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authorYi Li <yi.li@analog.com>2009-09-15 09:24:31 +0000
committerMike Frysinger <vapier@gentoo.org>2009-09-16 22:10:52 -0400
commit5bf9cbef9972f851172391a37261b12bba63f733 (patch)
tree6ca84de9aea486b563c53a0a9f9be0950f74c990 /arch
parent3b67d91b3e2c789952379f5157704c2162330492 (diff)
Blackfin: update ftrace for latest toolchain
The mcount support that was finally added to the Blackfin gcc port isn't exactly the same as what ftrace was developed against. Now that the final gcc version is in place, update the ftrace code to match. While updating this, fix the swapped arguments to the tracer (signature is (ip, parent_ip) while we were passing (parent_ip, ip)). Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/blackfin/include/asm/ftrace.h2
-rw-r--r--arch/blackfin/kernel/ftrace-entry.S23
2 files changed, 13 insertions, 12 deletions
diff --git a/arch/blackfin/include/asm/ftrace.h b/arch/blackfin/include/asm/ftrace.h
index 8643680f0f7..90c9b400ba6 100644
--- a/arch/blackfin/include/asm/ftrace.h
+++ b/arch/blackfin/include/asm/ftrace.h
@@ -8,6 +8,6 @@
#ifndef __ASM_BFIN_FTRACE_H__
#define __ASM_BFIN_FTRACE_H__
-#define MCOUNT_INSN_SIZE 8 /* sizeof mcount call: LINK + CALL */
+#define MCOUNT_INSN_SIZE 6 /* sizeof "[++sp] = rets; call __mcount;" */
#endif
diff --git a/arch/blackfin/kernel/ftrace-entry.S b/arch/blackfin/kernel/ftrace-entry.S
index 6980b7a0615..76dd4fbcd17 100644
--- a/arch/blackfin/kernel/ftrace-entry.S
+++ b/arch/blackfin/kernel/ftrace-entry.S
@@ -17,8 +17,8 @@
* only one we can blow away. With pointer registers, we have P0-P2.
*
* Upon entry, the RETS will point to the top of the current profiled
- * function. And since GCC setup the frame for us, the previous function
- * will be waiting there. mmmm pie.
+ * function. And since GCC pushed the previous RETS for us, the previous
+ * function will be waiting there. mmmm pie.
*/
ENTRY(__mcount)
/* save third function arg early so we can do testing below */
@@ -70,14 +70,14 @@ ENTRY(__mcount)
/* setup the tracer function */
p0 = r3;
- /* tracer(ulong frompc, ulong selfpc):
- * frompc: the pc that did the call to ...
- * selfpc: ... this location
- * the selfpc itself will need adjusting for the mcount call
+ /* function_trace_call(unsigned long ip, unsigned long parent_ip):
+ * ip: this point was called by ...
+ * parent_ip: ... this function
+ * the ip itself will need adjusting for the mcount call
*/
- r1 = rets;
- r0 = [fp + 4];
- r1 += -MCOUNT_INSN_SIZE;
+ r0 = rets;
+ r1 = [sp + 16]; /* skip the 4 local regs on stack */
+ r0 += -MCOUNT_INSN_SIZE;
/* call the tracer */
call (p0);
@@ -106,9 +106,10 @@ ENTRY(_ftrace_graph_caller)
[--sp] = r1;
[--sp] = rets;
- r0 = fp;
+ /* prepare_ftrace_return(unsigned long *parent, unsigned long self_addr) */
+ r0 = sp;
r1 = rets;
- r0 += 4;
+ r0 += 16; /* skip the 4 local regs on stack */
r1 += -MCOUNT_INSN_SIZE;
call _prepare_ftrace_return;