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[patch] Alter syscall.brk and syscall.mremap to support IA64
- From: Lai Jiangshan <laijs at cn dot fujitsu dot com>
- To: systemtap at sourceware dot org
- Date: Tue, 18 Sep 2007 14:02:38 +0900
- Subject: [patch] Alter syscall.brk and syscall.mremap to support IA64
Hi, all
In the current tapset, kernel function sys_brk and sys_mremap are
used to probe syscall.brk and syscall.mremap. But on IA64, the entries
of syscall brk and mremap are actually ia64_brk and ia64_mremap, but not
sys_brk and sys_mremap. Though I think ia64's kernel function will be
finally changed to sys_brk and sys_mremap, it will be a long time so it
is inconvenient for users to probe these 2 syscalls on IA64. So I added
the probe points to syscall.brk and syscall.mremap for IA64 as following:
diff -Nur /usr/share/systemtap/tapset/syscalls.stp tapset/syscalls.stp
--- /usr/share/systemtap/tapset/syscalls.stp 2007-09-18 10:11:15.000000000 +0900
+++ tapset/syscalls.stp 2007-09-18 12:07:19.000000000 +0900
@@ -178,12 +178,14 @@
# brk ________________________________________________________
# unsigned long sys_brk(unsigned long brk)
-probe syscall.brk = kernel.function("sys_brk") {
+probe syscall.brk = kernel.function("sys_brk"),
+ kernel.function("ia64_brk") ? {
name = "brk"
brk = $brk
argstr = sprintf("%p", brk)
}
-probe syscall.brk.return = kernel.function("sys_brk").return {
+probe syscall.brk.return = kernel.function("sys_brk").return,
+ kernel.function("ia64_brk").return ? {
name = "brk"
retstr = returnstr(1)
}
@@ -2546,7 +2548,8 @@
# unsigned long flags,
# unsigned long new_addr)
#
-probe syscall.mremap = kernel.function("sys_mremap") {
+probe syscall.mremap = kernel.function("sys_mremap"),
+ kernel.function("ia64_mremap") ? {
name = "mremap"
old_address = $addr
old_size = $old_len
@@ -2556,7 +2559,8 @@
argstr = sprintf("%p, %d, %d, %s, %p", $addr, $old_len, $new_len,
_mmap_flags($flags), $new_addr)
}
-probe syscall.mremap.return = kernel.function("sys_mremap").return {
+probe syscall.mremap.return = kernel.function("sys_mremap").return,
+ kernel.function("ia64_mremap").return ? {
name = "mremap"
retstr = returnstr(2)
}