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[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)
}




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