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um: use generic ptrace_resume code

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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 which is consistent with all architectures using the
modern ptrace code.

XXX: I'm not sure arch_has_single_step() is placed in the exactly correct
location, please verify in which of the ptrace headers it should really
be.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig
2010-03-10 15:22:56 -08:00
committed by Linus Torvalds
parent 55436c9165
commit 1bd0950835
2 changed files with 18 additions and 54 deletions
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2
arch/um/include/asm/ptrace-generic.h
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@@ -16,6 +16,8 @@ struct pt_regs {
struct uml_pt_regs regs;
};
#define arch_has_single_step() (1)
#define EMPTY_REGS { .regs = EMPTY_UML_PT_REGS }
#define PT_REGS_IP(r) UPT_IP(&(r)->regs)