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authorUlrich Drepper <drepper@redhat.com>1998-07-27 17:52:05 +0000
committerUlrich Drepper <drepper@redhat.com>1998-07-27 17:52:05 +0000
commit7d39ca8849e77c1215279214acfdaf48f003f8f6 (patch)
tree6b619b9ec84fb24a54d3c753d9469adffa52bf28
parent67950c312ef1db84e050a17d4ffbc3fbf4c34e16 (diff)
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Improved profiling for ARM.
-rw-r--r--sysdeps/arm/machine-gmon.h42
1 files changed, 26 insertions, 16 deletions
diff --git a/sysdeps/arm/machine-gmon.h b/sysdeps/arm/machine-gmon.h
index 27643df884..96b4c13c72 100644
--- a/sysdeps/arm/machine-gmon.h
+++ b/sysdeps/arm/machine-gmon.h
@@ -1,5 +1,5 @@
/* Machine-dependent definitions for profiling support. ARM version.
- Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -37,19 +37,29 @@ static void mcount_internal (u_long frompc, u_long selfpc);
#define _MCOUNT_DECL(frompc, selfpc) \
static void mcount_internal (u_long frompc, u_long selfpc)
-#define MCOUNT \
-void _mcount (void) \
-{ \
- register unsigned long int frompc, selfpc; \
- __asm__("movs fp, fp; " \
- "moveq %0, $0; " \
- "ldrne %0, [fp, $-4]; " \
- "ldrne %1, [fp, $-12]; " \
- "movnes %1, %1; " \
- "ldrne %1, [%1, $-4]; " \
- : "=g" (selfpc), "=g" (frompc) \
- : : "cc" \
- ); \
- if (selfpc) \
- mcount_internal(frompc, selfpc); \
+/* This macro/func MUST save r0, r1 because the compiler inserts
+ blind calls to _mount(), ignoring the fact that _mcount may
+ clobber registers; therefore, _mcount may NOT clobber registers */
+/* if (this_fp!=0) {
+ r0 = this_lr
+ r1 = this_fp
+ r1 = [r1-4] which is caller's fp
+ if (r1!=0)
+ r1 = caller's lr
+ call mcount_internal(this_lr, caller's_lr)
+ }
+*/
+#define MCOUNT \
+void _mcount (void) \
+{ \
+ __asm__("stmdb sp!, {r0, r1, r2, r3};" \
+ "movs fp, fp;" \
+ "moveq r0, #0;" \
+ "ldrne r0, [fp, $-4];" \
+ "ldrne r1, [fp, $-12];" \
+ "movnes r1, r1;" \
+ "ldrne r1, [r1, $-4];" \
+ "movs r1, r1;" \
+ "blne mcount_internal;" \
+ "ldmia sp!, {r0, r1, r2, r3}"); \
}