powerpc/ftrace: Remove ftrace_32.S

Functions in ftrace_32.S are common with PPC64.

Reuse the ones defined for PPC64 with slight modification
when required.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/5e837fc190504c4ef834272e70d60ae33f175d49.1640017960.git.christophe.leroy@csgroup.eu

arch/powerpc/kernel/trace/Makefile

@@ -8,15 +8,14 @@ ifdef CONFIG_FUNCTION_TRACER
 CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
 endif
 
-obj32-$(CONFIG_FUNCTION_TRACER)		+= ftrace_32.o
-obj64-$(CONFIG_FUNCTION_TRACER)		+= ftrace_64.o
+obj32-$(CONFIG_FUNCTION_TRACER)		+= ftrace_mprofile.o
 ifdef CONFIG_MPROFILE_KERNEL
-obj64-$(CONFIG_FUNCTION_TRACER)		+= ftrace_64_mprofile.o
+obj64-$(CONFIG_FUNCTION_TRACER)		+= ftrace_mprofile.o
 else
 obj64-$(CONFIG_FUNCTION_TRACER)		+= ftrace_64_pg.o
 endif
 obj-$(CONFIG_DYNAMIC_FTRACE)		+= ftrace.o
-obj-$(CONFIG_FUNCTION_GRAPH_TRACER)	+= ftrace.o
+obj-$(CONFIG_FUNCTION_GRAPH_TRACER)	+= ftrace.o ftrace_low.o
 obj-$(CONFIG_FTRACE_SYSCALLS)		+= ftrace.o
 obj-$(CONFIG_TRACING)			+= trace_clock.o
 

arch/powerpc/kernel/trace/ftrace_64.S → arch/powerpc/kernel/trace/ftrace_low.S

@@ -10,6 +10,7 @@
 #include <asm/ppc-opcode.h>
 #include <asm/export.h>
 
+#ifdef CONFIG_PPC64
 .pushsection ".tramp.ftrace.text","aw",@progbits;
 .globl ftrace_tramp_text
 ftrace_tramp_text:
@@ -21,6 +22,7 @@ ftrace_tramp_text:
 ftrace_tramp_init:
 	.space 64
 .popsection
+#endif
 
 _GLOBAL(mcount)
 _GLOBAL(_mcount)
@@ -33,6 +35,7 @@ EXPORT_SYMBOL(_mcount)
 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
 _GLOBAL(return_to_handler)
 	/* need to save return values */
+#ifdef CONFIG_PPC64
 	std	r4,  -32(r1)
 	std	r3,  -24(r1)
 	/* save TOC */
@@ -46,18 +49,29 @@ _GLOBAL(return_to_handler)
 	 * Switch to our TOC to run inside the core kernel.
 	 */
 	ld	r2, PACATOC(r13)
+#else
+	stwu	r1, -16(r1)
+	stw	r3, 8(r1)
+	stw	r4, 12(r1)
+#endif
 
 	bl	ftrace_return_to_handler
 	nop
 
 	/* return value has real return address */
 	mtlr	r3
 
+#ifdef CONFIG_PPC64
 	ld	r1, 0(r1)
 	ld	r4,  -32(r1)
 	ld	r3,  -24(r1)
 	ld	r2,  -16(r1)
 	ld	r31, -8(r1)
+#else
+	lwz	r3, 8(r1)
+	lwz	r4, 12(r1)
+	addi	r1, r1, 16
+#endif
 
 	/* Jump back to real return address */
 	blr