x86 ptrace: unify syscall tracing

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This unifies and cleans up the syscall tracing code on i386 and x86_64.

Using a single function for entry and exit tracing on 32-bit made the
do_syscall_trace() into some terrible spaghetti.  The logic is clear and
simple using separate syscall_trace_enter() and syscall_trace_leave()
functions as on 64-bit.

The unification adds PTRACE_SYSEMU and PTRACE_SYSEMU_SINGLESTEP support
on x86_64, for 32-bit ptrace() callers and for 64-bit ptrace() callers
tracing either 32-bit or 64-bit tasks.  It behaves just like 32-bit.

Changing syscall_trace_enter() to return the syscall number shortens
all the assembly paths, while adding the SYSEMU feature in a simple way.

Signed-off-by: Roland McGrath <roland@redhat.com>

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This commit is contained in:

Roland McGrath 2008-07-09 02:38:07 -07:00

parent 64f0973319

commit d4d6715016

7 changed files with 88 additions and 132 deletions

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6

include/asm-x86/calling.h

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6

include/asm-x86/ptrace-abi.h

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17

include/asm-x86/thread_info.h

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