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[Bug runtime/12781] New: task_finder __stp_utrace_task_finder_target_syscall_entry code a bit fat
- From: "fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Wed, 18 May 2011 19:04:16 +0000
- Subject: [Bug runtime/12781] New: task_finder __stp_utrace_task_finder_target_syscall_entry code a bit fat
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=12781
Summary: task_finder
__stp_utrace_task_finder_target_syscall_entry code a
bit fat
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: runtime
AssignedTo: systemtap@sourceware.org
ReportedBy: fche@redhat.com
>From http://pastebin.com/rVPh7w5V, the code sequence for testing the
syscall number for one of the interesting ones (mmap et al.) is rather
wordy. The list of syscall numbers should be precomputed or inlined
so that not so many test_ti_thread_flag calls are necessary.
#
if (syscall_no != MMAP_SYSCALL_NO(tsk)
#
51cb: 83 f8 01 cmp $0x1,%eax
#
51ce: 48 19 c0 sbb %rax,%rax
#
51d1: 48 83 e0 af and $0xffffffffffffffaf,%rax
#
51d5: 48 83 c0 5a add $0x5a,%rax
#
51d9: 49 39 c4 cmp %rax,%r12
#
51dc: 74 66 je 5244
<__stp_utrace_task_finder_target_syscall_entry+0xd9>
#
51de: 48 8b 7b 08 mov 0x8(%rbx),%rdi
#
51e2: be 11 00 00 00 mov $0x11,%esi
#
51e7: e8 3e c2 ff ff callq 142a <test_ti_thread_flag>
#
&& syscall_no != MMAP2_SYSCALL_NO(tsk)
#
51ec: 83 f8 01 cmp $0x1,%eax
#
51ef: 48 19 c0 sbb %rax,%rax
#
51f2: 0c c0 or $0xc0,%al
#
51f4: 49 39 c4 cmp %rax,%r12
#
51f7: 74 4b je 5244
<__stp_utrace_task_finder_target_syscall_entry+0xd9>
#
51f9: 48 8b 7b 08 mov 0x8(%rbx),%rdi
#
51fd: be 11 00 00 00 mov $0x11,%esi
#
5202: e8 23 c2 ff ff callq 142a <test_ti_thread_flag>
#
&& syscall_no != MPROTECT_SYSCALL_NO(tsk)
#
5207: 83 f8 01 cmp $0x1,%eax
#
520a: 48 19 c0 sbb %rax,%rax
#
520d: 48 83 e0 8d and $0xffffffffffffff8d,%rax
#
5211: 48 83 c0 7d add $0x7d,%rax
#
5215: 49 39 c4 cmp %rax,%r12
#
5218: 74 2a je 5244
<__stp_utrace_task_finder_target_syscall_entry+0xd9>
#
521a: 48 8b 7b 08 mov 0x8(%rbx),%rdi
#
521e: be 11 00 00 00 mov $0x11,%esi
#
5223: e8 02 c2 ff ff callq 142a <test_ti_thread_flag>
#
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