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authorRusty Lynch <rusty.lynch@intel.com>2005-06-27 15:17:15 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-27 15:23:53 -0700
commit97f7943d70ff0e1e92ea627c44cfacfdae65dbc4 (patch)
treee2a042a3bb5014ee98551bd5d42dc3b21a42e1ec /include
parent9508dbfe39112813612085c00d55bacd398eddc6 (diff)
downloadlinux-stericsson-97f7943d70ff0e1e92ea627c44cfacfdae65dbc4.tar.gz
[PATCH] Return probe redesign: ppc64 specific implementation
The following is a patch provided by Ananth Mavinakayanahalli that implements the new PPC64 specific parts of the new function return probe design. NOTE: Since getting Ananth's patch, I changed trampoline_probe_handler() to consume each of the outstanding return probem instances (feedback on my original RFC after Ananth cut a patch), and also added the arch_init() function (adding arch specific initialization.) I have cross compiled but have not testing this on a PPC64 machine. Changes include: * Addition of kretprobe_trampoline to act as a dummy function for instrumented functions to return to, and for the return probe infrastructure to place a kprobe on on, gaining control so that the return probe handler can be called, and so that the instruction pointer can be moved back to the original return address. * Addition of arch_init(), allowing a kprobe to be registered on kretprobe_trampoline * Addition of trampoline_probe_handler() which is used as the pre_handler for the kprobe inserted on kretprobe_implementation. This is the function that handles the details for calling the return probe handler function and returning control back at the original return address * Addition of arch_prepare_kretprobe() which is setup as the pre_handler for a kprobe registered at the beginning of the target function by kernel/kprobes.c so that a return probe instance can be setup when a caller enters the target function. (A return probe instance contains all the needed information for trampoline_probe_handler to do it's job.) * Hooks added to the exit path of a task so that we can cleanup any left-over return probe instances (i.e. if a task dies while inside a targeted function then the return probe instance was reserved at the beginning of the function but the function never returns so we need to mark the instance as unused.) Signed-off-by: Rusty Lynch <rusty.lynch@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-ppc64/kprobes.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-ppc64/kprobes.h b/include/asm-ppc64/kprobes.h
index 790cf7c52774..0802919c3235 100644
--- a/include/asm-ppc64/kprobes.h
+++ b/include/asm-ppc64/kprobes.h
@@ -42,6 +42,9 @@ typedef unsigned int kprobe_opcode_t;
#define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)((func_descr_t *)pentry)
+#define ARCH_SUPPORTS_KRETPROBES
+void kretprobe_trampoline(void);
+
/* Architecture specific copy of original instruction */
struct arch_specific_insn {
/* copy of original instruction */