implies defining
arch_has_single_step in <asm/ptrace.h> and implementing the
user_enable_single_step and user_disable_single_step functions, which also
causes the breakpoint information to be cleared on fork, which could be
considered a bug fix.
Also the TIF_SYSCALL_TRACE thread flag is now cleared on PTRACE_KILL which
it previously wasn't and the single stepping disable only happens if the
tracee process isn't a zombie yet, which is consistent with all
architectures using the modern ptrace code.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm/kernel/ptrace.c')
-rw-r--r-- | arch/arm/kernel/ptrace.c | 60 |
1 files changed, 12 insertions, 48 deletions
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c index 08f899f..3f562a7 100644 --- a/arch/arm/kernel/ptrace.c +++ b/arch/arm/kernel/ptrace.c @@ -452,12 +452,23 @@ void ptrace_cancel_bpt(struct task_struct *child) clear_breakpoint(child, &child->thread.debug.bp[i]); } +void user_disable_single_step(struct task_struct *task) +{ + task->ptrace &= ~PT_SINGLESTEP; + ptrace_cancel_bpt(task); +} + +void user_enable_single_step(struct task_struct *task) +{ + task->ptrace |= PT_SINGLESTEP; +} + /* * Called by kernel/ptrace.c when detaching.. */ void ptrace_disable(struct task_struct *child) { - single_step_disable(child); + user_disable_single_step(child); } /* @@ -753,53 +764,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) ret = ptrace_write_user(child, addr, data); break; - /* - * continue/restart and stop at next (return from) syscall - */ - case PTRACE_SYSCALL: - case PTRACE_CONT: - ret = -EIO; - if (!valid_signal(data)) - break; - if (request == PTRACE_SYSCALL) - set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); - else - clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); - child->exit_code = data; - single_step_disable(child); - wake_up_process(child); - ret = 0; - break; - - /* - * make the child exit. Best I can do is send it a sigkill. - * perhaps it should be put in the status that it wants to - * exit. - */ - case PTRACE_KILL: - single_step_disable(child); - if (child->exit_state != EXIT_ZOMBIE) { - child->exit_code = SIGKILL; - wake_up_process(child); - } - ret = 0; - break; - - /* - * execute single instruction. - */ - case PTRACE_SINGLESTEP: - ret = -EIO; - if (!valid_signal(data)) - break; - single_step_enable(child); - clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); - child->exit_code = data; - /* give it a chance to run. */ - wake_up_process(child); - ret = 0; - break; - case PTRACE_GETREGS: ret = ptrace_getregs(child, (void __user *)data); break; |